Methods for removing blind fasteners

• US 7,555,820 B2
• Filed: 01/24/2005
• Issued: 07/07/2009
• Est. Priority Date: 01/24/2005
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Mally, Sujith N., McEldowney, Paul A.
• Primary Examiner(s): Hong; John C
• Application Number:
  US11/042,753
• Publication Number:
  US 20060165507A1
• Time in Patent Office: 1,625 Days
• Field of Search: 294/264, 294/265, 294/14, 295/66, 411/34
• US Class Current: 29/426.4
• CPC Class Codes: B21J 15/50 Removing or cutting devices for rivets
• CPC Class Codes: Y10T 29/49821 by altering or destroying work part or connector

Abstract

Various methods and apparatuses for removing blind fasteners, portions of blind fasteners, and/or other fasteners from structural assemblies are described herein. In one embodiment, a blind fastener can have a core bolt extending through a passage in a body. One method for removing the blind fastener from a structural assembly in accordance with one aspect of the invention can include removing a head portion from the core bolt, and driving the remaining portion of the core bolt at least partially through the body in a first direction. The method can further include extracting the body from the bore in a second direction opposite to the first direction. In one embodiment, the body can be extracted from the bore by inserting a tool into the passage and engaging the body, and then pulling the body in the second direction with the tool.

Claims

1. A method for removing a blind fastener from a bore, the blind fastener having a core bolt extending through a passage in a body, the method comprising:

removing a head portion from the core bolt;

driving a remaining portion of the core bolt partially through the passage in the body in a first direction; and

extracting the body from the bore in a second direction, opposite to the first direction, whereby the remaining portion of the core bolt remains at least temporarily supported by the body while the body is being extracted from the bore in the second direction.

2. The method of claim 1 wherein extracting the body from the bore includes inserting a tool into the passage and pulling the body in the second direction with the tool.

3. The method of claim 1 wherein the head portion of the core bolt is a first head portion, and wherein extracting the body from the bore includes inserting a tool through a second head portion of the body and pulling the body in the second direction with the tool.

4. The method of claim 1 wherein extracting the body from the bore includes engaging a threaded portion of a tool with an interior portion of the body and pulling the body in the second direction with the tool.

5. The method of claim 1 wherein extracting the body from the bore includes engaging an interior portion of the body with a screw extractor and pulling the body in the second direction with the screw extractor.

6. The method of claim 1 wherein extracting the body from the bore includes inserting a tool into the passage while the remaining portion of the core bolt is at least temporarily supported by the body, and pulling the body in the second direction with the tool.

7. The method of claim 1 wherein the head portion of the core bolt is a first head portion, and wherein removing the first head portion from the core bolt includes engaging a second head portion of the body to prevent the body from rotating about a longitudinal axis.

8. The method of claim 7 wherein engaging a second head portion of the body includes engaging a countersunk head portion.

9. The method of claim 7 wherein engaging a second head portion of the body includes engaging a countersunk head portion by inserting at least a first prong into a first recess in the countersunk head portion.

10. The method of claim 7 wherein engaging a second head portion of the body includes engaging a countersunk head portion by inserting at least a first prong on a cutting tool adapter into a first recess in the countersunk head portion, and wherein removing the first head portion from the core bolt further includes cutting the first head portion with a rotating cutter positioned within the cutting tool adapter.

11. A method of detaching a first aircraft part from a second aircraft part, the method comprising:

identifying at least one fastener attaching the first aircraft part to the second aircraft part;

when the fastener is a blind fastener having a core bolt extending through a passage in a body;

removing a head portion from the core bolt;

driving a remaining portion of the core bolt partially through the passage in the body in a first direction; and

extracting the body from the first and second aircraft parts in a second direction, opposite to the first direction, whereby the remaining portion of the core bolt remains at least temporarily supported by the body while the body is being extracted from the first and second aircraft parts.

12. The method of claim 11 wherein the first and second aircraft parts define an accessible front side and an inaccessible backside of an aircraft structural assembly, and wherein removing a head portion from the core bolt includes cuffing the head portion from the front side of the structural assembly.

13. The method of claim 11 wherein the first and second aircraft parts define an accessible front side and an inaccessible backside of an aircraft structural assembly, wherein removing a head portion from the core bolt includes cutting the head portion from the front side of the structural assembly, and wherein extracting the body from the first and second aircraft parts includes separating the body from the remaining portion of the core bolt and causing the remaining portion to fall free of the first and second aircraft parts on the backside of the aircraft structural assembly.

14. The method of claim 11 wherein extracting the body from the first and second aircraft parts includes inserting a tool into the passage while the remaining portion of the core bolt is at least temporarily supported by the body, and pulling the body in the second direction with the tool.

15. A system for removing a blind fastener from a bore, the blind fastener having a core bolt extending through a passage in a body, the method comprising:

means for removing a head portion from the core bolt;

means for driving a remaining portion of the core bolt partially through the passage in the body in a first direction; and

means for extracting the body from the bore in a second direction, opposite to the first direction, whereby the remaining portion of the core bolt remains at least temporarily supported by the body while the body is being extracted from the bore in the second direction.

16. The system of claim 15 wherein the means for extracting the body from the bore include means for engaging the body and pulling the body in the second direction.

17. The system of claim 15 wherein the head portion of the core bolt is a first head portion, and wherein the means for extracting the body from the bore include means for engaging the body and pulling the body in the second direction while leaving a second head portion of the body intact.

18. The system of claim 15 wherein the means for driving a remaining portion of the core bolt include means for driving the remaining portion partially through the passage in the body without separating the remaining portion from the body.