JP2010223382A - Expansion and contraction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion and contraction device which can easily be set to desired length and is provided with a strong locking structure in a stopper. <P>SOLUTION: The expansion and contraction device includes: a leg part 2 which is formed in a hollow cylindrical shape and whose one end is open; an expansion and contraction leg part 3 whose tip end is inserted internally or externally into an open one end of the leg part 2 and which is formed in a hollow cylindrical shape in which the inner or outer part of the leg part 2 is allowed to slide; an inner cylindrical part 6 which is hollow and whose one end is provided inside the other end side of the leg part 2; an expansion and contraction member 5, which is arranged serially to the other end of the inner cylindrical part 6 and housed in the expansion and contraction leg part 3; a length adjusting member 4 which is arranged on the outside circumferential part of the inner cylindrical part 6 and the expansion and contraction member 5; the stopper 8, at least one piece of which is provided in the inner cylindrical part 6 and which pierces the length adjusting member 4 by going in and out of the inner circumferential part of the inner cylindrical part 6; and a support part 11 which is provided on the inner cylindrical part 6 to support the stopper 8 so as to be capable of going in and out of the inside circumferential part of the inner cylindrical part 6, whose end is extended to the other end of the leg part 2, and which makes the going-in/out operation of the stopper 8 possible at the position of the other end of the leg part 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a telescopic device capable of easily performing stepless length adjustment and length maintenance.

  In general, in a tripod or a stepladder of furniture or a camera, a telescopic device may be installed on the leg for the purpose of freely changing the length of these legs. Such an expansion / contraction device is equipped with a reciprocating expansion / contraction leg that is inserted into or externally inserted into a main leg, and the entire leg is fixed by moving the expansion / contraction leg to an appropriate position and fixing it with a pin or the like. It can be adjusted to a desired length. Furthermore, it is also conceived that an expansion / contraction member such as a spring is installed on the main leg and brought into contact with the expansion / contraction leg, and the expansion / contraction leg is easily moved using the elasticity of the expansion / contraction member.

For example, Patent Document 1 discloses an invention relating to a telescopic device capable of easily changing the length of a leg portion of a camera tripod, stepladder or the like and holding the leg portion firmly under the name of “stretching device”. Yes.
The invention disclosed in Patent Document 1 includes a first leg portion having a window portion in a part of a hollow cylinder and having an end portion opened, and a distal end portion inserted into the opening portion of the first leg portion. A slidable second leg, a length adjusting member connected to the tip of the second leg, a telescopic member connected to the length adjusting member via a slide member, and a first It is comprised from the latching | locking part which latches a length adjustment member in the window part installed in a leg part.
In this telescopic device, the length can be set by inserting and removing the second leg inside the first leg, but when the second leg is pushed into the first leg, Within the one leg portion, the length adjusting member moves toward the direction in which the elastic member is disposed, and the elastic member is compressed. When the locking member is slid and inserted from the window portion in the locking portion when the second leg portion is pushed in and the telescopic device has a desired length, the locking member is formed by a helical spring formed in a spiral shape. The position of the second leg is fixed by piercing the spiral gap of the configured length adjusting member and stopping its movement.
On the other hand, when the telescopic device is extended, the length adjusting member and the second leg are removed by the biasing force of the telescopic member that has been compressed when the locking member is removed and the impact of the length adjusting member is released. The telescopic device can be automatically extended when is pressed.
Further, since the length adjusting member uses a helical spring formed in a spiral shape, it is possible to configure a large number of gaps through which the locking member can stab, that is, the length adjusting member is formed by the locking portion. Can be locked with high accuracy at short locking intervals. As a result, the total length of the telescopic device can be adjusted to a desired length.

Patent Document 2 discloses an invention relating to an expansion / contraction apparatus that includes a pair of expansion / contraction legs and that allows easy length adjustment under the name “extension / contraction apparatus”.
The invention disclosed in Patent Document 2 includes a leg portion having a window portion in a part of a hollow cylinder, a first telescopic leg portion that is slidable by inserting one end portion of the leg portion, and a leg portion. A second telescopic leg that is slidable with the other end inserted therein, a first telescopic member interposed between one end of the leg and the first telescopic leg, and the other end of the leg One end of the second elastic member interposed between the first and second telescopic legs, and the first slide member provided in one end of the leg and slidable inside the leg. A first length adjusting member that is fixed and a second slide member that is provided at the other end of the leg and is slidable inside the leg. A length adjusting member; and a locking portion that locks the first length adjusting member and the second length adjusting member in the window portion provided on the leg portion. Slide the first length A locking member that stabs the adjusting member and the second length adjusting member to inhibit the movement of the first length adjusting member and the second length adjusting member, and the locking member is provided on the leg portion. And a fixing member that is fixed to the window portion.
In this telescopic device, when the first telescopic leg is slid at one end of the leg, the one end of the leg is inserted into the first telescopic leg and contracts. At this time, in the one end portion of the leg portion and the inside of the first telescopic leg portion, the one telescopic member interposed between the one end portion and the first telescopic leg portion is pressed and contracted. At the same time, the first slide member and the first length adjusting member fixed to the first slide member move inside the leg portion.
Then, in the locking portion, when the locking member is inserted from the window portion of the leg portion and the first length adjustment member is stabbed, the first length adjustment member, the first slide member, and the first extension / contraction The member and the first telescopic leg can be fixed to determine the length of one end of the leg. On the other hand, the other end portion of the leg portion has substantially the same mechanism. That is, when the second telescopic leg portion is slid at the other end portion of the leg portion, the leg portion is placed inside the second telescopic leg portion. The other end of the leg portion is inserted and contracted, and the other end portion of the leg portion and the second extensible leg portion are interposed between the other end portion of the leg portion and the second extensible leg portion. The second telescopic member is pressed and contracted, and the second slide member and the second length adjusting member fixed to the second slide member move inside the leg portion. In the locking portion, when the locking member is inserted from the window portion of the leg portion and the second length adjusting member is stabbed, the second length adjusting member, the second slide member, and the second extension / contraction The member and the second telescopic leg can be fixed to determine the length of the other end of the leg. Note that, in the locking portion, the locking member can simultaneously strike both the first length adjusting member and the second length adjusting member. Further, when a helical spring formed in the first length adjusting member and the second length adjusting member is used, the gap between the spirals is narrow and substantially stepless. The distance between the impacts is narrow, and the lengths of the first telescopic leg part and the second telescopic leg part at both ends of the leg part can be freely adjusted.
Further, when the locking member is removed from the first length adjusting member and the second length adjusting member in the locking portion, the urging force of the first and second elastic members that have been compressed is compressed. Thus, the extension of the first extensible leg and the second extensible leg can be automatically performed.
Therefore, the expansion / contraction apparatus which can adjust the length of the both ends of a leg part easily and freely can be provided.

Patent Document 3 discloses an invention relating to an expansion / contraction apparatus that can be easily adjusted to a desired length and can be reduced in size under the name “extension apparatus”.
The invention disclosed in Patent Document 3 includes a leg portion having a window portion in a part of a hollow cylinder and having one end portion opened, and a tip portion inserted into the one end portion opened by the leg portion. An extendable leg that can slide inside the leg, a length adjusting member formed in a spiral shape that is accommodated in series with the extendable leg from the tip of the extendable leg inside the leg, and the inside of the leg And a telescopic member provided from the tip of the telescopic leg portion and disposed inside or outside the length adjusting member, and a locking portion for latching at least the length adjusting member in the window portion provided in the leg portion It is.
In this telescopic device, when the telescopic leg is slid into the leg, the length adjusting member arranged in series with the telescopic leg also slides in conjunction with the telescopic leg, and from the distal end of the telescopic leg. The expansion / contraction member provided in the closed portion side of the leg portion is compressed. When the locking member is inserted from the window provided in the leg when the telescopic leg is slid until the desired length is reached, the locking member opens the gap between the length adjusting members located in the window. The total length of the telescopic device can be determined by impinging and inhibiting the movement of the length adjusting member, the telescopic leg portion and the telescopic member. Conversely, when the locking member is removed from the gap of the length adjusting member to release the locking, the telescopic leg portion can be automatically extended by the biasing force of the telescopic member that has been compressed. If a tension spring formed in a spiral shape is used for the length adjusting member, there are a large number of gaps that can be stabbed by the locking member, so that the length can be adjusted freely. And since the expansion-contraction member is arrange | positioned inside or the outer side of the length adjustment member, size reduction of the whole apparatus is enabled. Furthermore, the first telescopic leg portion and the second telescopic leg portion having the first length adjusting member and the second length adjusting member can be respectively installed at both ends of the leg portion, and the device can be extended. It is also possible to increase the width.

Japanese Patent No. 3630677 JP 2006-207798 A JP 2008-25834 A

However, in the conventional techniques described in Patent Literature 1 to Patent Literature 3, since the locking portions are installed on the outer peripheral portion of the leg portion, the shape includes a protrusion protruding outward on the outer peripheral portion. As a result, there is a problem that it may interfere with use such as touching or hitting the user's body. In addition, when used as a walking stick for the elderly and the disabled, there is a problem that the protrusion is likely to lack the balance of the walking stick or impair the design and beauty.
Further, since the locking member of the locking portion is inserted and stabbed from the outer peripheral side toward the inside, a window portion is required for the leg portion that accommodates the length adjusting member and the expansion / contraction member, and the leg portion is penetrated. Therefore, the length of the leg and the entire telescopic leg cannot be shortened considering interference between the telescopic leg and the locking member that expands and contracts inside the leg. It was.
Further, in any case, the locking member of the locking part is configured to stab and lock one gap in the circumferential direction of the length adjusting member, and the length adjusting member after the stab is distorted in the circumferential direction. There is also a problem that fatigue may occur at the same time that a large load is applied to one portion of the length adjusting member.
Furthermore, in order to hold | maintain in one place, it was necessary to insert a latching member deeply in a length adjustment member, and the length adjustment member had the subject that a deep stroke was requested | required.

  The present invention has been made in response to such a conventional situation, and can easily set and maintain a desired length steplessly, and the length of the leg portion can be considered without considering the influence of the extensible leg portion. It is an object of the present invention to provide a telescopic device that can be provided in a desired length, and further includes a telescopic device that has a firm locking structure in the locking portion.

In order to achieve the above object, the telescopic device according to the first aspect of the present invention includes a leg portion that is formed in a hollow cylindrical shape and has one end portion that is open, and a tip portion that is open at one end portion of the leg portion. Telescopic legs that are inserted or extrapolated and slidable inside or outside the legs and formed in a hollow cylinder, and formed in a hollow cylinder and provided inside the other end of the legs An inner cylinder portion that is arranged in series with an end portion of the inner cylinder portion, and is formed in a spiral shape that is accommodated in the telescopic leg portion, and both ends are fixed in the telescopic leg portion, and the inner cylinder And at least one length adjusting member formed in a spiral shape disposed on the outer peripheral portion of the elastic member, and the length of the inner cylindrical portion, and the length of the length adjusting member A locking portion that stabs the adjustment member, and is provided on the inner cylinder portion so that the locking portion can be inserted and removed from an inner peripheral portion of the inner cylinder portion. And an end portion extending to the other end portion of the leg portion, and a support portion that allows the engaging portion to enter and exit at the position of the other end portion of the leg portion. .
In the telescopic device having the above-described configuration, when the telescopic leg is pushed toward the leg, the telescopic leg is accommodated inside the leg while sliding inside or outside the leg from its distal end. The expansion / contraction member accommodated in the outside and accommodated in the expansion / contraction leg part acts so as to be pressed and urged between the end part of the inner cylinder part and the expansion / contraction leg part. In addition, the length adjusting member is disposed on the outer peripheral portion of the inner cylinder portion and the expansion / contraction member, and the gap between the spiral portions that are present in proportion to the length of the spiral is substantially continuously stepped with a short locking interval. Has the effect of being able to be locked. And in the latching | locking part provided in an inner cylinder part, it has the effect | action of sticking a length adjustment member, suppressing a movement of a length adjustment member, and fixing the position of an expansion-contraction leg part. Further, the support portion acts so as to operate the locking portion at the other end portion of the leg portion. Furthermore, when the locked state is released, the telescopic leg portion has an action of automatically pulling out from the leg portion by the urging force of the telescopic member.

The telescopic device according to a second aspect of the present invention includes a first leg portion that is formed in a hollow cylindrical shape and has one end opened, and a hollow cylindrical shape that is provided in the first leg portion. A tip end portion is inserted into a space formed by opening a second leg portion having one end portion opened and between the first leg portion and the second leg portion, and sliding in the space. A telescopic leg portion that is formed in a hollow cylindrical shape, an inner cylindrical portion that is formed in a hollow cylindrical shape and is provided on the other end side of the second leg portion, and a second leg portion. Outside and inside the first leg and the telescopic leg, one end is disposed inside the first leg, and the other end is disposed inside the telescopic leg, The length adjustment formed in the shape of the spiral member which is arranged in the space formed between the inner cylinder part and the second leg part, both ends are fixed in the telescopic leg part formed in the shape And at least one member provided on the inner tube portion, and a locking portion that enters and exits from the inner peripheral portion of the inner tube portion and strikes the length adjusting member, and is provided on the inner tube portion, And an end portion extending to the other end portion of the second leg portion to allow the engaging portion to be moved in and out of the leg portion. And a support portion that enables at the position of the end portion.
In the telescopic device having the above configuration, when the telescopic leg is pushed toward the first leg and the second leg, the telescopic leg is located between the first leg and the second leg from the tip. It acts to be accommodated in the interior between the first leg and the second leg while sliding in the space formed by opening. The elastic member housed outside the second leg and inside the first leg and the elastic leg is compressed between the first and second legs and the elastic leg, and its restoring force. Acts like energizing with. The length adjusting member is disposed in a space formed between the inner cylindrical portion and the second leg portion, and a large number of spiral portions in proportion to the length of the spiral are substantially stepless with a short locking interval. It has the effect | action of making it latchable by a latching | locking part. And in the latching | locking part provided in an inner cylinder part, it has the effect | action of sticking a length adjustment member, suppressing a movement of a length adjustment member, and fixing the position of an expansion-contraction leg part. Further, the support portion acts so as to operate the locking portion at the other end portion of the leg portion. Furthermore, when the locked state is released, the telescopic leg portion has an action of automatically pulling out from the first and second leg portions by the urging force of the telescopic member.

The telescopic device according to claim 3 is the telescopic device according to claim 1 or 2, wherein the telescopic device is detachably provided in the inner tube portion, and the locking operation is performed by the insertion / removal operation. A lock member capable of preventing and releasing the part is provided.
In the telescopic device having the above-described configuration, in addition to the operation of the invention according to claim 1 or 2, the lock member has an operation of preventing and releasing the locking portion by an insertion / removal operation.

A telescopic device according to a fourth aspect of the present invention is the telescopic device according to the first or second aspect, wherein the locking portion is a space between a plurality of spirals of the length adjusting member formed in the spiral shape. Is provided with a stab member that stabs at the same time in at least two places.
In the telescopic device having the above configuration, in addition to the action of the invention according to claim 1 or 2, the impingement member of the locking portion includes a plurality of spiral gaps of the length adjusting member formed in a spiral shape. It has the effect of strongly sticking at the same time in at least two places. It acts to reduce the load applied from one place and acts to reduce fatigue of both the impingement member and the length adjusting member.

The telescopic device according to claim 5 is the telescopic device according to any one of claims 1 to 4, wherein the length adjusting member is a tension spring or a push spring, and the telescopic member is a push spring. It is what is.
In the telescopic device having the above-described configuration, in addition to the operation of the invention according to any one of claims 1 to 4, the tension spring of the length adjusting member is a spiral spring, and the spiral gap is small at normal times. The push spring of the expansion / contraction member is a spiral spring that normally has a gap, and acts to exert a reaction force when the gap between the spiral gaps is narrowed and contracted. Note that the push spring of the length adjusting member is configured so that the spiral interval is narrower than the push spring of the extendable member. In this claim, the length adjusting member includes not only the pull spring but also the push spring. If the latching portion can be stabbed into this spiral gap, the characteristics of the spring such as the push spring and the pull spring are as follows. It means that you can concept both, not a problem.

A telescopic device according to a sixth aspect of the present invention is configured in a hollow cylindrical shape, and includes a leg portion including a window portion and a groove portion formed along the longitudinal direction in a part thereof, and an inside of the leg portion. An action part which is arranged and partially protrudes from the groove part and slides on the groove part and is slidable inside the leg part, and one end part is fixed in series to the action part and formed in a spiral shape. A length adjusting member, and a fixing portion that is inserted into the spiral length adjusting member and has both ends thereof fixed to the other end of the length adjusting member and the action portion, A locking portion that punctures at least one spiral gap of the helically formed length adjusting member in the window portion provided in the leg portion, and this locking portion is provided on the window portion. And a support portion that is supported so as to be able to enter and exit from the outside.
In the telescopic device having the above configuration, when the action portion slides and slides in the groove portion of the leg portion, the length adjusting member fixed to the action portion, and both ends are fixed to the action portion and the length adjusting member. The fixed part has an action of moving in conjunction with the action part. In addition, the locking portion has an action of blocking the movement of the length adjusting member by piercing at least one of the plurality of spiral gaps of the length adjusting member disposed in the window portion of the leg portion.

A telescopic device according to a seventh aspect of the present invention is the telescopic device according to the sixth aspect, wherein a length adjusting member is fixed to the action portion inside the leg portion configured in a hollow cylinder shape. A telescopic member is arranged in series on the non-side or in parallel inside the length adjusting member.
In the expansion / contraction apparatus having the above-described configuration, in addition to the operation of the invention described in claim 6, when the expansion / contraction member is arranged in parallel inside the length adjustment member, the expansion / contraction member acts to extend by the movement of the length adjustment member. On the other hand, when the length adjusting member is arranged in series with respect to the action portion on the side where the length adjusting member is not fixed, it acts so as to be compressed by the movement of the length adjusting member.

The expansion / contraction device according to an eighth aspect of the present invention is the expansion / contraction device according to the seventh aspect, wherein the length adjusting member is a tension spring or a push spring, and the stretch member is a push spring or a tension spring.
In the expansion and contraction device having the above-described configuration, in addition to the effect of the invention described in claim 7, the tension spring serving as the length adjusting member is a spiral spring, and there are innumerable spiral gaps at a normal time. In addition, the push spring serving as the expansion / contraction member is a spiral spring having a gap in a normal state, and exhibits a reaction force when the gap between the spiral gaps is narrowed and contracted. The tension spring as an expansion / contraction member is a spiral spring that normally has a small gap between the spirals, and when it is extended, it exerts a reaction force when extended by extending the gap interval.
Note that the push spring of the length adjusting member is configured so that the spiral interval is narrower than the push spring of the extendable member. In the present invention, the length adjusting member includes not only the pull spring but also the push spring, as in the case of the fifth aspect, as long as the engaging portion can be stabbed into the spiral gap. The characteristic of the spring is not a problem, it means that both can be conceptualized.

  In the expansion / contraction device according to claim 1 of the present invention, the length of the expansion / contraction device is adjusted to a desired length by operating the locking portion in and out of the support portion extending to the other end of the leg portion. Can do. Further, the length of the telescopic leg portion can be set for each gap of the spiral portion set in a stepless manner of the length adjusting member, thereby enabling fine adjustment. And since the latching | locking part is installed in the inner peripheral part of the inner cylinder part, the peripheral part of a leg part can be formed in a substantially cylindrical shape, without forming a protrusion. Therefore, it can be used safely without touching or hitting the user of the telescopic device, the center of gravity position in the circumferential direction of the leg portion of the telescopic device is close to the center of the leg portion, and the balance is good. Furthermore, since the locking portion is inserted into the length adjustment member from the inside of the leg portion, there is no interference with the expansion / contraction leg portion located outside the length adjustment member, and the position and length of the expansion / contraction leg portion, etc. Therefore, it is possible to shorten the length of the entire leg portion and the telescopic leg portion without being caught by the movement.

  In the telescopic device according to claim 2 of the present invention, the telescopic member is disposed so as to contact the first and second leg portions and the telescopic leg portion, and the inner cylinder portion is located inside the telescopic member. Therefore, it is possible to increase the extension width of the expansion device. Further, since the first leg portion and the second leg portion are provided and the elastic member is disposed between them, the elastic member is not seen from the outside, and the appearance is excellent. Moreover, since there is no protrusion on the outer peripheral portion of the expansion / contraction device as in the case of the expansion / contraction device according to claim 1, such a protrusion can be used safely without touching or hitting the user, and the leg of the expansion / contraction device The position of the center of gravity in the circumferential direction of the part is close to the center of the leg part and the balance is good. In addition, since the locking portion is stuck to the length adjusting member inside the second leg portion, there is no interference with the second leg portion located outside the length adjusting member, and the position of the telescopic leg portion It is possible to shorten the lengths of the first and second leg portions and the entire extension / contraction leg portion without being caught by the length and the like.

  In the telescopic device according to the third aspect of the present invention, the locking member can prevent and release the locking portion, and can secure and securely lock the locking member. Can be easily released.

  In the telescopic device according to the fourth aspect of the present invention, since the plurality of spiral gaps of the length adjusting member can be simultaneously abutted in at least two places by the abutting member installed in the locking portion, a stronger engagement can be achieved. It is possible to hold the stopped state. By improving the balance of the impingement, it is possible to hold the position stably without causing distortion of the length adjusting member, and to reduce fatigue by dispersing the load. An effect can also be exhibited.

  In the telescopic device according to claim 5 of the present invention, since the tension adjusting spring is used as the length adjusting member, the gap of the spiral portion is innumerable in a normal state. Therefore, the locking portion has the spiral gap substantially steplessly. By locking, the length of the telescopic device can be easily finely adjusted. In addition, since a push spring is used for the expansion / contraction member, a spiral spring having a gap in a normal state can exert a reaction force when the interval of the spiral gap is narrowed and contracted. When the reaction force is used, the expansion / contraction device can be easily expanded and contracted.

  In the telescopic device according to the sixth aspect of the present invention, the length of the leg portion is locked by locking the length adjusting member fixed to the action portion that slides the groove portion formed along the shape of the leg portion. Therefore, even if the leg portion has a shape other than the linear shape, it can be dealt with.

  And in the expansion-contraction apparatus of Claim 7 of this invention, the movement of an action part can be easily performed using the urging | biasing force by expansion-contraction of an expansion-contraction member.

  Finally, in the telescopic device according to the eighth aspect of the present invention, since the tension spring or the push spring having a small number of gaps in the spiral portion in the normal state is used as the length adjusting member, the locking portion is substantially free. The spiral gap is locked to the stage to freely determine the length of the telescopic device and to allow fine adjustment thereof. In addition, since a push spring or a pull spring is used for the expansion and contraction member, in the case of a push spring, a clearance is provided at normal times, and a reaction force is exhibited when the space between the spiral gaps is narrowed and contracted. In this case, a reaction force is exerted when the space between the spiral gaps is expanded at the time of expansion, and the expansion device can be easily extended by using the reaction force as a force for extending the expansion device.

It is a conceptual diagram which shows a part of internal structure of the expansion-contraction apparatus which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the expansion-contraction apparatus which concerns on 1st Embodiment. (A) is an external view of the connection member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is arrow sectional drawing of the part shown by the AA line in Fig.3 (a). (C) is the arrow sectional drawing of the part similarly shown by the A1-A1 line in Fig.3 (a). (A) is an external view of the locking member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is arrow sectional drawing of the part shown by the BB line in Fig.4 (a). FIG. 4C is a sectional view taken along the line B1-B1 in FIG. 4A. (A) is an external view of the stopper support member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is arrow sectional drawing of the part shown by CC line in Fig.5 (a). FIG. 6C is a sectional view taken along the line C1-C1 in FIG. 5A. (A) is a longitudinal cross-sectional view of the 1st stopper connection member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is a top view of a 1st stopper connection member similarly. (A) is a longitudinal cross-sectional view of the 2nd stopper connection member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is a top view of a 2nd stopper connection member similarly. It is an external view of the stopper of the expansion-contraction apparatus which concerns on 1st Embodiment. (A) is a longitudinal cross-sectional view of the 1st inner cylinder part of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is the arrow of the part shown by the DD line in Fig.9 (a) FIG. (A) is an external view of the rotation stop member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is the arrow directional cross section of the part shown by the EE line in Fig.10 (a). FIG. (A) thru | or (d) is a conceptual diagram at the time of assembling each component around the stopper of the expansion-contraction apparatus which concerns on 1st Embodiment. It is an external view of the expansion-contraction apparatus which concerns on 1st Embodiment. It is a conceptual diagram which shows the internal structure of the expansion-contraction apparatus which concerns on the 2nd Embodiment of this invention. (A) is an external view of the expansion-contraction apparatus which concerns on 2nd Embodiment, (b) is a top view of the expansion-contraction apparatus similarly. It is a conceptual diagram which shows the internal structure of the expansion-contraction apparatus which concerns on the 3rd Embodiment of this invention. It is a conceptual diagram which shows the internal structure of the expansion-contraction apparatus which concerns on 3rd Embodiment. (A) is a conceptual diagram when the state where the stopper of the expansion / contraction apparatus according to the third embodiment is not locked is viewed from above, and (b) is the stopper of the expansion / contraction apparatus according to the third embodiment. (C) is a conceptual diagram when the guide plate is attached to the stopper of the telescopic device according to the third embodiment. FIG. 9 is a conceptual diagram when a guide plate and a rotating plate are attached to the stopper of the expansion device according to the third embodiment, and FIG. 5E is a guide plate at the stopper of the expansion device according to the third embodiment. (F) is a conceptual diagram in case the stopper of the expansion-contraction apparatus which concerns on 3rd Embodiment is installed in the inner cylinder part. It is a front view of the expansion-contraction apparatus which concerns on 4th Embodiment. It is a rear view of the expansion-contraction apparatus which concerns on 4th Embodiment. It is a conceptual diagram which expands and shows the action part periphery of the expansion-contraction apparatus which concerns on 4th Embodiment. It is a conceptual diagram of the support part periphery of the expansion-contraction apparatus which concerns on 4th Embodiment. (A) is a perspective view of the support part periphery of the expansion-contraction apparatus which concerns on 4th Embodiment, (b) is a conceptual diagram for demonstrating the latching mechanism of a stopper similarly.

Hereinafter, a first embodiment of a telescopic device according to the present invention will be described with reference to FIGS. (In particular, it corresponds to claim 1, claim 3 and claim 5)
FIG. 1 is a conceptual diagram showing a part of the internal structure of the telescopic device according to the first embodiment of the present invention.
In FIG. 1, the telescopic device 1 according to the first embodiment is used for a walking stick (cane), and is an opening 2a having one end (that is, the lower end) opened in a hollow cylindrical body. And a telescopic leg 3 having a hollow cylindrical body with one end opened. And the outer periphery of the expansion-contraction leg part 3 is formed smaller than the inner periphery of the leg part 2, and the expansion-contraction leg part 3 can be inserted in the inside of the leg part 2, and is comprised so that it can slide freely.
In addition, an inner cylinder portion 6 is provided inside the other end portion side (that is, the upper end portion side) of the leg portion 2 and is a hollow cylindrical body in which a stopper insertion window 7 is partially formed. A fixing tool 9 is fitted on the end portion of the inner cylinder portion 6, and the pressing spring 5, which is an elastic member whose one end portion is fixed to the fixing tool 9, is in series with the end portion of the inner cylinder portion 6. And is accommodated inside the telescopic leg 3. Note that the end portion of the inner cylinder portion 6 is a concept including the vicinity of the end portion itself in addition to the end portion itself.
Furthermore, inside the leg part 2 and the telescopic leg part 3, a tension spring 4 that is helically engaged as a length adjusting member is disposed on the outer peripheral part of the inner cylinder part 6 and the push spring 5. In the drawing, the tension spring 4 is divided into three parts, but is actually formed as one continuous part, and one end (upper end) is the stopper insertion window 7. It is arranged in the telescopic leg 3 so as to exceed. The installation of the tension spring 4 will be described in detail. Although not shown, the tension spring 4 extends from the distal end portion (lower end portion) of the telescopic leg portion 3 and is inserted into the leg portion 2. The both ends are fixed by a tension spring fixing member provided in, and movement is suppressed.
The stopper 8 protruding from the stopper insertion window 7 of the inner cylinder portion 6 is not shown in the figure, but stabs and locks the gap between the tension springs 4 located in the stopper insertion window 7. Although the details will be described later, the support rod 10 inserted into the inner cylinder portion 6 is a part of a support portion that supports the stopper 8 so as to be able to enter and exit the stopper insertion window 7, and is inserted through the inside of the grip portion 12. And connected to the knob 11. In addition, although the code | symbol 13 has described only one part, it is a reinforcement member of the holding part 12, is connected with the leg part 2, and supports the holding part 12, and the code | symbol 14 is the expansion-contraction leg part 3. It is the lower end tool with which the lower end of this is attached.

