Patent Publication Number: US-8523214-B2

Title: Mobile rocking patient chair and method of use

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Application No. 61/487,113, filed on May 17, 2011, the prior application being herewith incorporated by reference in its entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates generally to wheeled, movable chairs, and, more particularly, relates to a movable chair with rocking and other capabilities. 
     BACKGROUND OF THE INVENTION 
     Although rocking is a part of virtually every human&#39;s childhood, much more often than not, it becomes an infrequent activity in the adult years. This is largely due to the fact that few people are aware of the myriad benefits conveyed by the rocking movement on the body. 
     Historically, rocking chairs have been a considered a treasured piece of furniture. Originating in England, by the 1700s, rocky chairs had become an American phenomenon. A common and functional piece of furniture, rocking chairs were used in virtually every home. In addition to soothing emotional wounds and providing comfort in times of illness, rocking chairs were widely accepted as a cradling device, ensuring the emotional bond between mother and child. 
     Through scientific research and case studies, today, society is discovering the therapeutic and life-changing effects rocking chairs have on psychosocial well-being, among other types. The use of rocking chairs has spread far beyond the mother/child cradle—they are now considered a cure for a wide range of health problems. 
     Studies have shown that the gentle motion of a rocking chair releases endorphins; a chemical known to improve mood and lessen pain. The study confirms that rocking chair therapy increases the quality of life for people suffering from Dementia and Alzheimer&#39;s disease. Studies further show that the calming movement of a rocking chair can dramatically speed up the healing process in severely ill patients. Not surprisingly, rocking chairs are now being used as therapy for post-surgery recovery. 
     Unlike other pieces of furniture and medical devices, rocking chairs provide a place for rest and relaxation with both psychological and physical benefits. They have been scientifically proven to be of benefit for many medical conditions. By working the muscles and tendons of the thighs, lower legs and ankles, studies have revealed that rocking chairs provide light to moderate exercise, even for those with limited mobility. They contribute to fitness and assist in maintaining or losing weight. Only five to ten minutes of rocking per day can reduce blood pressure and improve circulation. Rocking chairs have also been shown to reduce the impact of diseases such as arthritis, assist in the promotion of prenatal nervous system development, progress healing after surgery, positively impact the immune system, and improve the quality of living by rejuvenating the mind. 
     Some studies indicate that rocking has been linked to improved cognitive conditions such as Alzheimer&#39;s disease, and sensory disorders including autism. Researchers believe that the motion of rocking satisfies the autistic individual&#39;s need to keep moving, while allowing them to concentrate and study. 
     Rocking Chair Therapy appears to ease health problems, and it has been applied and proven beneficial to at least the following conditions:
         1. Abdominal hysterectomy pain: Rocking chairs have been proven helpful for people with abdominal hysterectomy pain. Studies have suggested that the back and forth motion of rocking helps relieve intestinal gas buildup and abdominal distension. Researchers have hypothesized that the rhythmic repetitive motion of rocking stimulates the vestibular nerves and has a modulating effect on the stress response.   2. Anxiety and depression: It has been reported that the act of rocking improves anxiety and depression in people suffering from Alzheimer, dementia, ADHD, Autism and sensory disorders. Rocking chair therapy has also been shown to have a positive effect on the emotional well-being of dementia patients in nursing homes. In addition to reducing anxiety, depression and medication consumption, patients&#39; balance tends to improve, resulting in fewer subsequent falls and related injuries.   3. Arthritis: Experts highly recommend the use of rocking chairs. According to studies, rocking is relaxing and can improve strength and flexibility, especially in a person&#39;s knees.   4. Back pain: President John F. Kennedy is often credited for the worldwide acceptance of rocking chair therapy. After being diagnosed and suffering from extreme back pain, Kennedy&#39;s physician prescribed him a rocking chair. Amazed by the healing effects of the rocker, Kennedy insisted that the chair accompany him to the White House after his presidential election. Over the years, Kennedy had at least 14 rocking chairs, some of which were kept in the most exclusive locations including, the Oval Office, his bedroom at the White House, a suite at the New York Carlyle&#39;s Hotel, and Air Force One. Today, research studies have confirmed that rocking chairs block pain impulses, relax the muscles in the lower back, and ease lower back pain.   5. Blood pressure: In a pilot study of men and women over 55 who often suffer from lower blood pressure and low blood return to the brain, 30 min of steady rocking led to an average 12 mmHg increase in systolic blood pressure and a 3.6 average increase in diastolic blood pressure. Rocking tends to increase blood pressure, which in turn helps get blood to the brain.   6. Cardio vascular issues: Rocking chairs are an excellent source for cardio vascular training. To improve upper body training, accessories or training devices can be attached to the chairs.   7. Children with ADHD and other disorders: There is gathering anecdotal evidence for the benefits of allowing children with Attention Deficit Hyperactivity Disorder to use a rocking chair while reading. ADHD cases appear to be able to concentrate better when rocking chair therapy is used. It is believed that the rocking motion gives an outlet to excess energy.   8. Chronic fatigue, stroke and heart attack: Rocking in a rocking chair has been proven beneficial for chronic fatigue, stroke and heart attack victims.   9. Fragile X syndrome: Fragile X is a family of genetic conditions which impacts individuals and families in different ways. Fragile X Syndrome is the most common form of inherited mental impairment and is sometimes referred to as mental retardation. Sensory impairment or sensory processing difficulties are often a part of the puzzle. Rocking in a rocking chair is a recommended part of the therapy, cited for its calming effects.   10. Sensory integration therapy: SIT is a theory used by occupational therapists and has been applied to autism learning disabilities, attention problems, and developmental problems including Fragile X. Rocking in a rocking chair is one of the calming activities that is recommended. The late A. Jean Ayres, PhD. developed the theory and practice of sensory integration. She believed every autistic child should have a rocker in his room.   11. Sleep: For children, rocking chairs assist in getting them to sleep and reduce the odds of apnea and Sudden Infant Death Syndrome (SIDS). For adults, it is believed that rocking chairs release tension, similarly aiding them in sleep.   12. Strength and flexibility: According to the results of study groups, strength and flexibility increase in patients who use rocking chairs as a form of therapy.   13. Surgical healing process: A recent study found that short periods of regular rocking chair therapy speed recovery from bowel dysfunction, a common side effect of abdominal surgery for colon, small bowel, pancreatic and liver cancers. Patients who spent time rocking in a rocking chair resumed bowel activity more quickly than patients who did not, which meant they felt better sooner and recovered faster.
           Rocking in a Rocking Chair has also been proven helpful for women after a C-section. One study found that rocking mothers who had cesarean sections had less gas pains, walked faster, and left the hospital one day sooner than non-rocking mothers. This could explain why rockers are a standard in maternity wards today.   
           14. Stuttering: Rocking chairs are recommended for children who stutter. The distracting rhythm works on vestibular function.   15. Varicose veins: Rocking chairs have been linked to the prevention and cure of varicose veins. According to the research, rocking stimulates circulation and improves muscle tone, thereby reducing and preventing the development of varicose veins.   16. Weight loss: Rocking chairs have proven to be successful in the maintenance and reduction of weight. In fact, rocking in a rocking chair burns approximately 150 calories per hour.       

     Unfortunately, at a time when people need rocking the most—when they are immobilized—they are deprived of the ability to rock. For example, when persons reach an advanced age, they are often times confined to a wheel chair and are unable to rock. Once such improvement to the art is described in U.S. Pat. No. 4,707,026, which was issued to one of the co-inventors of the instant application, the entire disclosure of which is incorporated herein by reference. The device described in U.S. Pat. No. 4,707,026 however lacks several important features that render a mobile patient rocking chair suitable for everyday use. 
     Therefore, a need exists to overcome the problems with the prior art as discussed above. 
     SUMMARY OF THE INVENTION 
     The invention provides a mobile rocking patient chair and method of use that overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices and methods of this general type and that allows a patient to be mobile and enjoy the ability to rock in a rocking chair. 
     With the foregoing and other objects in view, there is provided, in accordance with the invention, a patient chair that includes a seat portion and an undercarriage coupled to and supporting the seat portion, where the undercarriage includes a frame, a rocking mechanism coupling the seat portion to the frame, a selectively pivotable pivot arm coupled to the frame, and at least one wheelchair-type wheel selectively couplable to the pivotable pivot arm. 
     In accordance with another feature, an embodiment of the present invention includes a set of wheels coupled to the frame that operable to reduce friction between the frame and a flooring surface upon which the patient chair is supported. In other words, the wheels allow the frame to glide across the floor. 
     In accordance with a further feature of the present invention, the set of wheels provides mobility and stability to the patient chair independent of a coupled/decoupled state of the wheelchair-type wheels. 
     In accordance with a further feature of the present invention, the pivot arm further includes a wheel-coupling end, a pivot-arm manipulating end, and a pivot point located between the wheel-coupling end and the pivot-arm manipulating end. 
     In accordance with yet another feature of the present invention, a bias member biases the wheel-coupling end of the pivot arm in a downward direction. 
     In accordance with an additional feature of the present invention, the pivot arm is arranged on the frame so that movement of the pivot-arm manipulating end moves a wheelchair-type wheel coupled to the wheel-coupling end in a direction away from a surface upon which the patient chair is supported. 
     In accordance with one more feature of the present invention, the wheelchair-type wheel is coupled to the pivot arm with a quick couple. 
     In accordance with additional embodiments of the present invention, there is further provided, a patient chair that includes a seat portion and an undercarriage supporting the seat portion, where the undercarriage includes a set of at least three wheels providing mobility to the patient chair, a left wheelchair-type wheel coupling member, a right wheelchair-type wheel coupling member, and a lever operable to move at least one of the left wheelchair-type wheel coupling member and the right wheelchair-type wheel coupling member away from a flooring surface upon which the patient chair is supported. 
     In accordance with a further feature of the present invention, the lever is a selectively pivotable pivot arm that is activatable by a user&#39;s foot. 
     In accordance with another feature, the lever also includes a wheel-coupling end, a pivot-arm manipulating end, and a pivot point located between the wheel-coupling end and the pivot-arm manipulating end. 
     In accordance with yet another feature, an embodiment of the present invention includes a bias member biasing the wheel-coupling end of the pivot arm in a downward direction. 
     In accordance with the present invention, a method of transferring a patient includes providing a mobile patient chair that has a seat portion and an undercarriage supporting the seat portion, where the undercarriage has a set of at least three wheels providing mobility to the patient chair, a left wheelchair-type wheel coupling member, a right wheelchair-type wheel coupling member, and a lever operable to move at least one of the left wheelchair-type wheel coupling member and the right wheelchair-type wheel coupling member away from a flooring surface upon which the patient chair is supported. The method further includes manipulating the lever in a first direction, coupling at least a first wheelchair-type wheel to at least one of the left wheelchair-type wheel coupling member and the right wheelchair-type wheel coupling member of the mobile patient chair, manipulating the lever in a second direction, and manipulating the coupled wheelchair-type wheel to cause the mobile patient chair to move. 
     In accordance with yet another feature, an embodiment of the present invention includes the step of maneuvering the mobile patient chair to a first position adjacent a target patient delivery location, manipulating the lever in the first direction, decoupling one of the first wheelchair-type wheel and the second wheelchair-type wheel from its respective wheel coupling member, maneuvering the mobile patient chair to a second position adjacent the target patient delivery location, the second position closer to the target patient delivery location than the first position, and transferring a patient from the seat portion to the target patient delivery location. 
     In accordance with still another feature, the step of transferring the patient includes moving the patient sideways relative to the seat, i.e., over a location of the respective wheel coupling member. 
     In accordance with still another feature, the method includes pressing down on the lever with a user&#39;s foot to manipulate the lever in the first direction. 
     In accordance with still another feature, a bias member biases the lever in the second direction. 
     In accordance with additional embodiments of the present invention, a mobile patient chair and method of transferring a patient include providing a mobile patient chair with a seat portion and an undercarriage supporting the seat portion, where the undercarriage includes a set of four wheels providing mobility to the patient chair, a left wheelchair-type wheel coupling member, a right wheelchair-type wheel coupling member, and a pair of levers operable to move the wheelchair-type wheel coupling members away from a flooring surface upon which the patient chair is supported. The method includes manipulating each of the levers in a first direction, coupling wheelchair-type wheels to the wheelchair-type wheel coupling members, manipulating the levers in a second direction, and manipulating the coupled wheelchair-type wheel to cause the mobile patient chair to move. 
     With the foregoing and other objects in view, there is provided, in accordance with the invention, a mobile patient chair having a seat portion and an undercarriage coupled to and supporting the seat portion, where the undercarriage includes a frame having at least one selectively rolling wheel, a rocking mechanism coupling the seat portion to the frame and operable to move the seat in a substantially forward and backward translating movement relative to the frame, and a lockout ember having a first position that prevents a rolling ability of the at least one selectively roiling wheel and does not prevent the rocking mechanism from the substantially forward and backward translating movement relative to the frame and a second position that does not inhibit the rolling ability of the at least one selectively roiling wheel and does prevent the rocking mechanism from the substantially forward and backward translating movement relative to the frame. 
     In accordance with a further feature of the present invention, the first position and the second position of the lockout member are selectable by activation of a single lever, which can be a two-position foot pedal. 
     In accordance with another feature of the present invention, the at least one selectively roiling wheel is a set of four wheels operable to reduce friction between the frame and a flooring surface upon which the mobile patient chair is supported. 
     In accordance with yet another feature of the present invention, the first position of the lockout member also prevents a steering ability of the at least one selectively rolling wheel. 
     In accordance with an additional feature of the present invention, the rocking mechanism includes a lockout plate defining an aperture and the lockout member has an engagement member shaped to fit within the aperture when the lockout member is in the second position. 
     In accordance with yet one more feature, an embodiment of the present invention includes a frame bar coupled to the at least one selectively rolling wheel and to the lockout member, wherein an axial rotation of the frame bar moves the lockout member between the first position and the second position. 
     In accordance with a further feature, an embodiment of the present invention includes a foot activatable lever coupled to the frame bar and operable to cause the axial rotation of the frame bar in response to receiving a force from a foot. 
     In accordance with additional embodiments of the present invention, there is further provided, a patient chair that includes a seat portion and an undercarriage coupled to and supporting the seat portion, where the undercarriage includes a frame having a set of rollers and a rocking mechanism coupling the seat portion to the frame. The chair has a rolling mode, whereby the set of rollers rotate and allow the mobile patient chair to move from a first location to a second location and a rocking mode, whereby the rocking mechanism is operable to move the seat in a substantially forward and backward translating movement relative to the frame. A lockout ember renders the rolling mode and the rocking mode mutually exclusive. 
     In accordance with yet another feature of the present invention, the lockout member has a first position that prevents a rolling ability of the set of rollers and does not prevent the rocking mechanism from the substantially forward and backward translating movement relative to the frame and a second position that does not inhibit the rolling ability of the set of rollers and does prevent the rocking mechanism from the substantially forward and backward translating movement relative to the frame. 
     In accordance with yet one more feature, an embodiment of the present invention includes a frame bar coupled to at least one of the set of rollers and to the lockout member, wherein an axial rotation of the frame bar moves the lockout member between the first position and the second position. 
     In accordance with a further feature of the present invention, a foot activatable lever is coupled to the frame bar and operable to cause the axial rotation of the frame bar in response to receiving a force from a foot. 
     In accordance with additional embodiments of the present invention, there is further provided, a method for selecting between nodes of a mobile patient rocking chair that includes the step of providing a mobile patient rocking chair that includes a seat portion and an undercarriage coupled to and supporting the seat portion, the undercarriage having a frame having a set of rollers and a rocking mechanism coupling the seat portion to the frame. The method also includes the step of selecting between a rolling mode, whereby the set of rollers rotate and allow the mobile patient rocking chair to move from a first location to a second location and a rocking mode, whereby the rocking mechanism is operable to move the seat in a substantially forward and backward translating movement relative to the frame by activation of a single member, whereby the roiling mode and the rocking mode are mutually exclusive. 
     In accordance with an additional feature of the present invention, the selecting between the rolling mode and the rocking mode is performed by providing a force from a user&#39;s foot. 
     With the foregoing and other objects in view, there is provided, in accordance with the invention, a mobile patient chair includes a seat portion, an undercarriage coupled to and supporting the seat portion, where the undercarriage includes a frame, a rocking mechanism coupling the seat portion to the frame and movable relative to the frame, and a set of wheels coupled to the frame, and the chair further includes a set of exercise handles mechanically coupled to the frame and shaped so that a person seated in the chair can grasp the handles and cause the chair to translate back and forth relative to the frame. 
     In accordance with a further feature of the present invention, the set of wheels are operable to reduce friction between the frame and a flooring surface upon which the mobile chair is supported. 
     In accordance with yet another feature of the present invention, the exercise handles are selectively couplable to the frame at a plurality of selectable angles. 
     In accordance with an additional feature of the present invention, wherein the set of exercise handles further comprise a grasping end, a frame-coupling end opposite the grasping end, and a set of teeth at the frame-coupling end, wherein the plurality of angles are selectable by aligning the set of teeth with features of the frame. 
     In accordance with a further feature of the present invention, the features of the frame is a set of teeth shaped to correspond with the set of teeth of the exercise handles. 
     In accordance with another feature, the set of exercise handles is two separate handles. 
     In accordance with another feature, an embodiment of the present invention includes a set of set keys removably coupling the exercise handles to the frame. 
     In accordance with additional embodiments of the present invention, there is further provided, a mobile chair that comprises a frame, a set of rolling wheels coupled to the frame, a seat portion mechanically coupled to the frame and movable in a back and forth motion, relative to the frame, and at least one exercise handle mechanically coupled to the frame and providing an occupant of the seat a means for moving the seat in the back and forth motion relative to the frame and the wheels. 
     In accordance with still another feature, method for exercising in a chair includes providing a mobile chair that includes a seat portion, an undercarriage coupled to and supporting the seat portion, where the undercarriage includes a frame, a rocking mechanism coupling the seat portion to the frame and movable relative to the frame, and a set of rolling wheels coupled to the frame, and at least one exercise handle mechanically coupled to the frame and shaped to extend above a lower portion of the seat portion. The method further includes sitting in the seat portion and applying a sufficient force to the at least one handle to cause the seat portion to move in a substantially lateral direction relative to the frame. 
     In accordance with a further feature of the present invention, the method also includes coupling a coupling portion of the at least one exercise handle to the frame in a first position, at least partially decoupling the coupling portion of the at least one exercise handle from the frame, rotating the at least one exercise handle relative to the frame, coupling the coupling portion of the at least one exercise handle to the frame in a second position different from the first position, and securing the coupling portion to the frame in the second position by manipulating a securing member, e.g., a set key. 
     In accordance with another feature of the present invention, the method includes securing the coupling portion to the frame in the first position by manipulating a set key. 
     In accordance with other embodiments of the present invention, there is further provided, a mobile chair and method for exercising in the chair include a mobile chair that includes a seat portion, an undercarriage coupled to and supporting the seat portion, the undercarriage including a frame, a rocking mechanism coupling the seat portion to the frame and movable relative to the frame, and a set of rolling wheels coupled to the frame, and at least one exercise handle mechanically coupled to the frame and shaped to extend above a lower portion of the seat portion. The method includes sitting in the seat portion and applying a sufficient force to the at least one handle to cause the seat portion to move in a substantially lateral direction relative to the frame. 
     Although the invention is illustrated and described herein as embodied in a mobile rocking patient chair, it is, nevertheless, not intended to be limited to the details shown because various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. Additionally, well-known elements of exemplary embodiments of the invention will not be described in detail or will be omitted so as not to obscure the relevant details of the invention. 
     Other features that are considered as characteristic for the invention are set forth in the appended claims. As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting; but rather, to provide an understandable description of the invention. While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the drawing figures, in which like reference numerals are carried forward. The figures of the drawings are not drawn to scale. 
     Before the present invention is disclosed and described, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The terms “a” or “an,” as used herein, are defined as one or more than one. The term “plurality,” as used herein, is defined as two or more than two. The term “another,” as used herein, is defined as at least a second or more. The terms “including” and/or “having,” as used herein, are defined as comprising (i.e., open language). The term “coupled,” as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically. 
     As used herein, the terms “about” or “approximately” apply to all numeric values, whether or not explicitly indicated. These terms generally refer to a range of numbers that one of skill in the art would consider equivalent to the recited values (i.e., having the same function or result). In many instances these terms may include numbers that are rounded to the nearest significant figure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying figures, where like reference numerals refer to identical or functionally similar elements throughout the separate views and which together with the detailed description below are incorporated in and form part of the specification, serve to further illustrate various embodiments and explain various principles and advantages all in accordance with the present invention. 
         FIG. 1  is a left-side perspective view of a mobile patient rocking chair assembly showing removable cushion inserts in accordance with the present invention; 
         FIG. 2  is a left-side perspective view of the mobile patient rocking chair assembly of  FIG. 1  showing removable exercise handles and armrests in accordance with the present invention; 
         FIG. 3  is a left-side perspective view of the mobile patient rocking chair assembly of  FIG. 1  showing concealable patient transfer mats and exercise handles in accordance with the present invention; 
         FIG. 4  is a rear-facing perspective view of the mobile patient rocking chair assembly of  FIG. 1  showing a storage container holding the patient transfer mats in accordance with the present invention; 
         FIG. 5  is a fragmentary, side perspective view of the undercarriage of the mobile patient rocking chair assembly of  FIG. 1 ; 
         FIG. 6  is a left front perspective view of the undercarriage of the mobile patient rocking chair assembly of  FIG. 1 ; 
         FIG. 7  is an exploded perspective view of a coupling connector in accordance with the present invention; 
         FIG. 8  is a rear-facing fragmentary perspective view of a resistance-producing member coupled to the undercarriage of the mobile patient rocking chair assembly in accordance with the present invention; 
         FIG. 9  is an elevational side view of the resistance-producing member of  FIG. 9 ; 
         FIG. 10  is an elevational side view of the mobile patient rocking chair assembly of  FIG. 1  with a push handle and an electric motor that is able to propel the chair assembly as well as prevent rocking movement while the chair assembly is in motion in accordance with the present invention; 
         FIG. 11  is an elevational side view of the mobile patient rocking chair assembly of  FIG. 1  with an adjustable back portion of the chair in accordance with the present invention; 
         FIG. 12  is a perspective right rear view of the mobile patient rocking chair assembly of  FIG. 1  with a wheelchair wheel aligned with an axle in accordance with the present invention; 
         FIG. 13  is a perspective right rear view of the mobile patient rocking chair assembly of  FIG. 1  with a wheelchair wheel installed on an axle in accordance with the present invention; 
         FIG. 14  is a perspective left-side view of a mobile patient rocking chair assembly having a food tray and food tray support bar that converts to a push handle as well as a mechanism that prevents rocking movement when the wheels are not in a locked position in accordance with the present invention; 
         FIG. 15  is a perspective downward-looking front view of an undercarriage having a frame and rocking mechanism with the chair removed and exercise handles partially installed in accordance with the present invention; 
         FIG. 16  is a close-up partial perspective downward-looking front view of the partially-installed exercise handles of  FIG. 15 ; 
         FIG. 17  is a perspective downward-looking left rear view of a mobile patient rocking chair assembly with a rear frame bar that controls a lockout bar that prevents the chair of the mobile patient rocking chair assembly from rocking relative to the frame in accordance with the present invention; 
         FIG. 18  is a perspective downward-looking right rear view of the mobile patient rocking chair assembly of  FIG. 17 ; 
         FIG. 19  is a perspective downward-looking right rear view of the mobile patient rocking chair assembly of  FIG. 18  with the chair portion removed; 
         FIG. 20  is a perspective downward looking close-up partial right rear view of the undercarriage of the mobile patient rocking chair assembly of  FIG. 17 ; 
         FIG. 21  is a perspective view of two wheelchair wheels coupled to pivot arms through quick connect couplers in accordance with the present invention; 
         FIG. 22  is a downward-looking left rear view of the mobile patient rocking chair assembly of  FIG. 17  with the chair removed to show the wheelchair wheel coupling pivot arms coupled to the frame of the undercarriage as well as a frame plate and handle for coupling the rocking mechanism to the frame in accordance with the present invention; 
         FIG. 23  is a process flow diagram illustrating a method of attaching and removing wheel chair wheels from a mobile patient rocking chair assembly; 
         FIG. 24  is an elevational left side view of a mobile patient chair assembly in an upright position in accordance with the present invention; 
         FIG. 25  is an elevational left side view of the mobile patient chair assembly of  FIG. 24  in a partially reclined position; 
         FIG. 26  is an elevational left side view of the mobile patient chair assembly of  FIG. 24  in a fully reclined position; 
         FIG. 27  is an elevational left side view of a mobile patient rocking chair assembly with a left wheelchair wheel coupled to a pivot arm that is attached to the frame of the mobile patient rocking chair assembly in accordance with the present invention; 
         FIG. 28  is a perspective left rear view of the mobile patient chair assembly of  FIG. 24  and illustrates an actuator for selecting a decline angle of the chair and foot levers that manipulate a frame bar to lock one or more of the casters upon which the mobile patient chair assembly receives movement capabilities in accordance with the present invention; 
         FIG. 29  is a perspective close-up partial front view of the mobile patient chair assembly of  FIG. 24 ; 
         FIG. 30  is an elevational rear view of the mobile patient chair assembly of  FIG. 24 ; and 
         FIG. 31  is a perspective left front view of the mobile patient chair assembly of  FIG. 24 . 
     
    
    
     DETAILED DESCRIPTION 
     While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the drawing figures, in which like reference numerals are carried forward. It is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. 
     The present invention provides a novel mobile patient chair that allows the seated person to rock back and forth. Embodiments of the invention provide the ability to quickly and easily transfer the seated person from the novel chair to an adjacent surface. In addition, embodiments of the invention provide various rocking features that result in exercise for the seated person during the rocking motion. Further, embodiments of the invention provide removable cushion inserts that provide comfort and ease of cleaning while maintaining durability of the surrounding seat surfaces. 
     Referring now to  FIG. 1 , one embodiment of the present invention is shown in a perspective view.  FIG. 1  shows several advantageous features of the present invention, but, as will be described below, the invention can be provided in several shapes, sizes, combinations of features and components, and varying numbers and functions of the components. 
     The first example of a mobile patient rocking chair assembly  100 , as shown in  FIG. 1 , includes an undercarriage  102  that supports a chair  106  on top and features a set of wheels  104   a - d  below that provide mobility to the undercarriage  102 . The chair  106  is used to support a person when placed in the inventive patient rocking chair assembly  100 . Although four wheels are shown, the invention is not no limited and can utilize any number of wheels, rollers, casters, and other elements to provide mobility. 
     The chair  106  also includes a seat portion  108  and a back portion  110 . The seat portion  108  supports the lower portion of a person&#39;s body and the back portion  110  supports the upper portion of a person&#39;s body. As is shown in  FIG. 1 , the chair  106  is formed, although not necessarily, in an ergonomic shape that conforms to the contours of a user&#39;s body when the user is sitting in the chair  106 . The chair however, is not required to have such a shape and any chair that supports a person&#39;s body is within the spirit and scope of the present invention. 
     Removable Inserts 
     It is envisioned that the mobile patient rocking chair assembly  100  will be used, at times, by those suffering from issues of incontinence. When an episode of incontinence occurs, the chair in which the user is seated can come into contact with the moisture. For this reason, easy cleaning of the chair  106  is desired. To facilitate easy cleaning, many prior-art patient chairs wrapped foam or some other pillow-type material with an easy-to-clean material, such as leather, Naugahyde, vinyl or other similar materials. However, these materials do not “breathe,” i.e., allow air to circulate, and quickly become hot and uncomfortable to sit on. On the other hand, cloth materials, which provide improved air circulation, allow moisture to soak in and are not desirable for chairs used by people suffering from incontinence. 
     In accordance with the present invention, the inventive mobile patient rocking chair assembly  100  provides a chair  106  with removable inserts  112  and  114 . Each insert  112  and  114  fits within a corresponding cavity  116  and  118 , respectively, formed in the chair  106 . More specifically, the removable insert  112  fits within the cavity  116  formed in the back portion  110  of the chair  106 . Similarly, the removable insert  114  fits within the cavity  118  of the seat portion  108  of the chair  106 . 
     Although any material can be used, in accordance with a preferred embodiment of the present invention, each removable insert  112  and  114  features a cushion on its interior surrounded by a “breathable” material  120 , such as cloth. It is envisioned, that the cushion surrounded by the breathable material  120  is surrounded by a waterproof non-permeable protective covering that prevents moisture from contacting the cushion material. The waterproof protective covering can be, for example, plastic, vinyl, leather, Naugahyde, or other similar materials. 
     In accordance with embodiments of the present invention, the back portion  110  of the chair  106  and the seat portion  108  of the chair  106  can be covered in a waterproof material  122 , such as vinyl, leather, Naugahyde, plastic, and other similar materials that do not allow moisture to penetrate to the interior of the back portion  110  or the seat portion  108 . 
     Upon the detection of an incontinence episode or any other occurrence of moisture contacting the chair  106 , the novel chair can be quickly and effectively cleaned. In a first step, the removable inserts  112  and  114  are removed from their respective cavities  116  and  118 . The breathable material  120  is then removed from its supporting cushion. The removal can be through use of a zipper, VELCRO, elastic material, or other materials that allow the breathable covering material  120  to be removed from its cushion. 
     Next, the cushions, which are, as described above, covered in a waterproof material, are wiped down with a disinfecting solution. Similarly, the back portion  110  and the seat portion  108 , which are both also covered with a waterproof material, are wiped down with a disinfecting solution. This includes the cavity portions  116  and  118 . Because both of the removable inserts  112  and  114  and the back portion  110  and the seat portion  108  are waterproof, no moisture penetrates to the interior of either. It should be noted that the shape and size of the removable inserts  112  and  114  and corresponding cavity portions  116  and  118  are merely exemplary and the present invention is not so limited. In one embodiment, the lower insert  112  extends to and up the back portion  110  of the chair  106  and features an “L” bend that captures liquid. In another embodiment the upper insert  112  extends to the bottom of the back portion  110 . 
     The removable breathable coverings  120  of the removable inserts  112  and  114  can easily be washed and replaced back onto their respective cushions once clean. In addition, any patterns or colors used on the coverings  120  can be easily updated without having to re-upholster the entire chair. Furthermore, the cushions within the breathable coverings  120  can be selectively replaced with cushions of varying densities. For example, a cushion having an increased density can be used for a heavier patient, where a cushion of a lower density can be used for a lighter patient. In this way, the chair can be configured specifically to the desires of the patient. 
     The inventive chair  100  can also be provided with optional pads that slip onto the seat portion  108 , back portion  110 , or the armrests to provided improved comfort for the user. 
     Advantageously, the inventive chair  106  of the mobile patient rocking chair assembly  100  provides an ergonomic comfortable seat that conforms to the patient&#39;s body as well as a seat and back portion that does not trap heat and moisture as do prior-art patient seats but can also be cleaned quickly, easily, effectively, and inexpensively. 
     Exercise Handles 
     Referring now to  FIG. 2 , the front-side downward-looking perspective view of the mobile patient rocking chair assembly  100  shows a left  202  and a right  204  exercise handle that can be removably attached to the undercarriage  102 . The left exercise handle  202  features a coupling portion  206  that selectively removably couples to a receiver  208  in the left side of the undercarriage  102 . Similarly, the right exercise handle  204  features a coupling portion  210  that selectively removably couples to a receiver  212  in the right side of the undercarriage  102 , although the right-side receiver  212  cannot be seen in the left-side perspective view of  FIG. 2 . 
     The undercarriage  102  provides therein a rocking mechanism  215  that allows the chair  106  to move back and forth with respect to a frame  216 . The rocking mechanism  215  will be described in detail below however, for the instant discussion, it is to be understood that the rocking mechanism  215  provides a rocking motion similar to that found in many prior-art nursing chairs utilized by new mothers to rock their babies. 
     As with prior-art rocking chairs, the rocking motion can be caused by movement of the user&#39;s upper body or by a force applied by the user&#39;s feet, which causes the upper portion of the chair to move relative to the frame  216 . Advantageously, the left  202  and right  204  exercise handles of the present invention provide a further structure for allowing a user to obtain exercise. That is, in addition to the standard methods of pushing with their feet or rocking their upper body, a user can now utilize a pushing or pulling on with their arms to cause the chair  106  to rock with relation to the frame  216 . Pushing and/or pulling on the exercise handles  202 ,  204  involves the user&#39;s chest muscles, back muscles, triceps, biceps, and other muscles that are not involved in traditional rocking motion. 
     Advantageously, because the exercise handles  202 ,  204  are removably coupled to the undercarriage  102 , they can be selectively removed and stored when not needed, which allows improved mobility and an improved ability for the user to enter and exit the chair  106 . In accordance with an embodiment of the present invention, the exercise handles  202 ,  204  can be reconfigured to provide a push handle so that a technician can push the mobile patient rocking chair assembly  100 , for example, down a hallway. Several alternative embodiments allow the exercise handles  202 ,  204  to be utilized as pushing handles. In accordance with a first embodiment, the back portion  110  of the chair  106  is provided with a left  214  and a right  217  armrest. Each armrest  214 ,  217  is provided with a receiver  218 ,  220 , respectively. Each receiver  218 ,  220  is substantially similar to the receivers  208 ,  212  formed and the undercarriage  102 . In this embodiment, the exercise handles  202 ,  204  are simply relocated from their respective receivers  208 ,  212  in the undercarriage  102  to the receivers  218 ,  220  in the armrest portions  214 ,  217 , respectively. Advantageously, the exercise handles  202  and  204 , when in the secondary receivers  218 ,  220 , are not only conveniently stored and out of the way of the person seated in the chair  106 , but can now be used by a person pushing the chair. 
     Alternatively, the armrests  214 ,  217  can be removed from the back portion  110  and the exercise handles  202 ,  204  can be inserted into exposed receivers  222 ,  224  of which the armrests  214 ,  217  were previously inserted. In this mode, because the armrests  214 ,  217  are no longer present, a seat belt  226  can be utilized to ensure that the patient does not become separated from the chair  106 . 
     It should be noted that the primary left receiver  208  and its non-illustrated counterpart, right receiver  212 , can be provided in locations other than that shown in  FIG. 2 . Other suitable locations will be apparent from the below description of further mechanical elements of the rocking mechanism  215 . 
       FIGS. 15 and 16  provide an illustration of an alternate coupling between the exercise handles  1502  and  1504  and an undercarriage  1500 . The close-up view of  FIG. 16  shows that each of the handles  1502  and  1504  have lower coupling portions  1506  and  1508 , respectively, that slidably engage with extensions  1510  and  1512 , respectively, of the undercarriage  1500 . The extensions  1510  and  1512  are mechanically and fixedly attached to the undercarriage  1500  and provide structural support for attaching the handles  1502  and  1504  to the undercarriage  1500 . 
     In accordance with the embodiment shown in  FIGS. 15 and 16 , each of the coupling portions  1506  and  1508  is provided with a set of teeth  1514  and  1517 , respectively. Likewise, each of the extensions  1510  and  1512  of the undercarriage  1500  are provided with a corresponding set of teeth  1518  and  1520 . The teeth allow the handles  1502  and  1504  to be coupled to the undercarriage  1500  in one of a plurality of selectable angles, or rotational positions, around an axis of the extensions  1510  and  1512 . Each of the coupling portions  1506  and  1508  is provided with a set key  1522  and  1524 , respectively. Each set key  1522  and  1524  engages with one of the extensions  1510  and  1512  and independently selectively fixes a rotational position of its respective handle  1502  and  1504  about the axis of its respective extensions  1510  and  1512 . In one embodiment, the set keys  1522  and  1524  include threaded members that are received within a threaded interior of a corresponding one of the extensions  1510  and  1512 . By selectively fixing the handles  1502  and  1504  to the undercarriage  1500 , the handles  1502  and  1504  and undercarriage  1500  allow the user to cause the chair (not illustrated in  FIG. 15 ) to move in a substantially lateral direction, i.e., back and forth, with respect to a frame  1516 , by applying sufficient force to the grasping ends  1501  and  1503  of the handles  1502  and  1504 , respectively, while sitting upon the chair. By selecting from among many available angles for attaching the handles  1502  and  1504  to the undercarriage  1500 , the user can select the most comfortable position of the handles  1502  and  1504  and/or the position that targets a particular muscle(s) while performing the pushing/pulling exercises made available by the handles  1502  and  1504 . 
     Exercise Bands 
     Referring now back to  FIG. 2 , in a further embodiment of the present invention, the mobile patient rocking chair assembly  100  includes a set of exercise connector points  230   a - n  (where “a-n” represents any range of numbers) along the back portion  110  and, in some embodiments, along the seat portion  108  of the chair  106 . The exercise connector points  230   a - n  shown in this view are simply half loops that provide points of attachment for connectors. The loops can be solid or flexible. 
     Referring now to  FIG. 3 , a pair of elastic exercise resistance bands  302  and  304  are showing coupled to respective ones of the exercise connector points  230   a - n  on the back portion  110  of the chair  106 . The resistance bands  302 ,  304  can be, for example, plastic, rubber, or other stretchable materials. The exercise resistance bands  302  and  304  are provided with exercise handles  306  and  308 , respectively. The exercise handles  306  and  308  are gripped by a patient seated in the mobile patient rocking chair assembly  100  and used to cause the resistance bands  302  and  304  to stretch against the resistance forces provided by the elastic properties of the resistance bands  302  and  304 . Overcoming the resistance forces causes the user&#39;s muscles to exert force, provides muscle stimulation for the user, resulting in muscle conditioning, increased heart rate, and improve health. The specific muscles targeted by the particular exercise can be selected based on which of the exercise connector points  230   a - n  the resistance bands  302  and  304  are coupled to. For example, the patient can perform exercise motions that target their chest area when the resistance bands  302  and  304  are coupled to exercise connector points  230  on the upper area of the back portion  110  of the chair  106 . The patient can perform exercise motions that target their arms, e.g., biceps, when the resistance bands  302  and  304  are coupled to exercise connector points  230  of the seat portion  108  of the chair  106 . When the exercise resistance bands  302  and  304  are coupled to the exercise connector points  230  on the lower area of the back portion  110 , multiple muscles are involved in the exercise, such as shoulders, biceps, and chest. 
     The resistance bands  302  and  304  can be quickly and easily detached from the exercise connector points  230  and stored, for example, in a storage bin  402  shown in  FIG. 4 . 
     Transfer Mat 
     Referring still to  FIG. 3 , the mobile patient rocking chair assembly  100  is shown provided with a pair of transfer mats  310  and  312 . More specifically, the seat portion  108  of the chair  106  features a first pocket  314  that receives and conceals the first transfer mat  310  and a second pocket  316  (not visible in the left-side perspective view of  FIG. 3 ) that receives and conceals the second transfer mat  312 . Each transfer mat  310 ,  312  is operable to extend from and be inserted within its respective pocket  314 ,  316 . Once removed from its pocket, the transfer mat is placed as far as is reasonable possible between the seat and the patient&#39;s buttocks. Transfer mats and methods of using transfer mats are described in U.S. Pat. No. 4,700,416, issued to the inventor of the present invention. In accordance with all embodiment of the present invention, an upper surface of the transfer mat  310 ,  312  is provided with a low-resistance material that allows easy transfer of the patient across the transfer mat  310 ,  312 . 
     An exemplary method of using the transfer mats  310 ,  312  would be as follows. A patient seated in the mobile patient rocking chair assembly  100  is wheeled to a position adjacent a receiving surface. For example, the patient may be wheeled next to a toilet. Next, the appropriate armrest  214 ,  217  would be pivoted upward or simply removed from the chair  106 . The appropriate transfer mats  310 ,  312  (left or right) would then be removed from the pocket  314 ,  316 . The proximal end of the transfer mat is placed between the patient&#39;s buttocks and the distal extended end of the transfer mat  310 ,  312  would reach and rest upon the destination surface. At this point, a bridge is provided from the seat portion  108  of the chair  106  to the destination seating location. 
     In accordance with an alternate embodiment of the present invention, once extended, as shown in  FIG. 3 , each transfer mat  310 ,  312  remains secured to the seat portion  108  at its proximal end. The opposing distal end of each transfer mat  310 ,  312 , when the transfer mats are being utilized, is placed on a receiving surface. Generally, only one transfer mat  310 ,  312  will be used at any given time. Once extended, the transfer mat  310 ,  312  advantageously provides a bridge for sliding the patient from the seat portion  108  to the destination location, e.g., a patient bed, a toilet, a dining chair, etc. 
     In accordance with an embodiment of the present invention, the lower surface of the transfer mats  310 ,  312  are provided with a shape or material that provides resistance and prevents the transfer mat  310 ,  312  from moving away from the surface upon which it rests. The resistance shape can include notches in the lower portion of the board that receives portions of the destination surface. In other words, the notches grasp onto portions of the surface and prevent separation of the mat from the surface. 
     In an alternative embodiment, the seat portion  108  of the chair  106  is not provided with pockets for receiving and storing the transfer mats  310 ,  312 . In this embodiment, as shown in  FIG. 4 , the back portion  110  of the chair  106  is provided with a storage bin  402 . Here, only one transfer mat  310  is needed. A single transfer mat  310 , when necessary, is removed from the storage bin  402  and used to transfer the patient from whichever side of the seat portion  108  is appropriate. Here, the proximal end of the transfer mat  310  is simply placed on an edge of the seat portion  108  and the distal end of the transfer mat is placed on a surface of the destination location, thereby creating a bridge from the seat portion  108  to the destination location. Again, in this embodiment, the upper surface of the transfer mat  310  provides as little physical resistance as possible and the lower portion of the transfer mat  310  provides resistance that secures the transfer mat  310  and prevents it from slipping during the transfer process. 
     Adjustable Height 
     Looking to the rear-facing perspective view of  FIG. 4 , a further alternative feature of the present invention is shown. In this view, a pair of height-adjustment members  406  can be partially seen positioned under the chair  106 . The height-adjustment members  406  have a lower portion fixedly coupled to the undercarriage  102  and are attached at an upper portion to the chair  106 . When operated, the height-adjustment members  406  can selectively raise or lower the chair  106 . The height-adjustment members  406  can be ratcheting devices, gas springs, hydraulic mechanisms, electric motors, or any other apparatus for raising and lowering the height of the chair  106 . 
     The height-adjustment members  406  are particularly useful for matching the height of the seat portion  108  to an adjacent surface onto which the patient is to be transferred. If the height between the seat portion  108  matches the surface onto which the patient is to be transferred, the transfer mat  310 ,  312  can be easily extended from within its respective pocket  314 ,  316  and easily rests on the adjacent surface. 
     In a first embodiment of the present invention, the patient seated within the chair  106  is able to manipulate the height-adjustment members  406  to cause the chair to raise or lower. This can be done by providing a handle, for example, handle  408  shown in  FIG. 4 , that the patient can easily reach in manipulate. In other embodiments, the control for the height adjustment members  406  is accessible only to a technician assisting the patient. 
     Arm Rest 
     As the rear-facing perspective view of  FIG. 4  illustrates, the armrests  214 ,  217  can be provided with a tactile feature  404 . The exemplary tactile feature  404  illustrated in  FIG. 4  is a curved ball-like shape. It has been scientifically proven that people, in particular, elderly persons, benefit from regular use of their tactile senses. By providing the alternative tactile feature  404  on the armrest  214 ,  217  a patient seated within the chair  106  has the tactile feature  404  at their fingertips at all times. Touching and allowing their fingers to explore the shape of the tactile feature  404  provides constant stimulation for the patient, thereby producing a positive therapeutic result both physically and mentally. 
     Embodiments of the present invention allow the tactile feature  404  shown in  FIG. 4  to be exchanged with alternate tactile features having shapes that vary from that shown in  FIG. 4 . The alternate tactile features can simply snap into place once the tactile feature  404  is removed. 
     Rocking Mechanism 
     Referring now to  FIG. 5 , the undercarriage  102  is shown in a perspective left-hand partial rear view. The undercarriage  102  has a frame  216  that includes a lower center support member  502  that couples to a lower left runner  501  on the left side thereof and a lower right runner  503  on the right side thereof. The lower center support member  502 , the lower left runner  501 , and the lower right runner  503  provide the main structure upon which the other undercarriage components are supported. This main frame structure is spaced from the flooring surface upon which the chair is supported and receives mobility from the plurality of wheels  104   a - d . More specifically, left-side wheels  104   a ,  104   d  are attached to the lower left runner  501  and the right-side wheels  104   b ,  104   c  are attached to the lower right runner  501 . The wheels shown are caster-type wheels, but do not necessarily have to be casters. 
     Extending from a central location along the lower center support member  502  is a crossbar  504  that extends in a diagonal upward direction. Attached to the crossbar  504  at a height above the lower center support member  502  is an upper center support member  602 , which is best shown in the front left-hand side perspective view of the undercarriage  102  in FIG.  6 . The upper center support member  602  couples to an upper left runner  601  on the left side thereof and an upper right runner  603  on the right side thereof. The left and right upper runners  601  and  603  are substantially parallel to the left and right lower runners  501  and  503 . Each of the connections between the lower center support member  502 , the lower left runner  501 , the lower right runner  503 , and the crossbar  504  is fixed, e.g., welded. Similarly, each of the connections between the crossbar  504 , the upper left runner  601 , and the upper right runner  603  is fixed, e.g., welded. 
     Returning once again to left-side view of  FIG. 5 , it can be seen that a left front swing bar  508  and a left rear swing bar  510  are attached to the left upper runner  601 . In accordance with the present invention, each of the left swing bars  508 ,  510  are rotationally coupled to the left upper runner  601  at their upper ends. This rotational coupling allows the left swing bars  508 ,  510  to rotate with respect to the fixed left upper runner  601 . A coupling linkage  700  allows the left swing bars  508 ,  510  to rotate with respect to the left upper runner  601 . The coupling linkage  700  is shown in detail in  FIG. 7  and fully described below in the section entitled “Coupling Linkage.” 
     At their lower ends, each of the left swing bars  508 ,  510  are rotationally coupled to a left swing bar connector  512 , which places the left swing bars  508 ,  510  in mechanical communication with each other at their lower ends. Because the left swing bars are rotationally coupled to the left swing bar connector  512 , when the left swing bars  508 ,  510  swing relative to the fixed left upper runner  601 , the left swing bar connector  512  also moves relative to the left upper runner  601 . 
     A left vertical support member  514  is coupled to the left swing bar connector  512  and extends upwardly and substantially perpendicularly therefrom. Referring once again to  FIG. 6 , the downwardly-looking perspective view of the undercarriage  102  with the chair portion  106  removed shows that a chair coupling platform  604  is provided at an upper portion of the vertical support member  514 . The chair coupling platform  604  provides a location for the chair  106  to be attached. 
       FIG. 6  also shows that the left front swing bar  508  has a right counterpart  606  on the right side of the frame. Likewise, the left swing bar connector  512  has a right counterpart  608  on the right side of the frame, which is itself coupled to a right vertical support member  614  that mirrors the left vertical support member  514 . Although it cannot be seen in the perspective left-side view of  FIG. 6 , the left rear swing bar  510  also has a right counterpart  607 . In essence, the undercarriage  102  provides two separate four-bar linkage assemblies, with elements  601 ,  508 ,  512 , and  510  defining the left four-bar linkage assembly. Likewise, elements  603 ,  606 ,  607 , and  608  define the right four-bar linkage assembly. 
     During a swinging motion, once the chair  106  is mechanically coupled to the chair coupling platform  604 , the chair  106  will move in unison with the swing bar connectors  512 ,  608 . The mechanical movement of the rotating swing bars  508 ,  510 ,  606 ,  607  gently moves the swing bar connectors  512 ,  608  forwards and backwards delivering a gentle rocking motion to the attached chair  106 . 
     Coupling Linkage 
       FIG. 7  provides an exploded perspective view of a coupling linkage  700  that is used in accordance with an embodiment of the present invention to provide the rotational coupling between elements of the left and right four-bar linkage assemblies shown in  FIGS. 5 and 6 . 
     The coupling linkage  700  includes a first sleeve insert  702  and a second sleeve insert  704 . A shaft  706  is fixedly coupled to one of the sleeve inserts, in this embodiment, the second sleeve insert  704 . A bearing  708  is coupled to the opposing sleeve insert  702  by a cap  714 . A circlip  710  is used to secure one end of the shaft  706  within the bearing  708 . The circlip  710  is a semi-flexible metal ring fastener with open ends which can be snapped into place, into a machined groove  712  on an interior edge of the bearing  708 , to permit rotation but to prevent lateral movement of the shaft  706 . Because the shaft  706  is fixedly attached to the second sleeve insert  704 , the circlip  710  ensures that during rotation, the first  702  and second  704  sleeve inserts remain a fixed lateral distance from each other. 
     In the embodiment shown in  FIG. 7 , the right sleeve insert  702  is provided with a right cap  714  and the left sleeve insert  704  is provided with a left cap  716 . Each cap  714 ,  716  has a dimension that is slightly larger than that of the sleep insert upon which it is connected. The larger dimension of the caps  714 ,  716  allows the sleeve inserts  713 ,  714 , respectively to only travel a certain distance into the sleeves in which they are installed. The larger dimension of the caps  714 ,  716  will hit the sleeves and prevent further entry of the sleeve inserts. 
     Referring again back to  FIG. 5 , and focusing on the left rear swing bar  510  and the left upper runner  601 , the coupling linkage  700  is shown coupling the two members  510 ,  601  together. In particular, the first cap  714  can be seen extending from the left upper runner  601  and the second cap  716  can be seen extending from the left rear swing bar  510 . Within the left upper runner  601  is the first sleeve insert  702 . Likewise, within the left rear swing bar  510  is the second sleeve insert  704 . A pair of bolts  516  penetrate through the left rear swing bar  510  and into a set of threaded voids  718  shown in  FIG. 7 . The bolts  516  secure the sleeve insert  704  within the sleeve of the left rear swing bar  510 . 
     The inventive coupling, linkage  700  advantageously provides for quick and easy assembly of the components of the undercarriage  102 . One simply needs to insert the sleeve inserts  702 ,  704  within any particular members of the undercarriage assembly requiring pivotable coupling. Upon the securing of a couple of bolts  516 , the two components are securely pivotably connected. The coupling linkage  700  thereby obviates the need for assembling the rotationally-related parts at the factory and shipping them in a larger assembled configuration. In addition, unlike other bearings that must be pressed out of the assembly parts, the coupling linkage  700  can quickly and easily be replaced if necessary. 
     Variable Resistance Member 
     As has been scientifically proven, the motion of rocking produces a myriad of positive therapeutic effects on the human body. In addition to the simple rocking movement, forces exerted by the human body to cause the rocking motion have the benefit of stimulating the muscles of the user and increases heart rate and blood flow as well. For this reason, it has been found to be advantageous to provide a resistive force to the rocking mechanism so that the user is caused to exert force in order to perform the rocking movement. 
     Referring now to  FIG. 8 , a perspective partial close-up view of the undercarriage is shown. A variable resistance member  800  can be seen positioned on top of the crossbar  504 , in this particular embodiment, the variable resistance member  800  has a main body section  802  that is fixedly coupled to the fixed crossbar  504 . The variable resistance member  800  also has a movable piston  804  that is received by and extends from the body section  802 . At its distal end, the movable piston  804  is fixedly coupled to the movable chair coupling platform  604 . As was explained above, because of the provision of the swing bars, the chair coupling platform  604  is able to move back and forth relative to the crossbar  504 . Therefore, when the chair coupling platform  604  moves, the piston  804  slides into or out of the body section  802  in correspondence to the movement of the chair coupling platform  604 . 
       FIG. 9  provides an elevational side view of the variable resistance member  800 . The type of variable resistance member  800  depicted in  FIGS. 8 and 9  is commonly referred to as a “gas spring.” in these devices, as the piston  804  moves into and out of the body section  802 , a return time  902  allows a gas contained within a first compartment of the body section  802  to transfer to a second compartment of the body section  802 . By controlling the resistance applied to this gas-exchange process, the resistance necessary for moving the piston  804  with reference to the body section  802  can also be controlled. More specifically, by making it more difficult for the gas to travel through the return line  902 , it also becomes more difficult to move the piston  804  with reference to the body section  802 . In contrast, by making it easy for the gas to travel through the return line  902 , less force is needed to move the piston  804  with reference to the body section  802 . Therefore, the present invention provides a control knob  904  on the variable resistance member  800 . By manipulating the control knob  904 , the resistance necessary to move the piston  804  with reference to the body section  802  is selectively adjusted. 
     Once again, referring to  FIG. 8 , because the body section  802  of the variable resistance member  800  is fixedly coupled to the stationary crossbar  504  and the piston  804  is fixedly coupled to the movable chair coupling platform  604 , one simply needs to manipulate the control knob  904  to selectively adjust the amount of force necessary to cause the chair  106  to rock relative the stationary frame section  502 ,  504 . 
     It should be noted that the embodiment of the variable resistance member  800  is merely exemplary and many other types of devices that can provide a movable resistance can be used and are within the spirit and scope of the present invention. 
     If the rocking motion is caused by force applied by the user&#39;s feet, force applied by the variable resistance member  800  advantageously results in an exercise that focuses on the user&#39;s legs. When the exercise handles  202 ,  204  shown in  FIG. 1  are utilized, resistance applied by the variable resistance member  800  advantageously results in an exercise that is directed to the user&#39;s arms. 
     Foot Rest 
     A footrest  610  is shown in  FIG. 6  and is slidably mounted onto the left and right runners  501  and  503 , respectively, by a pair of support arms  612  and  614 . Each of the support arms  612  and  614  include a set of bearings or rollers  616  and  618  mounted on opposite sides of the left and right runners  501  and  503  and slidable thereon. The footrest  610  thus can be moved back out of the way for a patient to enter or exit the chair. In addition, if the chair hits an obstacle, the footrest can simple slide backwards to avoid damage. The footrest  610 , although illustrated in a fixed orientation, also can be adjustable to different heights to accommodate the size of different patients. 
     As  FIG. 6  also shows, when the footrest  610  is slid all the way forward, the support arms  612  and  614  are immediately adjacent the front wheels  104   a  and  104   b . The adjacency between the support arms  612  and  614  and the front wheels  104   a  and  104   b  ensures that the front wheels  104   a  and  104   b  are aligned in a forward direction and also prevents the front wheels  104   a  and  104   b  from being able to turn as the chair is being moved. The rear wheels  104   c  and  104   d , of course, remain free to rotate and allow the person pushing the chair to manipulate the trajectory of the chair as it moves. 
     In other embodiments, the footrest  610  does not prevent rotation of the front wheels  104   a  and  014   b . For example,  FIG. 15  shows a foot rest bracket  1506  that defines a space  1508  around the front wheel  104   a . Although it cannot be seen in  FIG. 15 , a similar space allows opposing front wheel  104   b  to freely rotate about its mounting axis. 
     Drive Motor 
     Referring once again to  FIG. 5 , a drive motor  520  is shown coupled to a lower section of the undercarriage  102 . The drive motor  518  includes a driving wheel  520  that makes contact with the floor. Upon activation of the drive motor  518 , the driving wheel  520  will cause the mobile patient rocking chair assembly  100  to move. In accordance with an embodiment of the present invention, the motor  518  is electrically coupled to a push handle, such as push handle  1002  illustrated in  FIG. 10 . A button  1004  is electrically coupled to the motor  518  and, when manipulated, causes the motor  518  to rotate the drive wheel  520  and move the mobile patient rocking chair assembly  100  in a direction. This is convenient for the technician charged with moving the mobile patient rocking chair assembly  100 . Drive motors, power sources, switches, and driving wheels are well known in the art and, as such, are not described in great detail here. 
     Rocking Prevention 
     It is anticipated that there will be times when the rocking feature of the present invention will not be desired. For instance, when an attendant is pushing the patient rocking chair assembly  100 , continuous rocking by the user would interfere with the attendant&#39;s navigation of the patient rocking chair assembly  100 . In addition, there may be times, for example, when the user is eating, that the rocking function would not be appropriate. For this reason, embodiments of the present invention provide one or more features for selectively preventing rocking. Referring first to  FIGS. 17 and 18 , the perspective downward-looking left rear view of the mobile patient rocking chair assembly shows a rotatable frame bar  1702  that is coupled to the frame  1516  of the undercarriage  1500  and spans between the two rear wheels, Near its center, the frame bar  1702  is fixedly coupled to a lockout member  1704 . As will now be explained in detail, the lockout member  1704  is a rod that is selectively engageable with the rocking mechanism  1515  and selectively and fixedly couples the frame  1516  to the rocking mechanism  1515  when desired, to prevent rocking of the rocking mechanism  1515  relative to the frame  1516 . 
       FIG. 20  provides a more detailed view of the rocker-stopping assembly in accordance with an embodiment of the present invention. In  FIG. 20 , a frame bar coupler  2002  is rotationally fixedly coupled to the frame bar  1702  and exhibits a rotation that corresponds to a rotation of the frame bar  1702 . Referring briefly to  FIG. 19 , a pair of foot levers  1902  are shown coupled to the frame  1516  and, more specifically coupled to both ends of the frame bar  1702 . The foot levers  1902  allow an attendant to cause a rotation of the frame bar  1702  simply by applying pressure with the attendant&#39;s foot. 
     Referring once again to  FIG. 20 , a pin  2004  couples the frame bar coupler  2002  to a proximal lockout bar coupler  2006  that is attached to a proximal end of the lockout member  1704 . Therefore, because the frame bar  1702  and the frame bar coupler  2002  share an axis of rotation, as the frame bar  1702  rotates about its longitudinal axis, the frame bar coupler  2002  experiences the same rotation and causes the connector pin  2004  to move in an arcuate path around the longitudinal axis of the frame bar  1702 . This movement of the connector pin  2004  pushes or pulls the lockout bar  1704  in a mostly longitudinal direction along its length. At the distal end of the lockout bar  1704  is a distal lockout bar connector  2010  that is coupled to a rocking mechanism engagement member  2012  that experiences a corresponding displacement as the lockout bar  1704  moves. 
     Coupled to the rocking mechanism  1515  of the undercarriage  1500  is a receiver plate  2014  that defines and aperture  2016 . The receiver plate  2014  is fixedly attached to the rocking mechanism  1515  so that the rocking mechanism  1515  cannot move without also moving the receiver plate  2014 . The aperture  2016  within the receiver plate  2014  is sized to receive at least a portion of the rocking mechanism engagement member  2012 . Therefore, movement of the foot levers  1902  rotate the frame bar  1702  which then causes a longitudinal movement of the lockout bar  1704  and moves the engagement member  2012  either into or out of the aperture  2016  in the receiver plate  2014 . The movement into the aperture  2016  by the engagement member  2012  either fixedly couples the frame  1516  to the rocking mechanism  1515 . This fixed coupling prevents movement of the rocking mechanism  1515  relative to the frame  1516  and, therefore prevents rocking. In contrast, disengagement of the engagement member  2012  from the aperture  2016  of the receiver plate  2014  allows the rocking mechanism  1515  to move independently, although always supported by, the frame  1516 . Therefore, the foot levers  1902  advantageously allow an attendant to selectively prevent rocking. 
     In an alternative embodiment, which is shown in  FIG. 10 , the left lower swing bar connector  512  passes directly above the motor  518 . In accordance with this embodiment, the motor  518  is provided with a pin  1006  that extends upwards from the motor  518  when the motor  518  is activated. The pin  1006  engages with a receiving hole formed in the bottom surface of the left lower swing bar connector  512  and prevents the left tower swing bar connector  512  from moving relative to the lower center support member  502 . In this configuration, rocking is halted when the device is moving under power from the motor  518 . Preventing rocking motion while moving the inventive mobile patient rocking chair assembly  100  is advantageous. Rocking can cause the device to move in unintended ways, which can have ill effects, for instance, when maneuvering in tight areas. 
     Of course, a pin extending from the motor  518  is only one possible way of preventing the swinging members of the undercarriage  102  from moving. Many other methods of preventing the chair  106  from rocking while the device is under power is contemplated and within the scope of the present invention. For instance, as shown in  FIG. 5 , a spring-loaded pin  522  fixedly coupled to the left vertical support member  514  can engage with a hole in the left upper runner  601  and prevent movement of the left vertical support member  514  relative to the left upper runner  601 . The spring bias of the pin  522  can be in a direction toward the left upper runner  601  so that the pin  522 , unless secured in a non-engaged position, will rest in the hole of the left upper runner  601 . In addition, the left upper runner  601  can be provided with a plurality of receiving holes so that the pin  522  can be selectively placed in any one of the receiving holes to secure the chair  106  at one of several possible rocking positions. 
     In a farther embodiment, the motor  518  can be used to apply a resistive force to the rocking portions of the undercarriage  102 . In this embodiment, the motor  518  is selectively adjustable to resist motion by, for instance, the left lower swing bar connector  512 . For instance, a wheel coupled to and control by the motor  518  can be placed in contact with the left lower swing bar connector  512 . By adjusting the amount of power applied to the motor  518 , and thus the wheel, the resistive force applied to the left lower swing bar connector  512  can be selectively determined. 
     If the rocking motion is caused by force applied from the user&#39;s feet, force applied by the motor  518  advantageously results in an exercise that focuses on the user&#39;s legs. When the exercise handles  202 ,  204  shown in  FIG. 1  are utilized, resistance applied by the motor  518  advantageously results in an exercise that is directed to the user&#39;s arms. 
     It should be noted that a wheel coupled to and controlled by the motor  518  is merely exemplary and many other types of devices can be used to provide a movable resistance and are within the spirit and scope of the present invention. 
     In yet another embodiment shown in  FIG. 22 , the rocking mechanism  1515  includes a handle  2214  that is mechanically coupled to a shaft  2216  so that movement of the handle  2214  causes a translated rotation of the shaft  2216  along a longitudinal axis thereof. The shaft  2216  includes a U-shaped bend  2218  along its length wherein an apex of the U-shape is offset from the longitudinal axis of the shaft  2216 . When the handle  2214  is manipulated, the shaft  2216  rotates about its longitudinal axis and causes the apex of the U-shaped bend  2218  to move in an arcuate path around the longitudinal axis of the shaft  2216 . 
     The frame  1516  is provided with a receiving plate  2220  fixedly attached thereto. The frame plate  2220  has formed therein a series of receiving areas  2222  that are sized and shaped to receive a portion of the U-shaped bend  2218 . Mating the U-shaped bend  2218  with one of the receiving areas  2222  within the frame plate  2220  mechanically couples the rocking mechanism  1515  to the frame  1516  and prevents rocking from taking place. Of course the bend feature  2218  does not have to be in the shape of a U. Having the ability to mechanically coupled to the frame  1516  and the rocking mechanism  1515  is advantageous during times when rocking is not desired, such as while seated at a dinner table or when attempting to exit the chair  106 , among many other situations. Advantageously, because the receiving plate  2220  provides a plurality of receiving areas  2222 , a patient seated in the chair  106  (not shown in  FIG. 22 ) can select between several angles of recline while seated in the chair  106 . 
     Back Adjustment Angle 
     In accordance with an embodiment of the present invention, and as shown in  FIG. 11 , the back portion  110  has an angle that is selectively adjustable with relation to the seat portion  108 . This adjustment is similar to that of the seat found in an auto bile. Adjustment of the back portion  110  with relation to the seat portion  108  of the chair  106  advantageously provides the patient with a range of choices for the most comfortable sitting position. 
     Wheel Chair Wheels 
     Referring now to  FIG. 12 , the mobile patient rocking chair assembly  100  is shown in a downward-looking rear perspective view. In this embodiment, the mobile patient rocking chair assembly  100  features a coupling pin  1201  that couples to a large wheelchair type wheel  1202 . The term “wheelchair type wheel,” as used herein, is intend to indicate a wheel that can be manipulated by a patient&#39;s hands to propel the chair in a desired direction. The coupling pin  1201  can be inserted into the center of the wheelchair type wheel  1202  and the wheel  1202  secured so that it is fixedly rotationally coupled onto the coupling pin  1201 . Although not illustrated, a second wheel could be installed on the left side of the mobile patient rocking chair assembly  100 . 
     When in position, as shown in  FIG. 13 , the wheelchair type wheel  1202  extends further below the right runner  503  than does the left front wheel  104   b  (shown best in  FIG. 12 ), Advantageously, as with a standard wheelchair, the larger wheels  1202  allow a patient to easily maneuver their chair through whatever space is necessary/desired and obviates the need for an attendant to push it. 
     To assist with installing the wheelchair type wheel  1202  onto the pin  1201 , the mobile patient rocking chair assembly  100  is provided with a lever  1204  that, when operated, drives a lift member  1206  in a downward direction. When the lift member  1206  makes contact with the ground, further movement of the lever  1204  causes the front wheel  104   b  to lift off of the ground. Of course, this also lifts the coupling pin  1201  making it easy to slip the wheelchair type wheel  1202  onto the coupling pin  1201 . 
     In yet another embodiment of the present invention, as shown in  FIG. 21 , a pair of wheelchair wheels  2102  are coupled to a pair of spring-loaded levers, which are shown in  FIG. 21  as pivot arms  2106  and  2108 . Each of the pivot arms  2106  and  2108  is provided with an axle  2110  that extends away from each arm and provides a location for attaching the wheelchair wheels  2102 . In a preferred embodiment, however, the axle  2110  is fixedly attached to the wheelchair wheels  2102  and removably couples to receiving portions of the pivot arms  2016  and  2108 , the receiving areas being those locations shown receiving and holding the axles  2110  in  FIG. 22 . In this embodiment, where the axle  2110  remains attached to the wheelchair wheels  2102 , when the wheelchair wheels  2102  are removed, there are no axles extending from the chair. 
     To facilitate attachment, each of the wheel chair wheels  2102  features a quick lock  2112  that provides for quick removable coupling of the wheelchair wheel  2102  to the axle  2110  or of the axle to the spring-loaded pivot arms  2106  and  2108 . Quick couples are couplers that can be manipulated with a single hand and/or without tools, for example, one known quick coupler, manufactured by BIG SKY PRECISION, INC, of Manhattan, Mont., called the SKY LOC BUTTON-HANDLE, includes a shaft with a push-button on one end and two opposing members on the opposite end that are retracted by depression of the push-button. Other quick couplers are well known in the art and will not be explained in great detail here. The invention, however, does not require quick couplers and any mode of connecting the wheelchair wheel  2102  to the axle  2110  can be used. 
       FIG. 22  illustrates how the spring-loaded pivot arms  2106  and  2108  couple to the frame  1516 . The frame  1516  is provided with a left bracket  2204  with a pivot pin  2206  that passes through one side of the left bracket  2204 , through the left pivot arm  2106 , and through the other side of the left bracket  2204 . The spring-loaded pivot arm  2106  pivots upon pivot pin  2206  and is spring biased by a bias member, e.g., a spring,  2202  in a direction that biases the axle  2110  in a downward direction toward the floor. The bias member  2202  can be any mechanism that exerts an upward force on the side of the spring-loaded pivot arm  2106  and  2108  that is opposite the wheelchair wheel axle  2110  or exerts a downward force on the side of the spring-loaded pivot arm  2106  and  2108  that has the wheelchair wheel axle  2110  coupled thereto. 
     Similarly, the frame  1516  is provided with a right bracket  2208  with a pivot pin  2210  that passes through one side of the right bracket  2208 , through the right pivot arm  2108 , and through the other side of the right bracket  2208 . The spring-loaded pivot arm  2108  pivots upon pivot pin  2210  and is spring biased by a spring  2212  in a direction that biases the axle  2110  in a downward direction toward the floor. 
     Referring now back to  FIG. 19 , the wheelchair wheels  2102  are coupled to the wheelchair wheel axles  2110  of the spring-loaded pivot arms  2106  and  2108 . Because the springs  2202  and  2212  bias the spring-loaded pivot arms  2106  and  2108  in a direction that exerts a downward force on the wheelchair wheel axles  2110 , there is also a biasing force exerting a downward pressure on the wheelchair wheels  2102 . This downward force advantageously maintains contact between the wheelchair wheels  2102  and the floor. It allows a patient to easily propel and maneuver the mobile wheelchair assembly  100  the way a normal wheelchair is to be operated. 
     Advantageously, to remove the wheelchair wheels  2102 , an operator simply needs to place pressure, e.g., by pressing down with their foot, on the spring-biased end of the spring-loaded pivot arms  2106  and  2108 . When sufficient pressure is placed on the spring-biased end of the spring-loaded pivot arms  2106  and  2108  to overcome the biasing force, the wheelchair wheels  2102  lift off of the ground slightly and allow the operator to easily disconnect them from the axles  2110 . This easy connection and disconnection arrangement provides tremendous advantages in that there is no need to lift the chair from the ground in order to install or disconnect the wheelchair wheels  2102 . This is particularly useful when a patient needs to be transferred laterally from the chair to a nearby object such as, for example, a bed or a toilet. More specifically, referring briefly back to  FIG. 13 , it can be seen that the wheelchair wheel  1202  extends above the seating surface. Without removing the wheelchair wheel  1202 , the patient cannot be transferred laterally, sideways from the seat, without lifting them up and over the wheelchair wheel  1202 . This would create a great deal of difficulty on the attendants and introduce an element of danger to the patient. Because the present invention, as shown in  FIG. 19 , allows the wheelchair wheels  2102  to be removed quickly and easily, for the first time, the chair can be provided to the patient that allows them to navigate and also allows them to bury easily be maneuvered up to an adjacent structure and transferred with extreme ease and safety. 
       FIG. 23  shows an exemplary process flow diagram for utilizing the removable wheelchair wheels of the present invention. The process begins at step  2300  and move directly to step  2302  where a mobile patient rocking chair assembly  100  is provided without wheelchair wheels. In step  2304 , a patient is placed into the chair  106  of the mobile patient rocking chair assembly  100 . In step  2306 , the attendant places pressure, e.g., by pressing down with his foot, on one of the spring-biased ends of the spring-loaded pivot arms  2106  or  2108 . When sufficient pressure is placed on the spring-biased end of the spring-loaded pivot arm  2106  or  2108  the attendant is able to and does attach a wheelchair wheel  1202 ,  2102  to the wheel axle  2110  by using a quick connector  2112  provided at the hub of the wheelchair wheel  1202 ,  2102  in step  2308 . In the same step,  2308 , the attendant installs the opposing wheelchair wheel  1202 ,  2102 . In step  2310 , the patient uses the wheelchair wheels  1202 ,  2102  to navigate the chair along any path desired by the patient. In step  2312 , the patient or the attendant recognizes a need to transfer the patient from the mobile patient rocking chair assembly  100  to another patient support structure, for example, the patient&#39;s bed. In step  2314 , the attendant places pressure, e.g., by pressing down with his foot, on one or both of the spring-biased ends of the spring-loaded pivot arms  2106  and  2108 . When sufficient pressure is placed on the spring-biased end(s) of the spring-loaded pivot arms  2106  or  2108 , in step  2316 , the attendant is able to and does remove one or both of the wheelchair wheels  1202 ,  2102  from the wheel axle  2110  by using a quick connector  2112  provided at the hub of the wheelchair wheels  1202 ,  2102 . In step  2318 , the patient is transferred laterally from the chair  106  of the mobile patient rocking chair assembly  100  and into the target patient support structure. The process ends at step  2320 . 
     Tray 
     Looking now to  FIG. 14 , the mobile patient rocking chair assembly  100  is shown in a left-side perspective view where a tray  1404  is supported by a support bar  1402 . The tray  1404  is provided with a pair of clips  1406  that coupled to an upper portion of the support bar  1402 . When in use, the tray  1404  provides a surface for supporting food and beverages for the patient to enjoy. Tray  1404  includes a beverage holder  1408  that provides a recessed area for securing a drink. 
     When not in use, the tray  1404  can be easily stored in a storage compartment  402  provided on a backside of the back portion  110  of the chair  106 . The support bar  1402 , which is coupled to and supported by the left runner  501  and the right runner  503  at a front portion thereof can be removed and repositioned to a rear portion of the left runner  501  and the right runner  503 , which is also shown in  FIG. 14 . When moved to the rear position, the support bar  1402  is advantageously able to serve as a push handle for moving the mobile patient rocking chair assembly  100 . 
     Locking Wheels 
     It is anticipated that there will be times when lateral movement, i.e., roiling, of the present invention will not be desired. For instance, when an attendant is not around to supervise the patient or the when the mobile patient rocking chair assembly  100  is located near an incline. In addition, there may be times when the patient is someone that needs to have their movement restricted. For this reason, embodiments of the present invention provide a feature for selectively preventing locking of one or more of the wheels  104   a - n.    
     Referring to  FIG. 19 , a pair of foot levers  1902  are shown coupled to the frame  1516  of the undercarriage  1500  and, more specifically, coupled to both ends of a frame bar  1702 . The foot levers  1902  allow an attendant to cause a rotation of the frame bar  1702  simply by applying pressure with the attendant&#39;s foot. The frame bar  1702 , in the embodiment shown, is provided with a plurality of flat spots around its outer surface.  FIG. 19  also shows a wheel coupler  1904  rotationally fixedly coupled to the frame bar  1702 . 
     Located between the foot lever  1902  and the wheel coupler  1904  is an upper control portion  1908  of a caster  1910 . Casters are well known in the art and feature a wheel that is rotationally connected to a frame in a way that allows the wheel to rotate as it travels along the surface and also rotate about its connection point to the frame. These casters are commonly found on, for example, the front of the grocery shopping carts and on hospital beds. The casters, however, do not necessarily have to be rotationally connected so that they can rotate about the frame to which they are attached. Instead, the casters can be fixedly connected in a single position like, for example, the rear wheels of a grocery shopping carts. 
     In accordance with an embodiment of the present invention the upper control portion  1908  of the caster  1910  includes a locking feature that can prevent the wheel  1912  from rotating and, in accordance with some embodiments, can prevent the steering ability of the caster, i.e., rotation of the entire caster with reference to the frame  1516 . One exemplary known caster is part number 5444PJP100R36-32S30 manufactured by TENTE CASTERS, Inc. Other such casters are manufactured by RHOMBUS CASTERS, Inc., among others. Rotation of the frame bar  1702  which passes through the upper control portion  1908  of the caster  1910  engages and disengages the locking feature of the caster  1910 . 
     In addition to caster  1910  at its upper control portion  1908 , the frame bar  1702  also passes through the opposing rear caster  1912  and its upper control portion  1914 . The opposing rear caster  1912  can also be locked by the rotation of the frame bar  1702  which is affected by the foot lever  1902 . 
     As an example of the advantageous features of a locking caster  1910 , it is supposed that an attendant wishes to leave a patient in the chair with the rocking ability enabled. In this instance, the attendant might want to ensure that the chair does not move while it is being rocked. Advantageously, the attendant only needs to activate the foot lever  1902  which not only locks the rotating ability of at least one of the wheels, as explained above, it also disengages the frame  1516  from the rocking mechanism  1515  to allow rocking to take place. 
     Referring once again to  FIG. 20 , a pin  2018  couples the wheel coupler  1904  to a proximal end of a wheel-coupling rod  1906 . Therefore, because the frame bar  1702  and the wheel coupler  1904  share an axis of rotation, as the frame bar  1702  rotates about its longitudinal axis, the wheel coupler  1904  experiences the same rotation and causes the connector pin  2018  to move in an arcuate path around the longitudinal axis of the frame bar  1702 . This movement of the connector pin  2018  pushes or pulls the wheel-coupling rod  1906  in a mostly laterally direction along its length. At the distal end of the wheel-coupling rod  1906  is a front caster. By providing the wheel-coupling rod  1906 , movement of the foot lever  1902  can effectively lock both the rear and front casters in a single motion. 
     Therefore, embodiments of the present invention allow for multiple modes of operation in terms of the wheels. For example, in a first mode, when the attendant activates the foot lever  1902 , all four wheels lock both in frame rotation, i.e., swivel relative to the frame, and in rolling rotation, i.e., rolling about a surface. In a second mode when the foot lever  1902  is in the opposite position, all four wheels are allowed to move in and unrestricted fashion. In yet another mode, one of the wheels/casters is in a fixed position relative to the frame. In other words, it is not able to swivel. This is similar to the back wheel of a grocery cart, and allows for improved travel of the inventive chair assembly. In some embodiments, a foot lever is present on the front of the frame  1516  and is accessible by the patient seated within the chair. In this embodiment, the patient is able to selectively engage and disengage a locking feature of the wheels/casters. 
     As was explained above, the frame bar  1702  is fixedly coupled to a lockout bar  1704 , which is selectively engageable with the rocking mechanism  1515  and selectively and fixedly couples the frame  1516  to the rocking mechanism  1515 . Because the lockout bar  1704  and the wheel-coupling rod  1906  are both activated by rotation of the frame bar  1702 , manipulation of the foot lever  1902  has the ability of advantageously preventing rocking of the chair  106  any time the wheels are free to roll. Conversely when the foot lever  1902  is in the locked position, i.e., the wheels are locked and prevented from providing the patient chair with lateral motion across a supporting surface, the rocking feature is unlocked and the chair  106  is free to rock back and forth relative to the frame  1516 . In other words, when the wheels are unlocked, the chair is unable to rock and when the wheels are locked, the chair is able to rock in both functions are selected simply by depressing the foot lever  1902 . 
     In a second embodiment for allowing controlled locking of the wheels, and as is shown in  FIG. 14 , the left lower swing bar connector passes directly above a motion preventer  1410 . In accordance with an embodiment of the present invention, the motion preventer  1410  is provided with a pin  1412  that extends upwards from the motion preventer  1410 . The pin  1412  engages with a receiving hole formed in the bottom surface of the left lower swing bar connector  512  and prevents the left lower swing bar connector  512  from moving relative to the left runner  501 . 
     Each wheel  104   a - d  is provided with a brake  1414   a - d  that, when operated, prevents rotation of the wheel  104   a - d  to which it is coupled. Each brake  1414   a - d , in the particular embodiment shown in  FIG. 14 , has a lever  1416   a - d  that has a locked position for preventing movement of its respective wheel  104   a - d . In addition, each brake lever  1416   a - c  is electrically coupled to the motion preventer  1410 . In accordance with this embodiment, the motion preventer  1410  will not disengage the pin  1412  from the left lower swing bar connector  512  until at least one of the brake levers  1416   a - d  indicated that it is in a locked position, thereby able to prevent movement of its wheel. This feature ensures that a patient rocking in the mobile chair will not cause the chair to move. Preventing rocking motion while the inventive mobile patient rocking chair assembly  100  is mobile is advantageous. Rocking can cause the device to move in unintended ways and can be particularly dangerous near stairs. 
     Of course, a pin extending from the motion preventer  1410  is only one possible way of preventing the swinging members of the undercarriage  102  from moving. Many other methods of preventing the chair  106  from rocking while the wheels are unlocked is also contemplated. 
     Leg Rest 
     In accordance with the present invention, an adjustable leg rest can be coupled to the seat portion  108  of the chair  106 . The leg rest can resemble that of a typical recliner and provide a support for the lower portion of the user&#39;s legs. 
     Front Tilt 
     A further embodiment of a mobile patient rocking chair assembly  2400 , as shown in  FIG. 24 , includes an undercarriage  2402  that supports a chair  106  and features a set of wheels  104   a - d  (shown as casters in  FIG. 24 ) below that provide mobility to the undercarriage  2402 . The chair  106  is used to support a person when placed in the inventive patient rocking chair assembly  2400 . Although four wheels are show, the invention is not so limited and can utilize any number of wheels, rollers, casters, and other elements to provide mobility. 
     The connection between the chair  106  and the undercarriage  2402  is facilitated by a pivoting subassembly  2404  that includes a front frame brace  2406  coupled to an upper pivoting member  2408  upon which the chair  106  rests. The front frame brace  2406  and the upper pivoting member  2408  are coupled at a pivot point  2412 . At the rear of the upper pivoting member  2408  is an actuator  2405  that controls the amount of pivot between the front frame brace  2406  and the upper pivoting member  2408 . Because the chair  106  is mechanically coupled to the upper pivoting member  2408 , when the actuator  2405  causes the upper pivoting member  2408  to move relative to the front frame brace  2406 , the chair  106  experiences a corresponding movement in tilt angle.  FIGS. 24-26  illustrate an exemplary range of tilt angles that the chair  106  can experience under the control of the actuator  2405 . 
     In accordance with an embodiment of the present invention, the actuator  2405  is electrically powered and includes a control shaft  2410  that extends from or retracts within the control shaft housing  2411 . The actuator  2405  also includes a control and power supply  2416  and a control switch  2414 . When the control switch  2414  is activated, the power supply  2416  causes the control shaft  2410  to extend from or retract into the control shaft housing  2411 , thereby causing a corresponding angular adjustment between the front frame brace  2406  and the upper pivoting member  2408 . For example,  FIG. 24  shows the control shaft  2410  in a fully extended position placing the upper pivoting member  2408  in a substantially horizontal position, which also places the seat portion  108  of the chair  106  in a substantially horizontal position.  FIG. 25  shows the control shaft  2410  partially retracted into the control shaft housing  2411 , which movement causes the upper pivoting member  2408  to pivot at the pivot point  2412  in tilt the chair  106  into a partially reclined position.  FIG. 26  shows the control shaft  2410  fully retracted into the control shaft housing  2411 , thereby placing the chair  106  into a fully reclined position. Advantageously, because the upper pivoting member  2408  pivots at pivot point  2412 , which resides substantially directly below the patient&#39;s knee, the patient&#39;s feet can remained rested upon the foot rest  610  regardless of the angle of the upper pivoting member  2408 . 
     In other embodiments, the control switch  2414  is accessible to or can be controlled by a patient seated within the chair  106 . In this embodiment, the patient can dictate the recline angle of the chair  106 . 
       FIG. 27  provides an elevational left side view of the patient rocking chair assembly  2400  with a left wheel chair wheel  2102  coupled to the undercarriage  2402  through a left spring-loaded pivot arm  2106 .  FIG. 27  also shows the undercarriage  2402  provided with a left foot lever  1902  coupled to and running through an upper control portion  1908  of the caster  1910   d . In addition,  FIG. 27  shows a left wheel-coupling rod  1906  coupling the upper control portion  1908  of the rear caster  1910   d  to a front caster  1910   a . As was explained with regard to the embodiment shown in  FIGS. 15-22 , activation of the left foot lever  1902  in a first direction causes the rear caster  1910   d  to lock up and simultaneously, due to a corresponding movement of the left wheel coupling rod  1906 , the front caster  1910   a  also locks and prevents movement of the patient rocking chair assembly  2400 . 
       FIG. 28  provides a perspective left rear view of the patient rocking chair assembly  2400  and shows the left wheel-coupling rod  1906  and a right wheel-coupling rod  2804  in more detail. The left wheel coupling rod  1906  and the right wheel coupling rod  2804  are activated by rotation of the frame bar  1702 , which itself is activated by either the left foot lever  1902  or a right foot lever  2802 .  FIG. 28  also provides a perspective view of the actuator  2405 . 
       FIG. 29  provides a perspective left front view of the mobile patient rocking chair assembly  2400 .  FIG. 29  provides a clear view of the front frame brace  2406  and the upper pivoting member  2408 , which are coupled to each other at pivot point  2412 . 
     An inventive mobile patient rocking chair has been described that provides multiple unique self-activating features for physical and mental well-being. Embodiments of the invention provide a mobile chair capable of producing a gentle rocking motion that can, among other things, increase cardio vascular circulation and relieve pressure points for a patient which can produce the benefit of for example, prevent decubitus ulcers (“bed sores”). The present invention further provides an ergonomically shaped high backrest that is ideal for individuals who find it necessary or desirable to remain seated for extended time periods. The present invention is further capable of featuring attachable/detachable quick release wheelchair wheels for a patient&#39;s increased sense of mobility and independence. The wheelchair wheels can easily be removed to facilitate lateral transfers, even when a person is occupying the chair. Further advantages are realized through use of optional lower and/or upper body training features that provide increased physical and mental well-being. Hinged, foldable armrests allow for easy lateral transfer in and out of the chair and a central wheel locking provides increased safety and ease of operation, including automatic locking of the rocking mechanism when the wheels are unlocked. The inventive chair, in accordance with one embodiment, can be locked in five different comfortable tilt positions. Furthermore, a sliding footrest provides easy entrance to the chair and easy departure from the chair, while a height adjustable head rest provides increased comfort and neck support. A washable incontinence protection cover can be utilized that features optional, e.g., 30 mm, memory foam for increased comfort. A washable comfort seat cushion with, e.g., 30 mm, memory foam can also be included for increased comfort as can a washable comfort armrest cover with, e.g., 20 mm, memory foam for increased comfort.