Firearm having anti-play buffers
View Patent ↗A rifle having a receiver formed of upper and lower receiver portions attached to one another has one or more elastic bodies positioned between facing surfaces of the upper and lower receiver portions. The elastic bodies reduce play or lost motion between the upper and lower receiver portions for improved accuracy.
1. A receiver for a firearm, said receiver having a lengthwise extending centerline, said receiver comprising:
a lower receiver portion having a first interface surface extending along opposite sides of said centerline;
an upper receiver portion having a second interface surface extending along opposite sides of said centerline;
a hinge positioned between and pivotally attaching said lower and upper receiver portions to one another for positioning said first and second interface surfaces in facing relation with one another;
a first elastic body positioned offset from said centerline between said first and second interface surfaces, said first elastic body being engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another.
2. The receiver according to claim 1 , further comprising a second elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another.
3. The receiver according to claim 2 , wherein said second elastic body is positioned offset from said centerline and on an opposite side thereof from said first elastic body.
4. The receiver according to claim 1 , wherein said first elastic body is mounted on said lower receiver portion to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
5. The receiver according to claim 4 , further comprising a second elastic body mounted on said lower receiver portion offset from said centerline to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
6. The receiver according to claim 5 , wherein said first and second elastic bodies comprise pins mounted within respective first and second holes positioned in said first interface surface on opposite sides of said centerline.
7. The receiver according to claim 6 , wherein at least one of said pins comprises a bulbous head and a conical body attached to said bulbous head.
8. The receiver according to claim 5 , wherein said first and second elastic bodies comprise elongate strips.
9. The receiver according to claim 5 , wherein:
said first and second elastic bodies are positioned distally to said hinge.
10. The receiver according to claim 5 , wherein:
said first and second elastic bodies are positioned proximate to said hinge.
11. The receiver according to claim 9 , further comprising:
a third elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another;
a fourth elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another; and wherein
said third and fourth elastic bodies are positioned proximate to said hinge.
12. The receiver according to claim 11 , wherein said third and fourth elastic bodies are mounted on said lower receiver portion offset from and on opposite sides of said centerline to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
13. The receiver according to claim 11 , wherein said third and fourth elastic bodies each have a compressive stiffness greater than a compressive stiffness of said first and second elastic bodies.
14. The receiver according to claim 1 , wherein said first elastic body is mounted on said upper receiver portion to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
15. The receiver according to claim 14 , further comprising a second elastic body mounted on said upper receiver portion offset from said centerline to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
16. The receiver according to claim 15 , wherein said first and second elastic bodies comprise pins mounted within respective first and second holes positioned in said second interface surface on opposite sides of said centerline.
17. The receiver according to claim 15 , wherein at least one of said pins comprises a bulbous head and a conical body attached to said bulbous head.
18. The receiver according to claim 15 , wherein said first and second elastic bodies comprise elongate strips.
19. The receiver according to claim 15 , wherein:
said first and second elastic bodies are positioned distally to said hinge.
20. The receiver according to claim 15 , wherein:
said first and second elastic bodies are positioned proximate to said hinge.
21. The receiver according to claim 19 , further comprising:
a third elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another;
a fourth elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another; and wherein
said third and fourth elastic bodies are positioned proximate to said hinge.
22. The receiver according to claim 21 , wherein said third and fourth elastic bodies are mounted on said upper receiver portion offset from and on opposite sides of said centerline to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
23. The receiver according to claim 21 , wherein said third and fourth elastic bodies each have a compressive stiffness greater than a compressive stiffness of said first and second elastic bodies.
24. A firearm comprising:
a receiver having a lower receiver portion and an upper receiver portion, said receiver having a lengthwise extending centerline;
said lower receiver portion having a first interface surface extending along opposite sides of said centerline;
said upper receiver portion having a second interface surface extending along opposite sides of said centerline;
a hinge positioned between and pivotally attaching said lower and upper receiver portions to one another for positioning said first and second interface surfaces in facing relation with one another;
a first elastic body positioned offset from said centerline between said first and second interface surfaces, said first elastic body being engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another.
25. The firearm according to claim 24 , further comprising a second elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another.
26. The firearm according to claim 25 , wherein said second elastic body is positioned offset from said centerline and on an opposite side thereof from said first elastic body.
27. The firearm according to claim 24 , wherein said first elastic body is mounted on said lower receiver portion to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
28. The firearm according to claim 27 , further comprising a second elastic body mounted on said lower receiver portion offset from said centerline to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
29. The firearm according to claim 28 , wherein said first and second elastic bodies comprise pins mounted within respective first and second holes positioned in said first interface surface on opposite sides of said centerline.
30. The firearm according to claim 29 , wherein at least one of said pins comprises a bulbous head and a conical body attached to said bulbous head.
31. The firearm according to claim 28 , wherein said first and second elastic bodies comprise elongate strips.
32. The firearm according to claim 28 , wherein:
said first and second elastic bodies are positioned distally to said hinge.
33. The firearm according to claim 28 , wherein:
said first and second elastic bodies are positioned proximate to said hinge.
34. The firearm according to claim 32 , further comprising:
a third elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another;
a fourth elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another; and wherein
said third and fourth elastic bodies are positioned proximate to said hinge.
35. The firearm according to claim 34 , wherein said third and fourth elastic bodies are mounted on said lower receiver portion offset from and on opposite sides of said centerline to project from said first interface surface and engage said second interface surface when said interface surfaces are in facing relation with one another.
36. The firearm according to claim 34 , wherein said third and fourth elastic bodies each have a compressive stiffness greater than a compressive stiffness of said first and second elastic bodies.
37. The firearm according to claim 24 , wherein said first elastic body is mounted on said upper receiver portion to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
38. The firearm according to claim 37 , further comprising a second elastic body mounted on said upper receiver portion offset from said centerline to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
39. The firearm according to claim 38 , wherein said first and second elastic bodies comprise pins mounted within respective first and second holes positioned in said second interface surface on opposite sides of said centerline.
40. The firearm according to claim 39 , wherein at least one of said pins comprises a bulbous head and a conical body attached to said bulbous head.
41. The firearm according to claim 38 , wherein said first and second elastic bodies comprise elongate strips.
42. The firearm according to claim 38 , wherein:
said first and second elastic bodies are positioned distally to said hinge.
43. The firearm according to claim 38 , wherein:
said first and second elastic bodies are positioned proximate to said hinge.
44. The firearm according to claim 42 , further comprising:
a third elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another;
a fourth elastic body positioned between said first and second interface surfaces and engaged with said upper and lower receiver portions when said interface surfaces are in facing relation with one another; and wherein
said third and fourth elastic bodies are positioned proximate to said hinge.
45. The firearm according to claim 44 , wherein said third and fourth elastic bodies are mounted on said upper receiver portion offset from and on opposite sides of said centerline to project from said second interface surface and engage said first interface surface when said interface surfaces are in facing relation with one another.
46. The firearm according to claim 44 , wherein said third and fourth elastic bodies each have a compressive stiffness greater than a compressive stiffness of said first and second elastic bodies.