JP2010058960A - Jaw of suspension clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of a phenomenon of damaging when a concentrated load acts on a tooth crest on the outermost peripheral side, in a jaw of a suspension clamp. <P>SOLUTION: This suspension clamp is constituted so as to suspend by sandwiching a work such as a flat steel plate and shape steel between a cam and the jaw. The occurrence of the phenomenon of damaging when the concentrated load acts on the tooth crest 15c positioned on the outermost periphery, is prevented by arranging so as to retreat the tooth crest 15c on the outer peripheral side more than a tooth crest 15a on the inner peripheral side, by forming a plurality of tooth crests 15a, 15b and 15c formed in a concentric shape on a work abutting surface of the jaw 19 in a spherical shape of a radius R. An embodiment may be adopted (Fig.3) for arranging at least one outer peripheral side tooth crest including a tooth crest on the outermost peripheral side so as to be positioned on a second plane retreated by a predetermined distance from a first plane, by arranging at least one inner peripheral side tooth crest including a tooth crest on the innermost peripheral side so as to be positioned on the first plane. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a suspension clamp configured to lift a workpiece such as a flat steel plate or a shape steel between a cam and a jaw, and more particularly to a new tooth profile of a jaw of the suspension clamp.

Various types of suspension clamps used to lift workpieces such as flat steel plates and section steels are gripped by cams and jaws (also called a catcher. Also, screw clamps may be configured as clamping pads). As the work load (load) increases, the tightening force automatically increases through the boosting action of the link mechanism and the cam mechanism, and the cam bites into the work and grips the work. A suspension clamp having such a structure is well known (for example, Patent Document 1 below).
Japanese Patent Laid-Open No. 2006-347716 (FIGS. 1 and 2) On the surface of a jaw in a conventional suspension clamp, a spiral tooth consisting of two or three peaks is provided to increase the gripping force for a workpiece sandwiched between cams. Mountains are concentrically formed. FIG. 4 and FIG. 5 show an example of a conventional jaw having a spiral tooth crest A, B, C on its surface. The cross sections of the tooth crests A, B, and C are substantially triangular, and the inner and outer inclination angles θ are 45 degrees with the tooth vertex D as the center, and therefore the tooth crest angle is 2θ = 90 degrees. Further, tooth teeth A, B, and C are on the same plane E.

  When the workpiece is gripped and lifted with the cam using such a conventional jaw, if the workpiece is twisted or tilted, the workpiece does not uniformly contact the jaw surface (tooth crest). In particular, a phenomenon in which a concentrated load acts on the tooth crest located on the outermost periphery and breaks frequently occurs.

  Accordingly, an object of the present invention is to prevent the tooth crest of the jaw in the suspension clamp from being broken and to improve the durability.

  In order to solve this problem, the present invention according to claim 1 is a suspension clamp configured to lift a workpiece such as a flat steel plate or a shaped steel sandwiched between a cam and a jaw. A jaw of a suspension clamp, wherein a plurality of tooth teeth formed concentrically with each other are provided with a tooth tooth on the outer peripheral side set back from the tooth tooth on the inner peripheral side.

  According to a second aspect of the present invention, in the suspension clamp jaw according to the first aspect, a plurality of tooth crests formed concentrically on the workpiece contact surface are formed in a spherical shape with a predetermined radius. .

  According to a third aspect of the present invention, in the suspension clamp jaw according to the first aspect, at least one of the plurality of tooth crests formed concentrically on the work contact surface includes a tooth crest on the innermost peripheral side. The circumferential tooth is located on the first plane, and at least one outer circumferential tooth including the outermost tooth is on a second plane that is set back a predetermined distance from the first plane. It is provided so that it may be located.

  According to the present invention, in the suspension clamp, the tooth teeth on the outer peripheral side of the plurality of tooth teeth formed concentrically on the workpiece contact surface of the jaw are set back from the tooth teeth on the outer peripheral side. So, when gripping with a workpiece sandwiched between the jaw and cam, first the tooth on the inner circumference bites into the workpiece, then the tooth on the outer circumference bites, and the outer circumference is highly likely to break. This has the effect of preventing damage to the tooth teeth and increasing the durability.

  The invention will be described in more detail below with reference to examples.

  FIG. 1 shows, as an example of a suspension clamp targeted by the present invention, a vertical suspension clamp 10 that is particularly suitable for clamping a vertical surface portion of a workpiece such as a flat steel plate or a shaped steel from both sides thereof. The clamp 10 has a clamp body 11 having a substantially inverted U-shaped opening (work insertion port) between legs 12 and 13 extending downward. The leg 12 is provided with a cam 20 connected to the lower end of the link arm 24 so as to be able to protrude from the work insertion port, and the leg 13 is provided with a jaw (swivel jaw) 19 so as to be rotatable toward the work insertion port. It has been. When a crane hook or the like of the suspension ring 23 is inserted and lifted with the workpiece W inserted into the workpiece insertion port, the cam 20 protrudes to the workpiece insertion port via the link arm 24, and the workpiece W is placed between the jaw 19 and the workpiece W. Grip with the tightening force of.

  FIG. 2 shows an embodiment of the present invention for jaw 19. Three tooth crests 14a, 14b and 14c are formed concentrically on the surface of the jaw 19 (work contact surface). These tooth crests 14a, 14b and 14c are provided on a spherical surface having a radius R. Yes. Therefore, the innermost peripheral tooth crest 14a is at the highest position protruding most in the workpiece W direction, and the outermost peripheral tooth crest 14c is at the lowest retracted position. That is, as shown in FIG. 1, the innermost tooth crest 14a first bites into the workpiece W with respect to the workpiece W inserted between the jaw 19 and the cam 20 and inserted into the workpiece insertion opening, Thus, the tooth crest 14b at the intermediate position bites in, and finally the tooth crest 14c on the outermost peripheral side bites in. For this reason, in the jaws according to the prior art (FIGS. 4 and 5) in which all the tooth crests are formed on the same plane, the concentrated load acts on the tooth claw on the outermost peripheral side that is most likely to break. This can avoid the damage to the tooth crest 14c on the outermost peripheral side, and the service life is improved.

  FIG. 3 shows another embodiment of the present invention for jaw 19. Three tooth crests 15a, 15b, 15c are formed concentrically on the surface of the jaw 19 (work contact surface). Of these, the two tooth crests 15a, 15b located on the inner peripheral side are the first ones. In contrast to the first flat surface 16, the outermost tooth crest 15 c is provided on the second flat surface 17 that is retracted from the first flat surface 16 by a distance X (with respect to the workpiece W). Yes. Therefore, as shown in FIG. 1, the two tooth crests 15 a and 15 ba on the inner peripheral side bite into the workpiece W with respect to the workpiece W inserted between the jaw 19 and the cam 20 and inserted into the workpiece insertion port. Later, the outermost teeth 15c bite. For this reason, in the conventional jaw (FIGS. 4 and 5) in which all the teeth are formed on the same plane, it is avoided that concentrated load acts on the teeth on the outermost peripheral side that is most likely to be damaged. In addition, it is possible to prevent damage to the tooth crest 15c on the outermost peripheral side, and the service life is improved. The retraction difference X between the first plane 16 and the second plane 17 varies depending on the size of the jaw 19 and the like, but is preferably about 0.1 to 1.0 mm.

  Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to these embodiments, and various modifications are possible within the scope of the invention ascertained from the description of the claims. Can take. For example, in the illustrated embodiment, three teeth are concentrically formed on the surface of the jaw, but the number of teeth is not limited to this, and may be two or four or more. . In Example 2, when the number of tooth teeth is two, the tooth teeth on the outer peripheral side are made to recede from the tooth teeth on the inner peripheral side. When the number of teeth is four or more, only the innermost tooth crest or two or more tooth crests including the tooth crest are provided on the first plane, and only the outermost tooth crest or only 2 including the tooth crest is included. One or more teeth are provided on a second plane that is retracted from the first plane. Further, when three or more tooth teeth are provided in Example 2, the tooth teeth including the innermost tooth teeth are provided on the first plane, and the tooth teeth including the outermost tooth teeth are first. It may be provided on a second plane that is retreated from the plane, and the hayama between them may be provided on one or a plurality of planes between the first plane and the second plane.

  In the first and second embodiments, a mounting hole 18 for pivotally mounting the jaw 19 to the leg portion 13 of the clamp 10 is formed at the center of the jaw 19, which is the subject of the present invention. The present invention is not directly related, and is not necessarily required in an embodiment in which the present invention is applied to a fastening pad of a screw-type clamp or the like.

  In addition, dimensions such as the height (thickness) of the jaw 19 can be arbitrarily set, and the shape thereof is not limited to the shape of the illustrated embodiment, and can be arbitrarily set such as a cylindrical shape or a stepped shape. it can.

It is a load state figure of the clamp for vertical suspension as an example to which the jaw by the example of the present invention is applied. 1 is a cross-sectional view of a jaw according to an embodiment of the present invention. It is sectional drawing of the jaw by other Examples of this invention. It is the top view (a) and side view (b) which show the conventional jaw shape. It is an expanded sectional view of the conventional jaw shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Clamp for vertical suspension 11 Clamp body 12, 13 Leg part 14a, 14b, 14c Concentric tooth 15a, 15b Tooth 15c on the 1st plane 16 Tooth 16 on the 2nd plane 17 1st plane 17 Second plane 18 Mounting hole 19 Jaw 20 Cam 23 Suspension ring 24 Link arm

Claims (3)

In a suspension clamp configured to lift a workpiece such as a flat steel plate or shape steel between a cam and a jaw, the inner peripheral side of a plurality of teeth formed concentrically on the workpiece contact surface of the jaw A jaw of a suspension clamp, wherein the tooth teeth on the outer peripheral side are set backward from the tooth teeth. The jaw of the suspension clamp according to claim 1, wherein a plurality of teeth formed concentrically on the workpiece contact surface are formed in a spherical shape having a predetermined radius. Among the plurality of teeth formed concentrically on the work contact surface, at least one inner peripheral tooth including the innermost tooth is provided on the first plane, and the outermost The jaw of the suspension clamp according to claim 1, wherein at least one outer peripheral side tooth tooth including a tooth tooth on the side is provided on a second plane which is set back by a predetermined distance from the first plane. .

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