JPH09206115A - Long-sized object freely adjustable in elongation and expansion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the missing of an expander by providing the front end of a screw shaft penetrating the expander with a stopper for prohibiting the detachment of the expander from the front end of this screw shaft. SOLUTION: The base end of the screw shaft 161 is coaxially fixed to one end of a second pipe 122 which is a small-diameter side of the pairing first and second pipes 121 , 122 expandably and contractably mounted at each other and is friction engaged with the inside surface of the first pipe 121 which is the large-diameter side. The expander 171 which increases friction engaging force at the time of diameter expansion is expandably and contractably formed and is inserted into the first pipe 121 . Between the expander 171 and the screw shaft 161 is provided with an expansion and contraction mechanism 181 for expanding and contracting the expander 171 according to the turning action of the second pipe 122 with respect to the first pipe 121 . The stopper 271 which prohibits the detachment of the expander 171 from the front end of the screw shaft 161 by engaging and coming into contact with the expander 171 is fixed to the front end of the screw shaft 161 , i.e., a small-diameter threaded apart 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-diameter side pipe in which the base end of a screw shaft is coaxially fixed to one end of the small-diameter side pipe of the large and small pipes fitted in a mutually expandable and contractible manner. An expander that is frictionally engaged with the inner surface of the pipe and expands and expands the friction engagement force when expanding the diameter is inserted into the pipe on the large diameter side, and between the expander and the screw shaft, The present invention relates to a long and slender adjustable object provided with an expansion / contraction mechanism for expanding / contracting the expander according to the rotation operation of the small diameter side pipe with respect to the large diameter side pipe, and is particularly suitable for a stick, a stock, a camera support leg, and the like. Regarding long objects.

[0002]

2. Description of the Related Art Conventionally, such a long product is already known, for example, from Japanese Utility Model Laid-Open No. 63-120916.

[0003]

By the way, the length of such a long object can be shortened so that it can be carried easily, but in order to further shorten the overall length, a plurality of pipes are required. Can also be separated from each other. However, in the above-mentioned conventional one, the taper portion provided at the tip of the screw shaft screwed into the expander is used to expand the diameter of the expander, and the screw shaft can be separated from the expander. Has become. For this reason, when each pipe is separated, the expander remains in the pipe or is screwed to the screw shaft, and the expander is separated from the pipe or screwed with the screw shaft in that state. There is a risk that it will be lost as a result of being canceled.

The present invention has been made in view of the above circumstances, and provides an elongated member which is adjustable in expansion and contraction so that the expander can be surely prevented from being lost even if the pipes are separated from each other. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that one end of the small-diameter side pipe is screwed to one of the large and small pipes that are fitted to each other so as to extend and contract. The base end of the shaft is fixed coaxially, frictionally engages the inner surface of the large-diameter side pipe, and an expander that expands and expands the frictional engagement force when expanding is inserted into the large-diameter side pipe. In the elongated object which is adjustable in expansion and contraction, between the expander and the screw shaft, there is provided an expansion / contraction mechanism for expanding / contracting the expander according to the rotational movement of the small diameter side pipe with respect to the large diameter side pipe. The end of the screw shaft that penetrates the expander is provided with a stopper that prevents the expander from separating from the end of the screw shaft.

[0006] The second aspect of the present invention is the first aspect of the present invention.
In addition to the configuration of the invention described, the expander has a cylindrical base portion to which a screw shaft is screwed, and a distal end side of the large diameter pipe can be expanded / contracted along the radial direction of the pipe to expand / contract the base portion. The expansion / contraction unit has a plurality of expansion / contraction units whose base ends are integrally connected to each other at a plurality of intervals in the circumferential direction.The expansion / contraction mechanism has a tapered outer surface whose diameter increases toward the small diameter side pipe. And a pressure receiving surface provided on the inner surface side of each expansion / contraction portion so as to be able to contact the outer surface of the pressing portion.

Further, in the invention described in claim 3, in addition to the constitution of the invention described in claim 1, the expander has a cylindrical base portion to which a screw shaft is screwed, and a radial direction of the pipe on the large diameter side. It is possible to make the distal end side expand / contract along, and the expansion / contraction part in which the base end is integrally connected to a plurality of places spaced apart in the circumferential direction of the base part on the side opposite to the small diameter side pipe, The expansion / contraction mechanism has a taper-shaped outer surface that becomes smaller in diameter toward the small-diameter side pipe, and is able to abut on the outer surface of the pressing portion, which is also provided as a stopper and is integrally provided at the tip of the screw shaft. And a pressure receiving surface provided on the inner surface at the tip end side of each expansion / contraction portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a side view of a stick in an extended state, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 3 is 3 in FIG.
3 is a sectional view taken along line -3, FIG. 4 is an enlarged perspective view of a main part of FIG. 2, and FIG. 5 is a sectional view corresponding to FIG. 2 in a state where the expander has a reduced diameter.

First, in FIG. 1, a step as a long object is
The key 11 is a first and a first that are fitted to each other to enable expansion and contraction.
2 and 3 pipe 12₁, 12_Two, 12_ThreeEquipped with
And the inner and outer diameters of the first pipe 12₁Smaller than
2nd pipe 12_TwoIs that one end side (upper end side in FIG. 1)
The first pipe 12₁Fitted on the inner and outer diameter of the second pipe
12_TwoThird pipe 12 made smaller than_ThreeIs one end
The second pipe 12 from the side (the upper end side in FIG. 1)_TwoFitted into
You. Moreover, the first pipe 12₁At one end (top of Figure 1)
The grip 13 is provided and the first pipe 12 is provided.₁At the other end of
Is the first pipe 12 ₁Second pipe 12 fitted inside_Two
Rubber cap 14 sliding on the outer surface of the₁Is provided,
Second pipe 12_TwoThe other end of the second pipe 12_TwoFit inside
Third pipe 12 mounted_ThreeThe rubber key that slides on the outer surface of the
Up 14_TwoIs provided, and the third pipe 12_ThreeOn the other end of
A slip stopper 15 is provided.

Referring also to FIGS. 2, 3 and 4,
First and second pads that are fitted to each other so as to be able to extend and contract
Ip 12₁, 12_TwoSecond pipe 12 which is the smaller diameter side of
_TwoScrew shaft 16 at one end₁The base end of is fixed coaxially,
The first pipe 12 on the radial side₁When frictionally engaged with the inner surface of
Expander 1 that strengthens the frictional engagement force when expanding the diameter
7₁Is formed so as to be expandable and contractible, and the first pipe 12₁Inserted into
Expander 17 ₁And screw shaft 16₁First between
Pipe 12₁Second pipe to_TwoRotation of
Expander 17₁Expansion / contraction mechanism 18 for expanding / contracting₁
Is provided.

The screw shaft 16 ₁ has a large-diameter press-fitting portion 19 on the base end side, and a large-diameter press-fitting portion 19 on the distal end side through a pressing portion 20 ₁ formed in a taper shape whose diameter increases toward the second pipe 12 ₂ side. The screw shaft 16 ₁ is coaxially and integrally connected to the small-diameter screw portion 21, and the base end portion of the screw shaft 16 ₁ , that is, the large-diameter press-fitting portion 19 is press-fitted into one end of the second pipe 12 ₂ . At this time, in order to further secure the fixation of the screw shaft 16 ₁ to the second pipe 12 ₂ , it is possible to caulk the second pipe 12 ₂ with the large-diameter press-fitting portion 19 being press-fitted into the second pipe 12 _2. Diameter press fitting part 19
May be engaged with.

[0013] expander 17 ₁ includes a cylindrical base portion 22 ₁ made of synthetic resin, the base end as allowing allowed to scaling actuating the distal end side along the first radial direction of the pipe 12 ₁ of the base 22 ₁ Expanding / contracting portion 23 made of synthetic resin and integrally formed at a plurality of places, for example, four places, which are spaced apart in the circumferential direction.
₁ , 23 _1, ... and the base portion 2 formed of a metal in a cylindrical shape.
2 ₁ is integrally embedded in the collar 25, and each expansion / contraction part 23 ₁ , 23 ₁ ... Is arranged on the side of the second pipe 12 ₂ and fitted in the first pipe 12 ₁ . Moreover, the expansion / contraction part 2 is provided at the tip of each expansion / contraction part 23 ₁ , 23 ₁ ...
A lip 2 that exerts a frictional engagement force by elastically slidingly contacting the inner surface of the first pipe 12 ₁ regardless of the expansion / contraction of 3 ₁ , 23 _1, ...
4 ₁ are provided respectively.

The screw shaft 16 ₁ passes through the expander 17 ₁ , and the small-diameter screw portion 21 ₁ of the screw shaft 16 ₁ is screwed into a female screw 26 formed on the inner surface of the collar 25. Moreover, the tip of the screw shaft 16 ₁ , that is, the small-diameter screw portion 21
The _first tip, engaging the expander 17 _1, stopper 27 ₁ to prevent the leaves from the tip of the expander 17 ₁ screw shaft 16 ₁ is fixed in contact. The stopper 27 ₁ is, for example, a cap nut screwed on the tip of the small diameter threaded portion 21 _1, in order to makes it securely stuck to the front end of the screw shaft 16 ₁ of the stopper 27 _1, threaded stopper 27 ₁ The tightening force is set relatively high.

The decreasing mechanism 18 _1, the screw shaft 16 and the pressing portion 20 ₁ provided on the _1, tapered and is pressing portion 20 ₁ of the scaling unit 23 ₁ in the expander 17 ₁ as possible to contact the outer surface , 23 ₁ ... And pressure receiving surfaces 28 ₁ , 28 ₁ ...

Such an expansion / contraction mechanism 18₁According to the first
Pipe 12₁Against the second pipe 12_TwoTurn in the loosening direction
The pressing portion 20 is rotated as shown in FIG.₁Is each pressure receiving surface 2
8₁, 28₁When you try to move away from ...
Face 28₁, 28₁Since there is no pressing force on ...
Reduction part 23₁, 23₁... is in a reduced diameter state and is an expander
17₁And the first pipe 12₁The frictional engagement force generated between
Mainly each lip 24 ₁, 24₁Only by ...
This frictional engagement force is₁With the rotation of
Spanda 17₁It prevents rotation of the
Ip 12_TwoThat is, the screw shaft 16₁Is the first pipe 12₁To
On the other hand, when moving in the axial direction, the expander 17₁of
It is only enough to allow axial sliding operation. Therefore, FIG.
In the state of the first pipe 12₁Second pipe to_Twoof
The relative axial position can be adjusted freely.

Further, as shown in FIG. 2, the first pipe 12 ₁
On the other hand, the second pipe 12 ₂ is rotated in the direction opposite to the loosening direction to move the pressing portion 20 ₁ to the pressure receiving surfaces 28 ₁ , 28.
_When pressed against ₁ ..., the tip end of each expansion / contraction part 23 ₁ , 23 ₁ ... Is expanded so as to be strongly pressed against the inner surface of the first pipe 12 ₁ , and at this time, the expander 17 ₁ and the first pipe 12 ₁ frictional engagement force generated between the becomes strong enough to hold the axial relative position of the expander 17 _1, namely a first pipe 12 ₁ and the second relative axial position of the pipe 12 ₂ with respect to the first pipe 12 ₁ . Therefore, FIG.
In this state, the axial position of the expander 17 ₁ in the first pipe 12 ₁ is adjusted, and thereafter, the expansion / contraction mechanism 18 ₁ causes strong friction between the expander 17 ₁ and the first pipe 12 _{1 as} shown in FIG. By causing the engagement force, the advancing / retreating position of the second pipe 12 _{2 with} respect to the first pipe 12 ₁ is determined.

A mechanism similar to that between the first and second pipes 12 ₁ and 12 ₂ is also provided between the second pipe 12 ₂ and the third pipe 12 ₃ which are fitted so as to be able to extend and contract. The third pipe 12 _{3 with} respect to the second pipe 12 ₂ .
It is possible to freely adjust the advancing / retreating position and to hold the advancing / retreating position. Therefore, walking stick 1
1. The length of the whole 1 can be freely adjusted.

Next, the operation of the first embodiment will be described.
Then expander 17₁Screw shaft 16 penetrating through₁Ahead of
Stopper 27 at the end₁Is fixed to the stopper 2
7₁Expander 17₁Engage and contact the extract
Panda 17₁Screw shaft 16₁To break away from the tip of
It works to prevent. Therefore, the stick 11 is configured.
Each pipe 12₁, 12_Two, 12_ThreeSeparate from each other
Momo expander 17 ₁Is the screw shaft 16₁Can leave
Not, expander 17₁Surely prevent the loss of
be able to.

The large diameter pipe 12₁Or 12_Two
Pipe 12 on the small diameter side_TwoOr 12_ThreeOne
Screw shaft 16 coaxially fixed to the end side₁On the small diameter pie
P 12_TwoOr 12_ThreeThe diameter becomes larger as you go to
Pa-shaped pressing part 20₁Is provided, and the pressing portion 20 is provided.₁And d
Kispanda 17₁A plurality of expansion / contraction parts 23 provided in₁, 2
3₁Pressure receiving surface 28 provided on the inner surface side of₁, 28₁…When
Then, the pressing portion 20₁Each pressure receiving surface 28₁, 28₁Press on ...
Each expansion / contraction part 23 by tightening₁, 23₁Expand the diameter
Expansion / contraction mechanism 18₁Is configured. Therefore,
When using the key 11, the first and second pipes 12₁, 12_Two
Between, and the second and third pipes 12 _Two, 12_ThreeBetween
By the axial compressive force that acts, the expansion / contraction mechanism 18₁Is exhausted
Spanda 17₁And the first pipe 12₁Or the second pipe
12_TwoOperates to strengthen the frictional engagement force generated between
That means each pipe 12₁, 12_Two, 12_ThreeMutual
The relative position in the axial direction is held more firmly.

6 to 8 show a second embodiment of the present invention. FIG. 6 is a sectional view corresponding to FIG. 2 of the first embodiment, and FIG. 7 is a sectional view taken along line 7-7 of FIG. 8 is a cross-sectional view corresponding to FIG. 6 in a state where the expander has a reduced diameter.

A first and a second that are fitted to each other to form a pair.
The second pipe 1 which is the smaller diameter side of the pipes 12 ₁ and 12 _2.
The base end of the screw shaft 16 ₂ is coaxially fixed to one end of 2 ₂ .
An expander 17 ₂ that frictionally engages with the inner surface of the first pipe 12 _{1 on} the large diameter side and that increases the frictional engagement force when expanding the diameter is inserted into the first pipe 12 ₁ so as to be expandable and contractible. _An expansion / contraction mechanism 18 ₂ is provided between ₂ and the screw shaft 16 ₂ .

At one end of the second pipe 12 ₂ , the pipe 1
The plug member 30 ₁ is press-fitted so that the one end opening of 2 ₂ is closed, and the base end of the screw shaft 16 ₂ is screwed into the plug member 30 ₁ . Moreover with threaded clamping force against the plug member 30 ₁ of the screw shaft 16 _2, slack is set so as not to significantly occur by the reaction force acting on the screw shaft 16 _2, whereby the proximal end of the screw shaft 16 ₂ is the second It will be securely fixed to one end of the pipe 12 ₂ .

The expander 17 ₂ is capable of expanding and contracting the distal end side along the radial direction of the base 22 ₂ made of synthetic resin and the first pipe 12 ₁ so that the base end is in the circumferential direction of the base 22 _2. Expandable / contractible parts 23 ₂ , 23 made of synthetic resin, which are integrally provided in series at a plurality of spaced places, for example, 4 places
₂ , and the respective expansion / contraction parts 23 ₂ , 23 ₂ are arranged on the side of the second pipe 12 ₂ and fitted into the first pipe 12 ₁ .
Moreover Each scaling unit 23 _2, 23 ₂ ... tip of, their scaling unit 23 _2, 23 ₂ ... frictional engagement force by elastically sliding contact with the first pipe 12 ₁ of the inner surface regardless scaling of Each of the lips 24 ₂ is provided.

The screw shaft 16 ₂ passes through the expander 17 ₂ coaxially, and an enlarged portion having a hexagonal cross section is integrally provided as a stopper 27 _{2 at} the tip of the screw shaft 16 ₂ .

Expansion / contraction mechanism 18_TwoExpander 17_Twoof
Base 22_TwoIn the hexagonal locking hole 31 provided coaxially in
Hexagonal engaging part 32a that engages is provided at one end
Axis 16_TwoScrew together with the second pipe 12_TwoBeside
Tapered pressing portion 20 having a smaller diameter as it faces_TwoThe other end
32 and the pressing portion 20_TwoAbut the outer surface of
Each expansion / contraction unit 23 that enables_Two, 23_TwoOn the inner side of
Pressure receiving surface 28 provided _Two, 28_TwoAnd a plug member 3
0₁And expander 17_TwoThe washer 33 is in between
Expander 17_TwoAnd stopper 27_TwoWashes in between
34 are respectively interposed.

According to this second embodiment, the first pipe 12
₁Against the second pipe 12_TwoRotate in the loosening direction,
As shown in FIG. 8, the pressing portion 20_TwoIs each pressure receiving surface 28_Two, 28
_TwoWhen separated from the pressure receiving surface 28_Two,
28_TwoSince the pressing force does not act on the ...
3_Two, 23_Two... is in a reduced diameter state and expander 17_Two
And the first pipe 12₁The frictional engagement force generated between
Each lip 24_Two, 24_TwoIt ’s only due to…
The frictional engagement force of the screw shaft 16_TwoExpand with the rotation of
Da 17_TwoThe second pipe 1 is prevented from rotating.
2_TwoThat is, the screw shaft 16_TwoIs the first pipe 12₁Against
Expander 17 when moving in the axial direction _TwoAxial direction
It is a degree that allows sliding operation. Therefore, the state of FIG.
And the first pipe 12₁Second pipe to_TwoAxial direction
The relative position can be adjusted freely.

From the state shown in FIG. 8, the first pipe 12₁To
And then the second pipe 12_TwoTurn in the direction opposite to the loosening direction
When the rolling operation is performed, the first pipe 12₁Substantially fixed against
Expander 17 in position_TwoNut 3 in the locking hole 31 of
Since the two are engaged, the second pipe 12_TwoIs exhausted
Spanda 17_TwoMove closer to. And wow
Sha 33 is expander 17_TwoEven if it touches the
Ip 12_TwoIf you continue the rotating operation of_TwoIs d
Kispanda 17_TwoWas prevented from moving axially relative to
It will rotate in this state, and as shown in FIG.
The pressing part 20_TwoEach reduced diameter portion 23_Two, 23_Two
Pressure receiving surface 28_Two, 28_TwoMove in the direction of pressing against
You. Thereby, each expansion / contraction unit 23_Two, 23_TwoThe tip of ...
First pipe 12₁Expanded so that it can be pressed strongly against the inner surface of
Expander 17_TwoAnd the first pipe 12₁In between
The generated frictional engagement force is the first pipe 12₁Extract against
Panda 17_TwoRelative position in the axial direction of the first pipe 1
2₁And the second pipe 12_TwoHolds the relative position in the axial direction of
It will be strong enough. Therefore, in the state of FIG.
Spanda 17_TwoFirst pipe 12₁The axial position within
Adjustment, and then the expansion / contraction mechanism 18 as shown in FIG._TwoBy
Expander 17_TwoAnd the first pipe 12 ₁In between
A strong frictional engagement force is generated so that the first piston
P 12₁Second pipe to_TwoThe advancing / retreating position of
Will be.

[0029] Moreover stopper 27 ₂ provided at the tip of the screw shaft 16 ₂ passing through the expander 17 _2, engages the expander 17 _2, the abutting washer 34 abuts expander 17 ₂ screw shaft 16 _It works to prevent the ₂ from tipping off. Therefore expander 1
7 ₂ does not separate from the screw shaft 16 ₁ and the expander 17 ₂ can be reliably prevented from being lost.

9 and 10 show a third embodiment of the present invention. FIG. 9 is a sectional view corresponding to FIG. 6 of the second embodiment, and FIG. 10 is a view showing the expander in a reduced diameter state. It is sectional drawing corresponding to.

This third embodiment is similar to the second embodiment described above.
The second pipe 12 _TwoThe base end is fixed to
Expander 17_TwoScrew shaft 16 penetrating through_TwoAt the tip of
Is the screw shaft 16_TwoIt is a cap nut screwed to the tip of
Stopper 27_ThreeHowever, the screw tightening force is set to be relatively large.
It is fixed by doing. Moreover, the stopper 27_ThreeTo
Expander 17_TwoEngage and abut the expander
Da 17_TwoScrew shaft 16_TwoPrevents separation from the tip of the
A brim portion 27a for doing so is integrally provided. For this reason,
The washer 34 required in the second embodiment is unnecessary.
Therefore, the number of parts can be reduced.

FIGS. 11 and 12 show a fourth embodiment of the present invention. FIG. 11 is a sectional view corresponding to FIG. 9 of the third embodiment, and FIG. 12 is a view in which the expander has a reduced diameter. It is sectional drawing corresponding to.

First and second members fitted to each other to form a pair
The second pipe 1 which is the smaller diameter side of the pipes 12 ₁ and 12 _2.
The base end of the screw shaft 16 ₃ is coaxially fixed to one end of 2 ₂ .
An expander 17 ₃ which frictionally engages with the inner surface of the first pipe 12 _{1 on} the large diameter side and strengthens the frictional engagement force at the time of expanding the diameter is inserted into the first pipe 12 ₁ so as to be expandable and contractible. _An expansion / contraction mechanism 18 ₃ is provided between ₃ and the screw shaft 16 ₃ .

