Abstract:
A door opener assembly having a rotatable arm-bar for hands-free use by individuals in high-traffic pedestrian conditions. The rotatable arm-bar has a distal knobbed end and allows users to easily position a wrist or forearm within the hook and to move laterally, as the person moves, as the door is opened and thereafter provides a slide-release of the forearm or wrist. The smooth surface and design of the arm-bar allows users to disengage from contact without risk of injury occurring such as from the unexpected opening of the door from the opposite direction.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims benefit as a continuation-in-part of U.S. application Ser. No. 13/,354,795, filed Jan. 20, 2012, and U.S. Provisional Application No. 61/439,526, filed Feb. 4, 2011, the entire contents of which are hereby incorporated by reference herein in its entirety for all purposes. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    This invention relates to handles for doors and, in particular, to a method and apparatus for opening doors without using hands. 
       DESCRIPTION OF THE PRIOR ART 
       [0003]    Grab-bar handles, as they are termed by the trade, are used on most high-traffic manual door entries. Often a vertical bar is used on the entry pull-side of the door, with a horizontal bar on the exit push-side, but other combinations are also used. These vertical bars are typically 10-12 inches in length, while the horizontal bars are usually about the width of the door. Some bars are rectangular, some are round, and some are custom shaped; yet all have the characteristic that they are easy to see peripherally as the user approaches the door, and they are all easy to grab and use with little chance for sustaining an injury. Although grab-bars and doorknobs both present minimal risk of physical injury, doorknobs present a smaller profile which is often times more difficult for a user to quickly see and grab in fast paced high-traffic situations; thus doorknob profiles, because of their small shape, are seldom, if ever used for this type of application. 
         [0004]    When handles are used rather than those of the grab-bar type, they can be rotatably manipulated to operate a latch mechanism to displace the latch into the door and permit the hinged door to swing open using a minimal amount of pulling force applied to the handle after rotation. Handles of this type are either of a generally sphereical knob type or have an elongated handle where the handle can be rotated in a plane parallel to the adjacent door face. The space between the handle and door face is fixed and such a rigid space could cause injury to a person having their forearm disposed in this space if the door is unexpectedly swung open. 
         [0005]    Opening doors using a hands-free technique is known in the prior art. One reference which illustrates a hands-free door handle is U.S. Pat. No. 2,238,513 issued to Ward and discloses a door handle for hands-free opening of a door latch. The handle comprises a proximal end connected to the door, an elongated rod portion extending parallel to the door and in a direction away from the latch, a hook portion and a distal end orientated to be facing downward. The handle can be displaced along an arc parallel to the door, either upward or downward to release the latch. Ward does not pertain to high-traffic uses since a latch mechanism is operated by the movement of the handle. 
         [0006]    An issue with the use of grab-bar handles is that they can transmit germs left by a previous user to a subsequent user. Grabbing a door handle by a hand can contact the contagion left by previous users. This contact could lead to respiratory infection should the individual subsequently place his hand in close proximity to the nose or mouth before washing his hands or application of a hand sanitizer. 
         [0007]    It is well known that hand washing is the most recommended way of preventing contact of unclean fingers with the eyes, nose and mouth. However, in public situations, it is not possible to promptly wash hands. The U.S. Center for Disease Control and Prevention (CDC) reports that up to 80% of germs are transmitted by the hands, and that doorknobs and grab-bars are one of the worst contributors to this problem. 
         [0008]    A prior art example of a hands-free door application taking into consideration the need for sanitary usage is U.S. Pat. No. 6,289,557 issued to Manson et al. which discloses a sanitary door handle assembly for opening a door. The handle portion is arcuate and having the dished side of the handle generally facing one side of a door. While Mansen et al. discloses a door handle capable of being used hands-free, the technique used to open the door requires the user to position his wrist upon the handle and hand in the space between the handle and door. A sudden jarring of the door from the opposite direction could cause injury. Mansen et al. attempts to address this concern by an embodiment having a spring mechanism  36  to alter the position of the handle relative to the door and free an engaged wrist or forearm if the door is unexpectedly opened. 
         [0009]    Another prior art example is U.S. Pat. 7,810,215 issued to Houis which discloses a sanitary handle for opening a latched door. The handle allows for the cradling of a user&#39;s forearm for the user to impart first a downward force to unlock the latch and thereafter a pulling force to swing open the door. The orientation of the Houis handle requires that the user be in a close enough proximity to the door in order to apply a sufficient vertical force to displace the handle. This handle embodiment would not be suitable for high traffic situations. 
         [0010]    Other devices for manual hands-free opening of a door include a product marketed under the trademark SANI-HANDLE. This device comprises a rigid wing extending at an upward angle away from the door. Because of its stationary design, a user slips his forearm into the wing so that the forearm is essentially parallel with the door face. This design requires the user&#39;s elbow to be close to the door and thus the user is close as well. This proximity to the door can make a user susceptible to injury particularly if the door is swung open from the opposite side while the user is engaging the device. 
         [0011]    The prior art references discussed above are hereby incorporated by reference. 
       SUMMARY OF THE INVENTION 
       [0012]    The purpose of my invention is to provide a door opening mechanism which is simple to use, provides reliable and injury-free operation, and allows a user to avoid grabbing a handle may be contaminated with germs. 
         [0013]    I have discovered that a hands-free device for opening a hinged door is safer for the user when a rotatable arm-bar having a bend portion and distal end is presented where the bend portion and distal end can rotate in a plane perpendicular to the door face. If a door is opened unexpectedly as when someone behind the door swings the hinged door unexpectedly towards a user, a forearm will not be caught in the set space between handle and door face; rather my invention allows the handle to rotate and the bend portion and the distal end of the arm-bar changes its positioning relative to the door face. This rotational aspect of my invention thus prevents injury to the forearm or wrist since the limb is not held in a fixed relation to the door as is with the prior art. 
         [0014]    My invention is a door opener assembly to which a hands-free pulling force can be applied to swing open a hinged door and incorporates an arm-bar which can rotate in a direction perpendicular to the adjacent door face. This rotation is from an initial position in front of a hinged door to a position where the distal end of the arm-bar extends beyond the swinging edge of the door. The arm-bar of the door opener assembly is biased to the initial position so that a user can apply a pulling force to the arm-bar and the biasing will cause the arm-bar to return to the initial position afterwards. Biasing of the arm-bar can be accomplished by techniques known to those having ordinary skill in the art. 
         [0015]    My invention is suitable for opening doors used in high-traffic situations without requiring that a hand be placed on a handle. Rather than using a hand and gripping the handle, the swinging arm-bar of my invention permits a user to place either a wrist or forearm on the arm-bar for providing the necessary pulling force to swing the hinged door open. 
         [0016]    This perpendicular rotation of the distal end of the arm-bar relative to the door face in conjunction with the arm-bar biased to an initial position are critical components of my invention. For example, although the Ward reference discloses a rotatable arm-bar which extends past the swinging edge of a hinged door, it is done so along an arc parallel to the door. The distal end of the arm-bar of the present invention by contrast, displaces along an arc perpendicular to the door. This difference allows a user operating my device to open and walk through the door in a continuous movement. Stated differently, the door handle of Ward will extend past the swinging edge before the user can pass by while my invention will have the arm-bar follow the user. 
         [0017]    High-traffic situations are those where the doors will be opened and closed on a frequent basis. Some examples include doors to office buildings, hotels, department stores, medical buildings, public restrooms, etc. My invention can also be used in low-traffic conditions. 
         [0018]    My invention is designed for a user to be able to peripherally recognize and easily engage the arm-bar without having to concentrate and thereafter be able to disengage from contact quickly and easily. 
         [0019]    My door opener assembly comprises a housing which is operatively attached to the face of a hinged door where a pulling force is required to swing the door open; near the distal edge of the door opposite the hinged side. Extending from the housing is an arm-bar having a general hook shape that is rotatably mounted to the housing. The arm-bar can be constructed of any material that is traditionally suited for handle applications. Preferably, the arm-bar is an integral component made of a rigid plastic or metal such as aluminum, brass or stainless steel so a user&#39;s wrist/forearm will easily slide off the arm-bar as will be discussed later. 
         [0020]    Preferably, the distal end of the arm-bar is generally pointed in a direction parallel to the adjacent door face when the housing is operatively attached to the door. 
         [0021]    Operative attachment means that the location of the housing to the door is suitable for a human to engage the arm-bar while standing and that the location is close to or at the swinging edge (distal edge) of the door to maximize leverage. Attachment in this manner permits the least amount of opening force to pull the door open. Doors typically used in high-traffic situations are well balanced and minimal pulling force is required to open even though the doors are usually constructed of heavy material. These doors typically incorporate the use of horizontal and/or vertical grab bars. Preferably, the door opener assembly will be located above a vertical grab bar or handle which may be present. Attachment of my door opener assembly to a hinged door can be by any means well known in the art. Some examples of acceptable means for attachment include, but are not limited to, threadable engagement, use of an adhesive, or use of suction cups. Finally, operative attachment means not only that the housing can be attached directly to the frame of the door, but can be attached to an intermediate item, such as a vertical grab bar, which in turn is mounted to the frame of the door. 
         [0022]    The arm-bar extending from the housing has a proximal shank portion extending in a vertical direction parallel to the adjacent door face, a bend portion and a distal end. Rotation of the distal end of the arm-bar occurs along a plane perpendicular to the adjacent face of the door while rotation of the shank portion is about its longitudinal axis. 
         [0023]    The arm-bar is biased into an initial or first position as will be discussed later. 
         [0024]    It is to be understood that when my door opener assembly is properly attached to a hinged door, the rotation of the arm-bar is only in a perpendicular plane relative to the adjacent door face. It is to be further understood that the rotation of the arm-bar in a perpendicular plane does not allow for movement of the arm-bar in any other plane such as the movement allowed for by the spring of the Manson et al reference discussed earlier. In order for the door opener assembly of the present invention to function properly, the arm-bar can not move in a direction other than a plane perpendicular to the adjacent door face. Other such movement would undesirably increase the minimal pulling force required to swing open the hinged door. 
         [0025]    The term “perpendicular plane” refers to the arc traveled by the distal end of the arm-bar once the housing is operatively attached to a door. It is to be understood that installation may not result in an arc in a precisely perpendicular plane, but the term should also include a plane which is substantially perpendicular; in other words, a minor deviation therefrom. 
         [0026]    My invention can utilize an arm-bar configuration where either a user&#39;s wrist/forearm is raised into contact with the bend portion from below (designated the ‘n’ configuration) or, more preferably, where the user&#39;s wrist/forearm is lowered into contact and positioned upon the bend portion (designated the ‘u’ configuration). 
         [0027]    Other configurations for my arm-bar could be utilized so long as the distal end of the arm-bar is rotatable in a substantially parallel plane relative to ground level once attached to a hinged door. 
         [0028]    In the more preferred ‘u’ configuration, the bend portion has a top surface which has an appropriate surface area that is comfortable for a human to rest his forearm or wrist upon and to thereafter exert upon a small opening force as will be discussed later. If the top surface area of the bend portion were too small, the force applied by the user would be focused on a limited area of the forearm/wrist which could result in discomfort at the site of engagement. 
         [0029]    An important feature of my invention is the ability of the arm-bar to rotate from an initial position, where the distal end is located in front of the door face between the door face and the user as illustrated in  FIG. 1 , to a releasing position where the distal end is located beyond the vertical swinging edge of the door as the user&#39;s wrist disengages contact with the arm-bar. It should be noted the user can disengage at any point before the releasing position is reached; the releasing position merely refers to the maximum rotation limit of the arm-bar; as illustrated in  FIG. 1 , in the clockwise direction. With respect to the maximum clockwise rotation limit, the term “beyond the swinging edge” refers to the distal end of the arm-bar being located further away from the hinged edge of the door than the swinging edge of the hinged door. 
         [0030]    The distal end preferably is of a general knob configuration having an orientation toward the swinging edge of the door as shown in  FIG. 3 . This preferred knob configuration is conducive for allowing a human&#39;s wrist or forearm to easily slide off the arm-bar without risk of injury or article of clothing becoming snagged. 
         [0031]    In my preferred ‘u’ configuration, when my door opener assembly is operatively attached to a door, the distal end is facing in a general upward direction. Stated another way, the arm-bar has a general hook-shape configuration, except that the bend portion is bent outward as viewed in  FIG. 6 . 
         [0032]    In an alternative ‘n’ configuration, the bend portion, after curving upward, then curves downward so the distal end is eventually facing in a general downward direction, preferably 30-60 degrees from horizontal which permits a user to engage the lower surface of the bend portion by raising his forearm/wrist to contact, and then disengaging at any time by lowering his forearm or, if the arm-bar has rotated clockwise to its maximum extent as the user is walking through the door opening, the user&#39;s wrist/forearm will disengage as it slides away from contact off the distal end. 
