Library Collections: Document: Full Text


Patent For Invalid-Chair

Creator: Sarah A. Potter (patent holder)
Date: December 25, 1894
Source: United States Patent and Trademark Office
Figures From This Artifact: Figure 2  Figure 3

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70 designates the two arms of the chair, each of said arms being pivotally connected at its front end-portion to the upper end of the corresponding one of two standards 70a which rise from the front of the bottom-frame 1, at opposite sides of the same. The upper ends of the standards 70a are pivoted between two pendent lugs 70b which are secured to the under side of the front end of each arm 70. The rear end of each arm 70 is pivotally connected to the side of the back-frame 17 by the stud 61a; these studs projecting outwardly from the plates 71, which are secured to opposite sides of the back frame and near its lower end.

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In order to enable the rear ends of the arms 70 to be raised or lowered, a vertical series of openings 72 is formed in each side of the back-frame 17, and the plates 71, are adapted to be adjusted vertically, the screws or pins securing said plates being adapted to enter one or another of these openings 72, so that the rear ends of the arms may be raised or lowered as required. The front ends of the arms 70 are also arranged to be raised and lowered, and for this purpose the lower end of each standard 70a is formed with a vertical series of holes 72a into one or another of which is inserted a pivot-pin 61, which also enters the front of the seat-frame.

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In order to permit the required backward and forward adjustment of the back-frame 17 of the chair, a bar 62 is pivoted at its front end between two pendent lugs 63 which are secured to the under side of one of the arms 70. This arm is serrated on its upper edge to engage a pendent knife -- edged stud 74 which is secured upon the corresponding side of the back-frame 17. A cam-wheel is journaled upon the stud 73a in the lower part of the corresponding side of the back-frame 17, and directly beneath the rear end of the bar 62. This cam carries a handle 73, and it will be seen that after the back-frame 17 has been adjusted as desired, the cam is turned by means of its lever 73, so as to lift the bar 62 upward into engagement with the stud 74.

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Across the front of the bottom-frame 1 extends a horizontal rod 24 the ends and middle of which extend through suitable loops or eyes 25. The end and middle portions of this rod are embraced by the upper hooked ends 26 of four supporting-rods 27 for the two leg rests or supports 28 of the chair. These leg rests or supports are each of oblong rectangular form, and the body-portions are composed of braided cane or other suitable material, and the frame of each support or rest is composed of a horizontal top-bar and two vertical side-bars 29. The side-bars 29 are hollow or tubular bars, and the supporting-arms 27 extend into the side-bars 29 through the upper ends of the same. A set-screw 30 is inserted into the outer side of each outer bar 29, near the upper end thereof, and the inner ends of these set-screws impinge upon the outer sides of the outer supporting-arms 27. The arrangement is such that the leg rests or supports 28 can be set higher up or lower down upon the supporting arms 27 so that the occupant's feet shall rest properly upon the foot-rests, whether the occupant's limbs be longer or shorter.

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31 designates the two foot-rests which are carried by the leg rests or supports 28, the foot-rests consisting each of a board of rectangular form the rear edge or margin of which is secured by two hinges 32 to the lower ends of the side-bars 29 of the leg-rest. Each of the foot-rests 31 extends forwardly and more or less upwardly, as desired, from the leg rest or support 28, and is retained in its required position by two rods or straps 33 which are pivotally connected at their lower ends, as at 34, to the outer rods of the sides of the foot-rests. The upper ends of the rods 33 are hooked so as to removably engage one or another of a number of pins or studs 35 which project outwardly from the side-bars 29, at the upper end-portions thereof. Thus it will be seen that the rods 33 support the foot-rests 31 either in horizontal position, or in suitably upwardly inclined position, as desired.

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In order to enable the occupant of the chair to readily move the lower ends of the foot-rests farther outward, as desired, a segmental rack-bar 36 is pivotally connected at its lower end, to the lower end of each one of the supporting-bars 27, the rack-teeth being formed on the outer side of the bars, and engaging a cross-bar 37 which extends horizontally between two pendent standards 8 above described. In order to admit of the pivotal connection of the ends of the rack-bars 36 to the lower ends of the supports 27, each of said rests is formed at its outer side with a longitudinal slot 38 in which works a pivot-pin 39 which is inserted transversely through the outer end of the corresponding rack bar and a socket 27a formed in the lower end of each support 27. The inner or rear end of each rack-bar 36 is formed with a hook-like extension 40 to which is secured one end of a rope or cord 41, or an equivalent flexible connection. There are two of the flexible connections 41, one for each rack-bar 36, and these flexible connections extend forwardly beneath a pulley 42 which is journaled in the lower ends of two brackets which are bolted or otherwise secured to the front part of the seat-frame 1, at the under side thereof. It is to be understood that there are two of these pulleys 42, one at each side of the middle of the front of the seat-frame, and it will be seen that when the occupant pulls upward upon either one of the flexible connections 41, the corresponding rack-bar 36 is disengaged from the bar 37, and the corresponding leg rest may be allowed to automatically swing downward and rearward, or may be moved pivotally outward and raised as desired. As soon as the pull upon the flexible connection is removed, the rack-bar 36 automatically re-engages the bar 37.

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