JP2009133363A - Clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that an exclusive-use clamp is required for a non-adaptable mounted component different in thickness. <P>SOLUTION: The lower end of an adjusting bolt 3 passing through the base end of a clamp body 1 arranged on the upper side of a bolster A is threaded into a bolt hole 2 on the side of the bolster A. To the upper end of the adjusting bolt 3 being protruded from the upper face of the clamp body 1, a camshaft 4 is pivoted which is formed at the lower end of a grip lever 5. After the adjusting bolt 3 is moved up/down relative to the bolster A with the positive/reverse rotation of the adjusting bolt 3 for temporary fastening, the grip lever 5 is turned down and the clamp body 1 is thrust down by a cam portion 4 for final fastening. Thus, the mounted component W is fastened and fixed onto the bolster A in the state that the clamp body 1 and the mounted component W are in close contact with the upper face of the mounted component and with the upper face of the bolster A, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clamp that is used to fasten and fix a mounted part such as a mold or a jig to a bolster of a machine tool or the like.

  Conventionally, as such a clamp, a locking portion for a dovetail groove of a bolster is integrally formed at the lower end of a rod penetrating the substrate, and the tip of the first link is a cam that abuts the substrate at the tip of the rod. The cam side is pivotally connected to a support shaft, one end of the second link is pivotally attached to the support provided on the substrate by the support shaft, and an intermediate point of the grip lever is attached to the tip of the second link. The grip lever is connected to the other end of the first link with a shaft, and a stopper for restricting the rotation is provided on the second link. In the dovetail groove, insert the rod into the notch of the mounted part such as the lower die from the side, set the board, and push down the grip lever to rotate the first link around its support shaft Then the rod is pulled up and the rod The locking part hits the ridge of the dovetail groove, and a tightening force is generated between the locking part of the rod and the board, so that the mounted part is fastened and fixed to the bolster. Simply push down the grip lever. It can be tightened and does not require a spring to keep it in that state, and it has a compact configuration that does not use hydraulic pressure or compressed air, making it easy to attach and detach, maintain a good working environment, There can be seen a clamp that can be manufactured at a low cost with a simple configuration and can reduce capital investment (for example, see Patent Document 1).

Japanese Utility Model Publication No. 7-6553 (abstract, claim 1, FIGS. 1-2)

However, the above-described prior art has a problem that must be solved as follows.
(1) Since the support column on which the grip lever is pivotably mounted is located at a portion of the substrate that protrudes from the outer peripheral portion of the mounted component away from the cam contact point, when the grip lever is tilted, The rod end is easy to lift.
(2) With the grip lever fully pushed down, the stopper of the second link stops the first link slightly before the upright state, and the second link receives the rotational force on the stopper side and is tightened. Therefore, it is impossible to cope with mounted parts having different thicknesses, and a dedicated clamper is required for each mounted part.
(3) Even if the grip lever can be maintained even if it is not completely pushed down, the grip lever will be almost upright if the mounted parts to be installed are thick, which may hinder processing operations. Absent.

  In view of the above problems (1) to (3), the present invention provides a bolt hole on the bolster side that has a lower end portion of an adjustment bolt penetrating the proximal end side of the clamp body disposed above the bolster. Screw in to form an insertion space for the mounted parts between the tip of the clamp body and the top surface of the bolster, and form at the upper end of the adjustment bolt that protrudes from the upper surface of the clamp body and at the lower end of the grip lever. The above-mentioned insertion space can be adjusted by the amount of screwing the adjustment bolt into the bolt hole, and the clamp that presses the clamp body downward when the cam part is tilted is attached to the clamp body. By positioning and tightening the outer peripheral part of the mounted part between the tip part and the upper surface of the bolster, the adjusting bolt is positioned outside the outer peripheral part of the mounted part, and the grip lever By arranging it directly above the adjustment bolt, the above-mentioned problem (1) can be solved, and the adjustment bolt can be moved up and down relative to the bolster by forward and reverse rotation of the adjustment bolt so that the insertion space can be expanded and contracted. The clamp body is pushed downward by the cam portion and the clamp body is brought into close contact with the upper surface of the attached component, and the attached component is brought into close contact with the upper surface of the bolster, thereby solving the problems (2) and (3). Resolve.

In short, in the present invention, the lower end portion of the adjustment bolt that penetrates the proximal end side of the clamp body disposed above the bolster is screwed into the bolt hole on the bolster side, and the gap between the distal end portion of the clamp body and the upper surface of the bolster. Form the insertion space for the parts to be mounted, and attach the cam part formed on the lower end of the grip lever to the upper end of the adjustment bolt protruding from the upper surface of the clamp body, and screw it into the bolt hole of the adjustment bolt The above-mentioned insertion space can be adjusted according to the amount, and the clamp body is pressed downward when the cam part is tilted, so only the temporary tightening work by rotating the adjusting bolt with the grip lever and the final tightening work by tilting the grip lever. With this, you can easily attach the mounted part to the bolster, and if the thickness of the mounted part is within the set range, tilt the grip lever approximately 90 degrees. For allowing attaching can, to correspond to a plurality of types of the attachment part of the thickness, and machining operations can be set so as not hindrance to.
In addition, since the bolt hole is formed on the upper surface of the mounting part provided on the bolster side, it can be mounted without forming the bolt hole directly on the bolster, and the mounting part is detachable from the dovetail formed on the bolster. Since it is slidably mounted, it can be easily set on an existing machine tool having a dovetail.

The mounting portion is provided with a cylindrical guide convex portion protruding from the upper surface of the bolster, and a guide concave portion into which the guide protruding portion is slidably fitted is formed near the base end side of the lower surface of the clamp body. The clamp body moves smoothly up and down with respect to the part, and the clamp body does not wobble with respect to the guide convex part, so that the tip side of the clamp body does not lift up when tightening, and can be securely tightened.
Furthermore, because the guide recess is the internal space of the guide tube that is integrally projected near the base end of the lower surface of the clamp body, the guide recess can be formed deeply even if the clamp body is thinned. The range of the thickness of the parts can be set widely, and the practical effect is significant.

Hereinafter, embodiments of a clamp according to the present invention will be described with reference to the drawings.
1, 2 and 5 are a perspective view of a clamp according to the present invention, a sectional view taken along line XX of FIG. 1, and an exploded perspective view. Such a clamp is mainly disposed above the upper surface of the bolster A. The clamp body 1 provided, the adjustment bolt 3 loosely threaded through the clamp body 1 and screwed into the bolt hole 2 formed at the lower end side on the bolster A side, and the adjustment bolt 3 protruding from the upper surface of the clamp body 1 And a grip lever 5 having a cam portion 4 pivotally attached to the upper end of the bolster A, and an attachment to be formed between the upper surface of the bolster A and the tip of the clamp body 1 by the screwing amount of the adjustment bolt 3 into the bolt hole 2 The insertion space H of the part W can be adjusted, and the clamp body 1 is pressed downward by raising or lowering the grip lever 5 and rotating the cam part 4 so that the clamp body 1 adheres to the upper surface of the mounted part W. Trying to let

  In the clamp body 1, as shown in FIG. 5, the insertion hole 7 of the adjustment bolt 3 is provided near the base end side of the horizontally long main material 6, and the contact protrusion 8 is provided on the lower surface of the distal end. The clamp main body 1 is vertically projecting and can be moved up and down with respect to the adjustment bolt 3.

In the adjusting bolt 3, as shown in FIG. 5, an upright plate-like hinge plate 10 is integrally formed at the upper end of the bolt body 9, and a horizontal pin insertion hole 11 is inserted in the center of the side surface of the hinge plate 10. The bolt body 9 is interposed between the hinge plate 10 and the upper surface of the clamp body 1 with a washer 12 in a penetrating state.
Further, a compression spring 13 is provided between the clamp body 1 and the bolster A side, and an adjustment bolt 3 passes through the compression spring 13, and the clamp body 1 is biased upward by the compression spring 13 through a washer 12. Since the hinge plate 10 is pressed upward, even if the hand is released from the clamp body 1, it does not move down as it is.

In the grip lever 5, a round bar-shaped lever body 14 is integrally formed on the upper surface of the cam portion 4. In the cam portion 4, the lower surface has a circumferential surface as shown in FIG. 5. The cam surface 15 is pivotally mounted on the adjusting bolt 3 at an eccentric position with the arc center 15a of the cam surface 15, and the rotation center 4a of the cam portion 4 is from the arc center 15a of the cam surface 15 as shown in FIG. Near the lower end, as shown in FIG. 11, the lowest point of the cam surface 15 gradually moves downward as the cam portion 4 rotates. The cam portion 4 is symmetrical with respect to the center line passing through the arc center of the cam surface 15 and the rotation center of the cam portion 4.
Specifically, as shown in FIG. 5, a notch 16 into which the hinge plate 10 is inserted is formed at the lower center of the cam portion 4, and cam pieces 17, 17a are formed on both sides thereof, and the cam pieces 17, 17a are formed. Pin insertion holes 18, 18 a are formed, and pins 19 are inserted into the pin insertion holes 18, 18 a and the pin insertion holes 11 of the hinge plate 10 in the adjustment bolt 3 inserted into the notches 16. Bolts 21 and 21a are screwed into both end faces of the pin 19 through washers 20 and 20a, and the cam portion 4 is rotatably attached to the adjustment bolt 3 so that the clamp body 1 can be raised and lowered freely. is doing.

  The bolt hole 2 is formed on the upper surface of an attachment portion 22 provided on the bolster A side, and the attachment portion 22 is detachably attached to the bolster A as shown in FIGS. As shown in the figure, the dovetail B formed on the upper surface of the bolster A is integrally formed on the upper surface of the bolster A. Is mounted so as to be slidable and engageable with the stepped portions C and Ca of the dovetail groove B at the time of tightening.

Both the detachable or fixed attachment portions 22 have a cylindrical guide convex portion 23 that protrudes upward from the upper surface of the bolster A, the bolt hole 2 is formed in the center of the upper surface of the guide convex portion 23, and A guide concave portion 24 into which the guide convex portion 23 is slidably fitted is formed near the base end side of the lower surface of the clamp body 1, and the guide concave portion 24 and the insertion hole 7 of the adjusting bolt 3 are arranged and formed on a coaxial line. ing.
2, 3 and 5, the guide recess 24 is an internal space of a guide tube portion 25 integrally formed near the base end side of the lower surface of the main material 6 in the clamp body 1. The concave portion 24 is formed so as to bite into the main material 6 side so that the depth thereof is deeper than the height of the guide tube portion 25. Then, the upper end of the compression spring 13 is brought into contact with the upper bottom surface of the guide recess 24 and the lower end thereof is brought into contact with the bottom surface of the spring seat 26 pressed against the upper surface of the guide projection 23, thereby preventing the clamp body 1 from moving downward and mounting process. The insertion space H is maintained.

  The detachable attachment portion 22 has the guide protrusion 23 integrally formed at the center of the upper surface of an inverted T-shaped slide body 27 accommodated in a dovetail B formed on the upper surface of the bolster A. The guide convex portion 23 is integrally formed at the center of the upper surface of the disc-shaped flange portion 28 which is integrally formed at the center of the upper surface of the slide body 27 and has a diameter larger than the upper opening width of the dovetail groove B.

Next, the operation of the clamp according to the present invention will be described.
When the mounting portion 22 is inserted into the dovetail B of the bolster A, both side portions of the flange portion 28 are grounded to both sides of the dovetail B on the upper surface of the bolster A, and the outer peripheral portion of the mounted part W is located below the tip of the clamp body 1. As shown in FIG. 4 (a), the mounting portion 22 is slid and the grip lever 5 in an upright state is operated so as to rotate the adjusting bolt 3, so that the contact protrusion 8 of the clamp body 1 is covered. After making it contact | abut to the upper surface of the outer peripheral part of the attachment component W, or making it the state slightly separated, as shown in FIG.4 (b), the grip lever 5 is tilted and the contact protrusion 8 is outer periphery of the attachment component W The mounting part 22 is brought into close contact with the step C and Ca of the dovetail B and the outer peripheral part of the mounted part W is clamped between the clamp body 1 and the bolster A to the bolster A. The mounted part W is fixed.
Further, as shown by the solid line in FIG. 6, the grip lever 5 does not have to be parallel to the dovetail B. The grip lever 5 is at a position where the grip lever 5 can be tilted to about 90 degrees and the mounted component W 6 may be a position as shown by a one-dot chain line in FIG. 6, for example, and the adjustment bolt 3 is further rotated by the tilted grip lever 5 to complete the position. It is also possible to tighten it.
Since the tilt angle when the grip lever 5 is tightened differs depending on the screwing amount of the adjustment bolt 3 into the bolt hole 2, that is, the rotation amount of the adjustment bolt 3, the adjustment bolt After the adjustment bolt 3 is slightly rotated in the reverse direction so as to slightly move 3, if the grip lever 5 is tilted again, the grip lever 5 falls from the previous state.

  In the contact process of the contact protrusion 8 in the clamp body 1 to the outer peripheral portion of the mounted part W, first, the grip lever 5 in the upright state shown by the solid line in FIG. 8 and FIG. As the position of the lowermost surface of the cam part 4 on the lower end side of the grip lever 5 gradually moves downward in the process of making the tilted state shown by the chain line, the clamp body 1 is gradually pressed downward to come into contact. The protrusion 8 is gradually moved upward on the upper surface of the part W to be attached, and the slide body 27 of the attachment part 22 is completely brought into close contact with the step parts C and Ca of the dovetail B, respectively.

  Since the guide recess 24 on the clamp body 1 side is slidably inserted into the guide protrusion 23 on the bolster A side, the clamp body 1 can be smoothly moved when adjusting the position with the adjusting bolt 3 and tightening with the grip lever 5. Move up and down.

  Since both side portions of the flange portion 28 in the mounting portion 22 are grounded to both side portions of the dovetail B on the upper surface of the bolster A, the slide body 27 which is a lower portion of the mounting portion 22 is suspended in the dovetail B. And is not dropped down to the bottom of the dovetail B, and the sliding operation is smooth.

It is a perspective view of the clamp concerning the present invention. It is XX sectional drawing of FIG. It is sectional drawing of the clamp which moved the clamp main body from the state of FIG. It is a principal part enlarged view of the state which rotated the adjustment bolt 90 degree | times from the state of FIG. It is a principal part enlarged view of the state which fell the cam part from the state of FIG. It is a disassembled perspective view of the clamp of FIG. It is a principal part enlarged view of the top view which shows the attachment state in the clamp | tightening state of the clamp of FIG. It is a principal part enlarged view of the YY cross section of FIG. It is a front view which shows the attachment state of the clamp of the loosened state. It is a front view which shows the attachment state of the clamp | tightening state clamp. It is an enlarged front view of the cam part in a grip lever. It is a front view explaining the difference of the state of the cam part in the loosened state and clamped state of a clamp. It is a perspective view of a fixed clamp.

Explanation of symbols

1 Clamp body 2 Bolt hole 3 Adjustment bolt 4 Cam part 5 Grip lever
22 Mounting part
23 Guide protrusion
24 Guide recess
25 Guide cylinder A Bolster B Dovetail H Insertion space W Mounted parts

Claims (5)

  A clamp for fixing a part to be attached to a bolster in a machine tool, wherein a lower end portion of an adjustment bolt that penetrates a proximal end side of a clamp body disposed above the bolster is screwed into a bolt hole on a bolster side. An insertion space for the mounted part is formed between the tip part of the clamp body and the upper surface of the bolster, and a cam part formed at the lower end part of the grip lever is formed at the upper end part of the adjustment bolt protruding from the upper surface of the clamp body. A clamp characterized in that the insertion space can be adjusted according to the amount of screwing the adjustment bolt into the bolt hole, and the clamp body is pressed downward when the cam portion is tilted.   2. The clamp according to claim 1, wherein the bolt hole is formed on the upper surface of the mounting portion provided on the bolster side.   The clamp according to claim 2, wherein the attachment portion is detachably and slidably attached to a dovetail formed in the bolster.   The mounting portion is provided with a cylindrical guide protrusion protruding from the upper surface of the bolster, and a guide recess into which the guide protrusion is slidably fitted is formed near the base end side of the lower surface of the clamp body. The clamp according to claim 2 or 3.   The clamp according to claim 4, wherein the guide recess is an internal space of a guide tube portion integrally projecting toward the base end side of the lower surface of the clamp body.

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