         [0033]    An anticipated use of my invention is on commercial doors which will repetitively open and close in high-traffic pedestrian applications. In a typical commercial setting, individuals will be behind the user and others may be on the opposite side of the door desiring to travel in the opposite direction. To prevent injuries, it is necessary that the user be able to immediately remove his wrist or forearm from contact with the arm-bar without any chance that the wrist or forearm could catch in the device which could cause an arm, shoulder or other injury. By example, for my preferred ‘u’ embodiment, the user can release contact with my arm-bar configured for use by a right hand on a right side door by lifting in the +y direction, sliding over the distal end in a −x direction, sliding across the bend portion in the +z direction or any combination of the above. 
         [0034]    The ability to easily disengage from the arm-bar in various directions as a result of the arm-bar geometry and orientation are safety features of this invention. Rather than relying upon a spring mechanism exemplified by the Manson et al. reference to alter the plane of movement for the handle, my invention relies upon the ample spacing between the door and the distal end of the arm-bar for easy, slidable disengagement of a user&#39;s wrist. 
         [0035]    Thus, the design of my arm-bar is sized to permit a user&#39;s forearm/wrist to be quickly positioned into contact with the bend portion and after a subsequent opening force is applied, to thereafter slidably disengage from contact with the arm-bar; i.e. the forearm/wrist displaced from the space formed between the distal end, the bend portion and the shank portion of the arm-bar. 
         [0036]    My invention is usable in both high and low traffic door applications. It provides the user with an option. Although the arm-bar can be grabbed by the hand and used to open a door, my invention is directed toward the user positioning the forearm/wrist across the bend portion. For the ‘u’ configuration, the user&#39;s wrist/forearm is placed upon the bend portion and gravity along with a slight pulling force is used to swing a door open and avoid hand contact with the arm-bar which may have germs deposited by previous users. For the ‘n’ configuration, the user&#39;s wrist/forearm is moved upward into contact with the bend portion and a pulling force is used to swing the door open. 
         [0037]    For the ‘u’ configuration, my arm-bar assembly is positioned at an appropriate height on the door so persons approaching the door assembly can easily lay their wrist or forearm upon the bend portion. In a typical installation, my arm-bar assembly would preferably be positioned upon the door slightly above a vertical grab bar as illustrated in  FIG. 9 . Operative attachment of the housing proximate to the vertical swinging edge of the hinged door permits the distal end of the arm-bar to be rotated perpendicular to the adjacent door surface to a position where the distal end is beyond the outer swinging edge of the door. 
         [0038]    The engagement zone, meaning the distal end and bend portion of the arm-bar, is appropriately sized for a user&#39;s forearm/wrist to contact i.e., not too thin to cause the user discomfort and not too thick so the user&#39;s hand can not rest in the space between the distal end and the shank portion of the arm-bar. In a preferred embodiment, the arm-bar, from its initial position, can easily rotate in either direction to accommodate the user&#39;s wrist/forearm as it is placed upon the bend portion. With gravity resting the user&#39;s forearm upon the arm-bar with the wrist cradled over the bend portion, the user applies a pulling force upon the arm-bar to swing open the door. 
         [0039]    It is to be understood that the pulling force to open the door is applied by the user&#39;s wrist and/or forearm. This pulling force is applied generally to the bend section. As the door swings open, the arm-bar rotates in response to the continued contact of the user with the arm-bar. As this rotational movement occurs and the user continues to walk through the door opening, the wrist/forearm position of the user slidably displaces in a direction toward the user&#39;s body and eventually disengaging contact with the arm-bar. Due to the smoothness and design of the arm-bar, there is nothing upon which the user or the user&#39;s clothing can catch. 
         [0040]    Since most commercial doors are well-balanced with existing door-closing devices, the weight of the persons arm alone provides much of the force required to open the door. With the weight of the user&#39;s arm resting upon the bend portion, for example, ten pounds force downward due to gravity, any pulling force the user exerts toward himself to open the door will be applied to overcome the pull resistance of the door, which in commercial application is typically between 1-7 lbs-force. Thus, the user&#39;s arm weight is used as part of the pulling force for the ‘u’ configuration. 
         [0041]    In the preferred arm-bar design, the shank portion of the arm-bar is cylindrical as it extends vertically from the housing and parallel to the adjacent door surface to about the low point of the bend portion. Extending past this point to the distal end, the bend portion gradually becomes more oblong and larger in shape and, bends towards the swinging edge side of the door. 
