JP2014126161A - Braking and locking mechanism of vertically extending telescopic strut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a braking and locking mechanism that enables applying the brakes and also locking in the vertical telescopic motion of the vertically extending telescopic strut.SOLUTION: A vertically extending telescopic strut comprises a support tube 11, a connection part 20 at the upper end thereof, and a telescopic rod 15 stored in the inside of these. The connection part 20 comprises a cylindrical body part 21 and a sliding cylindrical member 22 vertically sliding on the outer circumference. The cylindrical body part 21 includes a stopper ball appearing/disappearing in the radial direction. An elastic member is interposed between the sliding cylindrical member 22 and the cylindrical body part 21, and always biases upward the sliding cylindrical member 22 and presses the stopper ball in the shaft core direction. An annular groove part 16 provided at the telescopic rod 15 can be matched, and the telescopic rod 15 is fixed to the cylindrical body part 21. When the sliding cylindrical member 22 is shifted downward, the stopper ball is matched with a diameter size part of the sliding cylindrical member 22 and is shifted outward, the matching of both is released, and the fixing is released. An upper end part in the cylindrical body part 21 of the connection part 20 is separated from the upper end part of the sliding cylindrical member 22. An elastic body is provided at the lower end part of the telescopic rod 15, and this elastic body presses and biases an inner wall surface of the support tube 11.

Description

  The present invention relates to a braking mechanism and a locking mechanism related to various support columns that can be vertically expanded and contracted, such as an infusion stand, a camera tripod, and a lighting stand.

Examples of conventional up-and-down telescopic support columns include the inventions described in the following patent documents.
An object of the drip stand described in this patent document is to prevent the support portion that suspends and supports the chemical solution container from being obstructive when not in use.

  The structure includes a cylindrical main body, a telescopic rod-like body that is housed in the main body and is extended and fixed upward from the main body, and a drip medicine provided on the upper part. And a support portion for supporting the suspension. Two support parts are provided rotatably at the upper end of the telescopic rod-like body, and these support parts are rotated and aligned in the same longitudinal direction as the telescopic bar-like body, so that these support parts are the same as the telescopic bar-like body. Can be housed inside the main body. The vertical expansion and contraction of the telescopic rod-like body is fixed or released by a vertical sliding operation of a sliding cylinder provided at the upper end of the main body as a fixing means.

JP 2010-253121 A

  In the drip stand described in the above-mentioned patent document, the telescopic rod-like body can be extended upward from the inside of the cylindrical main body (support tube) and fixed at the desired height position. When the telescopic rod-shaped body is housed inside the tube), the telescopic rod-shaped body is released from being fixed by sliding the sliding cylinder downward.

Due to such a configuration, in the case of the drip stand, if the sliding cylinder is accidentally pushed down, the extension of the telescopic rod-shaped body is released, and the telescopic rod-shaped body is And is stored in the main body.
Also, in such a situation, the finger of the hand holding the sliding cylinder is sandwiched between the upper end of the main body and the support provided at the upper end of the telescopic rod-like body, resulting in injury. Problem occurs.

Therefore, in the present invention, in order to solve the above problems, a first problem is to create a braking mechanism that applies a brake when the telescopic rod-like body is vertically expanded and contracted.
Next, even if the sliding cylinder is accidentally operated as described above, a lock mechanism is also added to prevent the sliding cylinder from moving or sliding downward. This is the second problem.
In addition, in this invention, it can apply not only to the drip stand like the said prior art example but to all the support | pillars which can be expanded-contracted up and down.

