Threaded pin remover

Patent metadata

Field	Value
Publication number	US-2016176031-A1
Application number	US-201414576745-A
Country	US
Kind code	A1
Filing date	Dec 19, 2014
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A threaded pin remover for a threaded pin in an interference fit in a structure is provided. The threaded pin remover includes a housing. A pin grasper is slidably mounted in the housing and includes: a first end configured to couple to a linear actuator for slidably moving the pin grasper between an extended position relative to the housing and a retracted position relative to the housing. A second end of the pin grasper includes a pin grasping collet configured to, in the retracted position relative the housing, engage with a portion of the housing to cause grasping of the exposed portion of the threaded pin by the pin grasping collet to release the threaded pin from the interference fit, allowing removing of the threaded pin from the structure.

First claim

What is claimed is:

1 . A threaded pin remover for a threaded pin in an interference fit in a structure, the threaded pin remover comprising:
a housing including a collet engaging surface; and a pin grasper slidably mounted in the housing, the pin grasper including:
a first end configured to couple to a linear actuator for slidably moving the pin grasper between an extended position relative to the housing and a retracted position relative to the housing, and
a second end including a pin grasping collet configured to, in the retracted position relative the housing, engage with the collet engaging surface of the housing to cause grasping of the exposed portion of the threaded pin by the pin grasping collet to release the threaded pin from the interference fit, allowing removing of the threaded pin from the structure.

2 . The threaded pin remover of claim 1 , wherein the pin grasper further includes:
a connector configured to couple to the linear actuator at the first end; and an adapter coupling the connector to the pin grasping collet.

3 . The threaded pin remover of claim 2 , wherein the adapter is threadably coupled to the connector and threadably coupled to the pin grasping collet.

4 . The threaded pin remover of claim 1 , wherein the housing includes:
a body; and wherein the collet engaging surface includes a collet engaging sleeve extending from the body and configured to engage an external surface of the pin grasping collet in the retracted position and disengage from the pin grasping collet in the extended position.

5 . The threaded pin remover of claim 4 , wherein the collet engaging sleeve has a length configured to accommodate a seating distance of the threaded pin relative to a surface of the structure, and wherein, in operation, an end of the body engages the surface of the structure.

6 . The threaded pin remover of claim 4 , further comprising a linear actuator coupled to the first end of the pin grasper, and wherein the body includes a linear actuator seat configured to mount the body to a portion of the linear actuator.

7 . The threaded pin remover of claim 1 , further comprising a linear actuator coupled to the first end of the pin grasper.

8 . The threaded pin remover of claim 7 , wherein the linear actuator is selected from the group consisting of: a hydraulic ram and a pneumatic ram.

9 . The threaded pin remover of claim 1 , wherein the pin grasping collet includes:
a sleeve having a distal end including: an inner surface shaped to substantially match an external surface of the threaded pin, and a substantially frusto-conical outer surface; and at least three equally spaced kerf cuts extending radially through the distal end.

10 . The threaded pin remover of claim 9 , wherein each kerf cut extends radially through the sleeve from the distal end of the sleeve to a medial location of the sleeve.

11 . The threaded pin remover of claim 10 , wherein each kerf cut includes a rounded pressure relief element at the medial location of the sleeve.

12 . The threaded pin remover of claim 1 , wherein, as the pin grasper moves from the extended position to the retracted position, the piston grasper substantially simultaneously grasps the exposed portion of the threaded pin, releasing the interference fit and longitudinally moves the threaded pin relative to the structure.

13 . A threaded pin remover for a threaded pin in an interference fit in a structure, comprising:
a housing including a body, and a collet engaging sleeve extending from the body; a pin grasper slidably mounted in the housing, the pin grasper including:
a connector configured to couple to a linear actuator for slidably moving the pin grasper between an extended position relative to the housing and a retracted position relative to the housing,
a pin grasping collet configured to, in the retracted position relative the housing, engage with a portion of the housing to cause grasping of the exposed portion of the threaded pin by the pin grasping collet to release the threaded pin from the interference fit, allowing removing of the threaded pin from the structure, and
an adapter coupling the connector to the pin grasping collet.

14 . The threaded pin remover of claim 13 , wherein the adapter is threadably coupled to the connector and threadably coupled to the pin grasping collet.

15 . The threaded pin remover of claim 13 , further comprising a linear actuator coupled to the connector, and wherein the body includes a linear actuator seat configured to mount the body to the linear actuator.

16 . The threaded pin remover of claim 15 , wherein the linear actuator is selected from the group consisting of: a hydraulic ram and a pneumatic ram.

17 . The threaded pin remover of claim 13 , wherein the pin grasping collet includes:
a sleeve having a distal end including: an inner surface shaped to substantially match an external surface of the threaded pin, and a substantially frusto-conical outer surface; and at least three equally spaced kerf cuts extending radially through the distal end.

18 . The threaded pin remover of claim 17 , wherein each kerf cut extends radially through the sleeve from the distal end of the sleeve to a medial location of the sleeve.

19 . The threaded pin remover of claim 18 , wherein each kerf cut includes a rounded pressure relief element at the medial location of the sleeve.

20 . The threaded pin remover of claim 13 , wherein, as the pin grasper moves from the extended position to the retracted position, the pin grasping collet substantially simultaneously grasps the exposed portion of the threaded pin, releasing the interference fit and longitudinally moves the threaded pin relative to the structure.

Assignees

• Gen Electric

Inventors

• Buchan Charles Van
• Bush Melissa Jones

Classifications

• B23B2270/027

  Pneumatics · CPC title

• B23B2270/025

  Hydraulics · CPC title

• B23B31/2073

  Axially fixed cam, moving jaws (B23B31/20125 takes precedence) · CPC title

• B25B27/143 Primary

  for installing wire thread inserts or tubular threaded inserts · CPC title

• B25B27/026 Primary

  fluid driven · CPC title