JP2015110465A - Width adjustment jig for hanging clamp - Google Patents

Abstract

A width adjusting jig for a suspension clamp capable of firmly holding and fixing a transported object corresponding to a transported object in a wide range of dimensions.
A suspension clamp in which a pair of arc-shaped arms 23, each end of which is pivotally supported around a rotation shaft 33, is rotated and brought close to each other to support a transported object B1 on a support portion inside the arc. There are 20 width adjustment jigs 1. The support portion 24a is detachably provided to provide a curved surface protruding toward the inner side of the arc.
[Selection] Figure 5

Description

  The present invention relates to a jig in a clamp for holding and lifting a heavy load such as a steel material, and more particularly to a width adjusting jig for a hanging clamp for adjusting a holding width corresponding to the size of the load.

  Suspension clamps are used for lifting and transporting work that lifts a heavy transporter that does not have a gripping part and transports it with a crane or a forklift. In particular, in one type of suspension clamp for transporting a rod-shaped heavy load, one end of a pair of arc-shaped arms is rotatably supported and the arcs are opposed to each other. There are known suspension clamps that can be moved. While turning the pair of arms, the width between them is changed, and the rod-shaped transported object is sandwiched and clamped by wrapping it from the side inside the arc. A transported object fixed to the suspension clamp is transported by being attached to a transport mechanism such as a crane via the suspension clamp. Such a heavy load carrying suspension clamp requires a strong clamping / fixing mechanism that prevents the carried article from falling.

  For example, in Patent Document 1, as such a suspension clamp, a lower link in which ends of a pair of arc-shaped arms for holding and fixing a transported object are extended outward, and the lower link A lifting rod for carrying a round bar having an upper link combined to change the width of the extended end according to the lever principle is disclosed. The lower link and the upper link constitute a four-joint link mechanism such as a pantograph, and when the upper link is lifted by a crane, the width of the upper links is reduced by the weight of the arm, thereby reducing the width of the lower links. It turns to become. The arcuate arms of the lower link try to come close to each other by the “lever principle”, and the support portions provided at the lower left and right and upper left and right sides of the arm firmly support the round bars and securely hold them. . When the width of the upper link is fixed by the lock lever fixed by the connecting pin, the round bar can be firmly fixed between the arc-shaped arms and can be lifted and transported together with the suspension clamp attached to the crane.

  By the way, when trying to hold and fix a transported object between a pair of arc-shaped arms of a suspension clamp, the transport is smaller in cross-sectional dimension than the width (gap) formed between the arms in a completely closed state. You can't pinch this with things. Moreover, in the case of a transported object having such a large cross-sectional dimension that the transported object cannot be clamped unless the arms are too open, it cannot be fixed. In addition, as in Patent Document 1, in a hanging clamp that attaches a plate-like support portion to the inside of an arm and suppresses blurring in the axial direction of the conveyed item, the conveyed item is positioned between the arms in a predetermined manner. If the cross-sectional dimensions are not such that the support portion can be contacted accurately, it cannot be stably clamped and fixed. That is, the cross-sectional dimension of the transportable object that can be held and fixed can be different depending on the position, shape, and size of the support portion.

  Therefore, several types of suspension clamps have been prepared in advance, with different widths (gap), arm lengths, support part positions, etc. that can be clamped by changing the width (gap) when the arms are completely closed. It is appropriately selected according to the size of the object.

Japanese Utility Model Publication No. 7-12380

  On the other hand, in lifting and transporting a transported object, carrying a heavy lifting clamp to a work site with a crane or the like every time the size of the transported object is reduced causes a reduction in work efficiency. Therefore, there has been a demand for a suspension clamp capable of firmly holding and fixing the transported object corresponding to a transported object in a wide range of dimensions, but a cost for renewing the hanging clamp is required. Therefore, a jig that can be attached to an existing hanging clamp has been demanded.

  The present invention has been made in view of the situation as described above. The object of the present invention is for a suspension clamp that can firmly hold and fix a transported object corresponding to a transported object in a wide range of dimensions. It is to provide a width adjusting jig.

  The width adjusting jig for a suspension clamp according to the present invention is configured to bring a pair of arc-shaped arms, each end of which is pivotally supported around a rotation axis, to rotate and approach each other, and to carry a transported item to a support portion inside the arc. A width adjustment jig for a suspension clamp for point support, wherein the jig is detachably provided to the support portion to provide a curved surface protruding toward the inside of the arc.

  According to this invention, since the curved surface protrudes toward the inside of the arc of the arm by attaching the width adjusting jig to the support portion, it is possible to firmly support the transported object over a wide range of the curved surface. That is, the width adjustment jig can firmly hold and fix a transported object having a smaller cross-sectional dimension, and as a result, the transported object can be firmly held and fixed corresponding to a transported object in a wide range of dimensions.

  In the above-described invention, the curved surface is provided by a pair of round tubes provided with a tension spring, and a pair of the round tubes is formed by inserting a square member into a square tube provided along the axis of the round tube. The arm may be arranged inside the arc, and the pulling spring may be routed outside the arc of the arm and fixed to the support portion. According to this invention, the width adjusting jig can be freely attached and detached, and the curved surface of the round tube can protrude toward the inside of the arc. That is, while having a simple configuration, it is possible to firmly hold and fix the transported object corresponding to the transported object in a wide range of dimensions.

  In the above-described invention, the square bar may be fixed to the support portion inside the arc of the arm. According to this invention, the width adjusting jig can be easily attached by the square material fixed to the support portion, and more robust point support of the transported object is enabled. As a result, the transported object can be pinched and fixed more firmly in correspondence with a transported object in a wide range of dimensions.

  In the above-described invention, the round tube may be fixed with the axis line being offset from the longitudinal center line of the square bar. According to this invention, it is possible to change the range of the cross-sectional dimension of the transportable object that can be firmly sandwiched and fixed by changing the direction of the width adjusting jig, and can handle the transported object in a wider range of dimensions. .

It is a perspective view of the width adjustment jig by this invention. It is a front view of the principal part of a width adjustment jig. It is (a) front view and (b) side view of a suspension clamp using a width adjusting jig. It is the (a) front view and (b) side view of the principal part of the suspension clamp which fixed the width adjusting jig. It is a front view of the suspension clamp which fixed the width adjusting jig. It is a front view of the suspension clamp which fixed the width adjustment jig in a different direction.

  First, a width adjusting jig according to one embodiment of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the width adjusting jig 1 includes a pair of jig bodies 10 and a tension spring 11 that connects the jig bodies 10 to each other. The jig body 10 is fixed to the round tube portion 2 which is a substantially cylindrical tube, the flat plate member 3 whose main surface is fixed to the outer peripheral surface of the round tube portion 2, and the round tube portion 2 of the flat plate member 3. A gate-shaped member 4 having a gate-shaped cross section fixed to the main surface opposite to the main surface, and an eyebolt-shaped annular portion 5 fixed to the gate-shaped member 4. Each of the round tube portion 2 and the flat plate member 3, the flat plate member 3 and the portal member 4, and the portal member 4 and the annular portion 5 are fixed by welding, for example. The annular portion 5 is connected to both ends of the tension spring 11, thereby connecting the jig bodies 10 to each other.

  Referring also to FIG. 2, the portal member 4 and the flat plate member 3 form a square tube portion 9 having a substantially rectangular tube shape. At this time, the axis C <b> 2 that is the axis of symmetry of the internal space of the square tube portion 9 is parallel to the axis C <b> 1 that is the center line of the internal space of the round tube portion 2. Further, the axis C <b> 1 and the axis C <b> 2 are offset by a width W in a direction parallel to the main surface of the flat plate member 3. As will be described later, the square plate 9 is inserted with a holding plate 24a (see FIG. 3), which is a square member, and fitted into the inner space thereof, so that the center line in the longitudinal direction of the holding plate 24a overlaps the axis C2. That is, the axis C1 is also offset with respect to the center line in the longitudinal direction of the pressing plate 24a. In addition, the square tube part 9 can insert the holding plate 24a from either of the openings on both sides, and can reverse the jig body 10 as described later.

  Next, the suspension clamp for attaching and detaching the width adjusting jig 1 will be described in detail with reference to FIG.

  As shown in FIG. 3, the clamp 20 that is a suspension clamp includes a suspension ring 25 that is connected to a crane or the like, a pair of upper links 21 that are rotatably attached to a lower end thereof by a shaft body 31, and the upper links 21. And a pair of lower links 22 rotatably attached by a pair of shaft bodies 32. The lower links 22 are pivotally supported by shafts 33 at their lower ends, and together with the upper links 21 constitute a four-node substantially rhombus (pantograph-shaped) link mechanism such as a pantograph.

  At the lower end of the lower link 22, a pair of arc-shaped arms 23 that are integrally formed by extending the lower links 22 downward are provided, and the inner sides of the arcs are opposed to each other. Each of the upper part and the lower part inside the arc of the arm 23 is provided with a pair of pressing plates 24a and 24b which are flat square members. The holding plates 24 a and 24 b have their main surfaces normal to a direction perpendicular to the tangent line of the arc of the arm 23, and are attached to the outer surface of the round bar B as a rod-shaped transported object sandwiched inside the arm 23. The main surface can be brought into contact. That is, the holding plates 24 a and 24 b are provided on the support portion that supports the round bar B on the arm 23.

  Note that one end of the shaft body 32 pivotally supports one end of the lock lever 26, and the other end of the shaft body 32 is slidably inserted into the long hole 27 on the other end side of the lock lever 26. In the long hole 27, a groove portion 27 a for engaging the shaft body 32 is provided at an end portion on the other end side of the lock lever 26.

  Next, a method for attaching the width adjusting jig 1 to the clamp 20 will be described in detail with reference to FIG.

  As shown in FIG. 4, on one side of the arm 23, both end portions of the upper holding plate 24 a are inserted into the square tube portions 9 of the pair of jig main bodies 10, and the tension spring 11 is placed outside the arc of the arm 23. Draw around. The tension spring 11 allows the width adjusting jig 1 to be attached and detached while preventing the jig body 10 from falling off the inserted holding plate 24a. Further, each of the jig bodies 10 can be fixed to the arm 23 by pressing the flat plate member 3 against the holding plate 24 a by the pull spring 11. The fixed jig main body 10 positions the round tube portion 2 on the inner side of the arc of the arm 23, and projects the curved surface, which is the outer peripheral surface of the round tube portion 2, toward the inner side of the arc. At this time, each jig body 10 is fixed in accordance with the offset direction of the axis C <b> 1 of the round tube portion 2. Thereby, each axis C1 of a pair of jig main body 10 is piled up, and the outer peripheral surface of the round tube part 2 is aligned with the outer surface of a rod-shaped transported object such as a round bar B1 described later. Here, a case is shown in which the jig body 10 is fixed in such a direction that the axis C1 of the round tube portion 2 is positioned closer to the shaft body 33 that is the rotation shaft of the arm 23 than the axis C2 of the square tube portion 9. Similarly, the width adjusting jig 1 is fixed to the other arm 23.

  Next, operation | movement of the clamp 20 is demonstrated in detail using FIG.5 and FIG.6.

  As shown in FIG. 5A, the clamp 20 has a suspension ring 25 connected to a crane or the like, and rotates the upper link 21 and the lower link 22 by grounding the tip of the arm 23, etc. Separate each other to the unlocked position. Then, the shaft body 32 engages with the groove portion 27a (see FIG. 3) in the long hole 27 of the lock lever 26. That is, the lock is released. Thereby, even if the clamp 20 is lifted by a crane or the like, the arms 23 are held in the open lock position while being separated from each other. Subsequently, each arm 23 is positioned so as to sandwich, for example, the outer surface of the round bar B1 as a transported object, and the lock lever 26 is operated to release the engagement between the shaft body 32 and the groove 27a. Here, when the clamp 20 is lifted by the suspension ring 25, the lower link 22 rotates so that the arms 23 are brought close to each other.

  Then, as shown in FIG. 5B, the arms 23 come close to each other and sandwich the round bar B1 inside the arc. The round bar B1 has the holding plate 24b in contact with the lower side of the outer surface thereof from the left and right, and the outer peripheral surface of the round tube portion 2 of the jig body 10 is in contact with the upper side thereof from the left and right. That is, the round bar B1 is point-supported at a total of four locations including the lower two locations and the upper two locations. Since the flat plate member 3 of the jig body 10 is supported by the pressing plate 24a, the round tube portion 2 can be firmly supported and the round bar B1 can be firmly point-supported. Therefore, it is possible to firmly clamp and fix the round bar B1 as a transported object by the clamp 20 to which the width adjusting jig 1 is fixed.

  By the way, in above-mentioned FIG.5 (b), the arm 23 is completely closed and the state which adjoined most is shown. That is, in the case where the jig body 10 of the width adjusting jig 1 is fixed in the above-described direction, the case where the round bar B1 having the minimum cross-sectional dimension that can be firmly clamped and fixed is clamped is shown. At this time, if the width adjusting jig 1 is removed, the arms 23 cannot be brought closer to each other, so that the upper two places cannot be supported. That is, without the width adjusting jig 1, the round bar B1 cannot be clamped and fixed. In other words, the round bar having a smaller cross-sectional dimension can be firmly clamped and fixed by the clamp 20 by the width adjusting jig 1. In particular, the width adjusting jig 1 projects the curved surface of the outer peripheral surface of the round tube portion 2 toward the inside of the arc of the arm 23. It is possible to support. That is, it is possible to firmly support a transported object in a wide dimensional range with the width adjusting jig. As a result, the clamp 20 can firmly hold and fix the clamp 20 corresponding to a transported object in a wider dimensional range including the case where the width adjusting jig is not used.

  Moreover, as shown in FIG. 6, the direction of the jig body 10 can be changed. That is, the jig body 10 is inverted so that the offset axis C1 (see FIG. 2) is positioned on the side away from the shaft 33 that is the rotation axis of the arm 23 with respect to the axis C2 of the square tube portion 9. And fix. Then, the outer peripheral surface of the round tube portion 2 moves downward in accordance with the offset of the axis C1 with respect to the axis C2 which is also the symmetric line of reversal compared to before the jig body 10 is inverted (see FIG. 5B). The round bar B2 having a smaller cross-sectional dimension than the round bar B1 can be firmly sandwiched and fixed. That is, by offsetting the axis C1 of the round tube portion 2 from the axis C2 of the square tube portion 9, the jig body 10 is inverted to change the range of the cross-sectional dimension of the transportable object that can be firmly clamped and fixed. be able to. As a result, the clamp 20 can accommodate a wider range of objects.

  For example, when a width adjusting jig is not used, a clamp (φ150-220) having a cross-sectional diameter of 150 to 220 mm and a clamp (φ220 to 220 mm) that can be firmly sandwiched and fixed can be used. 300) and two types of suspension clamps. If the width adjusting jig is not used, it is necessary to replace these two types of hanging clamps according to the diameter of the cross section of the round bar to be sandwiched. Here, when the width adjusting jig 1 was attached to the clamp (φ220 to 300), even a round bar material having a cross-sectional diameter of 130 to 220 mm could be firmly sandwiched and fixed. That is, even if it is one kind of clamp (φ220 to 300), the diameter of the cross section of the round bar that can be firmly clamped and fixed by attaching or removing the width adjusting jig 1 as appropriate is 130 to 300 mm. It could be expanded to a range of 300 mm. As a result, even when the dimensions of the transported item are different, there is an increased chance that it can be handled only by attaching / detaching the width adjusting jig without replacing the heavy load hanging clamp. That is, work efficiency can be improved.

  In this embodiment, the jig body 10 is fixed to the arm 23 by inserting the pressing plate 24a into the square tube portion 9, but the square tube portion 9 is replaced with the square plate instead of the pressing plate 24a even in a clamp without a pressing plate. Can be fixed to the arm. That is, the pulling spring 11 is drawn around the arc of the arm 23, and the square member inserted into the square tube portion 9 is pressed against the arc of the arm and fixed.

  When the presser plate 24 a is used as a square member to be inserted into the square tube portion 9, the presser plate 24 a is fixed to the arm 23, so that the tension spring 11 can be routed inside the arc of the arm 23.

  Further, as described above, the width adjusting jig 1 can be freely attached to and detached from the arm by the combination of the pulling spring 11 and the square member. Therefore, the width adjusting jig can be formed without drilling or the like in the arm whose strength has been designed. 1 can be fixed.

  So far, representative examples and modified examples based on the examples have been described, but the present invention is not necessarily limited thereto. Those skilled in the art will recognize a variety of alternative embodiments without departing from the scope of the appended claims.

DESCRIPTION OF SYMBOLS 1 Width adjustment jig 2 Round pipe part 5 Annular part 9 Square pipe part 10 Jig body 20 Clamp 24a Holding plate (square material)

Claims (4)

This is a hanging clamp width adjustment jig that makes a pair of arc-shaped arms, each end of which is pivotally supported around a rotation axis, rotate in close proximity to support a transported object on the support portion inside the arc. And
A suspension-clamping width adjusting jig, wherein the supporting part is detachably provided to provide a curved surface protruding toward the inside of the arc.   The curved surface is provided by a pair of round tubes provided with a tension spring, and a pair of the round tubes is inserted into the arc of the arm by inserting a square member into a square tube provided along the axis of the round tube. The suspension clamp width adjusting jig according to claim 1, wherein the suspension spring is arranged on an inner side, and the pulling spring is drawn around an outer side of the arc of the arm and fixed to the support portion.   The suspension clamp width adjusting jig according to claim 2, wherein the square member is fixed to the support portion inside the arc of the arm. 4. The suspension clamp width adjusting jig according to claim 2, wherein the round tube is fixed with the axis line being offset from a longitudinal center line of the square member. 5.

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