In the specification of the present application, the “push spring” is a spiral spring having a gap at normal times, and a spring that exerts a reaction force when the gap between the spiral gaps is narrowed and contracted. The “spring spring” is a spiral spring with a small or almost no gap during normal operation, but the “spring spring” as a length adjusting member is not necessarily required to exert a restoring force when the spring is pulled. Instead, it is simply based on a spiral shape. Therefore, assuming that a “push spring” is used instead of a “pull spring”, there may be a case where a restoring force is not exerted when the spring is pushed, and furthermore, there is little or almost no gap between the spiral gaps. If so, there is no problem even if a “push spring” is used instead of the “pull spring”.
In the telescopic device 1, the outer circumference of the telescopic leg 3 is formed smaller than the inner circumference of the leg 2, and the telescopic leg 3 is configured to slide inside the leg 2. Alternatively, the outer periphery of the leg 2 may be formed smaller than the inner periphery of 3 so that the telescopic leg 3 slides outside the leg 2.

Here, the expansion / contraction mechanism of the expansion / contraction apparatus 1 will be described.
When the telescopic device 1 shown in FIG. 1 is contracted, the telescopic leg 3 is inserted into the leg 2 by pushing the telescopic leg 3 toward the inside of the leg 2, and at the same time, the push spring 5 contracts. Is done. When the telescopic device 1 reaches a desired length, the knob 11 is operated to rotate the support bar 10 by a predetermined angle, and the stopper 8 is protruded from the stopper insertion window 7 of the inner cylinder portion 6. When the gap between the tension springs 4 located in the stopper insertion window 7 is stabbed and locked, the movement of the push spring 5 and the telescopic leg 3 is suppressed, and as a result, the total length of the telescopic device 1 can be determined. it can. Conversely, when the telescopic device 1 is extended, if the support rod 10 is rotated by a predetermined angle by operating the knob 11 and the engagement of the stopper 8 with the pulling spring 4 is released, the compression is reduced. The telescopic leg 3 is automatically pulled out of the leg 2 by the restoring force of the push spring 5 that has been applied, so that the telescopic device 1 can be easily extended.
In the present embodiment, a cylindrical body is adopted as the cross-sectional shape of the leg 2 and the extensible leg 3. However, the cylindrical body is not limited to a cylindrical body as long as it is a cylindrical body. There may be. The same applies to other embodiments.

Next, the locking mechanism of the telescopic device will be described with reference to FIGS.
First, the outline of the locking mechanism and locking mechanism of the telescopic device will be briefly described with reference to FIG.
FIG. 2 is a longitudinal sectional view of the telescopic device according to the first embodiment.
In FIG. 2, in the telescopic device 1, first, in the hollow leg portion 2, a first inner cylinder portion 6 a having a stopper insertion window 7 and a second end portion extending to the other end side of the leg portion 2 are provided. The inner cylinder part 6 divided into two inner cylinder parts 6b is provided. A support rod 10 having one end connected to the knob 11 on the upper portion of the grip portion 12 is provided inside the upper portion of the inner cylinder portion 6. A connecting member 15, a lock member 16, and a stopper support member 20 are sequentially provided at the other end of the support bar 10. One end of the lock member 16 is inserted into the connecting member 15, and the lock member 16 is fixed to the connecting member 15 by a pin 17 that passes through the lock member 16 and the connecting member 15.
On the other hand, the other end of the lock member 16 is inserted into the stopper support member 20, and is connected to the lock member 16 by a pin 19 penetrating the stopper support member 20 and provided on the stopper support member. Further, on the other end side of the lock member 16, the pin 19 is slidable. Although not shown, a pair of opposed groove holes 18 are notched, and the lock member 16 is a groove hole of the pin 19. It can move up and down with 18 slide movements. That is, when the lock member 16 moves downward, the pin 19 appears to slide relatively upward, and when the lock member 16 moves upward, the pin 19 appears to slide relatively downward. The connecting member 15, the support rod 10, and the knob 11 connected to the lock member 16 also move up and down in conjunction with the operation of the lock member 16.
In FIG. 2, the distance between the knob 11 and the grip portion 12 corresponds to the length of the slot 18. The stopper 8 acts so as to protrude from the stopper insertion window 7 when the stopper support member 20 that supports the stopper 8 is rotated by a predetermined angle. The rotation of the stopper support member 20 is performed manually by the knob 11 and is transmitted through the support rod 10, the connecting member 15, and the lock member 16. Then, by moving the knob 11 downward, the lock member 16 also moves downward, abuts against the rear surface of the protruding stopper 8, prevents further rotation of the stopper 8, and a tension spring by the stopper 8. 4 can be ensured. In addition, a rotation stopper member 21 and the like related to the stopper 8 in and out of the stopper insertion window 7 are provided on the peripheral portion of the stopper support member 20.
Reference numeral 43 is the above-described tension spring fixing member, and the tension spring fixing member 43 is in contact with the upper end portion of the tension spring 4 and exhibits a function of suppressing the movement of the tension spring 4 and fixing it. Moreover, although it is rotation of the predetermined angle by the stopper support member 20, this angle is determined when manufacturing the expansion / contraction apparatus according to the present embodiment in advance, and unless it is determined to be a specific angle. It doesn't mean you can't be

Next, each part around the stopper will be described in detail with reference to FIGS.
Fig.3 (a) is an external view of the connection member of the expansion-contraction apparatus which concerns on 1st Embodiment, (b) is an arrow cross section of the part shown by the AA line in Fig.3 (a). It is a figure, (c) is arrow sectional drawing of the part similarly shown by the A1-A1 line in Fig.3 (a).
3A to 3C, the connecting member 15 is a hollow cylindrical body, and a pair of pin insertion holes 22a and 22b and a pair of pin insertion holes 23a and 23b are provided so as to face the connecting member 15, respectively. Is drilled. The pair of pin insertion holes 22a and 22b arranged on the upper side are pin insertion holes for inserting the pins and fixing them to the support rod described above. The pair of pin insertion holes 23a and 23b disposed below are pin insertion holes for inserting the pins and fixing them to the lock member.

Next, FIG. 4A is an outline view of the locking member of the telescopic device according to the first embodiment, and FIG. 4B is a diagram of the portion indicated by the line BB in FIG. It is arrow sectional drawing, (c) is arrow sectional drawing of the part similarly shown by B1-B1 line | wire in Fig.4 (a).
4A to 4C, the lock member 16 is a hollow cylindrical body, and a pair of opposed pin insertion holes 24a and 24b are formed above the lock member 16, and below the lock member 16. Is formed with a pair of opposed slots 18a, 18b. The pair of pin insertion holes 24a and 24b are for fixing the lock member 16 and the connecting member 15 shown in FIG. 3, and are inserted by inserting the upper end of the lock member 16 into the lower end of the connecting member. The pair of pin insertion holes of the member and the pair of pin insertion holes 24a and 24b of the lock member 16 are arranged so as to be continuous, and fixing is completed by inserting the pins into these insertion holes. Further, the pair of groove holes 18a and 18b support the pins inserted into the pin insertion holes of the stopper support member so as to be slidable.

Next, FIG. 5A is an outline view of the stopper support member of the telescopic device according to the first embodiment, and FIG. 5B is a portion indicated by the line CC in FIG. 5A. FIG. 5C is a sectional view taken along the line C1-C1 in FIG. 5A. FIG. 6A is a longitudinal sectional view of the first stopper connecting member of the telescopic device according to the first embodiment, and FIG. 6B is a top view of the first stopper connecting member. Moreover, Fig.7 (a) is a longitudinal cross-sectional view of the 2nd stopper connection member of the expansion-contraction apparatus based on 1st Embodiment, (b) is a top view of a 2nd stopper connection member similarly. FIG. 8 is an external view of the stopper of the telescopic device according to the first embodiment.
First, in FIGS. 5A to 5C, the stopper support member 20 is a hollow cylindrical body, and has a pin that slides over the pair of slots 18a and 18b of the lock member 16 shown in FIG. A pair of pin insertion holes 25a and 25b that can be inserted are formed. In particular, as shown in FIGS. 5B and 5C, a protrusion 27 is provided at the lower end of the stopper support member 20 to fix a stopper connecting member for connecting the stopper. A fixing hole 26 is formed for this purpose.
Next, in FIGS. 5 to 8, the first stopper connecting member 28 is disposed on the upper portion of the protruding portion 27, and the second stopper connecting member 31 is disposed on the lower portion of the protruding portion 27. The three fixing holes 26, the first fixing hole 29 of the first stopper connecting member 28, and the third fixing hole 32 of the second stopper connecting member 31 are inserted with pins (not shown) so that these three parts Are concatenated. Further, the first stopper connecting member 28 and the second stopper connecting member 31 are provided with the stopper 8 interposed therebetween, so that the second fixing hole 30 of the first stopper connecting member 28 and the second stopper connecting member 31 of the second stopper connecting member 31 are provided. A pin (not shown) is inserted into the four fixing holes 33 and the fifth fixing hole 34 of the stopper 8 to connect these three components.

FIG. 9A is a longitudinal sectional view of the first inner cylinder portion of the expansion / contraction apparatus according to the first embodiment, and FIG. 9B is a DD line in FIG. 9A. It is arrow sectional drawing of the done part. FIG. 10 (a) is an outline view of the rotation stop member of the telescopic device according to the first embodiment, and FIG. 10 (b) is shown by the line EE in FIG. 10 (a). It is arrow sectional drawing of a part.
9 (a) and 9 (b), the first inner cylinder portion 6a is partially provided with a stopper insertion window 7, and a seventh fixing hole 36 and an eighth fixing are respectively provided at the upper and lower positions of the stopper insertion window 7. The hole 37 protrudes from the inner peripheral part of the first inner cylinder part 6a. A sixth fixing hole 35 of the stopper 8 shown in FIG. 8 is arranged between the seventh fixing hole 36 and the eighth fixing hole 37, and a pin (not shown) is inserted into these continuous fixing holes. Thus, the stopper 8 is fixed.
Further, in FIG. 10, the rotation blocking member 13 has the first fixing hole opening 39 fitted in the seventh fixing hole 36 of the first inner cylinder portion 6a shown in FIG. The stopper support member 20 to which the first stopper connecting member 28, the second stopper connecting member 31, and the stopper 8 are attached is inserted into the inner cylinder portion 6a. However, at this time, the connecting member opening 38 becomes a space for the protruding first stopper connecting member 28 to rotate, and both end portions of the connecting member opening 38 are provided with the first stopper connecting member. Both end portions of 28 function to stop and prevent rotation. It is understood from FIG. 10 that the rotation about a predetermined angle in this embodiment is approximately 120 °.

Next, the case where the parts around the stopper are assembled will be described with reference to FIG.
FIGS. 11A to 11D are conceptual diagrams when the parts around the stopper of the telescopic device according to the first embodiment are assembled.
11 (a) and 11 (b), a stopper 8 protrudes from the stopper insertion window 7 of the first inner cylinder portion 6a. The stopper 8 is not shown on the one end side. The pin 40 is inserted and fixed to the eight fixing holes, the seventh fixing hole 36 and the eighth fixing hole 37 protruding from the first inner cylinder portion 6a. On the other hand, the fifth fixing hole 34 of the stopper 8 is shown on the other end side.
Further, in FIG. 11C, the lock member 16 is inserted into the upper end portion of the stopper support member 20, and the pin 19 is inserted into the pin insertion holes 25 a and 25 b of the stopper support member 20 and the groove hole 18 of the lock member 16. It is designed to be inserted. The protrusion 27 at the lower end of the stopper support member 20 is provided with a first stopper connecting member 28 at the upper part and a second stopper connecting member 31 at the lower part, and the first stopper connecting member 28. The first fixing hole 29, the third fixing hole 32 of the second stopper connecting member 31, and the fixing hole drilled in the protrusion 27 are inserted into the pin 41b. It has become.
11C is assembled in the first inner cylinder portion 6a shown in FIG. 11B. At this time, the fifth fixing of the stopper 8 is performed. The second fixing hole 30 of the first stopper connecting member 28 and the fourth fixing hole 33 of the second stopper connecting member 31 are arranged in the hole 34 so as to be continuous and fixed by the pin 41a. ing. Further, the lock member 16 and the stopper support member 20 of FIG. 11C are inserted into the second inner cylinder portion 6b and the rotation stop member 13 shown in FIG. The lower end portion of 13 is fitted to the upper end portion of the first inner cylinder portion 6a in FIG.

11A to 11C, when the lock member 16 is rotated, the stopper support member 20, the first stopper connecting member 28, the second stopper connecting member 31, and the stopper 8 are rotated in conjunction with each other. The stopper 8 can protrude from the stopper insertion window 7 or can be retracted to operate the stopper 8 in a locked state. As described above, the rotation is performed in a range in which both end portions of the first stopper connecting member 28 come into contact with both end portions of the connecting member opening 38.
Further, when the stopper 8 protrudes from the stopper insertion window 7, when the lock member 16 is pushed downward and the pin 19 is slid down along the groove 18, the peripheral portion of the lock member 16 becomes the back side of the stopper 8. Since the rotation of the stopper 8 is restrained by the contact, the pulling out of the gap between the pulling springs of the stopper 8 can be prevented. On the other hand, when the lock member 16 is pulled upward, the stopper 8 is unlocked, and the stopper 8 can be rotated to remove the thrust spring.
The fixing tool 9 shown in FIG. 11 (d) fixes one end of the push spring 5 and is fitted and fixed to the lower end of the first inner cylinder 6a of FIG. 11 (b). Is.

Next, the appearance and usage of the telescopic device will be described with reference to FIG.
FIG. 12 is an external view of the telescopic device according to the first embodiment.
In FIG. 12, the telescopic device 1 incorporated in the walking stick is provided on the leg 2, the telescopic leg 3 inserted in the leg 2, the grip 12 extending from the leg 2, and the grip 12. And a knob 11 for operating a stopper operation for locking and releasing a tension spring as a length adjusting member in the inside of the leg portion 2 and an operation of a locking member related to the stopper locking mechanism. ing. The reinforcing member 13 is extended from the grip portion 12 toward the upper end portion of the leg portion 2 and is fixed by a fixture 42 to reinforce the strength of the grip portion 12 to which an external force is applied.
In the telescopic device 1, when the knob 11 is pulled out, the stopper locked by the locking member described above is released. Subsequently, when the knob 11 is rotated by a predetermined angle, the stopper is released from the engagement with the thrust spring, so the telescopic leg 3 is pushed into the leg 2. When the total length is adjusted and the knob 11 is rotated in the reverse direction when the desired length is reached, the stopper is stuck to the pulling spring to be locked, and the length of the telescopic device 1 is fixed. Can do. Further, when the knob 11 is pushed and attached to the grip portion 12, the stopper 2 can be locked by the locking member inside the leg portion 2, so that the stopper can be prevented from being pulled out and firmly locked. Can be held. Since the knob 11 is fitted in the grip portion 12, it can be accommodated in the grip portion 12 only when it is in a parallel position with the grip portion 12. Therefore, it is possible to determine the abutment position and the release position of the locking portion on the basis of the position, and if the locking portion is not parallel to the gripping portion 12, the locking portion cannot be released. Can do.

  In the first embodiment configured as described above, since the stopper support member is provided inside the leg portion 2 and the telescopic leg portion 3, a shape in which no protrusion is provided on the peripheral portion of the telescopic device 1 is formed. Therefore, a walking stick having an excellent appearance can be configured. Further, since the lock mechanism for preventing the stopper from being pulled out is provided, the stopper is difficult to be pulled out even when an external force is applied, and the strength is improved.

Next, a second embodiment of the telescopic device according to the present invention will be described with reference to FIGS. (In particular, it corresponds to claim 2, claim 3 and claim 5)
FIG. 13 is a conceptual diagram showing the internal structure of the telescopic device according to the second embodiment of the present invention.
In FIG. 13, the telescopic device 51 according to the second embodiment includes a first leg 52 having an opening 52 a which is a hollow cylindrical body and one end is opened, and the first leg 52. A second leg 55 formed in a hollow cylindrical body that is similarly open at one end, and a hollow cylindrical body, but one end is not shown. A telescopic leg 53 having an open end, and a tension spring 54 as a length adjusting member is provided inside the telescopic leg 53 and inside the second leg 55. The outer circumference of the telescopic leg 53 is formed smaller than the inner circumference of the first leg 52, and the telescopic leg 53 is a space formed by the first leg 52 and the second leg 55, so-called double. It is configured so that it can be inserted into an annular space outside the circular tube and can slide freely. The inner periphery of the extendable leg 53 may be formed larger than the outer periphery of the first leg 52 and the first leg 52 may be inserted into the extendable leg 53.
Further, inside the other end portion side (that is, the upper end portion side) of the second leg portion 55, although not shown, an inner cylinder portion of a hollow cylindrical body is provided. Then, the push spring 56 as an expansion / contraction member abuts one end thereof on the other end side (that is, the upper end side) of the first leg portion 52 and the other end portion of the expansion / contraction leg portion 53. It is in contact with the other end side (that is, the lower end side) and is accommodated inside the first leg portion 52 and the telescopic leg portion 53 and outside the second leg portion 55. The push spring 56 is disposed outside the inner cylinder portion on the first leg portion 52 side, and is interposed between the extendable leg portion 53 and the tension spring 54 on the extendable leg portion 53 side. The tension spring 54 is disposed on the inner side of the push spring 56 and on the inner side of the second leg portion 55. Although not shown in the drawing, a stopper insertion window is provided in the inner cylinder portion, and further, a stopper protruding from the stopper insertion window and thrusting a pull spring is provided inside the inner cylinder portion, and a stopper of this stopper. A support member that is supported so as to be able to enter and exit the insertion window and a lock member that prevents the stopper from being pulled out are installed. In the case where the inner periphery of the extendable leg 53 is formed larger than the outer periphery of the first leg 52 and the first leg 52 is inserted into the extendable leg 53, the extendable leg 53 is only provided on the outside of the first leg 52, the push spring 56 is inside the first leg 52, the second leg 55 is inside, the tension spring 54 is inside, and the inside is inside it. An inner cylinder part will be formed. Reference numeral 57 denotes an upper end tool installed at the upper end of the first leg portion 52, and reference numeral 58 denotes a lower end tool installed at the lower end of the telescopic leg portion 53.

In the telescopic device 51, when the telescopic leg 53 is pushed toward the first leg 52, the telescopic leg 53 is inserted into the first leg 52. At this time, the push spring 56 is compressed and the telescopic leg 53 slides in the space formed between the first leg 52 and the second leg 55. Then, when the telescopic device 51 reaches a desired length, the telescopic leg 53 is fixed by operating the support portion to pinch and lock the gap between the tension springs located in the stopper insertion window with the stopper. And the length of the telescopic device 51 can be determined. On the other hand, when the telescopic device 51 is extended, when the stopper impact is removed by operating the support portion, the telescopic leg 53 is automatically biased by the restoring force of the push spring 56 and the first leg 52 is automatically pulled. Can be extended.
In the telescopic device 51 according to the second embodiment, the stopper locking mechanism and the locking mechanism are the same as those in the first embodiment, and a detailed description thereof will be omitted.
In the second embodiment, the push spring 56 is disposed from the first leg portion 52 to the telescopic leg portion 53, so that the inner cylinder portion and the push spring are connected as in the first embodiment. Compared with the case where they are arranged in series, the expansion / contraction width of the expansion / contraction device 51 can be increased.

Next, FIG. 14A is an outline view of the telescopic device according to the second embodiment, and FIG. 14B is a top view of the telescopic device.
In FIG. 14A, as described above, the expansion / contraction device 51 includes the first leg portion 52 and the expansion / contraction leg portion 53, and the expansion / contraction leg portion 53 moves in and out of the first leg portion 52. It has become. In FIG. 14B, when the upper end tool 57 of the telescopic device 51 is viewed from the upper surface, a knob 59 is formed on the upper end tool 57. The knob 59 is connected to the stopper support member and the lock member described above. By the operation of the knob 59, the stopper is locked and released, and the lock for preventing the stopper from being pulled out and the lock Release can be made.

  In the second embodiment configured as described above, the stopper is engaged with the pulling spring by the inner cylinder portion installed inside the pulling spring, and the operation is performed on the end portion of the second leg portion 55. Therefore, the leg peripheral portion can be formed in a shape having no protrusion without providing a locking member on the peripheral portion of the leg portion as in a conventional telescopic device. In addition, since the lock mechanism for preventing the stopper sticking from being removed is provided, the length of the telescopic device can be reliably fixed. Furthermore, since the inner cylinder part is installed inside the push spring, compared to the case where the push spring and the inner cylinder part are arranged in series as in the first embodiment, the length of the inner cylinder part that cannot be expanded and contracted is the same. Can be expanded and contracted, and an expansion / contraction apparatus having an increased expansion / contraction length can be provided.

Next, a third embodiment of the telescopic device according to the present invention will be described with reference to FIGS. (In particular, it corresponds to claim 1, claim 4 and claim 5.)
FIG. 15 is a conceptual diagram showing the internal structure of the telescopic device according to the third embodiment of the present invention.
In FIG. 15, the telescopic device 61 according to the third embodiment includes a leg portion 62 having an opening 62 a which is a hollow cylindrical body and one end portion is open, and a hollow cylindrical body and one end. The telescopic leg part 63 which the part opened is comprised, and the telescopic leg part 63 can be inserted in the inside of the leg part 62, and is comprised so that it can slide freely. Although the outline drawing is omitted, it has almost the same appearance as that of the first embodiment, and can be used for a stick or the like.
In addition, a hollow cylindrical inner tube portion 66 is installed inside the leg portion 62. A fixing tool 70 is fitted on the lower end portion of the inner cylinder portion 66, and a pressing spring 65 as an elastic member is fixed at one end so as to be arranged in series with the inner cylinder portion 66. Although not shown, the other end of the push spring 65 is accommodated in contact with the lower end of the telescopic leg 63. A tension spring 64 as a length adjusting member is provided on the outer peripheral portion of the inner cylinder portion 66 and the pressing spring 65. The tension spring 64 is housed and fixed in a tension spring fixing member 69 provided in the leg portion 62 and extending at the tip end portion of the telescopic leg portion 63.
The inner cylinder portion 66 includes a pair of guide plates 71a and 71b, a pair of rotating plates 72a and 72b, and a first stopper 67a and a second stopper 67b provided with a fixing member 73, although not shown. A third stopper is provided. Each of the first stopper 67a, the second stopper 67b, and the third stopper has a shape in which the abutting portions 68 each including a disc-shaped protrusion having a cross section formed at an acute angle are stacked in five stages. When the first stopper 67a, the second stopper 67b, and the third stopper move from the inner peripheral portion of the inner cylindrical portion 66 to the outside, the portion 68 simultaneously pierces the gap of the tension spring 64 at four locations. The length of the expansion / contraction device 61 is determined by locking and suppressing the movement of the expansion / contraction leg 63 and the push spring 65. The details of the locking mechanism will be described later.

Here, FIG. 16 is a conceptual diagram showing the internal structure of the telescopic device according to the third embodiment of the present invention. In FIG. 16, the same parts as those shown in FIG. 15 are denoted by the same reference numerals, and description of the configuration will be omitted.
In FIG. 16, a support rod 74 is installed inside the inner cylinder portion 66, and this support rod is rotated by a predetermined angle in the direction of the arrow in the figure, whereby the first shown in FIG. The movement of the first stopper 67a and the second stopper 67b from the inner peripheral portion of the inner cylindrical portion 66 to the outside and the movement from the outer portion to the inner peripheral portion of the inner cylindrical portion 66 are operated. Although not shown, the support rod 74 extends to the other end of the leg (that is, the upper end side), and the inner cylindrical portion 66 of the first stopper 67a and the second stopper 67b. The operation of entering and exiting from the inner peripheral part to the outside is possible at the position of the other end part of the leg part.

Subsequently, a locking mechanism of the telescopic device according to the third embodiment will be described with reference to FIG.
Fig.17 (a) is a conceptual diagram at the time of seeing the state which the stopper of the expansion-contraction apparatus based on 3rd Embodiment is not latching from upper direction.
In FIG. 17A, the first stopper 67a, the second stopper 67b, and the third stopper 67c are in an unlocked state, and all of them are not in contact with the pulling spring 64, and the inner cylinder portion (not shown). ) Are evenly arranged in a substantially triangular shape.
On the other hand, FIG.17 (b) is a conceptual diagram at the time of seeing the state which the stopper of the expansion-contraction apparatus concerning 3rd Embodiment latched from upper direction.
In FIG. 17B, the first stopper 67a, the second stopper 67b, and the third stopper 67c are in a locked state and move outward from the inner peripheral portion of the inner cylinder portion (not shown). Each is inserted in a tension spring 64. That is, although not shown, the first stopper 67a, the second stopper 67b, and the third stopper 67c are a plurality of the aforementioned abutting portions (the first to third stoppers appear circular in the figure). At the end, a portion represented by reference numeral 68 (see FIGS. 15 and 17E) pierces a plurality of gaps of the tension spring 64 at the same time.

FIG. 17C is a conceptual diagram when a guide plate is mounted on the stopper of the telescopic device according to the third embodiment.
In FIG. 17C, the guide plate 71a has three substantially elliptical first guide holes 75a, 75b, 75c. The shafts of the first stopper 67a, the second stopper 67b, and the third stopper 67c are inserted into these guide holes so that the guide holes can slide. That is, when the shafts of the first stopper 67a, the second stopper 67b, and the third stopper 67c are at the outer positions of the first guide holes 75a, 75b, and 75c as shown in the drawing, the first stopper 67a. The second stopper 67b and the third stopper 67c are located outside from the inner peripheral portion of the inner cylinder portion and pierce the tension spring 64. Conversely, when the shafts of the first stopper 67a, the second stopper 67b, and the third stopper 67c are at the inner positions of the first guide holes 75a, 75b, and 75c, the first stopper 67a and the second stopper 67a The stopper 67b and the third stopper 67c are located on the inner peripheral portion of the inner cylinder portion, and the tension spring 64 is not stabbed. Although not shown, a guide plate having the same shape as the guide plate 71a is also provided below the first stopper 67a, the second stopper 67b, and the third stopper 67c, and is similar to the guide plate 71a. Has structure and function.

FIG. 17D is a conceptual diagram when a guide plate and a rotating plate are attached to the stopper of the telescopic device according to the third embodiment.
In FIG. 17 (d), the guide plate 71a of FIG. 17 (c) is installed on top of the first stopper 67a, the second stopper 67b and the third stopper 67c, and further on the guide plate 71a. A rotating plate 72a is installed. The rotating plate 72a is provided with three substantially elliptical second guide holes 67a, 67b, 67c. The shafts of the first stopper 67a, the second stopper 67b, and the third stopper 67c are formed. However, these guide holes are slidably inserted. The rotating plate 72a can be rotated clockwise and counterclockwise. When the rotating plate 72a is rotated by a predetermined angle, the first stopper 67a, the second stopper 67b, and the third stopper 67c. The shafts of the first stopper 67a, the second stopper 67b, and the third stopper 67c move below the rotating plate 72a. The first guide holes 75a, 75b, 75c of the installed guide plate 71a can be slid. That is, by turning the rotating plate 72a, the first stopper 67a, the second stopper 67b, and the third stopper 67c can be operated to enter and exit from the inner peripheral portion of the inner cylinder portion. As with the guide plate, although not shown in the figure, a rotating plate 72a having the same shape as the rotating plate 72a is provided below the first stopper 67a, the second stopper 67b, and the third stopper 67c via the guide plate 71b. A moving plate 72b is installed and has the same structure and function as the rotating plate 72a.

Next, FIG. 17 (e) is a conceptual diagram when a guide plate is attached to the stopper of the telescopic device according to the third embodiment.
In FIG. 17E, a guide plate 71a and a guide plate 71b are installed at both ends of the first stopper 67a, the second stopper 67b, and the third stopper 67c, and the first guide hole 75a of the guide plate 71a. , 75b, 75c are inserted through respective shafts. Further, the first stopper 67b and the third stopper 67c are shown with side surfaces, and it can be seen that a plurality of stabs 68 stacked in four stages are formed.

And FIG.17 (f) is a conceptual diagram when the stopper of the expansion-contraction apparatus which concerns on 3rd Embodiment is installed in the inner cylinder part.
In FIG. 17 (f), the first stopper 67a, the second stopper 67b, and the third stopper 67c are installed at the end portion of the inner cylinder portion 66 with the guide plate and the rotation plates 72a and 72b attached thereto. Yes. Although not shown, a support bar provided in the inner cylinder portion 66 is fixed to the rotating plate 72a. Further, the support bar is extended to the end of the leg part. When the end part is manually rotated, the rotation plate 72a is rotated in conjunction with the rotation of the support bar, as described above. The first stopper 67a, the second stopper 67b, and the third stopper 67c enter and exit from the inner peripheral portion of the inner cylindrical portion 66, and pierce the tension spring.

In the present embodiment configured as described above, the stopper includes a plurality of stabs, and a plurality of gaps of the tension springs are stabbed and locked at the same time, so that the expansion and contraction legs are firmly fixed. . Furthermore, by providing a multi-stage stopper, it is possible to stably hold a stronger locking state.
Further, as in the first and second embodiments, since the stopper has a structure that enters and exits from the inner peripheral portion of the inner cylindrical portion, the substantially cylindrical expansion and contraction device is formed without forming protrusions on the peripheral portion of the leg portion. Can be provided.
In this embodiment, three stoppers are installed. However, the number of stoppers can be freely set as long as the number of stoppers is one or more. However, if a plurality of stoppers are provided and they are evenly arranged in the circumferential direction, an even holding force is generated in the circumferential direction, so that a more reliable expansion / contraction device can be provided. The number of the abutment portions formed on the stopper is not particularly limited, and may be one or more.

Next, a fourth embodiment of the telescopic device according to the present invention will be described with reference to FIGS. (In particular, it corresponds to claims 6 to 8)
FIG. 18 is a front view of a telescopic device according to the fourth embodiment of the present invention.
In FIG. 18, the telescopic device 81 according to the fourth embodiment is provided with a leg portion 82 having a curved shape near one end portion, and a stopper as a locking member (not shown) provided on the leg portion 82. And a supporting portion 86 that has Although not shown in the figure, a groove hole is formed on the back side of the curved portion near one end of the leg portion 82, and the groove portion slides into the inside of the leg portion 82. , And one end of the action portion is fixed in series, and a tension spring is installed as a length adjusting member that can slide inside the leg portion 82. Further, a fixed portion having both ends fixed to the action portion and the other end of the pull spring is inserted into the pull spring. The tension spring installed inside the leg portion 82 is disposed beyond the window portion provided around the reinforcing member 88, and the gap between the tension springs located in the window portion is moved in and out by the support portion 86 including the handle 87. The locking member to be operated can be stabbed and locked, and the movement of the pull spring can be suppressed to determine the position of the action portion. Although the locking mechanism will be described later, the locking in the present embodiment is such that the locking member disposed outside the tension spring 85 moves inward to puncture the gap of the tension spring 85. . The action part is fixed to a rotating member 94 connected to the back skeleton 92 of the back part 91 of the seat 90 of an automobile or the like via a connection member 93, that is, the back part is changed by changing the position of the action part. The angle of 91 can be adjusted. In addition, the arrow in a figure shows the movable range of the back part 91. FIG.
In the sheet 90, reference numerals 95 and 96 are fixing screws for fixing the connecting member 93 and the rotating member 94. In addition, a seat frame 98 is installed on the seat 97, and a connecting member 99 that supports the rotating member 94 is fixed to the seat frame 98 with a fixing screw 100 and a fixing screw 101. A frame 103 including a slide member 104 fixed by the couplers 105 and 106 is installed below the seat frame 98, and the slide member 104 slides on the rail 107 on the rail fixing member 108. The seat 90 can be changed in the front-rear position.

Next, FIG. 19 is a rear view of the telescopic device according to the fourth embodiment. That is, it is a drawing depicting the back side of the state shown in FIG. FIG. 20 is an enlarged conceptual diagram showing the periphery of the action part of the expansion and contraction device according to the fourth embodiment. In FIG. 19, the same parts as those shown in FIG. 18 are denoted by the same reference numerals, and description of the configuration is omitted.
In FIG. 19, when the telescopic device 81 is viewed from the back side, a groove 84 is formed in the curved portion of the leg portion 82, and an action portion 83 that can slide the groove 84, and this action portion 83. A tension spring 85 having one end fixed thereto is installed.
In FIG. 20, a cover 110 is actually attached to a curved portion of the leg portion 82, and is fixed to a rotating member at the back portion of the seat by fixing screws 111 to 117. In the slot 84 of the leg portion 82, an action portion 83 is provided that projects a circular portion to the outside of the slot 84 and accommodates a substantially elliptical portion in the slot 84. Has been. In addition, a tension spring 85 in which one end is fixed to the action portion 83 is accommodated inside the leg portion 82, and one end is provided in the action portion 83 inside the tension spring 85. A fixed wire 109 is inserted. As described above, the other end portion of the wire 109 is fixed to the other end portion of the pulling spring 85, so that the pulling spring 85 is moved when the pulling spring 85 is moved along with the sliding movement of the slot 84 of the action portion 83. Since the wire 109 is fixed by the wire 109, a dense state can be maintained without generating a space in the gap between the tension springs 85.

In the present embodiment, the elastic member is not installed, but the elastic member can be installed. The expansion / contraction member can be arranged in series on the side where the tension spring 85 is not fixed with respect to the action portion 83. In this case, a push spring is used as the extension / contraction member, and one end portion is the action portion 83. The other end is installed so as to be fixed or abutted against the end of the leg portion 82. 19 and 20, when the action portion 83 is locked in a state in which the slot 84 is slid and moved to the push spring side, the other end portion of the push spring is fixed or abutted on the end portion of the leg portion 82. Therefore, it is in a compressed state. Therefore, when the locked state is released, the action portion 83 can be easily returned to the original position by being urged by the restoring force of the pressed spring. That is, the back portion of the seat can be automatically moved.
The elastic member can also be arranged in parallel inside the tension spring 85. In this case, the tension spring can be used as the elastic member. As described above, since the locking of the present embodiment is a mechanism in which the locking member stabs from the outside of the tension spring, it is essential that the tension spring as the elastic member is installed inside the tension spring 85. Become. The tension spring as the expansion / contraction member is installed by fixing one end portion to the action portion 83 and fixing the other end portion to the other end portion of the leg portion 82. 19 and 20, when the action portion 83 slides in the slot 84, the tension spring as the expansion / contraction member is normally densely formed, and the other end is the other end of the leg 82. Since it is fixed at the end, it is extended by being pulled. When the locked state in the expanded state is released, a restoring force acts on the tension spring as the elastic member so as to close the expanded gap, and the action portion 83 can easily return to the original position. That is, the back portion of the seat can be automatically moved.

Next, a description will be given of a locking structure of the telescopic device according to the fourth embodiment with reference to FIGS.
FIG. 21 is a conceptual diagram of the periphery of the support portion of the telescopic device according to the fourth embodiment.
In FIG. 21, the support part 86 is installed on the reinforcing member 88 of the leg part 82, and supports the handle 87, the first stopper 120, the second stopper 121, and the third stopper (not shown). A pair of support plates 124a, 124b and a connecting member 125, a pair of rotating plates 123a, 123b for operating the first stopper 120, the second stopper 121, and a third stopper (not shown) in and out, and a pair Handle supporting portions 118 and 119 for connecting the supporting plates 124a and 124b to the handle 87, and fixing members 126a and 126b. Then, from the gap between the first stopper 120 and the second stopper 121, the tension spring 85 inserted into the leg portion 82 is exposed, and the first stopper 120, the second stopper 121, and the third stopper are exposed. A window portion (not shown) is provided to allow entry and exit in order to pierce the gap of the tension spring 85.
Each of the first stopper 120 and the second stopper 121 has a structure in which four stages of thrusting portions 102 are stacked, and these four stages of thrusting portions 102 are the four gaps of the tension spring. It can be stabbed and locked at the same place at the same time. Although not shown, the third stopper has the same structure. Therefore, in the present embodiment, the three first stoppers 120, the second stoppers 121, and the third stoppers are used to stab the tension springs at four locations, so that a strong locking state is maintained. Can do. The number of stoppers installed and the number of formation stages of the abutment portions are not particularly limited as long as they are one or more.

FIG. 22A is a perspective view around the support portion of the telescopic device according to the fourth embodiment, and FIG. 22B is a conceptual diagram for explaining the stopper locking mechanism. In FIG. 22, the same parts as those shown in FIG. 21 are denoted by the same reference numerals, and description of the configuration will be omitted.
22A, the handle 87 can be rotated in the direction of the arrow shown in the drawing, and the pair of rotating plates 123a and 123b can be similarly rotated in conjunction with the operation of the handle 87.
In FIG. 22B, the rotating plate 123a is provided with a first guide hole 130, a second guide hole 131, and a third guide hole 132. The shafts of the second stopper 121 and the third stopper 122 are inserted so as to be in contact with one end of these guide holes. When the rotating plate 123a rotates, the shafts of these stoppers slide from one end of each guide hole to the other end, and the stopper itself also moves from the outside to the inside of the rotating plate 123a. It moves toward, and it strikes to the gap of the pulling spring by the thrusting portion of the stopper, and it is in the locked state. Conversely, to release the locked state by the stopper, when the rotating plate 123a is rotated in the reverse direction, the stopper moves from the inside to the outside, and the abutment of the abutment portion of the stopper is removed. be able to. In addition, although not shown in figure, the rotation board which makes the pair of rotation board 123a also has the same structure and function.
In FIG. 22A, reference numerals 128 and 129 are fixing screws, and reference numeral 127 is a connecting member. Moreover, in FIG.22 (b), the code | symbol 133, the code | symbol 134, and the code | symbol 135 are fixing screws.

  In the present embodiment configured as described above, it is possible to provide a telescopic device having a curved structure without being limited to a linear shape. Moreover, since the stopper provided with a some stab part is provided and the several space | gap of a tension spring is latched simultaneously, a strong latching state can be hold | maintained.

  As described above, the invention described in claims 1 to 8 of the present invention can be adjusted to a desired length, and the extension device capable of securely and reliably locking the length adjusting member. And can be used in a walking stick or a chair.

DESCRIPTION OF SYMBOLS 1 ... Telescopic device 2 ... Leg part 2a ... Opening part 3 ... Telescopic leg part 4 ... Pulling spring 5 ... Push spring 6 ... Inner cylinder part 6a ... First inner cylinder part 6b ... Second inner cylinder part 7 ... Stopper insertion Window 8 ... Stopper 9 ... Fixing tool 10 ... Supporting rod 11 ... Knob 12 ... Holding part 13 ... Reinforcing member 14 ... Lower end tool 15 ... Connecting member 16 ... Locking member 17 ... Pin 18, 18a, 18b ... Slot 19 ... Pin 20 ... stopper support member 21 ... rotation blocking member 22a, 22b ... pin insertion hole 23a, 23b ... pin insertion hole 24a, 24b ... pin insertion hole 25a, 25b ... pin insertion hole 26 ... fixing hole 27 ... projection 28 ... first 1 stopper connecting member 29 ... first fixing hole 30 ... second fixing hole 31 ... second stopper connecting member 32 ... third fixing hole 33 ... fourth fixing hole 34 ... fifth fixing hole 35 ... Sixth fixing hole 36... Seventh fixing 37 ... 8th fixing hole 38 ... Opening part for connecting member 39 ... Opening part for fixing hole 40 ... Pin 41a, 41b ... Pin 42 ... Fixing tool 43 ... Pulling spring fixing member 51 ... Telescopic device 52 ... First leg part 52a ... opening 53 ... telescopic leg 54 ... tension spring 55 ... second leg 56 ... push spring 57 ... upper end tool 58 ... lower end tool 59 ... knob 61 ... telescopic device 62 ... leg part 62a ... opening 63 ... telescopic Leg part 64 ... Pull spring 65 ... Push spring 66 ... Inner cylinder part 67a ... First stopper 67b ... Second stopper 67c ... Third stopper 68 ... Striking part 69 ... Pulling spring fixing member 70 ... Fixing tool 71a, 72b ... guide plates 72a, 72b ... rotating plates 73 ... fixing members 74 ... support rods 75a, 75b, 75c ... first guide holes 76a, 76b, 76c ... second guide holes 81 ... expandable devices 82 ... legs 8 DESCRIPTION OF SYMBOLS 3 ... Protrusion 84 ... Groove hole 85 ... Pulling spring 86 ... Support part 87 ... Handle 88 ... Reinforcement member 90 ... Seat 91 ... Back part 92 ... Back part frame | skeleton 93 ... Connecting member 94 ... Turning member 95 ... Fixing screw 96 ... Fixing screw 97 ... Seat part 98 ... Seat part frame 99 ... Connecting member 100 ... Fixing screw 101 ... Fixing screw 102 ... Pricking part 103 ... Frame 104 ... Slide member 105 ... Connecting tool 106 ... Connecting tool 107 ... Rail 108 ... Rail fixing member 109 ... Wire 110 ... Cover 111 ... Fixing screw 112 ... Fixing screw 113 ... Fixing screw 114 ... Fixing screw 115 ... Fixing screw 116 ... Fixing screw 117 ... Fixing screw 118 ... Handle support part 119 ... Handle support part 120 ... First stopper 121 ... 2nd stopper 122 ... 3rd stopper 123a, 123b ... Rotating plate 124a, 12 4b ... support plate 125 ... connecting member 126a, 126b ... fixing member 127 ... connecting member 128 ... pin 129 ... pin 130 ... first guide hole 131 ... second guide hole 132 ... third guide hole 133 ... pin 134 ... Pin 135 ... pin

Claims (8)

  A leg portion that is formed in a hollow cylindrical shape and has one end opened, and a tip portion is inserted or extrapolated into the one end opened by the leg, and is slidable inside or outside the leg. A telescopic leg portion formed in a tubular shape, an inner tubular portion formed in a hollow tubular shape and provided on the other end side of the leg portion, and disposed in series with an end portion of the inner tubular portion, A helically formed telescopic member accommodated in the telescopic leg part, and a helically formed length that is fixed at both ends in the telescopic leg part and disposed on the outer peripheral part of the inner cylinder part and the elastic member. A length adjusting member, at least one provided in the inner cylindrical portion, a locking portion that enters and exits from an inner peripheral portion of the inner cylindrical portion, and is provided in the inner cylindrical portion, The locking portion is supported so as to be able to enter and exit from the inner peripheral portion of the inner cylinder portion, and an end portion of the locking portion extends to the other end portion of the leg portion. Extension device characterized in that it comprises a supporting portion that allows input operation at the position of the other end of the leg portion.   A first leg that is formed in a hollow cylinder and has one end opened; a second leg that is provided in the first leg and is formed in a hollow cylinder and has one end opened; A telescopic leg portion that is formed in a hollow cylindrical shape that has a distal end portion inserted in a space formed by opening between the first leg portion and the second leg portion, and that is slidable in the space. An inner cylindrical portion that is formed in a cylindrical shape and is provided on the other end side of the second leg portion; an outer side of the second leg portion; and an inner side of the first leg portion and the telescopic leg portion And one end portion is disposed inside the first leg portion, the other end portion is disposed inside the telescopic leg portion, and a telescopic member formed in a spiral shape, and both ends in the telescopic leg portion. A length adjusting member formed in a spiral shape disposed in a space formed between the inner tube portion and the second leg portion, and at least one is provided in the inner tube portion, A locking part that enters and exits from the inner peripheral part of the inner cylinder part and pierces the length adjusting member, and is provided on the inner cylinder part, so that the locking part can enter and exit from the inner peripheral part of the inner cylinder part A support portion, the end portion of which extends to the other end portion of the second leg portion, and allows the locking portion to be moved in and out at the position of the other end portion of the leg portion; A telescopic device characterized by comprising:   3. The device according to claim 1, further comprising: a lock member that is detachably provided in the inner cylinder portion and that can prevent and release the locking portion by the insertion / removal operation. Telescopic device.   The said latching | locking part is provided with the stab member which stabs simultaneously in the space | interval of the several spiral of the length adjustment member formed in the said spiral at at least two places, The Claim 1 or Claim 2 characterized by the above-mentioned. The telescopic device described.   The expansion / contraction apparatus according to claim 1, wherein the length adjusting member is a pulling spring or a pressing spring, and the expansion / contraction member is a pressing spring.   A leg portion that is configured as a hollow cylinder and includes a window portion in a part thereof and a groove portion that is formed along a longitudinal direction, and a portion that is disposed inside the leg portion and protrudes from the groove portion, and the groove portion An action part that can slide and slide inside the leg part, a length adjusting member formed in a spiral shape with one end part fixed to the action part in series, and the spiral shape The length adjustment member is inserted into the length adjustment member, and both ends thereof are fixed to the other end of the length adjustment member, the fixed portion fixed to the action portion, and the spiral in the window portion provided in the leg portion. A locking portion that punctures a plurality of spiral gaps of the length adjusting member formed in a shape at least in one place, and a support portion that supports the locking portion so as to be able to enter and exit from the outside of the window portion. A telescopic device characterized by that.   In the inside of the leg portion configured in the hollow cylindrical shape, an expansion / contraction member is arranged in series on the side where the length adjusting member is not fixed with respect to the action portion, or in parallel in the length adjusting member. The expansion / contraction apparatus according to claim 6. The telescopic device according to claim 7, wherein the length adjusting member is a tension spring or a push spring, and the telescopic member is a push spring or a tension spring.