Brakes – Vehicle – Railway
Patent
1975-04-07
1976-08-03
Blix, Trygve M.
Brakes
Vehicle
Railway
188170, B61H 712
Patent
active
039723925
ABSTRACT:
A fail-safe clamping apparatus adapted to grip the sides of rails such as those used for cranes and railroads. The clamping apparatus includes a frame adapted for primary movement relative to and substantially parallel with the clamped member, and secondary movement substantially perpendicular to the sides of the clamped member. Secured to the frame, in opposed relation to the clamped member, are lateral guide brackets. A yoke assembly comprising a pair of lever pins and a pair of yoke members is slidably mounted in the lateral guide brackets for movement substantially perpendicular to the sides of the clamped member. Each one of a pair of clamp levers, having clamping surfaces in opposed relation to the sides of the clamped member, is pivotally mounted at one end on one of the lever pins. An actuating link is pivotally connected to the other end of each clamp lever. A fail-safe linear actuator is operatively secured to the frame such that its actuating axis is substantially perpendicular to an axis parallel with the clamped member and an axis perpendicular to the sides of the clamped member. The actuating links are pivotally connected to the linear actuator. The clamping surfaces and yoke assembly are moveable in the lateral guide brackets to compensate for the secondary movement of the frame. In their retracted position, the clamping surfaces are protected from contact with the clamped member by guide members secured to the yoke assembly.
REFERENCES:
patent: 1297083 (1919-03-01), Brown
patent: 1644942 (1927-10-01), Norris
patent: 1740726 (1929-12-01), Case
patent: 2856030 (1958-10-01), Snow, Jr.
Blix Trygve M.
Kazenske Edward R.
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