Pivot mount for firearm sighting devices and accessories

• US 20130036650A1
• Filed: 08/11/2011
• Published: 02/14/2013
• Est. Priority Date: 08/11/2011
• Status: Active Grant

• Current Assignee: Mark C. Larue
• Original Assignee: Mark C. Larue
• Inventors: Larue, Mark C.
• Granted Patent: US 8,510,983 B2
• Time in Patent Office: Days
• US Class Current: 42/148
• CPC Class Codes: F41G 11/003 Mountings with a dove tail element, e.g. "Picatinny rail systems"

Abstract

A pivot mount base is assembled to or removed from the sight mounting rail of a firearm by a lever actuated cam energized rail clamping mechanism. A pivot shaft is fixed within an axially oriented pivot passage of the mount base and defines spaced external bearing surfaces. A pivotal accessory support device defines spaced pivot receptacles having a portion of said pivot mount base located therebetween and has bearing receptacles receiving the pivot shaft. The accessory support device is moveable both linearly and rotatably relative to the fixed pivot shaft and is urged toward a locked position with a locking pin by a compression spring and is moved against the spring force to free the accessory support device for manual rotational movement to a precision aiming position and to a laterally offset position.

Claims

1. A pivot mount mechanism for a firearm sighting device, comprising:

a mount base adapted to be secured in substantially fixed relation on a firearm and defining a pivot shaft receptacle and having a first lock member;

a pivot shaft being disposed in fixed relation with said mount base;

a sight support member having pivotal movement about said pivot shaft and being pivotally moveable to a sighting position and to a laterally offset non-sighting position; and

a second lock member being disposed in fixed relation with said sight support member and being moveable into locking engagement with said first lock member and releasably securing said sight support member at said sighting position.

2. The pivot mount mechanism of claim 1, comprising:

said sight support member being disposed in both linearly and pivotally moveable relation with said pivot shaft.

3. The pivot mount mechanism of claim 1, comprising:

a pivot projection extending from said mount base;

said first lock member being a lock receptacle defined by said pivot projection; and

said second lock member being a locking pin fixed to said sight support member and being disposed for locking engagement with said lock receptacle.

4. The pivot mount mechanism of claim 3, comprising:

said pivot projection defining a pivot receptacle through which said pivot shaft extends

said pivot projection defining a spring receptacle about said pivot shaft; and

a spring member being located within said spring receptacle and applying spring force to said pivot projection and to said sight support member and urging said sight support member toward a position establishing releasable locking engagement of said first and second lock members.

5. The pivot mount mechanism of claim 4, comprising:

said pivot projection defining an internally threaded section within said pivot receptacle; and

said pivot shaft having an externally threaded section having threaded engagement with said internally threaded section of said pivot projection and securing said pivot shaft in said fixed relation with said pivot projection of said mount base.

6. The pivot mount mechanism of claim 1, comprising:

a spring member applying spring force to said mount base and to said sight support member and urging said sight support member toward a position establishing releasable locking engagement of said second lock member with said first lock member; and

said releasable locking engagement of said second lock member with said first lock member being released by application of force overcoming said spring force and moving said sight support member in an unlocking direction disengaging said releasable locking engagement of said first and second lock members and permitting rotation of said sight support member about said pivot shaft.

7. The pivot mount mechanism of claim 1, comprising:

said firearm sighting device having a mount base being mounted to a firearm having a barrel defining a bore;

a pivot projection being defined by said mount base and having said pivot shaft receptacle defined therein and having precision orientation in parallel relation with the bore of the firearm barrel, said pivot projection further defining a lock receptacle;

said sight support member defining spaced pivot projections having said pivot projection located therebetween, each of said spaced pivot projections defining a pivot pin receptacle having linearly and rotatable moveable relation with said pivot pin and; and

a lock pin being disposed in fixed relation within said sight support member and having a locking position in locking engagement within said lock receptacle and an unlocking position retracted from locking engagement within said lock receptacle.

8. The pivot mount mechanism of claim 1, comprising:

a sight mounting rail being present on the firearm; and

a locking lever actuated clamp mechanism being defined by said mount base and responsive to selective locking lever movement establishing a clamping condition securing said mount base to the sight mounting rail and a release condition permitting separation of said mount base from the sight mounting rail.

9. The pivot mount mechanism of claim 1, comprising:

said mount base having a predetermined axial dimension; and

said sight support member having spaced pivot projections having spacing greater than said predetermined dimension and being linearly and rotationally moveable about said pivot shaft and relative to said mount base.

10. The pivot mount mechanism of claim 1, comprising:

said second lock member being a locking pin of circular cross-sectional configuration; and

said first lock member being a locking receptacle of generally U-shaped cross-section receiving said locking pin and establishing precision positioning of said sight support member at said sighting position.

11. A pivot mount mechanism for support and positioning of a sighting device of a firearm, comprising:

a mount base adapted to be secured in substantially fixed relation on a firearm and having opposed axial end surfaces establishing a defined axial dimension, said mount base further defining a pivot passage and defining a locking receptacle;

a pivot shaft being fixed within said pivot passage of said mount base and defining spaced external bearing surfaces;

a pivotal accessory support device defining spaced internal bearing surfaces having linear and pivotal engagement with said spaced external bearing surfaces and permitting linear and pivotal movement of said pivotal accessory support device relative to said pivot shaft and said mount base;

a lock member being disposed in fixed relation with said pivotal accessory support device and being positioned for locking engagement with said locking receptacle at a precision aiming position of said pivotal accessory support device; and

a spring member applying spring force to said mount base and to said pivotal accessory support device urging said pivotal accessory support device to a position engaging said lock member with said locking receptacle at said precision aiming position.

12. The pivot mount mechanism of claim 11, comprising:

said mount base defining a pivot projection having said pivot passage therein, said pivot projection having opposed surfaces establishing said defined axial dimension; and

said pivotal accessory support device having spaced pivot projections defining a pivot receptacle having greater axial spacing than said defined axial dimension and each having a bearing opening receiving said pivot shaft and establishing linear and rotational movement of said pivot accessory support device about said pivot shaft and within said pivot receptacle.

13. The pivot mount mechanism of claim 11, comprising:

said pivotal accessory support device defining a pivot receptacle and defining an internally threaded section within said pivot receptacle; and

said pivot shaft having an externally threaded section having threaded engagement with said internally threaded section of said pivot receptacle and securing said pivot shaft in said fixed relation with said mount base.

14. The pivot mount mechanism of claim 11, comprising:

said mount base defining a pivot projection having said a pivot receptacle defined therein;

said pivot shaft having end portions defining substantially cylindrical bearing surfaces; and

said pivotal accessory support device having spaced pivot projections each defining a pivot passage receiving one of said substantially cylindrical bearing surfaces of said pivot shaft in rotatable and linearly moveable relation therein

15. The pivot mount mechanism of claim 11, wherein a sight mounting rail is present on the firearm, said pivot mount mechanism comprising:

a locking lever actuated clamp mechanism being present on said mount base and being responsive to selective locking lever movement establishing a clamping condition securing said mount base to the sight mounting rail and establishing a release condition permitting separation of said mount base from the sight mounting rail.

16. A pivot mount mechanism for support and positioning of a sighting device of a firearm, comprising:

a mount base adapted to be secured in substantially fixed relation on a firearm and having opposed axial end surfaces establishing a defined axial dimension;

a pivot projection extending from said mount base and defining a pivot passage extending therethrough and having an axial end portion defining a pair of angularly offset locking receptacles;

a pivot shaft being fixed within said pivot passage of said pivot projection and defining spaced external bearing surfaces;

a pivotal accessory support device defining spaced internal bearing surfaces having linear and pivotal engagement with said spaced external bearing surfaces and permitting linear and pivotal movement of said pivotal accessory support device relative to said pivot shaft and said mount base;

a lock member being disposed in fixed relation with said pivotal accessory support device and being positioned for locking engagement with a first of said locking receptacles at a precision aiming position of said pivotal accessory support device being positioned for locking engagement with a second of said locking receptacles at a laterally offset position of said pivotal accessory support device; and

a spring member applying spring force to said mount base and to said pivotal accessory support device and urging said pivotal accessory support device toward a position engaging said lock member with a locking receptacle at said precision aiming position and at said laterally offset position.

17. The pivot mount mechanism of claim 16, comprising:

a lock recess being defined by said pivotal accessory support device;

said lock member being a locking pin of circular cross-sectional configuration being fixed within said lock recess; and

said lock receptacles each being of generally U-shaped cross-section being disposed to receive said locking pin in releasable locking relation therein and establishing precision positioning of said pivotal accessory support device at said sighting position.

18. The pivot mount mechanism of claim 16, comprising:

an internally threaded section being defined within said pivot passage of said pivot projection; and

an externally threaded section being defined by said pivot shaft and having threaded engagement with said internally threaded section and securing said pivot shaft in fixed relation with said pivot projection and said mount base.

19. The pivot mount mechanism of claim 16, comprising:

a spring receptacle being defined within said pivot passage of said pivot projection; and

a spring member being located within said spring receptacle and applying spring force to said mount base and to said pivotal accessory support device and urging said pivotal accessory support device toward a position engaging said lock member with said locking receptacle at said precision aiming position and at said laterally offset position.

20. The pivot mount mechanism of claim 16, comprising:

said pivotal accessory support device being forcibly moveable linearly against said spring force to unseat said lock member from a lock receptacle and free said pivotal accessory support device for pivotal rotation to said aiming position or said laterally offset position;

said mount base defining a pivot projection having said pivot passage therein, said pivot projection having opposed surfaces establishing said defined axial dimension; and

said pivotal accessory support device having spaced pivot projections defining a pivot receptacle having greater axial spacing than said defined axial dimension and each having a bearing opening receiving said pivot shaft and establishing linear and rotational movement of said pivot accessory support device about said pivot shaft and within said pivot receptacle.