US3914815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe inside cleaning device
Assignee: Fuji Seiki Machine Works Ltd
•
Filing: 1974-09-20
•
Granted: 1975-10-28
•
Expires: 1994-09-20
Abstract
Abstract Apparatus for cleaning the inside surface of a tubular workpiece such as a pipe by blasting the workpiece surface with an abrasive slurry. The slurry is impelled by a gas supplied by a mechanism designed to impart a pulsating pressure to the blasting nozzle. One disclosed embodiment of the invention utilizes a mechanical rotary valve combined with an accumulator and another embodiment utilizes a reciprocating piston for imposing a relative high pressure onto a quantity of impelling gas and then suddenly releasing it to the blasting nozzle.
Inventors
- 👤 Shigeharu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/32; B24C3/325; B24C3/327
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
An apparatus for utilizing an abrasive slurry for cleaning the inside of a tubular workpiece, such as a pipe, and having a nozzle for introducing a supply of impelling gas such as air into an abrasive slurry for directing same under pressure and with a high degree of turbulence into the interior of said tubular workpiece, the improvement in means for supplying said impelling gas comprising; means for supplying gas under pressure to said nozzle at a constant minimum value and including means for intermittently raising said pressure.
Claim 2
Independent Claim
88 words
An apparatus for utilizing an abrasive slurry for cleaning the inside of a tubular workpiece, such as a pipe, and having a nozzle for introducing a supply of impelling gas such as air into an abrasive slurry for directing same under pressure and with a high degree of turbulence into the interior of said tubular workpiece, the improvement in means for supplying said impelling gas comprising; means for supplying gas under pressure to said nozzle at a constant minimum value and including means for intermittently raising said pressure.
Claim 3
Dependent Claim
33 words
The device of claim 1 wherein said means for raising said Pressure does so at a smoothly modulated curve for both the ascending side of the pressure pulse and the descending side thereof.
Claim 4
Dependent Claim
86 words
The device of claim 2 wherein said means for raising said pressure comprises an intermittently open and closed valve and an accumulator, the pressure source feeding said impelling gas through said valve into said accumulator and the gas flowing out of said accumulator to said nozzle, the volume of said accumulator being so correlated to the volume of flow of said gas that there is a constant flow of gas therethrough with pressure peaks at the outlet thereof corresponding to the open positions of said valve.
Claim 5
Dependent Claim
16 words
The device of claim 3 wherein said intermittently open and closed valve is a rotary valve.
Claim 6
Dependent Claim
47 words
The device of claim 1 including a source and conduit means supplying impelling gas from said source to said nozzle, accumulating means for accumulating gas and supplying same into said conduit means as a pulse at a higher pressure than the normal pressure within said conduit means.
Claim 7
Dependent Claim
65 words
The device of claim 1 including a source of gas under pressure and first conduit means for conducting same from said source to said nozzle; an accumulator for accumulating a quantity of said gas; piston means including force magnification means; and gas pressure means intermittently operable for energizing said piston means to impel a pulse of gas from said accumulating means into said conduit means.
Claim 8
Dependent Claim
143 words
The device of claim 1 including conduit means for conducting impelling gas from a source of pressure to said nozzle; a chamber having a first diameter and said conduit means connected thereto so the gas flowing through said conduit means will also fill said chamber; a check valve preventing flow of gas from said chamber back toward said source; pressure responsive means including a cylinder and piston of diameter larger than that of said chamber; and conduit and valve means deriving pressure from said source and intermittently supplied to said cylinder; whereby gas so supplied to said cylinder will create a force therein of sufficient magnitude to actuate said piston to create in said first chamber a pressure in excess of the pressure of said source and drive a pulse of gas from said chamber into said conduit and thence to said nozzle.
References Cited (Backward Citations)
US2696049A
Cited
US3109262A
Cited
US3299459A
Cited
US3427763A
Cited
US3783867A
Cited
US3771517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |