in the description herein for embodiments of the present invention , numerous specific details are provided , such as examples of components and / or mechanisms , to provide a thorough understanding of embodiments of the present invention . one skilled in the relevant art will recognize , however , that an embodiment of the present invention can be practiced without one or more of the specific details , or with other apparatus , systems , assemblies , methods , components , materials , parts , and / or the like . in other instances , well - known structures , materials , or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention . embodiments of the present invention relate to an exercising apparatus designed to fit around a seat . various embodiments of the invention provide an exercising apparatus that includes a frame , one or more arms and one or more resistance devices . the frame is secured to a support . the frame has a u - shaped configuration to receive a seat into the frame . the arms are pivotally coupled to the frame at one or more pivots . a pivotal motion is provided to each of the arms about the pivots with the frame , when a user exerts a directional force on the arms . the resistance devices are coupled to the frame and the arms and provide resistance to the pivotal motion . retraction devices return the arms to their initial positions after they have been moved by the user . reference will now be made in detail to several embodiments of the invention that are illustrated in the accompanying drawings . wherever feasible and convenient , same reference numerals are used in the figures and the description to refer to the same or like parts . the drawings are in a simplified form and not to scale . for purposes of convenience and clarity only , directional terms , such as top , bottom , left , right , up , down , over , above , below , beneath , rear , and front may be used with respect to the drawings . these and similar directional terms should not be strictly construed to limit the scope of the invention . in addition , words such as couple , connect , and similar terms with their inflectional morphemes are used interchangeably , unless the difference is noted or made otherwise clear from the context . these words and expressions do not necessarily signify direct connections , but include connections through mediate components and devices . fig1 - 3 illustrate the configuration of the exercise apparatus designed to fit around a toilet seat and be operated by a user while sitting on this seat . fig4 - 8 show the configuration of the exercise apparatus designed to be operated by a person while sitting in a wheelchair . the two configurations are similar in many respects and , in particular , they are similar with respect to the aspects , features and mechanisms to which the present invention relates . generally , the first configuration shown in fig1 - 3 comprises a frame 102 adapted to surround a toilet and be attached to a wall by brackets 201 a and 201 b directly behind the toilet . the brackets can be adjustable , for example , in the manner shown in fig1 . in this arrangement , a tubular member 202 a is fitted within the frame tube 102 and is adjustably fixed therein by an expansion joint 203 a . the opposite end of the tube 202 a is attached to the bracket 204 a which , in turn , is attached to the wall . returning to fig1 - 3 , it may be seen that the exercise apparatus comprises arms 103 a and 103 b which are pivoted with respect to a tubular portion of the frame 102 by pivot joints 105 a and 105 b , respectively . the structure of each pivot joint will be described below in connection with fig9 . the spacing between the arms 103 a and 103 b may be adjusted by loosening screws 109 a in the pivot joint and rotating the arms about their axis which passes through the pivot joints and then retightening the screws . handgrip members 104 a and 104 b are provided and , as shown in fig2 , can be extended upward or downward with respect to the arms 103 a and 103 b , respectively , in which they are coaxially inserted . this extension affords an additional mode of exercise for the user . as will be described below in connection with fig9 , a resistance device is provided within each arm to act against the force applied by the user to extend or retract the handgrip member . in addition , it may be seen that the handgrip members 104 a and 104 b may be rotated in position either toward or away from the user . when the handgrip members are in their retracted position , as shown by solid lines in fig2 , they are prevented from rotating about the longitudinal axis of the arm by interlocked mating portions of the tube sections 106 a and 106 b . fig3 shows a piston and cylinder device 301 a which provides resistance to the force applied by the user to the arm 103 a . this resistance device is attached at one end to a tubular portion of the frame 102 and is attached at the opposite end to a mechanism for adjusting the distance from a control point to the pivot joint 105 a of the arm 103 a . the mechanism , comprising elements 401 a , 403 a , 404 a and 405 a will be described below in connection with fig1 . the movement of the arm 103 a about the pivot joint 105 a is limited by the path of travel of the piston within the cylinder 301 a . this path of travel , which is shown in fig3 as an 85 ° arc from the vertical to the forward position , may be adjusted and limited by adjusting the position of a thumbscrew 306 a . this mechanism for adjusting the limit of travel of the arm will be described in detail below in connection with fig1 and 14 . suffice it to say , at this point , that the arc of movement of the arm is limited by the piston and cylinder at both ends of its travel : from the vertical to a position away from the vertical that is selectable by the user . fig7 shows how a user , who in this case sits in a wheelchair , may exercise by moving the arms up and down . fig6 shows how the user may exercise by moving the arm 103 a forward . fig8 shows how a user may operate the exercise device with the direction of the wheelchair reversed within the apparatus . fig9 and 9 a illustrate with arrangement which enables the handgrip member 104 a to move axially upward and downward ( or outward and inward ) with respect to the arm 103 a . as is shown here , the downwardly extending portion of the handgrip 104 a is connected by a sleeve 507 a to a co - axial stem 506 a which slides within the tube of the arm 103 a . the stem 506 a is maintained in alignment with the arm tube 103 a by a teflon coated piston 504 a which slides within the tube 103 a . a piston / cylinder arrangement 502 a is connected between the arm 103 a and the stem 506 a of the handgrip member 104 a by means of coupling devices 501 a and 503 a , respectively . fig9 also shows the structure of the pivot joint 105 a . as is illustrated there , the pivot joint comprises a casing 105 a having first and second openings , accommodating the tubular portions of the arm 103 a and the frame 102 , respectively . these tubular portions are held in place by set screws 108 a and 109 a which clamp the casing tightly about the arm and frame , respectively . the two portions of the casing 112 a and 114 a are rotatable with respect to each other about a central axle formed by a screw 116 a , fixed in position by the set screw 118 a . fig1 shows the arrangement of a piston and cylinder 301 a with an internal spring 303 a which serves as the combined resistance and retraction device of the exercise apparatus . this device 301 a is pivotally attached to the frame at one end 309 a and pivotally attached to a resistance force adjusting device at its opposite end 308 a . the oil within the cylinder flows freely past the piston when the piston travels on one direction ( the retraction direction ) but is partially blocked when the piston travels in the opposite direction ( the resistance direction ). motion of the piston is limited at the end of its travel within the cylinder by a locking screw 306 a , which may be adjusted in position at the frame - connected end of the cylinder . fig1 shows the mechanism for adjusting the leverage of the piston and cylinder 301 a that provides both the resistance force and retraction force applied to the arm 102 a . this mechanism comprises two parallel bars 403 a and 404 a which are pivoted with respect to the arm 102 a and the cylinder 301 a at points 408 a and 308 a , respectively . the bars are maintained in parallel relationship by a pin 405 a and a threaded bolt 402 a having a knob 401 a at the top . the pin 405 a is rigidly connected to the upper bar 403 a but slides in an opening within the lower bar 404 a . the bolt 402 a has a mating screw thread with the upper bar 405 a , and is rotatably retained by flanges 407 a in an opening in the lower bar 404 a . when the knob 401 a is rotated , turning the bolt 402 a , the distance between the upper and lower bars is either increased or reduced , depending upon the direction of rotation . since the upper bar is fixed with respect to the arm at the pivot point 408 a , such knob rotation changes the distance of the lower bar 404 a from the pivot joint 105 a , thus changing the length of the lever arm of the piston / cylinder 301 a . fig1 and 14 show in detail the locking mechanism for limiting range of arm movement in the first embodiment ( fig1 ) and second embodiment ( fig1 ), respectively . as explained previously in connection with fig1 , the locking screw 306 a may be moved either to the right or to the left along a slot 311 a and set to limit the end travel of the piston , thus limiting the end travel of the arm 103 a . finally , fig1 a - 15 d show the mating surfaces of the upper and lower tubes 106 a and 107 a , respectively , which constrain the angular position of the handgrip member . fig1 a and 15 b show the parts as separate , whereas fig1 c and 15 d show the parts in mating relationship . as indicated in fig1 d , the tubes are fastened to the arm and handgrip member , respectively , by pins 108 a . fig1 e shows the lower tube 107 a in isometric view , making visible the mating surface 152 ( also identified in fig1 a and 15 b , respectively ). the mating surface 152 of the tube member 107 a has a vertical slot which prevents the handgrip member from rotating when the upper tube member 106 a is in mating relationship with this lower tube member . this constrains the handgrip member to be either in one of two angular positions which are separated by 180 ° with respect to each other . there has thus been shown and described a novel exercising apparatus which fulfills all the objects and advantages sought therefor . many changes , modifications , variations and other uses and applications of the subject invention will , however , become apparent to those skilled in the art after considering this specification and the accompanying drawings which disclose the preferred embodiments thereof . all such changes , modifications , variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention , which is to be limited only by the claims which follow .
an exercising apparatus designed to fit around a seat includes a frame that is adapted to be secured to a support . the frame is a u - shaped configuration with a lateral open area to receive the seat into the frame . one or more arms are coupled to the frame about one or more pivots . further , the pivots allow a pivotal motion of each of the arms when a force is exerted thereto by a user . one or more resistance devices coupled to the frame and the arms , which provide resistance to the pivotal motion of each of the arms . the resistance devices , which may be a hydraulic or pneumatic piston and cylinder , may include a spring to bias the arms toward their initial , upright position .