Pneumatic spray gun with digital pressure readout
OwnerShiqi Zhuinventor
Life of this patent
Estimating the term…
Abstract
An improved paint spray gun, including high volume and low pressure air paint spray guns, siphon-type paint spray guns, and gravity-fed-type spray guns, having a built-in gas pressure gauge.
Claims18
1). A spray gun comprising:
- liquid container means;
- compressed gas introduction means;
- a chamber in communication with said liquid container means and said compressed gas introduction means;
- said chamber being in communication with a spray nozzle;
- a trigger and trigger mediated valve controlling said compressed gas introduction means;
- and
- gas pressure indicating means, said gas pressure indicating means being in gaseous communication with said compressed gas introduction means at a point generally adjacent said spray nozzle.
2). A spray gun as claimed in claim 1 wherein said gas pressure indicating means is a digital gas pressure indicating means.
3). A spray gun as claimed in claim 1 wherein said gas pressure indicating means indicates a maximum pressure of about 2 bar.
4). A spray gun as claimed in claim 1 wherein said gas pressure indicating means is selected from the group consisting of a piezoresistive strain gauge sensor, a capacitive sensor, an electromagnetic sensor, a piezoelectric sensor, an optical sensor, a potentiometric sensor, a resonant sensor, a thermal sensor, and an ionization sensor.
5). A spray gun as claimed in claim 1 wherein said liquid container means further comprises a siphon-type liquid reservoir means.
6). A spray gun as claimed in claim 1 wherein said liquid container means further comprises a gravity-fed-type liquid hopper means.
7). A spray gun as claimed in claim 1 wherein said spray gun is a high volume low pressure spray gun.
8). A spray gun comprising:
- liquid container means;
- compressed gas introduction means;
- a chamber in communication with said liquid container means and said compressed gas introduction means;
- said chamber being in communication with a spray nozzle;
- a trigger and trigger mediated valve controlling said compressed gas introduction means;
- and
- digital gas pressure indicating means, said digital gas pressure indicating means being in gaseous communication with said compressed gas introduction means at a point generally adjacent said spray nozzle.
9). A spray gun as claimed in claim 8 wherein said gas pressure indicating means indicates a maximum pressure of about 2 bar.
10). A spray gun as claimed in claim 8 wherein said gas pressure indicating means is selected from the group consisting of a piezoresistive strain gauge sensor, a capacitive sensor, an electromagnetic sensor, a piezoelectric sensor, an optical sensor, a potentiometric sensor, a resonant sensor, a thermal sensor, and an ionization sensor.
11). A spray gun as claimed in claim 8 wherein said liquid container means further comprises a siphon-type liquid reservoir means.
12). A spray gun as claimed in claim 8 wherein said liquid container means further comprises a gravity-fed-type liquid hopper means.
13). A spray gun as claimed in claim 8 wherein said spray gun is a high volume low pressure spray gun.
14). A spray gun comprising:
- a spray gun housing;
- liquid container means mounted to said spray gun housing;
- high volume low pressure compressed gas introduction means formed in said housing;
- a chamber in said spray gun housing in communication with said liquid container means and said compressed gas introduction means;
- said chamber being in communication with a spray nozzle;
- a trigger and trigger mediated valve controlling said compressed gas introduction means;
- and
- a digital gas pressure indicating gauge in gaseous communication with said compressed gas introduction means at a point adjacent said spray nozzle.
15). A spray gun as claimed in claim 14 wherein said gas pressure indicating gauge indicates a maximum pressure of about 2 bar.
16). A spray gun as claimed in claim 14 wherein said liquid container means is a siphon-type liquid reservoir means.
17). A spray gun as claimed in claim 14 wherein said liquid container means is a gravity-fed-type liquid hopper means.
18). A spray gun as claimed in claim 14 wherein a battery to power said digital gas pressure measuring gauge is mounted in said housing and is electrically connected to said digital gas pressure measuring gauge.