JPH08164060A - Prop device - Google Patents

Abstract

PURPOSE: To provide a prop device capable of securing and reinforcing fixing between inner and outer tubes, showing the prop function, easily adjusting the prop strength and preventing damages on prop meeting faces. CONSTITUTION: This prop device is equipped with inner and outer tubes 2 and 3 extensible in the axis direction, a fixing tool 4 for tubes 2 and 3, and a pressing tool 5 to give pressing force to tubes 2 and 3. The fixing tool 4 comprises a inserted material 7 to be outward inserted by the outer tube end, a fastening inserting material 8 slidably outward inserted to the inner tube 2, and a fastening outer tube 9 outward fitting to the fitting material 8, and the inserting faces of both inserting materials 8 and 9 are to be eccentric faces 14 and 21. By rotating the fastening outer tube 9, the fastening inserting material 8 is reduced in the diameter via the eccentric faces 14 and 21 to make the whole inner face strongly contact and fix to the outer face of the inner tube 2, and to make the diameter of the fastening inserting material 8 reduced via a taper inserting 11 and 15 between the inserted material 7 and the fastening inserting material 8 to strongly contact and fix the whole inner face to the outer periphery face of the inner tube 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioning device for thrusting and supporting between fixed facing surfaces facing each other, for example, a goodwill rod, a curtain pole, a clothes rod, a stretch shelf, and a stretch strut. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a tensioning device of this type, a set of inner and outer pipes which are expandable and contractible in the axial direction, a fixing device for fixing the inner and outer pipes, and an axial direction for the inner and outer pipes are provided. It is known to have a pressing device that applies a pressing force, and to extend and support the inner and outer pipes arranged between the facing surfaces facing each other (for example, Japanese Utility Model Publication No. 3-35171). (See the official gazette).

The fixing device for the tensioning device has a cylindrical fitting member fitted on the end of the outer pipe and an outer pipe slidable in the axial direction on the inner pipe inserted through the fitting member. A tapered portion having a small diameter tip is formed on the outer circumference of a portion of the fitted member into which the inner tube is inserted, and the fitted member faces the tapered portion. Thus, the tapered hole is provided, and the tapered hole is inclined so as to intersect the axis of the inner and outer tubes.

Therefore, by rotating the fitted member with respect to the fitting member, the fitted member is clamped and fixed to the inner pipe via the fitting member, and the inner pipe slides axially with respect to the outer pipe. It doesn't move. Further, the pressing device is a ring-shaped plug body fitted with a nut member fixed to the outer end of the inner pipe, and a grip portion fitted to the ring and the outer end of the inner pipe so as to be slidable in the axial direction. The grip portion includes a threaded rod having one end fixed to the grip portion and the other end side fitted with the nut member, and a tension contact member fixed to the outer end of the grip portion. The grip portion is movable in the axial direction with respect to the inner pipe.

[0005]

By the way, in the above-mentioned fixing device, since the tightening force is applied by the elastic force due to the member to be fitted being bent in the radial direction, the tightening force is applied through the fitting member. Acting only on a part of the outer peripheral surface of the inner tube.
Therefore, there is a problem that a sufficient tightening force cannot be obtained and the pressing force acts in the axial direction by the pressing device so that the pressing device is easily loosened and the inner and outer pipes cannot be reliably fixed.

Further, in the conventional pressing device, since the pressing force in the axial direction is applied by the screw mechanism, the thrust strength cannot be adjusted and the thrust facing surface may be damaged. There is. The present invention has been made in view of the actual situation as described above, and the purpose thereof is to reliably and firmly fix the inner and outer pipes and to exert a bulging function without loosening, and also to achieve a bulging strength of It is an object of the present invention to provide a tensioning device that is easy to adjust and does not damage the opposing surface of the tensioning device.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is, the first
The invention has an inner and outer tube that is expandable and contractible in the axial direction, a fixing device that fixes expansion and contraction of the inner and outer tubes, and a pressing device that applies a pressing force in the axial direction to the inner and outer tubes. In the tensioning device for extending and supporting the inner and outer pipes, the fixing device is fitted to one end of the outer pipe while being restrained from moving toward the other end. Wood and
Tightening fitting material engaged with an end of the fitted material and externally fitted to the inner pipe so as to be axially movable, and tightening rotatably fitted to the fastening fitting material. An outer cylinder is formed, and the outer peripheral surface of the tightening fitting and the inner surface of the tightening outer sleeve are formed as eccentric surfaces, and the tightening outer sleeve is rotated to tighten the inner pipe. , Is configured to prevent relative movement in the axial direction between the tightening fitting material and the inner pipe, and a tapered hole is provided at an end portion of the fitted material, and an end portion of the tightening fitting material is formed. Is provided with a taper fitting portion that fits into the taper hole, and when the taper fitting between the taper hole and the taper fitting portion becomes strong, the taper fitting portion is reduced in diameter to form an inner pipe. It is characterized in that the relative movement in the axial direction is prevented.

The tightening fitting material is formed by cutting a peripheral wall of a cylindrical body along its entire length in the axial direction, and the outer peripheral surface of the tightening fitting material is axially intermediate from the center of the cut portion. It is an eccentric surface that is anti-symmetric with respect to the plane passing through the heart,
It is preferable that the inner surface of the tightening outer cylinder externally fitted to the tightening fitting material is an eccentric surface corresponding to the outer peripheral eccentric surface of the tightening fitting material.

Mutual detent means are preferably provided on the tapered hole of the mating member and the outer peripheral surface of the tightening mating member. . A reduced diameter portion is provided on the outer periphery of the tightening fitting body on the opposite side of the tapered fitting portion and in the vicinity of the eccentric surface, and an end surface cam is provided on the axial end surface on the eccentric surface side. It is preferable to provide an end face cam corresponding to the end face cam on the inner peripheral portion.

A second aspect of the present invention has an inner and outer tube that is expandable and contractible in the axial direction, a fixing device that fixes the inner and outer tubes, and a pressing device that applies a pressing force in the axial direction to the inner and outer tubes. In a projecting device adapted to stretch and support the inner and outer pipes arranged between the surfaces, the pressing device is fitted to the outer end of the inner or outer pipe, and has a threaded support member. A support cylinder having a threaded portion that is screwed into the threaded portion of the support member and is movable in the axial direction; and an outer end portion of the support cylinder that is axially movable via an elastic body. And a strut contact member.

It is preferable that the contact member is externally fitted to the support cylinder via a spring receiving cylinder. It is preferable to provide a pressing strength display means for displaying the pressing strength against the facing surface by the contact member and the support cylinder.

[0012]

According to the present invention, the inner and outer pipes are extended so as to come into contact with the opposing fixed surfaces, and the tapered fitting portion of the fastening fitting material of the fixing device is inserted into the tapered hole of the fitted material. After that, by rotating the tightening outer cylinder by a predetermined angle in one direction, the eccentric surface of the outer circumference of the tightening fitting and the inner circumference of the tightening fitting reduces the diameter of the tightening fitting and reduces the inner circumference of the fitting fitting. The whole is in close contact with the outer peripheral surface of the inner pipe, a sufficient tightening force is secured, the tightening fitting material is firmly fixed to the outer pipe, and the inner and outer pipes are temporarily fixed between the facing surfaces.

By pressing the inner and outer pipes in the axial direction by operating the pressing device, the taper fitting between the fitted material and the tightening fitting material is strengthened, and the relative movement of the inner and outer tubes is completely prevented. As a result, the pressing force of the pressing device increases, and the inner and outer tubes are fixed between the opposing wall surfaces. The fitted material and the tightening fitting material are mutually locked by the rotation preventing means, and the tightening fitting material does not rotate due to the rotation of the tightening outer cylinder, so that the fixing operation is easy.

Further, the thrust contact member of the pressing device is
The support outer cylinder is pressed against the opposing surface by the elastic force of an elastic body such as a coil spring, and by rotating the support outer cylinder, the support outer cylinder moves in the axial direction with respect to the support material fitted on the inner pipe. Since the elastic force of the elastic body changes, the tensile strength can be adjusted arbitrarily. Then, looking at the pressing strength instructing means composed of the strut contact member and the supporting outer cylinder,
By adjusting the adhesion strength according to the material of the facing surface,
It is possible to prevent the opposite surface from being scratched.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 is a thrusting device, in which an inner tube 2 is inserted into an outer tube 3 so as to be able to expand and contract in the axial direction, the inner and outer tubes 2, 3 are fixed by a fixing device 4, and a pressing force in the axial direction by a pressing device 5. Is provided, and the pressing device 5
Is provided at the outer end of the inner pipe 2, and the abutting member 6 made of soft rubber or synthetic resin is fitted on the outer end 3A of the outer pipe 3. The inner and outer tubes 2 and 3 may be made of metal or hard synthetic resin.

The fixing device 4 is made of a synthetic resin, and has a cylindrical fitting member 7 externally fitted to the inner end 3B of the outer pipe 3 and a tightening fitting slidably fitted to the inner pipe 2. It is composed of a composite material 8 and a tightening outer cylinder 9 which is fitted onto the fitting material 8 so as to be slidable and rotatable in the axial direction. The fitted material 7 is, as shown in FIGS.
The inner surface is provided with an outer tube fitting portion 10 at one end in the axial direction, and the other end is provided with a tightening material receiving portion 11 formed of a tapered hole that is widened toward the outer end. A detent projection 12 that constitutes a detent means is symmetrically provided on the detent 11, and the inner tube 2 can be inserted into and removed from the outer tube fitting section 10 from the receiving section 11 side.

As shown in FIGS. 6 to 14, the fastening fitting member 8 is formed by cutting the peripheral wall of the cylindrical body along the entire length in the axial direction thereof and providing the cutting portion 13. The cutting portion 13 is provided. This facilitates the reduction of the inner diameter. The fastening fitting member 8 has eccentric surfaces 14, 14 that are antisymmetric with respect to a plane passing through the axis from the center of the cutout 13 at the axially intermediate portion of the outer peripheral surface thereof. Surface 14
The center point C1 is eccentric H with respect to the center CO of the fastening fitting material 8 in the direction of the incision 13 and the opposite direction, and has the same radius of curvature R.

Further, the outer peripheral surface of one end of the tightening fitting material 8 in the axial direction is a tapered fitting portion 15, and the fitted material 7 is
The fitting fitting receiving portion 11, that is, the tapered hole, can be fitted, and the outer peripheral surface of the other end portion in the axial direction is reduced in diameter adjacent to the eccentric surface 14, and the eccentric portion 16 is eccentric. Propulsion end surface cams 17, 17 for moving the fastening fitting 8 in the axial direction are provided on the end surface on the side of the surface 14, and an interrupt cutout portion is provided on the peripheral wall on the opposite side of the cutout portion 13 from both axial end portions to the eccentric surface 14 side. 1
8 and 19 are provided so that the notches 18 and 19 between the two cutouts 18 and 19 can be easily bent so that the entire inner surface of the fastening fitting material 8 is in close contact with the outer peripheral surface of the inner tube 2. Further, a cutout portion 16A in the circumferential direction is provided so that a part of the reduced diameter portion 16 remains, and the reduced diameter portion 1
6 is easily bent in the radial direction, and the tightening outer cylinder 9 is easily fitted on the outer circumference.

As shown in FIG. 9, an annular small projection 20 is provided on the inner peripheral edge of the tightening fitting member 8 on the fitting portion 15 side so as to extend to the outer peripheral surface of the inner pipe 2. The crimpability is improved. Further, the rotation preventing projections 12 of the fitted material 7 are fitted and engaged with the cutout portions 13 and the cutout portions 18 of the tightening fitting material 8 so as not to rotate with each other. The cutout portion 13 and the cutout portion 18 constitute a rotation stopping means.

As shown in FIGS. 15 to 18, the tightening outer cylinder 9 is made of a cylindrical body, and the inner peripheral surface of the tightening outer cylinder 9 is provided on the eccentric surface 14 of the fitting member 8 except both ends in the axial direction. Correspondingly, the eccentric surfaces 21, 21 are formed around a point C1 eccentric to the center C by the same eccentric amount H as that of the eccentric surface 14, and the radius of curvature R of the eccentric surface 21 is also the eccentric surface 14. Has the same radius of curvature as the eccentric surface 21.
It is designed to be fitted on the No.

Further, one end of the tightening outer cylinder 9 has an inner peripheral side,
An inward flange 22 that can be externally fitted to the reduced diameter portion 16 of the fitting member 8 is provided, and an end surface cam 23 corresponding to the end surface cam 17 is provided at an inner end surface of the flange 22. Engages with the cam 17 and rotates the tightening outer cylinder 9, thereby pushing the tightening fitting material 8 into the receiving portion 11 of the fitted material 7 by the cams 17 and 23 on both end surfaces. Is able to.

A groove 24 parallel to the axial direction is provided at one end portion of the outer peripheral surface of the tightening outer cylinder 9 in the axial direction so that the tightening outer cylinder 9 can be easily rotated, and the other end portion thereof is provided. A display concave portion 25 that indicates the circumferential end of the eccentric surface 21 is provided. As shown in FIGS. 19 to 24, the pressing device 5 is screwed to the support member 27 having the male screw portion 26 on the outer periphery fitted on the outer end 2 </ b> A of the inner tube 2 and the male screw portion 26. Female thread 28
A support outer cylinder 29 having a spring, a spring cylinder 30 externally fitted to the tip of the support outer cylinder 29, a pressing coil spring 31 as an elastic body fitted in the spring cylinder 30 and a spring cylinder 30. It is composed of a tension contact member 32 which is movably fitted to the outside.

The support member 27 is made of a hard synthetic resin, and as shown in FIG. 20, one end in the axial direction is bulged to form an inner pipe fitting portion 33, and an intermediate portion is connected to the inner pipe fitting portion 33. The male screw portion 26 is provided, and the distal end side of the male screw portion 26 is a reduced diameter portion 34, and one end of the coil spring 31 is externally fitted and supported on the distal end of the reduced diameter portion 34. Further, the supporting outer cylinder 29 is made of a hard synthetic resin, and as shown in FIGS. 21 and 22, is provided with a large-diameter fitting portion 35 fitted to the fitting portion 33 of the supporting member 27. The female threaded portion 28 that is screwed into the male threaded portion 26 is provided following the inner peripheral surface of the large fitting portion 35, and the distal end side of the female threaded portion 28 is reduced in diameter to form a support material fitting portion 36. An annular protrusion 37 for locking the spring cylinder is provided on the outer peripheral surface of the spring cylinder, and a plurality of anti-slip recesses 38 are provided on the outer peripheral surface of the central portion in the axial direction.

The spring cylinder 30 is made of a hard synthetic resin and has a bottomed cylinder shape as shown in FIGS. 23 and 24. A plurality of locking projections 39 are provided on the inner peripheral surface of the open end of the spring cylinder 30. A mold removal hole 40 that forms the locking projection 39 is formed in the. The strut contact member 32 is made of soft rubber or synthetic resin, has a bottomed tubular shape as shown in FIG.
The bottom surface, that is, the contact surface 41 to the fixed facing surface W is recessed in a spherical shape, and a scale 42 (strong / medium / weak) indicating the adhesion strength is engraved on the opposite side of the contact surface 41. The pressing strength display plate 43 is extended in the axial direction.

The graduation 42 can be adjusted in pressure strength according to the material of the facing surface W by aligning with the end surface 44 of the central portion end surface 44 of the supporting outer cylinder 29 as an instruction reference. It is like this. That is, by rotating the support outer cylinder 29, the support outer cylinder 29 moves in the axial direction, the distance S between the support outer cylinder 29 and the spring cylinder 30 changes, and the spring force (pressing force) of the coil spring 31 changes. , The thrust strength can be adjusted arbitrarily.

In the above embodiment, when the thrust device 1 is mounted between the opposed vertical wall surfaces W, for example, first, the fixing device 4 of the thrust device 1 assembled as shown in FIG. The cylinder 9 is rotated and loosened to release the fixation, and the contact members 6 and 32 are extended until they come into contact with the wall surface W, and the tapered fitting portion of the fastening fitting material 8 of the fixing device 4 is also provided. After inserting 15 into the receiving portion 11 formed of the tapered hole of the fitted material 7 so that the rotation preventing projection 12 fits into the cutout portion 13 and the cutout portion 18, the tightening outer cylinder 9 is rotated. The eccentric surfaces 14 and 21 reduce the diameter of the tightening fitting material 8 to tightly fix the entire inner surface of the tightening fitting material 8 to the outer peripheral surface of the inner pipe 2.

At this time, the end surface cam 23 of the tightening outer cylinder 9 comes into contact with the end surface cam 17 of the tightening fitting material 8 and rotates, so that FIG.
, The gap L1 between them becomes small, the distance L2 between the end faces of the fitted material 7 and the tightening fitting material 8 becomes large, and the fitted material 7 and the tightening fitting material 8 by the pressing device 5, which will be described next, Secure the taper fitting margin. Further, since the anti-rotation projection 12 is fitted and engaged with the cutout portion 13 and the cutout portion 18, the fastening fitting material 8 does not rotate together with the fastening outer cylinder 9, and the fixing operation is performed reliably. be able to.

After the above-mentioned temporary mounting is completed, the pressing device 5 is used for the permanent mounting. That is, the pressing device 5 is the same as that shown in FIG.
And, as shown in FIG. 19, the elastic force of the coil spring 31 presses the thrust contact member 32 against the wall surface W, and the inner and outer pipes 2, 2.
3 is held. Therefore, by rotating the support outer cylinder 29, the support outer cylinder 29 moves in the axial direction with respect to the support material 27, the interval S changes, and the elastic force of the coil spring 31 changes. Therefore, by adjusting the end surface 44 of the support outer cylinder 29 to the scale 42 of the pressing strength display plate 43 in accordance with the material of the wall surface W, it is possible to adjust the urging strength optimum for the material of the wall surface W.

The axial force generated by the pressing device 5 is fixed by the fixing device 4.
Since the taper fitting between the fastening fitting material receiving portion 11 and the taper fitting portion 15 formed of the taper hole is strengthened, the fastening fitting material 8
The inner diameter of is reduced, and the inner tube 2 is strongly tightened and fixed to support the axial force. However, the thrust device 1 is firmly fixed between the fixed opposing wall surfaces W. In the above embodiment, the tightening outer cylinder 9 can be loosened to move the tightening fitting member 8 with respect to the inner pipe 2, so that the total length of the inner and outer pipes 2 and 3 can be easily adjusted.

Then, the tightening fitting member 8 is temporarily fixed to the inner pipe 2 by the turning of the tightening outer cylinder 9, and then the taper fitting of the fixing device 4 is strengthened by the axial force of the pressing device 5. Since the fitted fitting member 8 is securely fixed to the inner pipe 2 to support the axial force, a firm mounting is possible. At the time of fixing, since it does not have a fixing screw protruding in the radial direction unlike the conventional case, when used for a curtain rail or the like, there is no protrusion to be caught,
The hook can be moved easily.

Further, in the pressing device 5, since the elastic force of the coil spring 31 is used, the pressing force is softer than that of the conventional axial force generating device using a screw, so that damage of the wall or the like due to excessive tightening occurs. Absent. The present invention is not limited to the above-described embodiments, and can be modified in design as appropriate. In addition, the tensioning device 1 can be incorporated in a shelf, and a goodwill rod, a curtain pole, a clothes rod, and a thruster. It can be used for columns and the like.

[0032]

According to the first aspect of the present invention, the entire inner surface of the tightening fitting material is strongly brought into close contact with the outer peripheral surface of the inner tube to secure a sufficient tightening force to firmly fix the inner and outer tubes. It is possible to sufficiently exert the tensile strength without loosening due to the pressing force of the pressing device. Further, according to the second aspect of the present invention, the pressing force is applied through the elastic body, the bulging strength can be arbitrarily adjusted, and damage to the facing surface by the contact member can be prevented.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an essential part of the first embodiment of the invention.

FIG. 3 is a central longitudinal sectional view of the first embodiment of the invention.

FIG. 4 is a vertical cross-sectional view of a mating member of the embodiment.

FIG. 5 is a right side view of FIG.

FIG. 6 is a front view of the fastening fitting material according to the embodiment.

FIG. 7 is a front view of FIG.

FIG. 8 is a partially cutaway view of FIG.

9 is an enlarged view of part A in FIG.

10 is a left side view of FIG. 7. FIG.

11 is a right side view of FIG. 7. FIG.

12 is a sectional view taken along line BB of FIG.

13 is a cross-sectional view taken along the line CC of FIG.

14 is a cross-sectional view taken along the line DD of FIG.

FIG. 15 is a front view of the tightening outer cylinder of the embodiment.

16 is a left side view of FIG.

17 is a sectional view taken along line EE of FIG.

FIG. 18 is a sectional view taken along line FF of FIG.

FIG. 19 is a partially cutaway front view showing a main part of the embodiment of the second invention.

FIG. 20 is a partially cutaway front view of the support material of the example.

FIG. 21 is a partially cutaway front view of the supporting outer cylinder of the embodiment.

22 is a sectional view taken along line GG of FIG.

FIG. 23 is a partially cutaway front view of the spring cylinder of the embodiment.

FIG. 24 is a left side view of FIG. 23.

[Explanation of symbols]

 1 Stretching device 2 Inner pipe 3 Outer pipe 4 Fixing device 5 Pressing device 6 Abutting member 7 Fitting material 8 Tightening fitting material 9 Tightening outer cylinder 11 Tightening fitting material receiving part (tapered hole) 12 around Stop projection 13 Cutout portion 14 Eccentric surface 15 Tapered fitting portion 16 Reduced diameter portion 17 End surface cam 18 Notch portion 21 Eccentric surface 23 End surface cam 26 Male screw 27 Support material 28 Female screw 29 Support outer cylinder 30 Spring cylinder 31 Coil spring (elastic body) 32 Strut abutting member 42 Scale 43 Pressing strength display plate 44 End surface W Opposing surface

Claims (7)

[Claims] 1. An inner and outer tube that is expandable and contractible in the axial direction, a fixing device that fixes expansion and contraction of the inner and outer tubes, and a pressing device that applies a pressing force in the axial direction to the inner and outer tubes. In the projecting device configured to extend and support the inner and outer pipes arranged on the outer pipe, the fixing device is fitted to the outer pipe by restraining the movement of the outer pipe toward the other end. A fitting member, a tightening fitting member that engages with an end portion of the fitted member and is fitted onto the inner pipe so as to be axially movable, and an outer member that is rotatable around the fitting member. The tightening outer cylinder is fitted, and the outer peripheral surface of the tightening fitting member and the inner surface of the tightening outer member are formed as eccentric surfaces. The inner pipe is configured to be tightened to prevent relative movement in the axial direction between the tightening fitting material and the inner pipe, and a tapered hole is provided at an end of the fitted material, A taper fitting portion that fits into the taper hole is provided at an end portion of the fastening fitting material, and when the taper fitting between the taper hole and the taper fitting portion becomes strong, the taper fitting portion shrinks. A projecting device having a diameter so as to prevent relative movement in the axial direction with the inner pipe. 2. The fastening fitting material is obtained by cutting a peripheral wall of a tubular body along its entire length in the axial direction, and an outer peripheral surface of the fastening fitting material is located at an intermediate portion in the axial direction from a center of the cut portion. It is an eccentric surface that is anti-symmetric with respect to the plane passing through the axis,
The protrusion according to claim 1, wherein an inner surface of the tightening outer cylinder externally fitted to the tightening fitting material is an eccentric surface corresponding to an outer peripheral eccentric surface of the tightening fitting material. apparatus. 3. The tensioning device according to claim 1, wherein a mutual rotation preventing means is provided on the tapered hole of the fitted material and the outer peripheral surface of the fastening fitting material. 4. A reduced diameter portion is provided on the outer periphery of the tightening fitting body on the side opposite to the tapered fitting portion and close to the eccentric surface, and an end surface cam is provided on the axial end surface on the eccentric surface side. The thrust device according to any one of claims 1 to 3, wherein an end surface cam is provided on an inner peripheral portion of the tightening outer cylinder so as to correspond to the end surface cam. 5. An inner and outer tube that is expandable and contractible in the axial direction, a fixing device that fixes the inner and outer tubes, and a pressing device that applies a pressing force in the axial direction to the inner and outer tubes. In the tensioning device for extending and stretching the inner and outer tubes to support them, the pressing device is fitted to the outer end of the inner or outer tube, and has a threaded support member, and the support material. A support cylinder having a threaded portion that is screwed into the threaded portion and is movable in the axial direction,
A projecting and abutting member which is locked to an outer end portion of the support cylinder via an elastic body so as to be movable in the axial direction. 6. The tensioning device according to claim 5, wherein the contact member is externally fitted to the support cylinder via a spring receiving cylinder. 7. The thrust device according to claim 5, further comprising a pressing strength display means for displaying a pressing strength to the facing surface by the contact member and the support cylinder.