Collet type fastener removal tool

• US 5,095,779 A
• Filed: 12/01/1989
• Issued: 03/17/1992
• Est. Priority Date: 12/01/1989
• Status: Expired due to Term

• Current Assignee: Fairchild Holding Corp. (ON Semiconductor Corporation)
• Original Assignee: VXI Corporation (GN Store Nord A/S)
• Inventors: Batten, Ronald W.
• Primary Examiner(s): Smith, James G.
• Application Number:
  US07/444,407
• Time in Patent Office: 837 Days
• Field of Search: 81/124.1, 81/55, 81/453
• US Class Current: 81/55
• CPC Class Codes: B25B 13/44 of the chuck type
• CPC Class Codes: B25B 13/488 for connections where two parts must be turned in opposite directions by one tool

Abstract

There is disclosed a tool for the removal of locking collars of the frangible fasteners used in the aerospace industry, particularly for removal of fasteners installed in close quarters such in a deep channel where conventional tools cannot grip the collar. The tool has a collet-type chuck to grasp the collar of the fastener and has a lead screw to lock the collet chuck about the collar and permit removal of the collar. For this purpose, the collet chuck has a cylindrical neck which is received within a sleeve. The lead screw is received in the opposite end of the collet sleeve and is threadably engaged in the internally threaded bore of the collet chuck member, preferably with left hand threads, and has a head with wrenching flats. The lead screw has a central axial through bore which receives a key member which is used to immobilize the stud or bolt of the fastener system. A disk member is slidably received within the collet sleeve to eject removed collars from the collet chuck member.

Claims

1. A fastener collar removal tool comprising:

a. a cylindrical collet chuck member having an outwardly flared base with segmented jaws and an upper cylindrical neck having an internally threaded bore;

b. a collet sleeve having at least one external flat and a through bore having an enlarged diameter counterbore to provide an internal shoulder at one end, an outwardly flared opposite end and receiving the flared base and cylindrical neck of said collet chuck member;

c. a lead screw having a head with at least one wrenching flat and a threaded shank with an axial through bore slidably received in said axial through bore of said collet sleeve and threadably engaged in said internally threaded bore of said collet chuck member;

d. an elongated key having at least one continuous flat slidably received in said axial through bore of said lead screw; and

a. a first compression coil spring within said collet sleeve and captured between the received end of said collet chuck member and the internal shoulder of said collet sleeve to bias said collet chuck outwardly of said collet sleeve.

2. The improvement in a fastener collar removal tool according to claim 1 which also includes a spring retainer fixedly secured to the received end of said key and a second compression coil spring captured between said spring retainer and the received end of said lead screw to bias said spring retainer and key towards said collet jaws.

3. The tool of claim 1 wherein said internal threads on said collet chuck member and said external threads of the shank of said lead screw are left hand threads.

4. The tool of claim 1 including at least one wrenching flat on the upper external wall of said collet sleeve.

5. The tool of claim 1 wherein the head of said lead screw has an annular groove with a circular spring received in said annular groove.

6. The tool of claim 1 including a washer between the head of said lead screw and the upper end of said collet sleeve.

7. A collar fastener removal tool which comprises:

a. a cylindrical collet chuck member having an outwardly flared base with segmented jaws and an upper, externally threaded neck, and a through bore with a larger diameter counterbore to provide an internal annular shoulder therein;

b. a collet sleeve having at least one external flat and an internally threaded through bore with an outwardly flared lower end receiving the flared base and threaded cylindrical neck of said collet chuck member;

c. an elongated key having at least one continuous flat slidably received in said axial through bore of said collet chuck member; and

d. a spring retainer fixedly secured to the received end of said key and a compression coil spring captured between said spring retainer and said internal shoulder to bias said spring retainer and key towards said collet jaws, thereby serving to eject a collar from said jaws.

8. The collar fastener removal tool of claim 7 wherein said collet sleeve has a flatted shank to fit a socket wrench.

9. The collar fastener removal tool of claim 7 wherein said external threads on said collet chuck member and said internal threads of the collet sleeve are left hand threads.

10. The tool of claim 7 wherein the upper end of said collet chuck member extends beyond said collet sleeve and bears at least one wrenching flat.

11. The tool of claim 7 wherein the upper end of said collet sleeve has an annular groove with a circular spring received in said annular groove.