JPH0314794Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applicable to electric wire connection sleeves into which two electric wires to be connected are inserted, and electric wire repair sleeves which are placed over damaged parts of electric wires. The present invention relates to a compression device for compressing a sleeve for use.

[Prior Art] Conventionally, as this type of electric wire sleeve compression device, one having a structure shown in FIG. 8 is known. One of the opposing dies 101 and 102 is connected to a piston (not shown) of a hydraulic cylinder 103 provided at one end of a handle 104, and is attached to the handle 104 in a pair. A pressure lever 105 is provided.

In the case of such a compression device, as shown in FIG.
Thus, the electric wire W and the sleeve S are fixedly integrated.

[Problems to be solved by the invention] However, in such a compression device, it is necessary to operate the pressure lever 105 many times in order to compress the sleeve S from end to end, which makes the work complicated. However, it also has the drawback that it requires a lot of work time.

In addition, in this case, a ninth
As shown in the figure, it is necessary to provide a non-compressible part 12 of a certain length, and the work is carried out while visually measuring this interval, but since the work is carried out at the wire installation site, variations are likely to occur. If the spacing is too narrow, a reaction force will be applied to the compressed area, causing it to rise, and conversely, if the spacing is too wide, the number of compressions within the specified sleeve length will be reduced. In other words, the contact area between the wire and the sleeve becomes insufficient, and in any of the above cases, there is a risk that the desired connection strength will not be obtained.

In addition, between each compressed part 11 that applies a frictional force to the electric wire W, there is a non-compressed part 12 that does not come into contact with the electric wire W.
Therefore, in order to ensure an effective contact area that maintains a predetermined connection strength, a sleeve S with an extra length equal to the total length of the non-compressible portion 12 is used. Therefore, there was an inconvenience that the length of the sleeve S became unnecessarily long.

[Means for Solving the Problem] This invention was made to solve the above-mentioned problem, and a pair of compression rollers having sleeve compression grooves formed on the circumferential surface having the same cross-sectional shape, The compression rollers of one or both of the compression rollers are fixed to roller support shafts and arranged to face each other so as to be rotationally driven in opposite directions, and furthermore, in order to form a sleeve insertion portion in the opposing portion of the pair of compression rollers. A sleeve insertion notch surface that is a plane perpendicular to the front surface of the compression roller is formed in a part of the periphery, and the circumferential length of the inner wall surface of the sleeve compression groove excluding the sleeve insertion notch surface This is a compression device for a wire sleeve, which is selected to have a length equal to or greater than the length of the sleeve to be used.

[Operation] The opposing sleeve compression grooves of a pair of compression rollers that rotate in opposite directions continuously compress and mold the wire sleeve into a predetermined cross-sectional shape over its entire length. The compression molding of the sleeve by the compression roller is completed during one rotation of the compression roller.

[Embodiment] A first embodiment of the compression device according to this invention will be described with reference to FIGS. 1 to 3.

Reference numerals 3 and 4 indicate roller support shafts rotatably supported in parallel to each other within the casing, and one of the roller support shafts 3 is connected to a hydraulic motor 8 which is a drive source via a reduction gear 7. connected. A spur gear 5 is fixed to the middle of the roller support shaft 3 and meshes with a spur gear 6 fixed to the middle of the other roller support shaft 4 and having the same number of teeth. With the above-described configuration, the two roller support shafts 3 and 4 are driven to rotate in opposite directions at the same speed.

Compression rollers 1 and 2 are fixed to the ends of the mutually parallel roller support shafts 3 and 4, respectively, so that their front surfaces are on the same plane and their outer peripheral edges are opposed and substantially in contact with each other.

The compression rollers 1 and 2 each have a sleeve compression groove 1 whose cross section is approximately an isosceles trapezoid as shown in the figure.
A, 2A, and a part of the periphery is shaved off so as to form a sleeve insertion notch surface 9 that is a plane perpendicular to the front surfaces of the compression rollers 1 and 2, as clearly shown in FIG. ing. As shown in FIG. 1, the position of this sleeve insertion notch surface 9 is at a distance e in the radial direction from the outer peripheral edge, so that there is a width of 2e between the sleeve insertion notch surfaces 9 of both compression rollers 1 and 2. A sleeve insertion portion E is formed. This sleeve insertion part E is where the sleeve S inserted over the electric wire for compression molding is sandwiched between both compression rollers 1 and 2, so the above-mentioned interval 2e is smaller than the outer diameter of the sleeve S used. is also set slightly larger and is termed the sleeve insertion interval. In the drawings, the symbol E is used to indicate the sleeve insertion portion, and is also used as a numerical symbol to indicate the sleeve insertion interval (E=2e). The inner wall surfaces of the sleeve compression grooves 1A and 2A, which actually contribute to compression molding the sleeve S, are part of the arc ABC shown in FIGS. 1 and 3A. ] must naturally not be shorter than the length L of the sleeve S to be compressed.
That is, the circumferential length (arc length) M is equal to or longer than the length L of the sleeve S. In addition, the depth of these sleeve compression grooves 1A and 2A, that is, the height of the isosceles trapezoid cross-section of the groove, is 1/2 of the distance b between opposite sides of the hexagonal cross-section of the sleeve S after compression shown in FIG. They are equal.

In the first embodiment, the cross-sectional shape of each sleeve compression groove 1A, 2A is an isosceles trapezoid, but the cross-sectional shape is not limited to this, and may have a semicircular cross-section, for example. It is possible to take various other cross-sectional shapes.

The usage of the above-mentioned compression device is obvious from the explanation of the configuration so far, so it will be omitted, but the hydraulic motor 8
As a result, the sleeve S is continuously compressed over its entire length within the range of one revolution of the compression rollers 1 and 2 from the state shown in FIG. 1, and as shown in FIG. It crosses over and comes into close contact with the electric wire W.

Next, a second embodiment of the compression device according to this invention will be described with reference to FIG.

In this second embodiment, the radial distance from the outer peripheral edge of one compression roller 1 to the sleeve insertion notch 9 is c ₁ e (c 1 is a constant greater than 1 and less than 2), and the distance of the other compression roller 1 is c 1 e (c ₁ is a constant greater than 1 and less than 2). A similar distance for roller 2 is set to c ₂ e (c ₂ is a constant less than 1 and greater than 0), and the sum of those distances (c ₁ e + c ₂ e)
is set equal to 2e.

In other words, in this second embodiment, the position of the sleeve insertion part E is biased toward one compression roller 1 side, and therefore the width 2e is deeper than e on the compression roller 1 side and shallower than e on the compression roller 2 side. This can be understood as something that was originally written.

Further, FIG. 7 shows a third embodiment of the compression device according to this invention, and in this third embodiment, the sleeve insertion portion E having a width of 2e is further biased toward the compression roller 1 side. That is, the radial distance from the outer peripheral edge of the compression roller 1 to the sleeve insertion notch surface 9 is equal to the width 2e of the sleeve insertion portion E, and the other compression roller 2 is not formed with a sleeve insertion notch surface (i.e. c ₂ =0).

In the second and third embodiments, the circumference of arc ABC (arc long) is
It is obvious that it is necessary to satisfy the condition that the length L of the sleeve S to be compressed must be equal to or longer than that.

[Effects of the invention] As explained above, according to the electric wire sleeve compression device of this invention, the compression roller holding the sleeve therebetween rotates and moves over the entire length of the sleeve, thereby compressing the sleeve. Since the sleeve is compressed, the sleeve is compressed continuously over its entire length, which means that it is in uniform contact with the wire over its entire length, so even short sleeves can ensure strong connection strength. This makes it possible to shorten the length of the sleeve.

In addition, a sleeve is sandwiched between both compression rollers,
Since the entire length of the sleeve can be compressed in one operation of rotationally driving the compression roller, there is an advantage that the operation is simple and the work can be completed in a short time.

Further, a cutout surface for inserting a sleeve is formed in a part of the periphery of one or both of the compression rollers, and the cutout surface is a plane perpendicular to the front surface of the compression roller.
As a result, a sleeve insertion portion is formed between the pair of opposing compression rollers, so that it is extremely easy to insert the sleeve between the pair of compression rollers during compression molding.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the first embodiment of the compression device according to this invention, FIG. 2 is a side sectional view taken along the line - in FIG. 1, and FIG. 3A is a compression roller in FIGS. FIG. 3B is a side sectional view taken along the line -- in FIG. 3A, and FIG. FIG. 5 is a cross-sectional view taken along the line - in FIG. Front view similar to figure,
FIG. 8 is a side view showing a conventional compression device, and FIG. 9 is a longitudinal sectional view showing a sleeve compressed by the compression device shown in FIG. 1, 2...Compression roller, 1A, 2A...Sleeve compression groove, 3, 4...Roller support shaft, 9...Sleeve insertion notch surface, E...Sleeve insertion part, M...Perimeter of inner wall surface of sleeve compression groove (circular arc) long).

Claims (1)

[Claims for Utility Model Registration] 1. Sleeve compression groove 1A formed on the circumferential surface,
A pair of compression rollers 1 and 2 having the same cross-sectional shape of 2A are fixed to roller support shafts 3 and 4, respectively, and are disposed facing each other so as to be driven to rotate in opposite directions, and the pair of compression rollers 1 , 2 in order to form a sleeve insertion portion E at the opposing portion of either or both of the compression rollers 1 and 2.
A sleeve insertion cutout surface 9 that is a plane perpendicular to the front surface of the compression roller is formed on a part of the periphery of the compression roller, and the circumference of the inner wall surface of the sleeve compression groove excluding the sleeve insertion cutout surface 9. A compression device for a sleeve for electric wires, characterized in that M is selected to be equal to or longer than the length L of the sleeve S to be compressed. 2. The distance in the radial direction from the outer peripheral edge of the one compression roller 1 to the sleeve insertion notch surface 9 is c ₁ e (c ₁ : constant, e : 1/1 of the sleeve insertion interval).
2) The compression device for an electric wire sleeve according to claim 1, wherein a similar distance for the other compression roller 2 is c ₂ e (c ₂ : constant), and c ₁ =c ₂ =1. . 3. A claim characterized in that the constants c ₁ and c ₂ satisfy the relationship c ₁ + c ₂ = 2, and c ₁ > c ₂ (≠0) or c ₂ >c ₁ (≠0). Item 1. The electric wire sleeve compression device according to item 1. 4. The electric wire sleeve compression device according to claim ₁ , wherein the constants c 1 and _{c 2} satisfy the relationship c ₁ +c ₂ =2, and one of c ₁ and c ₂ is 0.