US4993894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill
Assignee: Fischerwerke Artur Fischer GmbH and Co KG
•
Filing: 1990-02-27
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Granted: 1991-02-19
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Expires: 2010-02-27
Abstract
Abstract A drill for drilling holes in masonry and comprising a depth stop mounted on the drill shank and formed as a resilient anti-vibration element.
Inventors
- 👤 Artur Fischer
- 👤 Willi Haug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:13
CPC Classifications
E; E21; E21B; E21B10/00; B; B23; B23B; B23B49/00; B23B49/003; B23B49/005; B23B51/00; B23B51/0018; B23B51/0027; Y; Y10; Y10T; Y10T408/00; Y10T408/18; Y10T408/55; Y10T408/566; Y10T408/76; Y10T408/89; Y10T408/892; Y10T408/8925; Y10T408/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A drill for producing drilled holes in masonry, comprising a drill shank; and a depth stop mounted on said shank and comprising a resilient anti-vibration element; a drill bit tip having lateral cutting edges projecting laterally beyond said shank; bulge means formed on said shank between said resilient anti-vibration element and said drill tip; a collar formed on said shank above said resilient anti-vibration element; and a bearing washer arranged between said collar and said resilient, anti-vibration element, said resilient anti-vibration element being ring-shaped and abutting said bearing washer.
Claim 2
Dependent Claim
89 words
A drill for producing drilled holes in masonry, comprising a drill shank; and a depth stop mounted on said shank and comprising a resilient anti-vibration element; a drill bit tip having lateral cutting edges projecting laterally beyond said shank; bulge means formed on said shank between said resilient anti-vibration element and said drill tip; a collar formed on said shank above said resilient anti-vibration element; and a bearing washer arranged between said collar and said resilient, anti-vibration element, said resilient anti-vibration element being ring-shaped and abutting said bearing washer.
Claim 3
Dependent Claim
22 words
A drill as set forth in claim 1, further comprising a casing arranged over said collar and engaging said resilient anti-vibration element.
Claim 4
Dependent Claim
18 words
A drill as set forth in claim 2, wherein said casing is mounted over said resilient anti-vibration element.
Claim 5
Dependent Claim
51 words
A drill as set forth in claim 2, wherein said resilient anti-vibration element has a side wall, said casing having end means laterally engaging said side all in such a manner that said resilient anti-vibration element has a lower portion projecting in a direction toward said drill tip beyond said casing.
Claim 6
Dependent Claim
38 words
A drill as set forth in claim 3, wherein said resilient anti-vibration element being formed as a cup having a side wall engaging over said collar, and a base having a through-opening through which said drill shank extends.
Claim 7
Dependent Claim
18 words
A drill as set forth in claim 5, wherein said cup has a contour of a truncated cone.
Claim 8
Dependent Claim
19 words
A drill as set forth in claim 5, wherein said side wall and said collar have conical peripheral surfaces.
Claim 9
Dependent Claim
20 words
A drill as set forth in claim 7, further comprising a bearing washer located between said base and said collar.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |