Cartridge for a power driven tool

• US 5,493,975 A
• Filed: 02/21/1995
• Issued: 02/27/1996
• Est. Priority Date: 02/21/1995
• Status: Expired due to Fees

• Current Assignee: Burndy Corporation
• Original Assignee: Burndy Corporation
• Inventors: Franzini, John A., Pecora, Gennaro L.
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US08/391,918
• Time in Patent Office: 371 Days
• Field of Search: 102/204, 102/430, 102/447, 102/464-470, 102/472, 102/520, 102/523, 102/530, 102/531, 102/532, 227/9, 227/10, 227/11, 60/632, 60/637, 60/638, 89/1.14
• US Class Current: 102/531
• CPC Class Codes: B25C 1/163 Cartridges
• CPC Class Codes: F42B 8/04 Blank cartridges, i.e. primed cartridges without projectile but containing an explosive or combustible powder charge

Abstract

A cartridge for a powder actuated tool having a cartridge case, a powder propellant, a bushing, and a piston. The piston has a tapered outer diameter that is larger in a rear end of the piston and is compressed inward by the cartridge case. A port extends through the piston and has an entrance to the port at a rear end of the piston with a semi-spherical shape to slow gas flow rate passing through the port and reduce the amount of propellant residue passing through the port. The piston has a main section and a cantilevered section. The cantilevered section has a general ring shape and forms a portion of the outer diameter of the piston.

Claims

1. In a cartridge for a powder actuated tool, the cartridge having a cartridge case, a propellant, a bushing, and a piston, the improvement comprising:

the piston having a tapered outer diameter that is larger in a rear end of the piston and is compressed inward by the cartridge case, wherein the piston has a port therethrough and a semi-spherical entrance to the port at the rear end of the piston.

2. A cartridge as in claim 1 wherein the piston has a main section and a general ring shaped cantilever section, the cantilever section forming at least a portion of the outer diameter of the piston.

3. A cartridge as in claim 2 wherein a portion of the main section is located inside the ring shape of the cantilever section.

4. A cartridge as in claim 1 wherein the outer diameter is tapered at an angle of about 1.7°

along the length of the piston.

5. In a cartridge for a powder actuated tool, the cartridge having a cartridge case, a propellant, a bushing and a piston having a port therethrough, the improvement comprising:

the piston having an entrance to the port at a rear end of the piston with a semi-spherical shape to gas flow rate passing through the port and reduce the amount of propellant residue passing through the port.

6. A cartridge as in claim 5 wherein the piston has a main section with the port and entrance located therein, and a deflectable cantilever ring section surround a portion of the main section.

7. A cartridge as in claim 6 wherein the ring section has an outer diameter that increases towards the rear end of the piston.

8. A cartridge as in claim 7 wherein the outer diameter increases at an angle of about 1.7°

.

9. A cartridge as in claim 7 wherein the ring section is compressed and slightly deflected by walls of the cartridge case.