Patent US3900973A successfully refreshed from Google Patents.
US3900973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrading machine
Assignee: Machinefabriek A Van der Linden BV
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Filing: 1973-12-18
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Granted: 1975-08-26
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Expires: 1993-12-18
Abstract
Abstract The oscillatory movement of the abrasive belt of an abrading machine is detected by a pneumatic sensor and controlled by a pneumatic system. Disturbance of the operation of said machine due to abrasive dust deposited in the pneumatic system is prevented due to a motor chamber of a pneumatic motor communicating with a compressed-air source through a choke of a regulator and with an air exhaust that is alternately closed and opened by a sensor-actuated flap of the regulator.
Inventors
- 👤 Der Linden Jacob Arie Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:47
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
211 words
An abrading machine for abrading work pieces comprising at least one frame, a guide table connected with said frame for guiding the work pieces to be abrased, a pressing member having an endless abrading belt associated therewith, said pressing member urging said belt against the work pieces, an auxiliary frame disposed adjacent the pressing member, a reversing roller rotatably journalled in said auxiliary frame and pivotable relative to said frame about a pivotal axis transverse of the rotary axis of the reversing roller a pneumatic motor for performing an oscillatory movement about the pivotal axis, said pneumatic motor coupling the reversing roller to said auxiliary frame a pneumatic sensor for detecting the presence or absence of the edge of the abrading belt, said pneumatic sensor including a sensoractuated regulating device for controlling the pneumatic motor, said pneumatic motor having at least one motor chamber which communicates through the sensor-actuated regulating device with a compressed-air source and with an air exhaust, characterized in that the sensor-actuated regulating device is provided with a choke and a sensor activated flap, the motor chamber of the pneumatic motor communicating with the compressedair source through said choke and with said air exhaust which is alternately closed and opened by said sensor-activated flap of the regulating device.
Claim 2
Dependent Claim
211 words
An abrading machine for abrading work pieces comprising at least one frame, a guide table connected with said frame for guiding the work pieces to be abrased, a pressing member having an endless abrading belt associated therewith, said pressing member urging said belt against the work pieces, an auxiliary frame disposed adjacent the pressing member, a reversing roller rotatably journalled in said auxiliary frame and pivotable relative to said frame about a pivotal axis transverse of the rotary axis of the reversing roller a pneumatic motor for performing an oscillatory movement about the pivotal axis, said pneumatic motor coupling the reversing roller to said auxiliary frame a pneumatic sensor for detecting the presence or absence of the edge of the abrading belt, said pneumatic sensor including a sensoractuated regulating device for controlling the pneumatic motor, said pneumatic motor having at least one motor chamber which communicates through the sensor-actuated regulating device with a compressed-air source and with an air exhaust, characterized in that the sensor-actuated regulating device is provided with a choke and a sensor activated flap, the motor chamber of the pneumatic motor communicating with the compressedair source through said choke and with said air exhaust which is alternately closed and opened by said sensor-activated flap of the regulating device.
Claim 3
Dependent Claim
70 words
An abrading machine as claimed in claim 1, characterized in that the pneumatic motor has two motor chambers and the sensor-actuated regulating device communicates with the compressed-air source, said compressed-air source being provided with two air branches, each of said branches communicating through said choke with one of said motor chambers of the pneumatic motor, each of said air branches being alternately closed and opened, respectively by the sensor-actuated flap.
Claim 4
Dependent Claim
47 words
An abrading machine as claimed in claim 1, characterized in that at least one chamber of the pneumatic motor contains a spring and a pressure-control means is included in the compressed-air supply, so that the stroke of the pneumatic motor is adjustable by said pressure control means.
Claim 5
Dependent Claim
49 words
An abrading machine as claimed in claim 1, characterized in that a vertical pin is connected with the auxiliary frame by a coupling element which is adapted to pivot about a vertical pivotal axis, said pneumatic motor being arranged parallel to the reversing roller and engaging said vertical pin.
Claim 6
Dependent Claim
18 words
An abrading machine as claimed in claim 1, wherein the auxiliary frame is disposed above the pressing member.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |