US3840976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of piercing holes in sanding discs
Assignee: Individual
•
Filing: 1973-07-16
•
Granted: 1974-10-15
•
Expires: 1993-07-16
Abstract
Abstract A sanding tool having a power driven circular backing structure or carrier for driving a circular sanding disc, with the backing structure containing openings through which air and abraded particles can be drawn by suction from a work surface to a collection location, and with a piercing tool being provided and adapted to be positioned opposite the backing structure in a predetermined located relation with respect thereto and to pierce apertures in the sanding disc communicating with the openings in the backing structure.
Inventors
- 👤 A Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:10
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/008; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
The method that comprises: attaching an essentially circular sheet of abrasive material to an essentially circular power driven backing structure of a sander which contains suction openings in the backing structure for drawing air and abraded particles from a work surface, positioning opposite said backing structure and carried abrasive sheet a piercing tool having projections arranged in a pattern corresponding to the pattern of said openings in the backing structure, and with the piercing tool turned about the center of said essentially circular backing structure and abrasive sheet to a position in which said projections are directly opposite said openings in the backing structure, and moving said piercing tool and said backing structure relatively axially toward one another to pierce holes in the abrasive sheet by said projections at the locations of said openings in the backing structure.
Claim 2
Independent Claim
138 words
The method that comprises: attaching an essentially circular sheet of abrasive material to an essentially circular power driven backing structure of a sander which contains suction openings in the backing structure for drawing air and abraded particles from a work surface, positioning opposite said backing structure and carried abrasive sheet a piercing tool having projections arranged in a pattern corresponding to the pattern of said openings in the backing structure, and with the piercing tool turned about the center of said essentially circular backing structure and abrasive sheet to a position in which said projections are directly opposite said openings in the backing structure, and moving said piercing tool and said backing structure relatively axially toward one another to pierce holes in the abrasive sheet by said projections at the locations of said openings in the backing structure.
Claim 3
Dependent Claim
48 words
The method as recited in claim 1, including locating said piercing tool relative to said backing structure by moving and turning the piercing tool to a position in which locating means on the piercing tool interfit in predetermined locating relation with coacting locating means on the backing structure.
Claim 4
Dependent Claim
61 words
The method as recited in claim 1, in which said tool is positioned by first engaging locating means on said tool with the periphery of said backing structure, and then turning said tool relative to said backing structure about the axis of said backing structure until said locating means interfit with coacting locating means on said periphery of the backing structure.
References Cited (Backward Citations)
US1800341A
Cited
US2115543A
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US2160374A
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US2856680A
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US3638362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |