JP4368861B2 - Swivel clamp - Google Patents

Description

  The present invention relates to a clamp of a type that rotates a clamp rod.

As this type of swivel clamp, for example, as shown in Patent Document 1, there is one configured as follows.
A clamp rod is inserted into the housing, and the intermediate height of the clamp rod is supported on the upper wall of the housing so as to be movable up and down, and the piston provided at the lower part of the clamp rod is movable up and down on the body of the housing. It is what I supported.
US Pat. No. 5,820,118

The above prior art has the following problems.
Since there is a fitting gap between the outer peripheral surface of the piston provided in the lower part of the clamp rod and the housing body, the clamp rod is moved by the fitting gap when the clamp rod is clamp driven. Is slightly tilted and the clamp rod cannot be guided accurately.
An object of the present invention is to enable a clamp rod to be guided with high accuracy.

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, the present invention provides a pivoting clamp as shown in FIGS. 1 to 4, 6 to 9, or FIGS. 10, 11, and 12. It was configured as follows.
A clamp rod 5 which is inserted into the housing 3 so as to be rotatable around an axis and clamped from one end to the other end in the axial direction, and a portion for fixing the cantilever arm 6, and one end of the housing 3 The first sliding portion 11 provided in the rod body 5a so as to be closely fitted and supported on the first end wall 3a on the side, and the input driven through the piston 15 inserted into the cylindrical hole 4 of the housing 3 The other end direction from the rod body 5a so as to be closely fitted and supported in the cylindrical hole of the support cylinder 13 which is mounted on the inside of the other end side of the housing 14 and the second end wall 3b. A clamp rod 5 provided in order in the axial direction with the second sliding portion 12 formed on the outer peripheral portion and having a plurality of guide grooves 26 that protrude integrally with each other and are arranged at substantially equal intervals in the circumferential direction;
A plurality of engagement tools 29 supported on the inner wall 13a of the cylindrical hole of the support cylinder 13 so as to be fitted in the plurality of guide grooves 26 provided in the second sliding portion 12, respectively.
Each of the plurality of guide grooves 26 includes a turning groove 27 and a rectilinear groove 28 provided continuously from the other end in the axial direction to the one end, and the plurality of turning grooves 27 are parallel to each other. And arranging the plurality of rectilinear grooves 28 in parallel with each other,
The clamp rod 5 is closely fitted to and supported by the housing 3 at the two locations of the first sliding portion 11 and the second sliding portion 12 arranged outward in the both end directions of the piston 15. The clamp rod 5 is configured to be prevented from tilting.

The present invention has the following effects.
Since the first and second sliding portions are provided on the clamp rod outside the both ends of the input portion, the clamp rod is strengthened by the two sliding portions separated in the axial direction. I can support it. For this reason, it is possible to prevent the clamp rod from being inclined and guide the clamp rod to the housing reliably and with high accuracy.
In addition, since the turning mechanism including the plurality of turning grooves and the plurality of engaging tools is provided between the second end wall having the above-described guide strength and the second sliding portion, the turning mechanism is provided. Can sufficiently withstand the turning torque, and the life of the turning mechanism is prolonged. In addition, since the plurality of engagement tools are provided on the second end wall, the installation location of the engagement tools can be used as the support location of the second sliding portion. For this reason, the height of the housing can be lowered, and the swivel clamp can be made compact.

In the present invention, for example, it is preferable to provide three or four guide grooves 26 in the second sliding portion 12 of the clamp rod 5, as shown in FIGS.

  In the present invention, for example, as shown in FIG. 1, FIG. 6, or FIGS. 10, 11, and 12, the outer diameter of the second sliding portion 12 of the clamp rod 5 is set to It is preferable to set a value smaller than the outer diameter of the first sliding portion 11.

  In this case, since the lead of the turning groove formed in the second sliding portion is shortened by reducing the outer diameter of the second sliding portion, the turning stroke of the clamp rod is shortened. For this reason, the swivel clamp can be made compact, and when the input portion is driven by the piston, the amount of pressure fluid supplied to the piston is reduced.

  A first embodiment of the present invention will be described with reference to FIGS. First, the entire structure of the swivel clamp will be described with reference to FIG. FIG. 1 is a partial sectional view of the clamp in an elevational view.

A housing 3 of a clamp 2 is fixed to the work pallet 1 by a plurality of bolts (not shown). A clamp rod 5 is inserted into the cylindrical hole 4 of the housing 3. An arm 6 is fixed to a desired turning position by a nut 7 at an upper end portion of the clamp rod 5, and a push bolt 8 is fixed to a tip portion of the arm 6. That is, the upper end portion of the clamp rod 5 is configured as a fixed portion for the cantilever arm 6.
An upper sliding portion (first sliding portion) 11 provided on the rod body 5a of the clamp rod 5 is slidably supported on the upper end wall (first end wall) 3a of the housing 3 so as to be slidable. . Further, the support cylinder 13 constituting a part of the lower end wall (second end wall) 3b of the housing 3 has a lower sliding portion (second sliding portion) 12 protruding downward from the rod body 5a. Is slidably supported. The upper sliding portion 11 and the lower sliding portion 12 are tightly fitted to the upper end wall 3a and the lower end wall 3b, respectively.
The outer diameter dimension of the lower sliding portion 12 is set to a value smaller than the outer diameter dimension of the upper sliding portion 11.

The means for driving the clamp rod 5 is configured as follows.
A flange-shaped input portion 14 is provided on the clamp rod 5 between the upper sliding portion 11 and the lower sliding portion 12. An annular piston 15 is fitted to the clamp rod 5 through a sealing tool 16 so as to be vertically movable and tightly fitted, and the piston 15 faces the input portion 14 from above. And said piston 15 is inserted in the said cylindrical hole 4 in the shape of a seal | tightness via another sealing tool 15a.

  Further, a radial bearing 24 is disposed between the input portion 14 and the piston 15, and the piston 15 is prevented from coming off by a retaining ring 25. Here, the radial bearing 24 is constituted by a number of metal balls, and can receive not only radial force but also vertical thrust.

A first chamber 21 for clamping is provided between the piston 15 and the upper end wall 3a, and a clamp spring 20 made of a compression coil spring is mounted in the first chamber 21. Further, a second chamber 22 for unclamping is provided between the piston 15 and the lower end wall 3b, and the second chamber 22 has a pressure oil supply / discharge port 19 for unclamping and a throttle chamber for throttling. Pressure oil is supplied and discharged through the oil passage 18.
The amount of pressure oil supplied from the oil passage 18 to the second chamber 22 is limited by the fitting gap G between the peripheral wall of the second chamber 22 and the outer peripheral surface of the piston 15. The discharge amount of the pressure oil from the second chamber 22 to the oil passage 18 is limited.

  A turning mechanism is provided across the lower sliding portion 12 of the clamp rod 5 and the upper portion of the inner wall 13a of the support cylinder 13. As shown in FIG. 1 and FIGS. 2 to 4, the turning mechanism is configured as follows. FIG. 2 is a cross-sectional view of the above-described turning mechanism in plan view. FIG. 3 is an enlarged view of the main part in FIG. 1, and corresponds to a cross-sectional view taken along line III-III in FIG. FIG. 4 is an enlarged development view of the outer peripheral surface of the lower sliding portion 12.

Three guide grooves 26 are provided on the outer peripheral surface of the lower sliding portion 12 at substantially equal intervals in the circumferential direction. Each guide groove 26 is an arcuate groove in a cross-sectional view, and is configured by connecting a spiral turning groove 27 and a rectilinear groove 28 upward. The plurality of swivel grooves 27 are arranged in parallel with each other, and the plurality of rectilinear grooves 28 are also arranged in parallel with each other. Of the adjacent guide grooves 26, 26, the partition wall has a minimum thickness between the lower part of the right turning groove 27 and the upper part of the left turning groove 27 in FIG. Is set to a value smaller than the groove width W of the guide groove 26. Further, the inclination angle A of the turning groove 27 is set to a small value within the range of about 11 degrees to about 25 degrees. In the illustrated clamp by spring force, the inclination angle A is preferably set to a value within the range of about 11 degrees to about 20 degrees in order to reduce the turning stroke.
Since the inclination angle A of the spiral turning groove 27 is thus reduced, the lead of the turning groove 27 is significantly shortened. For this reason, the stroke for turning of the clamp rod 5 is reduced.

Engaging balls 29 are inserted into the guide grooves 26 described above. Reference numeral 29a in FIGS. 3 and 4 indicates a fitting portion of the engagement ball 29 described above. The diameter D (see FIG. 3) of the engagement ball 29 is larger than the minimum thickness M of the partition walls of the adjacent swiveling grooves 27 and 27. Each engagement ball 29 is rotatably supported by three through holes 31 provided in the upper part of the inner wall 13a of the support cylinder 13. A sleeve 35 is fitted over the three engagement balls 29 so as to be rotatable around the axis. More specifically, a V-shaped groove 36 is formed on the inner peripheral surface of the sleeve 35, and the engagement ball 29 can roll at two points above and below the V-shaped groove 36.
The engagement ball 29 is inserted into the through hole 31 through a female screw hole 49 provided in the sleeve 35. A protrusion 50 a at the tip of the lid bolt 50 attached to the female screw hole 49 can receive the engagement ball 29.

Further, a stopper wall 45 for receiving the fitting portion 29 a of the engagement ball 29 is provided at the lower end portion of the turning groove 27. The receiving surface 45 a of the stopper wall 45 can be fitted to the engaging ball 29.
Further, a cutting surface 34 for preventing interference is provided at the opening edge of the guide groove 26. Thereby, even when the opening edge portion of the guide groove 26 is plastically deformed and rises due to the surface pressure of the engagement ball 29, interference between the raised portion and the inner wall 13a of the support cylinder 13 can be prevented. As a result, the clamp rod 5 rotates smoothly over a long period of time.

  As shown in FIG. 1, the outer wall 13b of the support cylinder 13 is prevented from rotating around the body portion 3c of the housing 3 via a positioning pin 38 extending in the vertical direction. Thereby, the turning phase of the clamp rod 5 with respect to the housing 3 can be accurately determined. The support cylinder 13 is fixed to the housing body 3c by a lock member 39 made of a retaining ring.

The swivel clamp 2 operates as follows.
In the state of FIG. 1, pressure oil is supplied to the second chamber 22 for unclamping, and as a result, the clamp rod 5 is raised to the swivel retracted position shown in the drawing.
When the clamp 2 is switched to the clamped state, the pressure oil in the second chamber 22 is discharged and the input portion 14 of the clamp rod 5 is pushed down by the clamp spring 20. Then, the clamp rod 5 descends while turning in the clockwise direction in plan view along the turning groove 27 and then descends straight along the rectilinear groove 28. Thereby, the clamp rod 5 is switched to a clamp position (not shown).

As shown by the arrows in FIG. 2, when the clamp rod 5 turns in the clockwise direction in a plan view, the engagement balls 29 fitted in the turning grooves 27 are counterclockwise in the plan view. At the same time, the sleeve 35 fitted on each of the engagement balls 29 is freely rotated in the counterclockwise direction. For this reason, between the inner peripheral surface of the sleeve 35 and each of the engagement balls 29, almost only the frictional friction acts and the slip friction hardly acts. The resistance acting on 29 is reduced. As a result, the frictional force acting on the turning groove 27 from each of the engagement balls 29 is reduced, and the clamp rod 5 is smoothly turned with a light force.
Here, the inner diameter of the sleeve 35 is set to a value about 1.5 times the outer diameter of the lower sliding portion 12 of the clamp rod 5. For this reason, when the clamp rod 5 is turned 90 degrees, the sleeve 35 rotates about 60 degrees.

  When the clamp 2 is switched from the clamped state to the swivel retracted state of FIG. Then, first, the piston 15 is raised by upward hydraulic pressure acting on the annular cross-sectional area, and at the same time, the clamp rod 5 is directed upwardly acting on the inner cross-sectional area of the sealing device 16. The oil pressure rises straight along the straight groove 28 by the oil pressure. Subsequently, the clamp rod 5 rises while turning counterclockwise in plan view along the turning groove 27, and the clamp rod 5 and the arm 6 are cut to the turning retracted position in FIG. Change.

In this case, as described above, the upward force acting on the piston 15 from the pressure oil in the second chamber 22 is not applied to the clamp rod 5, so that the swivel groove 27 and the engagement ball 29 are not affected. Excessive force does not work.
At the time of revolving, when the clamp rod 5 revolves counterclockwise in plan view, the engagement balls 29 and the sleeve 35 are in directions opposite to the arrows in FIG. Rotate to.

  Further, at the time of revolving, the receiving surface 45a of the stopper wall 45 is fitted into the fitting portion 29a of the engaging ball 29 as shown in FIGS. The pivot of the clamp rod 5 is prevented. For this reason, the turning stop accuracy of the clamp rod 5 is high. Further, since the stopper wall 45 is provided on the clamp rod 5, the following advantages can be obtained as compared with the case where the stopper wall 45 is provided on the body 3c of the housing 3. That is, the cylindrical hole 4 of the housing 3 can be made straight without the stepped portion for the stopper wall. For this reason, machining of the cylindrical hole 4 is facilitated, and the clamp spring 20 can be made large and strong.

The first embodiment further has the following advantages.
Since the clamp rod 5 is provided with a plurality of guide grooves 26 and the engagement balls 29 are fitted into the guide grooves 26, the support cylinder 13 is provided with the engagement balls 29 via the plurality of engagement balls 29. It becomes possible to support the clamp rod 5 almost uniformly in the circumferential direction. For this reason, it is possible to prevent the clamp rod 5 from being inclined during the clamp and unclamp drive. As a result, the positioning accuracy of the clamp position and the unclamp position of the push bolt 8 provided on the arm 6 is improved.

  Further, since the minimum thickness T of the partition walls of the adjacent guide grooves 26 and 26 is set to a value smaller than the groove width W of the guide groove 26, many guide grooves 26 are provided in the clamp rod 5. The clamp rod 5 can be supported substantially equally in the circumferential direction and the inclination angle A of the turning groove 27 can be reduced. For this reason, the stroke required for turning the clamp rod 5 can be reduced, and the turning clamp 2 can be made compact.

Since the upper sliding portion (first sliding portion) 11 and the lower sliding portion (second sliding portion) 12 are provided on the clamp rod 5 outside the both ends of the piston 15, the piston 15 is fitted. It is possible to prevent the clamp rod 5 from being tilted by the two sliding portions 11 and 12 that are separated in the axial direction, regardless of the presence of the gap. Therefore, the clamp rod 5 can be reliably and accurately guided by the housing 3.
Further, since the turning mechanism composed of the turning groove 27 and the engagement ball 29 is provided between the support cylinder 13 having the above-mentioned guide strength and the lower sliding portion 12, the turning mechanism is It is possible to sufficiently withstand the turning torque, and the life of the turning mechanism is extended. In addition, since the engagement ball 29 is provided on the support cylinder 13, the installation location of the engagement ball 29 and the support location of the lower sliding portion 12 can be used together. For this reason, the height of the housing 3 can be lowered and the swivel clamp 2 can be made compact.

  Further, since the outer diameter of the lower sliding portion 12 is set to a value smaller than the outer diameter of the upper sliding portion 11, the lead of the turning groove 27 formed in the lower sliding portion 12 is short. Become. For this reason, the turning stroke of the clamp rod 5 is further shortened. For this reason, the swivel clamp 2 can be made more compact, and the supply / discharge amount of the pressure oil for driving the piston 15 is reduced.

  FIG. 5 is a partial view similar to FIG. 4 and showing a modification of the first embodiment. In FIG. 5, the minimum thickness M of the partition walls of the adjacent swirling grooves 27 and 27 is set to a value smaller than that of FIG. 4, and the adjacent cutting surfaces 34 and 34 are formed at the portion of the minimum thickness M. It is overlapped. In FIG. 5, the inclination angle A of the turning groove 27 is set to a value within a range smaller than that of FIG. 4 (about 11 degrees to about 15 degrees).

The first embodiment and the modification can be changed as follows .
The inner peripheral surface of the sleeve 35, instead of one with a V-shaped groove 36 illustrated, may be a structure having a U-shaped groove or an arcuate groove, and further, the straight It may be a circumferential surface. In the case of the straight inner peripheral surface, in order to prevent the sleeve 35 from moving up and down with respect to the engagement ball 29, a gap between the inner wall 13 a of the support cylinder 13 and the sleeve 35 is provided. It is conceivable to provide a stopper such as a retaining ring.

  The inclination angle A of the spiral groove 27 formed in the spiral shape is preferably in the range of 10 degrees to 30 degrees, and more preferably in the range of 11 degrees to 20 degrees.

  6 to 9 show a second embodiment of the present invention, and FIGS. 10 to 12 show a third embodiment of the present invention. In these other embodiments, members similar to those of the first embodiment are given the same reference numerals in principle.

  In the second embodiment shown in FIGS. 6 to 9, FIG. 6 is a partial sectional view of the swivel clamp 2 in an elevational view and is similar to FIG. FIG. 7 is a sectional view of the turning mechanism provided in the clamp 2 in a plan view, and is similar to FIG. FIG. 8 is an enlarged view of the main part in FIG. 6 and corresponds to a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 9 is an enlarged development view of the lower sliding portion 12 provided on the clamp rod 5 of the clamp 2.

The second embodiment differs from the first embodiment in the following points.
The drive means of the clamp rod 5 is configured to be double acting. That is, the pressure oil for clamping is supplied to and discharged from the first chamber 21 provided above the piston 15 through the pressure oil supply / discharge port 17 for clamping. The unclamping pressure oil is also supplied to the second chamber 22 provided below the piston 15 via an unclamping pressure oil supply / discharge port (not shown) and an oil passage 18. Excluded.
A relatively large fitting gap is formed between the outer peripheral surface of the piston 15 and the cylindrical hole 4 on the upper and lower outer sides of the other sealing member 15a fitted to the outer periphery of the piston 15. ing. As a result, the clamp rod 5 is smoothly and accurately supported by the housing 3 at the upper and lower portions of the upper sliding portion 11 and the lower sliding portion 12.

Four guide grooves 26 are provided at substantially equal intervals in the circumferential direction on the outer peripheral surface of the lower sliding portion 12. As in the first embodiment described above, each guide groove 26 is formed by connecting a spiral turning groove 27 and a straight advance groove 28 upward, but the lower portion of the turning groove 27 extends in the vertical direction. It opens to the lower surface of the clamp rod 5 through a groove (no reference numeral). The engaging ball 29 can be inserted into the guide groove 26 through the opening.
As in the first embodiment, the partition between the lower part of the right turning groove 27 and the upper part of the left turning groove 27 in FIG. The minimum thickness M of the partition wall is set to a value smaller than the groove width W of the guide groove 26 and the diameter of the engagement ball 29.

  The engagement balls 29 inserted into the respective guide grooves 26 are rotatably supported by the four through holes 31 provided in the upper part of the inner wall 13a of the support cylinder 13. A sleeve 35 is fitted over the four engagement balls 29 so as to be rotatable around the axis. An arcuate recess 37 is formed in the turning groove 27, and the engagement ball 29 can roll into the turning groove 27 at two locations on the upper and lower sides of the recess 37.

A cylindrical spacer 32 is mounted between the lower part of the peripheral wall of the second chamber 22 for unclamping and the upper surface of the support cylinder 13. A squeezing groove 33 is formed on the upper surface of the spacer 32, and the squeezing groove 33 controls the amount of pressure oil supplied from the oil passage 18 to the second chamber 22. . A through hole or the like can be used instead of the groove 33.
The support cylinder 13 is pressed and fixed to the housing body 3c by a lock member 39 made of a male screw cylinder.
As in the first embodiment, the outer diameter dimension of the lower sliding portion 12 is set to be smaller than the outer diameter dimension of the upper sliding portion 11. For this reason, the lead of the spiral turning groove 27 is shortened, and the turning stroke of the clamp rod 5 is reduced.

FIG. 10 shows a third embodiment of the present invention. FIG. 10 is a partial sectional view of the swivel clamp in an elevational view and is similar to FIG.
The third embodiment shown in FIG. 10 differs from the structure shown in FIG. 6 only in the following points.
The sleeve 35 in FIG. 6 is omitted. The engagement balls 29 supported on the inner wall 13 a of the support cylinder 13 are prevented from coming off by the spacers 32.

FIG. 11 shows a first modification of the third embodiment, and is similar to FIG.
The first modification of FIG. 11 differs from the structure of FIG. 10 in the following points.
The piston 15 is formed integrally with the clamp rod 5. Between the piston 15 and the lower end wall 3b, the second chamber 22 and the pressure receiving exclusion cylinder hole 41 are sequentially provided downward. The cylinder hole 41 is formed by the inner peripheral surface of the adapter cylinder 42, and the sealed portion 5 b of the clamp rod 5 is inserted into the cylinder hole 41 in a tightly sealed manner by the sealing tool 43.

With the above configuration, the upward force acting on the clamp rod 5 at the time of unclamping is only the hydraulic pressure acting on the annular cross-sectional area obtained by subtracting the transverse area of the enclosed portion 5b from the transverse area of the second chamber 22. Therefore, excessive force does not act on the turning groove 27 and the engagement ball 29.
The diameter of the enclosing portion 5b may be a value smaller than the diameter of the second chamber 22, and here, the diameter is set to be approximately the same as the diameter of the upper sliding portion 11 of the clamp rod 5. .
In addition, it is preferable to set the diameter of the enclosing portion 5b to a value larger than the diameter of the upper sliding portion 11. In this case, since the upward force acting on the clamp rod 5 during unclamping can be further reduced, the life of the turning groove 27 and the engagement ball 29 is extended.

Similar to FIG. 10, a relatively large fitting gap is formed between the outer peripheral surface of the piston 15 and the upper half portion of the cylindrical hole 4. A relatively large fitting gap is also formed between the enclosed portion 5 b of the clamp rod 5 and the cylinder hole 41.
The throttle groove 33 is formed in the lower end surface of the oil passage 18.
Further, a rod 46 for detecting a clamped state and an unclamped state protrudes downward from the lower sliding portion 12. A detection tool (not shown) is screwed into a screw hole 47 formed in the rod 46, and a sensor (not shown) such as a limit switch faces the detection tool.

Further, a plug 51 is tightly fitted in the lower portion of the support cylinder 13, and the internal space of the cylinder hole 41 is communicated to the outside by a breathing path 52 provided in the plug 51. As shown in the schematic diagram, the breathing path 52 is provided with a trap valve 53 formed of a spring check valve.
The trap valve 53 operates as follows. When the clamp rod 5 is raised and the internal space of the cylinder hole 41 expands, the trapping valve 53 prevents the cutting oil or the like in the outside atmosphere from entering the cylinder hole 41 due to the non-return action of the trap valve 53. To do. Further, when the clamp rod 5 is lowered and the internal space of the cylinder hole 41 contracts, the trap valve 53 removes the pressure oil that has entered the internal space of the cylinder hole 41 from the second chamber 22 to the outside. To discharge smoothly.

  FIG. 12 shows a second modification of the third embodiment, which is similar to FIG. 10 described above. This FIG. 12 shows a single-acting spring return-type swivel clamp 2, which is different from the structure shown in FIG. 10 in the following points.

The piston 15 is formed integrally with the clamp rod 5. An unclamping return spring 56 is mounted in the second chamber 22 formed between the support cylinder 13 and the piston 15, and the clamp rod 5 is biased upward by the return spring 56. . Here, the return spring 56 is constituted by a compression coil spring. The lower end of the spring 56 is brought into contact with the support cylinder 13, and the upper end of the spring 56 is received by the piston 15 through a thrust ball bearing 57.
Further, the sleeve 35 is rotatably fitted over the plurality of engaging balls 29.
The trap valve 53 is attached to a bolt 58 screwed to the center portion of the support cylinder 13.

Each of the above-described embodiments and modifications can be further modified as follows.
The guide rods 26 of the clamp rod 5 are preferably provided with three or four, but may be provided with two or may be five or more. Further, the guide groove 26 may be provided with a cam-like groove instead of the illustrated spiral turning groove 27.
The minimum thickness T of the partition walls of the adjacent guide grooves 26 and 26 may be a value smaller than the diameter of the engagement ball 29. Accordingly, the minimum thickness T can be set to a value larger than the groove width W of the guide groove 26.
Further, the engaging tool inserted into the guide groove 26 may be a cylindrical pin or the like instead of the exemplified ball 29.

The pressure fluid supplied to and discharged from the first chamber 21 or the second chamber 22 may be a gas such as another type of liquid or air instead of the exemplified pressure oil.
The clamp rod 5 is swung in the clockwise direction in plan view when the clamp is operated. Alternatively, it may be swung in the counterclockwise direction in plan view when the clamp is operated. Of course, the turning angle of the clamp rod 5 can be set to a desired angle such as 90 degrees, 60 degrees, and 45 degrees.

FIG. 2 is a partial cross-sectional view showing the first embodiment of the present invention in an elevational view of the swivel clamp. It is sectional drawing of planar view of the turning mechanism provided in the said clamp. It is an enlarged view of the principal part in said FIG. 1, Comprising: It is a figure corresponded in the III-III arrow directional cross-sectional view in said FIG. It is an expanded development view of the lower sliding part provided in the clamp rod of the clamp. The modification of said 1st Embodiment is shown and it is the partial figure similar to said FIG. It is a fragmentary sectional view of the clamp of 2nd Embodiment of this invention of the elevation view, Comprising: It is a figure similar to said FIG. It is sectional drawing of planar view of the turning mechanism provided in the clamp of said 2nd Embodiment, Comprising: It is a figure similar to said FIG. It is an enlarged view of the principal part in said FIG. 6, Comprising: It is a figure corresponded in the VIII-VIII arrow directional cross-sectional view in said FIG. FIG. 5 is an enlarged development view of a lower sliding portion provided on the clamp rod of the clamp according to the second embodiment, similar to FIG. 4 described above. FIG. 7 shows a clamp according to a third embodiment of the present invention, similar to FIG. 6 described above. The 1st modification of said 3rd Embodiment is shown and it is a figure similar to said FIG. The 2nd modification of 3rd Embodiment same as the above is shown and it is a figure similar to FIG. 10 same as the above.

DESCRIPTION OF SYMBOLS 3 ... Housing, 3a ... 1st end wall (upper end wall), 3b ... 2nd end wall (lower end wall), 5 ... Clamp rod, 6 ... Arm (cantilever arm), 11 ... 1st sliding part (upper slide) Moving part), 12 ... second sliding part (lower sliding part), 14 ... input part, 15 ... piston, 20 ... clamp spring, 21 ... first chamber for clamping, 22 ... second chamber for unclamping , 24 ... radial bearings, 26 ... guide grooves, 27 ... turning grooves, 28 ... rectilinear grooves, 29 ... engaging tools (engaging balls), 31 ... through holes, 35 ... sleeves, A ... inclination angles of the turning grooves 27.

Claims (3)

A clamp rod (5) which is inserted into the housing (3) so as to be rotatable around an axis and clamped from one end to the other end in the axial direction, and a portion for fixing the cantilever arm (6); A first sliding portion (11) provided on the rod body (5a) so as to be closely fitted and supported on the first end wall (3a) on one end side of the housing (3); and the housing (3) An input portion (14) driven through a piston (15) inserted into the cylindrical hole (4) of the housing and an inner side of the other end side of the housing (3) are mounted on the second end wall (3b). A plurality of guide grooves that protrude integrally from the rod body (5a) in the other end direction and are arranged at substantially equal intervals in the circumferential direction so as to be closely fitted and supported in the cylindrical hole of the supporting cylinder (13) that constitutes A clamp rod (5) provided with a second sliding portion (12) having (26) formed on the outer peripheral portion in order in the axial direction;
A plurality of engagement tools (29) supported on the inner wall (13a) of the cylindrical hole of the support cylinder (13) so as to be fitted into a plurality of guide grooves (26) provided in the second sliding portion (12), respectively. )
Each of the plurality of guide grooves (26) includes a turning groove (27) and a rectilinear groove (28) provided continuously from the other end in the axial direction to the one end, and the plurality of turning grooves ( 27) are arranged in parallel with each other and the plurality of straight grooves (28) are arranged in parallel with each other,
The clamp rod (5) is connected to the housing (3) at two locations, the first sliding portion (11) and the second sliding portion (12), which are arranged outward in the both end directions of the piston (15). ) Is tightly fitted and supported so as to prevent the clamp rod (5) from tilting . The swivel clamp according to claim 1,
A swiveling clamp characterized in that three or four guide grooves (26) are provided in the second sliding portion (12) of the clamp rod (5). The swivel clamp according to claim 1 or 2,
The turning characterized in that the outer diameter of the second sliding portion (12) of the clamp rod (5) is set to a value smaller than the outer diameter of the first sliding portion (11). Type clamp.

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