Twisting and bending machine for elongated metallic strips

• US 4,026,137 A
• Filed: 04/19/1976
• Issued: 05/31/1977
• Est. Priority Date: 04/19/1976
• Status: Expired due to Term

• Current Assignee: Henry L. Scroggins
• Original Assignee: Henry L. Scroggins
• Inventors: Scroggins, Henry L.
• Primary Examiner(s): Keenan, Michael J.
• Application Number:
  US05/678,195
• Time in Patent Office: 407 Days
• Field of Search: 72/299, 72/310, 72/371, 72/64, 72/151, 140/149
• US Class Current: 72/299
• CPC Class Codes: B21D 11/14 Twisting

Abstract

A machine for twisting and bending of elongated metallic strips which takes the form of a base upon which is mounted an elongated member of polygonal cross-section. A first holder is fixed to one end of said elongated member with a second holder being slidably mounted upon said elongated member adjacent the free end thereof. Within the first holder is located a first grasping means. Within the second holder is located a second grasping means. An elongated metallic strip is to be fixedly secured at each end thereof to said first grasping means and said second grasping means and to be positioned in a taut manner therebetween. A biasing means is included within said second holder with said second grasping means moving against said biasing means. A torque applying means attached to said first grasping means. Upon rotational movement of said torque applying means a uniform twist is established along the length of the metallic strip. A twist eliminator structure may be connected to the machine which would prevent a twist being formed a selected distance spaced from each end of the metallic strip if such is desired.

Claims

1. A machine comprising:

a base, said base including an elongated member upon which is mounted a first holder and a second holder, said second holder being movable upon said elongated member toward and away from said first holder and fixable by fixing means in a particular selected position;

first grasping means connected to said first holder, said first grasping means being rotatable in respect to said first holder, said first grasping means adapted to securely connect with an elongated metallic strip;

torque applying means connected to said first grasping means, said torque applying means to effect rotation of said first grasping means;

said second holder including a second grasping means, said second grasping means includes a member secured against rotation in respect to said second holder but capable of a limited amount of longitudinal movement in respect thereto between a retracted position and an extended position, said member securable to the free end of said elongated metallic strip resulting in said elongated metallic strip being held in a taut manner between said first grasping means and said second grasping means; and

biasing means connected to said second grasping means, said biasing means tending to maintain said member in said retracted position, said biasing means comprises a coil spring assembly, one end of said coil spring assembly connected to the free end of said member with the other end of said spring assembly abutting said second holder, the direction of the force of the spring assembly coincides with the longitudinal center axis of said elongated metallic strip.

2. The machine as defined in claim 1 wherein:

said elongated member being polygonal in cross-section, said second holder having an aperture therein adapted to mate with the cross-section of said elongated member, whereby said second holder not being capable of rotation with respect to said elongated member.

3. The machine as defined in claim 1 wherein:

said biasing means comprises a single coil spring wound about said member.

4. The machine as defined in claim 1 wherein said first grasping means comprises:

a rod, a fastener cooperating with said rod, said rod being rotatably mounted within appropriate aperture means within said first holder, said fastening means cooperating with a slot adapted to receive an end of said metallic strip, by tightening of said fastening means said metallic strip is securely bound within said slot.

5. The machine as defined in claim 4 wherein:

said biasing means comprises a single coil spring wound about said member.

6. The machine as defined in claim 1 including:

twist eliminator means attached to said machine and adapted to be movable along the length of said metallic strip, whereby upon rotation of said torque applying means said twist eliminator means preventing twisting of said metallic strip along a certain length of said metallic strip.

7. The machine as defined in claim 6 wherein:

said twist eliminator means includes a first eliminator slidably movable upon said elongated member and located adjacent said second holder, said eliminator being connectable through a slot with said metallic strip.

8. The machine as defined in claim 6 wherein:

said twist eliminator means includes a second eliminator in the form of an attaching member attached to said first grasping means and extending longitudinally along side a portion of said metallic member, a member slidably mounted upon said attaching member, said member including a slot adapted to receive said metallic strip and to be slidable thereon.