  In order to solve the above-mentioned problems, a first aspect of the present invention includes a support tube, a telescopic rod-like body housed in the support tube, and a fixing means for fixing the telescopic rod-like body to an appropriate height position. In the vertically extendable strut provided at the upper end portion of the support tube, the fixing means is provided at a connection portion fixed to the upper end of the support tube, and the telescopic rod-like body is provided inside the support tube through the connection portion. The connecting portion is composed of a cylindrical main body portion that is connected and fixed to the support tube at the lower end thereof, and a sliding cylindrical body that slides up and down on the outer periphery thereof. One or two or more stopper balls appearing in the radial direction are provided at appropriate positions on the main body, and an elastic member such as a coil spring is interposed between the inner periphery of the sliding cylinder and the outer periphery of the cylindrical main body. By always urging the sliding cylinder upward, the stopper The ball can be pressed in the axial direction, and an annular groove can be formed on the lower outer peripheral surface of the telescopic rod-like body to fit the stopper ball, whereby the annular groove of the telescopic rod-like body and the stopper ball on the cylindrical main body side can be By fitting, the telescopic rod-like body is fixed to the cylindrical main body, and the stopper ball has a large inner diameter on the inner peripheral surface of the sliding cylinder by moving the sliding cylinder downward against the urging direction. By adapting to the most part and moving to the outside, the compatibility between the two is released, the fixation between the telescopic rod-like body and the cylindrical main body part is released, and the upper part of the cylindrical main body part of the connecting part is formed appropriately long The upper end of the cylindrical body is separated from the position of the upper end of the sliding cylinder, and an elastic body that biases outward is provided at the lower end of the telescopic rod. The inner wall of the tube is pressed and urged to Braking force to the upper and lower sliding operation of the body is a brake mechanism of the upper and lower telescopic struts, characterized in that acting.

  According to a second aspect of the present invention, in the first aspect, the elastic body provided at the lower end portion of the telescopic rod-shaped body uses a substantially V-shaped elastic linear member, and the lower end portion of the telescopic bar-shaped body Two notches are provided at opposite positions in the longitudinal direction, and the substantially linear V-shaped elastic filament material is fixed to a diametrical support shaft provided at the lower end of the telescopic rod-like body, and the distal end portion of the elastic filament material is supported. A braking mechanism for a vertically extendable strut, which is capable of pressing and urging an inner wall surface of a pipe.

  According to a third aspect of the present invention, there is provided the braking mechanism for the vertically extendable strut according to the first or second aspect, wherein the support tube and the connecting portion are integrally formed.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the sliding cylinder of the connection portion can be rotated in the circumferential direction with respect to the cylindrical main body, and at least the lower end peripheral portion of the sliding cylinder A cutout is provided at one location, and on the other hand, a protrusion is provided on the outer peripheral surface of the cylindrical main body, and the protrusion is provided in the cylindrical main body at a position where the lower peripheral edge of the sliding cylindrical body abuts. The stopper ball provided is not released from the fit with the annular groove of the telescopic rod-like body, and the sliding cylinder is in a position where the projection is fitted with the notch provided at the lower peripheral edge of the sliding cylinder. This is a braking and locking mechanism for the vertically telescopic strut, wherein the stopper ball moves to the large diameter portion of the inner peripheral surface of the inner peripheral surface and the fit with the annular groove portion of the telescopic rod-like body is released.

  According to a fifth aspect of the present invention, in the fourth aspect, the elastic body provided at the lower end portion of the telescopic rod-shaped body uses a substantially V-shaped elastic linear member, and the lower end portion of the telescopic bar-shaped body Two cuts are provided in the longitudinal direction, and the substantially V-shaped elastic filament material is fixed to the diametrical support shaft provided at the lower end of the telescopic rod-like body so that the distal end portion of the elastic filament material expands and contracts from the cut. It is a braking and locking mechanism for a vertically extendable strut that is extended to the outside of the rod-like body and thereby can press and urge the inner wall surface of the support tube.

  According to a sixth aspect of the present invention, there is provided a braking and locking mechanism for a vertically extending and retractable support column according to the fourth or fifth aspect, wherein the support tube and the connecting portion are integrally formed. is there.

  In the first aspect of the present invention, an elastic body that urges outward is provided at the lower end of the telescopic rod-like body that expands and contracts vertically inside the support tube, and this elastic body presses and urges the inner wall surface of the support tube. Therefore, a braking force acts on the vertical sliding movement of the telescopic rod-like body, and it is possible to prevent the telescopic rod-like body from being stored and dropped into the support tube at once. If this is not applied, the telescopic rod-like body will not move or slide downward.

