Device for clamping and advancing elongated workpieces |
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| 申请号 | US3642186D | 申请日 | 1970-02-24 | 公开(公告)号 | US3642186A | 公开(公告)日 | 1972-02-15 |
| 申请人 | KOHO ES GEPIPARI MINISZTERIUM; | 发明人 | CSOVAK E; NEMETH J; | ||||
| 摘要 | For the advancing or feeding motion of bars, wires or the like up to now in most cases two hydraulic devices were used, one for gripping the rod and the other for moving it. According to the invention, to make the apparatus more simple, one single hydraulic cylinder is used for this purpose and according to one embodiment of the invention the piston moved in the hydraulic cylinder actuates at the beginning of its stroke the gripping means and thereafter it shifts this gripping means together with the rod or other workpiece; according to another embodiment the piston is used only for the moving or feeding but the gripping is produced by a series of rings actuated by the same hydraulic fluid which acts on the said piston. | ||||||
| 权利要求 | 1. In a fluid pressure device for clamping and advancing an elongated workpiece, comprising a stationary cylinder, a piston in the cylinder subjected to the action of a fluid pressure medium, said piston having an interior space through which the workpiece advances and which is isolated from said fluid pressure medium, a plurality of bellcrank levers engageable with the workpiece on the side of the piston opposite said medium, one aRm of each said lever contacting said piston and the other arm contacting the workpiece, a slotted disc in which the rotating pivots of the levers are disposed, said disc being disposed in the cylinder; the improvement comprising a plurality of shouldered pins (5) with a spring retainer (9) urged by a spring (6) in a direction opposite that in which the fluid pressure medium urges the piston so that the pins attached to the piston are supported on the spring retainer by their shoulders and extend through said slotted disc (3). 2. In a fluid pressure device for clamping and advancing an elongated workpiece a stationary cylinder, a series of segmented rings encircling and clamping the workpiece, an elastic cylindrical membrane enclosing the series of segmented rings and disposed in a ringlike fluid pressure space in such a way that said membrane delimits said space on one side, said stationary cylinder delimiting said space on the opposite side, said space communicating with a source of fluid pressure medium; the improvement comprising a further series of segmented power-transferring rings (17) outside the first-mentioned series (16) clamping the workpiece, elastic inserts (19) in the division plane of some of said rings, and keys (21) contacting the rings and inhibiting their turning. 3. A device as claimed in claim 2, there being three spaces in said cylinder (15), one of said spaces (I) being delimited by said cylindrical membrane (18), the other two (II) and (III) of said spaces being disposed on opposite sides of a piston (20) that moves the workpiece and the clamping rings. 4. A device as claimed in claim 3, and two heads (26 and 27) secured to a distance ring (25) disposed within said one space (I), said heads confining between them said rings and being slidably disposed in said stationary cylinder (15), one of the heads (27) being secured to said piston (20). 5. In a fluid pressure device for clamping and advancing an elongated workpiece, a piston (1) subjected to the action of the actuating medium and situated in a fluid pressure cylinder (7), at least two bellcrank levers (2) forced against the workpiece, one arm of said levers contacting said piston and the other arm of the same contacting the workpiece, the rotating pivots (4) of these levers being arranged in a slotted disc (3) fitted in the cylinder, the actuating piston being connected through at least two shouldered pins (5) with a spring retainer (9) working under the action of a spring in such a way that the pins (5) attached to the piston (1) are supported on the spring retainer (9) by their shoulders and are led through the slotted disc (3) holding the bellcrank levers (2). 6. In a fluid pressure device for clamping and advancing an elongated workpiece, a series of segmented rings (16) encircling and clamping the workpiece and an elastic cylindrical membrane (18) enclosing said series of segmented rings, which is situated in a ringlike fluid pressure space (I) in such a way that it delimits this space on one side, whereas the space is delimited on the other side by a stationary cylinder (25) and the said space communicates with a source of fluid pressure, a further series of segmented power-transferring rings (17) outside the series of segmented rings (16) clamping the workpiece, elastic inserts (19) in the division plane of the power-transferring rings, and keys (21) contacting said rings and inhibiting their turning. 7. A device according to claim 6, characterized by three spaces in the stationary pneumatic or hydraulic cylinder (15), from which one (I) is delimited by said cylindrical membrane (18), whereas the other two (II and III) are situated on both sides of a piston (20) which moves the workpiece and the clamping device. 8. A device according to claim 7, characterized by two heads (26 and 27) attached to the distance ring (25) situated within the fluid pressure space (I) of the series of segmented rings (16), said heads confining said rings between them, these heads Being slidably disposed in the stationary cylinder (15), one of the heads (27) being attached to the actuating piston (20). |
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