JP4630883B2 - Cuneiform wedge clamp - Google Patents

Description

  The present invention relates to a wedge-type clamp suitable for holding and connecting a strip represented by a rope.

  A "wedge-type clamp" is known as a means for holding the ends of the strips such as wire ropes and tendons, or connecting the strips in series. There were the following three types.

1) As shown in FIG. 1 (a), the contact surface of the wedge piece A with respect to the strip 4 is provided with a tooth profile a running in a direction intersecting the axis.
2) A friction increasing material is attached to the surface of the wedge piece that contacts the strip.
3) As shown in FIG. 1 (b), the wedge piece A is pushed into the clasp body B by an insertion tool (not shown) in advance before use. This is often used to retain overhead transmission lines.

  1) As for 2), it is possible to obtain reasonable performance with a small-sized strip having a diameter of about 8 mm, but when applied to a large-sized strip having a diameter of 10 mm or more and 12 to 18 mm, 100% fastening is achieved. There is a problem that the efficiency cannot be satisfied, and 2) uses a member for increasing the coefficient of friction, so that there is a problem that the cost increases accordingly.

3) Since the wedge piece is pushed in with a large load in advance by a hydraulic tool or the like, it takes a considerable amount of time to perform the work, and the workability is poor, and the proper push force management is difficult and the performance tends to vary. was there.

The present invention has been made in order to solve the above-described problems, and the object of the present invention is to provide a simple structure that can achieve a strong fastening efficiency that does not cause slippage by simply inserting the structure. To provide a wedge type clamp.
In the present invention, the “strip” is a concept including a rod-like object such as a reinforcing bar in addition to a collection of filaments such as a rope, a cable, and a tension material.

In order to achieve the above object, the present invention has a through-hole through which a circular section of a circular section is inserted, and an arc-shaped groove having a curved surface corresponding to the outer diameter of the strip in a section perpendicular to the axis of the through-hole. A main body having a slope that is 180 degrees symmetrical to the arcuate groove and that is inclined forward in the direction in which a traction force acts, and a wedge body that is inserted between the slope and the strip of the main body, An elastic member is engaged with the end, and the wedge is inserted into the main body, and is configured to be pulled in a direction opposite to the direction in which the strip is pushed. The opening is larger than the diameter of the strip, and the inside has a V-shaped groove whose width is reduced by an inclination angle of 50 to 70 degrees so as to contact two points in the left-right direction of the strip , and the friction between the wedge and the strip It is characterized in that the force has twice the frictional force between the main body and the wedge body .

  When the friction coefficient between the main body and the wedge body is μ1, and the friction coefficient between the wedge body and the stripe body is μ2, the slide body does not slip if μ2> μ1, but according to the present invention, the wedge Since the surface of the body that contacts the strip is a V-shaped groove, the friction coefficient between the wedge body and the strip has twice the friction coefficient between the main body and the wedge body, and μ2> μ1. Can be fully achieved. Moreover, since it can prevent slipping if it can contact the wall surface of the V-shaped groove, it can achieve the above performance even if the diameter of the strip is different within a certain range with one type of wedge, and the structure is simple and can be implemented at low cost. An effect is obtained.

The main body is a single through hole, and has a yoke-shaped bracket before the through hole.
According to this, it is possible to perform retaining with high fastening efficiency by connecting the mooring part to the fixed object.

The main body has through holes up and down via an intermediate wall, and a wedge body is inserted into the through holes in the opposite direction.
According to this, a rope can be connected efficiently.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
2 to 4 show an example in which the present invention is applied to a clamping clamp.
1 is a main body made of steel or the like, has a rectangular tube shape, has a through-hole 10 through which a strip (in this example, a rope) 4 can pass freely, and has a yoke-like shape for holding at the end. The bracket 11 is integrally provided. The bracket 11 is provided with a connection hole 110. Reference numeral 2 denotes a wedge inserted in the main body 1 and is made of steel or the like.

An arc-shaped groove 13 having a certain depth and having a curvature surface corresponding to the outer diameter of the strip 4 is formed in an axial direction on the bottom wall portion constituting the through hole 10 of the main body 1. The slope 14 inclined forward in the direction in which the traction force acts is formed at the 180-degree symmetrical position, that is, the top wall portion. As a result, the cross-sectional area of the through-hole 10 increases toward the rear in the axial direction.
In this embodiment, the outer surface of the main body is also an inclined surface, but is not limited to this, and may be parallel to the outer surface of the bottom.

The wedge body 2 is formed of a block piece having a required length, and both sides in the width direction have surfaces 20 and 20 parallel to the left and right side walls of the through hole 10 of the main body 1 and are upper surfaces to be in contact with the inclined surfaces 14 of the main body. Is formed with a slope 21 inclined downward in the axial direction.
In addition, a V-shaped groove 22 is formed in the surface of the wedge body 2 at the lower surface side center portion so as to be in contact with the strip 4. The top of the V-shaped groove 22 is on the center line, and the top is a truncated horizontal shape in this example.

The V-shaped groove 22 has a shape in which the opening at the lower end is larger than the diameter of the strip 4 and gradually decreases in width so as to contact two points in the left-right direction of the strip 4 inside. It is selected from the range of 50 to 70 degrees. The V-shaped groove 22 preferably has the same depth over the entire length of the wedge body 2. The angle of the entrance of the V-shaped groove 22 may be increased.

Reference numeral 3 denotes an elastic member that presses the rear end of the wedge body 2 and is inserted into the through-hole 10 through a slit 15 provided at the end portion of the main body 1, and is a locking portion 23 formed at the end portion of the wedge body 2. Thus, the initial position of the wedge body 2 can be accurately set.

6 and 7 show an example in which the present invention is applied to a clamp for connecting a plurality of strips.
In this embodiment, the main body 1 has a partitioning intermediate wall 12 in a cross section perpendicular to the axial direction, and through holes 10 and 10 are provided above and below the intermediate wall 12, respectively.

The arc-shaped grooves 13 and 13 are formed on the upper surface and the lower surface of the intermediate wall 12, respectively, and inclined surfaces 14 and 14 are formed on opposite sides of the intermediate walls 12 with their forward tilt directions reversed.
The two wedge bodies 2 and 2 are inserted in the through holes 10 and 10 in opposite directions, and each wedge body 2 and 2 has an inclined surface 21 to be in contact with the inclined surface 14 as in the first embodiment, and a strip. 4 has a V-shaped groove 22 to be contacted.
The description of Example 1 is used for those details.

  Since the present invention is configured as described above, the strip 4 is inserted in the state in which the wedge body 2 is inserted into the main body 1 and pulled in the direction opposite to the insertion direction, whereby the wedge body 2 is moved and tightened. As shown in FIG. 5, the angle of the V-shaped groove 22 is 60 degrees, the coefficient of friction between the main body 1 and the wedge body 2, and the friction coefficient between the wedge body 2 and the strip body 4 are μ1, respectively, and W in the vertical direction. When a tightening load is applied, the frictional force between the main body 1 and the wedge body 2 is Wμ1, while the frictional force between the wedge body 2 and the strip 4 is 2Wμ1 as shown in FIG.

  As described above, conventionally, when the friction coefficient μ1 between the wedge body and the main body and the friction coefficient between the wedge body and the stripe are μ2, μ2> μ1 is obtained by forming a tooth shape or interposing a friction increasing material. However, the fastening efficiency was reduced when the strip size was large. In the method 3), since μ2 = μ1, the wedge body was pushed in advance with a considerably large load to compensate for the frictional force.

  However, in the present invention, as described above, the frictional force between the wedge body 2 and the strip 4 is 2 Wμ1, and the friction coefficient between the wedge 2 and the strip 4 is the friction coefficient between the main body 1 and the wedge 2. It has the same effect as having twice. Therefore, the above μ2> μ1 can be sufficiently satisfied, and even when the diameter of the strip is large, the fastening efficiency of 100% can be achieved without causing slip.

(A) (b) is sectional drawing which shows the conventional wedge type clamp. It is a top view which shows the Example (Example 1) which applied this invention to the clamping clamp. It is a vertical side view of Example 1. FIG. It is sectional drawing which follows the XX line of FIG. It is explanatory drawing which shows the effect | action of this invention. It is a vertical side view of the Example (Example 2) which applied this invention to the clamp for connection. It is sectional drawing which follows the YY line | wire of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Wedge body 3 Elastic member 4 Strip body 10 Through-hole 11 Bracket
12 Intermediate wall 13 Arc-shaped groove 14 Slope 21 Slope 22 V-shaped groove

Claims (3)

A cross-section having a through-hole penetrating a circular strip having a cross-section, an arc-shaped groove having a curvature surface corresponding to the outer diameter of the strip on a cross-section perpendicular to the axis of the through-hole, and a portion symmetrical with the arc-shaped groove by 180 degrees A main body having a slope inclined forward in the direction in which the traction force acts, and a wedge body inserted between the slope and the strip of the main body, and an elastic member is engaged with the end of the wedge body. The wedge body is configured to be pulled in a direction opposite to the direction in which the strip body is pushed in with the wedge body inserted therein, and the wedge body has a lower end opening larger than the strip diameter on the surface contacting the strip body, The inside is provided with V- shaped grooves whose width is reduced at an inclination angle of 50 to 70 degrees so as to contact two points in the left-right direction of the strip, and the frictional force between the wedge body and the strip is the frictional force between the main body and the wedge body. A wedge-type clamp of the strip characterized by having 2 times .   The wedge-shaped clamp for a strip according to claim 1, wherein the main body is a single through hole, and has a yoke-shaped bracket ahead of the through hole. 2. The wedge-type clamp for a strip according to claim 1, wherein the main body has through-holes vertically through an intermediate wall, and a wedge body is inserted into the through-holes in opposite directions.

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