Method for stretcher leveling metal with a gripping element

• US 5,740,690 A
• Filed: 02/13/1996
• Issued: 04/21/1998
• Est. Priority Date: 04/15/1983
• Status: Expired due to Fees

• Current Assignee: Bertram A. Holloway
• Original Assignee: Bertram A. Holloway
• Inventors: Holloway, Bertram A.
• Primary Examiner(s): Crane, Daniel C.
• Application Number:
  US08/600,829
• Time in Patent Office: 798 Days
• Field of Search: 76/101.1, 72/302, 264/265, 264/274, 264/259, 264/135, 427/388.1, 427/409, 428/423.1, 428/425.8
• US Class Current: 72/302
• CPC Class Codes: B21D 25/04 Clamping arrangements
• CPC Class Codes: B25B 1/241 characterised by surface features or material
• CPC Class Codes: B25B 1/2452 with supplementary jaws
• CPC Class Codes: B25B 5/163 Jaws or jaw attachments

Abstract

The present invention is an element for gripping metal to be stretched by a stretcher leveler apparatus. The gripping element includes a first and preferably a second high density cast polyurethane gripping pad adapted for engagement with the metal to be stretched and a support member which can be a rectangular plate upon which the first and second gripping pads are operatively anchored. The support member having two pads is detachably mounted to the stretcher leveler apparatus either in a first orientation in which the first pad is positioned for engagement with the metal to be stretched or a second orientation in which the second pad is positioned for engagement with the metal to be stretched. Preferably, the support member is a plate having a first support surface upon which the first gripping pad is chemically bonded and a second support surface upon which the second gripping pad is chemically bonded. The support surfaces are disposed on opposite sides of the plate and in a parallel relationship. The gripping pads are preferably cast in situ on the support member. Preferably, at least one threaded hole is disposed at either end of the support member for allowing attachment to the stretcher leveler apparatus with threaded fasteners.

Claims

1. A method for stretcher leveling metal with a gripping element comprising the steps of:

providing a rectangular support plate having a first support surface;

pouring polyurethane material onto the first support surface;

allowing the polyurethane material to solidify on the first support surface such that it chemically bonds thereto, thereby forming a first polyurethane gripping pad on the support plate so that the polyurethane gripping pad acts to grip the metal being stretcher leveled within the stretcher leveler apparatus;

inserting the polyurethane gripping rod into a stretcher leveler apparatus;

activating the stretcher leveler apparatus so the metal being stretched is gripped by the polyurethane gripping rod; and

stretcher leveling the metal so the metal is flattened and elongated.

2. A method as described in claim 1 wherein including before the pouring step, the step of applying adhesive to said support surface.

3. A method as described in claim 2 wherein the pouring step occurs essentially in a vacuum.