GB2213080A - Collet chuck - Google Patents
Collet chuck Download PDFInfo
- Publication number
- GB2213080A GB2213080A GB8728471A GB8728471A GB2213080A GB 2213080 A GB2213080 A GB 2213080A GB 8728471 A GB8728471 A GB 8728471A GB 8728471 A GB8728471 A GB 8728471A GB 2213080 A GB2213080 A GB 2213080A
- Authority
- GB
- United Kingdom
- Prior art keywords
- petals
- shroud
- collet chuck
- collet
- hereof
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
- B23B31/201—Characterized by features relating primarily to remote control of the gripping means
- B23B31/202—Details of the jaws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
The chuck, for use on woodturning lathes, comprises three or more petals 2 defining a circular section counter bore and being joined adjacent their lower extremities to a base 4 adapted for affixation directly or indirectly to a driven spindle, e.g. via a sleeve 11, and a shroud 7 adapted to fit about the petals, the internal surface of the shroud and the external surfaces of the petals coacting to move the petals progressively radially inwards by axial shroud movement thus captivating any plug or other such object which may be present in the counter bore. The shroud 7 is retained in a variety of positions about the petals by a ring 10. <IMAGE>
Description
IMPROVED OOLLEr CHUCK
The present invention relates to a collet type chuck as may be utilised on a woodturning lathe or other wood turning machine.
Before a piece of wood may be worked on a lathe it must
first be affixed in some manner to a drive spindle. It is extremely important that such method of affixation is as
secure as possible particularly where it is desired to produce hollow forms which may not be additionally stabilised by an opposing spindle or other work support element.
At present expanding collet chucks are being utilised to
secure pieces of woodwork to lathes and such expanding collet chucks are designed to expand within a counter bore provided in the base of the piece being worked. In order that the base of the piece being worked may resist the forces generated by the outwardly expanding collet chuck its base must be relatively thick adjacent the periphery of the counter bore and hence shaping of the base of the piece adjacent the counter bore whilst the piece is still on the lathe is often not possible. The fact that some shaping of the base of a piece is usually necessary furthermore dictates that the counter bore be relatively shallow and consequently the available area for contact between the expanding collet chuck and the piece is relatively small.
Some of the problems associated with expanding collet chucks may be overcome by utilising external chucks which close around a plug of circular section forming part of or inserted into the base of a piece to be worked thus allowing shaping of the base of the piece whilst still on the lathe; the plug later being cut off flush with the base. Existing external dixis however, particularly those of the three jaw variety,have been found inadequate insofar as rings have to be utilised to spread the forces generated by the steel jaws closing around a wooden plug.
In addition to the rings being inconvenient they have still been known to work loose and present a significant danger to the user in such event.
It is accordingly the object of the present invention to alleviate one or more of the disadvantages associated with existing chucks or at least provide the consumer with a choice.
According to the present invention there is provided an external collet chuck with a collet comprising three or more petals defining a circular section counter bore and being joined adjacent their lower extremities to a base adapted for affixation directly or indirectly to a driven spindle; a shroud adapted to fit about the ~ petals, the internal surface of the shroud and the external surfaces of the petals being shaped such that in use urging the shroud upwards from the base around the petals causes the petals to move progressively radially inwards thus captivating any plug or other such object which may be present in the counter bore; means for locking the shroud in a variety of positions about the petals.
One embodiment of the present invention will now be with reference to the accompanying drawings in which:
Figure 1 is an end view of a collet in accordance with
the present invention;
Figure 2 is an exploded side elevation of the components
of a chuck in accordance with the present invention,
partly in section.
The embodiment of figures 1 and 2 depict a collet 1 comprising eight petals 2 defining a circular cross-section counter bore 3 and being joined at their lower extremity to a base portion 4. It should be noted that the petals comprise a thickened portion 5 displaying an external taper 6 adapted to co-operate with internal taper 7 of shoud 8. The petals additionally comprise a thin flexible portion 9 adjacent the base 4 in order to accommodate the radially inward movement exerted when shroud 8 is urged upwardly such as to engage taper 7 with taper 6.
It has been found that the collet may advantageously be fabricated from 10/40 or 10/45 6-8 ton tensile stronger than mild steel.
The embodiment of figures 1 and 2 further utilises a locking ring 10 and a main body 11.
In operation the components would be assembled as follows.
The internal thread of locking ring 10 would be engaged with the external thread of main body 11 and the ring would be run down to an area adjacent the base and driven spindle engaging end of the main body. The shroud 8 would be placed over the opposite end of the main body and it should be noted that such shroud is not internally threaded. The external threads on the base 4 of the collet may then be engaged with the internal threads 12 of the main body and the assembled chuck engaged with external threads of a drive spindle of a lathe by means of internal threads 12 at the base of main body 11. A piece of wood (not shown) would normally then be engaged in the collet jaws and two "C" spanners inserted in the locking holes 13 of the main body and locking ring.The "C" spanner engaged with the main body may then be moved anti-clockwise and the "C" spanner engaged with the locking ring. move clockwise. This motion will cause the shroud to move along the main body towards the collet thus closing the jaws of the collet upon the piece of wood in counter bore 3. It should be noted that the external thread on the main body and the internal thread of the locking ring are lefthanded such that the rotation of the driven spindle of a conventional lathe will tend to further secure the piece of work in annular void 3 rather than loosen locking ring 10.
The embodiment lastmentioned has been found to provide a particularly stable mount for a piece of wood insofar as counter bore 3 is relatively deep. The fact that shroud 8 does not itself rotate with respect to the collet during closing of the collet jaws is furthermore considered significant insofar as ease of operation is enhanced due to lessened friction between the tapered surfaces. The lastmentioned embodiment utilises a twelve degree taper on the external surface of the collet although those skilled in the art will appreciate that other specifications are possible. A fifty millimetre diameter counter bore has additionally been found to be practical.
It will be appreciated that apparatus in accordance with the present invention is superior in many aspects to other types of chucks presently available. For example a chuck similar to that used in relation to power drills utilises a stationary ring and movable jaws with the jaws mowing towards the work as they close. This type of chuck does not permit quick centering and predictable placement of the work as each time the chuck is open or closed the work may end up in a different position on a lathe.
Claims (6)
1. An external collet chuck with a collet comprising three or
more petals defining a circular section counter bore and
being joined adjacent their lower extremities to a base
adapted for affixation directly or indirectly
to a driven spindle; a shroud adapted to
fit about the petals, the internal surface of
the shroud and the external surfaces of the petals being
shaped such that in use urging the shroud upwards from the
base around the petals causes the petals to move progressively
radially inwards thus captivating any plug or other such
object which may be present in the counter bore; means
for locking the shroud in a variety of positions about the
petals.
2. A collet chuck in accordance with claim 1 hereof wherein
the means for locking the shroud in a variety of positions
about the petals is an internally threaded locking ring.
3. A collet chuck in accordance with claim 1 hereof wherein
the base of the collet is externally threaded in order that
it may be screwed into an internally threaded circular
cross section tubular body portion; the shroud being
annular in configuration and adapted to pass over the
tubular body portion; the external surface of the tubular
body portion being threaded such that an internally threaded
locking ring may be run up on the body to lock the shroud
in a variety of positions about the petals.
4. A collet chuck in accordance with claim 1 hereof wherein there
is a taper on the external faces of the petals such that they
increase in diameter towards their free ends; a corresponding
taper on the internal surface of the shroud such that urging
the shroud upwards from the base around the petals causes the
petals to move progressively radially inwards.
5. A collet chuck in accordance with claim 1 hereof wherein the
petals are defined by linear longitudinal cuts; the petals
being capable of resilient radial deflection in an outward
direction due to a thin walled portion adjacent their lower
extremities acting as a
6. A collet chuck in accordance with claim 1 hereof wherein there
are provided eight petals and wherein the petals are fabricated
from steel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU81687/87A AU8168787A (en) | 1987-11-25 | 1987-11-25 | Collet chuck |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8728471D0 GB8728471D0 (en) | 1988-01-13 |
GB2213080A true GB2213080A (en) | 1989-08-09 |
Family
ID=3760322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8728471A Withdrawn GB2213080A (en) | 1987-11-25 | 1987-12-04 | Collet chuck |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU8168787A (en) |
GB (1) | GB2213080A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU664251B2 (en) * | 1992-04-02 | 1995-11-09 | Keith Edward Seaman | Expanding collet chuck |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB738826A (en) * | 1952-09-10 | 1955-10-19 | Hardinge Machine Tools Ltd | Improvements in or relating to chucks |
GB968612A (en) * | 1961-10-17 | 1964-09-02 | Prince Machines Ltd | Improvements relating to collets |
GB1151170A (en) * | 1966-12-03 | 1969-05-07 | Sutemaru Mizoguchi | A Chuck |
GB1297898A (en) * | 1970-09-21 | 1972-11-29 | Houdaille Industries Inc | |
US4171820A (en) * | 1977-09-26 | 1979-10-23 | Universal Automatic Corporation | Collet assembly |
-
1987
- 1987-11-25 AU AU81687/87A patent/AU8168787A/en not_active Abandoned
- 1987-12-04 GB GB8728471A patent/GB2213080A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB738826A (en) * | 1952-09-10 | 1955-10-19 | Hardinge Machine Tools Ltd | Improvements in or relating to chucks |
GB968612A (en) * | 1961-10-17 | 1964-09-02 | Prince Machines Ltd | Improvements relating to collets |
GB1151170A (en) * | 1966-12-03 | 1969-05-07 | Sutemaru Mizoguchi | A Chuck |
GB1297898A (en) * | 1970-09-21 | 1972-11-29 | Houdaille Industries Inc | |
US4171820A (en) * | 1977-09-26 | 1979-10-23 | Universal Automatic Corporation | Collet assembly |
Also Published As
Publication number | Publication date |
---|---|
GB8728471D0 (en) | 1988-01-13 |
AU8168787A (en) | 1989-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |