US4407390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic motor
Assignee: SULLIVAN INDUSTRIES Inc A CORP OF IL
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Filing: 1981-08-07
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Granted: 1983-10-04
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Expires: 2001-08-07
Abstract
Abstract Reciprocating pneumatic motor for rock drills and the like wherein a freely-movable hammer piston repeatedly strikes the end of a drill rod, usually a rotating drill rod. Fluid under pressure enters a single, central inlet port in the wall of a cylinder which houses the piston with alternate cycling ports being incorporated into the piston itself. Also disclosed is a novel muffler for such a pneumatic motor.
Inventors
- 👤 Louis H. Le Blanc, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:42
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/11; B25D17/12; E; E21; E21B; E21B1/00; E21B1/12; E21B1/24; E21B1/30; F; F01; F01N; F01N13/00; F01N13/001; Y; Y10; Y10S; Y10S173/00; Y10S173/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
In a pneumatic motor having cylinder means, a piston reciprocable within said cylinder means, ports in the wall of said cylinder through which exhaust gas passes, and a muffler surrounding said cylinder for receiving said exhaust gas, the improvement in said muffler comprising: an annular wall of resilient material surrounding said cylinder means; annular spacers separating said wall from said cylinder means; openings in said spacers through which exhaust gas can pass, said opening in at least some spacers being displaced about the cylinder axis with respect to the opening in a next adjacent spacer, whereby exhaust air will after passing in a generally longitudinal direction with respect to said cylinder axis flow generally circumferentially to the next said opening, and an opening in said annular wall through which exhaust gas passes to the atmosphere after passing through the openings in said spacers.
Claim 2
Dependent Claim
143 words
In a pneumatic motor having cylinder means, a piston reciprocable within said cylinder means, ports in the wall of said cylinder through which exhaust gas passes, and a muffler surrounding said cylinder for receiving said exhaust gas, the improvement in said muffler comprising: an annular wall of resilient material surrounding said cylinder means; annular spacers separating said wall from said cylinder means; openings in said spacers through which exhaust gas can pass, said opening in at least some spacers being displaced about the cylinder axis with respect to the opening in a next adjacent spacer, whereby exhaust air will after passing in a generally longitudinal direction with respect to said cylinder axis flow generally circumferentially to the next said opening, and an opening in said annular wall through which exhaust gas passes to the atmosphere after passing through the openings in said spacers.
Claim 3
Dependent Claim
26 words
The combination of claim 1 wherein said annular wall includes a pair of elastomer sheets radially spaced from each other to form an annular void therebetween.
Claim 4
Dependent Claim
17 words
The combination of claim 2 including an annular sheath of metallic material disposed within said annular void.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |