Overload protection device for a lever
First Claim
1. An overload protection device for a manual hoist lever comprising:
- a pressure hub with a radially extending flange and a substantially centrally positioned cantilevered boss, said boss having a threaded outer surface with an axial groove extending from an end of said boss toward said radially extending flange;
an outer hub with a central opening, said outer hub including a tapered inner surface, and a flange contact surface which frictionally contacts said radially extending flange of said pressure hub;
a brake nut disposed in said central opening of said outer hub between said outer hub and said boss of said pressure hub, said brake nut having a frusto-conical outer surface that frictionally contacts said tapered inner surface of said outer hub, and a threaded inner opening with a corresponding axial groove, said threaded inner opening being sized to threadingly engage said threaded outer surface of said boss; and
a dowel pin received within a receiving hole formed upon alignment of said axial groove of said boss and said corresponding axial groove of said brake nut, thereby locking said pressure hub and said brake nut together to prevent relative rotation thereof.
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Accused Products
Abstract
An overload protection device for a manual hoist lever including a pressure hub, an outer hub, a brake nut, and a dowel pin. The pressure hub includes a radially extending flange and a cantilevered boss having a threaded outer surface with an axial groove. The outer hub includes a central opening, a tapered inner surface, and a flange contact surface which frictionally contacts the radially extending flange of the pressure hub. The brake nut is disposed in the central opening of the outer hub between the outer hub and the boss of the pressure hub, and includes a frusto-conical outer surface that frictionally contacts the tapered inner surface of the outer hub, as well as a threaded inner opening with a corresponding axial groove, the threaded inner opening being sized to threadingly engage the boss. The dowel pin is received within a receiving hole formed upon alignment of the axial groove of the boss and the corresponding axial groove of the brake nut. The outer hub preferably includes a plurality of ratchet gear teeth and the frictional resistance of the overload protection device adjustable by tightening or loosening the brake nut.
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Citations
23 Claims
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1. An overload protection device for a manual hoist lever comprising:
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a pressure hub with a radially extending flange and a substantially centrally positioned cantilevered boss, said boss having a threaded outer surface with an axial groove extending from an end of said boss toward said radially extending flange;
an outer hub with a central opening, said outer hub including a tapered inner surface, and a flange contact surface which frictionally contacts said radially extending flange of said pressure hub;
a brake nut disposed in said central opening of said outer hub between said outer hub and said boss of said pressure hub, said brake nut having a frusto-conical outer surface that frictionally contacts said tapered inner surface of said outer hub, and a threaded inner opening with a corresponding axial groove, said threaded inner opening being sized to threadingly engage said threaded outer surface of said boss; and
a dowel pin received within a receiving hole formed upon alignment of said axial groove of said boss and said corresponding axial groove of said brake nut, thereby locking said pressure hub and said brake nut together to prevent relative rotation thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification