Compression structure of a spray gun

Details Compression structure of a spray gun Compression structure of a spray gun

2002-04-29

2003-03-04

Mar, Michael (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Including supply holder for material

Moving solid surface engages material to be sprayed

C239S571000, C222S207000, C222S209000, C222S214000

Reexamination Certificate

active

06527202

ABSTRACT:

RELATED U.S. APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
The present invention relates generally to a spray gun more particularly to a compression structure of the spray gun.
BACKGROUND OF THE INVENTION
As shown in
FIGS. 1 and 2
, a spray gun of the prior art comprise a main body
10
which is provided in the interior with a guide tube
11
, an upright tube
12
, and a compression tube
13
. The guide tube
11
is connected at the front end with a discharge tube
14
which is connected with a spray head
15
. The guide tube
11
is in communication with the upright tube
12
via a through hole
16
. Located between the front end of the interior of the guide tube
11
and the discharge tube
14
is a stop pin
18
, which is urged by a C-shaped elastic piece
17
. The compression tube
13
is provided at the inner end with a through hole
29
in communication with the upright tube
12
. A piston
30
is received in the outer end of the compression tube
13
in conjunction with a metal spring
31
. A trigger lever
32
is fastened pivotally with the main body
10
such that the trigger lever
32
is contiguous to the spray head
15
, and that the trigger lever
32
presses against a rod portion
33
of the piston
30
. As the trigger lever
32
is activated to actuate the piston
30
, the pressure is built up in the compression tube
13
. As a result, the spray head
15
disperses the contents of a container in the form of a spray by the air pressure in the compression tube
13
which serves as a compressor.
With the exception of the metal spring
31
, all component parts of the prior art spray gun are made of a plastic material, which is recyclable. It is time-consuming to remove the metal spring
31
from a discarded spray gun in the recycling process. In addition, the prior art spray gun is defective in design in that the rod portion
33
of the piston
30
is apt to sway at the time when it is pressed against by the trigger lever
32
, thereby resulting in poor performance of the spray gun.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a spray gun with a compression structure devoid of a metal spring, so as to facilitate the recycling of the spray gun.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by the compression structure comprising a compression tube which is in communication with an upright tube which is in turn in communication with a guide tube. The guide tube is in communication with a spray head. The compression tube is provided with an elastic tube fitted thereinto. The elastic tube has a closed outer end. A connection rod is connected at an inner end with the outer end of the elastic tube such that an outer end of the connection rod is pivoted with a trigger lever. The elastic tube serves as a piston, which is actuated by the trigger lever via the connection rod to compress fluid, thereby enabling the spray head to disperse the contents of a container in the form of a spray by the fluid pressure.


REFERENCES:
patent: 3973700 (1976-08-01), Schmidt et al.
patent: 4225061 (1980-09-01), Blake et al.
patent: 4260079 (1981-04-01), Cary et al.
patent: 5114052 (1992-05-01), Tiramani et al.
patent: 5439178 (1995-08-01), Peterson

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