US3698140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit sharpening mechanism for use in conjunction with hand drills
Assignee: Individual
•
Filing: 1970-12-30
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Granted: 1972-10-17
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Expires: 1990-12-30
Abstract
Abstract A compact and highly portable mechanism for sharpening standard drill bits with the grindstone, all tools and associated hardware built in to the device and motive power supplied by attachment of a conventional hand drill with provision for adjustment of the angle of interaction between the rotatable grind stone and the face of the drill bit to preserve the original cutting angle of each of the drill bit biting surfaces. The device is provided with chuck holders for drill bits of varying sizes and guide structures hold the drill bit in proper alignment with respect to the grindstone during the sharpening operation.
Inventors
- 👤 Rufus F Steadman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:37
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/26; B24B3/265
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
188 words
A compact, portable, hand-held drill bit sharpening device comprising: A. a specially shaped trapezoidal guide block having 1. a plurality of spaced apart chuck receiving pilot guideway channels drilled through one plane of said guide block, and 2. a plurality of stop pins mounted in the upper surface of said guide block; B. a plurality of cylindrical, sized drill bit holding chucks adapted to rotatably fit into said guideway channels in the guide block, 1. provided with a central drill bit receiving tubular passageway running through the length of said drill holding chuck, and 2. provided with stop recesses in each drill holding chuck adapted to engage with the stop pins provided in said guide block; C. cylindrical rotary sharpening stone pivotally mounted in an angular position with respect to said guide block such that said stone will make contact with and sharpen a drill bit held in one of said drill holding chucks mounted in one of said pilot guideway channels; and D. an axle supporting said angularly disposed rotary grind stone and provided with a shank connection to a hand drill to provide rotary motive power.
Claim 2
Dependent Claim
188 words
A compact, portable, hand-held drill bit sharpening device comprising: A. a specially shaped trapezoidal guide block having 1. a plurality of spaced apart chuck receiving pilot guideway channels drilled through one plane of said guide block, and 2. a plurality of stop pins mounted in the upper surface of said guide block; B. a plurality of cylindrical, sized drill bit holding chucks adapted to rotatably fit into said guideway channels in the guide block, 1. provided with a central drill bit receiving tubular passageway running through the length of said drill holding chuck, and 2. provided with stop recesses in each drill holding chuck adapted to engage with the stop pins provided in said guide block; C. cylindrical rotary sharpening stone pivotally mounted in an angular position with respect to said guide block such that said stone will make contact with and sharpen a drill bit held in one of said drill holding chucks mounted in one of said pilot guideway channels; and D. an axle supporting said angularly disposed rotary grind stone and provided with a shank connection to a hand drill to provide rotary motive power.
Claim 3
Dependent Claim
36 words
a plurality of stop pins mounted in the upper surface of said guide block; B. a plurality of cylindrical, sized drill bit holding chucks adapted to rotatably fit into said guideway channels in the guide block,
Claim 4
Dependent Claim
36 words
a plurality of stop pins mounted in the upper surface of said guide block; B. a plurality of cylindrical, sized drill bit holding chucks adapted to rotatably fit into said guideway channels in the guide block,
Claim 5
Dependent Claim
93 words
provided with stop recesses in each drill holding chuck adapted to engage with the stop pins provided in said guide block; C. cylindrical rotary sharpening stone pivotally mounted in an angular position with respect to said guide block such that said stone will make contact with and sharpen a drill bit held in one of said drill holding chucks mounted in one of said pilot guideway channels; and D. an axle supporting said angularly disposed rotary grind stone and provided with a shank connection to a hand drill to provide rotary motive power.
Claim 6
Dependent Claim
93 words
provided with stop recesses in each drill holding chuck adapted to engage with the stop pins provided in said guide block; C. cylindrical rotary sharpening stone pivotally mounted in an angular position with respect to said guide block such that said stone will make contact with and sharpen a drill bit held in one of said drill holding chucks mounted in one of said pilot guideway channels; and D. an axle supporting said angularly disposed rotary grind stone and provided with a shank connection to a hand drill to provide rotary motive power.
Claim 7
Dependent Claim
47 words
The compact, portable drill bit sharpening apparatus described in claim 1 provided with a plurality of at least three small individual spaced apart grinding stones on a common axle and spacially arranged to be in alignment with the drill holding chuck guideways in the main guide block.
Claim 8
Dependent Claim
19 words
with each of said flanges being disposed at an angle from the main body of the end plate, and
Claim 9
Dependent Claim
19 words
with each of said flanges being disposed at an angle from the main body of the end plate, and
Claim 10
Dependent Claim
21 words
drill bit channels extending from the bottom of each pilot guideway through to the opposite face of said guide block, and
Claim 11
Dependent Claim
21 words
drill bit channels extending from the bottom of each pilot guideway through to the opposite face of said guide block, and
Claim 12
Dependent Claim
12 words
means for securely locking said drill bit in position within said chuck,
Claim 13
Dependent Claim
12 words
means for securely locking said drill bit in position within said chuck,
Claim 14
Dependent Claim
19 words
provided with cylindrically shaped shanks adapted to rotatably fit into one of the pilot guideways provided in said guideblock,
Claim 15
Dependent Claim
19 words
provided with cylindrically shaped shanks adapted to rotatably fit into one of the pilot guideways provided in said guideblock,
Claim 16
Dependent Claim
37 words
a plurality of stop pins mounted in the upper surface of said guide block at spaced apart positions near the periphery of the guideway openings; B. a plurality of sized and cylindrically shaped drill holding chucks being
Claim 17
Dependent Claim
37 words
a plurality of stop pins mounted in the upper surface of said guide block at spaced apart positions near the periphery of the guideway openings; B. a plurality of sized and cylindrically shaped drill holding chucks being
Claim 18
Dependent Claim
122 words
each of said end plates being provided with an axle receiving bearing opening; D. an axle shaft extending through each of the axle receiving bearing openings in the flanges of said left and right end plates with one end of said shaft being extended to form a coupling drive shaft by which a hand drill may be connected to said axle-coupling drive shaft to deliver rotary drive motion to said axle; and E. a cylindrically shaped grindstone sleeve mounted on said axle in such manner and in such angular position that said grindstone intercepts drill bits held in chucks mounted in the guide block at a proper angle to grind new sharpened cutting surfaces on said drill bits at a proper taper.
Claim 19
Dependent Claim
122 words
each of said end plates being provided with an axle receiving bearing opening; D. an axle shaft extending through each of the axle receiving bearing openings in the flanges of said left and right end plates with one end of said shaft being extended to form a coupling drive shaft by which a hand drill may be connected to said axle-coupling drive shaft to deliver rotary drive motion to said axle; and E. a cylindrically shaped grindstone sleeve mounted on said axle in such manner and in such angular position that said grindstone intercepts drill bits held in chucks mounted in the guide block at a proper angle to grind new sharpened cutting surfaces on said drill bits at a proper taper.
Claim 20
Dependent Claim
32 words
The compact, portable drill bit sharpening apparatus described in claim 1 in which the drill holding chucks are provided with adjustable means for receiving and securely holding drill bits of various sizes.
Claim 21
Dependent Claim
32 words
The compact, portable drill bit sharpening apparatus described in claim 1 provided with adjustable means of varying the angle of interaction between the grind stone and the drill bit to be sharpened.
Claim 22
Dependent Claim
65 words
provided with a pair of spaced apart stop-recesses cut into opposite sides of said chucks in such manner as to engage at least one of said stop pins and limit the arc through which said drill holding chuck can rotate; C. left and right end plates of unequal length attached to the left and right ends of said guide block with said end plates having
Claim 23
Dependent Claim
65 words
provided with a pair of spaced apart stop-recesses cut into opposite sides of said chucks in such manner as to engage at least one of said stop pins and limit the arc through which said drill holding chuck can rotate; C. left and right end plates of unequal length attached to the left and right ends of said guide block with said end plates having
Claim 24
Dependent Claim
112 words
The compact, portable drill bit sharpening apparatus described in claim 1 in which A. a cam bearing ramp structure is provided through a fractional arc on the upper surface of said guide block adjacent to each of the openings inTo the pilot guideways in said guide block; and B. a bearing shoulder flange structure is provided on the exterior of each of said drill holding chucks and adapted to engage with said cam bearing ramp structure through a controlled arc of rotation by said drill holding chuck to provide means of grinding away a proportionate part of the heel of the drill bit as the drill bit biting surfaces are being sharpened.
Claim 25
Dependent Claim
15 words
A compact, portable drill bit sharpening device comprising: A. a trapezoidally shaped guide block having
Claim 26
Dependent Claim
15 words
A compact, portable drill bit sharpening device comprising: A. a trapezoidally shaped guide block having
Claim 27
Dependent Claim
47 words
The compact, portable drill bit sharpening apparatus described in claim 6 provided with a plurality of at least three small individual spaced apart grinding stones on a common axle and spacially arranged to be in alignment with the drill holding chuck guideways in the main guide block.
Claim 28
Dependent Claim
32 words
The compact, portable drill bit sharpening apparatus described in claim 6 provided with adjustable means of varying the angle of interaction between the grind stone and the drill bit to be sharpened.
Claim 29
Dependent Claim
73 words
The compact, portable drill bit sharpening apparatus described in claim 8 in which the means of varying the angle of interaction between the grindstone and the drill bit to be sharpened is by means of a swivel axle bearing in one of the end plates and by provision of means for adjusting the vertical position of the opposite end plate in such manner as to change the angle of tilt of said grindstone.
Claim 30
Dependent Claim
89 words
The compact, portable drill bit sharpening apparatus described in claim 8 in which the means of varying the angle of interaction between the grind stone and the drill bit to be sharpened is accomplished at one end by means of a swivel axle bearing in one of the end plates and the angle of tilt of said grind stone is made adjustable by providing a slot shaped bearing opening in the opposite end plate with releasable means of repositioning the grind stone axle within said slot shaped bearing opening.
Claim 31
Dependent Claim
54 words
The compact, portable drill bit sharpening apparatus described in claim 8 in which the angle of interaction between the grind stone and the drill bit to be sharpened is accomplished by providing means of pivotally mounting said left and right end plates on pivot studs provided in the opposite ends of the guide block.
Claim 32
Dependent Claim
118 words
The compact, portable drill bit sharpening apparatus described in claim 6 in which A. a cam bearing ramp structure is provided through a fractional arc on the upper surface of said guide block adjacent to each of the openings into the pilot guideways in said guide block; and B. a bearing shoulder flange structure is provided on the exterior of each of said drill holding chucks and adapted to engage with said cam bearing ramp structure through a controlled arc of rotation by said drill holding chuck to provide means of grinding away a proportionate part of the heel of the drill bit at a proper angle of taper as the drill bit biting surfaces are being sharpened.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |