JP5843493B2 - Hanging clamp - Google Patents

Description

  The present invention relates to a suspension clamp mainly used for lifting a workpiece such as a flat steel plate or a section steel.

  The suspension clamp inserts the workpiece until it hits the inner surface of the opening of the main unit, and operates the latch handle of the locking device to apply the initial tightening force with the spring, so that the workpiece is received from both sides with a cam and a receiving member (such as a swivel jaw) It is lifted and transported in a state of being sandwiched between and 2.5 to 3 times depending on the work mass through the boosting action of the link mechanism built in the suspension clamp when it is lifted by a crane or the like. A certain amount of tightening force acts on the cam and the receiving member, and the cam teeth are bitten into the workpiece surface so as to be securely gripped.

JP 2006-347716 A

  When the lifting ring of the clamp on which the workpiece is set is lifted by a crane or the like, after the workpiece is grounded, the cam teeth bite into the workpiece surface while the cam rotates, and the tightening force due to the boosting action is applied to the workpiece. At this time, a force that pushes the workpiece toward the inlet of the clamp body opening is acted by the rotation of the cam. For this reason, when the work is securely gripped by the boosting action, a gap of about several millimeters (for example, 2 to 5 mm) is generated between the work end face and the back surface of the opening of the clamp body. Will be done.

  For this reason, the workpiece swings with respect to the workpiece gripping fulcrum (cam and receiving member) during workpiece transfer. This lateral run-out occurs until the workpiece end surface hits both ends of the clamp body opening inner surface in the width (thickness) direction centering on the vertical center of the clamp (the cam and the receiving member are located on this center line). It can occur within the range of the runout.

  If the workpiece shakes greatly during conveyance, the vibration and impact caused by the workpiece will act on the workpiece. In some cases, the workpiece may collide with a nearby structure and be damaged. May decrease.

Accordingly, an object of the present invention is to provide a suspension clamp that can suppress the lateral deflection of a workpiece that may occur during conveyance.

In order to solve the above-mentioned problem, the present invention according to claim 1 includes a clamp body having a substantially U-shaped opening serving as a work insertion opening, a rotatable cam provided on one side of the opening, and an opening. A receiving member provided on the other side, a suspension ring movably provided in a predetermined direction with respect to the clamp body, and a suspension ring connected between the suspension ring and the cam and lifted by a crane or the like. A link that works to move the cam from one side of the opening in conjunction with the movement, and the clamp body so that its lower surface is substantially flush with the inner surface at the position facing the inner surface of the opening of the clamp body A pair of work padding materials provided so as to project on both sides of the width direction of the workpiece, and the lateral swing of the work that occurs when lifting and transporting the work inserted into the opening is reduced by the pair of work padding materials. And

According to the first aspect of the present invention, the pair of work pads projecting on both sides in the width direction of the clamp body so that the bottom surface thereof is substantially flush with the back surface at the position facing the back surface of the opening of the clamp body. Since the material is provided, it is possible to reduce the lateral vibration of the workpiece that occurs when the workpiece inserted into the workpiece insertion port is lifted and transported by the pair of workpiece abutting materials. That is, since the cam is rotated from when the work is set to when the work is surely gripped between the cam and the receiving member by the link boosting mechanism, the work upper end surface and the clamp opening back surface a slight gap occurs between, for this gap, but next to the workpiece runout during workpiece transfer occurs, since the horizontal deflection width by attaching a workpiece against material can be greatly suppressed, the above-mentioned It has the effect of eliminating the disadvantages encountered by the prior art.

  Since the lower surface of the workpiece abutting material is provided substantially flush with the inner surface of the opening of the clamp main body, there is no obstacle during the initial setting of the workpiece. Rather, the surface where the upper end of the workpiece hits continuously from the back of the clamp body opening will extend outward from both sides of the clamp to give a wider surface. When this is done, the state becomes obvious from both sides of the clamp, and as a result, it is possible to prevent the workpiece from being set in an inclined state.

It is a front view which shows the vertical suspension clamp by one Embodiment of this invention in the state in which the cam was embed | buried in the main body. It is a side view of the same state as FIG. It is a front view which shows the initial state which set the workpiece | work to this vertical suspension clamp. FIG. 4 is a front view showing a state in which a gap is generated between the rear surface of the opening of the clamp body and the upper end surface of the workpiece when the suspension ring is lifted by a crane or the like from the state of FIG. 3. FIG. 5 is a side view showing that the lateral deflection width of the workpiece is reduced due to the occurrence of the gap in the same state as in FIG. 4. It is a side view which shows that a workpiece | work shakes greatly by the said clearance gap producing in the vertical suspension clamp by a prior art.

  A vertical suspension clamp 10 according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The vertical suspension clamp 10 mainly lifts and conveys a vertical surface portion of a workpiece such as a flat steel plate or a shape steel from both sides thereof, and is substantially reversed between leg portions 12 and 13 extending downward. A pair of clamp body plates 11, 11 (hereinafter referred to as “main body 11”) having a U-shaped opening 14 are juxtaposed at a predetermined interval by a spacer member 15. 16 and 16 are fixed by welding. Below the reinforcing plates 16, 16 are formed substantially identical openings 17, 17 having a slightly larger width than the opening 14 formed below the main body 11. The lower end of the spacer member 15 slightly protrudes from the leg portion 11 into openings 14 and 17 (hereinafter, these openings are collectively referred to as “work insertion port 18”). A swiveling jaw 19 is attached rotatably so as to hold and lift the work W in cooperation with 20.

  A long groove 21 extending in the vertical direction is formed on the upper surface of the inner surface of the main body 11 so as to face each other, and a hanging ring pin 22 is bridged between these long grooves so as to be movable up and down. The suspension ring pin 22 penetrates the lower end portion of the known suspension ring 23 and also penetrates the upper end portions of the pair of links 24, 24 arranged on both sides of the suspension ring 23 in the main body 11. That is, the suspension ring 23 and the link 24 are rotatably connected to each other by the suspension ring pin 22, and when the suspension ring pin 22 moves up and down in the long groove 21 in accordance with the lifting / lowering operation via the suspension ring 23, the link 24 also moves. FIG. 1 and FIG. 2 show a state in which the hanging ring pin 22 is in a lower position in the long groove 21.

  In the main body 11, a cam pin 25 is horizontally fixed to a lower portion of the work insertion port 18 on the left side (in FIG. 1), and the cam 20 is rotatably provided around the cam pin 25. The cam 20 is connected to the link 24 via a link pin 26 so as to be rotatable. With the connection configuration by the link pin 26, the cam 20 rotates around the cam pin 25 as the link 24 moves. The cam 20 when the hanging ring pin 22 is in the lower position in the vertical groove 21 is in the position shown in FIGS. 1 and 2, and at this time, the cam 20 does not substantially protrude toward the workpiece insertion port 18. Is housed inside (in the leg portion 13). That is, at this time, the clamp 10 is in an open state or an unloaded state.

  The clamp 10 includes a latch 28 that is rotatable about a latch pin 31 fixed to the body 11, a latch lever 32 that is provided integrally with the latch 28, and a latch handle that protrudes from the tip of the latch lever 32. 33, and a latch-type locking device 27 having a lock spring 30 provided between the latch 28 and a spring pin 29 located near the lower end of the link 24, and using the spring force of the lock spring 30. Thus, an initial tightening force is applied to the workpiece W in a state where the mass of the workpiece W is not acting on the clamp 10.

  In FIGS. 1 and 2, the tension of the lock spring 30 is not applied, and the lock spring 30 is in the unlocked state. After inserting the workpiece W into the workpiece insertion slot 18, the latch 28 is pulled up by the latch handle 33 protruding outward from the tip of the latch 28, and rotated clockwise (FIG. 1) about the latch pin 31 as shown in FIG. Then, the tension of the lock spring 30 is transmitted to the cam 20, and the cam 20 is rotated in the clockwise direction (FIG. 3) about the cam pin 25, and an initial tightening force is applied to the workpiece W. 19 and press-clamping.

  Reference numeral 34 denotes a handle used when the clamp 10 is manually lifted and transported, and is fixed to the main body 11 so as to protrude outward from both side surfaces of the main body 11.

  The configuration and operation of the vertical suspension clamp 10 described above are substantially the same as those of the prior art. However, the clamp 10 has an opening rear surface of the main body 11 (a rear surface 18a of the workpiece insertion port 18) and a substantially surface. Work abutting members 35 and 35 projecting from both sides of the main body 11 are provided so as to become one.

  The operation of the vertical suspension clamp 10 provided with the workpiece contact material 35 will be described. A workpiece W such as a flat steel plate is inserted into the back surface 18a of the workpiece insertion port 18 of the clamp 10 in an unloaded state (FIGS. 1 and 2) until the upper end surface abuts, and in this state, the latch is performed as described above. By pulling up the latch 28 via the handle 33, an initial tightening force is applied to the workpiece W by the tension of the lock spring 30 (FIG. 3). At this time, the upper end surface of the workpiece W is in contact with the inner surface 18a of the clamp opening without any gap.

  When a crane hook (not shown) is locked to the suspension ring 23 from this state and the clamp 10 is pulled up by a crane (not shown), the weight of the clamp 10 and the mass of the workpiece W act as described above. Therefore, the suspension ring pin 22 moves upward in the long groove 21, the cam 20 rotates clockwise about the cam pin 25 via the link 24 (FIG. 3), and the cam teeth 20 a cut into the arcuate tip portion are formed. The workpiece W protrudes toward the workpiece insertion port 18 and securely grips the workpiece W between the opposing rotary jaws 19 by a boosting action. As already described in the prior art, the workpiece is applied when this boosting action is applied. A slight gap L is formed between the upper end surface Wt and the clamp opening back surface 18a (FIGS. 4 and 5).

  When the workpiece contact material 35 is not present (prior art), because of this gap L, the clamp body opening centered on the vertical center C of the clamp with respect to the workpiece gripping fulcrum (cam 20 and swivel jaw 19) during workpiece transfer. This occurs within the range of a relatively large deflection width θ2 until the workpiece upper end surface Wt hits the end portions on both sides in the width (thickness) direction of the back surface 18a (FIG. 6). For this reason, as described above, vibrations and impacts due to lateral vibrations act on the workpiece W, and in some cases, the workpiece W may collide with a nearby structure and be damaged. There is a risk of reducing the value of the product.

According to the vertical suspension clamp 10 of the present invention provided with the workpiece abutting member 35, the lateral deflection width is reduced to θ1 (<< θ2) (FIG. 5), so that the above problem can be substantially solved. . Since the lower surface of the workpiece abutting member 35 is provided substantially flush with the inner surface 18a of the clamp body opening, there is no hindrance when the workpiece W is initially set (FIG. 3), and it is lifted and transported by a boosting action. In this case (FIGS. 4 and 5), the surface which the workpiece upper end surface Wt hits when the workpiece W swings continuously from the clamp body opening inner surface 18a is extended outward from both sides of the clamp. Therefore, the lateral runout can be greatly suppressed.

  Further, according to the prior art, even if the workpiece upper end surface Wt is set against the clamp body opening inner surface 18a when the workpiece W is initially set (FIG. 3), the state can be viewed from the side of the clamp. In reality, the workpiece W is set in a state tilted to the left or right, and a gap may be formed on the opposite side. However, according to the vertical suspension clamp 10 of the present invention, the workpiece pad 35 Provides a wide workpiece contact surface by being provided flush with the clamp body opening inner surface 18a, so that when the workpiece W is set in an inclined state, the state can be clearly seen from both sides of the clamp. Can see. Therefore, there is an advantage that the workpiece W can be prevented from being set in a tilted state.

  In order to achieve these functions, it is preferable to set the dimension (projecting length outward) of the workpiece contact material 35 so that the lateral deflection width θ1 is 8 degrees or less.

Although the present invention has been described as an embodiment in which the present invention is applied to a vertical suspension clamp, the present invention can also be applied to a lateral suspension clamp formed so that a workpiece insertion opening faces a horizontal (horizontal) direction. That is, also in the horizontal suspension clamp, when the workpiece W is lifted by a crane from the initial setting of the workpiece W, a gap is generated between the inner surface of the opening of the clamp body and the upper end surface of the workpiece. Although it may cause horizontal shaking in the horizontal plane, it can be minimized by providing a workpiece abutting material as in the case of the vertical suspension clamp described above, and set with the workpiece W tilted. Can be prevented in advance.

10 Vertical suspension clamp 11 Body (main body plate)
12, 13 Leg 14 Opening 15 under body 15 Spacer member 16 Reinforcement plate 17 Opening under reinforcement plate 18 Workpiece insertion port 18a Back surface 19 Revolving jaw (receiving member)
20 Cam 20a Cam tooth 21 Long groove 22 Suspension ring pin 23 Suspension ring 24 Link 25 Cam pin 26 Link pin 27 Latch type lock device 28 Latch 29 Spring pin 30 Lock spring 31 Latch pin 32 Latch lever 33 Latch handle 34 Handle 35 Work pad W Work Wt Work Top face

Claims (1)

Predetermined with respect to the clamp body having a substantially U-shaped opening serving as a workpiece insertion opening, a rotatable cam provided on one side of the opening, a receiving member provided on the other side of the opening, and the clamp body When the suspension ring is connected to the suspension ring and the cam and is lifted by a crane or the like, the cam is protruded from one side of the opening in conjunction with the movement. And a pair of workpiece abutting members provided to protrude on both sides in the width direction of the clamp body so that the lower surface thereof is substantially flush with the back surface at a position facing the back surface of the opening of the clamp body. A suspension clamp comprising: a pair of workpiece abutting members that reduce lateral vibration of a workpiece that occurs when the workpiece inserted into the opening is lifted and transported.

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