US3717894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge guard for buffing machine
Assignee: PIT BAR Mfg CO
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Filing: 1971-05-06
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Granted: 1973-02-27
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Expires: 1991-05-06
Abstract
Abstract The present invention discloses an edge guard for a buffer pad. The buffed pad is formed of a canvas backing provided with a nap of wool on the front working surface thereof. The edge guard is similarly formed of a canvas backing with a wool nap, but the nap therefor is on the back surface of the canvas backing and only extends about an annular area adjacent to the outer circumference thereof. During the assembly of the buffer pad on a circular rubber back-up disc that is used for holding the buffer pad on the projecting end of a driving spindle, the edge guard pad is first positioned on the back-up disc with the back surface of its canvas backing against the back-up disc such that the annular area provided with the nap of wool surrounds and extends beyond the outer circumferential edge of the back-up disc. Then the buffer pad is positioned on the back-up disc with the back surface of its canvas backing against the front surface of the edge guard pad. The assembly is then fastened together by a clamping nut.
Inventors
- 👤 O Wakefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:29
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4036; A47L11/4038; A47L11/02; A47L11/10; A47L11/14; A47L11/16; A47L11/164; B; B24; B24D; B24D13/00; B24D13/14; B24D13/145
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
A buffing device comprising: a buffer pad including a circular canvas backing and a nap of wool attached to the front surface of said backing; an edge guard pad having a circular canvas backing of comparable size to said canvas backing of said buffer pad, and having a nap of wool attached to the outer annular area of the rear surface of its said circular canvas backing; said pads being assembled with the front surface of the canvas backing for said edge guard pad engaging the rear surface of the canvas backing for said buffer pad, the nap on the outer circumferential edge of the front surface of said buffer pad and the nap on the outer circumferential edge of the rear surface of said edge guard pad both tending to lean radially outward such that they meet in the common plane of the canvas backings and thereby protect any object being buffed from being directly engaged by the circumferential edges of said canvas backings; a resilient circular backup plate having a radius equal to the inner radius of the outer annular area of the rear surface of said edge guard pad, said backup plate being in engagement with said rear surface; and fastening means coupling the centers of said buffeR pad, said edge guard pad, and said backup plate to each other, and adapted for attachment to the end of a rotatable drive shaft.
Claim 2
Dependent Claim
235 words
A buffing device comprising: a buffer pad including a circular canvas backing and a nap of wool attached to the front surface of said backing; an edge guard pad having a circular canvas backing of comparable size to said canvas backing of said buffer pad, and having a nap of wool attached to the outer annular area of the rear surface of its said circular canvas backing; said pads being assembled with the front surface of the canvas backing for said edge guard pad engaging the rear surface of the canvas backing for said buffer pad, the nap on the outer circumferential edge of the front surface of said buffer pad and the nap on the outer circumferential edge of the rear surface of said edge guard pad both tending to lean radially outward such that they meet in the common plane of the canvas backings and thereby protect any object being buffed from being directly engaged by the circumferential edges of said canvas backings; a resilient circular backup plate having a radius equal to the inner radius of the outer annular area of the rear surface of said edge guard pad, said backup plate being in engagement with said rear surface; and fastening means coupling the centers of said buffeR pad, said edge guard pad, and said backup plate to each other, and adapted for attachment to the end of a rotatable drive shaft.
Claim 3
Dependent Claim
202 words
A buffing machine of the type used in the automotive service field and for other purposes including: a buffer pad comprising a circular canvas backing provided with a nap of wool on the front surface thereof, an edge guard pad comprising a circular canvas backing provided with a nap of wool on the outer annular area of the rear surface thereof, said pads being assembled with the rear surface of the canvas backing for the buffer pad held adjacent the front surface of the canvas backing for the edge guard pad, the nap on the outer circumferential edge of the front surface of the buffer pad and the nap on the outer circumferential edge of the rear surface of the edge guard pad tending to lean radially outwardly such that they meet in the common plane of the canvas backings for the pads and thereby provide for covering the circumferential edge of said buffer pad, a circular backup plate for said buffer pad, and said circular backup plate having a radius equal to the inner radius of the outer annular area on the rear surface of the canvas backing of the edge guard pad that is provided with a nap of wool.
Claim 4
Dependent Claim
202 words
A buffing machine of the type used in the automotive service field and for other purposes including: a buffer pad comprising a circular canvas backing provided with a nap of wool on the front surface thereof, an edge guard pad comprising a circular canvas backing provided with a nap of wool on the outer annular area of the rear surface thereof, said pads being assembled with the rear surface of the canvas backing for the buffer pad held adjacent the front surface of the canvas backing for the edge guard pad, the nap on the outer circumferential edge of the front surface of the buffer pad and the nap on the outer circumferential edge of the rear surface of the edge guard pad tending to lean radially outwardly such that they meet in the common plane of the canvas backings for the pads and thereby provide for covering the circumferential edge of said buffer pad, a circular backup plate for said buffer pad, and said circular backup plate having a radius equal to the inner radius of the outer annular area on the rear surface of the canvas backing of the edge guard pad that is provided with a nap of wool.
Claim 5
Dependent Claim
16 words
The invention in accordance with claim 2 wherein said circular back-up plate is formed of rubber.
Claim 6
Dependent Claim
133 words
The invention in accordance with claim 3 wherein said buffer and edge guard pad assembly is provided with a central opening, wherein said back-up plate is provided with a central opening in line with the central opening of said pad assembly, and wherein said buffing machine includes a driving spindle having a threaded projected end that extends from the rear of said back-up plate through the central opening of said back-up plate and said pad assembly, and a clamping nut provided with a cap, said nut being inserted from the front of said pad assembly into the central opening thereof such as to engage the threaded projected end of said spindle to enable the cap thereon to clamp the inner edge of the central opening of said pad assembly against said back-up plate.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |