Safety interlock system
AssigneeAndvantage Lift Systems, Inc.
InventorsRobert H. Fletcher, James Myers
Life of this patent
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Abstract
A safety interlock system is provided for enabling ascend or descend interrupt of an automotive lift platform. A interface of negative rake sinusoidal shaped surfaces is employed together with an assembly for selectably placing such surfaces against each other during descent interrupt.
Claims8
A safety system for use with an expansible hydraulic power element comprising a piston and cylinder, the piston pivotally connected to a support leg, of a vehicle lift system and such cylinder, pivotally connected to a lifting platform, the safety system comprising:
- (a) lower locking means secured to a housing of said piston, said lower locking means having a continuous negative rake sinusoidal locking surface (NRSLS);
- and
- (b) upper locking means securable within the path of travel of said NRSLS of said lower locking means, said upper locking means having a continuous negative rake sinusoidal surface proportioned for selectable interlock with said NRSLS surface of said lower locking means.
A safety system for effecting an emergency interlock of normally non-interlocking mechanical elements operating in slidable relationship to each other, comprising:
- (a) first locking means, secured to a first of said mechanical elements, having a continuous negative rake sinusoidal locking surface (NRSLS);
- and
- (b) second locking means, secured to a second of said mechanical elements, having a continuous NRSLS proportioned for selectable interlock with said NRSLS of said first locking means responsive to an emergency-caused change in the normally non-interlocking relationship of said moveable elements.
Dependencies are inferred from the claim text.