A - Human Necessities – 47 – B
Patent
A - Human Necessities
47
B
A47B 53/00 (2006.01) A47B 53/02 (2006.01)
Patent
CA 2333810
A mobile storage unit includes a drive system which is operable in response to rotation of an actuator handle mounted to the mobile storage unit. A torque limiting mechanism is interposed between the actuator handle and the drive system, for rotating an input member of the drive system in response to rotation of the actuator handle. The torque limiting mechanism is operable to de-couple the actuator handle from the drive system input member when an excessive force is applied to the actuator handle, to prevent adverse effects which can result from application of an excessive force to the components of the drive system. The torque limiting mechanism includes a hub mounted to the actuator handle and an input member mounted to an input shaft associated with the mobile storage unit drive system. One or more engagement members are interposed between the hub and the input member, and are biased toward an engaged position in which the engagement members couple the hub and the input member together so as to transfer rotary force from the actuator handle to the input shaft. When a force exceeding a predetermined threshold is applied to the actuator handle, the engagement members move to a disengaged position to de-couple the hub member from the input member, and to thereby prevent transfer of such force to the input shaft. The engagement members are preferably in the form of spherical members which are received within passages formed in the hub member and are seated in passages or recesses formed in the input member. A spring bears between each engagement member and a set screw engaged with the hub member, and the biasing force exerted by the spring can be adjusted by movement of the set screw so as to adjust the threshold force required to move the engagement members to the disengaged position.
Borden Ladner Gervais Llp
Spacesaver Corporation
LandOfFree
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