Tamper-evident bolt

• US 5,449,260 A
• Filed: 06/10/1994
• Issued: 09/12/1995
• Est. Priority Date: 06/10/1994
• Status: Expired due to Fees

• Current Assignee: Weldon M. Whittle
• Original Assignee: Weldon M. Whittle
• Inventors: Whittle, Weldon M.
• Primary Examiner(s): Wilson, Neill R.
• Application Number:
  US08/258,260
• Time in Patent Office: 459 Days
• Field of Search: 411/402, 411/403, 411/404, 411/410, 411/377, 411/373, 411/910, 411/911, 411/919
• US Class Current: 411/377
• CPC Class Codes: F16B 23/0007 characterised by the shape of the recess or the protrusion engaging the tool F16B23/0069 and F16B23/0076 take precedence
• CPC Class Codes: F16B 23/0061 with grooves, notches or splines on the external peripheral surface designed for tools engaging in radial direction F16B23/003 takes precedence
• CPC Class Codes: F16B 23/0092 with a head engageable by two or more different tools F16B23/0076 takes precedence
• CPC Class Codes: F16B 37/14 Cap nuts; Nut caps or bolt caps
• CPC Class Codes: F16B 41/005 Measures against unauthorised operation of bolts, nuts or pins F16B23/0007, F16B23/0061, F16B23/0069, F16B23/0076 and F16B31/02 take precedence; locks, keys E05B; for valves, taps or cocks F16K35/00; for pipe-joints with swivel-nuts F16L19/005
• CPC Class Codes: Y10S 411/911 One-way drive
• CPC Class Codes: Y10S 411/919 Screw having driving contacts

Abstract

The invention herein disclosed involves a "tamper-evident bolt". More specifically, the bolt has ratchet or splined teeth on the outer periphery of the bolt head which will accept a socket for tightening the bolt. In the center of the head of the bolt is a sealed or capped blind axial recess. The recess is fitted to accept a driver to release the bolt. In a specific embodiment the blind axial recess has ratchet teeth. A seal or cap is received within the blind axial recess such that the seal or cap must be removed for access to the bolt releasing means, thereby indicating the possibility of unauthorized tampering with the bolt.

Claims

1. A tamper-evident bolt comprising a bolt head having an outer periphery and further having a blind axial recess formed therein, first ratchet teeth are formed on the outer periphery of the head, whereby a driving socket having ratchet teeth corresponding to the first ratchet teeth may be placed over the outer periphery of the bolt head to seat the bolt, second ratchet teeth are formed within the periphery of the blind axial recess of the bolt head, whereby a driver having teeth corresponding to the second ratchet teeth may be received within the blind axial recess to loosen and remove the bolt, and a seal received within and covering the blind axial recess, such that the seal must be removed for access to the blind axial recess, thereby indicating tampering with the bolt.

2. The tamper-evident bolt of claim 1, wherein the seal is disposed substantially flush with the bolt head.

3. The tamper-evident bolt of claim 1, wherein the seal has been pressed into the blind axial recess.

4. The tamper-evident bolt of claim 1, wherein the bolt is a threaded bolt.

5. The tamper-evident bolt of claim 4, wherein the threads of the bolt opposite the bolt head are shaped to be received within a tapped hole.

6. The tamper-evident bolt of claim 4, wherein the threads of the bolt opposite the bolt head are self-tapping threads.

7. The tamper-evident bolt of claim 1, wherein the bolt has an unthreaded shank.

8. The tamper-evident bolt of claim 1, wherein the blind axial recess has a pilot stud in its center.

9. The tamper-evident bolt of claim 1, wherein the ratchet teeth run parallel to the longitudinal axis of the bolt.

10. The tamper-evident bolt of claim 1, wherein the ratchet teeth are at an angle relative to the longitudinal axis of the bolt.

11. A tamper-evident bolt comprising the bolt head having an outer periphery and further having a blind axial recess formed therein, ratchet teeth are formed on the outer periphery of the head, whereby a driving socket having ratchet teeth corresponding to the ratchet teeth may be placed over the outer periphery of the bolt head to seat the bolt, a blind axial recess in the bolt head being shaped to receive a driver having a shape corresponding to the shape of the blind axial recess such that the driver received within the blind axial recess may loosen and remove the bolt, and a seal received within the blind axial recess, such that the seal must be removed for access to the blind axial recess, thereby indicating tampering with the bolt.

12. The tamper-evident bolt of claim 11, wherein the seal is disposed substantially flush with the bolt head.

13. The tamper-evident bolt of claim 11, wherein the seal has been pressed into the blind recess axial recess.

14. The tamper-evident bolt of claim 11, wherein the blind axial recess is shaped with ratchet teeth to receive a driver with corresponding ratchet teeth.

15. The tamper-evident bolt of claim 11, wherein the blind axial recess is hexagonal.

16. The tamper-evident bolt of claim 11, wherein the blind axial recess is square shaped.

17. The tamper-evident bolt of claim 11, wherein the bolt is provided with threads adapted to be received in a tapped hole.

18. The tamper-evident bolt of claim 11, wherein the bolt is provided with self-tapping threads.

19. The tamper-evident bolt of claim 11, wherein the bolt has an unthreaded shank.

20. The tamper-evident bolt of claim 11, wherein the blind axial recess has a pilot stud in its center.

21. The tamper-evident bolt of claim 11, wherein the ratchet teeth run parallel to the longitudinal axis of the bolt.

22. The tamper-evident bolt of claim 11, wherein the ratchet teeth are at an angle relative to the longitudinal axis of the bolt.

23. A tamper-evident bolt comprising the bolt head having an outer periphery and further having a blind axial recess formed therein, splined teeth are formed on the outer periphery of the head, whereby a driving socket having splined teeth corresponding to the ratchet teeth may be placed over the outer periphery of the bolt head to seat the bolt, a blind axial recess in the bolt head being shaped to receive a driver having a shape corresponding to the shape of the blind axial recess such that the driver received within the blind axial recess may loosen and remove the bolt, and a seal received within the blind axial recess, such that the seal must be removed for access to the blind axial recess, thereby indicating tampering with the bolt.

24. The tamper-evident bolt of claim 23, wherein the splined teeth on the outer periphery are at an angle relative to the longitudinal axis of the bolt.

25. The tamper-evident bolt of claim 23, wherein the splined teeth on the outer periphery are parallel relative to the longitudinal axis of the bolt.