Bending tool

• US 4,356,718 A
• Filed: 10/16/1980
• Issued: 11/02/1982
• Est. Priority Date: 10/25/1979
• Status: Expired due to Term

• Current Assignee: Osamu Makino
• Original Assignee: Osamu Makino
• Inventors: Makino, Osamu
• Primary Examiner(s): Crosby, Gene
• Application Number:
  US06/197,733
• Time in Patent Office: 747 Days
• Field of Search: 72/389, 72/386, 72/383, 72/380, 72/385, 72/379, 72/413, 72/412, 72/473, 72/474
• US Class Current: 72/389.4
• CPC Class Codes: B21D 11/18 Joggling
• CPC Class Codes: B21D 5/0209 Tools therefor
• CPC Class Codes: B21D 5/0227 Length adjustment of the die

Abstract

A tool for bending a sheet material into a L-like or Z-like section. A pair of bending members each having a bending edge and a rectangular cavity formed in juxtaposition are disposed movably toward and away from each other so that the bending edge of one of the bending members is movable into the cavity of the other bending member and vice versa. The cavity is of such a cross section that a major surface of the sheet material being bent is left free from the inner wall of the cavity.

Claims

1. A bending tool for bending a sheet material into a section, comprising a first bending member having a first bending projection formed with a bending edge of a substantially right angle and a first groove having a predetermined depth and an adjustable width and disposed in juxtaposition with said first bending projection, and a second bending member having a second bending projection formed with a bending edge of a substantially right angle and a second groove having a predetermined depth and an adjustable width and disposed in juxtaposition with said second bending projection, wherein said first and second bending members are disposed to be movable in opposition to each other in such a manner that a perpendicular bisector extending through the apex of the bending edge of said first bending projection passes substantially a center of said second groove, while a perpendicular bisector extending through the apex of the bending edge of said second bending projection passes substantially a center of said first groove.

2. A bending tool as set forth in claim 1, wherein a block is disposed in each of said first and second grooves at a side remote from said bending edge, whereby the width of each of said grooves is adjustable by varying position of said block.

3. A bending tool as set forth in claim 2, wherein said block is mounted on each of said first and second bending members by means of lead screws so that the position of said block can be adjusted by rotating said lead screws.

4. A bending tool as set forth in claim 2, wherein said block is mounted on each of said first and second bending members with spacers being interposed therebetween, whereby the position of said block can be varied by means of said spacers.

5. A bending tool as set forth in claim 2, wherein said groove and said block are of a substantially rectangular cross-section, and a corner of said block located adjacent to said bending edge is chamfered with an angle of about 45°

.

6. A bending tool as set forth in claim 1, wherein the depth of said groove is so selected that said bending edge of one member reaches short of the bottom of said groove of the other member when said first and second bending members are meshed with each other.