Abstract: A wheelchair for the handicapped is provided having an arm-rest hinge block including a back half-block fastened to an upright back of a structure and carrying a pivot pin. An arm-rest half-block mounted to pivot on the pivot pin includes a bore that rotatably receives a cylindrical shank of an angled arm-rest so that the shank is locked in position when the angled arm-rest occupies a substantially horizontal plane or a substantially vertical plane.

Abstract: An extendible chair arm comprises a rail member supported by an arm stump, a sliding member disposed in rail member being moveable within a length of trough of rail member, a first pivot plate with inner end pivotably secured to sliding member by a bearing, and a second pivot plate pivotably secured to the outer end of first pivot plate. With this, arm pad supported by second pivot plate can move and pivot with respect to the chair as sliding member moves in cooperation with the rotation of first pivot plate relative to sliding member and second pivot plate for providing a support for elbow when doing office work on table. Thus prevents arm fatigue.

Abstract: An armrest assembly includes a tube secured to a chair seat and an adjusting seat mounted in the tube. The adjusting seat includes an adjusting section having a first vertical slide passage. A peripheral side defining the first vertical slide passage includes a number of vertically spaced positioning notches. The adjusting section further includes a second vertical slide passage, the first vertical side passage and the second vertical slide passage together defining a loop passage. An armrest is mounted above the adjusting seat. An actuating member includes an upper end secured to the armrest to move therewith. The actuating member further includes a lower end slidably received in the adjusting seat. A positioning member is attached to the actuating member and includes an end slidable along the loop passage so as to be selectively and releasably engaged in one of the positioning notches for supporting the armrest at a desired level.

Abstract: A clutching mechanism for pivotably mounting a first member relative to a second member includes an axis of rotation, a first member, a second member, a shaft, a coil spring clutching member, a cam plate, and a clutch engagement member. The axis of rotation passes through the first member. The second member is pivotably mounted relative to the first member for relative rotation therebetween about the axis of rotation. The shaft is fixed to the first member and is centered on the axis of rotation. The coil spring clutching member has a helically wound body wrapped around the shaft. A first end of the spring clutching member extends radially outwardly from the body to engage the second member. A second end of the spring clutching member extends radially outwardly from the body as well. The cam plate is fixed relative to the shaft and is disposed adjacent the second member. The clutch engagement member is slideably disposed relative to the second member and receives the second end of the spring clutching member.

Abstract: An ergonomic arm support for supporting the forearm during typing, keying, or assembly operations. The arm support includes an armrest pivotally mounted on a shroud for sliding the armrest to and away from a cantilever disk which is secured to a table or chair. The shroud is pivotally slidable or repositionable relative to the cantilever disk such that the armrest, which is pivotal relative to the shroud may be positioned to provide a wide range of locations for positioning of an individual's forearms. The cantilever disk permits easy or convenient inward, outward, forward, or backward positioning of an armrest relative to an object where the cantilever disk frictionally engages the shroud to lock the armrest into a desired position during use. The shroud may also function as an enclosure of the cantilever disk to prevent inadvertent engagement between an individual and/or the individual's clothes and the cantilever disk.

Abstract: An armrest construction for chairs includes an armrest support having a lower end constructed for attachment to a chair, an upper end, and a mounting block attached to the upper end. A pivot block is pivoted to the mounting block at a main pivot, the pivot block having an upwardly-extending follower. First and second gears are each pivoted to the pivot block, the gears having intermeshing teeth at an inner end such that rotation of the first gear causes the second gear to simultaneously rotate in an opposite direction, the first and second gears further having outer ends. A support plate having pivot/slide members engages the outer ends of the first and second gears, and further has a guide operably engaging the follower to guide lateral movement of the support plate along a predetermined path.