Patent US3680989A successfully refreshed from Google Patents.
Patent US3681849A successfully refreshed from Google Patents.
US3681849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Squareness gauge
Assignee: Venables Machine and Tool Co
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Filing: 1969-12-12
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Granted: 1972-08-08
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Expires: 1989-12-12
Abstract
Abstract A gauge, for measuring the parallelism or perpendicularity of precision machined surfaces, comprising a rectangular base having a pair of vertical surfaces and an adjoining horizontal surface, a graduated spirit level pivotably mounted on the base, and an adjustment member for adjusting the levelness of the spirit level relative to the base to calibrate the gauge to one of the surfaces to be measured and permit direct relative measurement of another surface including an opposed vertical surface. Also provided is a means permitting the gauge to be self aligned to a vertical surface while it is supported by an adjacent horizontal surface.
Inventors
- 👤 Herbert J Venables
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:10
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; G01C9/26; G01C9/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
341 words
A squareness gauge comprising a precision ground rectangular body having a flat lower base surface and a pair of oppositely facing flat side base surfaces adjoining aNd substantially perpendicular to said lower surface, said body having an upper side defining the upper extent of the body, precision spirit level means including a spirit level, a spirit level holder, pivot means permitting angular displacement of the holder and level relative to the body only in a plane perpendicular to said base surfaces, screw adjustment means for precise angular positioning of said holder and level relative to said body, said screw adjustment means including an adjustment nut entirely within said base member whereby accidental movement of the nut is prevented while said gauge is being handled, and a spring on said body biasing said holder against said screw adjustment means, said level including a movable bubble therein, a plurality of reference divisions being arranged along a path taken by said bubble as the level is rotated with said body in said perpendicular plane, said reference divisions each directly indicating with said bubble a predetermined minute angular displacement of the level in the order of five seconds, said base surfaces being precision formed and square to one another within an angular tolerance small in comparison to an angle represented by one of said reference divisions, an alignment notch extending transversely across the full width of the lower base surface and normal to said perpendicular plane, a cylindrical dowel pin adapted to be positioned in said alignment notch whereby said gauge is self aligning to a vertical surface as it is supported with said dowel pin on an adjacent horizontal surface, a hole in the mid-portion of said body to facilitate handling of the gauge, said spirit level means being disposed adjacent the upper side of the body to permit said screw adjustment nut to be manually engaged in a zone vertically defined by the upper portion of said body and to permit said level to be viewed from a direction directly above said body.
Claim 2
Dependent Claim
341 words
A squareness gauge comprising a precision ground rectangular body having a flat lower base surface and a pair of oppositely facing flat side base surfaces adjoining aNd substantially perpendicular to said lower surface, said body having an upper side defining the upper extent of the body, precision spirit level means including a spirit level, a spirit level holder, pivot means permitting angular displacement of the holder and level relative to the body only in a plane perpendicular to said base surfaces, screw adjustment means for precise angular positioning of said holder and level relative to said body, said screw adjustment means including an adjustment nut entirely within said base member whereby accidental movement of the nut is prevented while said gauge is being handled, and a spring on said body biasing said holder against said screw adjustment means, said level including a movable bubble therein, a plurality of reference divisions being arranged along a path taken by said bubble as the level is rotated with said body in said perpendicular plane, said reference divisions each directly indicating with said bubble a predetermined minute angular displacement of the level in the order of five seconds, said base surfaces being precision formed and square to one another within an angular tolerance small in comparison to an angle represented by one of said reference divisions, an alignment notch extending transversely across the full width of the lower base surface and normal to said perpendicular plane, a cylindrical dowel pin adapted to be positioned in said alignment notch whereby said gauge is self aligning to a vertical surface as it is supported with said dowel pin on an adjacent horizontal surface, a hole in the mid-portion of said body to facilitate handling of the gauge, said spirit level means being disposed adjacent the upper side of the body to permit said screw adjustment nut to be manually engaged in a zone vertically defined by the upper portion of said body and to permit said level to be viewed from a direction directly above said body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |