Error free rivet system

• US 5,675,887 A
• Filed: 07/21/1995
• Issued: 10/14/1997
• Est. Priority Date: 07/21/1995
• Status: Expired due to Fees

• Current Assignee: Davidson Textron Inc. (Textron Inc)
• Original Assignee: Davidson Textron Inc. (Textron Inc)
• Inventors: Allen, Michael J., Scala, Gerald T., Gajewski, Gerard H.
• Primary Examiner(s): Bryant, David P.
• Application Number:
  US08/505,400
• Time in Patent Office: 816 Days
• Field of Search: 29/407.04, 29/407.05, 29/407.09, 29/524.1, 29/525.06, 29/702, 29/707, 29/714, 29/715-720, 29/721, 29/243.521, 29/243.53 , 29/281.1, 29/281.5, 29/812.5
• US Class Current: 29/702
• CPC Class Codes: B21J 15/10 Riveting machines electric heating elements H05B
• CPC Class Codes: B21J 15/28 Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups
• CPC Class Codes: B21J 15/42 Special clamping devices for workpieces to be riveted together, e.g. operating through the rivet holes
• CPC Class Codes: Y10T 29/49771 Quantitative measuring or gauging
• CPC Class Codes: Y10T 29/49956 Riveting
• CPC Class Codes: Y10T 29/53009 with comparator
• CPC Class Codes: Y10T 29/53065 with means to fasten by deformation
• CPC Class Codes: Y10T 29/53087 with signal, scale, illuminator, or optical viewer
• CPC Class Codes: Y10T 29/5377 Riveter

Abstract

A rivet system (10) locks separate parts (12, 14) of an assembly (13) together on a support fixture (20) with the clamping devices (28); which prevents release of the parts (12, 14) from the fixture (20) until a required number of rivets (51) have been counted. A rivet setting tool (50) provides insertion of the rivets (51) between the parts (12, 14), and which disposes spent rivet mandrels (62) through a vacuum tube (58) to be sensed and counted. A controller (100) automatically locks the parts in the support fixture and counts the sensed mandrels (62) to allow release of the assembly (13) only upon a predetermined count of mandrels (62).

Claims

1. A riveting system for ensuring the riveting together of at least two parts with a predetermined number of rivets at a workstation prior to removal of the resulting assembly from the workstation, said system comprising:

a support fixture located at the workstation for receiving the at least two parts;

a locking device operatively connected to said support fixture to hold and lock the at least two parts together on said support fixture;

a rivet setting tool operable to apply rivets to said at least two parts to connect the parts to one another forming an assembly; and

a system control apparatus connected to said locking device and said rivet setting tool to prevent release of said locking device and the parts until determining a predetermined number of rivets have been applied.

2. A system as set forth in claim 1 wherein said locking device includes a plurality of automatic clamps for locking each of the two members, said automatic clamps connected to and controlled by said system control apparatus.

3. A system as set forth in claim 1 wherein said rivet setting tool includes a vacuum tube for receiving spent rivet mandrels after application of each rivet.

4. A system as set forth in claim 3 further including a rivet sensor connected to said vacuum tube for detecting the presence of a spent rivet mandrel in said vacuum tube and for producing a count signal upon detection of each of said spent rivet mandrel.

5. A system as set forth in claim 3 wherein said system control apparatus includes a controller for receiving said count signal and providing a completed indication when said predetermined number of rivets have been detected.

6. A system as set forth in claim 5 wherein said controller includes clamp means for releasing said locking device upon detecting said predetermined number of spent mandrels.

7. A system as set forth in claim 1 wherein said support fixture comprises a first support portion for supporting the first part and a second support portion for supporting the second part in predetermined positions.

8. A system as set forth in claim 1 further including an actuator assembly for activating and deactivating the locking device for rotating said support fixture between a rotated and returned position to allow riveting of the parts in the rotated position with the locking device locking the two parts to the support fixture.

9. A system as set forth in claim 8 wherein said actuator assembly comprises first and second part actuators for controlling clamping and unclamping of said locking device in response to a control signal separately for each part.

10. A system as set forth in claim 9 wherein said actuator assembly includes a rotating actuator for controlling rotation of said support fixture with respect to the workstation in response to a control signal and for controlling return of said support fixture to a return position.

11. A system as set forth in claim 10 wherein said actuator assembly is pneumatically controlled.

12. A system as set forth in claim 1 wherein a system control apparatus includes a pair of first part sensors for determining the proper placement and presence of the first part and for producing a signal upon detection thereof.

13. A system as set forth in claim 12 wherein said system control apparatus includes second part sensor for detecting the presence and proper placement of the second part and for producing a signal indicative thereof.

14. A system as set forth in claim 13 wherein said system control apparatus includes a rotate sensor for indicating complete rotation of said support fixture and a return sensor indicating return of said support fixture to said return position and for producing control signals indicative of the detections thereof.

15. A system as set forth in claim 14 wherein said system control apparatus includes a status panel for indicating statuses of said system control apparatus.

16. A system as set forth in claim 15 wherein said control apparatus includes a controller for receiving the control signals from said sensors and for controlling the support fixture and status panel and locking device.

17. A system as set forth in claim 16 wherein said controller includes first position means for receiving said sensor signals from said pair of first part sensors and for visually indicating proper positioning of said first part.

18. A system as set forth in claim 17 wherein said controller includes second position means connected to said second part sensor for visually indicating the proper positioning of said second part.

19. A system as set forth in claim 18 further including rotating means connected to said rotate sensor and said return sensor for visually indicating full rotation and full return of said support fixture.

20. A system as set forth in claim 19 further including counting means connected to said rivet sensor for counting the number of spent rivet mandrels.

21. A system as set forth in claim 20 further including comparing means for storing a predetermined count number and for comparing said predetermined count number to said counting number to determine when said rivet sensor has detected said predetermined count number and for visually indicating same.