F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
188/108, 188/111
F16D 55/16 (2006.01) A63C 17/14 (2006.01) B62B 5/04 (2006.01) F16D 49/00 (2006.01) F16D 65/14 (2006.01) F16D 65/30 (2006.01)
Patent
CA 1094466
ABSTRACT OF THE DISCLOSURE Wheeled, dual axle device having a platform which is supported by an axle arrangement which provides a mechanical action for engaging and disengaging a brake when force or weight is applied to the platform/or the platform is tilted from a predetermined position. At least one wheel is mounted on a wheel bearing axle and the load receiving platform is mounted on a load bearing axle. An upright connects the load and wheel bearing axles and is free to pivot relative to the axes of both axles. When weight is applied to the platform and the wheel is placed in contact with the resisting element, the upright rotates relative to the of the load and wheel bearing axles until it reaches an equilibrium position. Thereafter, the upright tends to remain in the equilibrium position notwithstanding rotation of the load receiving platform about the axis of the load bearing axle. Brake means are actuated in response to the rotation movement of the load receiving platform while the upright remains in the equilibrium position. If the upright is moved from the equilibrium position, force is generated by the upright as it attempts to restore itself under the influence of the weight to the equilibrium position. This force is used to operate the brake mechanism. In the preferred embodiment, an axially expanding brake mechanism is sensitive to the amount of weight on the platform and the degree of tilt of the 1. platform. Upon engagement of the brake, thee rotating wheel mounted brake pad cooperates with the axially expanding brake mechanism to cause the upright to tend to move or create a force that increases the braking force in one direction of rotation (self-energizing braking) and decreases the braking force in the opposite direction of rotation. The de-acceleration force produced by braking also tends to influence the upright to move or decrease a force so as to control the self-energizing braking action to prevent brake lock-up.
303182
Borden Ladner Gervais Llp
March Enterprise
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