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Thread repair insert

a thread repair and insert technology, applied in the direction of threaded fasteners, screws, bolts, etc., can solve the problems of the head shear off at the break-off groove, and achieve the effects of durable thread, simple and inexpensive manufacturing, and strong practicability

Inactive Publication Date: 2001-09-20
LOCK N STITCH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028] Another further object of the present invention is to provide a thread repair insert as characterized above which strengthens and seals a cracked threaded hole such that a threaded fastener may be received within said threaded hole via the thread repair insert.
[0030] Another further object of the present invention is to provide a thread repair insert wherein the exterior threads are slightly spaced from each other and maintain a minimum thickness between a root and a crest thereof, providing a durable thread.
[0031] Another further object of the present invention is to provide a thread repair insert as characterized above which is simple and inexpensive to manufacture and yet durable in construction.
[0032] Another further object of the present invention is to provide a thread repair insert as characterized above for cold crack repair which quickly mends cracks which have propagated within a threaded hole in a material and for receiving a threaded fastener therein.

Problems solved by technology

However, the application of torque continues until a maximum torsional force for the break-off groove of the neck is reached causing the head to shear off at the break-off groove.

Method used

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Embodiment Construction

[0051] Considering the drawings, wherein like reference numerals denote like parts throughout the various drawing figures, reference numeral 10 is directed to the thread repair insert according to the present invention.

[0052] In essence, and referring to FIGS. 1 through 4, the thread repair insert 10 includes a drive head 20 at an uppermost portion thereof, a neck 30 below the drive head 20, a shoulder 40 below the neck 30 and a sleeve 60 extending below the shoulder 40. The sleeve 60 includes an exterior threaded portion 62 which extends from an upper portion 64 to a bottom portion 66. The exterior threaded portion 62 includes a plurality of threads 68 thereon which include an upper surface 72 and a lower surface 74 which extend upward toward the head 20 from a minor diameter 69 to a major diameter 70. Thus, a crest 76 of each thread 68 is closer to the head 20 than a portion of the thread 68 between adjacent roots 82 at the minor diameter 69.

[0053] The thread repair insert 10 furt...

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Abstract

An insert for thread repair having an interior thread and a specially formed exterior thread which both precludes upheaval between sides of the cracked material on opposite sides of the crack and draws the crack together, radially inward towards the center of the insert. The insert may include a driving head, either solid or having a central hollow and may include a frangible neck to dissociate the head from the insert.

Description

[0001] The present invention relates generally to thread repair inserts and, in particular, to a thread repair insert and method for repairing threaded holes disposed in materials and for repairing threaded holes disposed in materials in which a crack has propagated therethrough such that the repaired threaded hole may receive a threaded fastener via the insert.[0002] Materials often exhibit a variety of different failure mechanisms. On occasion, materials are loaded beyond a tensile strength of the material and the material fractures abruptly and completely. In these circumstances the material is usually non-repairable and must be replaced. However, often materials do not fail in an abrupt complete manner, but rather fail due to fatigue or localized stresses which exceed design criteria, causing cracks to form in the material. Often when these cracks initially form, the material is still functional for its desired purpose. For instance, a reciprocating machine may receive cracks in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B23P6/04F16B37/12
CPCB23P6/04F16B37/122Y10T29/49734Y10T29/49744
Inventor REED, GARY JACK
Owner LOCK N STITCH INC
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