US3934343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cutting circles
Assignee: Lawrence Peska Associates Inc
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Filing: 1974-10-30
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Granted: 1976-01-27
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Expires: 1994-10-30
Abstract
Abstract Disclosed is a device for cutting circles and the like consisting essentially of an adapter for mounting on one leg of a compass and into which is threaded a blade holder provided with a blade.
Inventors
- 👤 Jacek Witecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:19
CPC Classifications
B; B43; B43L; B43L9/00; B43L9/16; B43L9/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A device for cutting circles comprising: a pair of elongated legs; pivot means connecting upper ends of said legs for swinging movements; a pointer carried in the lower end of one of said legs; blade holding means; means for mounting said blade holding means to a lower end of the other of said legs for rotation about the axis of said other leg; a pointed generally planar blade fixedly carried projecting from said blade holding means; said blade holding means having a bore in the lower part thereof, said bore having a threaded upper portion and an unthreaded lower portion, a slitted member having slits at a lower portion thereof for fixedly carrying said blade and outwardly flaring surfaces in the area of said slits, said slitted member further having an upper threaded portion for connection to said threaded portion of said bore, the screwing of said threaded portions together resulting in tightening said flaring surfaces against the unthreaded lower portion of said bore thereby clamping said
Claim 2
Independent Claim
167 words
A device for cutting circles comprising: a pair of elongated legs; pivot means connecting upper ends of said legs for swinging movements; a pointer carried in the lower end of one of said legs; blade holding means; means for mounting said blade holding means to a lower end of the other of said legs for rotation about the axis of said other leg; a pointed generally planar blade fixedly carried projecting from said blade holding means; said blade holding means having a bore in the lower part thereof, said bore having a threaded upper portion and an unthreaded lower portion, a slitted member having slits at a lower portion thereof for fixedly carrying said blade and outwardly flaring surfaces in the area of said slits, said slitted member further having an upper threaded portion for connection to said threaded portion of said bore, the screwing of said threaded portions together resulting in tightening said flaring surfaces against the unthreaded lower portion of said bore thereby clamping said
Claim 3
Independent Claim
148 words
A device for cutting circles comprising: a pair of elongated legs; pivot means connecting upper ends of said legs for swinging movements; a pointer carried in the lower end of one of said legs; blade holding means; means for mounting said blade holding means to a lower end of the other of said legs for rotation about the axis of said other leg; a pointed generally planar blade fixedly carried projecting from said blade holding means; said mounting means comprising a separable connector means carried by said other leg; said connector means including a pin received in socket means carried by said other leg, said pin having a radially projecting shoulder at the lower part thereof; said blade holding means having a cavity in the upper part thereof configured for capture of said shoulder; and a screw carried threadably by said blade holding means for bearing on said
Claim 4
Independent Claim
148 words
A device for cutting circles comprising: a pair of elongated legs; pivot means connecting upper ends of said legs for swinging movements; a pointer carried in the lower end of one of said legs; blade holding means; means for mounting said blade holding means to a lower end of the other of said legs for rotation about the axis of said other leg; a pointed generally planar blade fixedly carried projecting from said blade holding means; said mounting means comprising a separable connector means carried by said other leg; said connector means including a pin received in socket means carried by said other leg, said pin having a radially projecting shoulder at the lower part thereof; said blade holding means having a cavity in the upper part thereof configured for capture of said shoulder; and a screw carried threadably by said blade holding means for bearing on said
Claim 5
Dependent Claim
101 words
The device of claim 2 wherein said blade holding means has a bore in the lower part thereof, said bore having a threaded upper portion and an unthreaded lower portion, a slitted member having slits at a lower portion thereof for fixedly carrying said blade and outwardly flaring surfaces in the area of said slits, said slitted member further having an upper threaded portion for connection to said threaded portion of said bore, the screwing of said threaded portions together resulting in tightening said flaring surfaces against the unthreaded lower portion of said bore thereby clamping said blade in said slits.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |