Expansible chamber devices – Bellows type expansible chamber – With separate biasing means
Patent
1984-05-15
1986-10-07
Garrett, Robert E.
Expansible chamber devices
Bellows type expansible chamber
With separate biasing means
92 92, 92 94, 92129, 92103F, 74126, 226164, F16H 2518
Patent
active
046152580
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a drive device, operated by pressure fluid, for producing a relative movement in the form of a progressive, linear, planar or three-dimensional swinging or turning movement of a driven element by means of at least one lifting element.
DESCRIPTION OF THE PRIOR ART
A linear drive device operated by pressure fluid for producing a relative displacement between a carriage-shaped drive unit and a curved-profile push strip is known. In that case, the drive unit has a plurality of piston-cylinder systems which are actuatable by pressure fluid and form step elements, the pistons of said systems resting against the profile of the push strip and the cylinders thereof being each connected via control valve means with the source of pressure fluid, each of the step elements forming, together with lever means pivoted, on the one hand, to the pistons of the step elements and, on the other hand, to the carriage housing, self-centering push-link drive elements.
This device can only be used if the driven object permits form-locked connection to the drive. This represents a very limiting and costly constraint on the external shape of this object.
SUMMARY OF THE INVENTION
The object of the present invention is to create a drive device which does not require this limitation and which permits a force-locked connection.
The drive device operated by pressure fluid in accordance with the invention is characterized by the fact that between the lifting element and the driven element there is at least one part which carries out a stepwise reciprocating motion under the influence of a lifting element in order to push the driven element forward stepwise via a force-locking in the loaded stepping direction.
BRIEF DESCRIPTION OF DRAWINGS
The subject matter of the invention will be explained below with reference to the figures, in which:
FIG. 1 is a longitudinal cross-section of a drive device according to the inflation with simultaneously inflatable, bellows-like force cells for short stroke;
FIG. 2 is a perspective view of a pressure plate with an opening to receive a roller for use in the device of FIG. 1;
FIG. 3 is a partial cross-section of the pressure plate of FIG. 2 with pressure roller mounted, seen from above;
FIG. 4 is a longitudinal cross-section of an alternative drive device with yoke-shaped attachment;
FIG. 5 is a side view of the drive of a wedge-shaped part;
FIG. 6 is a side view of a push drive for continuous advance;
FIG. 7 is a side view of a double wedge for a wedge thrust drive;
FIG. 8 is an end view of a cam drive;
FIG. 9 is a side view of a wedge thrust drive for producing a moment of rotation;
FIG. 10 is an exploded perspective view of a drive element with guide pins;
FIG. 11 is a perspective view of a planar arrangement of several drive elements;
FIG. 12 is a perspective view of a parallelepiped-shaped force cell;
FIG. 13 is a cross-sectional view showing the internal guidance of a membrane-like or bellows-like force cell;
FIG. 14 is a longitudinal cross-sectional view of a cell with needle bearing lying parallel to the wedge plane;
FIG. 15 is a longitudinal cross-sectional view of a drive device with clamping parts arranged in the manner of tongs.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a drive unit 10 with bellows-like force cells 13 and 14 which are simultaneously inflatable through a conduit 11 in a base part 12, and a plate 15 resting on said cells. A cam roller 16 which is mounted with a low friction mounting, such as ball bearings or roller bearings, flat bearings, transmits force from the force cells filled via the force conduit 11 with pneumatic or hydraulic pressure fluid to a driven intermediate part 17, for instance a wedge. The individual parts can, in case of small dimensions, be held together by double-sided adhesive foils on the contact surfaces 18, 19, 20, 21 of the force cells, which surfaces always remain flattened. When the two force cells 13 and 14 are fed via the conduit 11 with a pressure fluid, for instance compressed air, a force k
REFERENCES:
patent: 615717 (1898-12-01), Knapp
patent: 862867 (1907-08-01), Eggleston
patent: 2226201 (1940-12-01), Freysswet
patent: 2445862 (1948-07-01), Price
patent: 2644336 (1953-07-01), Bowditch
patent: 3494529 (1970-02-01), Beattie
patent: 3575330 (1971-04-01), Sniderman
patent: 3642186 (1972-02-01), Nemeth
patent: 4182150 (1980-01-01), Greven
Garrett Robert E.
Meyer Richard S.
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