Patent ID: 7708119
Filing Date: 2010-05-04
Classification: B62B

Abstract:
1. A brake device for a pushcart, the pushcart having a cart frame and a wheel, said brake device comprising: a hollow main seat adapted to be disposed fixedly on the cart frame and in proximity to the first wheel; a main movable member disposed movably within said main seat and movable between upper and lower limit positions; a main biasing member for biasing said main movable member to said upper limit position; a main positioning unit for holding said main movable member at said upper and lower limit positions; and a main brake mechanism adapted to be disposed between said main seat and the wheel and including a main pin-engaging member that is adapted to be connected fixedly to the wheel and that is formed with a plurality of grooves, and a main brake pin connected to said main seat and said main movable member so as to engage one of said grooves in said main pin-engaging member when said main movable member is disposed at said lower limit position, and so as to disengage from the one of said grooves in said main pin-engaging member when said main movable member is disposed at said upper limit position; wherein said main brake mechanism includes a main resilient member that is disposed within said main seat, said main movable member being formed with a cam portion, said main brake pin being biased by said main resilient member and being driven by said cam portion of said main movable member so as to move toward and away from said grooves; wherein said main movable member has an externally accessible operating portion that projects from said main seat and that is operable to move said movable member between said upper and lower limit positions; and wherein said main positioning unit includes: