Glass manufacturing – Glassworking or preform by or with reheating means – Work – workholder – or tool correlated burner control
Patent
1987-12-07
1989-05-23
Lindsay, Robert L.
Glass manufacturing
Glassworking or preform by or with reheating means
Work, workholder, or tool correlated burner control
65280, 65292, C03B 2311
Patent
active
048327263
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a holding chuck for glass-working machines which can be fed with tubes and which are intended for producing small bottles, ampoules or the like, with several clamping jaws which are guided in a basic body and can be shifted to and fro by means of an actuating lever acting on a thrust ring, and which have, their ends facing away from the clamping surfaces, engagement means guided in slots in the thrust ring.
German Patent Specification No. 676,625 makes known holding chucks of the type in question, in which the slots in the thrust rings are formed by encircling grooves, into which engage projections arranged at the ends of the clamping jaws and formed either by parts of the clamping jaws themsleves or by crosspins fastened to the clamping-jaw ends. The known solutions are not entirely satisfactory, inasmuch as both the outlay involved in producing the chuck and that necessary for adjusting its clamping jaws are comparatively high, and they lack possibilities of compensating the play of the clamping-jaw guides after a lengthy period of use.
SUMMARY OF THE INVENTION
The objection on which the invention is based is to provide a holding chuck of the type in question, of which the clamping jaws or clamping-jaw guides can be produced and adjusted in a simple way with great accuracy. According to the invention, this object is achieved because the engagement means for the clamping jaws are formed by balls which, on the one hand, are guided in cylindrical bores of a diameter matching them in the thrust ring and, on the other hand, are held in bores of the same diameter, extending perpendicularly relative to the axis of the first bores, at the ends of the clamping jaws which are narrower in relation to the ball diameter.
BRIEF DESCRIPTON OF THE DRAWINGS
A preferred exemplary embodiment of a holding chuck characterized by simplicity and good guide properties is explained in detail below with reference to the accompanying drawing. In the drawing:
FIG. 1 shows a side view of a holding chuck, partially in section,
FIG. 2 shows the end view of the holding chuck according to FIG. 1, and
FIG. 3 shows a top view of three holding chucks of a glassworking machine equipped with a plurality of holding chucks.
DESCRIPTION OF THE BEST MODES FOR CARRYING OUT THE INVENTION
In the Figures, 1 denotes an extension arm which is fastened to a revolving mount 2 of a glass-working machine and which carries a holding chuck, designated as a whole, by 3, for a glass tube or a tube made of another thermoplastically deformable material. The holding chuck includes a basic body 5 screwed to a tube 4 and equpped with guides 6 for three clamping jaws 7. The clamping jaws 7 have a guide part 8 of essentially triangular cross-section and a plate 9 of rectangular cross-section. The guide parts 8 of the clamping jaws 7 are mounted free of play in their guides. In order to preserve the freedom from play, headless setscrews 10, the position of which is secured by means of lock nuts 11, are used. The plates 9 are provided with transverse bores which form a cage for a ball 12. The plates 9 and the balls 12 are guided in a thrust ring 13 serving for actuating the clamping jaws. This thrust ring 13 is provided, on the one hand, with bores 14 for the balls 12 and, on the other hand, with slots 15 for the plates 9. An actuating lever 17 serves for subjecting the thrust ring 13 to an up-and-down movement in the direction of the longitudinal axis 16 of the holding chuck. The actuating lever 17 carries two rotatably mounted bolts 18 which engage into an annular groove 19 in the thrust ring 13. A spring 20 presses the thrust ring 13 into the position shown in FIGS. 1 and 2.
When the machine is in operation, the tube 4, the thrust ring 13 and the basic body 5 equipped with the clamping jaws 7 rotate. The spring 20 presses the clamping surfaces 21 of the clamping jaws up against a gripped tube not shown in the drawing. It is not possible for the clamping jaws 7 to rotate because of their essentially tria
REFERENCES:
patent: 3137557 (1964-06-01), Hobin
patent: 3792991 (1974-02-01), Couquelet
patent: 4142883 (1979-03-01), Dichter
patent: 4330317 (1982-05-01), Vertova
Patent Abstracts of Japan, vol. 9, No. 287, Nov. 14, 1985, and JP,A, 60131836, Jul. 13, 1985.
Lindsay Robert L.
Stone Mark P.
LandOfFree
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