JP3141398U - Tooth profile structure of suspension clamp - Google Patents

Abstract

To provide a tooth profile structure capable of easily and reliably determining visually that a wear state of a jaw or a cam exceeds a reference value in a suspension clamp.
A jaw is provided facing one side of an opening of a main body and a cam is provided on the other side. When a workpiece is inserted into the opening and lifted, the cam protrudes into the opening via a link mechanism. In the suspension clamp having a structure in which the workpiece is clamped with the jaw by projecting, the teeth 15 formed on the jaw 15 and the workpiece pressure contact surface of the cam are formed on the base portion 28 through the step. The stepped teeth 27 are formed. The tip is gradually worn by repeated use, and the step disappears when the wear limit is reached, so visual confirmation is easy.
[Selection] Figure 3

Description

  The present invention relates to a hanging clamp, and more particularly, to a tooth profile structure of a cam and a jaw that are arranged to face each other in order to grip a workpiece such as a steel material.

This type of clamp has been widely used conventionally, and an example thereof is shown in Patent Document 1 below. This is shown in FIG. 1 and FIG.
JP 2006-347716 A (FIGS. 1 and 2)

  The clamp 10 includes a clamp body 11 (a pair of body plates facing each other with a predetermined interval) provided with a substantially inverted U-shaped opening (work insertion port) 14 between legs 12 and 13 extending downward. Have). Facing the workpiece insertion opening 14, a jaw (swivel jaw) 15 is provided so as to turn freely on the leg 12 side, and a cam 16 is provided on the leg 13 side so as to protrude.

  A vertical groove 17 extending in the vertical direction is formed on the upper inner surface side of the main body 11, and a hanging ring pin 18 is bridged between these vertical grooves so as to be vertically movable. The suspension ring pin 18 penetrates the lower end portion of a known suspension ring 19 and penetrates the upper end portions of a pair of link arms 20 arranged on both sides of the suspension ring 19 inside the main body 11. That is, the suspension ring 19 and the link arm 20 are rotatably connected to each other by the suspension ring pin 18, and when the suspension ring pin 18 moves up and down along the vertical groove 17 in accordance with the lifting / lowering operation via the suspension ring 19, the link arm 20. Also move. FIG. 1 shows a state in which the hanging ring pin 18 is located below the vertical groove 17.

  In the main body 11, a cam pin 21 is horizontally fixed to a lower portion of the work insertion port 14 (in FIG. 1), and the cam 16 is provided so as to be rotatable about the cam pin 21. The cam 16 is connected to the link arm 20 via the link pin 22 so as to be rotatable. With the connection configuration by the link pin 22, the cam 16 rotates around the cam pin 21 as the link arm 20 moves. The position of the cam 16 when the hanging ring pin 18 is located below the vertical groove 17 is as shown in FIG. 1. At this time, the cam 16 does not substantially project toward the work insertion port 14 and the leg of the main body 11. It is housed inside the part 13. That is, at this time, the clamp 10 is in an open state or an unloaded state.

  When the workpiece W is inserted into the workpiece insertion opening 14 from this state and the crane hook (not shown) is hung on the suspension ring 19 and lifted, the suspension ring pin 18 rises along the vertical groove 17, and accordingly. The link arm 20 moves, and the cam 16 rotates clockwise about the cam pin 21. As a result, the cam 16 protrudes to the workpiece insertion port 14, and clamps the workpiece W between the opposing jaws 15 with a clamping force proportional to the suspension load.

  In such a conventional suspension clamp, the jaw 15 and the cam 16 used for gripping the workpiece W bite into the workpiece W during lifting and transportation to prevent slipping, so that the workpiece pressure contact surface is formed in an uneven shape or a tooth shape. ing. For example, concentric ridges 23 are formed on the surface of the jaw 15 (FIG. 8), and parallel teeth 24 are formed on the arc surface of the cam 16 (FIG. 9). It is also known that pyramidal (quadrangular pyramid-shaped) twill teeth (knurled teeth) 25 are formed on the arc surface of the cam 16 (FIG. 10). 8 is formed by lathe processing, and the teeth shown in FIGS. 9 and 10 have a cutting tool (double angular cutter) 26 having a substantially triangular tip shape as shown in FIG. It is formed by cutting using.

  In the suspension clamp according to the prior art, the spiral teeth 23 formed on the surface of the jaw 15 and the parallel teeth 24 or the twill teeth formed on the arc surface of the cam 16 bite into the workpiece W, and the workpiece slides down during transportation. However, if this is repeated, the teeth wear and the biting into the workpiece W is reduced, which may cause the workpiece to slide and fall off. For this reason, the wear state of the jaw and cam teeth must be checked regularly, and those exceeding the reference value (for example, wear width of 0.5 mm or more) must be replaced with new ones. It is difficult to do it thoroughly as a real problem, and often the jaws and cams that have been worn beyond the standard value may continue to be used without being exchanged, and there is a risk of the workpiece slipping.

  Therefore, the problem to be solved by the present invention is to provide a tooth profile structure that can easily and surely determine that the wear state of the jaw or cam exceeds the reference value in the suspension clamp. is there.

  In order to achieve this object, the present invention according to claim 1 is provided when a jaw is provided facing one side of the opening of the main body, a cam is provided on the other side, and a workpiece is inserted into the opening and lifted up. In a suspension clamp having a structure in which a workpiece is clamped with a jaw by projecting the cam so as to protrude into the opening via a link mechanism, at least one of the workpiece pressure contact surface of the jaw and the cam has a wear limit. The tooth profile structure of a hanging clamp is characterized in that stepped teeth are formed.

  According to a second aspect of the present invention, in the tooth profile structure of the suspension clamp according to the first aspect, a stepped tooth indicating a wear limit is formed on the workpiece pressure contact surface of the jaw and the cam.

  According to a third aspect of the present invention, in the tooth profile structure of the suspension clamp according to the first aspect, the stepped teeth formed on the workpiece pressure-contact surface of the jaw include a base portion having a substantially trapezoidal cross section and an upper surface of the base portion. It is a swirl mountain having a tip portion having a substantially triangular cross section formed through a step.

  According to a fourth aspect of the present invention, there is provided the tooth profile structure of the suspension clamp according to the first aspect, wherein the stepped teeth formed on the workpiece pressure-contact surface of the cam include a base portion having a substantially trapezoidal cross section and an upper surface of the base portion. It is a parallel tooth | gear which has the cross-sectional substantially triangular-shaped front-end | tip part formed through a level | step difference in this.

  According to a fifth aspect of the present invention, in the tooth profile structure of the suspension clamp according to the first aspect, the stepped teeth formed on the workpiece pressure-contact surface of the cam include a base having a substantially square frustum shape, and a cut of the base. It is a knurled tooth having a substantially quadrangular pyramid tip formed on the head surface through a step.

  According to a sixth aspect of the present invention, in the tooth profile structure of the suspension clamp according to the fifth aspect, the step is formed on a four-circumferential side edge of the truncated surface of the base or a pair of opposing side edges. To do.

  According to the present invention, the stepped teeth showing the wear limit are formed on the surface of the jaw and / or the cam of the suspension clamp. Can be easily and reliably visually observed to prevent the workpiece from sliding down.

  A stepped tooth having a substantially triangular shape in cross section with a step on the top surface of the base having a substantially trapezoidal cross section, or a substantially quadrangular pyramid having a step on the truncated surface of the base of the quadrangular pyramid shape Forming the shape with a tip of the shape makes it easy to limit the wear by having this part wear and the step disappears while giving the effect of preventing the tip from biting into the work. In addition, the effect of preventing the sliding of the work in advance by observing with certainty is demonstrated.

  FIG. 3 shows a jaw 15 according to an embodiment of the present invention. The standard turning ridge 23 formed on the surface of the conventional suspension clamp jaw (work pressure contact surface) has a substantially triangular cross section (FIG. 8), whereas the surface of the jaw 15 (work pressure contact surface). The formed ridge 27 has a shape in which a tip 30 having a substantially triangular cross section is formed on a base 28 having a substantially trapezoidal cross section via a step 29. The step 29 is provided at a position where the wear limit of the jaw 15 becomes when the tip portion 30 is worn and the step 29 disappears.

  FIG. 4 shows a cam 16 according to an embodiment of the present invention. The standard parallel teeth 24 formed on the arc surface (work pressure contact surface) of the cam of the conventional suspension clamp have a substantially triangular cross section (FIG. 9), whereas the arc surface of the cam 16 (work pressure contact surface). The parallel teeth 31 are formed in a shape in which a tip portion 34 having a substantially triangular cross section is formed on a base 32 having a substantially trapezoidal cross section via a step 33. The step 33 is provided at a position where the wear limit of the cam 16 becomes when the tip 34 is worn away and the step 33 disappears.

  FIG. 5 shows a twill tooth (knurled tooth) 35 formed on the arc surface (work pressing surface) of the cam 16 according to an embodiment of the present invention, and the conventional standard twill tooth (knurled tooth) 25 is a pyramid. In contrast to the shape (square pyramid shape) (FIG. 10), the twill teeth 35 are provided with a step 37 on the fringe surface of the base portion 36 of the quadrangular pyramid trapezoidal shape at the four circumferential side edges. And a quadrangular pyramid tip 38 is formed. The step 37 is provided at a position where the wear limit of the cam 16 is reached when the tip portion 38 is worn away and the step 37 disappears (FIG. 5B).

  FIG. 6 shows a twill tooth 35 ′ according to a modification of the twill tooth 35 shown in FIG. 5, and a step 37 is provided on a pair of side edges facing each other on the truncated surface of the base portion 36 having a truncated pyramid shape. It is different in point. The other points are the same as in the embodiment of FIG.

  FIG. 7 shows a cutting tool (double angular cutter) 39 used for cutting and forming a stepped tooth profile as shown in FIGS. The cutting tool 39 has a tip 40 formed in a substantially triangular shape having a two-step cross section, and has a step 41 therebetween. By using the bit 39 having such a shape, it is possible to form a tooth profile having steps 33 and 37 at locations corresponding to the step 41.

  For example, the parallel teeth 31 with the step 33 shown in FIG. 4 can be formed by relatively moving the cam 16 or the bite 39 in the lateral direction with the bite 39 pressed against the arc surface of the cam 16.

  Further, the twill teeth 35 having the step 37 on the four peripheral edges shown in FIG. 5 first move the cam 16 or the bite 39 in a predetermined direction while pressing the bite 39 against the arc surface of the cam 16. It can form by performing the 2nd cutting process made to move relatively in the direction orthogonal to this cutting process and this. At this time, if one of the first and second cutting processes is performed with the cutting tool 39 and the other cutting process is performed with the conventional cutting tool 26 (FIG. 11), the twill having the step 37 on the opposite side edge shown in FIG. Eye teeth 35 'are formed.

  In the embodiment shown in FIG. 3, a lathe with a step 29 is formed by using a normal bite or a figure bite after forming a lathe mountain 28 (the lath mountain 23 in FIG. 8) similar to the prior art by lathe processing. Mountains can be formed.

It is a front view shown in the no-load state which shows an example of the type of suspension clamp which can apply this invention. It is a load state front view of the suspension clamp. The top view of the jaw by one Embodiment of this invention (a), (a) AA sectional drawing in a figure, (b) X part enlarged view in a figure. 1A is a plan view of a cam according to an embodiment of the present invention, FIG. It is the non-abrasion state top view (a) and wear limit state top view (b) of the cam by other embodiment of this invention. It is a non-wear state top view (a) and a wear limit state top view (b) of the modification of the cam of FIG. It is a figure which shows the bite shape used in order to form the stepped tooth profile shown in FIGS. It is the top view (a) and AA sectional drawing (b) of the jaw which are normally used for the conventional suspension clamp. It is the front view (a) and side view (b) of the cam which are normally used for the conventional suspension clamp. It is a perspective view which shows the shape of the twill teeth normally formed in the cam surface of the conventional hanging clamp. It is a figure which shows the bite shape used in order to form a tooth | gear on the workpiece pressure-contact surface of these conventional standard jaws / cams.

Explanation of symbols

10 Clamp 11 Body 12, 13 Leg 14 Opening (Work Insertion Port)
15 Joe (swivel jaw)
16 Cam 17 Vertical groove 18 Suspension ring pin 19 Suspension ring 20 Link arm (link mechanism)
21 Cam Pin 22 Link Pin 23 Conventional Jaw Twist 24 Conventional Cam Parallel Teeth 25 Conventional Cam Pyramid Spiral Teeth 26 Cutting Tool for Cutting Conventional Teeth (Double Angular Cutter)
27 Stepped Teeth (Jo's Mt.
28 base 29 step 30 tip 31 stepped teeth (parallel teeth of cam)
32 Base 33 Step 34 Tip 35, 35 'Stepped teeth (cam tooth)
36 base 37 step 38 tip 39 stepped tool for cutting and forming stepped teeth (double angular cutter)

Claims (6)

A jaw is provided facing one side of the opening of the main body and a cam is provided on the other side. When a workpiece is inserted into the opening and lifted up, the cam protrudes into the opening via the link mechanism. In the suspension clamp having a structure in which the workpiece is clamped between the jaw and the jaw, a stepped tooth indicating a wear limit is formed on at least one of the jaw and the workpiece pressing surface of the cam. Tooth profile structure of hanging clamp. The tooth profile structure of a suspension clamp according to claim 1, wherein stepped teeth indicating a wear limit are formed on the workpiece pressure contact surfaces of the jaw and the cam. The stepped tooth formed on the workpiece pressure contact surface of the jaw has a base portion having a substantially trapezoidal cross section, and a tip portion having a substantially triangular cross section formed through a step on the upper surface of the base portion. The tooth profile structure of the hanging clamp according to claim 1, wherein: The stepped teeth formed on the workpiece pressure contact surface of the cam are parallel teeth having a base portion having a substantially trapezoidal cross section and a tip portion having a substantially triangular cross section formed via a step on the upper surface of the base portion. The tooth profile structure of the hanging clamp according to claim 1, wherein The stepped teeth formed on the workpiece pressure contact surface of the cam have a substantially quadrangular frustum-shaped base and a substantially quadrangular pyramid-shaped tip formed on the truncated surface of the base via a step. The tooth profile structure of a hanging clamp according to claim 1, wherein the tooth profile structure is a knurled tooth. The tooth profile structure of a hanging clamp according to claim 5, wherein the step is formed on a four-circumferential side edge of the truncated surface of the base or a pair of opposing side edges.

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