US4232749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible rotary/percussion drill
Assignee: Robert Bosch GmbH
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Filing: 1978-09-11
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Granted: 1980-11-11
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Expires: 1998-09-11
Abstract
Abstract The slider by means of which the drill is changed from rotary drilling to percussion drilling is made of plastic. It is formed as a single unit with end portions to be pushed to select a first position for the rotary drilling and a second position for percussion drilling, stop portions which abut against parts of the housing to stop the movement of the slider in one or the other direction, and elongated latching elements which have cam-like projections for engaging latching recesses in the housing thereby locking the slider in the first or second position. Deformation of a ball riding in an opening of the slider and acting as thrust bearing for the spindle during rotary drilling is prevented by a bearing plate inserted in a recess in the slider in the region of the opening receiving the ball, or a stationary steel plate mounted in a part of the housing along the path travelled by the slider.
Inventors
- 👤 Fritz Rohrbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:00
CPC Classifications
B; B25; B25D; B25D16/00; B25D16/006; B25D2211/00; B25D2211/06; B25D2211/062; B25D2211/064; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18024; Y10T74/18032
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
In a drill selectively operable as rotary drill or percussion drill, mounted in a housing (10) having a recess, said drill having a spindle having a longitudinal axis, the improvement comprising a ball (19) forming a bearing member; a plastic slider (11) mounted in said recess for movement, under external control, from a first position wherein said drill is operative as a rotary drill to a second position wherein said drill is operative as a percussion drill, said plastic slider having an opening (18) aligned with said spindle along said longitudinal axis thereof when in said first position, the ball (19) being located in said opening for constituting a thrust bearing for said spindle when said drill is operative as rotary drill; a bearing plate (21) positioned in said further recess, said bearing plate and said ball together constituting said thrust bearing for said spindle when said drill is operative as rotary drill; and at least one latching element (14) formed on the slider for selectively latching said slider in said first or said second position, whereby the plastic slider and the latching elmeent will form a single unitary plastic member.
Claim 2
Dependent Claim
191 words
In a drill selectively operable as rotary drill or percussion drill, mounted in a housing (10) having a recess, said drill having a spindle having a longitudinal axis, the improvement comprising a ball (19) forming a bearing member; a plastic slider (11) mounted in said recess for movement, under external control, from a first position wherein said drill is operative as a rotary drill to a second position wherein said drill is operative as a percussion drill, said plastic slider having an opening (18) aligned with said spindle along said longitudinal axis thereof when in said first position, the ball (19) being located in said opening for constituting a thrust bearing for said spindle when said drill is operative as rotary drill; a bearing plate (21) positioned in said further recess, said bearing plate and said ball together constituting said thrust bearing for said spindle when said drill is operative as rotary drill; and at least one latching element (14) formed on the slider for selectively latching said slider in said first or said second position, whereby the plastic slider and the latching elmeent will form a single unitary plastic member.
Claim 3
Dependent Claim
78 words
A drill as set forth in claim 1, wherein said plastic slider (11) is formed with a first and second elongated latching element (14) each restrained at one end and having, respectively, a first and second free end carrying a first and second camlike projection (15); and wherein said housing further has a first and second latching recess (16) for receiving said first and second cam-like projection when said slider is in said first or second position respectively.
Claim 4
Dependent Claim
45 words
A drill as set forth in claim 1, wherein said plastic slider has a first and second end portion (13) for receiving an externally applied push force for moving said slider from said first to said second and from said second to said first position.
Claim 5
Dependent Claim
61 words
A drill as set forth in claim 3, wherein said plastic slider is mounted opposite a predetermined part of said housing for movement relative thereto; and wherein said improvement further comprises a stationary steel plate (24) mounted in said predetermined part of said housing and extending from said first to said second position in the direction of movement of said slider.
Claim 6
Dependent Claim
51 words
A drill as set forth in claim 1, wherein said plastic slider is positioned relative to said housing in such a manner that said ball and said bearing plate are retained in said opening and said further recess by said housing when said plastic selection member is in said second position.
Claim 7
Dependent Claim
18 words
A drill as set forth in claim 1, wherein said bearing plate is made of case hardened steel.
Claim 8
Dependent Claim
28 words
A drill as set forth in claim 1, wherein said slider (11) is slidable in the housing (10) transversely with respect to the longitudinal axis of the spindle.
References Cited (Backward Citations)
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US3799275A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |