Patent US3837121A successfully refreshed from Google Patents.
US3837121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling machine
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1973-08-09
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Granted: 1974-09-24
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Expires: 1993-08-09
Abstract
Abstract Disclosed is a machine for drilling into hard materials. The machine comprises a conventional miniature drill press, improved by the addition of a camming device to cause the drill to reciprocate while rotating, and a shock absorber interposed between the drill motor and bit to absorb a portion of the impact of the bit tip against the work piece. In certain embodiments means are provided to introduce quantities of an abrasive suspension to the bit tip.
Inventors
- 👤 K Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
B; B23; B23B; B23B37/00; B24; B24B; B24B1/00; B24B1/04; Y; Y10; Y10S; Y10S408/00; Y10S408/70; Y10T; Y10T408/00; Y10T408/23
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
215 words
The apparatus for drilling into a workpiece, comprising: an elongated bit; mechanical means to impart rotational motion to said bit, comprising: a motor; a bit holder having an axis, a first end and a second end, said first end of said bit holder being operably connected to said motor in such manner that upon rotation of said motor, said bit holder is caused to rotate about said axis, said bit being substantially rigidly attached to said second end in such manner that rotation of said motor causes rotation of said bit; mechanical means to impart reciprocating longitudinal motion to said bit, said motion intermittently bringing said bit into contact with the workpiece; and means, operably associated with said rotational motion imparting means, for absorbing at least a portion of the impact created by contact of said bit with the workpiece, comprising: a first portion of said bit holder, said first portion possessing a substantially axial cavity having an opening at one end thereof; a second portion slideably mounted within the cavity of said first portion and extending out of said first portion through the opening therein; means to substantially preVent rotational motion of said second portion within said first portion; and means within said first portion to resist axial sliding of said second portion thereinto.
Claim 2
Independent Claim
215 words
The apparatus for drilling into a workpiece, comprising: an elongated bit; mechanical means to impart rotational motion to said bit, comprising: a motor; a bit holder having an axis, a first end and a second end, said first end of said bit holder being operably connected to said motor in such manner that upon rotation of said motor, said bit holder is caused to rotate about said axis, said bit being substantially rigidly attached to said second end in such manner that rotation of said motor causes rotation of said bit; mechanical means to impart reciprocating longitudinal motion to said bit, said motion intermittently bringing said bit into contact with the workpiece; and means, operably associated with said rotational motion imparting means, for absorbing at least a portion of the impact created by contact of said bit with the workpiece, comprising: a first portion of said bit holder, said first portion possessing a substantially axial cavity having an opening at one end thereof; a second portion slideably mounted within the cavity of said first portion and extending out of said first portion through the opening therein; means to substantially preVent rotational motion of said second portion within said first portion; and means within said first portion to resist axial sliding of said second portion thereinto.
Claim 3
Dependent Claim
14 words
The apparatus as recited in claim 1, wherein said resistance means comprises a spring;
Claim 4
Dependent Claim
12 words
The apparatus as recited in claim 2, wherein said spring is helical.
Claim 5
Dependent Claim
97 words
The apparatus as recited in claim 1, wherein said reciprocating motion imparting means comprises: driving means; a flange operably connected to said driving means in such manner that said motor imparts rotational motion thereto; a substantially longitudinal member, a first region of said longitudinal member being operably connected to said flange in such manner that upon rotation thereof, a second region of said longitudinal member, longitudinally displaced from said first region, is caused to reciprocate, said second region being operably connected to said bit holder in such manner as to cause said bit holder to responsively reciprocate.
Claim 6
Dependent Claim
24 words
The apparatus as recited in claim 1, further including bit guide means, said bit guide means adapted to restrict transverse motion of said bit.
Claim 7
Dependent Claim
52 words
The apparatus as recited in claim 5, when said bit guide means comprises a plate having a hole, said plate substantially secure to said motor, in such manner as to restrict motion of said plate in a direction transverse to said bit, said bit being inserted through the hole in said plate.
Claim 8
Dependent Claim
23 words
The apparatus as recited in claim 1, further including means to introduce, to the tip portion of said bit, a granular abrasive substance.
Claim 9
Dependent Claim
44 words
The apparatus as recited in claim 7, wherein said abrasive is in a pulverized form and in liquid suspension, and said introduction means comprises a reservior for said suspension and means to transport quantities of said suspension from said reservoir to said tip portion.
Claim 10
Dependent Claim
24 words
The apparatus as recited in claim 8, wherein said reservoir is gravitationally higher than said tip portion and said transportation means comprises a tube.
Claim 11
Dependent Claim
13 words
The apparatus as recited in claim 7, wherein said abrasive comprises diamond dust.
Claim 12
Dependent Claim
17 words
The apparatus, as recited in claim 7, wherein said tip portion comprises a relatively soft metallic substance.
Claim 13
Dependent Claim
17 words
The apparatus, as recited in claim 11, wherein said substance comprises an alloy of copper and beryllium.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |