JP4183300B2 - Connecting device into the hole - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coupling device into a hole for fixing a working device or the like to an opening surface of a perforated portion, a cylindrical tube, a rectangular tube or the like.
[0002]
[Prior art]
As shown in FIG. 8, the conventional coupling device is inserted into a hole 11 with a columnar rubber block 12 that can be inserted and removed through a predetermined gap, and a shaft hole 12 a of the rubber block 12 so that the rubber block 12 is pulled out. An inner shaft 13 having a locking member 13a to be stopped, and a compression means for compressing the rubber block 12 via end plates 15 and 15, that is, a screw comprising a screw portion 13b of the inner shaft 13 and a nut 14 fitted thereto. The rubber block 12 is compressed through the end plates 15 and 15 by rotating the nut 14, and the outer peripheral surface is pressed against the inner surface of the hole 11 by the friction force. The shaft 12 is fixed in the hole 11.
[0003]
9, the end plates 25 and 25 are formed with conical pressure contact surfaces 25a and 25a, and the end surface of the rubber block 22 is also formed with tapered surfaces 22a and 22a along the pressure contact surface 25a. Is.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned conventional one converts the axial pressure into an expansion force in the outer circumferential direction (radially outward) and generates a coupling force by the friction force. The expansion force, the rubber blocks 12, 22 and The coupling force is determined by the friction coefficient of the inner surface of the hole 11. However, even if the axial length of the rubber blocks 12 and 22 is increased in order to increase the coupling force, the friction between the outer peripheral surface of the rubber blocks 12 and 22 and the inner surface of the hole 11 does not occur uniformly, and the coupling is not so much. There was a problem that power did not increase. This is because friction is generated between the inner shaft 13 and the inner surfaces of the shaft holes 12a and 22a of the rubber blocks 12 and 22, a loss occurs in the compressive force, and the compressive force decreases with increasing distance from the pressurizing position. This is because the expansion force decreases.
[0005]
Further, when the axial length of the rubber blocks 12 and 22 is increased, the deformation of the rubber blocks 12 and 22 is not easily returned due to residual friction even when the axial compressive force is loosened when the coupling is released. There was a problem that a large force was required to release the coupling device.
[0006]
An object of the present invention is to solve the above-mentioned problems and to provide a coupling device into a hole that can sufficiently obtain a coupling force and can be easily detached.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention externally fits a coupling ring group in which a plurality of sets of elastic rings and spacer rings are alternately arranged on an inner shaft member, the width of which is smaller than the outer diameter thereof. A compression means for compressing the coupling ring group in the axial direction, and at least one of the spacer ring and the elastic ring is a taper that biases the elastic ring toward the outer peripheral side when the elastic ring is compressed in the axial direction by the spacer ring. A surface is formed.
[0008]
According to the above configuration, when each elastic ring is pressed and compressed in the axial direction by each pair of spacer rings in the coupling ring group, the axial pressure applied to the elastic ring causes the taper surface to be compressed. By the so-called primary wedge action, the pressure is effectively converted into a pressing force directed toward the outer peripheral side. In addition, since the elastic ring has a small width, there is very little loss due to friction between the inner shaft member and the elastic ring, and each elastic ring is uniformly compressed and expanded and expanded to the outer peripheral side. The frictional force can be evenly generated between the two, and a large frictional force can be obtained in proportion to the number of the elastic rings, so that they can be combined well. In addition, each elastic ring has a small width and a small residual friction force, so that it easily returns from elastic deformation and can be easily detached from the hole with a small separation force.
[0009]
According to a second aspect of the present invention, in the configuration of the first aspect, the elastic ring is made of hard synthetic rubber, and a space between the outer peripheral end surface of the spacer ring and the inner surface of the hole is provided in the spacer ring. An acute angle space narrowing from the axial end surface of the inner shaft member toward the axial center of the inner shaft member of the spacer ring is formed .
[0010]
According to the above configuration, the elastic ring compressed through the tapered surface by the spacer ring enters the acute angle space formed between the inner surface of the hole and the outer end surface of the spacer ring , and the elastic ring is particularly hard. Since it is made of synthetic rubber, the inserted elastic ring exhibits a very effective secondary wedge effect, and the inner shaft member and the hole are firmly coupled.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of a coupling device according to the present invention will be described with reference to FIGS.
[0012]
As shown in FIG. 1, this coupling device is attached to the tip of a leg arm of a work robot that moves along, for example, a wall surface 2 in which a large number of holes 1 are formed or a wall surface in which a large number of tubes are opened. Thus, the coupling ring group 4 is externally fitted to the distal end portion of the inner shaft member 3 moved by the driving device while being prevented from coming off by the stopper 3a at the distal end portion. In this coupling ring group 4, a hard rubber ring 5 that is an elastic ring and a metal or resin spacer ring 6 are alternately arranged in a plurality of sets (four in the drawing), and at the end hard rubber ring 5 A spacer ring 6 is added, and each hard rubber ring 5 is disposed between the spacer rings 6. A compression cylinder member 7 for compressing the coupling ring group 4 between the coupling ring group 4 and the stopper 3a in the axial direction is externally slidably fitted to the inner shaft member. 7 and an actuator (not shown) such as a hydraulic cylinder device that drives the shaft 7 in the axial direction constitute a compression means.
[0013]
As shown in FIG. 2, the hard rubber ring 5 is made of hard synthetic rubber and has a rectangular cross section, and its width W1 is set in a range of an outer diameter D × 0.05 to 0.50. When W1 is less than D × 0.05, the strength of the hard rubber ring is not guaranteed, the pressure contact surface is small, and the cost increases if the number of mounted parts is increased to secure the pressure contact surface. On the other hand, if W1 exceeds D × 0.50, the frictional force between the inner shaft member 3 and the inner surface 1a of the hard rubber ring 5 increases and is not uniformly compressed in the axial direction, and the frictional force is obtained efficiently. It is because it is not possible.
[0014]
The spacer ring 6 has an outer peripheral surface (end surface on the outer peripheral side) 6b which is an upper side and a lower side of a cross section along the axial direction formed in a long arcuate convex shape, and extends from the end surface in the axial direction to the central portion. It is configured to form an acute angle space with the inner surface of the hole 1, and the lower part (inner peripheral part) has a trapezoidal cross section, and its width W2≈W1 or smaller than W1, It is comprised so that the expansion | swelling tolerance space of the rubber ring 5 may be ensured. Further, both end surfaces are formed on the pressure-side tapered surface 6a that expands toward the axial center side.
[0015]
Further, the hard synthetic rubber is used for the hard rubber ring 5 because the applied pressure transmitted from the pressure side taper surface 6a of the spacer ring 6 is changed to a so-called primary wedge action (the change of the force generated by the taper surface in the same manner as the wedge). 4), the outer peripheral surface 6b of the spacer ring 6 and the inner periphery of the hole 1 are pressed by the hard rubber ring 5 as shown in FIG. This is because the secondary wedge effect generated by entering the acute angle space C formed by the surface is more effectively exhibited. Here, “hard” in the synthetic rubber means hardness (JIS) of 60 or more, and “soft” means hardness of less than 60.
[0016]
In the above configuration, when the compression cylinder member 7 is advanced forward and the coupling ring group 4 is pressurized in the axial direction, as shown in FIG. 3, the primary wedge action by the pressure side taper surface 6a of the spacer ring 6 is achieved. Thus, the applied pressure is efficiently converted into a pressure contact force directed to the outer peripheral side, and each hard rubber ring 5 expands to the outer peripheral side by elastic deformation due to pressurizing action, and the outer peripheral surface of each hard rubber ring 5 is the hole 1. Are uniformly pressed against the inner surface 1a and firmly fixed by the frictional force. At this time, since the width W1 of the hard rubber ring 5 is small, the loss due to the frictional force between the inner surface of the hard rubber ring 5 and the inner shaft member 3 is extremely small, and the frictional force is evenly generated in each hard rubber ring 5. At this time, as shown in FIG. 4, since the outer peripheral surface 6 b of the spacer ring 6 is formed in an arcuate convex cross section, a part of the hard rubber ring 5 is formed between the outer peripheral portion of the spacer ring 6 and the hole 1. Since it enters the acute angle space C formed with the inner surface 1a and exhibits a secondary wedge effect, and the rubber ring 6 is still hard, the secondary wedge effect acts more effectively, and the inner shaft member 3 It is very firmly fixed in the hole 1.
[0017]
Further, when the compression cylinder member 7 is retracted and the compression of the coupling ring group 4 is released, each hard rubber ring 5 quickly returns to its original state, and the connection to the inner surface 1a of the hole 1 is released. Therefore, the separation from the hole 1 can be easily performed with a small force.
[0018]
According to the above configuration, when the tapered surface 6 a of the spacer ring 6 is pressed against both end surfaces of the hard rubber ring 5, the hard rubber ring 5 is pressed more strongly against the inner surface 1 a of the hole 1 by the pressure contact force due to the primary wedge action. By arranging a plurality of sets of the hard rubber ring 5 and the spacer ring 6 in parallel, the pressure contact force due to the wedge action is generated uniformly by the number of the hard rubber rings 5 and the spacer rings 6 so that they can be firmly coupled. Further, in the conventional device, when the hardness of the hard rubber ring 5 is increased, the bonding force is reduced. However, in the device of the present invention, since the pressure contact force due to the wedge action is large, the higher the hardness of the hard rubber ring 5 is, the higher the bonding force is obtained. It is done. (The conventional rubber block has low hardness.)
Further, when the hard rubber ring 5 is elastically deformed so as to spread to the outer peripheral side by the pressurizing action by the compression cylinder member 7, the width W1 of the hard rubber ring is small, so that the friction between the hard rubber ring 5 and the inner shaft member 3 is caused. Loss is small and easily deforms in the outer circumferential direction. Therefore, a frictional force due to elastic deformation of the hard rubber ring 5 is effectively generated, and a large coupling force is obtained. Furthermore, a large bonding force can be obtained in proportion to the number of the hard rubber rings 5.
[0019]
Furthermore, the outer peripheral surface 6b of the spacer ring 6 is formed in an arcuate convex cross section 6b, and a part of the hard rubber ring 5 is formed into an acute angle space C formed by the outer peripheral portion of the spacer ring 6 and the inner surface 1a of the hole 1. By being inserted, the secondary wedge effect can be exerted, and since the rubber ring 6 is still hard, the secondary wedge effect acts more effectively, and the inner shaft member 3 is extremely inserted into the hole 1. It can be firmly fixed.
[0020]
In the above embodiment, the pressure side taper surface 6a is formed on the spacer ring 6, but the pressure side taper surface 5a may be provided on the hard rubber ring 5 as shown in FIG. 5, and as shown in FIG. Further, the pressure side taper surface 5 a and the pressure receiving side taper surface 6 a may be formed on both the hard rubber ring 5 and the spacer ring 6.
[0021]
Furthermore, although the shape of the outer peripheral surface 6b of the spacer ring 6 is an arcuate convex cross section, an acute angle space C that narrows from the hard rubber ring 5 side toward the spacer ring 6 can be formed between the inner surface 1a of the hole 1. For example, as shown in FIG. 7, it may be a mountain-shaped cross section having a tapered surface 6c.
[0022]
Further, the compression means is composed of the compression cylinder member 7 and its actuator. However, the compression cylinder member 7 may be fixed and the inner shaft member 3 may be driven in the axial direction by the actuator. You may drive the member 3 and the compression cylinder member 7 to a relative direction, respectively.
[0023]
Further, although the elastic ring is made of synthetic rubber, it may be formed of a hard resin having appropriate elasticity.
Furthermore, although the hole 1 has a circular cross section, the inner shaft member 3 is formed as a prism having a similar shape to the cross section of the hole 1 even in the case of a rectangular cross section, and the hard rubber ring 5 and the spacer ring 6 are formed in a rectangular tube shape. do it.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, when each elastic ring is pressed in the axial direction and compressed by each pair of spacer rings of the coupling ring group, the elastic ring The applied pressure in the axial direction is effectively converted into a pressing force directed toward the outer peripheral side by a so-called primary wedge action through the tapered surface. In addition, since the elastic ring has a small width, there is very little loss due to friction between the inner shaft member and the elastic ring, and each elastic ring is uniformly compressed and expanded and expanded on the outer peripheral side. A frictional force can be evenly generated between the inner surface and the inner surface, and a large frictional force can be obtained in proportion to the number of elastic rings, which can be combined well. In addition, each elastic ring has a small width and a small residual friction force, so that it easily returns from elastic deformation and can be easily detached from the hole with a small separation force.
[0025]
According to the second aspect of the invention, the resilient ring is compressed via the tapered surface by a spacer ring, it enters the acute angle space formed between the outer peripheral end face of the inner surface and the spacer ring of holes In particular, since the elastic ring is made of hard synthetic rubber, the inserted elastic ring exhibits a very effective secondary wedge effect, and the inner shaft member and the hole are firmly bonded.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a coupling device according to the present invention.
FIG. 2 is an enlarged sectional view of a hard rubber ring and a spacer ring of the same device.
FIG. 3 is an enlarged cross-sectional view of a hard rubber ring and a spacer ring showing a state of the apparatus when pressurized.
FIG. 4 is an enlarged cross-sectional view for explaining a secondary wedge effect of a hard rubber ring and a spacer ring of the same device.
FIG. 5 is an enlarged cross-sectional view showing another embodiment of a hard rubber ring and a spacer ring.
FIG. 6 is an enlarged cross-sectional view showing another embodiment of a hard rubber ring and a spacer ring.
FIG. 7 is an enlarged cross-sectional view showing another embodiment of the spacer ring.
FIG. 8 is a longitudinal sectional view showing a conventional coupling device.
FIG. 9 is a longitudinal sectional view showing another conventional coupling device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hole 1a Inner surface 3 Inner shaft member 3a Stopper 4 Coupling ring group 5 Hard rubber ring 5a Pressure receiving side taper surface 5b Outer surface 6 Spacer ring 6a Pressure side taper surface 6b Outer surface 6c Tapered surface 7 Compression cylinder member W1 Width D Outer diameter

Claims (2)

The inner ring member is externally fitted with a coupling ring group in which the width is smaller than the outer diameter and a plurality of elastic rings and spacer rings are alternately arranged,
A compression means for compressing the coupling ring group in the axial direction;
A coupling device into a hole, wherein at least one of the spacer ring and the elastic ring is formed with a tapered surface that urges the elastic ring toward the outer peripheral side when the elastic ring is compressed in the axial direction by the spacer ring. The elastic ring is made of hard synthetic rubber,
The space between the outer peripheral end surface of the spacer ring and the inner surface of the hole is narrowed from the axial end surface of the inner shaft member of the spacer ring toward the axial center of the inner shaft member of the spacer ring. 2. The device for coupling into a hole according to claim 1, wherein the device is configured to form an acute angle space .

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