This is the same when the telescopic rod-like body is pulled upward from the inside of the support tube, and the telescopic rod-like body is extended upward by applying a certain predetermined force.
In addition, the length of the upper part of the connecting part is formed long, and the position of the upper end part of the connecting part is separated from the position of the upper end part of the sliding cylinder, so that the telescopic rod-like body moves downward and is supported. When stored inside the tube, there is no risk of the fingers of the hand being pinched between the upper end of the telescopic rod and the upper end of the sliding cylinder.

According to a second aspect of the present invention, the elastic body is further embodied in the first aspect.
That is, the elastic body provided at the lower end portion of the telescopic rod-shaped body uses a substantially V-shaped elastic wire material, and the lower end portion of the telescopic bar-shaped body is provided with two cuts in the longitudinal direction. The substantially V-shaped elastic linear member is fixed to a diametrical support shaft provided at the lower end so that the tip of the elastic linear member can press and urge the inner wall surface of the support tube. The same effect as the invention of 1 is exhibited.

  According to a third aspect of the present invention, the support tube and the connection portion are integrally formed, and the support tube and the connection portion are formed separately and fixed to each other. Alternatively, both may be formed integrally as in the third aspect of the invention.

According to a fourth aspect of the present invention, a lock mechanism is further added to the first aspect of the present invention.
That is, the sliding cylindrical body of the connecting portion can be rotated in the circumferential direction with respect to the cylindrical main body portion, and a cutout portion is provided in at least one portion of the lower peripheral edge of the sliding cylindrical body, while the cylindrical main body portion A protrusion is provided on the outer peripheral surface of the sliding cylinder, and when the lower peripheral edge of the sliding cylinder comes into contact with the protrusion, the stopper ball disposed in the cylindrical main body is connected to the annular groove of the telescopic rod. When the engagement is not released and the protrusion fits with the notch provided at the lower peripheral edge of the sliding cylinder, the stopper is placed on the large diameter portion of the inner peripheral surface of the sliding cylinder. The ball is transferred, and the conformity with the annular groove portion of the telescopic rod-like body is released, so that the telescopic rod-like body is in a state in which it can be vertically stretched.
Therefore, as described above, the vertical movement of the telescopic rod-like body is locked in a state where the lower end portion of the sliding cylinder is in contact with the projection, and in this state, the sliding cylinder is temporarily inadvertently attached. Even if a downward pressing force is applied, the telescopic rod-like body does not move downward.

According to a fifth aspect of the present invention, the elastic body at the lower end portion of the telescopic rod-like body is further embodied in the fourth aspect, and the effect is the same as that of the fourth aspect.
Also in the sixth aspect of the present invention, in the fourth or fifth aspect of the present invention, the support tube and the connecting portion are integrally formed, and the effect is the same as that of the fourth or fifth aspect. It is the same.

The one embodiment which concerns on the up-and-down telescopic column of this invention is shown, The (A) is a partially abbreviated whole front view, The (B) is a side view of the lower end part of an expansion-contraction rod-shaped body. It is an expansion perspective view explanatory drawing of the connection part which concerns on the said embodiment. It is sectional explanatory drawing which shows the state which the connection part which concerns on the said embodiment has fixed the expansion-contraction rod-shaped body. It is sectional explanatory drawing which shows the state by which fixation with the connection part which concerns on the said embodiment, and an expansion-contraction rod-shaped body was cancelled | released. It is a section explanatory view showing the locked state where the downward movement of the sliding cylinder of the connecting part concerning the above-mentioned embodiment was blocked.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an embodiment of the vertically extendable support column of the present invention, in which (A) is a partially omitted front view, and (B) is a side view of a lower end portion of an extendable rod-like body.
The vertically telescopic column 10 according to the present invention includes a support tube 11 positioned below, a connection portion 20 fixed to the upper end portion of the support tube 11, and the support tube 11 via the connection portion 20. It is composed of three parts of a telescopic rod 15 that is housed or inserted and is slidable or movable in the vertical direction. All three parts are made of metal.

The support tube 11 and the connection part 20 are screwed together. That is, a male screw is engraved on the outer periphery of the upper end of the support tube 11, and a female screw is engraved on the inner peripheral surface of the lower end of the connecting portion 20 and screwed together.
Of course, they may be integrally formed by welding them together.

As will be described in detail later, the connecting portion 20 includes a cylindrical main body portion 21 and a sliding cylindrical body 22 that can slide up and down on the outer periphery of the cylindrical main body portion 21.
Although not shown in FIG. 1, the cylindrical main body portion 21 is provided with a plurality of stopper balls protruding and retracting in the radial direction thereof. When the sliding cylindrical body 22 moves upward, the cylindrical main body portion is provided with these stopper balls. 21 protrudes to the center side, engages or fits with a plurality of annular grooves 16 provided at appropriate positions on the outer periphery of the telescopic rod-like body 15, and the telescopic rod-like body 15 is fixed at an appropriate height position.

On the other hand, when the sliding cylinder 22 moves downward, these stopper balls are not shown in the figure, but are adapted to the large diameter portion of the sliding cylinder 22 and move to the outside of the cylindrical main body 21. Then, the engagement with the annular groove 16 of the telescopic rod-like body 15 is released, and the telescopic rod-like body 15 becomes movable in the vertical direction.
A coil spring is housed between the inner wall surface of the sliding cylinder 22 and the cylindrical main body 21, and the sliding cylinder 22 is always urged upward.

  That is, by moving the sliding cylinder 22 downward against the urging force of the coil spring, the telescopic bar 15 can be moved up and down, and the telescopic bar 15 is moved upward, so that the cylindrical body When the stopper ball disposed in the portion 21 is fitted with the annular groove 16 of the telescopic rod-like body 15 and the sliding cylinder 22 is in the upper position, the telescopic rod-like body 15 is appropriately fixed at the height position; It becomes.

Here, the upper portion 21u of the cylindrical main body portion 21 of the connection portion 20 is different in height position of the upper end portion so that the upper end portion is appropriately positioned above the upper end portion of the sliding cylinder 22 by an appropriate length. It is set as follows.
The appropriate length may be at least about the width of one finger.
The reason for this is that, for example, in the case of an infusion stand, at the upper end of the telescopic rod 15, the support member that suspends the chemical solution container extends in the lateral direction, and when the telescopic rod 15 is accidentally dropped downward. This is because a finger may be caught between the support member and the sliding cylinder 22.

However, in the present invention, as will be described below, the elastic body is housed in the lower end portion of the telescopic rod-like body 15, so that there is little risk of pinching a finger.
A knurled portion 22r is provided on the upper outer peripheral portion of the sliding cylinder 22 to prevent slipping, and this portion can be held up and down and operated up and down.

The telescopic rod-like body 15 is housed inside the connection portion 20 and the support tube 11 and can reciprocate up and down, and a plurality of annular groove portions 16 are provided on the outer periphery of the lower portion thereof.
By selecting one of these annular grooves 16 and fitting it with a stopper ball inside the connecting portion 20, the telescopic rod-like body 15 is fixed at an appropriate height.

At the lower end portion of the telescopic rod-like body 15, an elastic linear member 18 having a substantially V shape in front view as an elastic body is provided.
That is, the lower end portion of the telescopic rod-like body 15 is provided with a cut 19 in the longitudinal direction, and the lower end portion is provided with a shaft portion 17 in the diametrical direction. A plurality of substantially V-shaped elastic wires are provided on the shaft portion 17. The strip 18 is fixed.

  The elastic linear member 18 is attached to the shaft portion 17 at a fulcrum portion at the lower end of the substantially V-shape in front view, the upper end portions are expanded left and right, and from the notches 19 of the telescopic rod-like body 15. It extends to the outside and presses the inner wall surface of the support tube 11 in a state where the telescopic rod-like body 15 is housed inside the support tube 11 and biases it outward.

With this configuration, the telescopic rod-like body 15 is appropriately held at its height position without falling down even if the connection tube 20 is not fixed particularly in the support tube 11. You can maintain that state.
When changing the height position of the telescopic rod-like body 15, it can be moved by applying a little force upward or downward.

FIG. 2 is an enlarged perspective explanatory view of the connecting portion 20.
In this embodiment, the connecting portion 20 is formed separately as a single component.
The internal structure will be described in detail later with reference to FIG.
The upper end portion of the support tube 11 is fixed to the lower end portion of the connection portion 20, and the telescopic rod-like body 15 is inserted into the cylindrical main body portion 21 of the connection portion 20 from above, and is inserted into the support tube 11 below. The Rukoto.

  The connecting portion 20 includes a cylindrical main body portion 21 and a sliding cylindrical body 22 that reciprocates up and down around the outer periphery of the substantially central portion thereof, and resists the biasing force of a coil spring inside the sliding cylindrical body 22. As a result of being moved downward, the fixing by the stopper ball built in the side wall of the cylindrical main body portion 21 is released, and the telescopic rod-like body 15 is inserted inside the cylindrical main body portion 21 so as to be movable up and down. It is configured.

  The state shown in FIG. 2 is a state in which the sliding cylinder 22 is biased upward, and the stopper ball provided on the cylindrical main body 21 protrudes from the side wall of the cylindrical main body 21 toward the center side. In this state, the telescopic rod-like body 15 is fixed.

  From this state, the fixing is released by moving the sliding cylinder 22 downward. At this time, the knurled portion 22r of the sliding cylinder 22 is gripped with a finger and pushed downward. At this time, a notch 23 is provided at the lower end of the sliding cylinder 22, and the other side. In addition, a protrusion 24 is provided on the lower outer peripheral surface of the cylindrical main body 21, and the sliding cylindrical body 22 can be pushed down in a state where the positions of both of them coincide with each other.

And this sliding cylinder 22 is freely rotatable in the circumferential direction.
That is, the position of the notch 23 at the lower end and the protrusion 24 of the cylindrical main body 21 can be made different.

  By making these positions different, the lower end portion of the sliding cylindrical body 22 collides with the projection 24 of the cylindrical main body portion 21, so that the sliding cylindrical body 22 cannot be moved downward, and as a result. The stopper ball inside the cylindrical main body portion 21 cannot move outward, and remains locked without being released from the fixation of the telescopic rod 15.

Details regarding this will be described below with reference to FIGS.
FIG. 3 is a cross-sectional explanatory view showing a state in which the connecting portion according to the embodiment fixes the telescopic rod-like body.
In the state shown in this figure, the stopper ball 26 provided on the side wall of the cylindrical main body portion 21 of the connecting portion 20 protrudes from the inner wall surface of the cylindrical main body portion 21 toward the center, and the telescopic rod-like body 15. This is in a state of being mutually compatible with the annular groove portion 16.
In this embodiment, four stopper balls 26 are provided at the same interval in the circumferential direction of the cylindrical main body 21.

  In this state, the sliding cylinder 22 is urged upward by a coil spring 27 interposed between the sliding cylinder 22 and the cylindrical main body 21. The inner wall surface 28 of the body 22 presses the stopper ball 26 toward the center, and the fit between the stopper ball 26 and the annular groove portion 16 of the telescopic rod-shaped body 15 remains fixed without being released, and the telescopic rod-shaped body 15 Is in a state where the predetermined height position is maintained.

A stopper ring 29 is provided on the cylindrical main body 21 side so that the sliding cylinder 22 does not slip upward.
Further, the upper inner wall of the sliding cylinder 22 is formed with a large diameter portion 30 with a large inner diameter.
Accordingly, when the sliding cylinder 22 is moved downward, the stopper ball 26 moves to the large diameter portion 30 and the fixation of the telescopic rod-like body 15 is released.
That is, in this state, the stopper ball 26 is released from the conformity with the annular groove 16 provided on the outer periphery of the telescopic rod-like body 15.

FIG. 4 is an explanatory cross-sectional view showing a state where the connection between the connecting portion and the telescopic rod-like body according to the embodiment is released.
In the state of FIG. 4, the position of the notch 23 at the lower end of the sliding cylinder 22 and the position of the protrusion 24 provided on the outer peripheral surface of the cylindrical main body 21 coincide with each other. The moving cylinder 22 is in a state of moving downward.

In this state, the sliding cylinder 22 has its inner wall surface 28 shifted downward, and the upper diameter portion 30 comes to the position of the stopper ball 26 so that the stopper ball 26 can move outward. .
As a result, the fit between the stopper ball 26 and the annular groove 16 of the telescopic rod-like body 15 is released, and the telescopic rod-like body 15 can freely move up and down. That is, the height position of the telescopic rod-like body 15 can be changed to a state that can be freely changed as appropriate.

On the other hand, in this state, when the hand holding the sliding cylinder 22 is released, the sliding cylinder 22 is urged upward by the urging action of the coil spring 27, but the stopper ball 26 is in the form of a telescopic rod. The outer peripheral surface of the body 15 remains pressed.
In this state, the telescopic rod-like body 15 is moved up or down, and when it is fitted to the adjacent annular groove 16, the stopper ball 26 is fitted to the annular groove 16 and the sliding cylinder 22 is moved upward. The telescopic rod-like body 15 is fixed again.

FIG. 5 is a cross-sectional explanatory view showing a locked state in which the downward movement of the sliding cylinder of the connecting portion according to the embodiment is prevented.
As can be seen from this figure, in this state, the notch provided at the lower end of the sliding cylinder 22 does not exist at the same position as the protrusion 24 provided on the outer peripheral surface of the cylindrical main body 21.

Therefore, when the sliding cylinder 22 is pushed down in the state of this figure, the lower end of the sliding cylinder 22 collides with the protrusion 24 and does not move downward, and the inner wall surface 28 of the sliding cylinder 22 is The state where the stopper ball 26 provided on the side wall of the cylindrical main body 21 is still pressed is maintained as usual.
Therefore, the fixation of the telescopic rod-like body 15 is not released, and the upward or downward movement of the telescopic rod-like body 15 is impossible, and the locked state is brought about.

Although the embodiment has been described above, various design changes can be made in the present invention as follows.
First, the up-and-down telescopic column according to the present invention can be used by providing a leg at the lower end thereof, or by being fixed to various moving bodies, or by being directly fixed to various facilities. it can.
In addition, a desired supported article such as a support part of a drug solution container for infusion, a camera, and a lighting fixture can be appropriately fixed to the upper end part of the support column.
Thus, it can be used as a support column that supports a desired article and can change its height.

The length, thickness, etc. of the support tube and the telescopic rod can be appropriately changed.
The telescopic rod-like body is not a rod-like body, and can be formed from a tubular body.
The vertical length of the cylindrical main body portion in the connecting portion can also be set as required, but the upper end position and the upper end position of the sliding cylinder are different, and at least about the width of one finger. It is necessary to make the lengths different.

The elastic body provided at the lower end portion of the telescopic rod-like body can be freely changed in design, and any elastic body can be used as long as it can exert an urging force in the outer direction or the outer circumferential direction.
The number and length of the elastic filament material having a substantially V-shape in front view used in the above embodiment is also free, and the length and width of the notch provided at the lower end portion of the telescopic rod-like body are adapted to suit this. Can be determined.

A means for fixing the support tube to the lower end of the connection portion is completely free, or the support tube and the connection portion can be formed integrally.
As described above, the present invention is a telescopic support column that can accommodate an expandable rod-like body inside the support tube and the connection portion and can be extended upward, and can fix the stretchable rod-like body at an appropriate height position. In this case, it was possible to provide a vertically extendable support column that can be moved up and down while applying a brake to the extendable rod-like body and that can be easily locked so that it cannot be moved up and down.

DESCRIPTION OF SYMBOLS 10 Vertically extendable support | pillar 11 Support tube 15 Telescopic rod-like body 16 Annular groove part 17 Support shaft 18 Elastic linear material 19 Notch 20 Connection part 21 Cylindrical main body part 22 Sliding cylinder body 23 Notch part 24 Projection part 26 Stopper ball 27 Coil Spring 28 Inner wall (sliding cylinder)
29 Stopper ring 30 Large diameter part (of sliding cylinder)

Claims (6)

In the up-and-down telescopic support column provided with a support tube, a telescopic rod-like body housed inside the support tube, and a fixing means for fixing the telescopic rod-like body at an appropriate height position at the upper end of the support tube,
The fixing means is provided in a connection part (20) fixed to the upper end of the support pipe (11), and the telescopic rod-like body (15) is provided in the support pipe (11) through the connection part (20). Stored and extend upward,
The connecting portion (20) is composed of a cylindrical main body portion (21) that is connected and fixed to the support pipe (11) at the lower end thereof, and a sliding cylindrical body (22) that slides up and down on the outer periphery thereof.
One or more stopper balls (26) appearing in the radial direction are provided at appropriate positions of the cylindrical main body (21), and the inner periphery of the sliding cylindrical body (22) and the cylindrical main body (21) are provided. By interposing an elastic member such as a coil spring (27) between the outer periphery, the sliding cylinder (22) can always be urged upward to press the stopper ball (26) in the axial direction,
An annular groove (16) is formed on the lower outer peripheral surface of the telescopic rod-like body (15) to be adapted to the stopper ball (26), whereby the annular groove (16) of the telescopic rod-like body (15) and the tubular body By fitting the stopper ball (26) on the part (21) side, the telescopic rod-like body (15) is fixed to the cylindrical body part (21),
By moving the sliding cylinder (22) downward against the urging direction, the stopper ball (26) fits the large diameter part (30) having a large inner diameter on the inner peripheral surface of the sliding cylinder (22). Then, by shifting to the outside, the compatibility between the two is released, the fixation between the telescopic rod-like body (15) and the cylindrical main body (21) is released,
The upper part of the cylindrical main body part (21) of the connecting part (20) is appropriately formed long, and the position of the upper end part of the cylindrical main body part (21) is separated from the position of the upper end part of the sliding cylindrical body (22). And
An elastic body that urges outward is provided at the lower end of the telescopic rod-like body (15), and the elastic body presses and urges the inner wall surface of the support tube (11), whereby the telescopic rod-like body (15) A braking mechanism for a vertically extendable strut, characterized in that a braking force acts on the vertical sliding motion.   The elastic body provided at the lower end portion of the telescopic rod-like body (15) uses a substantially V-shaped elastic linear member (18), and the lower end portion of the telescopic rod-like body (15) is located at the opposite position in the longitudinal direction. Two slits (19) are provided, and the substantially linear V-shaped elastic rod material (18) is fixed to the diametrical support shaft (17) provided at the lower end of the telescopic rod-shaped body (15). The braking mechanism for the vertically extendable strut according to claim 1, wherein the tip portion of the material (18) can press and urge the inner wall surface of the support tube (11).   The braking mechanism for the vertically extendable strut according to claim 1 or 2, wherein the support pipe (11) and the connecting portion (20) are integrally formed.   The sliding cylinder (22) of the connecting portion (20) is rotatable in the circumferential direction with respect to the cylindrical main body (21), and is cut out at least at one position on the lower peripheral edge of the sliding cylinder (22). On the other hand, a projection (24) is provided on the outer peripheral surface of the cylindrical main body (21), and the lower peripheral edge of the sliding cylinder (22) is in contact with the projection (24). In the contact position, the stopper ball (26) disposed in the cylindrical main body (21) is not released from the fit with the annular groove (16) of the telescopic rod (15), and the protrusion (24) At a position that matches the notch portion (23) provided at the lower peripheral edge of the sliding cylinder (22), the stopper is provided on the large diameter portion (30) of the inner peripheral surface of the sliding cylinder (22). The braking and locking mechanism for the vertically extendable strut according to claim 1, wherein the ball (26) moves and the fit with the annular groove (16) of the telescopic rod-like body (15) is released.   The elastic body provided at the lower end of the telescopic rod-shaped body (15) uses a substantially V-shaped elastic wire rod (18), and the lower end of the telescopic rod-shaped body (18) has two cuts in the longitudinal direction. (19) is provided, and the substantially linear V-shaped elastic filament material (18) is fixed to the diametrical support shaft (17) provided at the lower end portion of the telescopic rod-shaped body (15). 5. The upper and lower ends according to claim 4, wherein a tip end portion of the support tube (11) extends from the cut (19) to the outside of the telescopic rod-like body (15), thereby pressing and urging the inner wall surface of the support tube (11). Brake and lock mechanism for telescopic struts.   6. A vertically extending and retractable strut braking and locking mechanism according to claim 4 or 5, wherein the support pipe (11) and the connecting portion (20) are integrally formed.