Patent US3628627A successfully refreshed from Google Patents.
US3628627A
Expired / Lapsed
US
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Silencer for air-blasting gun
Assignee: Vacu Blast Corp
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Filing: 1970-10-02
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Granted: 1971-12-21
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Expires: 1990-10-02
Abstract
Abstract A silencer adapted to be attached to an abrasive blasting gun comprises a tapered end portion and a straight barrel portion. The end portion forms an annular tapered airspace around the outlet of the blast-gun exit opening which helps to absorb energy from the air-abrasive stream and suppresses the sound produced at the exit end of the silencer.
Inventors
- 👤 Ted A Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
B; B24; B24C; B24C5/00; B24C5/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A silencer device for reducing the level of sound produced by an abrasive blast gun having an exit opening with a diameter ''''A, '''' said device comprising: an inlet end portion with a tapered bore having a diameter substantially larger than ''''A'''' and a conical inner surface that converges forwardly to a smaller diameter but still larger than ''''A,'''' thereby being adapted to form an annular airspace around the exit opening of the gun aligned with the device; and an extended barrel portion integral with said end portion and having a cylindrical bore with a diameter equal to said smaller diameter and extending from said tapered bore to an exit opening.
Claim 2
Dependent Claim
111 words
A silencer device for reducing the level of sound produced by an abrasive blast gun having an exit opening with a diameter ''''A, '''' said device comprising: an inlet end portion with a tapered bore having a diameter substantially larger than ''''A'''' and a conical inner surface that converges forwardly to a smaller diameter but still larger than ''''A,'''' thereby being adapted to form an annular airspace around the exit opening of the gun aligned with the device; and an extended barrel portion integral with said end portion and having a cylindrical bore with a diameter equal to said smaller diameter and extending from said tapered bore to an exit opening.
Claim 3
Dependent Claim
37 words
The device as described in claim 1 wherein said inlet end portion with a cylindrical cavity axially aligned with the larger end of said tapered bore and adapted to receive the cylindrical end of a blast gun.
Claim 4
Dependent Claim
41 words
The device as described in claim 2 including a tungsten-carbide liner of substantially uniform thickness within said tapered bore and said cylindrical bore, said liner within said tapered bore forming a shoulder for locating the blast gun axially within said cavity.
Claim 5
Dependent Claim
62 words
The device as described in claim 2 wherein the larger diameter of said tapered bore is around 2.4 times the diameter ''''A,'''' its smaller diameter and the diameter of the cylindrical bore is around 1.6 times the diameter ''''A,'''' the length of said tapered bore is around 2.5 and the length of said cylindrical bore is around 7 times the diameter ''''A.''''
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |