Patent US4295279A successfully refreshed from Google Patents.
US4295279A
Expired / Lapsed
US
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Hand tool leveling apparatus
Assignee: Individual
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Filing: 1980-03-10
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Granted: 1981-10-20
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Expires: 2000-03-10
Abstract
Abstract Leveling apparatus for a hand tool such as an electric drill or reciprocating saw is comprised of both a cylindrical bubble level and circular bubble level. The cylindrical bubble level has a longitudinal axis parallel to the working axis of the tool, and thus is utilized for leveling the tool in a horizontal plane. The circular bubble level has an axis passing perpendicularly through its center which is parallel to the working axis of the tool. The circular bubble is utilized for vertically aligning the tool normal to a horizontal datum plane. The bubble of the cylindrical bubble level is viewable from a multiplicity of perspectives. The apparatus may be selectively attached to the drill of different positions on the tool to further improve visibility of the bubble levels. Alternatively, the apparatus is integrated into the housing of the drill.
Inventors
- 👤 Walter F. Sienknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:40
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; G01C9/26; G01C9/28; B; B25; B25H; B25H1/00; B25H1/0021; B25H1/0078; B25H1/0085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
Apparatus for leveling a tool having a working axis comprising: a receptacle of a predetermined configuration attached to the tool; an elongated, sealed, transparent cylindrical tube containing a liquid and a bubble formed by the liquid, said tube being mounted in the receptacle with its horizontal axis parallel to the working axis of the tool to level the tool in a horizontal plane, the receptacle being configured so as to enable viewing the bubble in the cylindrical level from at least the top and both sides thereof. a circular bubble level mounted in the receptacle having an axis passing perpendicular through the center of the circular level, said axis being disposed parallel to the working axis of the tool for leveling the tool in a vertical plane, said circular level containing a transparent liquid and a bubble formed by the liquid, said circular level being biconvex in cross-section and positioned in the receptacle whereby the bubble can be properly positioned in the level to level the tool in either the vertical upward or vertical downward positions and the circular level retains the cylindrical level in the receptacle; and resilient means for removably locking the circular bubble level within the receptacle.
Claim 2
Dependent Claim
200 words
Apparatus for leveling a tool having a working axis comprising: a receptacle of a predetermined configuration attached to the tool; an elongated, sealed, transparent cylindrical tube containing a liquid and a bubble formed by the liquid, said tube being mounted in the receptacle with its horizontal axis parallel to the working axis of the tool to level the tool in a horizontal plane, the receptacle being configured so as to enable viewing the bubble in the cylindrical level from at least the top and both sides thereof. a circular bubble level mounted in the receptacle having an axis passing perpendicular through the center of the circular level, said axis being disposed parallel to the working axis of the tool for leveling the tool in a vertical plane, said circular level containing a transparent liquid and a bubble formed by the liquid, said circular level being biconvex in cross-section and positioned in the receptacle whereby the bubble can be properly positioned in the level to level the tool in either the vertical upward or vertical downward positions and the circular level retains the cylindrical level in the receptacle; and resilient means for removably locking the circular bubble level within the receptacle.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 wherein the resilient means is a circular wire clip.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein the locking means is a rubber grommet.
Claim 5
Dependent Claim
25 words
The apparatus of claim 1 wherein the receptacle is provided with a groove adjacent the position of the circular level for receiving the resilient means.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1 wherein the receptacle is incorporated into a housing for the tool.
Claim 7
Dependent Claim
20 words
The apparatus according to claim 5 wherein the material from which the housing for the tool is fabricated is transparent.
Claim 8
Dependent Claim
15 words
Apparatus according to claim 1 wherein the receptacle means is removably securable to the tool.
Claim 9
Dependent Claim
23 words
Apparatus according to claim 1 wherein the receptacle means defines a plurality of elongated apertures corresponding to the top and both sides thereof.
Claim 10
Dependent Claim
42 words
Apparatus according to claim 1 wherein the receptacle means includes retaining means located at each end of the cylindrical level to allow the cylindrical level to be viewed from an angular position encompassing the level which subtends an angle of approximately 270°.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |