Pull clamps for straightening automobile underframes and door hinge pillars, and their use
Patent 5335533 Issued on August 9, 1994. Estimated Expiration Date: June 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A universal pull clamp includes multiple attachment points and slots. The clamp may be attached to any of a variety of types of damaged automobile frames and locations during their repair. Once the clamp is attached, straightening is accomplished by pulling on the clamp with an external force to return the frame back to its original shape. In one form, the clamp uses a sliding bar and channel arrangement. In another form, the clamp uses a pivoting arrangement.
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Catalog of Tools USA, pp. 11-18 (1991)
Catalog of Pull-It Corporation, "The Original MoClamp", entire catalog (1991)
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Catalog 87 of California Tool Co., pp. 638, 638-633, and 638-639 (date unknown)
Catalog of Mac Tools, pp. 385-386 (date unknown)
Catalog All of H. K. Porter, Inc., p. 15 (date unknown