JP2006116612A - Swing clamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swing clamp device, lowering the installation cost to be advantageously applied to clamping a low-volume production articles. <P>SOLUTION: A cylindrical rod 14 in which a male screw member 81 is inserted is inserted, with a part projected to the outside in a cylindrical housing 12 fixed to a base 104, and the male screw member 81 is engaged with a female screw part 32 in the cylindrical housing 12 in a male screw part 98, wherein as the screw members are fastened, the cylindrical rod 14 is moved to be drawn in the cylindrical housing 12 and also rotated by rotating mechanisms 68, 54. The cylindrical rod 14 is thus rotated and moved to be drawn in, thereby clamping a predetermined article 108 between a swing arm 80 and a base 104 provided on the cylindrical rod 14 and fixing the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a swing clamp device, and in particular, has a swing arm that can rotate about one axis and move in the axial direction, and a predetermined article can be clamped by the rotation and movement of the swing arm in the axial direction. The present invention relates to an improved structure of a swing clamp device that is fixed.

  Conventionally, various clamping devices have been used to fix and hold an object such as a workpiece (workpiece) or a jig plate on a predetermined base such as a base of a machine tool. . A swing clamp device is known as a kind of the clamp device (see, for example, Patent Documents 1 and 2).

  In general, the swing clamp device is a housing composed of a cylinder or the like that is fixed to a base and the like, and the housing is rotatably and protruded / retracted with a portion on one side in the axial direction protruding outside. A rod member made up of a piston rod or the like inserted so as to obtain, and a swing arm provided in a fixed position in a state of extending in a direction perpendicular to the axis with respect to the protruding portion of the rod member from the housing . Then, by introducing pressurized oil or compressed air into the housing, the rod member can be retracted / projected relative to the housing.

  Further, in such a conventional swing clamp device, a guide groove extending in the axial direction is provided on one of the inner peripheral surface of the housing and the outer peripheral surface of the rod member. Furthermore, either one of them is provided with a guide pin that enters and slides into the guide groove, or the guide ball can roll in the guide groove and the inner periphery of the housing. The surface and the outer peripheral surface of the rod member are accommodated in a state where they are brought into contact with a surface on which the guide groove is not formed and cannot be detached.

  Thus, in the conventional swing clamp device having such a structure, the guide pin slides with respect to the guide groove when the rod member is retracted into the housing by introducing pressurized oil or compressed air into the housing. The rod member can be rotated by a predetermined angle by being squeezed or by rolling the guide ball in the guide groove. As a result, the swing arm provided in a fixed position on the rod member is positioned on the base, for example, rotated to the position where the work is arranged, and the work is moved between the swing arm and the base. It is clamped between the two so that it can be fixed.

  If the conventional swing clamp device having such a structure is used, after the workpiece or the like is arranged at a predetermined position on the base, the rod member is simply pulled into the housing and automatically moved to the arrangement position of the workpiece. The workpiece can be clamped and fixed very easily and quickly between the swing arm and the base that are positioned accordingly.

  However, in the conventional swing clamp device, as described above, the rod member is protruded / retracted (operated) by a hydraulic mechanism or a pneumatic mechanism using pressurized oil or compressed air. Therefore, when installing such a swing clamp device, large and expensive auxiliary equipment such as piping, manifolds, couplings, pumps, etc. constituting the hydraulic mechanism or pneumatic mechanism are required, and the installation cost is avoided. I couldn't.

  Therefore, in such a conventional swing clamp device, for example, when used when machining a workpiece, if the amount of the workpiece is small, the machining cost per workpiece is excessively increased. The problem was inherent.

JP 2003-39262 A Japanese Utility Model Publication No. 5-56334

  Here, the present invention was made in the background as described above, and the problem to be solved is that large and expensive incidental equipment is advantageously omitted, and the installation cost is reduced. It is an object of the present invention to provide an improved swing clamp device structure that can be effectively achieved, thereby reducing the processing cost per article processed in a clamped state as low as possible.

  In order to solve such a problem, the first aspect of the present invention includes (a) a cylindrical housing that is erected and fixed on a predetermined base, and (b) the cylindrical housing. An internally threaded portion provided in a fixed position on the inside; and (c) projecting from the tubular housing so that it can rotate with the axially one side portion projecting outside. A cylindrical rod inserted so that a part of the portion can be retracted and moved into the cylindrical housing; and (d) the cylindrical rod when the cylindrical rod is retracted and moved into the cylindrical housing. On the other hand, a biasing means for applying a biasing force in a direction opposite to the moving direction, and (e) a state of extending in a direction perpendicular to the axis with respect to the protruding portion of the cylindrical rod from the cylindrical housing. Swing provided to fix the position at And (f) the tubular member is inserted into the tubular rod so as to be rotatable, and the portion on the distal end side in the insertion direction into the tubular rod is inserted into the tubular housing. A pressing portion that is arranged so as to be movable in the pull-in movement direction of the rod into the cylindrical housing, and that presses the cylindrical rod in the pull-in direction as the rod moves in the pull-in direction, and the cylindrical housing A male threaded portion that engages with the female threaded portion in the cylindrical housing and is provided at the tip side portion that projects into the cylindrical housing, and the pulling is performed as the male threaded portion is tightened with respect to the female threaded portion. A male screw member that is moved in a direction to press the cylindrical rod with the pressing portion and to be pulled into the cylindrical housing against the urging force of the urging member; and (g) the cylinder Between the cylindrical housing and the cylindrical rod Then, a part of the linear motion of the cylindrical rod when the cylindrical rod is retracted and moved into the cylindrical housing is converted into a rotational motion, and the cylindrical rod is moved into the cylindrical housing. A rotation mechanism that rotates the cylindrical rod in accordance with the retraction movement, and the movement of the male screw member and the rotation mechanism cause the cylindrical rod to rotate while being retracted and moved into the cylindrical housing. The swing arm is rotated to a predetermined article arrangement position positioned on the base to position the article, and the article is clamped between the swing arm and the base. The swing clamp device is characterized by the following.

  In short, in this first aspect, the male screw member inserted into the cylindrical rod is rotated, and the male screw portion of the male screw member is tightened to the female screw portion provided inside the cylindrical housing. By doing so, the cylindrical rod is retracted and moved into the cylindrical housing while being rotated by the rotation mechanism. Then, the swing arm provided in a fixed position on the cylindrical rod is rotated and positioned to a predetermined article placement position positioned on the base on which the cylindrical housing is fixed, and further, The article is clamped and fixed between the swing arm and the base.

  Furthermore, in other words, in the first aspect, without using a complicated mechanism such as a hydraulic mechanism or a pneumatic mechanism, a simple screw mechanism is used, and the male screw member is simply tightened. A given article can be clamped and fixed very easily and quickly.

  Therefore, in the first aspect of the swing clamp device according to the present invention as described above, the operability equivalent to that when using a hydraulic mechanism or a pneumatic mechanism is sufficiently secured, while being installed on a predetermined base. In addition, such an excellent feature that large and expensive incidental facilities such as piping, manifolds, couplings, and pumps constituting the hydraulic mechanism and the pneumatic mechanism can be completely omitted can be exhibited extremely advantageously.

  Moreover, in the second aspect of the swing clamp device according to the present invention, the male screw member is exposed to the outside at the tip of the protruding portion of the cylindrical rod from the cylindrical housing; The male threaded portion is formed on the outer peripheral surface, is rotatably inserted into the cylindrical rod, and is in a state in which it can move integrally with the head, and a leg portion that is inserted into the cylindrical housing. Thus, the cylindrical rod is constituted by a bolt member having the outer flange-shaped pressing portion that is brought into contact with the distal end surface of the protruding portion of the cylindrical rod.

  In the second aspect, the rotation operation with respect to the head of the male screw member made of a bolt member that protrudes from the cylindrical housing and is exposed to the outside can be performed from the outside. Accordingly, the rotation operation of the male screw member can be performed using a screw tightening device such as a pneumatic or electric impact wrench or a nut runner, for example. As a result, the feature that the fastening of the male screw member to the female screw portion can be performed more quickly with a stable fastening force is exhibited.

  Furthermore, in the third aspect of the swing clamp device according to the present invention, the male screw member is pulled into and out of the cylindrical rod through the opening on the distal end side of the protruding portion of the cylindrical rod from the cylindrical housing. On the other hand, a male screw part is formed on the outer peripheral surface on the distal end side of the projecting portion of the cylindrical rod, and a nut member is screwed to the male screw part. An engaging portion that engages with a surface of the pressing portion of the male screw member that is opposite to the contact side with the tip surface of the protruding portion of the cylindrical rod is integrally formed.

  According to the third aspect, the male screw member inserted into the cylindrical rod is simply loosened and removed from the cylindrical rod by simply loosening the nut member screwed into the male screw portion of the cylindrical rod. It can be freely removed from the cylindrical rod. Therefore, the feature that the male screw member can be easily replaced is exhibited.

  Furthermore, in the fourth aspect of the swing clamp device according to the present invention, the portion of the protruding portion of the cylindrical rod that is closer to the cylindrical housing than the portion where the male screw portion is formed is directed toward the cylindrical housing. On the other hand, the swing arm is provided with a through hole in which a tapered surface corresponding to the tapered surface of the fitting portion of the cylindrical rod is provided on the inner side. The swing arm is formed of an independent member separate from the cylindrical rod, and the swing arm is externally inserted into the protruding portion of the cylindrical rod in the through hole, and is tapered with respect to the fitting portion of the protruding portion. The nut member is engaged with the male thread portion of the cylindrical rod and screwed into contact with the swing arm, so that the swing arm is fitted to the protruding portion of the cylindrical rod. It adapted to be provided in a position fixed with.

  According to the fourth aspect, the nut member screwed into the male threaded portion of the cylindrical rod is simply loosened and detached from the cylindrical rod, and can be fitted into the fitting portion of the cylindrical rod. The swing arm can be freely detached from the cylindrical rod. Therefore, the feature that the swing arm can be easily replaced is exhibited.

  In the fifth aspect of the swing clamp device according to the present invention, the male screw member is formed of a metal material having a smaller hardness than the metal material forming the female screw portion provided in the cylindrical housing. It becomes.

  In the fifth aspect, when the tightening operation on the female screw portion of the male screw member and the loosening operation from the tightened state are repeatedly performed, the wear amount of the male screw portion in the male screw member is made larger than the wear amount of the female screw portion. The Thereby, the use durability of the male screw member is made lower than the use durability of the female screw portion. As a result, for example, unlike the case where the hardness of the metal material of the male screw member is the same as that of the metal material of the female screw part, or the case where the hardness of the latter is made smaller than the former, the male screw member By replacing the male screw member and the female screw part without changing both the male screw part and the simple and quick work, the male screw member can be smoothly tightened and loosened with respect to the female screw part for a longer period of time. It can be maintained stably and reliably.

  Furthermore, in the sixth aspect of the swing clamp device according to the present invention, the female thread portion is provided on an inner peripheral surface of a cylindrical body that is separate from the cylindrical housing and can be inserted into the cylindrical housing. Then, the cylindrical body is inserted into the cylindrical housing and fixed in a detachable manner, so that the female screw portion is provided in a fixed position inside the cylindrical housing.

  According to the sixth aspect, the internal thread portion can be freely detached from the inside of the cylindrical housing simply by removing the cylindrical body having the internal thread portion formed on the inner peripheral surface from the inside of the cylindrical housing and releasing it. Can be removed. Therefore, when the female thread portion is worn, the female thread portion can be easily replaced. By adopting the configuration according to the fifth aspect at the same time, the smooth operability in the tightening and loosening operation of the male screw member with respect to the female screw portion can be maintained more stably and reliably over a longer period of time. You can be kidnapped.

  And in the 1st aspect of the swing clamp apparatus according to this invention, installation cost is compared with the conventional apparatus using a hydraulic mechanism or a pneumatic mechanism, for example by exhibiting the outstanding characteristics as mentioned above. Can be reduced very advantageously.

  Therefore, when the swing clamp device according to the present invention is used, a conventional device using a hydraulic mechanism or a pneumatic mechanism is used when a relatively small amount of articles are sequentially clamped and processed. Compared to the case, the processing cost per article to be processed can be kept as low as possible. As a result, improvement in work efficiency and cost reduction in small-scale production by machining the target article can be achieved extremely advantageously.

  Moreover, according to the 2nd aspect of the swing clamp apparatus according to this invention, the clamping operation of a predetermined | prescribed article | item can be performed more easily and rapidly by exhibiting the feature to make it show. In addition, various adverse effects caused by insufficient clamping force on the clamped article can be reliably prevented, and processing operations on the clamped article can be more stably performed.

  Furthermore, according to the 3rd aspect of the swing clamp apparatus according to this invention, the advantage that the maintenance by replacement | exchange of a male screw member becomes easy is acquired.

  Furthermore, according to the fourth aspect of the swing clamp device according to the present invention, there is an advantage that maintenance by exchanging the swing arm is easy.

  Further, according to the fifth aspect of the swing clamp device according to the present invention, the smooth clamping operation can be stably and reliably maintained for a longer period of time simply by replacing the male screw member. .

  Furthermore, according to the sixth aspect of the swing clamp device according to the present invention, the smooth clamping operation can be continued more stably and reliably over a longer period of time simply by replacing the female screw portion. You can be kidnapped.

  Hereinafter, in order to clarify the present invention more specifically, the configuration of the swing clamp device according to the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 to FIG. 3 show an embodiment of a swing clamp device having a structure according to the present invention in its upper surface form and two longitudinal sectional forms formed by cutting at two cutting lines orthogonal to each other. , Respectively, are shown schematically. As is clear from these drawings, the swing clamp device 10 of this embodiment includes a cylindrical housing, 12 and a cylindrical rod.

  More specifically, the cylindrical housing 12 has a square cylinder shape with a low height as a whole, including an inner hole 20 that opens in the vertical direction through the upper opening 16 and the lower opening 18. . Further, the cylindrical housing 12 has a stepped cylindrical surface shape whose diameter is increased by a predetermined dimension on the lower opening 18 side than the upper opening 16 side. Thereby, the inner hole 20 has a large-diameter inner hole portion 22 surrounded by a large-diameter cylindrical inner peripheral surface on the lower opening 18 side, and a small-diameter cylindrical inner side on the upper opening 16 side. It has a small-diameter inner hole portion 24 surrounded by the peripheral surface.

  Further, in the large-diameter inner hole portion 22 on the lower opening 18 side in the inner hole 20 of the cylindrical housing 12, a female thread portion forming bush 26 as a cylindrical body is coaxially inserted and positioned. ing. The female thread portion forming bush 26 is made of a metal material having high hardness such as iron, and protrudes a predetermined dimension in the radial direction and continuously extends in the circumferential direction on the cylindrical portion 28 and the outer peripheral surface of the lower end portion of the cylindrical portion 28. The outer flange portion 30 is integrally formed as described above. And the internal thread part 32 is formed over the internal peripheral surface of the cylindrical part 28 of this internal thread part formation bush 26 over predetermined length.

  Further, a set screw screw hole 34 is formed with a predetermined depth on the lower end surface of the outer flange portion 30 of the female screw portion forming bush 26. Further, the set screw screw hole 34 is formed with a side hole 36 that extends straight from the side surface on the bottom side to the side and opens on the outer peripheral surface of the outer flange portion 30. A set screw 38 is screwed into the set screw screw hole 34. Further, in the side hole 36, the side hole 36 extends in a state where the pressing ball 40 and the pressing pin 42 are in contact with each other and a part of the pressing ball 40 protrudes into the screw hole 34 for the set screw. The storage position is movably movable in the exit direction.

  As described above, the internal thread portion forming bush 26 inserted into the large-diameter inner hole portion 22 of the cylindrical housing 12 is a male screw formed on the outer peripheral surface of the outer flange 30. The internal thread provided on the inner peripheral surface on the opening 18 side is screwed to a position where further screwing is impossible. In such a state, the pressing pin 42 in the side hole 36 is pressed to the side by the outer peripheral surface of the set screw 38 screwed into the set screw screw hole 34 via the pressing ball 40. Then, the inner thread surface of the cylindrical housing 12 on the lower opening 18 side is engaged so as to prevent the rotation of the female screw portion forming bush 26.

  As a result, in this case, the internal thread portion forming bush 26 is fixed in the large-diameter inner hole portion 22 of the cylindrical housing 12 so that it cannot be displaced in the circumferential direction and the axial direction on the same axis and can be easily attached and detached. Therefore, the female thread portion 32 is provided on the inner side of the cylindrical housing 12 so as to be easily detachable and fixed in position so as to extend in the axial direction on the same axis.

  In addition, a plurality of (here, two) pin holes 43 are provided on the lower end surface of the outer flange portion 30 of the female thread portion forming bush 26. Thereby, for example, pins 106 (indicated by a two-dot chain line in FIG. 2) protruding on a base 104 (shown by a two-dot chain line in FIGS. The cylindrical housing 12 is fixed in a non-rotatable state in a state where the cylindrical housing 12 is erected on the base.

  Further, a compression coil spring 45 as a biasing means is provided at the lower end of the large-diameter inner hole portion 22 of the cylindrical housing 12 in which the female thread portion forming bush 26 is inserted and fixed. The internal thread portion forming bush 26 is disposed in contact with the upper end surface of the outer flange portion 30 and is extrapolated to the cylindrical portion 28. That is, here, the compression coil spring 45 is positioned in the large-diameter inner hole portion 22 of the cylindrical housing 12 in a state where it can exert a biasing force against the downward pressing force. is there.

  A guide bush 46 is accommodated in the small diameter inner hole portion 24 on the upper opening 18 side in the inner hole 20 of the cylindrical housing 12. As shown in FIGS. 2 and 4, the guide bush 46 has a thin cylindrical shape as a whole, and an outer flange portion 48 projecting a predetermined dimension in the radial direction is integrally formed on the outer peripheral surface of the lower end portion. It is installed around. In addition, one fixing bolt insertion hole 50 penetrating in the thickness direction is provided in each of the axially opposed intermediate portions in the radial direction.

  Further, in the guide bush 46, a guide ball receiving hole 52 penetrating through the part is formed between the axially intermediate part where the two fixing bolt insertion holes 50 are formed and the part where the outer flange portion 48 is formed. Three are formed at equal intervals in the circumferential direction. In each of the guide ball housing holes 52, one steel guide ball 54 is housed so as not to move in the axial direction of the guide bush 46 and to be able to roll. Further, the guide ball 54 accommodated in each guide ball accommodation hole 52 has a substantially half portion protruding toward the inside of the guide bush 46 through the inner opening of the guide ball accommodation hole 52. It is positioned.

  Such a guide bush 46 is coaxially inserted into the large-diameter inner hole portion 22 of the inner hole 20 of the cylindrical housing 12. The front ends of the fixing bolts 56, 56 respectively screwed into two radially opposing portions at the upper end of the housing 12 are inserted into the fixing bolt insertion holes 50.

  Thus, the guide bush 48 is fixed in the large-diameter inner hole portion 22 of the cylindrical housing 12 so as not to be displaced in the axial direction and the circumferential direction on the same axis. Under such a fixed state, a substantially half portion of the guide ball 54 accommodated in each guide ball accommodation hole 52 protrudes into the small-diameter inner hole portion 24 in the inner hole 20 of the cylindrical housing 12. I'm hurt. Further, the outer flange portion 48 is positioned to enter the small diameter inner hole portion 24 in the inner hole 20 of the cylindrical housing 12, and the upper end surface of the outer flange portion 48 is the inner periphery of the cylindrical housing 12. Of the surfaces, a step surface 49 formed between an inner peripheral surface portion surrounding the large-diameter inner hole portion 22 and an inner peripheral surface portion surrounding the small-diameter inner hole portion 24 is brought into contact with the surface.

  2 and 3, 44 is a lid that covers the lower opening 18 of the cylindrical housing 12 together with the outer flange 30 of the female thread forming bush 26, and 58 is an upper opening. 16 and a scraper for preventing entry of foreign matter into the cylindrical housing 12 from between the cylindrical rod 14 inserted through it.

  On the other hand, the cylindrical rod 14 which comprises the swing clamp apparatus 10 with the cylindrical housing 12 is exhibiting the substantially cylindrical shape as a whole, as FIG. 1 thru | or FIG. 3 shows. Moreover, in this cylindrical rod 14, the outer level | step difference surface 60 and the inner side level | step difference surface 62 which exhibit a flat toric surface shape are each provided in the outer peripheral surface and inner peripheral surface of a lower part side part. . Then, the lower part of the outer and inner stepped surfaces 60 and 62 is formed as a large-diameter part 64 having an inner diameter and an outer diameter larger than the upper part by a predetermined dimension. On the other hand, the portion above the large diameter portion 64 is a small diameter portion 66.

  Further, as apparent from FIGS. 2 to 4, in the small diameter portion 66 of the cylindrical rod 14, the inner peripheral surface is a cylindrical surface having the same diameter and extending in the axial direction. On the other hand, the outer peripheral surface of the small-diameter portion 66 is a cylindrical surface with a lower portion than the substantially central portion in the axial direction extending with the same outer diameter in the axial direction. And three guide grooves 68 are formed in the lower part of this cylindrical outer peripheral surface so as to extend in the vertical direction with a constant phase difference in the circumferential direction.

  As shown in FIGS. 4 and 5, these three guide grooves 68 all have the same form with a semicircular cross-sectional shape. That is, each guide groove 68 has a spiral groove portion 70 whose lower portion extends spirally in a counterclockwise direction upward, while its upper portion is a straight groove portion that extends straight in the vertical direction (axial direction). 72.

  Further, as shown in FIGS. 2 to 4, the outer peripheral surface of the upper end portion of the small diameter portion 66 is a cylindrical surface having a smaller diameter than the outer peripheral surface of the lower end portion where the three guide grooves 68 are formed, and The internal thread 74 is provided there. Furthermore, a circumferential groove 76 having a predetermined depth is provided in a portion immediately below the upper end where such an internal thread 74 is provided on the outer peripheral surface. Furthermore, the outer peripheral surface of the portion between the formation portion of the circumferential groove 76 and the lower portion having the cylindrical outer peripheral surface is a tapered surface that gradually decreases in diameter upward. A portion whose outer peripheral surface is a tapered surface is a fitting portion 78.

  In this case, a swing arm 80 is externally inserted into the cylindrical rod 14 as described above, and a clamp bolt 81 as an external thread member is inserted into the inner hole.

  As is apparent from FIGS. 1 to 3, the swing arm 80 extrapolated to the cylindrical rod 14 has a generally long rectangular block shape as a whole, and a lower end surface of the swing arm 80 and a flat clamp surface 82. Has been. Further, a through hole 84 is formed at one end of the swing arm 80 in the length direction so as to penetrate the portion in the vertical direction. The through hole 84 has a cylindrical inner peripheral surface having an inner diameter larger than the outer diameter of the small diameter portion 66 of the cylindrical rod 14. Further, an inner flange portion 86 projecting inward is integrally provided at the upper end portion of the inner peripheral surface of the through hole 84.

  A spacer bush 88 having a tapered inner peripheral surface corresponding to the tapered surface of the fitting portion 78 provided in the small diameter portion 66 of the cylindrical rod 14 is provided in the through hole 84 of the swing arm 80. Is inserted. Thus, a tapered surface corresponding to the tapered surface of the fitting portion 78 in the small diameter portion 66 of the cylindrical rod 14 is provided inside the through hole 84 on the inner peripheral surface of the spacer bush 88.

  A spacer bush 88 forming a tapered surface corresponding to the tapered surface of the fitting portion 78 inside the through hole 84 is penetrated by an inner flange portion 86 projecting from the inner peripheral surface of the upper end of the through hole 84. The upward escape from the inside of the hole 84 is prevented. Of course, such a tapered surface may be provided directly on the inner peripheral surface of the through hole 84 without using the spacer bush 88. Further, in FIGS. 1 to 3, reference numeral 90 denotes a bolt hole into which a not-shown push bolt is screwed.

  Such a swing arm 80 is externally inserted into the small-diameter portion 66 of the cylindrical rod 14 in the through-hole 84 with the clamp surface 82 facing downward. In the spacer bushing 88 having a tapered inner peripheral surface positioned inside, a taper fitting is performed with respect to a fitting portion 78 having a tapered outer peripheral surface provided in the small diameter portion 66 of the cylindrical rod 14. It has been. And in such a fitting state, with respect to the internal thread 74 provided on the outer peripheral surface of the upper end portion of the small diameter portion 66 of the cylindrical rod 14, the fixing nut 92 is provided at the lower end surface of the upper end surface of the swing arm 80. Are screwed together to press. Here, a screw hole 75 is provided on the side surface of the fixing nut 92, and a pin 77 is formed in the screw hole 75 on the outer peripheral surface where the female screw 74 of the cylindrical rod 14 is formed by a set screw 79. By being positioned in the pressed state, unnecessary rotation of the fixing nut 92 from the tightened state with respect to the female screw 74 is prevented.

  Thus, the swing arm 80 is fixed to the upper end portion side portion of the small-diameter portion 66 of the cylindrical rod 14 so as not to be displaced in the axial direction and the circumferential direction in a state of extending in a direction perpendicular to the axis therefrom. Further, the swing arm 80 thus fixed to the cylindrical rod 14 eliminates the taper fitting with the fitting portion 78 after removing the fixing nut 92 screwed to the upper end portion of the cylindrical rod 14. By being caulked, it can be easily detached from the cylindrical rod 14. As a result, replacement is facilitated.

  On the other hand, the clamp bolt 81 inserted into the inner hole of the cylindrical rod 14 has a lower hardness than that of a hard metal material such as iron that constitutes the female thread portion forming bush 26, such as a copper alloy. Made of metal material. Then, a head portion 94 having a hexagonal shape that cannot be inserted into the inner hole of the cylindrical rod 14 and a leg portion 96 having a length that is substantially the same as or longer than the cylindrical rod 14 by a predetermined dimension. Have and be configured. Further, a male screw portion 98 that can be screwed into a female screw portion 32 provided in the large-diameter inner hole portion 22 of the cylindrical housing 12 is formed on the outer peripheral surface of the distal end portion of the leg portion 96. Furthermore, an outer flange portion 100 as a pressing portion having an outer diameter larger than the inner diameter of the inner hole of the cylindrical rod 14 is integrally provided at the base portion of the leg portion 96 on the head 94 side.

  The leg 96 of the clamp bolt 81 can be rotated coaxially and through the upper opening in the inner hole of the cylindrical rod 14 in substantially the entire portion excluding the portion where the outer flange 100 is formed. The male screw portion 98 that is inserted and provided on the outer peripheral surface of the distal end portion of the leg portion 96 is positioned in the large diameter portion 64 of the cylindrical rod 14. On the other hand, the outer flange portion 100 formed integrally with the base portion of the leg portion 96 is in contact with the upper end surface of the cylindrical rod 14. Further, the head 94 of the clamp bolt 81 is protruded upward from the inner hole of the cylindrical rod 14 and exposed to the outside. In such a state, the outer peripheral portion of the outer flange portion 100 integrally protrudes in the form of an inner flange on the inner peripheral surface of the upper end of the fixing nut 92 that is screwed into the male screw 74 at the upper end portion of the cylindrical rod 14. It is sandwiched between the formed engaging portion 102 and the upper end surface of the cylindrical rod 14 and positioned.

  Thus, in this case, the clamp bolt 81 is positioned in the inner hole of the cylindrical rod 14 so as not to move in the axial direction although it can rotate. Further, such a clamp bolt 81 is positioned so as to protrude upward from the inner hole of the cylindrical rod 14, and can be easily rotated by an external operation on the head 94 exposed to the outside. It has become. Furthermore, the clamp bolt 81 inserted into the inner hole of the cylindrical rod 14 can be easily removed from the cylindrical rod 14 by removing the fixing nut 92 screwed into the upper end of the cylindrical rod 14. It can be removed, thereby facilitating replacement.

  Thus, in the present embodiment, the cylindrical rod 14 in which the clamp bolt 81 is inserted as described above is positioned so that the upper portion of the small-diameter portion 66 where the swing arm 80 is fixed in position protrudes to the outside. In the crimped state, the lower portion of the small-diameter portion 66 where the three guide grooves 68 are formed on the outer peripheral surface and the large-diameter portion 64 are coaxially inserted into the inner hole 20 of the cylindrical housing 12. Yes. In such a state, the upward projecting portion of the cylindrical housing 12 from the inner hole 20 can be retracted into the inner hole 20 and can be projected again from the retracted movement state. Further, the cylindrical rod 14 is assembled to the cylindrical housing 12.

  That is, the large diameter portion 64 of the cylindrical rod 14 inserted into the inner hole 20 of the cylindrical housing 12 is positioned in the large diameter inner hole portion 22 of the inner hole 20 and is fixed thereto. Further, it is inserted into the cylindrical portion 28 of the female thread portion forming bush 26. The inner step surface 62 in the large-diameter portion 64 is brought into contact with the upper end portion of the compression coil spring 45 accommodated in the large-diameter inner hole portion 22.

  In other words, here, the large diameter portion 64 of the inner cylindrical rod 14 is inserted into the large diameter inner hole portion 22 of the cylindrical housing 12 so that the compression coil spring 45 is compressed by a predetermined amount. In the crimped state, the inner stepped surface 62 of the large-diameter portion 64 of the cylindrical rod 14 and the upper end surface of the outer flange portion 30 of the female screw portion forming bush 26 are interposed. The cylindrical rod 14 is urged upward by the urging force generated by the compression of the compression coil spring 45. In the present embodiment, the outer stepped surface 60 of the large-diameter portion 64 of the cylindrical rod 14 has the outer flange portion 48 of the guide bush 46 positioned within the large-diameter inner hole portion 22 of the cylindrical housing 12. Thus, the abutment against the stepped surface 49 of the cylindrical housing 12 is configured to restrict the upward movement of the cylindrical rod 14.

  Further, the lower portion of the small diameter portion 66 of the cylindrical rod 14 inserted into the inner hole 20 of the cylindrical housing 12 together with the large diameter portion 64 is positioned in the small diameter inner hole portion 24 of the inner hole 20. The guide bush 46 fixed in the small-diameter inner hole portion 24 is slidably arranged on the inner peripheral surface. In such an arrangement state, the guide balls 54 respectively accommodated in the three guide ball accommodating holes 52 of the guide bush 46 have a small diameter at a half portion where the guide balls 54 are projected and positioned in the small diameter inner hole portion 24. Each of the three guide grooves 68 provided on the outer peripheral surface of the portion 66 is inserted into the lower end portion of the spiral groove portion 70 so as not to move in the axial direction and to be able to roll.

  On the other hand, the clamp bolt 81 inserted into the cylindrical rod 14 is such that the tip portion of the leg 96 positioned in the large diameter portion 64 of the cylindrical rod 14 has a large diameter inner hole portion 22 of the cylindrical housing 12. It is inserted into a cylindrical portion 28 of a female screw portion forming bush 26 fixed therein. The male screw portion 98 provided on the outer peripheral surface of the distal end portion of the leg portion 96 is screwed to the female screw portion 32 formed on the inner peripheral surface of the cylindrical portion 28.

  Thus, in the swing clamp device 10 of this embodiment having such a structure, the head 94 of the clamp bolt 81 protruding upward from the cylindrical rod 14 is rotated in the clockwise direction from the outside. As a result, the male screw portion 98 at the tip of the leg portion 96 of the clamp bolt 81 is tightened against the female screw portion 32 in the cylindrical housing 12, and accordingly, the entire clamp bolt 81 is moved downward. At this time, the cylindrical rod 14 into which the clamp bolt 81 is inserted is formed integrally with the leg portion 96 of the clamp bolt 81 and is moved by the head portion 94 and the outer flange portion 100 that is moved integrally with the leg portion 96. When pressed downward, the entire cylindrical rod 14 is also moved downward. As a result, the protruding portion of the cylindrical rod 14 from the inner hole 20 of the cylindrical housing 12 is retracted and moved into the inner hole 20 of the cylindrical housing 12.

  Further, when the protruding portion of the cylindrical rod 14 is retracted, the three guide grooves 68 provided on the outer peripheral surface of the small diameter portion 66 of the cylindrical rod 14 in the small diameter inner hole portion 24 of the cylindrical housing 12. The guide balls 54 that are incapable of moving in and are respectively allowed to roll are allowed to roll in the respective guide grooves 68 as the cylindrical rod 14 is retracted. At this time, each guide ball 54 first rolls in the spiral groove portion 70 extending in the counterclockwise direction upward in each guide groove 68 and then straightens in the axial direction upward. The inside of the extending linear groove 72 is rolled. Thereby, in the first half stage when the protruding portion of the cylindrical rod 14 is retracted, the protruding portion is rotated in the clockwise direction by an amount corresponding to the length of the spiral groove portion 70, the lead angle, etc. Further, in the latter half stage, it is moved further downward in a straight line in the axial direction by an amount corresponding to the length of the linear groove portion 72. Here, in the first half of the pull-in movement, the length, lead angle, and the like of the spiral groove portion 70 of each guide groove 68 are adjusted so that the protruding portion of the cylindrical rod 14 is rotated by 90 °. . As is clear from this, in this embodiment, the guide groove 68 and the guide ball 54 constitute a rotation mechanism.

  As described above, the head 94 of the clamp bolt 81 protruding upward from the cylindrical rod 14 from the state in which the protruding portion of the cylindrical rod 14 is retracted and moved into the cylindrical housing 12 is Is rotated counterclockwise, the tightening of the male screw portion 98 of the clamp bolt 81 with respect to the female screw portion 32 in the cylindrical housing 12 is loosened, and the clamp bolt 81 is moved upward. At this time, the pressing force applied to the cylindrical rod 14 from the outer flange portion 100 integrally formed with the leg portion 96 of the clamp bolt 81 is eliminated. As a result, the cylindrical rod 14 is pressed upward by the urging force of the compression coil spring 45 in the cylindrical housing 12, and the upper part of the small diameter portion 66 is projected and moved from the cylindrical housing 12. At that time, the guide ball 54 rolls in each guide groove 68, so that the cylindrical rod 14 is first straightened in the axial direction by an amount corresponding to the length of the linear groove portion 72. , And then moved further upward while being rotated by 90 ° counterclockwise.

  Therefore, in the swing clamp device 10 of this embodiment, the head 94 of the clamp bolt 81 is rotated from the outside in the clockwise direction, so that the swing provided in a fixed position on the cylindrical rod 14 is provided. After the arm 80 is rotated 90 ° clockwise together with the cylindrical rod 14 (see FIG. 1), the arm 80 moves straight downward by a dimension corresponding to the length of the linear groove 72 of the guide groove 68. It is configured so that it can be swallowed. Further, when the head 94 of the clamp bolt 81 is rotated counterclockwise from the outside from such a state, the swing arm 80 together with the cylindrical rod 14 is guided upward. After being moved straight by a dimension corresponding to the length of the 68 straight groove portions 72, it is rotated by 90 ° counterclockwise and returned to the state before being moved downward. It is.

  Thus, when a predetermined workpiece is clamped and fixed using the swing clamp device 10 having such a structure, for example, the following operations are performed.

  That is, first, as indicated by a two-dot chain line in FIG. 2, the cylindrical housing 12 is placed so as to be erected on a base 104 such as a table of a machine tool. In this state, a plurality of pins 106 protruding from the base 104 are inserted into a plurality of pin holes 43 provided on the lower end surface of the outer flange portion 30 of the female thread portion forming bush 26. The swing clamp device 10 is fixed to the base 104.

  At this time, the clamp bolt 81 with respect to the female screw portion 32 in the cylindrical housing 12 is positioned so that the outer step surface 60 of the large diameter portion 64 of the cylindrical rod 14 is brought into contact with the step surface 49 of the cylindrical housing 12. The screwing position of the male screw part 98 is adjusted. Thus, the swing arm 80 is positioned at the top dead center of the vertical movement stroke.

  Next, as shown by a two-dot chain line in FIGS. 1 to 3, the workpiece 108 to be clamped is placed on the base 104. The work 108 is placed at a position having a phase difference of 90 ° in the clockwise direction with respect to the swing arm 80 extending in a direction perpendicular to the axis from the cylindrical rod 14.

  Thereafter, the head 94 of the clamp bolt 81 protruding upward from the cylindrical rod 14 is rotated clockwise. At this time, the rotation operation is performed using a known screw tightening device (not shown) such as a pneumatic or electric impact wrench or nutrunner. Further, it is desirable that the rotation amount of the clamp bolt 81 by the automatic rotation operation using such a screw tightening device is always the same rotation amount unless the size of the workpiece 108 is changed. Thereby, the advantage that the clamping force with respect to the workpiece | work 108 is made constant is acquired.

  Thus, by the rotation operation of the clamp bolt 81, as shown in FIGS. 1 and 6, the swing arm 80 is moved downward by an amount corresponding to the rotation amount of the clamp bolt 81, and during the movement. , Rotated 90 ° clockwise. As a result, the swing arm 80 is automatically positioned at the position where the work 108 is disposed, and the work 108 is clamped and fixed between the clamp surface 82 of the swing arm 80 and the upper surface of the base 104. The The clamp state of the workpiece 108 can be easily eliminated by rotating the clamp bolt 81 counterclockwise by an automatic rotation operation using a screw tightening device (not shown) or the like.

  Thus, in the swing clamp device 10 of the present embodiment, the workpiece 108 is clamped using the tightening force of the male screw portion 98 of the clamp bolt 81 against the female screw portion 32 in the cylindrical housing 12. It is supposed to be fixed. Therefore, for example, unlike the conventional apparatus that obtains the clamping force of the workpiece 108 using a pneumatic mechanism, a hydraulic mechanism, or the like, piping, manifolds, couplings, and pumps constituting the pneumatic mechanism or the hydraulic mechanism are used. Such a large and expensive incidental facility is completely unnecessary. Therefore, in such a swing clamp device 10, the cost required for installation can be reduced extremely advantageously by the amount that such incidental equipment is unnecessary.

  Therefore, when the swing clamp device 10 according to the present embodiment is used as described above, even if the workpiece 108 is obtained by small-scale production, the processing cost per piece of the small amount of workpiece 108 can be reduced. Such an increase due to the installation cost or running cost can be suppressed or eliminated very advantageously. As a result, improvement in work efficiency and cost reduction in machining work of the workpiece 108 obtained by small-volume production can be effectively realized.

  In this embodiment, the workpiece 108 can be clamped with a constant clamping force by performing an automatic rotation operation of the clamp bolt 81 with a constant rotation amount using a screw tightening device or the like. As a result, not only can the clamping operation of the workpiece 108 be performed more easily and quickly, but also various adverse effects caused by variations in the clamping force on the workpiece 108 can be reliably prevented and clamped. For example, the machining operation on the workpiece 108 can be performed more stably.

  Furthermore, in the swing clamp device 10 of the present embodiment, the clamp bolt 81 is formed of a copper alloy or the like having a lower hardness than the iron female screw portion forming bush 26 having the female screw portion 32 screwed in the male screw portion 98. In addition, the clamp bolt 81 can be easily replaced by simply attaching and detaching the fixing nut 92 screwed into the upper end portion of the cylindrical rod 14.

  Therefore, in such a swing clamp device 10, when a large load is repeatedly applied between the male screw portion 98 of the clamp bolt 81 and the female screw portion 32 in the cylindrical housing 12 by using a screw tightening device or the like. Even in such a case, the wear amount of the clamp bolt 81 that can be easily replaced is made larger than the wear amount of the internal thread portion 32, and thereby the durability of use of the internal thread portion 32 can be advantageously increased.

  Therefore, according to the swing clamp device 10 of the present embodiment, the service life of the entire device 10 can be advantageously extended by simply replacing the clamp bolt 81 that can be easily replaced at an appropriate time. is there. As a result, a smooth clamping operation can be maintained stably and reliably over a longer period of time.

  In the present embodiment, since the swing arm 80 is also easily exchanged, appropriate maintenance for the swing arm 80 itself or the entire swing clamp device 10 by the exchange of the swing arm 80 can be easily performed.

  Furthermore, in the swing clamp device 10 of the present embodiment, the female screw portion forming bush 26 having the female screw portion 32 into which the male screw portion 98 of the clamp bolt 81 is screwed is configured as a separate member independent of the cylindrical housing 12. The cylindrical housing 12 is fixed. Therefore, for example, even when the female thread portion 32 is worn and needs to be replaced, only the female thread portion forming bush 26 can be replaced. Therefore, the excellent usability can be stably maintained over a long period of time simply by replacing the female thread portion forming bush 26.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, the structure for fixing the cylindrical housing 12 to the base 104, the structure for fixing the swing arm 80 to the cylindrical rod 14, and the structure for attaching the clamp bolt 81 to the cylindrical rod 14 are those described in the above embodiment. There is no limitation.

  A clamp bolt 81 as a male screw member is screwed into a female screw portion 32 provided in the cylindrical housing 12, and the cylindrical rod 14 is pressed by tightening the female screw portion 32, so that the protruding portion is Any structure other than the illustrated structure may be used as long as it is retracted and moved into the cylindrical housing 12.

  Further, the female screw portion 32 to which the male screw portion 32 of the clamp bolt 81 that is a male screw member is screwed may be formed directly on the inner peripheral surface of the cylindrical housing 12, for example.

  Furthermore, in the above-described embodiment, part of the linear motion of the cylindrical rod 14 when the cylindrical rod 14 is retracted and moved into the cylindrical housing 12 is converted into rotational motion, and the cylindrical shape of the cylindrical rod 14 is changed. The rotation mechanism that rotates the cylindrical rod 14 in accordance with the retraction movement into the housing 12 is constituted by the guide groove 68 and the guide ball 54. The structure of this rotation mechanism is also a conventionally known structure. Can be employed as appropriate. That is, for example, the guide groove 68 is formed on one of the outer peripheral surface of the cylindrical rod 14 and the inner peripheral surface of the cylindrical housing 12, while the guide groove 68 is formed on either one of them. A sliding pin that can be slid may be integrally projected instead of the guide ball 54.

  Further, as an urging means for applying an urging force to the cylindrical rod 14 in a direction opposite to the moving direction when the cylindrical rod 14 is retracted into the cylindrical housing 12, an exemplary compression coil spring is used. In addition to 45, known urging means can be appropriately employed.

  In addition, in the above-described embodiment, a specific example of applying the present invention to a swing clamp device for clamping a workpiece and fixing it to a base has been shown. Needless to say, the present invention can be advantageously applied to any swing clamp device that clamps an article other than a workpiece such as a workpiece and fixes it to a base.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is upper surface explanatory drawing which shows an example of the swing clamp apparatus according to this invention. It is II-II sectional explanatory drawing in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. It is IV-IV sectional explanatory drawing in FIG. It is explanatory drawing which expand | deploys and shows a part of outer peripheral surface of the cylindrical rod with which the swing clamp apparatus shown by FIG. 1 is equipped. It is explanatory drawing which shows an example of the use condition of the swing clamp apparatus shown by FIG. 1, Comprising: The state which clamped the workpiece | work between the swing arm and the base is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Swing clamp apparatus 12 Cylindrical housing 14 Cylindrical rod 26 Female thread part formation bush 32 Female thread part 45 Compression coil spring 54 Guide ball 68 Guide groove 70 Spiral groove part 72 Linear groove part 78 Fitting part 80 Swing arm 81 Clamp bolt 92 Fixing nut 98 Male thread part 100 Outer flange part 102 Engagement part 104 Base 108 Workpiece

Claims (6)

A cylindrical housing that is erected and fixed on a predetermined base;
An internal thread portion provided in a fixed position inside the cylindrical housing;
A part of the projecting part from the inside of the cylindrical housing can be drawn and moved into the cylindrical housing in a state where the part on one side in the axial direction protrudes outside in the cylindrical housing. A cylindrical rod inserted like
An urging means for applying an urging force to the cylindrical rod in a direction opposite to the moving direction when the cylindrical rod is retracted and moved into the cylindrical housing;
A swing arm provided in a fixed position in a state of extending in a direction perpendicular to the axis with respect to the protruding portion of the cylindrical rod from the cylindrical housing,
The cylindrical rod is inserted into the cylindrical rod in a state of being rotatably inserted into the cylindrical rod, and a portion on the distal end side in the insertion direction into the cylindrical rod protrudes into the cylindrical housing. And is arranged so as to be movable in the pull-in movement direction, and with the movement in the pull-in direction, a pressing portion that presses the cylindrical rod in the pull-in direction, and the tip side that enters the cylindrical housing A male threaded portion that is provided in a portion and is screwed with the female threaded portion in the cylindrical housing, and is moved in the retracting direction as the male threaded portion is tightened to the female threaded portion. A male screw member that presses the cylindrical rod at the pressing portion and retracts and moves the cylindrical rod into the cylindrical housing against the urging force of the urging member;
Provided between the cylindrical housing and the cylindrical rod, and converts a part of the linear motion of the cylindrical rod into a rotational motion when the cylindrical rod is retracted and moved into the cylindrical housing. A rotating mechanism for rotating the cylindrical rod as the cylindrical rod is retracted into the cylindrical housing;
And moving the male screw member and rotating the cylindrical rod while rotating the cylindrical rod, and moving the male rod member into the cylindrical housing, thereby moving the swing arm on the base. A swing clamp device characterized in that it is rotated and positioned to an arrangement position of an article, and further, the article is clamped between the swing arm and the base.   The male screw member has a head exposed to the outside at the tip of the protruding portion of the cylindrical rod from the cylindrical housing, and the male screw portion is formed on the outer peripheral surface. A leg that is rotatably inserted into the cylindrical housing and is positioned so as to be in contact with the distal end surface of the protruding portion of the cylindrical rod while being integrally movable with the head. The swing clamp device according to claim 1, wherein the swing clamp device is configured by a bolt member having the flange-shaped pressing portion.   The male screw member is removably inserted into the cylindrical rod through the opening on the tip side of the protruding portion of the cylindrical rod from the cylindrical housing, while the protruding portion of the cylindrical rod is A male threaded portion is formed on the outer peripheral surface on the front end side, and a nut member is screwed to the male threaded portion, and further, the nut of the cylindrical rod in the pressing portion of the male threaded member is The swing clamp device according to claim 2, wherein an engaging portion that engages with a surface opposite to the contact side with the tip surface of the protruding portion is integrally formed.   One of the protruding portions of the cylindrical rod is provided with a fitting portion having a tapered surface gradually increasing in diameter toward the cylindrical housing at a portion closer to the cylindrical housing than a portion where the male screw portion is formed. The swing arm comprises a through-hole provided with a tapered surface on the inner side corresponding to the tapered surface of the fitting portion of the cylindrical rod, and is made of an independent member separate from the cylindrical rod. An arm is extrapolated to the protruding portion of the cylindrical rod in the through hole, and is taper-fitted to the fitting portion of the protruding portion, and the male screw portion of the cylindrical rod is The swing according to claim 3, wherein a nut member comes into contact with the swing arm and is screwed together so that the swing arm is provided in a fixed position with respect to the protruding portion of the cylindrical rod. Lamp device.   5. The device according to claim 1, wherein the male screw member is formed of a metal material having a smaller hardness than a metal material forming the female screw portion provided in the cylindrical housing. The swing clamp device described. The female thread portion is provided on an inner peripheral surface of a cylindrical body that is separate from the cylindrical housing and can be inserted into the cylindrical housing, and the cylindrical body is inserted into the cylindrical housing. The swing clamp according to any one of claims 1 to 5, wherein the female screw portion is provided in a fixed position inside the cylindrical housing by being detachably fixed. apparatus.

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