Patent US3947969A successfully refreshed from Google Patents.
US3947969A
Expired / Lapsed
US
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Drawing instruments
Assignee: Individual
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Filing: 1973-12-14
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Granted: 1976-04-06
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Expires: 1993-12-14
Abstract
Abstract A drawing instrument having a template which can be moved linearly or rotated. The template is circular in configuration and is held at its periphery by bearings mounted on a support under the template so that the template can be rotated without lateral movements.
Inventors
- 👤 Carlos Gonzalez Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:07
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/20; B43L13/201; B43L13/205
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A drawing instrument comprising a planar support having a circular opening therein, a plurality of rotatable bearing means, means detachably securing said bearing means to said support in circumferentially spaced relation about said circular opening, a drafting template peripherally supported by said planar support, said template having a dimension slightly greater than said support opening for reception thereover and within said bearing means, circular means surrounding and engaging the periphery of said template, said circular means further peripherally engaging said rotatable bearing means enabling the rotation of said template within said bearings for desired positioning thereof, and means provided on said circular means to prevent relative rotation of said template with respect to said circular means.
Claim 2
Dependent Claim
116 words
A drawing instrument comprising a planar support having a circular opening therein, a plurality of rotatable bearing means, means detachably securing said bearing means to said support in circumferentially spaced relation about said circular opening, a drafting template peripherally supported by said planar support, said template having a dimension slightly greater than said support opening for reception thereover and within said bearing means, circular means surrounding and engaging the periphery of said template, said circular means further peripherally engaging said rotatable bearing means enabling the rotation of said template within said bearings for desired positioning thereof, and means provided on said circular means to prevent relative rotation of said template with respect to said circular means.
Claim 3
Dependent Claim
51 words
The drawing instrument of claim 1 wherein said circular means comprises a ring within which said template is received, the outer periphery of said ring being disposed in rotatable engagement with said rotatable bearing means, and interengaging notch and offset means on said template and ring to prevent relative rotation therebetween.
Claim 4
Dependent Claim
45 words
The drawing instrument of claim 2 including a plurality of holes disposed respectively in said template and said support capable of being rotated into vertical alignment, and a pin receivable in said aligned holes to lock said template against rotation with respect to said support.
Claim 5
Dependent Claim
54 words
The drawing instrument of claim 1 wherein said template includes a downwardly extending hub substantially centrally thereof extending through said support opening and disposed in said support opening thereby to support the central portion of said template while the periphery of the template is supported around the outside of said opening in said support.
Claim 6
Dependent Claim
45 words
The drawing instrument of claim 1 wherein said rotatable bearing means includes a downwardly and radially inwardly tapered peripheral surface cooperating with an upwardly and inwardly tapered peripheral surface on said template surrounding means thereby to releasably retain the template surrounding means on said support.
References Cited (Backward Citations)
US3393457A
Cited
US3568327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |