JP3223567U - Telescopic pipe construction - Google Patents

Abstract

An object of the present invention is to provide a stretchable pipe structure capable of improving the manufacturability of a support such as a rack provided with a stretchable pipe.
An outer pipe into which an inner pipe is inserted and a substantially cylindrical holding member A that holds a length protruding from the outer pipe of the inner pipe are provided. The holding member is inserted into the outer pipe. An outer pipe housing portion A1 provided with an outer pipe housing space and an inner pipe housing portion A2 provided with an inner pipe housing space into which the inner pipe is inserted. The outer pipe housing portion and the outer pipe The outer pipe positioning means for fixing the position of the outer pipe in the outer pipe receiving space, and the inner pipe receiving portion includes the inner pipe positioning means for fixing the position of the inner pipe in the inner pipe receiving space. Are provided on the inner peripheral surface of the outer pipe accommodating portion and projecting inward, and a fitting portion provided on the outer peripheral surface of the outer pipe and fitted with the projecting portion A1a is provided. Have .
[Selection] Figure 1

Description

  The present invention relates to a stretchable pipe structure that constitutes a stretchable pipe used for a leg portion or the like of a rack.

  A rack that is widely used as furniture and office supplies generally has legs that are configured with pipes that can be expanded and contracted in order to adjust the height of the placement section.

  For example, in Patent Document 1, a telescopic mechanism portion is configured by a vertical pipe and a rack pipe that is movably inserted into a lock mechanism cylinder attached to the outer periphery of the end portion of the vertical pipe. There is described an invention relating to a stretchable pipe structure capable of easily moving a plate or the like up and down and changing a sleeve top plate from a horizontal posture to a vertical posture.

JP 2008-37551 A

  By the way, a general telescopic pipe structure including the invention described in Patent Document 1 includes a lock mechanism for arbitrarily adjusting the degree of protrusion of the inner pipe from the outer pipe. The holding member to be fixed is fixed to the outer periphery of the outer pipe using a screw or an adhesive.

  The operation of fixing the holding member constituting the lock mechanism to the outer pipe is troublesome at the time of manufacture due to the above-described fixing means, and the productivity of the rack itself is deteriorated.

  This invention is made | formed in view of the above actual conditions, and makes it a subject to provide the expansion pipe structure which can improve the manufacturability of support bodies, such as a rack provided with the expansion pipe.

In order to solve the above problems, the present invention includes an outer pipe into which an inner pipe is inserted, and a substantially cylindrical holding member that holds a length of the inner pipe protruding from the outer pipe,
The holding member has an outer pipe housing portion provided with an outer pipe housing space into which the outer pipe is inserted, and an inner pipe housing portion provided with an inner pipe housing space into which the inner pipe is inserted. ,
The outer pipe accommodating portion and the outer pipe include outer pipe positioning means for fixing the position of the outer pipe in the outer pipe accommodating space,
The inner pipe accommodating portion includes an inner pipe positioning means for fixing the position of the inner pipe in the inner pipe accommodating space,
The outer pipe positioning means is provided on the inner peripheral surface of the outer pipe accommodating portion and protrudes inward, and is provided on the outer peripheral surface of the outer pipe and is fitted with the protrusion. A joint section is provided.

  According to the present invention, it is possible to connect the outer pipe and the holding member only by fitting the fitting portion to the protruding portion without using a screw or an adhesive, and it is possible to reduce labor during manufacturing. It becomes.

  In a preferred embodiment of the present invention, the outer peripheral surface of the outer pipe is in surface contact with the inner peripheral surface of the outer pipe housing portion, and the projecting portion can be displaced along the projecting direction and the direction facing the projecting direction. It is configured.

By setting it as such a structure, it becomes possible to fit a fitting part to a protrusion part by displacing a protrusion part by the outer pipe inserted in the outer pipe accommodation space.
That is, the manufacturer can connect the outer pipe and the holding member with a simpler operation, and can further reduce the labor during manufacturing.

  In a preferred embodiment of the present invention, the outer pipe positioning means includes a through window formed in the outer pipe housing portion and an inner peripheral surface of the through window extending along the axial direction of the outer pipe housing portion. The flexible arm portion is provided, and the protruding portion is provided at the tip of the arm portion.

  With such a configuration, the outer pipe and the holding member can be connected with a simple operation, and the structure for displacing the protruding portion becomes simple, which improves the manufacturability of the holding member itself.

  In a preferred form of the present invention, the projecting portion is formed with an inclined portion that gradually inwards as it goes in the direction in which the outer pipe is inserted.

  By adopting such a configuration, when the outer pipe is inserted into the outer pipe housing space, the outer pipe is not caught by the protruding portion, and the bending operation of the arm portion is smoothly performed. It becomes possible to perform connection more quickly.

  In a preferred form of the present invention, a pair of the outer pipe positioning means is provided.

  By setting it as such a structure, it becomes possible to connect an outer pipe and a holding member more stably.

  In a preferred embodiment of the present invention, an abutting wall portion with which the open end of the outer pipe abuts is formed between the outer pipe accommodating portion and the inner pipe accommodating portion.

  With such a configuration, it is possible to prevent the outer pipe from being inserted more than necessary into the holding member.

  In a preferred embodiment of the present invention, the distance from the abutting wall portion to the end surface of the projecting portion facing the abutting wall portion, and the abutting of the fitting portion and the projecting portion from the open end of the outer pipe. The distance to the part is substantially the same.

  With such a configuration, when the outer pipe and the holding member are connected, unexpected sliding of the outer pipe is prevented, and the stability of the support body such as the rack can be ensured.

  In a preferred embodiment of the present invention, a groove provided along the axial direction is formed on the inner peripheral surface of the inner pipe housing.

  By setting it as such a structure, the dynamic frictional force of an inner pipe and an inner pipe accommodating part can be reduced, and the insertion operation | work to the inner pipe accommodation space of an inner pipe becomes easy.

  In a preferred form of the present invention, the inner pipe positioning means is inserted with a nut housing part that protrudes from the inner pipe housing part and is provided with a nut housing space for housing the nut, and a bolt that is screwed into the nut. Bolt insertion holes are provided.

  By setting it as such a structure, it becomes possible to adjust the length which protrudes from the outer pipe of an inner pipe, and a fixing operation | work quickly and easily.

  In a preferred embodiment of the present invention, a tongue piece projecting along the axial direction of the inner pipe housing portion is formed between the inner pipe housing space and the nut housing space.

  By adopting such a configuration, it becomes possible to prevent the inner pipe from being scratched by the contact of the bolt tip.

  ADVANTAGE OF THE INVENTION According to this invention, the expansion-contraction pipe structure which can improve the manufacturability of support bodies, such as a rack provided with the expansion-contraction pipe, can be provided.

It is a figure which shows the holding member with which the expansion-contraction pipe structure which concerns on embodiment of this invention is provided. It is a figure which shows the holding member with which the expansion-contraction pipe structure which concerns on embodiment of this invention is provided. It is a figure which shows the outer pipe with which the expansion-contraction pipe structure which concerns on embodiment of this invention is provided. It is a figure which shows the assembly state of the expansion-contraction pipe structure which concerns on embodiment of this invention. It is a figure which shows the assembly state of the expansion-contraction pipe structure which concerns on embodiment of this invention. It is a figure which shows the state which attached the inner pipe to the expansion-contraction pipe structure which concerns on embodiment of this invention. It is a figure which shows the state which attached the inner pipe to the expansion-contraction pipe structure which concerns on embodiment of this invention.

Hereinafter, the stretchable pipe structure according to the embodiment of the present invention will be described with reference to the drawings.
The following embodiments are examples of the present invention, and the present invention is not limited to the following embodiments. Moreover, in these figures, the code | symbol 1 shows the expansion-pipe structure which concerns on this embodiment.

  FIGS. 1A and 1B are diagrams showing a holding member A provided in the stretchable pipe structure 1, wherein FIG. 1A is a perspective view seen from the outer pipe accommodating portion A1 side, and FIG. 1B is a perspective view seen from the inner pipe accommodating portion A2 side. It is.

As shown in FIG. 1, the holding member A is configured as a substantially rectangular tube as a whole, and is provided with an outer pipe housing space S1 (see FIG. 2) into which the outer pipe B (see FIG. 3) is inserted. A housing portion A1, and an inner pipe housing portion A2 connected to the outer pipe housing portion A1 and provided with an inner pipe housing space S2 (see FIG. 2) into which the inner pipe C (see FIG. 6) is inserted. ing.
Further, the holding member A is entirely configured as a flexible body such as a resin material.
The outer pipe housing space S1 and the inner pipe housing space S2 communicate with each other. Moreover, the holding member A does not necessarily need to be configured as a flexible body as a whole, and only an arm portion A1c described later may be configured as a flexible body.

As shown in FIG. 1A, the outer pipe housing part A1 is provided with a protruding part A1a, a through window A1b, and an arm part A1c as outer pipe positioning means P on both opposing side walls.
In FIG. 1A, only one protrusion A1a is shown.

More specifically, the arm portion A1c extends from the inner peripheral surface of the through window A1b along the axial direction of the outer pipe housing portion A1, and the protruding portion A1a is provided at the tip of the arm portion A1c.
The protruding portion A1a is provided so as to protrude inward from the inner peripheral surface of the outer pipe housing portion A1.

  With such a configuration, the protruding portion A1a is configured to be displaceable along the protruding direction x (see FIG. 5) and the direction facing the protruding direction x with the base end of the arm portion A1c as a fulcrum.

As shown in FIG. 1B, the inner pipe housing portion A2 includes inner pipe positioning means Q that fixes the inner pipe by pressing the inner pipe C against the inner peripheral surface thereof.
Further, in the inner pipe housing portion A2, a groove portion A2a provided along the axial direction of the inner pipe housing portion A2 is formed on the inner peripheral surfaces of the opposite side walls.

  FIGS. 2A and 2B are diagrams showing the holding member A provided in the stretchable pipe structure 1, wherein FIG. 2A is a front view as seen from the inner pipe accommodating portion A2 side, FIG. 2B is a bottom view, and FIG. FIG.

As shown in FIGS. 2 (a) and 2 (b), the inner pipe positioning means Q protrudes downward from the inner pipe housing portion A2 and accommodates a nut n (see FIG. 6). And a bolt insertion hole Q2 through which a bolt (see FIG. 6) to be screwed into the nut n is inserted.
In addition, a tongue piece Q3 extending along the axial direction of the inner pipe housing portion A2 is formed between the inner pipe housing space S2 and the nut housing space S3.
The nut accommodating portion Q1 is provided with a substantially thin plate-like projecting piece h that projects from the inner peripheral surfaces of the opposing side walls.

As shown in FIG. 2C, the outer pipe housing space S1 and the inner pipe housing space S2 are arranged substantially coaxially, and the diameter of the inner pipe housing space S2 is larger than the diameter of the outer pipe housing space S1. It is slightly smaller.
Thus, a contact wall portion W with which the open end of the outer pipe B contacts is formed between the outer pipe housing portion A1 and the inner pipe housing portion A2.
The direction j is the axial direction of the outer pipe housing part A1 and the inner pipe housing part A2.

As shown in FIG. 3, the outer pipe B included in the telescopic pipe structure 1 has a substantially rectangular tube shape, and is fitted to the protruding portion A1a as the outer pipe positioning means P at the ends of the opposite side surfaces. A fitting portion B1 is provided.
The fitting portion B1 is a circular through hole in the present embodiment, but may be a groove or the like as long as the fitting portion B1 can be fitted with the protruding portion A1a.
In FIG. 3, only one of the fitting portions B1 is shown.

Here, a manufacturer of a support body such as a rack using the stretchable pipe structure 1 inserts the outer pipe B into the outer pipe housing space S1, as shown in FIG. As a result, the state shown in FIG.
That is, when the outer pipe B is inserted into the outer pipe housing space S1, the projecting portion A1a is displaced in a direction opposite to the projecting direction x, and the pair of projecting portions A1a are expanded. And if fitting part B1 is arrange | positioned in the substantially the same position as protrusion part A1a, protrusion part A1a will displace to the protrusion direction x with an elastic force, and it will be fitted by fitting part B1.

  Thereby, the sliding operation in the direction opposite to the direction d of the outer pipe B is restrained. At this time, the outer circumferential surface of the outer pipe B inserted into the outer pipe housing space S1 and the inner circumferential surface of the outer pipe housing portion A1 are in surface contact as a whole.

  FIG. 5 is a cross-sectional view taken along line YY ′ in FIG.

As shown in FIG. 5, a pair of outer pipe positioning means P configured by the protruding portion A1a, the through window A1b, the arm portion A1c, and the fitting portion B1 is provided.
In addition, the protruding portion A1a is formed with an inclined portion g that gradually inwards as it goes in the direction in which the outer pipe is inserted (direction d in FIG. 4A).

  Further, the distance from the abutting wall portion W to the end face of the protruding portion A1a facing the abutting wall portion W and the distance from the opening end of the outer pipe B to the abutting portion between the fitting portion B1 and the protruding portion A1a are as follows: Are substantially the same (see distance r in FIG. 5).

Here, when assembling the expansion and contraction pipe using the expansion and contraction pipe structure 1, the manufacturer inserts the inner pipe C into the inner pipe accommodation space S2 as shown in FIG. ).
At this time, the manufacturer accommodates the nut n in the nut accommodating space S3, inserts the bolt b into the bolt insertion hole Q2, and then tightens the bolt b, so that the inner pipe C becomes in the inner pipe accommodating portion A2. It is pressed and fixed to the peripheral surface.
Note that when adjusting the length of the inner pipe C protruding from the outer pipe B, the bolt b may be loosened as appropriate, and the inner pipe C may be slid in the length direction.

FIG. 7 is a cross-sectional view taken along the line ZZ ′ in FIG.
In FIG. 7, the parts other than the bolt b are shown in cross section.

  As shown in FIG. 7, the tongue piece portion Q3 is pushed up by tightening the bolt b, and the inner pipe C is sandwiched between the tongue piece portion Q3 and the inner peripheral surface of the inner pipe housing portion A2.

  According to this embodiment, the outer pipe B and the holding member A can be connected by the outer pipe positioning means P only by fitting the fitting portion B1 to the protruding portion A1a without using screws or adhesives. This makes it possible to reduce labor during manufacturing.

  Further, the outer pipe positioning means P is provided with a through window A1b and a flexible arm portion A1c, and the protruding portion A1a is provided at the tip of the arm portion A1c. In addition to being able to connect the outer pipe B and the holding member A, the structure for displacing the protrusion A1a becomes simple, and the productivity of the holding member A itself is improved.

  In addition, since the protruding portion A1a is formed with an inclined portion g that gradually inwards in the direction d in which the outer pipe B is inserted, the outer pipe B is inserted into the outer pipe housing space S1. Since the outer pipe B is not caught by the protrusion A1a and the arm part A1c is bent smoothly, the outer pipe B and the holding member A can be more quickly connected.

  Moreover, since the outer pipe positioning means P is provided in a pair, the outer pipe B and the holding member A can be more stably connected.

  In addition, the outer pipe B is required inside the holding member A because the abutting wall portion W with which the open end of the outer pipe B abuts is formed between the outer pipe accommodating portion A1 and the inner pipe accommodating portion A2. It is possible to prevent the insertion.

  Further, the distance from the abutting wall portion W to the end surface of the protruding portion A1a facing the abutting wall portion W and the distance from the opening end of the outer pipe B to the abutting portion between the fitting portion B1 and the protruding portion A1a are as follows. By being substantially the same, when the outer pipe B and the holding member A are connected, unexpected sliding of the outer pipe B is prevented, and the stability of the support body such as a rack can be ensured.

  Further, the groove A2a provided along the axial direction j is formed on the inner peripheral surface of the inner pipe housing portion A2, thereby reducing the dynamic frictional force between the inner pipe C and the inner pipe housing portion A2. The work of inserting the inner pipe C into the inner pipe housing space S2 is facilitated.

  Further, since the inner pipe positioning means Q is provided with the nut accommodating portion Q1 and the bolt insertion hole Q2, the adjustment and fixing work of the length of the inner pipe C protruding from the outer pipe B can be performed quickly and easily. Can be done.

  Further, a tongue piece Q3 extending along the axial direction j of the inner pipe housing portion A2 is formed between the inner pipe housing space S2 and the nut housing space S3, so that the contact of the tip of the bolt b is made. This makes it possible to prevent the inner pipe C from being scratched.

  It should be noted that the shapes, dimensions, and the like of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like.

For example, in the present embodiment, the holding member A, the outer pipe B, and the inner pipe C are all shown in a substantially rectangular tube shape, but may be all in a substantially round tube shape.
In addition to this, for example, the outer pipe B is formed in a substantially rectangular tube shape, the inner pipe C is formed in a substantially circular tube shape, and the housing spaces S1 and S2 are configured according to the shapes of the outer pipe B and the inner pipe C. Such an aspect may be adopted.

DESCRIPTION OF SYMBOLS 1 Telescopic pipe structure A Holding member A1 Outer pipe accommodating part A1a Protruding part A1b Through window A1c Arm part A2 Inner pipe accommodating part A2a Groove part W Contacting wall part G Inclined part B Outer pipe B1 Fitting part P Outer pipe positioning means Q Inner pipe positioning means Q1 Nut housing part Q2 Bolt insertion hole Q3 Tongue piece h Projecting piece S1 Outer pipe housing space S2 Inner pipe housing space S3 Nut housing space n Nut b Bolt C Inner pipe

Claims (10)

An outer pipe into which the inner pipe is inserted, and a substantially cylindrical holding member that holds the length of the inner pipe protruding from the outer pipe,
The holding member has an outer pipe housing portion provided with an outer pipe housing space into which the outer pipe is inserted, and an inner pipe housing portion provided with an inner pipe housing space into which the inner pipe is inserted. ,
The outer pipe accommodating portion and the outer pipe include outer pipe positioning means for fixing the position of the outer pipe in the outer pipe accommodating space,
The inner pipe accommodating portion includes an inner pipe positioning means for fixing the position of the inner pipe in the inner pipe accommodating space,
The outer pipe positioning means is provided on the inner peripheral surface of the outer pipe accommodating portion and protrudes inward, and is provided on the outer peripheral surface of the outer pipe and is fitted with the protrusion. A telescopic pipe structure provided with a joint. The outer peripheral surface of the outer pipe is in surface contact with the inner peripheral surface of the outer pipe housing portion,
The stretchable pipe structure according to claim 1, wherein the projecting portion is configured to be displaceable along a projecting direction and a direction facing the projecting direction. The outer pipe positioning means includes a through window formed in the outer pipe housing portion, and a flexible arm extending from the inner peripheral surface of the through window along the axial direction of the outer pipe housing portion. Are provided, and
The telescopic pipe structure according to claim 1 or 2, wherein the protruding portion is provided at a tip of the arm portion.   The stretchable pipe structure according to any one of claims 1 to 3, wherein the projecting part is formed with an inclined part that gradually inwards as it goes in a direction in which the outer pipe is inserted.   The stretchable pipe structure according to any one of claims 1 to 4, wherein a pair of the outer pipe positioning means is provided.   The stretchable pipe structure according to any one of claims 1 to 5, wherein an abutting wall portion with which an open end of the outer pipe abuts is formed between the outer pipe accommodating portion and the inner pipe accommodating portion. body.   The distance from the abutting wall portion to the end surface of the projecting portion facing the abutting wall portion, and the distance from the open end of the outer pipe to the abutting portion of the fitting portion and the projecting portion are approximately The stretchable pipe construction according to claim 6, which is the same.   The stretchable pipe structure according to any one of claims 1 to 7, wherein a groove provided along the axial direction is formed on an inner peripheral surface of the inner pipe accommodating portion.   The inner pipe positioning means includes a nut housing portion protruding from the inner pipe housing portion and provided with a nut housing space for housing a nut, and a bolt insertion hole through which a bolt screwed into the nut is inserted. The stretchable pipe structure according to any one of claims 1 to 8, which is provided. The elastic pipe structure according to claim 9, wherein a tongue piece extending along the axial direction of the inner pipe accommodating portion is formed between the inner pipe accommodating space and the nut accommodating space. .