US3685916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bolt hole drilling jig for elevator installation
Assignee: Individual
•
Filing: 1971-03-12
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Granted: 1972-08-22
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Expires: 1991-03-12
Abstract
Abstract This precision drilling jig has a base with a flat bottom surface adapted to rest upon the flat top surface of an elevator car sill and a locating rib fitting into a groove in the sill. An angle arm is secured to the forward portion of the base and extends downward therefrom beneath the car platform carrying the sill and has a clamping screw movable upward into clamping engagement with the car platform. Pivotally mounted on the forward portion of the base to swing upward from a horizontal position coextensive therewith is a drilling arm containing a plurality of precisely located holes in which are mounted drilling bushings for precisely guiding the drill which drills the bolt holes in the elevator shaft entrance sill footing of the building floor for the subsequent bolting thereto of two laterally-spaced unfolded Z-brackets to which in turn is bolted the stationary elevator shaft entrance door sill.
Inventors
- 👤 Charles M Loomis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:42
CPC Classifications
B; B23; B23B; B23B47/00; B23B47/28; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/563
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base and extending outwardly away from said base and clamping device for swinging upward relatively thereto and having drill guide holes extending through the outer end portion of said arm remote from said base and clamping device.
Claim 2
Dependent Claim
112 words
A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base and extending outwardly away from said base and clamping device for swinging upward relatively thereto and having drill guide holes extending through the outer end portion of said arm remote from said base and clamping device.
Claim 3
Dependent Claim
113 words
A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base for swinging upward relatively thereto and having drill guide holes extending therethrough, said base on the under side thereof having downwardly-projecting jig-locating means adapted to interfit with a cooperating locating recess on the elevator car platform structure.
Claim 4
Dependent Claim
113 words
A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base for swinging upward relatively thereto and having drill guide holes extending therethrough, said base on the under side thereof having downwardly-projecting jig-locating means adapted to interfit with a cooperating locating recess on the elevator car platform structure.
Claim 5
Dependent Claim
33 words
A bolt hole drilling jig, according to claim 2, wherein said jig-locating means includes an elongated member, and wherein the locating recess is an elongated groove adapted to snugly receive said elongated member.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |