EP0066640B1 - Rapid advancing and retracting mechanism for clamping device - Google Patents
Rapid advancing and retracting mechanism for clamping device Download PDFInfo
- Publication number
- EP0066640B1 EP0066640B1 EP81104412A EP81104412A EP0066640B1 EP 0066640 B1 EP0066640 B1 EP 0066640B1 EP 81104412 A EP81104412 A EP 81104412A EP 81104412 A EP81104412 A EP 81104412A EP 0066640 B1 EP0066640 B1 EP 0066640B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nut
- spindle
- threads
- springs
- halves
- 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.)
- Expired
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B1/00—Vices
- B25B1/06—Arrangements for positively actuating jaws
- B25B1/10—Arrangements for positively actuating jaws using screws
- B25B1/12—Arrangements for positively actuating jaws using screws with provision for disengagement
- B25B1/125—Arrangements for positively actuating jaws using screws with provision for disengagement with one screw perpendicular to the jaw faces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/023—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same using screws
Definitions
- the present invention relates to a rapid operating mechanism for advancing or retracting the screw spindle of clamping means, for example clamps, vises, and such-like.
- clamping devices fall into two categories: manual type, and hydraulic type.
- manual type the application of the former is much limited due to the structure thereof, and adapted only to special C-clamps.
- such device entails a preparatory step to set the screw in operating position and is therefore inconvenient. For this reason, it is not preferably accepted by the public. While the cost of production of the latter is also high, it is not adapted to ordinary use.
- the layout of such device is inconveniently bulky, thus limiting its application to some specialized works.
- a yet known means to obtain the rapid advance or retraction of clamping means to fasten or release the workpiece is accomplished by an eccentric nut provided with thread means on half of its internal surface, which nut, normally does not in engagement with the screw spindle, yet when turned inside a hollow cylindrical body in the frame, will produce a radial displacement such that its half-threads engage with the screw spindle penetrating through it. Rapidly as it can fasten or release the workpiece, such device suffers several disadvantages as follows:
- the invention concerns a rapid advancing or retracting mechanism for a clamping device, comprising a screw spindle, a nut provided with female threads which can mesh with the male threads of said screw spindle, support means for said nut and spring means, said support means and spring means cooperating with each other so that when said nut is not in mesh with said spindle, at least part of said nut is resiliently urged against the spindle, insomuch that the screw spindle is allowed to make frictional axial movement in said nut, and the nut can frictionally co-rotate with said spindle, and a radial displacement of said nut with respect to the axis of said spindle is produced when the nut co-rotates with said spindle, so that the threads of said nut and the threads of said spindle engage when said spindle is turned in a first direction of rotation that produces axial advancing of the spindle, or disengage when said spindle is turned in a second direction of rotation that produces axial retracting
- the load is equally distributed to the two nut halves as well as the periphery of the screw spindle, thus largely reducing the wear thereof.
- the said two springs are interconnected in an end-to-end manner to define a loop wrapping around said nut halves and each of said two springs is provided with elongate slots extending along the length of the spring along the path that said pins make relative to the springs when each spring is turned in said hollow body, including an open slot and a close slot, separated by a stop piece which is so positioned that when the threads of said nut halves are completely in mesh with said screw spindle, the springs are stopped by said pins with their stop piece lying in the pins' path of relative motion.
- each spring is formed integrally by a piece of highly tough, resilient metal.
- Figure 4 is an embodiment of this invention.
- this invention comprises a hollow cylindrical body 1 for receiving a pair of split nuts 3, 3', resiliently retained in place by a pair of springs 4, 4'.
- the inner wall cylindrical body 1 is provided with two opposite pins 11 which form an integral part of cylindrical body 1.
- the broken lines with reference numerals 31 and 31' designate the female thread of the split nuts 3, 3'.
- the arrow X in Figures 1A and 1 B indicates the direction of the advance of the screw spindle 2.
- Each of the tails 42, 42' of springs 4, 4' is structured to engage with the heads 43', 43 of another spring.
- Figure 2 there is shown a plane view of one of the aforementioned springs, which is formed integrally by a highly tough, flexible and machine- able steel plate with two slots including a closed slot 44 and an open slot (not numeralled) extending along the length of the spring to allow a pin to pass through.
- a stop piece 41 divides the slot into two. Both sides of ends of the heads 43, 43' are flanged, to define an inserter 431 to insert into groove 33 and to abut the tail 42 of another spring, whereas only one side of the end of the tail 42 is flanged.
- a tapering 34, 34' of the thickness of the nut wall at the two margins is found to give better results.
- Figure 4 is an embodiment of this invention. In operation, one only needs to push the screw spindle 2 forward to touch the workpiece, and then fasten it with a few turns in the first direction. Likewise, while dismounting the workpiece, one only needs to make a turn in reverse direction, then pull the screw spindle 2 back.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
Description
- The present invention relates to a rapid operating mechanism for advancing or retracting the screw spindle of clamping means, for example clamps, vises, and such-like.
- Yet known clamping devices fall into two categories: manual type, and hydraulic type. Despite its relatively high cost of production, the application of the former is much limited due to the structure thereof, and adapted only to special C-clamps. Moreover, such device entails a preparatory step to set the screw in operating position and is therefore inconvenient. For this reason, it is not preferably accepted by the public. While the cost of production of the latter is also high, it is not adapted to ordinary use. Provided with a hydraulic chamber, the layout of such device is inconveniently bulky, thus limiting its application to some specialized works.
- A yet known means to obtain the rapid advance or retraction of clamping means to fasten or release the workpiece is accomplished by an eccentric nut provided with thread means on half of its internal surface, which nut, normally does not in engagement with the screw spindle, yet when turned inside a hollow cylindrical body in the frame, will produce a radial displacement such that its half-threads engage with the screw spindle penetrating through it. Rapidly as it can fasten or release the workpiece, such device suffers several disadvantages as follows:
- 1. Since only half of the inner wall is provided with thread, the load is mostly exerted on the threaded portion in operation, therefore largely increasing the wear of the thread and screw spindle. Moreover, such device cannot convert the torsion of the operator completely and efficiently into the pressure against the workpiece, particularly when the load is heavy.
- 2. The provision of a cylindrical body and the eccentric nut renders the size of the resulting assembly inconveniently large, which largely limits the use of such device. Also, the nut must provide enough number of threads to convert the angular torque into axial thrust, thus the required length is also inappropriately long.
- 3. In operation, only three effort points are bearing the propulsion of the screw spindle, thus causing the wear of the entrance and the exit of the cylindrical body, and enlarging the size of the opening thereof after long use, so that the screw spindle is liable to slacken during operation and fails to hold the workpiece snugly and securely.
- Another known means (US-A-3,669,440), comprising also a half-nut but supported by a yoke about the screw spindle, with a spring carried by the yoke bearing against the spindle, has the same deficiencies.
- Accordingly, it is the chief object of this invention to provide a rapid advancing and retracting mechanism to supersede the yet known means, thereby curing the deficiencies of the latter.
- The invention concerns a rapid advancing or retracting mechanism for a clamping device, comprising a screw spindle, a nut provided with female threads which can mesh with the male threads of said screw spindle, support means for said nut and spring means, said support means and spring means cooperating with each other so that when said nut is not in mesh with said spindle, at least part of said nut is resiliently urged against the spindle, insomuch that the screw spindle is allowed to make frictional axial movement in said nut, and the nut can frictionally co-rotate with said spindle, and a radial displacement of said nut with respect to the axis of said spindle is produced when the nut co-rotates with said spindle, so that the threads of said nut and the threads of said spindle engage when said spindle is turned in a first direction of rotation that produces axial advancing of the spindle, or disengage when said spindle is turned in a second direction of rotation that produces axial retracting of the spindle, characterized in that said nut comprises a pair of nut halves which, when completely meshing with the screw spindle, form an entire nut having a cylindrical outer surface, that said support means comprises a hollow body receiving said pair of nut halves therein and provided with two opposite pins projecting inwardly from its inner wall symmetrically to the central axis thereof, that said spring means comprise two springs each of which has one of its ends fixed to one end of one of said nut halves, so that the nut halves are resiliently biased toward the spindle, and that stop means are provided for preventing said nut halves and said spring means from further co-rotation in said first direction with said spindle when said nut halves are completely in mesh with the threads of said spindle.
- Owing to the pair of nut halves which constrict to knuckle the screw spindle when the latter is turned in one direction (i.e. the direction which results in advance) and expand to release the screw spindle when the latter is turned in the other direction (i.e. the direction which results in retract), the load is equally distributed to the two nut halves as well as the periphery of the screw spindle, thus largely reducing the wear thereof.
- According to a preferred feature of the invention, the said two springs are interconnected in an end-to-end manner to define a loop wrapping around said nut halves and each of said two springs is provided with elongate slots extending along the length of the spring along the path that said pins make relative to the springs when each spring is turned in said hollow body, including an open slot and a close slot, separated by a stop piece which is so positioned that when the threads of said nut halves are completely in mesh with said screw spindle, the springs are stopped by said pins with their stop piece lying in the pins' path of relative motion.
- Preferably, each spring is formed integrally by a piece of highly tough, resilient metal.
- Additional objects of the invention will be brought out in the following description of a preferred embodiment of the same taken in conjunction with the accompanying drawings, in which:
- Figure 1A is a partial sectional view of this invention in released condition;
- Figure 1 B is a partial sectional view as A, in engaged condition;
- Figure 2 is a graphical representation of one of the two same springs used in this invention, respectively showing the plan view, and edge view of the spring in straightened and bent states;
- Figure 3A and Figure 3B are respectively the transverse sectional views showing the screw spindle and the split nuts in disengaged and engaged state;
- Figure 4 is an embodiment of this invention. Referring now to Figures 1A and 1B, this invention comprises a hollow
cylindrical body 1 for receiving a pair ofsplit nuts 3, 3', resiliently retained in place by a pair ofsprings 4, 4'. The inner wallcylindrical body 1 is provided with twoopposite pins 11 which form an integral part ofcylindrical body 1. Referring to Figures 3A and 3B, the broken lines withreference numerals 31 and 31' designate the female thread of thesplit nuts 3, 3'. The arrow X in Figures 1A and 1 B indicates the direction of the advance of thescrew spindle 2. In Figure 3A, thethreads 31 and 31' ofnuts 3, 3' are not in mesh with themale thread 21 ofscrew spindle 2, thus allowing the screw spindle to be pushed axially to the working position or retracted directly without turning. Under such conditions, the twosplit nuts 3, 3' are spaced apart by a gap. However, in order to retain the twosplit nuts 3, 3' in position, they are interconnected by two likesprings 4, 4' which are connected in a head-to-tail manner to define a loop wrapping around the nuts. The outer surface of each ofsplit nuts 3, 3' is provided with agroove 33, 33' to receive theheads 43, 43' ofsprings 4, 4'. Each of thetails 42, 42' ofsprings 4, 4' is structured to engage with theheads 43', 43 of another spring. In Figure 2, there is shown a plane view of one of the aforementioned springs, which is formed integrally by a highly tough, flexible and machine- able steel plate with two slots including a closedslot 44 and an open slot (not numeralled) extending along the length of the spring to allow a pin to pass through. Astop piece 41 divides the slot into two. Both sides of ends of theheads 43, 43' are flanged, to define aninserter 431 to insert intogroove 33 and to abut thetail 42 of another spring, whereas only one side of the end of thetail 42 is flanged. Empirically, a tapering 34, 34' of the thickness of the nut wall at the two margins is found to give better results. - As shown in Figures 3A and 3B, when the
screw spindle 2 is turned in a first direction, thesplit nuts 3, 3' together withsprings 4, 4' are also turned in this direction until thestop pieces 41, 41' touch pins 11 so that thesplit nuts 3, 3' and thesprings 4, 4' can no more be turned. Now the gaps between the twosplit nuts 3, 3' diminish. A resulting nut fully in mesh withscrew spindle 2 is formed. Inasmuch as the nut can no more be turned, thescrew spindle 2 can now be turned in the first direction relative to the nut to produce an axial thrust. - To bring the state in Figure 3B back to that of Figure 3A, one only needs to make about half a turn of the
screw spindle 2 in a second or reverse direction. The operation of this invention is similar to the prior art, but the result is much better. Figure 4 is an embodiment of this invention. In operation, one only needs to push thescrew spindle 2 forward to touch the workpiece, and then fasten it with a few turns in the first direction. Likewise, while dismounting the workpiece, one only needs to make a turn in reverse direction, then pull thescrew spindle 2 back.
Claims (3)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81104412T ATE16084T1 (en) | 1981-06-09 | 1981-06-09 | FAST FORWARD AND RETRACTION MECHANISM FOR A JACK. |
DE8181104412T DE3172658D1 (en) | 1981-06-09 | 1981-06-09 | Rapid advancing and retracting mechanism for clamping device |
EP81104412A EP0066640B1 (en) | 1981-06-09 | 1981-06-09 | Rapid advancing and retracting mechanism for clamping device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP81104412A EP0066640B1 (en) | 1981-06-09 | 1981-06-09 | Rapid advancing and retracting mechanism for clamping device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0066640A1 EP0066640A1 (en) | 1982-12-15 |
EP0066640B1 true EP0066640B1 (en) | 1985-10-16 |
Family
ID=8187760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81104412A Expired EP0066640B1 (en) | 1981-06-09 | 1981-06-09 | Rapid advancing and retracting mechanism for clamping device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0066640B1 (en) |
AT (1) | ATE16084T1 (en) |
DE (1) | DE3172658D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9313633D0 (en) * | 1993-07-01 | 1993-08-18 | Black & Decker Inc | A clamp nut |
DE19844508B4 (en) * | 1998-02-19 | 2005-02-24 | Krumm Kg | puller |
DE29821143U1 (en) * | 1998-11-26 | 1999-02-25 | Kleinbongartz & Kaiser, 42853 Remscheid | Puller with quick adjustable pressure spindle |
CN114346562A (en) * | 2021-12-17 | 2022-04-15 | 江西洪都航空工业集团有限责任公司 | Clamping tool |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE705306C (en) * | 1938-11-25 | 1941-04-23 | Auto Union A G | Device for pushing out piston pins |
US3669440A (en) * | 1970-06-18 | 1972-06-13 | Wilton Corp | Quick engaging and disengaging nut mechanism |
-
1981
- 1981-06-09 DE DE8181104412T patent/DE3172658D1/en not_active Expired
- 1981-06-09 AT AT81104412T patent/ATE16084T1/en active
- 1981-06-09 EP EP81104412A patent/EP0066640B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0066640A1 (en) | 1982-12-15 |
ATE16084T1 (en) | 1985-11-15 |
DE3172658D1 (en) | 1985-11-21 |
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