Chucks or sockets – Expanding – Collet type
Patent
1987-07-01
1988-12-06
Desmond, Eugene F.
Chucks or sockets
Expanding
Collet type
B23B 522
Patent
active
047891696
DESCRIPTION:
BRIEF SUMMARY
Cross Reference to Related Application(s)
This United States application stems from PCT International Application No. PCT/SE86/00499 filed Oct. 30, 1986.
This invention relates to chucks adapted to clamp a workpiece during wood turning.
This chuck enables quick and easy clamping of a workpiece with good centricity without end support, e.g. for turning of bowls or dishes. The chuck also provides for unlimited repeated fixing and release of a single workpiece with very good repeating accuracy, which often is necessary at some machining operations. It is also possible to reverse rotation, e.g. for polishing, wherein the grindings will spray away from the mouth region and the protective goggles of the operator. The chuck has no protruding parts which can cause damage by engaging a tool, clothings or parts of the body.
The new and characterizing for the chuck according to the invention is disclosed in the accompanying claims.
The invention will now be more fully described with reference to the accompanying drawings, illustrating a preferred embodiment in which:
FIG. 1 is a sectional view, seen from the side of the chuck,
FIG. 2 is an elevational view from the workpiece gripping end of said chuck which in both views is ready to receive a workpiece, and FIGS. 3 and 4 are corresponding views showing the chuck in
clamping position with a workpiece.
The chuck according to the invention is assembled around a body 3, which at one end is attachable to a rotating machine. In the disclosed embodiment, this end is drilled and has a thread and a radial guide, adapted to the tool socket 1 of a lathe spindle. At the opposite end the body 3 is formed with two diametrically opposed excenters 8, 9 having equal excentricity.
Each of the excenters in this disclosed embodiment is enclosed by a clamping jaw 5 and 6 respectively, which are recessed together to form a mutual end surface. The clamping jaws are able to rotate half a turn about their respective excenter. They are also designed to together form a cylindrical disc, having the diameter D, when they are turned to the end positions shown in FIG. 2. When the elements are in their other end positions, they are radially displaced in opposite directions in relation to each other. The rotation of the clamping jaws about the excenters is hardly perceptable.
In FIG. 2 the reference E represents the distance between the center line of the body 3 and the center lines of the excenters 8, 9. The distance between the centerlines of the excenters is therefore 2E. If the diameter of the disc is formed when the clamping jaws are in their inner rotational end position is denoted D, the largest distance between the peripheries of the clamping jaws will be D+4E, which occurs when the jaws are in their other rotational end position. This position is shown in FIG. 4.
In the first rotational end position the clamping jaws 5, 6 are ready to receive a wood workpiece 7 for machining, and in the second rotational end position the object 10 is clamped by the jaws. This is shown in FIGS. 1 and 3 respectively.
In the disclosed embodiment, a sleeve 2 is mounted around the body 3, said sleeve being non-rotatably, but axially displaceable in relation to the body. The sleeve has a threaded boring, e.g. for a screw 4 which runs through the wall of the sleeve and projects with its end into a short axial groove in the body 3. The end of the sleeve 2 facing the lathe spindle 1 is so arranged that it always projects beyond the body 3. At the other end of the sleeve, the clamping jaws 5, 6 are partly recessed.
A cylindrical turned cavity having a diameter slightly larger than the diameter D formed by the clamping jaws 5, 6 when they are in their inner rotational end position, must be made in the bottom surface of a wood workpiece 7. The wood workpiece can now be attached to the chuck which has been threaded almost completely on the lathe spindle 1, i.e. so that there is only a small gap between the lathe spindle and the sleeve. The wood workpiece is placed on the chuck with the wall of the cylindrical cavity en
REFERENCES:
patent: 629747 (1899-07-01), Kuttler
patent: 3623741 (1971-11-01), Reeder et al.
patent: 4342348 (1982-08-01), Lichtenwalter et al.
patent: 4541465 (1985-09-01), Leadbeatter
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