US3744808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draw chuck with individually adjustable clamping jaws
Assignee: Idaho Research Foundation Inc
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Filing: 1972-02-14
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Granted: 1973-07-10
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Expires: 1992-02-14
Abstract
Abstract A chuck having bell crank driven cylindrical master jaws paired with associated workpiece clamping jaws. Each clamping jaw is securely and safely locked to its master jaw and released therefrom by a clamping plate which is disposed in a radial, Tshaped slot in the clamping jaw. The plate has legs extending rearwardly into a radial passage in the master jaw engaging therein a radially disposed camming pin which is actuable to draw the clamping jaw into locked or released position with the master jaw. The clamping jaw, in its released position, is movable radially with respect to the master jaw, for adjustment or removal by sliding movement on the clamping plate. A locking pin is provided to lock each master jaw against radial movement to machine or bore the clamping jaws. A cylindrical sleeve seals the chuck against contaminating particles.
Inventors
- 👤 C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:40
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/001; B23B31/02; B23B31/10; B23B31/12; B23B31/16; B23B31/16195; B23B31/162; B23B31/16208; Y; Y10; Y10T; Y10T279/00; Y10T279/19; Y10T279/1961; Y10T279/1986; Y10T279/1993; Y10T279/34; Y10T279/3462; Y10T279/3468; Y10T279/3475; Y10T279/3493
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
168 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a plurality of radially extending passages in said body portion, said passages opening toward the front and being angularly spaced around the body portion; a master jaw in each of said passages and presenting a forwardfacing surface through the opening; a clamping jaw for each master jaw and having a rear surface adapted to be clamped against the forward-facing surface on said master jaw; a clamping plate for each clamping jaw, said clamping plates having pairs of legs extending rearwardly therefrom into openings in said master jaws; a radially extending passage in each master jaw into which said legs extend, said legs having openings therethrough aligned with said last-mentioned passages; and a cam pin extending through each of said last-mentioned passages and through the pair of legs extending thereinto for moving the legs and clamping plates toward and away from the master jaws to clamp and release the clamping jaws on the master jaws.
Claim 2
Dependent Claim
168 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a plurality of radially extending passages in said body portion, said passages opening toward the front and being angularly spaced around the body portion; a master jaw in each of said passages and presenting a forwardfacing surface through the opening; a clamping jaw for each master jaw and having a rear surface adapted to be clamped against the forward-facing surface on said master jaw; a clamping plate for each clamping jaw, said clamping plates having pairs of legs extending rearwardly therefrom into openings in said master jaws; a radially extending passage in each master jaw into which said legs extend, said legs having openings therethrough aligned with said last-mentioned passages; and a cam pin extending through each of said last-mentioned passages and through the pair of legs extending thereinto for moving the legs and clamping plates toward and away from the master jaws to clamp and release the clamping jaws on the master jaws.
Claim 3
Dependent Claim
69 words
The chuck defined in claim 1 in which: said forward-facing and rear surfaces on said master and clamping jaws having complementary serrations thereon spaced a common, substantially small distance apart to interlock the clamping jaw on the master jaw and to provide for adjustment of the clamping jaw relative to the master jaw in increments corresponding to the serration spacing when the clamping plate releases it from clamping engagement.
Claim 4
Dependent Claim
46 words
The chuck defined in claim 1 including: biasing means between said masTer jaws and said body portion for biasing the jaws toward workpiece releasing position; and actuating means operated by the drawbar of the machine for moving the jaws against the bias into workpiece clamping position.
Claim 5
Dependent Claim
66 words
The chuck defined in claim 3 in which: said actuating means comprises a member mounted to and movable with the machine drawbar; and bell crank levers mounted in the chuck and having their opposite legs engaging respectively said actuating means and a master jaw, whereby axial movement of the drawbar and actuating means effects radial movement of the jaws into and out of workpiece clamping position.
Claim 6
Dependent Claim
42 words
The chuck defined in claim 4 in which: the chuck and the actuating means are separately threaded on the spindle of the machine and the drawbar thereof; and in which the actuating means and chuck are interlocked to prevent relative movement therebetween.
Claim 7
Dependent Claim
32 words
The chuck defined in claim 1 including: means for locking the master jaws intermediate their extreme open and closed positions against radial movement to facilitate a machining operation on the clamping jaws.
Claim 8
Dependent Claim
49 words
The chuck defined in claim 6 in which said locking means comprises: locking pins slidable in the body portion and projectable into and out of openings in the master jaws; and a crank pin engaging each locking pin for effective reciprocating movement thereof into and out of locking position.
Claim 9
Dependent Claim
62 words
The chuck defined in claim 1 in which: said cam pin has cutout portions adjacent said leg openings whereby the remaining portions are eccentrically mounted with respect to the axis of the pin, said eccentric portions on turning of the pin, moving the legs and the clamping plate carried thereby to clamp and release the clamping jaw engagement with the master jaw.
Claim 10
Dependent Claim
71 words
The chuck as defined in claim 1 in which: each clamping plate and the pair of legs thereon is received in a radially extending T-shaped slot in a clamping jaw so that the clamping jaw is radially slidably movable relative to said clamping plate when released from the master jaw to provide for radial adjustment of the clamping jaw relative to the master jaw when released therefrom by the clamping plate.
Claim 11
Dependent Claim
39 words
The chuck defined in claim 1 in which: each master jaw having a substantially cylindrical body portion received within a complementary radially extending, cylindrical passage in the chuck body portion and presenting said forward-facing surface through said passage opening.
Claim 12
Dependent Claim
47 words
The chuck defined in claim 10 in which: said master jaw body portion has a substantially cylindrical head thereon eccentrically mounted with respect to the body portion and received within a recess in the chuck body portion to prevent rotation of the master jaw in its passage.
Claim 13
Dependent Claim
33 words
The chuck defined in claim 11 including: spring means in said chuck body portion bearing against the under surface of said master jaw head to bias the master jaw toward workpiece releasing position.
Claim 14
Dependent Claim
58 words
The chuck defined in claim 1 in which: each clamping plate and the legs thereon are received in a radially extending slot in a clamping jaw, the clamping jaw in its released position being radially movable relative to the clamping plate along said slot to provide for radial adjustment of the clamping jaw relative to the master jaw.
Claim 15
Dependent Claim
46 words
The chuck defined in claim 13 in which: said radially extending slot extends for the length of said clamping jaw so that said clamping jaw may be adjusted radially inwardly or outwardly through the point at which the clamping jaw is removed from the clamping plate.
Claim 16
Dependent Claim
14 words
The chuck defined in claim 14 in which: said radially extending slot is T-shaped.
Claim 17
Dependent Claim
43 words
The chuck defined in claim 2 including: biasing means for urging the clamping jaw away from the master jaw into its released position, the clamping jaw being moved against the urging of said biasing means into its clamped position on the master jaw.
Claim 18
Dependent Claim
54 words
The chuck defined in claim 1 in which: said annular body portion has an axially extending area and the radially extending passages in the body portion have openings communicating with said area; and in which the chuck further includes means for sealing the last-mentioned openings to prevent entry of contaminants therethrough into the passages.
Claim 19
Dependent Claim
40 words
The chuck defined in claim 17 in which: the sealing means includes a generally cylindrical sealing sleeve disposed axially within said body portion, whereby contaminants trapped therein are prevented by the sleeve walls from radial movement into the body passages.
Claim 20
Dependent Claim
78 words
The chuck defined in claim 18 in which: the chuck further includes an actuator for moving the jaws radially into workpiece clamping position; and the sealing sleeve having one axial portion telescoped with and in sliding, sealed engagement with the axially movable actuator, the sleeve having a further radially extending portion in sliding, sealed engagement with the radially movable master jaws, whereby the actuator and master jaws are sealed to the sleeve over their range of operative positions.
Claim 21
Dependent Claim
25 words
The chuck defined in claim 1 and including: means for rotatably locking the cam pin to prevent accidental unlocking and release of the clamping jaws.
Claim 22
Dependent Claim
34 words
The chuck defined in claim 20 in which: the locking means includes a spring-biased detent adapted to engage and lock the pin at an intermediate point prior to complete release of the clamping jaws.
Claim 23
Dependent Claim
52 words
The chuck defined in claim 8 wherein: the eccentric camming portions of the cam pin are offset around the pin circumference with respect to one another to compensate for twist of the pin when turned, whereby the camming portions upon twist of the pin are oriented together to fully cam both legs.
Claim 24
Dependent Claim
102 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a plurality of radially extending substantially cylindrical passages in said body, said passages opening toward the front of and being angularly spaced around said annular body portion; and a first jaw having a first substantially cylindrical body portion received within a corresponding one of said passages for radial movement within said passage, said jaw having a second body portion eccentrically mounted with respect to the first body portion and received within a corresponding recess in said annular body portion to prevent rotation of said jaw in said passage.
Claim 25
Dependent Claim
102 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a plurality of radially extending substantially cylindrical passages in said body, said passages opening toward the front of and being angularly spaced around said annular body portion; and a first jaw having a first substantially cylindrical body portion received within a corresponding one of said passages for radial movement within said passage, said jaw having a second body portion eccentrically mounted with respect to the first body portion and received within a corresponding recess in said annular body portion to prevent rotation of said jaw in said passage.
Claim 26
Dependent Claim
19 words
The chuck defined in claim 23 in which: the second body portion and its corresponding recess are substantially cylindrical.
Claim 27
Dependent Claim
26 words
The chuck defined in claim 24 in which: said second body portion has a greater diameter than said first body portion and forms a head thereon.
Claim 28
Dependent Claim
53 words
The chuck defined in claim 23 including: a second jaw connected to said first jaw at the front of said body portion, said second jaw being a clamping jaw for engaging and clamping a workpiece; and means for clamping both jaws into mating contact to interlock said second jaw on said first jaw.
Claim 29
Dependent Claim
48 words
The chuck defined in claim 26 wherein: said clamping means includes a clamping plate carrying the second jaw, the plate being actuable axially between clamped and released positions but restrained against radial movement, whereby the second jaw is radially adjustable along the clamping plate in the released position.
Claim 30
Dependent Claim
144 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a radially extending passage in the body portion and opening along its length toward the front of the body portion; a master jaw in the passage for radial movement therealong; a workpiece clamping jaw paired with the master jaw and having a rear surface adapted to be releasably clamped against the forward facing surface of the master jaw for radial movement of the jaw pair into and out of workpiece clamping position; means for releasably clamping the workpiece clamping jaw to the master jaw including a clAmping member having at least one leg extending therefrom into the master jaw; and means within the master jaw for moving the leg and clamping member toward and away from the master jaw to clamp and release the clamping jaw on the master jaw.
Claim 31
Dependent Claim
144 words
A chuck for clamping a workpiece in a machine comprising: an annular body portion; a radially extending passage in the body portion and opening along its length toward the front of the body portion; a master jaw in the passage for radial movement therealong; a workpiece clamping jaw paired with the master jaw and having a rear surface adapted to be releasably clamped against the forward facing surface of the master jaw for radial movement of the jaw pair into and out of workpiece clamping position; means for releasably clamping the workpiece clamping jaw to the master jaw including a clAmping member having at least one leg extending therefrom into the master jaw; and means within the master jaw for moving the leg and clamping member toward and away from the master jaw to clamp and release the clamping jaw on the master jaw.
Claim 32
Dependent Claim
36 words
The chuck defined in claim 28 in which: the means for moving the leg and clamping includes a radially disposed cam pin within the master jaw having a cam portion for engaging and camming the leg.
Claim 33
Dependent Claim
58 words
The chuck defined in claim 28 in which: each clamping member and the leg thereon are received in a radially extending slot in the clamping jaw, the clamping jaw in its released position being radially movable relative to the clamping plate along said slot to provide for radial adjustment of the clamping jaw relative to the master jaw.
Claim 34
Dependent Claim
46 words
The chuck defined in claim 30 in which: said radially extending slot extends for the length of said clamping jaw so that said clamping jaw may be adjusted radially inwardly or outwardly through the point at which the clamping jaw is removed from the clamping plate.
Claim 35
Dependent Claim
14 words
The chuck defined in claim 31 in which: said radially extending slot is T-shaped.
Claim 36
Dependent Claim
69 words
The chuck defined in claim 28 in which: said forward-facing and rear surfaces on said master and clamping jaws having complementary serrations thereon spaced a common, substantially small distance apart to interlock the clamping jaw on the master jaw and to provide for adjustment of the clamping jaw relative to the master jaw in increments corresponding to the serration spacing when the clamping member releases it from clamping engagement.
Claim 37
Dependent Claim
112 words
A workpiece clamping jaw for installation on a chuck, the chuck having a radially disposed master jaw to be paired with the clamping jaw for radially movement together into and out of workpiece clamping positions, the clamping jaw comprising: a one-piece solid structure having opposing ends; a rearwardly facing surface between said ends to be paired with a forward facing surface of the master jaw; a radially extending, T-shaped slot extending through the jaw between its opposing ends and adapted to receive a clamping plate, the plate being actuable to draw the said forward and rear faces into clamped or released engagement, and released clamping jaw being adjustable radially along the plate.
Claim 38
Dependent Claim
112 words
A workpiece clamping jaw for installation on a chuck, the chuck having a radially disposed master jaw to be paired with the clamping jaw for radially movement together into and out of workpiece clamping positions, the clamping jaw comprising: a one-piece solid structure having opposing ends; a rearwardly facing surface between said ends to be paired with a forward facing surface of the master jaw; a radially extending, T-shaped slot extending through the jaw between its opposing ends and adapted to receive a clamping plate, the plate being actuable to draw the said forward and rear faces into clamped or released engagement, and released clamping jaw being adjustable radially along the plate.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |