Radial ball lock-up device

• US 5,447,092 A
• Filed: 02/28/1994
• Issued: 09/05/1995
• Est. Priority Date: 02/28/1994
• Status: Expired due to Fees

• Current Assignee: Crossfire LLC
• Original Assignee: Hesco, Inc.
• Inventors: Dobbins, David R.
• Primary Examiner(s): Jordan, Charles T.
• Application Number:
  US08/203,033
• Time in Patent Office: 554 Days
• Field of Search: 42/17, 42/14, 42/16, 89/187.02, 89/187.01, 89/173
• US Class Current: 89/187.02
• CPC Class Codes: F41A 3/46 mounted on the bolt F41A3/48 takes precedence
• CPC Class Codes: Y10T 403/604 Radially sliding catch
• CPC Class Codes: Y10T 403/606 Leaf spring

Abstract

A lock-up device for a firearm which utilizes a ball and cam arrangement to interlock two members. The interlocked members include ball engagement surfaces which are curved so that a substantial portion of the ball surface is in contact with the engagement surfaces. The lock-up device disposed in a firearm absorbs inertia forces and utilizes the absorbed inertia force to cycle the firearm.

Claims

1. A firearm having a lock-up mechanism comprising:

a barrel;

a receiver portion attached to said barrel at a rear end of said barrel;

a stock attached to said receiver portion at a rear portion of said receiver portion; and

a lock-up mechanism including;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve;

lock ball means for being disposed in a locking position between said inner lock sleeve and said outer lock sleeve, said lock ball means are releasable from said locking position by said cam member; and

biasing means for biasing said lock ball means from said locking position.

2. The firearm according to claim 1, wherein said biasing means is a leaf spring.

3. The firearm according to claim 1, wherein said lock ball means includes a plurality of lock balls with a predetermined radius;

and

said inner and outer lock sleeves each have a plurality of concave ball contact surfaces formed of a three dimensional section of an inner-spherical surface with a curvature substantially equal to said predetermined radius of said lock balls.

4. The firearm according to claim 1, further including a cam spring connected between said inner lock sleeve and said cam member wherein said cam spring stores inertia energy when a projectile is discharged by said firearm and utilizes said inertia energy to unlock and cycle said firearm.

5. The radial ball locking mechanism according to claim 1, wherein said inner and outer lock sleeves are made of a ceramic.

6. The firearm according to claim 1, further comprising sealing means for sealing said lock-up device within a sealed unit which is protected from debris.

7. The firearm according to claim 1, further including inertia storing means for cycling of the lock-up device by linear inertial guidance.

9. The firearm according to claim 6, wherein said lock ball means includes a plurality of lock balls with a predetermined radius;

and

said inner and outer lock sleeves each have a plurality of concave ball contact surfaces with a curvature substantially equal to said predetermined radius of said lock balls wherein said concave ball contact surfaces provide surface contact with said lock balls which is greater than point and line contact.

8. A breech bolt lock-up mechanism, for use in a firearm, comprising;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve;

lock ball means capable of being disposed in a locking position between said inner lock sleeve and said outer lock sleeve, said lock ball means being releasable from said locking position by said cam member; and

biasing means for biasing said lock ball means from said locking position.

10. The firearm lock-up mechanism of claim 8, wherein said lock ball means includes a plurality of lock balls with a predetermined radius;

and

further wherein said inner and outer lock sleeves each have a plurality of concave ball contact surfaces formed of a three dimensional section of an inner-spherical surface with a curvature substantially equal to said predetermined radius of said lock balls.

11. The firearm lock-up mechanism of claim 10, wherein said biasing means is a leaf spring.

12. The firearm according to claim 8, wherein said inner and outer lock sleeves are made of a ceramic.

13. The firearm according to claim 8, further comprising sealing means for sealing said lock-up mechanism within a sealed unit which is protected from debris.

14. A firearm having a lock-up mechanism comprising:

a barrel;

a receiver portion attached to said barrel at a rear end of said barrel;

a stock attached to said receiver portion at a rear portion of said receiver portion; and

a lock-up mechanism including;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve;

lock ball means for being disposed in a locking position between said inner lock sleeve and said outer lock sleeve;

said lock ball means are releasable from said locking position by said cam member;

wherein said lock ball means includes a plurality of lock balls with a predetermined radius; and

said inner and outer lock sleeves each have a plurality of concave ball contact surfaces formed of a three-dimensional section of an inner-spherical surface with a curvature substantially equal to said predetermined radius of said lock balls.

15. The firearm according to claim 14, further including biasing means for biasing said plurality of lock balls from said locking position.

16. The firearm according to claim 15, wherein said biasing means is a leaf spring.

17. The firearm according to claim 14, further including a cam spring connected between said inner lock sleeve and said cam member wherein said cam spring stores inertia energy when a projectile is discharged by said firearm and utilizes said inertia energy to unlock and cycle said firearm.

18. The firearm according to claim 14, wherein said inner and outer sleeves are made of a ceramic.

19. The firearm according to claim 14, further comprising sealing means for sealing said lock-up device within a sealed unit which is protected from debris.

20. A firearm having a lock-up mechanism comprising:

a barrel;

a receiver portion attached to said barrel at a rear end of said barrel;

a stock attached to said receiver portion at a rear portion of said receiver portion; and

a lock-up mechanism including;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve;

lock ball means for being disposed in a locking position between said inner lock sleeve and said outer lock sleeve;

said lock ball means are releasable from said locking position by said cam member; and

a cam spring connected between said inner lock sleeve and said cam member wherein said cam spring stores inertia energy when a projectile is discharged by said firearm and utilizes said inertia energy to unlock and cycle said firearm.

21. The firearm according to claim 20, wherein said inner and outer lock sleeves are made of a ceramic.

22. The firearm according to claim 20, further comprising sealing means for sealing said lock-up device within a sealed unit which is protected from debris.

23. A firearm having a lock-up mechanism comprising:

a barrel;

a receiver portion attached to said barrel at a rear end of said barrel;

a stock attached to said receiver portion at a rear portion of said receiver portion; and

a lock-up mechanism including;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve;

a lock ball means for being disposed in a locking position between said inner lock sleeve and said outer lock sleeve;

said lock ball means are releasable from said locking position by said cam member;

wherein said inner and outer lock sleeves are made of a ceramic.

24. The firearm according to claim 23, further comprising sealing means for sealing said lock-up device within a sealed unit which is protected from debris.

25. A breech bolt lock-up mechanism, for use in a firearm, comprising;

an inner lock sleeve;

an outer lock sleeve axially aligned with said inner lock sleeve;

a cam member axially aligned with said inner lock sleeve and said outer lock sleeve; and

lock ball means capable of being disposed in a locking position between said inner lock sleeve and said outer lock sleeve, said lock ball means being releasable from said locking position by said cam member, wherein said lock ball means includes a plurality of lock balls with a predetermined radius, and said inner and outer lock sleeves each have a plurality of concave ball contact surfaces formed of a three-dimensional section of an inner-spherical surface with a curvature substantially equal to said predetermined radius of said lock balls.