         [0042]    The preferred knob design helps to spread the weight of the user&#39;s wrist and forearm over a larger area of the arm-bar. 
         [0043]    The bend in the arm-bar seen in  FIG. 7  towards the swinging edge of the door aids the user&#39;s forearm and wrist to slide easily and smoothly while still providing a level of gripping force to control the door. 
         [0044]    Preferably, overall rotational movement of the distal end of the arm-bar is limited to about 160 degrees. Part of this degree of rotation permits a user to pull the door open and begin to walk through the door opening while still in contact with the arm-bar since the arm-bar is rotating clockwise for a door hinged on the right side. A smaller part of the degree of rotation is provided in case, for example, a child&#39;s head were to accidentally bump the distal end. For these situations, the arm-bar can preferably rotate up to about 20 degrees from the door face in a counterclockwise direction from the initial position. This rotation ability acts much like a shock absorber to dissipate an impact force. 
         [0045]    After the user releases contact to the arm-bar, it is biased to automatically return to the initial position ready for the next user; typically in less than three seconds. Biasing to the initial position can include the use of stretchable material such as natural rubber, synthetic rubber, or the use of coils, springs, leafs, or mechanical, hydraulic or pneumatic devices. 
         [0046]    However, biasing to the initial position can also use of a plurality of magnets to bias or urge a rotating component to one position. Using magnets as part of my door opener assembly, at least two magnets are positioned within the housing to bias the arm-bar to the initial position; one magnet rotating with the arm-bar and the other stationary with the housing. Small magnets simulate push forces, pull forces and forces to maintain the initial position. In a preferred embodiment, one set of magnet(s) are located in the housing to rotate with the shank portion and at least two sets of magnets are located in the housing which remain stationary. Another embodiment can have two sets of magnets rotating and one set stationary. The dynamics of utilizing magnets can be easily modified and fine-tuned and even drastically changed by varying the number of magnets stacked at each position, slightly changing their relative location(s) or even adding additional magnet positions. In one embodiment, one of the members used for position of the magnets can be adapted with a single arced aperture having a plurality of notches whereby the magnet locations can be easily changed to a different position along the arc. 
         [0047]    Use of magnets has benefits of increased reliability, durability and operational flexibility in accordance with the dynamics of the invention. Since the dynamics enhance the comfort, safety and reliability of use, magnets provide an enormous advantage over extension, compression, torsion or other types of springs which are more prone to premature failure relative to magnet usage. 
         [0048]    The use of the magnets will allow easy compensating adjustments which may be required for different arm weights and material changes, such as for example, use of arm-bars constructed from brass rather than from a lighter thermal-plastic material. This consideration would also apply for versions of my invention for down-sizing the size of the arm-bar and support housing for use in more child friendly applications such as elementary schools. 
         [0049]    A further alternative embodiment would have the arm-bar constructed as a composite with the distal end and a segment of the bend portion constructed of a resilient material such as solid rubber or a polymeric material. 
         [0050]    The aforementioned door opener assembly uses a pulling force to swing a door open. Located on the opposite face of a door to which my door opener assembly is operatively attached can be installed a push door opener assembly the type of which is illustrated in  FIGS. 10-12 . The push door opener assembly comprises a housing attached to the door and a shaft extending away upon which a contoured pad is rotatably mounted. The push door opener assembly can be mounted upon the opposite door face and a preferred embodiment permits the contoured pad to be rotated about the attachment axis. Magnets are used for returning the contoured pad to its initial position in a similar way as described for the arm-bar. 
         [0051]    In another application, it may be useful to combine the push and the pull feature on a single door face as illustrated in  FIG. 13 . In still another application, the pull assembly could also be used for opening refrigerator doors, including commercial refrigerator doors. 
         [0052]    A final application of my invention can be utilized in embodiments where movement of the arm-bar by application of a hands-free pulling force causes rotation of the arm-bar to unlock a latch bolt and swing open a hinged door. For this embodiment, the rotation of the arm-bar would be operatively connected to the shaft of the latch mechanism for displacing the latch shaft into the door in response to arm-bar rotation. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0053]      FIG. 1  illustrates a user&#39;s initial forearm and wrist placement upon the arm-bar of the door opener assembly. 
           [0054]      FIG. 2  is a perspective view of one embodiment of the door opener assembly. 
           [0055]      FIG. 3  is a top view showing the relation of the door opener assembly to the door and the rotational movement of the arm-bar. 
           [0056]      FIG. 4  is a top view of one embodiment of my door opener assembly. 
           [0057]      FIG. 5  is a top view of the arm-bar. 
           [0058]      FIG. 6  is a side view of the arm-bar. 
           [0059]      FIG. 7  is a front view of the arm-bar. 
           [0060]      FIG. 8  is a cut-away view of the housing and attachment of the arm-bar in the initial position. 
           [0061]      FIG. 9  illustrates a use for my invention in a commercial double-door application. 
           [0062]      FIG. 10  illustrated a contoured push plate located on the door face opposite the arm-bar. 
           [0063]      FIG. 11  is a perspective view of the contoured push plate. 
           [0064]      FIG. 12  is a side view of the push plate. 
           [0065]      FIG. 13  is an embodiment incorporating both the arm-bar and push plate. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0066]    The illustrations provided are not necessarily to scale but are for general informational purposes.  FIG. 1  generally illustrates the position of a user&#39;s forearm/wrist A in relation to my door opener assembly  10  which is operatively attached to a door D and with arm-bar  14  in the u-configuration. 
         [0067]    Since most high-traffic doors utilize a metal frame and glass, door opener assembly  10  is threadably secured to the door&#39;s metal frame in a position above any existing vertical grab bar. It should be noted however, a version of door opener assembly  10  could include suction cups for attachment to a door where the surface of attachment may or may not be a portion of the door&#39;s metal frame. 
         [0068]    The movement shown in  FIGS. 3 and 4  refer to the movement of an arm-bar attached to a right-side hinged door. The positioning and movement for an arm-bar attached to a left-side hinged door would be the mirror image. 
         [0069]    Referring to  FIG. 2 , the door opener assembly  10  is comprised of two subassemblies, the housing  12  and the arm-bar  14 . Arm-bar  14  comprises a shank portion  20 , a bend portion  22 , and a distal end  24 . The distance between the shank portion  20  and distal end  24  generally defining a gap G as illustrated in  FIG. 6 . 
         [0070]    Arm-bar  14  is rotatably attached to housing  12  with the rotational movement illustrated in  FIG. 3 . The closed position of hinged door D, housing  12 , and the initial position of arm-bar  14  appear in solid line when forearm/wrist A is initially placed upon bend portion  22 . The initial position of arm-bar  14  relative to door D is represented by angle L which is about 40 degrees or about 140 degrees from the swinging edge of the door. In this initial position represented by the solid line in  FIG. 4 , arm-bar  14  is rotatable in either clock-wise or counter-clockwise direction. Overall, the rotational movement of arm-bar  14  is represented by angle M and is about 160 degrees. Referring to  FIG. 3 , the dashed lines represent positions of hinged door D, housing  12  and arm-bar  14  after opening force F has been applied. As the user begins to walk to and through the door opening, the position of arm-bar  14  rotates toward the swinging edge of door D. 
         [0071]    The counter-clockwise position of arm-bar  14  in dashed line in  FIG. 4  represents a possible position if hinged door D is inadvertently bumped by an object such as a child&#39;s head. This rotational movement would lessen the force of impact and minimize any injury. Also, this movement is limited to prevent distal end  24  from impacting the door surface if it is accidently displaced counter-clockwise. 
         [0072]    Located within housing  12  is are magnet sets  30  and  34  located within housing  12  which provide a relatively small biasing force is used to urge arm-bar  14  into the initial position. If the correct magnet strength is used, arm-bar  14  will responsively rotate upon application of force F to swing open door D. 
         [0073]    As a consequence, even an impact such as a child&#39;s head accidentally bumping arm-bar  14  will not suffer an injury. Also, the enlarged dimensions of distal end  24  serve to prevent injury which may otherwise occur if the end had sharp edges. During the installation process of door opener assembly  10  to door D, maintenance personnel will check to ensure the correct magnet strength is used for the particular type of door. Magnets can be changed by removing the cover to housing  12  and inserting the magnets into appropriately sized apertures (not shown) for receiving the magnets into rotatable block  36  and stationary block  32 .  FIG. 8  illustrates the relative position of magnets  30  and  34 . It is to be understood that blocks  32  and  36  are constructed of a non-magnetic material. 
         [0074]    In normal operation, as soon as forearm/wrist A is placed upon bend portion  22 , it exerts a force upon arm-bar  14  caused by its weight. The user thereafter can exert an additional, minimal pulling force F in the direction shown in  FIG. 3  to begin swinging open hinged door D. As door D is swung open, the user moves and begins to walk through the door opening. Relative to the user&#39;s movement and continued engagement to arm-bar  14 , arm-bar  14  rotates in a clockwise direction up to its maximum rotational extent at which continued user movement through the door opening causes forearm/wrist A to slide in direction R until forearm/wrist A completely disengages from contact with arm-bar  14 . 
         [0075]    Mirror-image designs as illustrated in  FIG. 9  are used for adjacent doors (double doors) which are normally used to handle high-traffic situations. It is possible for two persons to simultaneously pull open both doors, although they would have to pay attention not to bump each other. For the situation where a person is exiting via one door and another person is entering thru the other door, there is still adequate room to maneuver. 
         [0076]    My door opener assembly can also be used on a typical aluminum-glass ‘storefront’ door D positioned near or adjacent to the swinging edge. Housing  12  is attached above a vertical grab bar B similar to that illustrated in  FIG. 9  which is commonly used currently, so that the person entering the door has the choice of using grab bar B or arm-bar  14 . 
         [0077]    The limits of travel of arm-bar  14  in each direction are limited by stops  16  and  18  within housing  12  as shown in  FIG. 8 . Within housing  12  is a U channel  50  having a top section  52  and a bottom section  54  each having a hole having a common axis of symmetry with the other. A shoulder bolt  62  is accepted through the holes in top section  52  and bottom section  54  and threadably secured to threaded hole  60  located at the top of shank portion  20 . The head of shoulder bolt  62  rests upon a thrust bearing (not shown) partially positioned in the annular region of top section  52  to secure arm-bar  14  to housing  12 . A washer bearing (not shown) is positioned in the annular region of bottom section  54  for centering the base of shoulder bolt  62 . 
         [0078]    As illustrated in  FIG. 8 , a rotor assembly is provided in housing  12  which include stationary magnets  30  disposed in respective recesses in block  32  and traveling magnet  34  disposed in a recess in rotatable block  36  which is secured to the proximal end of shank portion  20  by screw  38 . A stop pin  40  is also secured to the proximal end  26  of shank portion  20  by screw  42  located on the rotating part of the mechanism makes contact with stops  16  and  18  to define the extent of rotation M of arm-bar  14 .  FIG. 4  also shows the extent of travel of rotatable block  36  and traveling magnet  34  in the clockwise direction as  36 ′ and  34 ′ respectively. 
         [0079]    It should be noted that a small space exists between the adjacent faces of block  32  and rotatable block  36  so that rotatable block  36  does not frictionally engage. 
         [0080]    The use of magnets  30  and  34  in housing  12  bias arm-bar  14  into the initial position and provides a smooth continuous rotational movement once the user has placed forearm/wrist A upon arm-bar  14  and begins to exert a pulling force F. 
         [0081]    The exact sequence for rotation of arm-bar  14  and opening of door D depends on the position of the user, their change of position and the movement of their forearm/wrist A. 
         [0082]    If, for example, a person were to stand directly in front of housing  12 , rest forearm/wrist A upon bend portion  22  and exert a pulling force F without moving his feet, arm-bar  14  would first move from its initial position and point at the person, being then approximately perpendicular to the adjacent face of door D. If the user were to take a step directly backward, which would further cause forearm/wrist A to pull on door D, the door would open further and the angle would decrease some and the arm bar would actually rotate toward and then past the swinging edge of the door, as seen by a person standing behind the user. The user could then step to the left to begin their entry thru the door. At this point, if the door opening was sufficiently wide, wrist/forearm A would naturally slide off the smooth arm-bar  14  in direction R as illustrated in  FIG. 3  as the user moves further through the door opening. 
         [0083]    The user&#39;s engagement of forearm/wrist A to arm-bar  14  can be as short as the time it takes to complete application of opening force F or, the engagement time can be delayed considerably and the person can in essence ‘walk the bar’ i.e. continue engagement to arm-bar  14  until the user is moving through the door opening. 
         [0084]    Another method for opening swinging door D is by a user giving arm-bar  14  a hard yank, causing door D to swing open without moving from their initial position. As the door opens rapidly, the arm-bar  14  will quickly rotate and will again allow the slide release of the user&#39;s arm. 
         [0085]    After a person has used the invention a couple of times, the operation becomes smooth, where the user&#39;s position and the pull angle are changing continually. Thus, the users arm typically enters and rests in the arm bar as shown in  FIG. 1 , and is released typically by the slide action as shown in  FIG. 3 . 
         [0086]    In a most preferred embodiment of my invention, the arm-bar has a configuration as shown in  FIG. 6  in accordance with the dimensions listed in the following table: 
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Circumference of Arm-Bar and degrees from Vertical 
               
             
          
           
               
                   
                 Section 
                 Circumference (in) 
                 degrees from vertical 
               
               
                   
                   
               
             
          
           
               
                   
                 A-A 
                 2.945 
                  0-90 
               
               
                   
                 B-B 
                 3.14 
                  90-120 
               
               
                   
                 C-C 
                 4.28 
                 120-150 
               
               
                   
                 D-D 
                 5.12 
                 150-165 
               
               
                   
                   
               
             
          
         
       
     
         [0087]      FIGS. 6 and 7  also present additional dimensions W and X where W is about 5.9 inches and X is about 1.8 inches. It should be understood that for doors usable primarily by children, an arm-bar can be designed with smaller measurements than those described above for adults. 
         [0088]      FIGS. 10-13  illustrate embodiments which utilize a push door opener assembly  80  which comprises contoured pad  82  rotatably mounted to mount  84  which is attached to door D. The push door opener assembly  82  can be constructed of any durable material but is preferably constructed of hard plastic, or a metal such as aluminum, brass or stainless steel. Assembly  80  can be mounted upon the door face opposite door opener assembly  10  either directly to the door face or to mounting bar  84  as shown in  FIG. 10  or it can be configured to part of the door opener assembly as illustrated in  FIG. 13 . It should be noted that contoured pad  82  is weighted so that gravity will assist in returning to its initial position. Also, magnets are also used to assist in biasing in the initial position. Contoured pad  82  can be rotated 360 degrees. Rotation of contoured pad permits a more comfortable engagement since the user, once having their forearm cradled in contoured pad  82 , can rotate to any desired position as illustrated in  FIG. 10 .