US3834082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive blasting system with personnel protective features
Assignee: EMPIRE ABRASIVE EQUIPMENT COMPANY LP
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Filing: 1972-12-14
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Granted: 1974-09-10
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Expires: 1992-12-14
Abstract
Abstract An abrasive blasting system comprising a tank for holding an abrasive material therein and a high pressure air-line for carrying abrasive from the tank to an article to be abraded. In one embodiment, a fluid controlled valve is provided connected between the tank and the air-line at a point in the line and a second fluid controlled valve is connected in the air-line upstream of the first valve. Both valves are controlled by a pilot valve disposed adjacent to tank. The pilot valve is operative when pressurized to open both controlled valves. A remote control valve is provided adjacent the downstream end of the air-line and includes a first port connected via a first control air-line to the air-line and a second port connected via a second control air-line to the pilot valve. Means are provided to connect the first and second ports together to thereby pressurize the pilot valve. The pilot valve includes means for venting the second control air-line to the atmosphere. In another embodiment, a manually operable valve is provided for providing abrasive into the air-line and a diaphragm valve is provided in the air-line upstream of the manually operable valve. The diaphragm valve includes an inlet port, an outlet port, the inlet port being upstream of the outlet port, a control outlet port connected to the inlet port and to a first control air-line, a control inlet port connected to a diaphragm chamber and to a second control air-line and a venting port connected to said chamber. The diaphragm valve is operative when pressurized via the connection of the first and second ports in a remote control valve connected to said control lines to connect the inlet and outlet ports in the diaphragm valve together. A second diaphragm valve is provided to vent the tank when said first mentioned diaphragm valve is depressurized.
Inventors
- 👤 M Grudzinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:37
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0046; B24C5/00; B24C5/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
263 words
An abrasive blasting system comprising a high pressure airline having a downstream end, an abrasive tank having an abrasive outlet, a first valve connected between said outlet and said airline, a second controlled, fluid pressure operated valve connected in said air-line upstream of said first valve and operative when opened to enable high pressure air to flow through the high pressure air-line, master fluid pressure operating means located adjacent said tank and operative when pressurized for causing said second controlled valve to open and a remote control valve for controlling fluid flow to said master fluid pressure operated means, said remote control valve being located adjacent the downstream end of said air-line and including a first port connected via a first control air-line to a source of high pressure air, a second port connected via a second control airline to said master fluid pressure-operated means and manually operable means for connecting said first port to said second port, whereupon said master fluid pressure operated means is pressurized via said first and second control air-lines, said master fluid pressure operated means including bleed off means for veNting the air in said second control air-line to the atmosphere at all times, with the rate of venting being small enough that when the first and the second ports are connected together the master fluid pressure-operated means remains pressurized to cause the second control valve to be opened and when said first and said second ports are disconnected from one another said master fluid pressure means depressurizes and thereby effects the closing of the second control valve.
Claim 2
Dependent Claim
263 words
An abrasive blasting system comprising a high pressure airline having a downstream end, an abrasive tank having an abrasive outlet, a first valve connected between said outlet and said airline, a second controlled, fluid pressure operated valve connected in said air-line upstream of said first valve and operative when opened to enable high pressure air to flow through the high pressure air-line, master fluid pressure operating means located adjacent said tank and operative when pressurized for causing said second controlled valve to open and a remote control valve for controlling fluid flow to said master fluid pressure operated means, said remote control valve being located adjacent the downstream end of said air-line and including a first port connected via a first control air-line to a source of high pressure air, a second port connected via a second control airline to said master fluid pressure-operated means and manually operable means for connecting said first port to said second port, whereupon said master fluid pressure operated means is pressurized via said first and second control air-lines, said master fluid pressure operated means including bleed off means for veNting the air in said second control air-line to the atmosphere at all times, with the rate of venting being small enough that when the first and the second ports are connected together the master fluid pressure-operated means remains pressurized to cause the second control valve to be opened and when said first and said second ports are disconnected from one another said master fluid pressure means depressurizes and thereby effects the closing of the second control valve.
Claim 3
Dependent Claim
42 words
The system as specified in claim 1 wherein said master fluid pressure operated means is a pilot valve, and wherein said first valve is a controlled fluid pressure operated valve which is opened in response to the pressurization of said pilot valve.
Claim 4
Dependent Claim
45 words
The system as specified in claim 2 wherein the interior of said tank is connected to said air-line upstream of said second controlled valve to result in the pressurization of said tank irrespective of whether or not said first and said second valves are opened.
Claim 5
Dependent Claim
121 words
The system as specified in claim 3 wherein said pilot valve comprises an inlet port which is connected to said high pressure air-line, an outlet port which is connected via a third control air-line to said first and said second valves, and exhaust port, a pilot port which is connected to said second control air-line and movable poppet, said poppet being arranged to move to a position to isolate said outlet port from said inlet port when said pilot valve is pressurized and to move to a position to connect said outlet port to said exhaust port when said pilot line is depressurized, said poppet including an orifice enabling said pilot port to communicate with said exhaust port at all times.
Claim 6
Dependent Claim
19 words
The system as specified in claim 4 wherein said orifice is of smaller diameter than the said pilot air-port.
Claim 7
Dependent Claim
22 words
The system as specified in claim 5 wherein said first and said second valves are diaphragm valves which are closed when pressurized.
Claim 8
Dependent Claim
229 words
An abrasive blasting system comprising a high pressure air-line having a downstream end, an abrasive tank having an abrasive outlet, a first valve connected between said outlet and said air-line, a second controlled, fluid pressure operated valve connected in said air-line upstream of said first valve and operative when opened to enable high pressure air to flow through the high pressure air-line, master fluid pressure operated means located adjacent said tank and operative when pressurized for causing said second controlled valve to open and a remote control valve for controlling fluid flow through said master fluid pressure operated means, said remote control valve being located adjacent the downstream end of said air-line and including a first port connected via a first control air-line to a source of high pressure air, a second port connected via a second control air-line to said master fluid pressure operated means and manually operable means for connecting said first port to said second port, whereupon said master fluid pressure operated means is pressurized via said first and second control air-lines, said master fluid pressure operated means including means for venting said second control air-line to the atmosphere, said master fluid control means being a diaphragm chamber of a diaphragm valve, said second controlled fluid pressure means comprising the remaining portion of said diaphragm valve and wherein said first valve is a manually operable valve.
Claim 9
Dependent Claim
229 words
An abrasive blasting system comprising a high pressure air-line having a downstream end, an abrasive tank having an abrasive outlet, a first valve connected between said outlet and said air-line, a second controlled, fluid pressure operated valve connected in said air-line upstream of said first valve and operative when opened to enable high pressure air to flow through the high pressure air-line, master fluid pressure operated means located adjacent said tank and operative when pressurized for causing said second controlled valve to open and a remote control valve for controlling fluid flow through said master fluid pressure operated means, said remote control valve being located adjacent the downstream end of said air-line and including a first port connected via a first control air-line to a source of high pressure air, a second port connected via a second control air-line to said master fluid pressure operated means and manually operable means for connecting said first port to said second port, whereupon said master fluid pressure operated means is pressurized via said first and second control air-lines, said master fluid pressure operated means including means for venting said second control air-line to the atmosphere, said master fluid control means being a diaphragm chamber of a diaphragm valve, said second controlled fluid pressure means comprising the remaining portion of said diaphragm valve and wherein said first valve is a manually operable valve.
Claim 10
Dependent Claim
38 words
The system as specified in claim 7 wherein the interior of said tank is connected to said air-line downstream of said diaphragm valve to result in the pressurization of said tank only when said diaphragm valve is opened.
Claim 11
Dependent Claim
132 words
The system as specified in claim 8 wherein said diaphragm valve includes an inlet port connected to said air-line at an upstream point, an outlet port connected to said air-line downstream of said upstream point, a control outlet port connected to said inlet port and said first control air-line, a control inlet port connected to said second control air-line and said diaphRagm chamber, an exhaust port connected to said diaphragm chamber and a movable diaphragm separating said diaphragm chamber from the remaining portion of said diaphragm valve, said diaphragm being moved to a position to connect said outlet port to said inlet port when said controlled inlet port is pressurized and to move to a position to disconnect said inlet port from said outlet port when said controlled inlet port is depressurized.
Claim 12
Dependent Claim
20 words
The system as specified in claim 9 wherein said exhaust port is of smaller diameter than said inlet control port.
Claim 13
Dependent Claim
36 words
The system as specified in claim 10 additionally comprising a venting diaphragm valve which is connected to said tank and to said control inlet port to vent said tank when said control inlet port is depressurized.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |