US2204372A - Piston for air guns - Google Patents

Description

June 11, 1 940.

. J. J. MGHENRY PISTON FOR AIR GUNS Filed Dec. 19, 1938 FlGJ.

FIGA.

INVENTOR JOHN JMCHENRY a. 51

A TTORNEYS Patented .1... 11, 1940 PISTON FORAIR GUNS John J. McHenry, Detroit, Mich'., assignor to Daisy Manufacturing Company,

Plymouth,

Mich, a corporation of Michigan I 7 Application December 19, 1938, Serial No. 246,716

4 Claims.

The invention relates to pistons for air guns of that type in which the piston proper isprovided with a forwardly extending air tube passing through the abutment forming the forward end of the air chamber and delivering compressed air from said chamber into the barrel. The air tube is'usually attached to the piston by having its rear end inserted into a socket and secured therein by solder. It is, however, necessary to provide 10 a passage for the air from the cylinder into the tube which is usually formed by a drilled port in one side of the tube in close proximity to the piston. 'Thus, this port remains open during the movement of the piston until its stroke is nearly completed, thereby permitting the compressed air to pass through the tube into the barrel. However, this port so weakens the tube that the latter is frequently broken off.

It is the object of the invention to obtain a the tube, and at the same time providing a free passage for the air in the cylinder into the tube.

To this end, the invention consists in the construction as hereinafter set forth. In the drawing:

through the core portion of the piston and the air tube attached thereto. Figure 2 is a section on line 2-2 of Figure .1; Figure 3 is a view similar to Figure 1, showing a slightly modified construction;

Figure 4 is a perspective view of the detached parts of the construction shown in Figure 3;

As has been stated, it is usual to attach the air 36 tube to the core of the piston by providing the latter with a socket in which the end of the tube is soldered. This closes the end of the tube and necessitates the use of the objectionable lateral port. With my improved construction the core 40 member is formed with achannel through the forward end thereof, which communicates with the rear end of the tube and also with the air chamber in front of the piston. As shown in Figure 1, A is a cylindrical core member provided with a peripheral flange B at its forward end, preferably formed by upsetting. C is the air tube upset at its rear end to form a peripheral flange D, and E is a sheet metal stamping surrounding the tube C and provided with a plurality of prongs F clinched about the flange B. As thus far described, the tube C is attached to the core A, but without provision for the passage of air into the tube. For this purpose I form in the forward end of the core member A a channel G 55 which extends transversely thereof and centrally construction dispensing with this lateral port in Figure 1 .is a central longitudinal section communicates with the end of the tube. The outer ends of the channel .register with ports H in the stamping E, thereby permitting free flow of air from the chamber-in front of the piston into the end of the air tube. 5 In the modified construction shown in Figures 3 and 4, in place of the peripheral flange B on the core member, the latter is provided with a head portion I with a' recess J therein forming an annular axially extending flange K. It is also 10 provided with a transverse passage G which extends centrally across the bottom of the recess and through the annuar flange K. L is a disk surrounding the tube C and engaging the flange D thereof, said disk being of a diameter to fit 15 Within the recess J and being cut away at M to .registerwith the passage .G. The flange K is then turned inward to embrace the disk, thereby securing the tube to the core member. There is also a struck-up lug N on the disk L for enter- 20 ing the transverse passage G' and holding the cut away portions M in registration with said passage.

With both of the constructions above described, the walls of the tube are left imperforate from 25 end to end, so that there is nothing toweaken the mechanical strength of said tube. At the same time, free entrance ofair into the end of the tube is permitted during the entire compression stroke of the piston.

What I claim as my invention is:

1. In a piston for air guns, a solid cylindrical core member enlarged and transversely slotted at its forward end, an axially aligned air tube 'with a peripherally flanged rear end abutting against the slotted end of said core member and communicating with said slot, and clamp means coupling said air'tube to said enlarged end of said core member leaving an unobstructed air passage into said slot. 40

2. In a piston for air guns, a solid cylindrical core member peripherally flanged at its forward end and also provided at said forward end with a transversely extending slot, an axially aligned air tube flanged at its rear end abutting against the slotted end of said core member and communicating with said slot, and a member surrounding said air tube having a clinching engagement with the flange of said core member also having a port therethrough'in communication with said slot for passage of air.

3. In a piston for air guns, a solid cylindrical core member having a recess at its forward end with a surrounding annular flange and a slot extending transversely across the bottom of said recess, an axially aligned air tube flanged at its rear end and straddling said slot to abut against the bottom of the recess, and a disk sleeved upon said air tube and fitting within said recess being ported in registration with said slot, said annular flange being closed aboutsaid disk to secure the same.

4. In a piston for air guns, a solid cylindrical core member having a recess at its forward end 1 with a surrounding annular flange and a slot ex-

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