Patent US3728821A successfully refreshed from Google Patents.
US3728821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for finishing surfaces
Assignee: Dynetics Corp
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Filing: 1971-09-13
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Granted: 1973-04-24
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Expires: 1991-09-13
Abstract
Abstract A machine including two hollow members, each divided into two chambers with a diaphragm being the divider between the chambers, one of the chambers of each of the devices adapted to receive fluid to push the diaphragm in a direction to force abrasive material adapted to be held in the second chamber through an orifice extending outwardly from the second chamber, and a baffle positioned in the orifice to prevent expansion of the diaphragm through said orifice and to direct the flow of abrasive material into said second chamber when said hollow members are positioned to cooperatively move abrasive material through a workpiece held between the orifices of said members.
Inventors
- 👤 K Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:23
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/10; B24B31/116
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
In a machine for smoothing and removing material from an article which includes a container having a passageway for receiving a quantity of flowable abrasive composition, a diaphragm within the container for supporting the composition and for pushing the same through the passageway, the improvement comprising baffle means positioned within the passageway for limiting the expansion of the diaphragm into the passageway, said means also shaped to cause the composition to be mixed as composition flows into the container through the passageway.
Claim 2
Dependent Claim
82 words
In a machine for smoothing and removing material from an article which includes a container having a passageway for receiving a quantity of flowable abrasive composition, a diaphragm within the container for supporting the composition and for pushing the same through the passageway, the improvement comprising baffle means positioned within the passageway for limiting the expansion of the diaphragm into the passageway, said means also shaped to cause the composition to be mixed as composition flows into the container through the passageway.
Claim 3
Dependent Claim
33 words
In a machine according to claim 1 in which the baffle is in the shape of a plate having top and bottom surfaces and sloping sidewall means between said top and bottom surfaces.
Claim 4
Dependent Claim
19 words
In a machine according to claim 2 in which the baffle is in the shape of a truncated cone.
Claim 5
Dependent Claim
20 words
In a machine according to claim 2 in which the baffle is wider at its surface closest to the diaphragm.
Claim 6
Dependent Claim
149 words
A machine for forcing an abrasive composition back and forth through or about a workpiece, said machine comprising a pair of containers, each of said containers having a diaphragm therein which separates the containers into two chambers, one for holding the abrasive composition and the others for holding fluid to move the diaphragm back and forth, a passageway coupled to each of said containers for the entry and exit of the abrasive composition into and out of said chamber for holding the abrasive composition, means for positioning a workpiece between said passageways to permit the flow of abrasive composition from one container to the other container, and baffle means positioned in the passageways leading into each container for limiting the expansion of said diaphragm as it pushes abrasive composition through said passageways, said baffle also shaped to mix the abrasive composition uniformly as it flows into the container chambers.
Claim 7
Dependent Claim
149 words
A machine for forcing an abrasive composition back and forth through or about a workpiece, said machine comprising a pair of containers, each of said containers having a diaphragm therein which separates the containers into two chambers, one for holding the abrasive composition and the others for holding fluid to move the diaphragm back and forth, a passageway coupled to each of said containers for the entry and exit of the abrasive composition into and out of said chamber for holding the abrasive composition, means for positioning a workpiece between said passageways to permit the flow of abrasive composition from one container to the other container, and baffle means positioned in the passageways leading into each container for limiting the expansion of said diaphragm as it pushes abrasive composition through said passageways, said baffle also shaped to mix the abrasive composition uniformly as it flows into the container chambers.
Claim 8
Dependent Claim
24 words
A machine according to claim 5 in which means are positioned for forcing said diaphragms to move to force abrasive composition through said passageways.
Claim 9
Dependent Claim
35 words
A machine according to claim 5 in which said baffle means are positioned in the passageways so that the abrasive composition flows between the sidewall of the baffle and the inner wall of the passageway.
Claim 10
Dependent Claim
31 words
A machine according to claim 7 in which in each passageway the part of the baffle facing the diaphragm is wider than the top thereof positioned farthest away from the diaphragm.
Claim 11
Dependent Claim
18 words
A machine according to claim 8 in which the baffle is in the shape of a truncated cone.
Claim 12
Dependent Claim
28 words
A machine according to claim 1 in which the baffle means includes a sidewall which slopes and is substantially parallel to the inner wall surface of the passageway.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |