Breech block for pneumatic shooting device

• US 5,908,024 A
• Filed: 11/21/1997
• Issued: 06/01/1999
• Est. Priority Date: 11/21/1997
• Status: Expired due to Fees

• Current Assignee: Bulforce Engineering Limited
• Original Assignee: Bulforce Engineering Limited
• Inventors: Staev, Victor S.
• Primary Examiner(s): Eldred, J. Woodrow
• Application Number:
  US08/976,331
• Time in Patent Office: 557 Days
• Field of Search: 124/71, 124/72, 124/73, 124/74, 124/75, 124/31, 124/37, 124/41.1, 124/51.1, 124/52, 124/76
• US Class Current: 124/71
• CPC Class Codes: F41B 11/52 the projectiles being loosely held in a magazine above the gun housing, e.g. in a hopper

Abstract

The breech block for pneumatic shooting device is utilized in weapons for expelling solid-state bodies or marking pellets. It has a simplified and easy for maintenance construction ensuring long term exploitation and minimum fluid consumption for one shot. The breech block comprises a housing 1 in which a barrel 2 is mounted. A step-shaped cylindrical bore is formed in the housing 1, and a piston 4 having two parts 9 and 10 of different diameters is placed in the bore. The step-shaped bore in the housing 1 has a portion 13 which diameter is greater than the diameter of the rear part 10 of the piston 4. The piston 4 is provided with an axial passage 14, the rear end of which being connected to radial openings 8 formed at the rear part 10 of the piston 4.

Claims

1. A breech block for a pneumatic device for shooting away spherical pellets comprising:

a housing (1) connected with a barrel (2) having an inner diameter, said housing having a cylindrical bore provided with a base for receiving a piston (4), said piston including a front part having a diameter equal to the inner diameter of the barrel;

a spring (5) having a front end and a rear end provided in said cylindrical bore, the rear end of the spring including means urging the piston towards the base of said bore in said housing;

said bore being a step-shaped bore and including a first portion (11), a second portion (12) and a third portion (13), said first portion (11) having a diameter equal to the outer diameter of said barrel (2), said second portion (12) having a diameter equal to the diameter of a rear part (10) of the piston (4) and said third portion (13) having a diameter greater than the diameter of the rear part (10) of the piston (4);

said spring (5) being positioned in the second portion (12) of the bore for urging a face of the rear part (10) of the piston (4); and

said piston (4) having in a rear part thereof a plurality of radial openings (8) and being provided with an axial passage (14) having a rear end connected to said plurality of radial openings (8) formed in the rear part (10) of the piston (4).

2. The breech block as claimed in claim 1, including a magazine for said spherical pellets connected with said barrel.

3. The breech block as claimed in claim 1, wherein said piston has a first part (9) and a second part forming said rear part (10), the diameters of said first and said second parts being different from each other.

4. The breech block as claimed in claim 1, wherein said spring (5) includes means at a front end thereof for urging the bottom of said housing (1).

5. The breech block as claimed in claim 1, including a plug (6) and a passage (7), said plug being connected by means of said passage to a valve and reservoir.

6. The breech block as claimed in claim 2, wherein said piston has a first part (9) and a second part forming said rear part (10), the diameters of said first and said second parts being different from each other.

7. The breech block as claimed in claim 2, wherein said spring (5) includes means at a front end thereof for urging the bottom of said housing (1).

8. The breech block as claimed in claim 3, wherein said spring (5) includes means at a front end thereof for urging the bottom of said housing (1).