Abstract:
A control lever having one end adapted for attachment to a resting device for controlling movement thereof, and another end having a tactile contour for identifying said control lever.

Description:
FIELD OF INVENTION 
   The present invention relates to a control lever having one end adapted for attachment to a resting device such as a chair and another end having a tactile contour for identifying the control lever. The invention also relates to a chair having a plurality of levers where each of said levers have a different tactile contour for distinguishing the levers. A guide is associated with said plurality of levers having different tactile shapes. The invention also relates to a method of correlating a plurality of lever control arms with respective corresponding plurality of movements of a chair, using a guide. 
   BACKGROUND TO THE INVENTION 
   Resting devices such as a chair or bed may be adjusted to fit the comfort of an individual user. 
   Contemporary chairs particularly utilised in an office are becoming more sophisticated with respect to the different adjustments that can be made to these types of chairs. Typically such chairs provide that both the back and the seat of the office chair can be separately adjusted to a number of different settings by utilising a plurality of chair lever control arms. Generally speaking, all chair lever control arms or controls are generally located below the chair seat. This is generally the case for adjustable beds of the type having control arms located below the bed. 
   A particular draw back of such prior art chairs resides in the likelihood that understanding of the use of the controls is often difficult. Much of the difficulty results from the positioning of the lever control arms below the chair seat where they are not readily visibly assessable. 
   Accordingly, it is not unusual that the operation of most chair controls is understood after a trial and error test done by a person using the chair. Such person will generally try each control to determine its function and may reach a full understanding of the chair controls only after extended chair usage. This can be frustrating as the chair control arms can move a chair part, which has already been set to an appropriate optimal position, and require resetting. In some case, such person may not be able to properly reset the chair for optimal usage. 
   In other cases movement of the lever control arms or devices without an understanding of its function can lead to adjustment of the chair parts which is inappropriate. For example, some chairs are equipped with a tension device that is rotatable and adjusts the tension on the “free float” tilting motion of the chair. This “free float’ motion may be locked (i.e. prohibits the swing) or unlocked by a chair lever arm. If the tension is adjusted for a heavy person and a light person sits on the chair it is possible that the light person may be catapulted forward by the spring activated movement when the lever arm is unlocked. 
   Accordingly, various prior art devices have heretofore been constructed in order to address the difficulties referred to above. 
   For example, reissue U.S. Pat. Re. 36,928 relates to an operational guide mounted to an adjustable chair where the guide includes a card having a pictorial guide for operating the adjustable chair located on the top side of the card. 
   Moreover, some prior art chairs included lever control arms having an end with a serrated edge along one side thereof. 
   In other cases, Braille has been disposed on a top surface of a lever control arm in order to permit a blind person to locate the particular lever control arm and convey information regarding same. 
   However, it is difficult for the general public to decipher the meaning of a serrated edge or Braille disposed on a lever control arm. Furthermore it is generally difficult to visually represent a serrated edge or Braille on a screen or guide which is easy to see or understand. 
   Moreover the prior art devices have not addressed the issue of assisting a user to understand the operation of a lever control arm, apart from providing an instructional manual in a booklet of written form. In some prior art devices summaries of instructions are provided on a card as shown in U.S. Pat. No. Re. 36,928 or card pivoting outwardly from an arm of a chair. 
   According, it is an object of this invention to provide an improved lever control arm for a chair, which is more easily and readily understood by the general public. 
   It is a further object of this invention to provide an improved chair having control levers for adjusting a chair having an improved method of conveying information concerning its functionality. 
   It is an aspect of this invention to provide a control lever having one end adapted for attachment to a resting device for controlled adjustment thereof and another end having a tactile contour for identifying the control lever. 
   It is another aspect of this invention to provide a plurality of levers each having one end adapted for attachment below a chair seat or controlling separate movements of a chair, each said lever having another end having tactile shapes different from one another so as to distinguish said levers. 
   It is another aspect of this invention to provide a chair having a selectively moveable back and seat and a plurality of control arms attached below said seat for activating selected movements of said back and seat wherein said one of said control arms includes an end having a tactile shape different from an end of another one of said control arms. 
   It is another aspect of this invention to provide a chair having a selectively moveable back and seat including a first lever control arm having one end attached below the seat and another end presenting a tactile shape, said first lever arm activating a selected movement of said back or seat; a second lever control arm having one end attached below said seat and another end presenting a tactile shape, said second lever control arm activating another selected movement of said back or seat different from said first lever control arm; said tactile shape of said second lever arm different from said tactile shape of said first lever arm; and a guide presented by the arm of the chair for displaying the different tactile shapes and the associated movements of said first and second lever control arms. 
   It is another aspect of this invention to provide a guide for a chair having a plurality of lever control arms with ends having different tactile shapes, for activating a selective orientation of a back or seat of a chair comprising: a screen having visual representations corresponding to each said different tactile shapes; information associated with said visual representations and corresponding to selective orientations activated by said plurality of lever control arms respectively. 
   It is another aspect of this invention to provide a method of correlating a plurality of separate movements of a chair with a plurality of lever control arms activating said movements respectively comprising the steps of: providing a plurality of lever control arms with ends having different tactile contour shapes; displaying a guide having said shapes with information associated with said movements of said plurality of lever control arms respectively. 
   These and other objects and features of the invention shall now be described in relation to the following drawings. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
       FIG. 1  is the rear perspective view of an office type chair having moveable chair parts and controls for those moveable chair parts. The chair shown in  FIG. 1  is of a conventional design and is labelled as prior art. 
       FIG. 2  is a perspective view of a chair and a display or control guide according to one preferred embodiment of the present invention. 
       FIG. 3  is an enlarged perspective view of the armrest from the chair of  FIG. 2  according to a further preferred embodiment of the present invention. 
       FIG. 4  is an enlarged perspective view of the control lever arms removed from the chair  FIG. 2 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   In the description that follows, like parts are marked throughout the specification and drawings with the same respective reference numerals. The drawings are not necessarily to scale and in some instances proportions may have been exaggerated in order to more clearly depict certain features of the invention. 
   DESCRIPTION OF THE PRIOR ART 
     FIG. 1  shows a typical example of a prior art office type chair  1 . The chair includes a chair back  3 , a chair seat  5 , and a support frame  8  which includes a vertical column  7  and a frame  9  which supports the chair  1 . 
   The back  3  and seat  5  of the chair  1  are adjustable to different positions. For example, the chair back  3  may be vertically adjusted at an angle relative to the seat  5 . Moreover the seat  5  may be adjusted relative the horizontal. Furthermore, the height of the seat  5  may also be adjusted from ground level, in a manner well known to persons skilled in the art. Furthermore, other parts of the chair may also be adjustable. 
   The different adjustments or movements of each of the above chair parts is activated by a number of control levers or chair lever control arms  11 . Generally speaking prior art lever control arms  13 ,  15 , and  17  are identically shaped. Generally speaking the prior art devices comprise lever arms  13 ,  15 , and  17  having a substantially flat circular paddle at one end of the lever arm as shown. Furthermore they generally lie in substantially planar side-by-side relationship in close proximity to one another. 
   Accordingly, a user will generally have difficulty distinguishing one control arm  13  from the others  15  and  17 . Generally speaking the user will need to operate the control to determine which chair part is controlled by the respective control lever  13 ,  15 , and  17 . If the correct chair control lever  11  is not chosen, difficulties may arise as described above. 
     FIG. 2  shows a chair  41  according to one preferred embodiment of the present invention. The chair  41  includes a back  43  and a seat  45  with a lower frame  46 . The lower frame  46  includes height adjustment means  47  and a frame  48  to which the seat  45  is attached and supported. 
   The height adjustment means  47  can comprise of a number of devices including telescoping cylinders which comprise a gas cylinder for adjusting the height of the seat  45  relative to the floor in a manner well known to those persons skilled in the art. 
   A plurality of control levers or lever control arms  49  are disposed below the seat  45 . In particular, the plurality of lever control arms  49  extend from the frame part  48 . Three lever control arms  52 ,  54  and  56  are shown although any number of lever control arms may be utilised. Each of the lever control arms  52 ,  54  and  56  present one end  59 ,  61  and  63  respectively which are adapted for attachment to the chair. In particular, the one end  59 ,  61  and  63  of the lever control arms  52 ,  54  and  56  respectively extend from the frame part  48  and are fastened to the appropriate adjustment mechanisms not shown but well known to those persons skilled in the art. For example, the one end  59 ,  61  and  63  of the lever control arms  49  may be snapped on or virtually engaged by the appropriate adjustment mechanisms. 
   The other end  53 ,  55 ,  57  of the lever control arm  52 ,  54  and  56  respectively have a shape or tactile contour for identifying the control levers  49 . In particular, each of the other ends  53 ,  55 ,  57  of the control levers  49  have a tactile contour which is different from one another so as to easily and readily distinguish the lever. The geometric shapes shown in the drawings, namely the circle, square and triangle are easily and readily distinguishable from one another by tactile contact with a users fingers (since the levers are located below the seat and out of view) in a way which has not been done before, either by serrated edge, Braille, or otherwise. 
   Each of the tactile contours  53 ,  55  and  57  are substantially flat or planar and define a substantially two-dimensional tactile shape for identifying the control levers  49 . In particular, the tactile shapes  53 ,  55  and  57  are planer having a peripheral edge  65 ,  67  and  69  defining the shapes. The peripheral edges  65 ,  67  and  69  may be flat, smooth or curved. 
   The tactile contours or shapes  53 ,  55  and  57  as shown in the figures are disposed substantially horizontally relative to the chair  41  and seat  45  although they can also be disposed substantially vertically or other orientation relative to the chair  41 . 
   The shapes of the other end  53 ,  55  and  57  of the control levers  49  are in one embodiment selected from the group of circular, rectangular, triangular, square, oval or half-circular shapes. However other geometrical shapes, letters or symbols can be selected such as an arrow which may be oriented upwardly or downwardly to convey a selected message. Generally, this group defines planer shapes. The invention should not be limited to the shapes belonging to this group, as the group has been included as an example only. Any tactile contour shape can be selected so long as it is easily and readily distinguished by a person&#39;s tactile feel by the fingers or the like. It is possible that 3-dimensional shapes such as spheres, pyramids or cubes could be utilised, although it has been found that planer 2-dimensional shapes as described are easily distinguishable by touch or feel. 
   Furthermore these shapes are in one embodiment disposed in two dimensional space, with a depth (i.e. third dimension) defining a peripheral edge  39 ,  41 , and  43  of tactile contour  53 ,  55 , and  57  of lever arms  52 ,  54 , and  56  respectively. 
   In one embodiment the tactile contours are defined and perceived by a user operably contacting the peripheral edge  39 ,  41 , and  43  which define the shapes  53 ,  55 , and  57 . 
   Alternatively the planar surfaces S, T, C of tactile contours  53 ,  55 , and  57  may be contoured. For example S may have a smooth surface, while T may be stippled and C being concave, provided such surface is capable of tactile perception and can be visually perceived and in one embodiment represented by indicia such as a visual symbol or in writing. 
   Accordingly, the user of a chair is able to reach down and grasp any of the lever control arms  49  and recognise the distinctive shapes or contours that has been grasped as either circular, triangular, square, half-circular, rectangular, oval or the like. As such, the person may then activate the appropriate control lever to adjust or move the respective response in adjusting or moving the seat  45  or back  43  of the chair. 
   Such user may then easily remember the particular function of the lever control arms  49  after a few uses as the tactile contours have different shapes. The geometric shapes shown in the figures i.e. circle, triangle, and square are easily remembered. 
   Furthermore the side to side spacing can be selected to permit unobstructed manipulation without interference from the other control arms by a users fingers. 
   A person can in accordance with another embodiment of this invention, utilise a display or control guide With the invention described above to determine what the particular control lever will do from the shape of the tactile contour. 
   More specifically,  FIG. 2  shows a control guide or display  65  may comprise a computer monitor, which is associated with the plurality of levers  49 . The computer monitor  65  may be disposed in the vicinity of the chair  41  so that a person sitting in the chair  41  can easily view the monitor screen, which will show or visually display representations of all of the shapes embraced by the tactile shapes  53 ,  55  and  57 . 
   In the embodiment shown the computer screen  66  will visually illustrate a circular, triangular and square representation. In one embodiment, the circular shape will appear at the top of the screen, while the triangular shape will appear at the middle of the screen, and the square shape appear at the bottom of the screen. Each of the shapes will have associated therewith on the screen information pertinent to the control having the particular shape. 
   For example, the circular shape  57  is shown on the computer monitor  65  with indicia or information  85  beside it that the circular shape lever control arm  49  will tilt the chair back  43  vertically relative to the seat  45 . The triangular tactile shape  55  will also appear on the computer monitor  65  with indicia or information  83  beside it that the triangular lever will move the seat  45  at an angle to the horizon. The square tactile shape  53  will appear on the computer monitor  65  with indicia or information  77  beside it that activating the lever  49  will move the seat  45  vertically, upwardly or downwardly relative to a surface. 
   Accordingly, a person using the chair  41  could then refer to the visual shapes described above on the monitor screen and reach down and feel for the particular control arm  49  that they need to make a particular chair adjustment. 
   In another embodiment, the control guide information  77 ,  83 , and  85  may be on a website, which could be accessed by the user. Alternatively, the control guide  65  may comprise of written information obtained in a booklet  67 , which can be stored in association with the chair as shown. Such booklet  67  may have pictures of the various different shapes and information concerning the operation and adjustment of each of the controls according to the shape of the handles. 
   In another embodiment, the control guide  65  may be an audible rather than a visual guide. The user of the chair  41  can access this information by pressing a switch  33 , which may be disposed on the arm  71  and an audible recording which has been stored on, in or in association with the chair  41 , will then be activated and heard through an audio output such as a speaker  70  provided in the back of the chair or other location. Appropriate wires (not shown) and power supplies (not shown) can be provided to activate the audio information. Alternatively, the switch  33  may activate the speaker  70  by wireless means. 
     FIG. 3  shows still another embodiment of the invention in which the control guide or display  65  is carried or provided in the armrest  71  of the chair. The display is electronic in one embodiment. The display or control guide  65  is presented on the upper surface of the armrest  71  and in one embodiment will be visible at all times. The control guide  65  can comprise of a liquid crystal display screen or other electronic screen, which can display the shapes of the tactile contours and include information concerning the various functions of the levers  49 . The display  65  can also comprise of buttons  57 ,  55  and  53  which correspond to the shape of the tactile contours which in one embodiment can be pressed so as to provide information  79 ,  83 , and  87  respectively. Information  79 ,  83  and  87  corresponding to the levers  49  having the contour shapes  57 ,  55  and  53  are displayed in association therewith as shown in  FIG. 3 . 
   Alternatively, the visual representation  57 ,  55  and  53  can comprise of a visual electronic image, which is active by the touch of a finger that changes the electronic characteristics such as inductance or the like to turn on the written information  79 ,  83  and  87  respectively. 
   Alternatively the shapes of the buttons  57 ,  55 ,  53  may be embossed printed or recessed into the material of the arm rest during the fabricating or moulding step which buttons could include the words “RAISE”, “LOWER” and “TILT” for example embossed, printed or recessed inside or close to the buttons to act as a guide to the user of the chair. This would act as a guide to the user feeling the lever arms and looking at the shapes on the armrest to prompt the user as to the function of the appropriate lever arm. 
   Furthermore by utilising the easily recognisable tactile shapes as described in association with shapes that are easily visually represented on a guide such as a computer screen or electronic display on a chair arm (where resolution may be limited) the user can select the appropriate lever arm for the desired movement of the chair. These advantages are not readily available on those prior art chairs utilising a serrated edge on a lever arm (i.e. pixel size of the screen may not permit visual representation of a serrated edge, particularly to someone with poor eyesight) or Braille on the surface of a lever arm. 
   In one embodiment shown in  FIGS. 2 and 3  the order or sequence is the same on the display  65  as on the levers  57   55  and  53  to assist in remembering and operation. In other words the visual appearance or order of the buttons  57 ,  55  and  53  on the display  65  is the same as the order of the tactile contours  57 ,  55  and  53 . However the invention is not to be limited to this particular order as benefits can be experienced with the sequence of the lever arms being different from the buttons. 
   Although not shown it is possible that a hinged cover can be attached to the upper surface of the armrest  71  so as to cover the display or the control guide  65 . The information  77 ,  83  and  85  is more visually accessible to the user of the chair  41  than the controls, which are located below the chair seat. The user of the chair  41  is able to simply reach down to feel the tactile shape of the ends of the lever control arms  49  which are readily recognisable to the touch of the user and then the user can refer to the control guide  65  to determine which lever control activates which part of the chair. 
   Although the invention has been described herein with lever control arms  49 , which are substantially of the same length, such lever control arms  49  may have different lengths. 
   The information to be displayed can be selected to include basic instructions concerning the operation of the lever control arms  49  or the literal information can scroll across the screen to provide full operational information concerning the chair as well as the lever control arms  49 . 
   Although only three lever control arms  49  have been described a plurality of lever control arms can be utilised. Alternatively, at least two lever control arms can be utilised in accordance with the invention described herein. As described above, each of the levers  52 ,  54  and  56  are associated with a control guide or display  65 , which display includes a visual representation corresponding to the shape and information corresponding to the separate movements of the chair. Furthermore it is also possible that one or more control arms  49  be disposed on both side of the seat  45 . 
   The display  65  has indicia  77 ,  83  and  85  for correlating the different tactile shapes of the control means and their associated movements. 
   The invention described herein shows a chair  41  having a selectively moveable back  43  and seat  45  including:
         (a) a first lever control arm  52  having one end  59  attach below the seat  45  and another end  53  presenting a tactile shape, said first lever arm  52  activating a selective movement of the back  43  or seat  45 ;   (b) a second lever control arm  54  having one end  61  attach below the seat  45  and another end  55  presenting a tactile shape, said second lever arm  54  activating another selective movement of the back  43  or seat  45  different from the first lever control arm  52 ;   (c) the tactile shape  55  of the second lever arm  54  is different from the tactile shape  53  of the first lever arm  52 ;   (d) a display  65  presented by the arm of the chair  41  for displaying the different tactile shapes and indicia from the associated movements of the first and second lever control arms.       

   The invention described above also illustrates a display  65  for a chair  41  having a plurality of lever control arms  52 ,  54  and  56  for activating a selected orientation of the back  43  or a seat  45  of the chair  41  comprising:
         (a) a screen  66  having visual representations corresponding to each of the different tactile shapes; and   (b) information  79 ,  83  and  87  associated with the visual representations and corresponding to the selected orientations activated by the plurality of lever control arms respectively.       

   Finally the invention described herein illustrates a method of correlating the plurality of movements of a chair with a plurality of lever chair control arms  49  respectively comprising the steps of:
         (a) providing a plurality of lever control arms having ends with different tactile contour shapes;   (b) displaying a guide having the shapes with information associated with said movements of said plurality of level control arms respectively.       

   Although the preferred embodiment as well as the operation in use have been specifically described in relation to the drawings, it should be understood variations of the preferred embodiment can be achieved by a person skilled in the trade without departing from the spirit of the invention as claimed herein.