초록 ▼

A wheel chair (A) has at least one wheel (50) rotatably mounted to a side frame (14). A combined wheel lock and hill holder assembly (D) is mounted adjacent an outermost peripheral surface of a tire (60) mounted to a rim (58) of the wheel. The wheel lock and hill holder assembly has a linkage includ

A wheel chair (A) has at least one wheel (50) rotatably mounted to a side frame (14). A combined wheel lock and hill holder assembly (D) is mounted adjacent an outermost peripheral surface of a tire (60) mounted to a rim (58) of the wheel. The wheel lock and hill holder assembly has a linkage including a handle member (74) and a brake lever (80) both pivotally connected to the base. A link (84) is pivotally connected in between. Shifting the handle member causes the brake lever to move an axle (90) toward and away from the peripheral surface of the tire. A cam surface (94) having a plurality of projections (102) is rotatably mounted on the axle. In a first mode (FIG. 3), the wheel is free rolling. In a second mode (FIG. 4), the cam surface is moved by the handle into firm friction engagement with the tire peripheral surface to lock the wheel against any rotation. In a third mode (FIG. 5), the cam surface is spring biased into engagement with the wheel such that rotation in one direction is permitted but rotation in the opposite direction causes increasing engagement between the cam and the tire peripheral surface locking the wheel against rotation in that direction.

대표청구항 ▼

A wheel chair comprising: a frame assembly; a seat means for supporting an operator, the seat means being supported by the frame assembly; a plurality of wheels connected with the frame assembly for rollably supporting the frame assembly; a combined wheel lock and hill holder assembly mounted to the

A wheel chair comprising: a frame assembly; a seat means for supporting an operator, the seat means being supported by the frame assembly; a plurality of wheels connected with the frame assembly for rollably supporting the frame assembly; a combined wheel lock and hill holder assembly mounted to the frame assembly adjacent a periphery of a first of the wheels which has: a first mode in which the first wheel is free wheeling, a second mode in which the wheel lock and brack assembly engages the first wheel periphery and prevents rotation of the first wheel in both first and second directions, and a third mode in which the wheel lock and brake assembly engages the first wheel periphery and limits rotation of the first wheel to the first direction such that the first wheel rotates in the first direction and is locked against rotation in the second direction, wherein the combined wheel lock and hill holder assembly includes: a cam member with a surface having progressively increasing radii therealong from a minor radius adjacent one end through an intermediate radius portion to a major radius portion in the second mode, and engages the first wheel periphery adjacent the intermediate radius portion in the third mode.