McCraw, Clarence L.;

Cam assisted load binder

An over center load binder assembly is disclosed comprising a crank member, a clevis type draw bar with leg elements pivotally connected to a first portion of the crank member, a pull link pivotally connected to a second portion of the crank member and a lever handle, pivotally connected to the crank member and comprising a cam surface, radial to the axis of the lever handle pivotal connection, having a maximum lobe swell sufficient to displace the pull link from an alignment between the leg portions of the clevis type draw bar to release the assembly from tension.

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I claim:

1. An over center load binder assembly comprising a crank member, a clevis type draw bar with leg elements pivotally connected to a first portion of said crank member, a pull link pivotally connected to a second portion of said crank member and dimensioned to at least in part fit between leg portions of said clevis type draw bar, and a lever handle pivotally connected to said crank member for movement about an axis between said first and second portions, said level handle includes a cam surface, facing radially outwardly of said axis and having a maximum lobe swell sufficient to contact a surface of said pull link and displace said pull link from an alignment between said leg portions of said clevis type draw bar to release said load binder.

2. The load binder assembly of claim 1 wherein said lever handle is pivotally connected to said crank member on an axis displaced from a centerline between pivotal connections of said crank first and second portions.

3. The load binder assembly of claim 1 wherein said maximum lobe swell is sufficient to contact an upper surface of said pull link and displace said pull link from alignment between said leg portions of said clevis type draw bar to release said load binder.

4. The load binder assembly of claim 1 wherein said maximum lobe swell contacts an upper surface of said pull link and displaces said pull link from alignment between said leg portions of said clevis type draw bar sufficient to release said load binder when the lever handle is angled greater than about 60 degrees from the tension plane.

5. The assembly of claim 4 wherein said lever is angled greater than about 80 degrees from the tension plane.

6. The assembly of claim 1 wherein said crank member comprises a pair of parallel, spaced apart, panel elements, structurally connected by bridge elements.

7. The assembly of claim 6 wherein a bridge element comprises a leverage point for the lever handle in tensioning.

8. The assembly of claim 6 comprising a bridge element which engages said cam surface as the assembly is positioned in an over center locked position.

9. The assembly of claim 6 wherein said cam surface contacts an upper surface of said pull link when the assembly is in an over center locked position.

10. The assembly of claim 1 wherein said pull link is configured at a first end to receive a pivot pin.

11. The assembly of claim 10 wherein said pull link is configured at its other end with a ball and socket from which extends an eyelet or hook.

12. The assembly of claim 1 wherein said leg elements of said draw bar are configured to receive pivot pins.

13. The assembly of claim 12 wherein said draw bar is configured at one end with a ball and socket from which extends an eyelet or hook.

14. The assembly of claim 1 wherein an area of maximum lobe swell of said cam surface is positioned at an end of the lever handle least distant from the point of pivotal connection.

15. An over center load binder assembly, comprising a crank member, a clevis type draw bar with leg elements pivotally connected to a first portion of the crank member, a pull link pivotally connected to a second portion of the crank member, and a lever handle, pivotally connected to the crank member and comprising a cam surface radial to the axis of the lever handle pivotal connection, said surface having a maximum lobe swell sufficient to contact an upper surface of said pull link and displace and pull link from an alignment between the leg portions of the clevis type draw bar to release the assembly from tension.

16. An over center load binder assembly comprising a crank member, a draw bar pivotally connected to said crank member, a pull link pivotally connected to said crank member and a lever handle pivotally connected to said crank member for movement in opposite directions for moving said assembly over center between load locking and release conditions, said lever handle having a cam surface arranged to engage said pull link during movement of said lever handle in a first of said directions for moving said assembly from said load locking position over center towards said release position.

17. The assembly of claim 16 wherein said lower handle engages said crank member during movement in a second of said directions for moving said assembly from said release condition over center toward said locking position.

18. The assembly of claim 17, wherein said crank member includes first and second elements, the limit of pivotal movement in said first of said direction is defined by simultaneous engagement of said lever handle with said draw bar and said first element, said level handle engages with said second element during movement in said second of said directions for moving said assembly from said release condition over center towards said load locking position, and the limit of pivotal movement in said second of said directions is defined by simultaneous engagement of said second element with said pull link and said lever handle.

19. The assembly of claim 18, wherein said crank member comprises a pair of parallel panel elements connected by said first and second elements, said pull link and said lever handle including said cam surface are disposed sidewise between said panel elements and said draw bar is a clevis having a leg portion and said crank member is disposed sidewise between and pivotally connected to said leg portions.