US3838540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sharpening drills and other cutting tools
Assignee: Individual
•
Filing: 1972-06-05
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Granted: 1974-10-01
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Expires: 1992-06-05
Abstract
Abstract Apparatus for accurately and quickly grinding multiple cutting edges of a cutting tool such as a drill in a single continuous operation. The apparatus comprises a rotary grinding wheel having a planar grinding surface, means for holding the drill relative to the grinding surface, and means having an axis for rotating the drill slowly about the longitudinal axis of the rotating means. Cam means are provided to tilt the drill holding means as the drill rotates to provide the relieved portions back of the cutting edges of the drill. Additional cam means are provided to move the drill holding means away from the grinding wheel as the drill rotates to avoid grinding off the point or apex of the sharpened tool. Means are further provided to advance the tool into the grinding surface to achieve the desired amount of sharpening. The apparatus also incorporates a novel and improved holding means or chuck for holding the cutting tool. Further, the apparatus is constructed and arranged so that the grinding wheel may be dressed, and the resulting planar grinding surface will be automatically positioned, after dressing, in the desired grinding plane. Also after such dressing the grinder cover or guard will also automatically be in the proper position.
Inventors
- 👤 J Steinmetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:01
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/48; B24; B24B; B24B3/00; B24B3/24; B24B3/26; B24B3/28; B24B3/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
183 words
Apparatus for grinding a tool, comprising: means for holding a rotarY cutting tool which has an axis of rotation and at least one relieved cutting edge, the holding means having a first axis about which said holding means rotates incident to grinding of the cutting edge of the tool, said first axis intersecting the tool axis adjacent said cutting edge but being otherwise out of alignment with the tool axis during at least part of said rotation of said holding means, the tool being held with the cutting edge in spatial relation to a grinding surface that is in a fixed location, means for advancing said holding means to advance the cutting edge of the tool toward the grinding surface, and means for rotating said holding means about said first axis and for additionally, periodically moving said holding means about a second axis which intersects said first axis adjacent to said cutting edge, said periodic movement being in timed relation to said rotation and in such a manner so as to grind in a continuous operation the relieved cutting edge on the tool.
Claim 2
Dependent Claim
183 words
Apparatus for grinding a tool, comprising: means for holding a rotarY cutting tool which has an axis of rotation and at least one relieved cutting edge, the holding means having a first axis about which said holding means rotates incident to grinding of the cutting edge of the tool, said first axis intersecting the tool axis adjacent said cutting edge but being otherwise out of alignment with the tool axis during at least part of said rotation of said holding means, the tool being held with the cutting edge in spatial relation to a grinding surface that is in a fixed location, means for advancing said holding means to advance the cutting edge of the tool toward the grinding surface, and means for rotating said holding means about said first axis and for additionally, periodically moving said holding means about a second axis which intersects said first axis adjacent to said cutting edge, said periodic movement being in timed relation to said rotation and in such a manner so as to grind in a continuous operation the relieved cutting edge on the tool.
Claim 3
Dependent Claim
47 words
The apparatus of claim 1 wherein: said tool cutting edge has an apex, and said means for effecting additional periodic movement includes means for periodically tilting said holding means about said second axis, said second axis intersecting said first axis at said apex of the cutting edge.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 further comprising means for holding a grinding wheel to provide a grinding surface.
Claim 5
Dependent Claim
28 words
The apparatus of claim 3 wherein said grinding wheel holding means is adjustably movable to vary the angle between said grinding surface and the tool folding means axis.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1 wherein: said means for effecting periodic movement includes means for periodically retracting said tool holding means for the grinding surface.
Claim 7
Dependent Claim
22 words
The apparatus of claim 5 wherein: said means for effecting periodic movement also includes means for periodically tilting said tool holding means.
Claim 8
Dependent Claim
45 words
The apparatus of claim 3, further comprising dressing means having a dressing point disposed in a reference grinding plane, and means for effecting movement of said grinding wheel holding means relative to said dressing means to provide a dressed grinding surface in said reference plane.
Claim 9
Dependent Claim
40 words
The apparatus of claim 7 further comprising means defining a cover for the grinding surface, said cover means being connected to said dressing means so that the spacing of said cover means is maintained after dressing of the grinding wheel.
Claim 10
Dependent Claim
168 words
Apparatus for sharpening a cutting tool comprising: means for holding a grinding wheel having a grinding surface, means for holding a rotary cutting tool which has an axis and at least one relieved cutting edge, the tool being held in spatial relation to the grinding surface, means for effective relative advancing movement between said wheel holding means and said tool holding means to advance the tool toward the cutting surface, and means for effecting relative grinding movement between said wheel holding means and said tool holding means so as to effect grinding of the tool cutting edge and the relief therefor, said means for effecting relative grinding movement including (a) means for effecting relative rotation about an axis intersecting the grinding surface, said rotation axis intersecting the tool axis adjacent the tool cutting edge but being otherwise out of alignment with the tool axis during at least part of said relative rotation, and (b) means for effecting additional periodic relative movement in timed relation to the said rotation.
Claim 11
Dependent Claim
168 words
Apparatus for sharpening a cutting tool comprising: means for holding a grinding wheel having a grinding surface, means for holding a rotary cutting tool which has an axis and at least one relieved cutting edge, the tool being held in spatial relation to the grinding surface, means for effective relative advancing movement between said wheel holding means and said tool holding means to advance the tool toward the cutting surface, and means for effecting relative grinding movement between said wheel holding means and said tool holding means so as to effect grinding of the tool cutting edge and the relief therefor, said means for effecting relative grinding movement including (a) means for effecting relative rotation about an axis intersecting the grinding surface, said rotation axis intersecting the tool axis adjacent the tool cutting edge but being otherwise out of alignment with the tool axis during at least part of said relative rotation, and (b) means for effecting additional periodic relative movement in timed relation to the said rotation.
Claim 12
Dependent Claim
124 words
The apparatus of claim 9 wherein said tool holding means comprises a chuck assembly comprising: a. a frame disposed around a center axis, b. at least three jaws each having an outer portion and an inner gripping portion, the jaws being pivotally mounted at their outer portions on said frame, said jaws being spaced around said center axis and extending generally inwardly toward said axis so that said inner gripping portions will converge toWard and meet at said axis when said jaws are pivoted, and c. means for controlling pivotal movement of said jaws toward and away from said axis so that each of said gripping portions remains essentially the same distance from said axis as the other gripping portions over a gripping range.
Claim 13
Dependent Claim
17 words
The apparatus of claim 10 wherein said jaws are pivotally mounted at equal intervals around said axis.
Claim 14
Dependent Claim
47 words
The apparatus of claim 11 wherein said control means comprises a rotatable ring means having its center at said axis, and connector means connecting each of said jaws to said ring means, whereby rotation of said ring means effects equal pivotal movement of each of said jaws.
Claim 15
Dependent Claim
26 words
The apparatus of claim 12 wherein said connector means for each jaw is a rigid link member pivotally connected to the jaw and to the ring.
Claim 16
Dependent Claim
17 words
The apparatus of claim 10 wherein said jaws have substantial length in the direction of said axis.
Claim 17
Dependent Claim
205 words
Apparatus for sharpening a cutting tool having an apex, a longitudinal axis, and at least one relieved cutting edge; the apparatus comprising: a. a frame; b. means on the frame for holding a grinding wheel having a grinding surface; c. rotating means on the frame, the rotating means having and being rotatable about an axis comprising a first grinding motion axis; d. holding means for holding a rotary cutting tool with its apex in said first grinding motion axis and at the grinding surface, the tool holding means being pivotably mounted upon the rotating means for pivotal movement about a second grinding motion axis, said second grinding motion axis lying in a plane transverse to said first grinding motion axis and passing through the intersection of the apex of the tool and the grinding surface; e. first means coupled to the rotating means for effecting rotation of the rotating means about said first grinding motion axis, said relation effecting rotation of the second grinding motion axis about said first grinding motion axis; and f. second means for effecting pivoting of the tool holding means about the second grinding motion axis in timed relation to rotation of the rotating means about said first grinding motion axis.
Claim 18
Dependent Claim
205 words
Apparatus for sharpening a cutting tool having an apex, a longitudinal axis, and at least one relieved cutting edge; the apparatus comprising: a. a frame; b. means on the frame for holding a grinding wheel having a grinding surface; c. rotating means on the frame, the rotating means having and being rotatable about an axis comprising a first grinding motion axis; d. holding means for holding a rotary cutting tool with its apex in said first grinding motion axis and at the grinding surface, the tool holding means being pivotably mounted upon the rotating means for pivotal movement about a second grinding motion axis, said second grinding motion axis lying in a plane transverse to said first grinding motion axis and passing through the intersection of the apex of the tool and the grinding surface; e. first means coupled to the rotating means for effecting rotation of the rotating means about said first grinding motion axis, said relation effecting rotation of the second grinding motion axis about said first grinding motion axis; and f. second means for effecting pivoting of the tool holding means about the second grinding motion axis in timed relation to rotation of the rotating means about said first grinding motion axis.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |