JP3294993B2 - Telescopic cylinder structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic tubular structure applied to a clothesline, a survey pole, and the like.

[0002]

2. Description of the Related Art Conventionally, a telescopic cylinder structure has, for example, as shown in FIG. 7 , an outer cylinder a and an inner cylinder b which is slidably and fixedly inserted into the outer cylinder a. A shaft e having a flange c is provided at one end of the inner cylinder b.
The axis L ₂ of the axis L ₁ and the shaft portion e of the inner cylinder b and set to the shift relationship position, between the flange portion c and the inner cylinder b, loosely fitted rubber piece g.

Next, a method of attaching the inner cylinder b to the outer cylinder a will be described. First, as shown in (b) of FIG. 7, interpolating fitting the inner cylinder b to the outer cylinder a as indicated by the arrow A. Then, when twisting the inner cylinder b and the outer cylinder a simultaneously to different respective directions, in FIG. 7 (b)
The state shown in FIG. That is, the rubber piece g enters a narrow gap formed by the shaft e of the inner cylinder b and the outer cylinder a as shown by the arrow B. For this reason, the inner cylinder b can be fixed to the outer cylinder a.

[0004]

However, as shown in FIG. 7 (c), if the inner cylinder b is fixed in a stretched state with respect to the outer cylinder a, the elastic force of the rubber piece g causes the outer cylinder b to rebound. the bent direction of the force on the cylinder a and the inner cylinder b acts, the axis L ₁ and the axis L ₃ of the outer tube a of the inner cylinder b is not disposed on the same straight line,
Makes a slight angle θ. Therefore, for example, when trying to measure the distance using a surveying pole to which the telescopic cylinder structure is applied, it has been difficult to measure accurately.

Accordingly, the present invention solves the above-mentioned problems, and also allows the inner cylinder to be securely and firmly fixed to the outer cylinder at a desired position. It is an object of the present invention to provide a telescopic tubular body structure that always matches.

[0006]

One telescopic cylinder structure according to the present invention comprises an outer cylinder and an inner cylinder, and the outer cylinder and the inner cylinder are freely slidable in the axial direction and rotatable about the axis. Is possible,
Together with the nut member inside said outer tube is fitted as freely axial sliding bolt member to one end of the inner cylinder is fixed, the nut member includes a disk portion having a threaded hole, into the screw hole A cylindrical portion having a hole portion that is communicatively connected , wherein the cylindrical portion has a maximum outer diameter in a free state within the outer cylinder.
An outer peripheral pressure contact surface portion that is slightly larger than the diameter, the bolt member includes a shaft portion, and a screw shaft portion provided on the shaft portion; By screwing into the screw hole of the member, the shaft portion of the bolt member presses the inner peripheral surface of the hole portion of the nut member, and the outer peripheral pressure contact surface portion of the nut member expands and the outer cylinder Is configured to be in pressure contact with the inner peripheral surface.

Further, another telescopic cylinder structure has an outer cylinder provided with a mirror at its upper end for collimating with a lightwave measuring theodolite, a thread inside, and a cone fixed to the lower end of the thread. And an inner cylinder having a shaped weight, wherein the outer cylinder and the inner cylinder are mutually slidable in the axial direction and rotatable around the axis, and a nut member is slid in the axial direction inside the outer cylinder. together are fitted as freely, the bolt member is fixed to the upper end of the inner cylinder, the nut member includes a disk portion having a threaded hole, the
A cylindrical portion having a hole portion connected to the screw hole ,
The outer diameter of the cylindrical portion in the free state is larger than the inner diameter of the outer cylinder.
An outer peripheral pressure contact surface portion that is slightly enlarged, the bolt member includes a shaft portion, and a screw shaft portion provided on the shaft portion,
By screwing the screw shaft of the bolt member into the screw hole of the nut member, the shaft of the bolt member is
The inner peripheral surface of the hole of the nut member is pressed, and the outer peripheral pressure contact surface portion of the nut member is expanded so as to press against the inner peripheral surface of the outer cylinder.

[0008] A cut-out portion is formed in the cylindrical portion of the nut member to allow the nut member to expand in diameter.
You.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a telescopic cylinder structure according to the present invention, which is a telescopic pole (pipe) such as a clothesline.
The inner cylinder 2 includes an outer cylinder 1 and an inner cylinder 2, and has an annular rattling preventing member 18 for preventing rattling of the inner cylinder 2.

The outer cylinder 1 and the inner cylinder 2 are mutually slidable in the direction of the axis L and rotatable around the axis L. Note that the axis L refers to an axis in a state where the inner cylinder 2 is attached to the outer cylinder 1. That is, both axes of the outer cylinder 1 and the inner cylinder 2 coincide.

A nut member 3 is fitted into the outer cylinder 1 so as to be slidable in the axial center L direction.
Specifically, the nut member 3 includes a disk portion 29 having a screw hole 4 and a cylindrical portion 30 having a hole portion 5 which is connected to the screw hole 4. The outer peripheral wall of the cylindrical portion 30 is , The outer cylinder 1
The outer peripheral pressure contact surface portion 6 is in contact with (presses against) the inner peripheral surface of the outer peripheral surface.

Further, a bolt member 7 is attached to one end (opening) of the inner cylinder 2. As shown in FIG. 2, the bolt member 7 includes a mounting portion 8 mounted on one end (opening) of the inner cylinder 2 and a shaft portion 9 connected to the mounting portion 8.
And a screw shaft portion 10 provided on the shaft portion 9.

The mounting portion 8 (of the bolt member 7)
It comprises an insertion shaft 11 and an outer flange 12 provided on the insertion shaft 11. That is, the insertion shaft portion 11 of the mounting portion 8 is
When the bolt member 7 is inserted into one end of the mounting member 8 until the outer flange portion 12 (of the mounting portion 8) abuts, the bolt member 7 is fixed to the inner cylinder 2.

The shaft portion 9 (of the bolt member 7) includes a shaft portion main body 13, and a tapered surface portion 14 provided continuously with the shaft portion main body 13 and having a diameter gradually reduced toward the nut member 3. . Furthermore, the relationship between the outer diameter d ₂ of the hole 5 of the outer diameter d ₃ and the nut member 3 of the shaft body 13 of the shank 9 is a d _3> d ₂ At a free state (see FIG. 1 ). The taper angle of the tapered surface portion 14 is more preferably an acute angle. This is because the bolt member 7 is easily guided to the nut member 3.

Then, as shown in FIG.
A detachment preventing member 15 is connected to the screw shaft portion 10.
Specifically, the detachment preventing member 15 includes a shaft 16 attached to the screw shaft 10 and an outer flange 17 provided on the shaft 16.
And consisting of

Furthermore, the relationship between the outer diameter d ₅ and the inner diameter d ₄ of the screw hole 4 of the nut member 3 of the shaft portion 16, the d ₅ towards the d ₄
Bigger than. The relationship between the outer diameter d ₁ of the outer flange 17 of the stopper member 15 and the inner diameter d ₄ of the screw hole 4 is such that d ₁ is smaller than d ₁ so that the nut member 3 does not come out of the stopper member 15. Larger than _four .

Therefore, when the bolt member 7 is inserted into the hole 5 of the nut member 3, the shaft 16
Can be inserted into the screw hole 4 of the nut member 3, and the shaft portion 16 can be attached to the screw shaft portion 10 of the bolt member 7. At this time, the inner cylinder 2 and the nut member 3 are integrated.

Next, a method of using a telescopic pole (pipe) such as a clothesline to which the telescopic cylinder structure is applied will be described. First, the inner cylinder 2 integrated with the nut member 3 as described above is inserted into the outer cylinder 1 as shown in FIG. 1A, and in this state, the inner cylinder 2 is The outer cylinder 1 is slid in the direction of the axis L as shown by the arrow C to the desired mounting position (at this time, the nut member 3 is also slid in the direction of the axis L as shown by the arrow C). The outer cylinder 1
May be slid in the direction of the axis L with respect to the inner cylinder 2 to a desired position, or the outer cylinder 1 and the inner cylinder 2 may be slid in the direction of the axis L with respect to each other.

Next, by pushing up the inner cylinder 2 with respect to the outer cylinder 1 and rotating it about the axis L as shown by the arrow E, the bolt member 7
The shaft body 13 of the shaft 9 (of the bolt member 7) is smoothly inserted into the hole 5 of the nut member 3 at the tapered surface portion 14 of the nut member 3, and the tip of the screw shaft portion 10 of the bolt member 7 is It is screwed into the screw hole 4 of the member 3. It is also preferable that the screw shaft portion 10 of the bolt member 7 is slightly screwed into the screw hole 4 of the nut member 3 in advance, and the inner cylinder 2 is rotated around the axis L with respect to the outer cylinder 1.

When the inner cylinder 2 is further rotated around the axis L as indicated by an arrow E, the bolt member 7 is screwed into the nut member 3 so that the shaft body 13 of the bolt member 7 It comes into contact with the inner peripheral surface of the member 3 forming the hole 5.
At this time, since there is a relationship of d ₃ > d ₂ between the outer diameter d ₃ of the shaft main body 13 of the shaft 9 and the outer diameter d ₂ of the hole 5 of the nut member 3, FIG. As shown in (b), the outer peripheral pressure contact surface portion 6 of the nut member 3 expands, and an arrow F is formed on the inner peripheral surface of the outer cylinder 1.
Press in as shown.

That is, the nut member 3 is firmly fixed inside the outer cylinder 1 by the pressing force of the outer peripheral pressure contact surface portion 6 on the inner peripheral surface of the outer cylinder 1. Therefore, the inner cylinder 2 and the outer cylinder 1 are integrated.

When the fixing position of the inner cylinder 2 is changed, for example, the rattling preventing member 18 is first removed and the inner cylinder 2 is fixed.
Is rotated in the direction opposite to the arrow E, that is, in the direction of the arrow G, to release the screwed state of the screw shaft portion 10 (of the bolt member 7) into the screw hole 4 (of the nut member 3). That is, the bolt member 7 is separated from the nut member 3.

Next, the inner cylinder 2 may be slid with respect to the outer cylinder 1 as shown by an arrow C. At this time, the nut member 3 comes into contact with the outer flange portion 17 of the stopper member 15, so that the nut member 3 moves integrally with the inner cylinder 2 inside the outer cylinder 1.

Therefore, it is not necessary to confirm where the nut member 3 is located inside the outer cylinder 1, and the bolt member 7 can be reliably and smoothly screwed into the nut member 3 again. Then, as described above, the inner cylinder 2 may be attached to the outer cylinder 1 at a desired position.

FIG. 3 shows another embodiment of the present invention. In this case, the nut member 3 includes a disc portion 41 having a screw hole 40,
A cylindrical (shaped) portion 42 having an outer peripheral pressure contact surface portion 6 that sequentially expands toward the bolt member 7; The cylindrical portion 42 has a hole 43 having a large-diameter portion 43a, a tapered portion 43b, and a small-diameter portion 43c. parts 44 and 44 are formed. The notch 44 includes an axial portion 44a, and a triangular portion 44b which is communicatively connected to the axial direction portion 44a, consisting of. Further, a pair of notches 45, 45 in the radial direction are formed between the disk portion 41 and the cylindrical portion 42, as shown in FIG. Note that the notch 45, 45 is approximately 90 ° in the circumferential direction with respect to the notch 44, 44
It is off.

That is, in the nut member 3, in the free state, the outer peripheral pressure contact surface portion 6 is in an expanded state, and in this state, the maximum outer diameter of the outer peripheral pressure contact surface portion 6 is slightly larger than the inner diameter of the outer cylinder 1. You. Further, when the cylindrical portion 42 is pressed in the inner diameter direction, the diameter decreases, and when the pressing force is released, the cylindrical portion 42 returns to the original state. That is, as the nut member 3, plastic or metal having high elasticity is used.

Accordingly, when the nut member 3 is inserted into the outer cylinder 1, the notch portions 44, 44 and the notch portions 45, 45 allow the cylinder portion 42 to have a slightly reduced diameter, and the outer peripheral pressure contact surface portion. 6 comes into pressure contact with the inner peripheral surface of the outer cylinder 1 with a slight force.

The bolt member 7 fixed to the inner cylinder 2
Is the same as that shown in FIGS. 1 and 2 and usually
As shown in (a) of FIG.
In the screw hole 4 slightly shorter. In this case, the neck portion 46 of the screw shaft portion 10, the tapered surface portion 14, and the shaft portion main body 13 do not contact the inner peripheral surface of the hole portion 43 of the nut member 3.

From this state, the inner cylinder 2 is rotated with respect to the outer cylinder 1 so that the screw shaft portion 10 of the bolt member 7 is screwed into the screw hole 40 of the nut member 3 (the stroke of this screwing is Then, as shown in FIG. 3B, the tapered surface portion 14 of the bolt member 7 comes into pressure contact with the tapered portion 43b of the nut member 3, and the cylindrical portion 42 of the nut member 3 will expand. And As a result, a pressing force acts on the inner peripheral surface of the outer cylinder 1 of the outer peripheral pressure contact surface portion 6, the nut member 3 is firmly fixed inside the outer cylinder 1, and the inner cylinder 2 and the outer cylinder 1 are integrated. Become.

Conversely, if the screw shaft 10 of the bolt member 7 is screwed back into the screw hole 40 of the nut member 3 from the state shown in FIG. The pressing force on the inner peripheral surface of is released, and the state returns to the state shown in FIG.
The nut member 3, the bolt member 7, and the inner cylinder 2 can reciprocate integrally along the axis L (only a short stroke). Therefore, the axial position of the inner cylinder 2 with respect to the outer cylinder 1 can be arbitrarily set, and again at a desired position.
By screwing the screw shaft portion 10 of the bolt member 7 into the screw hole 40 of the nut member 3, the outer cylinder 1 and the inner cylinder 2 can be integrated. That is, also in this case, the length dimension of the telescopic tubular structure can be easily adjusted. And
Since the nut member 3 is made of a material having elasticity, the bolt member 7 is unexpectedly moved by the screw advance / retreat.
1 can be omitted, and the slip-off preventing member 15 of FIG. 1 can be omitted .

[0032] In its as another embodiment, as shown in FIG. 5, telescopic cylinder construction, outer cylinder 1 mirror 19 for collimating light wave distance measuring theodolite to the upper end portion is provided And inner cylinder 2
And an annular rattling preventing member 18 for preventing rattling of the inner cylinder 2.

As described above, the outer cylinder 1 and the inner cylinder 2 are slidable relative to each other and rotatable about the axis L. This telescopic cylinder structure is applied to a survey pole.

Further, a nut member 3 is fitted inside the outer cylinder 1 so as to be slidable in the axial center L direction. And
A bolt member 7 having an insertion hole 26 therein is fixed to the upper end of the inner cylinder 2, and a stone projection 25 is attached to the lower end. Further, a partition wall portion 20 is fitted inside the inner cylinder 2 so as to be orthogonal to the axis L.

A through hole 21 is provided at the center of the partition wall 20. In addition, the partition wall 20
A thread 22 is inserted through the through hole 21. A fixing member 27 inserted and held in an insertion hole 26 of the bolt member 7 is attached to an upper end of the thread 22, and a conical weight 23 is attached to a lower end of the thread 22. Has been attached.

Further, a viewing hole 24 is formed on the outer peripheral wall of the inner cylinder 2 so that the state of insertion of the thread 22 through the through hole 21 of the partition wall portion 20 can be confirmed. Further, the bolt member 7 is provided with a detachment prevention member 15. Specifically, the shaft portion 16 of the stopper member 15 is inserted into the insertion hole 26 of the bolt member 7.
Inserted and held.

Next, a method of using the surveying pole to which the telescopic cylinder structure is applied will be described. The surveying pole is used together with a lightwave distance measuring theodolite to perform surveying in an urban area or the like.

First, the inner cylinder 2 integrated with the nut member 3 is inserted into the outer cylinder 1 as shown in the figure. Pierce the state. Thereafter, the inner cylinder 2 is slid in the direction of the axis L with respect to the outer cylinder 1 as shown by an arrow C so that the mirror 19 of the surveying pole can be collimated to a desired position, that is, by the lightwave distance measuring theodolite. (At this time, nut member 3
Also slides in the direction of the axis L as indicated by the arrow C).

However, whether or not the surveying pole has been pierced vertically must be checked through the viewing hole 24 of the inner cylinder 2 to check the insertion state of the thread 22. That is, the partition wall portion in which the thread 22 is fitted inside the inner cylinder 2
If it is located in the center of the through hole 21 of 20, the surveying pole is pierced vertically, and if the thread 22 is not located in the center of the through hole 21, the surveying pole is pierced vertically. Means no.

Next, by pushing up the inner cylinder 2 with respect to the outer cylinder 1 and rotating it about the axis L as shown by the arrow E, the bolt member 7
Of the shaft portion 9 of the bolt member 7 at the tapered surface portion 14
13 is smoothly inserted into the hole 5 of the nut member 3, and the tip of the screw shaft 10 of the bolt member 7 is
Screw holes 4.

Thereafter, when the inner cylinder 2 is further rotated around the axis L as indicated by an arrow E, the outer peripheral pressure contact surface portion 6 of the nut member 3 is expanded by the screw member 7 being screwed into the nut member 3. It is opened and pressed against the inner peripheral surface of the outer cylinder 1 as shown by an arrow F (see (b) in FIG. 1). For this reason, the nut member 3 is firmly fixed inside the outer cylinder 1 by the pressing force of the outer peripheral pressure contact surface portion 6 on the inner peripheral surface of the outer cylinder 1, so that the inner cylinder 2 and the outer cylinder 1 are integrated. State.

Then, as described above, the inner cylinder 2 and the outer cylinder 1 are firmly fixed, and the mirror 19 of the surveying pole pierced vertically is collimated with the light wave of the lightwave distance measuring theodolite. If the phase difference of the light wave reflected from the object is converted into a distance, an accurate distance measurement result can be obtained .

Further, the nut member 3 shown in FIGS.
The cylindrical portion 30, as shown in FIG. 6, that form a notch 28 for allowing the enlarged diameter of the nut member 3. In this case, the number of the notch portions 28 may be one, but as shown in FIG. 6A, two notches 28 are provided symmetrically with respect to the axis (of the nut member 3). As shown in FIG. 6 (b), four notches 28 may be provided at a 90 ° pitch,
The number is not limited to these.

The nut member 3 shown in FIG. 3 and FIG.
You may use for the survey pole shown in FIG .

[0045]

【The invention's effect】 The present invention has the following features by the above-described configuration.
It has a great effect.

(According to claim 1) the inner cylinder 2 is connected to the outer cylinder 1
When mounted, the axes of the inner cylinder 2 and outer cylinder 1
I have. Therefore, for example, the telescopic tubular structure of the present invention is
If it is applied to a pole, this pole can be used safely as a pole holder.
The laundry can be placed on a
Can be reliably held at the predetermined position.

Further , the inner cylinder 2 and the nut member 3
The inner cylinder 2 is placed at the outer cylinder 1
It can be easily adapted to a desired mounting position.

[0048] In its, the inner cylinder 2 if the bolt member 7 secured to one end portion brought into screwed in the nut member 3, the outer tube 1 the outer peripheral pressing surface 6 of the nut member 3 has been expanded Since the inner cylinder 2 is pressed against the inner peripheral surface, the inner cylinder 2 can be securely and firmly fixed to the outer cylinder 1 at the mounting position.

When the inner cylinder 2 is mounted on the outer cylinder 1 (according to claim 2), the axes of the inner cylinder 2 and the outer cylinder 1 are surely coincident with each other. For this reason, for example, if a surveying pole and a lightwave distance measuring theodolite to which the telescopic cylinder structure of the present invention is applied are used for surveying an urban area or the like, the surveying pole always keeps a straight line state accurately and extremely. The distance can be measured accurately.

Further, since the outer cylinder 1 is slidable in the direction of the axis L with respect to the inner cylinder 2, the mirror 19 (provided at the upper end of the outer cylinder 1) receives light from the lightwave distance measuring theodolite. Can be freely adjusted.

When the bolt member 7 fixed to one end of the inner cylinder 2 is screwed into the nut member 3, the outer peripheral pressure contact surface 6 of the nut member 3 expands, and the inner circumference of the outer cylinder 1 is expanded. Since the inner cylinder 2 is pressed against the surface, the inner cylinder 2 can be securely and firmly fixed to the outer cylinder 1.

(According to claims 1 and 2 ) Nut member 3
Notches 28 and 44 are formed in the cylindrical portions 30 and 42, so that if the bolt member 7 is screwed into the nut member 3,
The outer peripheral pressure contact surface portion 6 of the nut member 3 is easily expanded in diameter. Therefore, the force for screwing the bolt member 7 is small, and the inner cylinder 2 can be more quickly and firmly fixed to the outer cylinder 1.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a bolt member.

FIG. 3 is an explanatory diagram showing another embodiment of the present invention.

FIG. 4 is a front view showing a nut member.

FIG. 5 is an explanatory diagram showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a nut member.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 Nut member 4 Screw hole 6 Outer peripheral pressure contact surface part 7 Bolt member 9 Shaft part 10 Screw shaft part 19 Mirror 22 Thread 23 Weight 28 Notch 29 Disk part 30 Tube part 40 Screw hole 41 Disk part 42 Tube Part 44 Notch L axis

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16B ⁷ /00-7/22 D06F 57/02 G01C 15/06

Claims (2)

(57) [Claims] 1. An outer cylinder 1 and an inner cylinder 2 are provided. The outer cylinder 1 and the inner cylinder 2 are freely slidable in the direction of the axis L and rotatable around the axis L. The nut member 3 is slidably inserted in the axial center L direction, and a bolt member 7 is fixed to one end of the inner cylinder 2. The nut member 3 has disk portions 29 and 41 having screw holes 4 and 40. And the screw
A cylindrical portion 30 having holes 5 and 43 communicatively connected to the holes 4 and 40 ,
42, wherein the cylindrical portions 30 , 42 have notches allowing the diameter to increase.
Parts 28 and 44 and the maximum outer diameter in the free state
It has an outer peripheral pressure contact surface 6 slightly larger than the inner diameter of the cylinder 1.
And, the bolt member 7 includes a shaft portion 9, a screw shaft portion 10 provided on the shaft portion 9, provided with a screw shaft portion 10 of the bolt member 7, a screw hole 4 of the nut member 3, By screwing the nut member 40, the shaft portion 9 of the bolt member 7 presses the inner peripheral surfaces of the holes 5 and 43 of the nut member 3, and the outer peripheral pressure contact surface portion 6 of the nut member 3 expands. A telescopic cylinder structure, which is configured to be pressed against the inner peripheral surface of the outer cylinder 1. 2. An outer cylinder 1 provided with a mirror 19 at its upper end for collimating with a lightwave distance measuring theodolite, and a thread 22 and a thread 22 therein.
Inner cylinder 2 having a conical weight 23 fixed to the lower end of the inner cylinder 2
The outer cylinder 1 and the inner cylinder 2 are slidable relative to each other in the direction of the axis L and rotatable around the axis L.
The nut member 3 is slidably inserted in the direction of the axis L in the inside, and a bolt member 7 is attached to the upper end of the inner cylinder 2.
The nut member 3 is provided with disk portions 29 and 41 having screw holes 4 and 40 and holes connected to and connected to the screw holes 4 and 40.
And cylindrical portions 30 and 42 having portions 5 and 43, respectively.
Has notches 28 and 44 to allow for expansion
The maximum outer diameter in the state is slightly larger than the inner diameter of the outer cylinder 1.
Has an outer peripheral pressing surface portion 6 which, the bolt member 7 includes a shaft portion 9, a screw shaft portion 10 provided on the shaft portion 9, provided with a screw shaft portion 10 of the bolt member 7, the nut By screwing into the screw holes 4 and 40 of the member 3, the shaft 9 of the bolt member 7 presses the inner peripheral surfaces of the holes 5 and 43 of the nut member 3, A telescopic cylinder structure, wherein the outer peripheral pressure contact surface portion 6 is configured to expand and press against the inner peripheral surface of the outer cylinder 1.