At one end of the second pipe 12 ₂ , the pipe 1
The plug member 30 ₂ is press-fitted so that the one end opening of 2 ₂ is closed, and the base end of the screw shaft 16 ₃ is screwed into the plug member 30 ₂ . The screw shaft 16 ₃ is coaxially and integrally provided at the distal end of the threaded portion 35 on the proximal end side thereof with a pressing portion 20 ₃ formed in a tapered shape having a smaller diameter toward the second pipe 12 ₂ side. The distal end surface of the pressing portion 20 ₃ is for engaging a wrench or the like when the base end portion of the screw shaft 16 _{3 or} the base end of the screw portion 35 is screwed onto the plug member 30 ₂ . A locking projection 36 having a hexagonal cross section is provided so as to project. Thus was with screwed clamping force against the plug member 30 ₂ of the screw shaft 16 ₃ is loosened is set large so as not to cause reaction force acting on the screw shaft 16 _3, whereby the base end of the screw shaft 16 ₃ It will be securely fixed to one end of the second pipe 12 ₂ .

The expander 17 ₃ is capable of expanding and contracting the distal end side along the radial direction of the first pipe 12 ₁ and the base portion 22 ₃ made of synthetic resin, and the proximal end is in the circumferential direction of the base portion 22 _3. Expandable / contractible parts 23 ₃ and 23 made of synthetic resin that are integrally connected to a plurality of spaced places, for example, 4 places.
₃ and a collar 25 which is formed of a metal in a cylindrical shape and is integrally embedded in the base portion 22 ₃ , and each expansion / contraction portion 23 ₃ ,
23 ₃ is arranged on the side opposite to the second pipe 12 ₂
It is fitted in the pipe 12 ₁ . Moreover, each expansion / contraction unit 23 ₃ ,
23 ₃ ... to the tip of their scaling unit 23 _3, 23 ₃
Regardless of the expansion / contraction of each of the lips, a lip 24 ₃ that elastically comes into sliding contact with the inner surface of the first pipe 12 ₁ to exert a frictional engagement force is provided. That is, this expander 17 ₃ has basically the same configuration as the expander 17 ₁ of the first embodiment shown in FIGS. 2 to 5, but the first pipe 12 is oriented in the opposite direction to the expander 17 _1. It is inserted in ₁ . The screw shaft 16 ₃ passes through the expander 17 ₃ , and the screw portion 35 of the screw shaft 16 ₃ is screwed into a female screw 26 formed on the inner surface of the collar 25.

The scaling mechanism 18 _3, the screw shaft and the pressing portion 20 ₃ provided in the 16 _3, the pressing portion 20 ₃ of the scaling unit 23 in the expander 17 ₃ as possible to contact the outer surface ₃ is tapered , 23 ₃ ... And pressure receiving surfaces 28 ₃ , 28 ₃ ...

According to the expansion / contraction mechanism 18 ₃ , the second pipe 12 ₂ is rotated in the loosening direction with respect to the first pipe 12 ₁ , and the pressing portion 20 ₃ causes the pressure receiving surface 28 to move as shown in FIG.
_3, 28 ₃ ... when so away from resides in the scaling unit 23 _3, 23 ₃ ... are contracted state since the pressure-receiving surface 28 _3, 28 ₃ ... pressing force is not applied, the expander 1
7 ₃ and the first pipe 12 ₁ generate frictional engagement force mainly due to the lips 24 ₃ , 24 ₃ ... And this frictional engagement force causes the expander 17 ₃ to rotate with the rotation of the screw shaft 16 _3. It is prevented from operating, but only allows the expander 17 ₃ to slide in the axial direction when the second pipe 12 _2, that is, the screw shaft 16 ₃ moves axially with respect to the first pipe 12 ₁ . Therefore, FIG.
In the state of 2, the second pipe 12 _{2 with} respect to the first pipe 12 ₁
It is possible to freely adjust the relative axial position of the.

Further, as shown in FIG. 11, the first pipe 12
_With respect to ₁ , the second pipe 12 ₂ is rotated in the direction opposite to the loosening direction to move the pressing portion 20 ₃ to the pressure receiving surfaces 28 ₃ and 2 2.
8 ₃ when pressed ..., each scaling unit 23 _3, 23 ₃ ... of the tip portion is expanded to be strongly pressed against the first pipe 12 ₁ of the inner surface, the expander 17 ₃ and the first pipe 12 in this case _The frictional engagement force generated between the first and second pipes 12 ₁
Relative to the expander 17 _{3 in} the axial direction, that is, the axial relative positions of the first pipe 12 ₁ and the second pipe 12 ₂ are retained. Thus by adjusting the axial position of at expander 17 ₃ first pipe 12 within ₁ in the state of FIG. 12, then, expander 17 ₃ and the first by decreasing mechanism 18 ₃ as shown in FIG. 11
Strong frictional engagement force between the pipe 12 ₁ by such occurs, first second pipe to pipe 12 ₁ 12 ₂
The advancing / retreating position of will be determined.

According to the fourth embodiment, the pressing portion 20 ₃ provided on the screw shaft 16 ₃ not only functions as a component of the expansion / contraction mechanism 18 ₃ , but also the pressure receiving surface 28 _{3 of the} expander 17 _1. , by contacting engagement 28 ₃ ..., which also performs the function as a stopper for preventing the detached from the distal end of the expander 17 ₃ screw shaft 16 _3, it is possible to reduce the number of parts Becomes

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, the present invention can be widely applied to not only a walking stick but also a long object such as a stock whose length can be expanded and contracted and a camera support leg, and the number of pipes constituting the long object is three. It is not limited to books.

Colors in the first and fourth embodiments
25 is omitted, and the screw shaft 16₁, 16 _ThreeTo expander
They may be screwed directly together, and each expander 17₁
~ 17_Three24 provided on the₁~ 24_ThreeOmit
And those expanders 17₁~ 17_ThreeScaling
Part 23₁~ 23_ThreeExpander with self-expanding power of 17₁~
17_ThreeMay be brought into frictional contact with the inner surface of the pipe.
Yes.

[0043]

As described above, according to the invention described in claim 1, since the stopper for preventing the expander from separating from the tip of the screw shaft is provided at the tip of the screw shaft which penetrates the expander. , Even if each pipe is separated from each other, the expander will be held securely on the screw shaft,
It is possible to reliably prevent the expander from being lost.

According to a second aspect of the invention, in addition to the constitution of the first aspect of the invention, the expander includes a cylindrical base portion to which a screw shaft is screwed and a pipe on the large diameter side. The expansion / reduction mechanism is provided with a expansion / contraction part in which the base end is integrally connected to a plurality of places spaced apart in the circumferential direction of the base to enable expansion / contraction operation in the radial direction. A pressing portion that has a tapered outer surface that becomes larger in diameter toward the pipe and that is integrally provided on the screw shaft, and a pressure receiving member that is capable of contacting the outer surface of the pressing portion and that is provided on the inner surface side of each expansion / reduction portion. Since it is configured with a surface, a load in the direction of pressing the pressing portion against the pressure receiving surface is applied to the expansion and contraction mechanism when the load is applied in the direction of reducing the long object,
It is possible to strengthen the frictional engagement force of the expander with respect to the large-diameter side pipe and reliably maintain the position of the expander.

Further, according to the invention of claim 3, in addition to the constitution of the invention of claim 1, the expander comprises:
It is possible to expand and contract the tip side along the radial direction of the large-diameter pipe with the cylindrical base to which the screw shaft is screwed, and the space in the circumferential direction of the base on the side opposite to the small-diameter pipe. The expansion and contraction section has a base end integrally connected to a plurality of open spaces, and the expansion and contraction mechanism has a tapered outer surface that becomes smaller in diameter toward the small diameter side pipe and is integrated with the tip of the screw shaft. The pressing portion also serving as a stopper and the pressure receiving surface provided on the inner surface at the tip end side of each expansion / contraction portion so as to be able to contact the outer surface of the pressing portion. Can be prevented from coming off the screw shaft.

[Brief description of drawings]

FIG. 1 is a side view of a walking stick according to a first embodiment in an extended state.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is an enlarged perspective view of a main part of FIG.

5 is a cross-sectional view corresponding to FIG. 2 in a state where the expander has a reduced diameter.

FIG. 6 is a sectional view corresponding to FIG. 2 of the second embodiment.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a cross-sectional view corresponding to FIG. 6 in a state where the expander has a reduced diameter.

9 is a sectional view of a third embodiment corresponding to FIG.

FIG. 10 is a sectional view corresponding to FIG. 9 in a state where the expander has a reduced diameter.

FIG. 11 is a sectional view corresponding to FIG. 9 of the fourth embodiment.

FIG. 12 is a sectional view corresponding to FIG. 11 in a state where the expander has a reduced diameter.

[Explanation of symbols]

11 ... Walking sticks 12 ₁ , 12 ₂ , 12 ₃ ... Pipes 16 ₁ , 16 ₂ , 16 ₃ ... Screw shafts 17 ₁ , 17 ₂ , 17 ₃ ... Expanders 18 ₁ , 18 _2, 18 ₃ ... decreasing mechanism 20 _1, 20 ₃ ... pressing portion 22 _1, 22 ₃ ... base 23 _1, 23 _3, ... scaling unit 27 _1, 27 _2, 27 ₃ ...・ Stoppers 28 ₁ , 28 ₃ ... Pressure receiving surface

Claims (3)

[Claims] 1. A small-diameter pipe (12 ₂ , 12 ₃ ) of large and small pipes (12 ₁ , 12 ₂ ; 12 ₂ , 12 ₃ ) which are fitted to each other so as to be expandable and contractable, and has a screw at one end thereof. Axis (1
The base ends of 6 ₁ , 16 ₂ and 16 ₃ are coaxially fixed, and expander (which expands the frictional engagement force during diameter expansion while frictionally engaging with the inner surface of the large diameter pipe (12 ₁ , 12 ₂ ). 17 ₁ , 17 ₂ , 17 ₃ ) are formed to be expandable and contractable and inserted into the large diameter pipes (12 ₁ , 12 ₂ ), and the expanders (17 ₁ , 17 ₂ , 17 ₃ ) and the screw shaft Between the pipes (16 ₁ , 16 ₂ , 16 ₃ ) and the pipes ( _{1 1} , 12 ₂ ) on the large diameter side, the pipes (1
2 _2, 12 the expander (17 ₁ in response to rotation of _3), 17 _2, 17 ₃₎ the scaling allowed to decreasing mechanism (18 _1, 18 _2, 18 ₃₎ are provided, stretchable adjustable elongated Expanders (17 ₁ , 17 ₂ ,
17 ₃ ) threaded screw shaft (16 ₁ , 16 ₂ , 16 ₃ )
At the tip of the expander (17 ₁ , 17 ₂ , 17 ₃ )
The stoppers (27 ₁ , 27 ₂ , 27 ₃ , which prevent the screw shafts (16 ₁ , 16 ₂ , 16 ₃ ) from coming off from the tips.
20 ₃ ) is provided, which is a long object which is adjustable in expansion and contraction. 2. An expander (17)₁) Is the screw shaft (1
6₁) Are screwed together to form a cylindrical base (22₁) And the large diameter side
Pipe of (12₁, 12_Two) Tip side along the radial direction
The base portion (2
2₁) The base ends are integrated at multiple locations spaced in the circumferential direction.
Expansion / contraction part (23₁) And the expansion / contraction mechanism (18
₁) Is the small diameter pipe (12_Two, 12_Three)
Has a tapered outer surface with a large diameter
6₁) And a pressing part (20 ₁) And the press
Department (20₁) It is possible to contact the outer surface of each
Division (23 ₁), Pressure receiving surfaces (2
8₁) And, are formed.
A long object that can be adjusted for expansion and contraction. 3. An expander (17)_Three) Is the screw shaft (1
6_Three) Are screwed together to form a cylindrical base (22_Three) And the large diameter side
Pipe of (12₁, 12_Two) Tip side along the radial direction
The pipe on the small diameter side can be expanded and contracted.
(12_Two, 12 _Three) And the base (22_Three)of
The base end is integrally connected to multiple places spaced in the circumferential direction.
Expansion / contraction part (23_Three) And the expansion / contraction mechanism (18_Three)
Small diameter pipe (12_Two, 12_Three) Smaller diameter toward
With a tapered outer surface_Three) Tip
The stopper pressing portion (20_Three)
And the pressing portion (20_Three) It is possible to contact the outer surface of
Each expansion / contraction part (23_Three) On the inner surface of the tip side of
Pressure receiving surface (28_Three) And
The elongated object according to claim 1, which is adjustable in expansion and contraction.