Patent US35599A successfully refreshed from Google Patents.
Patent US4053987A successfully refreshed from Google Patents.
US4053987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-purpose drawing instrument
Assignee: Individual
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Filing: 1976-08-17
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Granted: 1977-10-18
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Expires: 1996-08-17
Abstract
Abstract A multi-purpose drawing instrument comprising a guide rod supported horizontally on upright end supports and slidably engaging a roller support on a slide disc such that the disc is slidable along the rod. A carriage is slidingly supported on the guide rod above the slide disc and carries a conical member whose side wall is in pressure contact with the guide rod such that when the conical member is turned the carriage moves along the guide rod. The position of the carriage transversely of the guide rod can be adjusted and the carriage can be engaged with the slide disc when the carriage or slide disc is moved along the guide rod. A horizontally-disposed radial arm is rotatably connected to the center of the slide disc and it has a free end connectable to a ruler. The arm is capable of being clamped to the slide disc at any desired angle relative to the guide rod or carriage.
Inventors
- 👤 Mayya Narayan Ram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:44
CPC Classifications
B; B43; B43L; B43L13/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
A multi-purpose drawing instrument comprising a guide rod supported horizontally on upright end supports; a slide disc including roller support means which slidingly engage said guide rod so that the disc is slidable along said guide rod; a carriage slidingly supported on said guide rod above said slide disc, a conical member, means rotatably supporting said conical member on said slide disc with the side wall of the conical member in pressure contact with the guide rod so that when said conical member is turned the carriage moves along the guide rod, tightening means on said carriage for varying the contact pressure of the conical member on the guide rod; adjustment means for adjusting the position of the carriage transversely of said guide rod and for engaging the carriage with the slide disc when said carriage or slide disc is moved along the guide rod; a horizontally-disposed radial arm one end of which is rotatably connected to the center of the slide disc so that it can be rotated thereat and the free end of which is connectable to a foot ruler, and clamping means for clamping said horizontally disposed radial arm to said slide disc at any desired angle relative to the guide rod or said carriage.
Claim 2
Dependent Claim
208 words
A multi-purpose drawing instrument comprising a guide rod supported horizontally on upright end supports; a slide disc including roller support means which slidingly engage said guide rod so that the disc is slidable along said guide rod; a carriage slidingly supported on said guide rod above said slide disc, a conical member, means rotatably supporting said conical member on said slide disc with the side wall of the conical member in pressure contact with the guide rod so that when said conical member is turned the carriage moves along the guide rod, tightening means on said carriage for varying the contact pressure of the conical member on the guide rod; adjustment means for adjusting the position of the carriage transversely of said guide rod and for engaging the carriage with the slide disc when said carriage or slide disc is moved along the guide rod; a horizontally-disposed radial arm one end of which is rotatably connected to the center of the slide disc so that it can be rotated thereat and the free end of which is connectable to a foot ruler, and clamping means for clamping said horizontally disposed radial arm to said slide disc at any desired angle relative to the guide rod or said carriage.
Claim 3
Dependent Claim
65 words
A drawing instrument as claimed in claim 1, wherein said conical member includes a manually operable toothed wheel at one end thereof and said carriage is provided with an abutment means which engages the toothed wheel so that when said conical member is turned through a distance equal to that between two adjacent teeth the carriage travels along said guide rod by an identical distance.
Claim 4
Dependent Claim
43 words
A drawing instrument as claimed in claim 2, wherein said abutment means is adjustably mounted on the carriage and a release mechanism is provided in the vicinity thereof on the carriage for moving said abutment means to engage or disengage the toothed wheel.
Claim 5
Dependent Claim
33 words
A drawing instrument as claimed in claim 2 comprising a knurled head on said toothed wheel on the side thereof remote from said conical member for facilitating the operation of said conical member.
Claim 6
Dependent Claim
120 words
A drawing instrument as claimed in claim 2 wherein said slide disc is located below said guide rod and wherein said carriage comprises a base plate disposed over said slide disc; a pair of oppositely disposed upright shoulders mounted on said base plate and connected by a pair of roller rods disposed below and substantially transversely of said guide rod, said roller rods being in pressure contact with said guide rod; and an enclosure supported on said pair of upright shoulders for housing said conical member and for supporting said toothed wheel, said enclosure being disposed above said guide rod and having an open base to allow the side wall of said conical member to press against said guide rod.
Claim 7
Dependent Claim
39 words
A drawing instrument as claimed in claim 5, in which said tightening means comprises at least one screw provided at one end of said enclosure, which screw engages in a corresponding aperture provided in said oppositely disposed upright shoulder.
Claim 8
Dependent Claim
57 words
A drawing instrument as claimed in claim 5 wherein said adjustment means comprises an extended slot provided in said base plate and disposed transversely of said guide rod and an upright engagement lug located centrally in said slide disc and projecting within said extended slot so that said carriage can be moved transversely of said guide rod.
Claim 9
Dependent Claim
54 words
A drawing instrument as claimed in claim 5 comprising to a horizontally-disposed index rod adjustably mounted at the periphery of said slide disc with one end of said index rod abutting one of the said upright shoulders to enable the transverse position of said carriage relative to said guide rod to be set precisely.
Claim 10
Dependent Claim
78 words
A drawing instrument as claimed in claim 1 including an additional horizontally-disposed radial arm one end of which is rotatably connected to the center of the slide disc so that it can be rotated thereat and the other free end of which is provided with guide channels for slidably locating a ruler, clamping means being provided for clamping said additional radial arm to said slide disc at any desired angle relative to the guide rod or said carriage.
Claim 11
Dependent Claim
28 words
A drawing instrument as claimed in claim 9, in which the slide ruler locatable in the other end of the additional radial arm is provided with a pin-hole.
Claim 12
Dependent Claim
40 words
A drawing instrument as claimed in claim 1, wherein said slide disc is a protractor, a pointer being mounted between said disc and said carrier so as to indicate the angular position of the carriage relative to the guide rod.
Claim 13
Dependent Claim
28 words
A drawing instrument as claimed in claim 1 wherein one of said upright end supports is provided with at least one of a supporting pin and roller bearings.
References Cited (Backward Citations)
US1469192A
Cited
US1980884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |