Clamp

• US 3,986,746 A
• Filed: 09/23/1975
• Issued: 10/19/1976
• Est. Priority Date: 09/23/1975
• Status: Expired due to Term

• Current Assignee: Guy-Chart Tools Limited
• Original Assignee: Guy-Chart Tools Limited
• Inventors: Chartier, Guy Norman
• Primary Examiner(s): Cherry, Johnny D.
• Application Number:
  US05/616,085
• Time in Patent Office: 392 Days
• Field of Search: 294/85, 294/86 R, 294/94, 294/95, 294/104, 294/106, 294/114, 294/116, 24/132 WL, 24/134 M, 24/134 E, 24/134 EA, 24/134 CP, 24/135 N, 24/136 R, 24/136 A, 24/136 B, 24/248 C, 24/248 E, 24/248 SA , 24/248 SB, 29/253, 29/262, 104/258, 238/328, 238/353, 238/358, 238/359, 248/226 C, 248/228, 248/316 R, 254/24
• US Class Current: 294/116
• CPC Class Codes: B21D 25/04 Clamping arrangements
• CPC Class Codes: B66C 1/48 to vertical edge portions of sheets, tubes, or like thin or thin-walled articles internally-expanding grippers B66C1/54
• CPC Class Codes: Y10S 72/705 Vehicle body or frame straightener
• CPC Class Codes: Y10T 24/44684 with operator for moving biased engaging face
• CPC Class Codes: Y10T 24/44932 having specific surface material or irregularity on or along engaging face
• CPC Class Codes: Y10T 24/44974 Threaded cylindrical rod and mating cavity

Abstract

A clamping attachment for tensile pulling devices has a pair of clamping members designed to be arranged side by side, the members each being designed to provide one of a pair of facing jaws. The clamping members and the jaws are arranged to allow the jaws to grasp a member between them. The jaws are each provided with bores designed to be aligned when they are grasping a member between them and a bolt is provided designed to extend through the aligned bores, the bolt having a head on one end and a nut on the other. Each of the bores at their outwardly facing ends is enlarged to provide a surface defining a cavity at the corresponding entrance to the bores. Bearing members are provided adjacent each and of the bolt designed to contact the respective surfaces of the cavities and to bear thereon as the nut is tightened. The surfaces are shaped to allow the bearing members to move thereover as the bolt moves over a predetermined angular range relative to the clamping member and the bores are made sufficiently larger than the bolt to allow movement over such predetermined angular range. A member is provided for allowing tensile pull on the clamp on the side of the bolt remote from said jaws, the means being designed, upon the exertion of the tensile pull, to tend to spread the jaws at the end thereof remote from said clamping surfaces, whereby the jaws tend to pivot about the bearing members.

Claims

1. Clamping attachment for tensile pulling device comprising:

a pair of clamping members designed to be arranged side by side, said members being each designed to provide one of a pair of facing jaws;

said members and said jaws being arranged to allow said jaws to grasp a member between them;

said jaws being each provided with bores designed to be aligned when said jaws are grasping a member between them;

a bolt member being designed to extend through said aligned bores,

each of said bores, at their outwardly facing ends, being enlarged to provide a surface defining a cavity at the corresponding entrance to the bores,

bearing members adjacent each end of said bolt designed to contact the respective surfaces of said cavities and to bear thereon;

said enlarged bore surfaces being shaped to allow said bearing members to move thereover as said bolt moves over a predetermined angular range relative to said clamping members,

said bores being made sufficiently larger than said bolt to allow such predetermined limited angular movement;

means for allowing tensile pull on said clamping attachment on the side of said bolt remote from said jaws,

said means allowing tensile pull comprising a conical member designed to have its wider end received between said clamping members at the end thereof remote from said jaws, and to have its narrow end project outwardly from between said clamping members at said remote end, means attached to said narrow end to allow connection of said conical member to a tensile pulling member, said clamping members at the end remote from said jaws being shaped to define a cavity to receive the large end of said conical members and to define means on which said conical member bears;

whereby the application of tensile pull on said connection allowing means said conical member acts to spread the jaw remote ends of said clamping members.

2. A device as claimed in claim 1 including means designed to bias said clamping members outwardly along said bolt.