JPH0338363Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a pipe support mainly used in construction, and more specifically, a plurality of pairs of opposed small holes are bored at appropriate intervals in the axial direction in an inner pipe slidably inserted into an outer pipe. At the same time, a threaded portion is formed at the upper end of the outer tube, and an axially long opposing elongated hole is bored in the threaded portion, and the opposing elongated hole of the outer tube and the opposing small hole of the inner tube are formed. The present invention relates to a pipe support configured such that a pin inserted through the outer tube is supported by an upper end surface of a nut member for finely adjusting the overall length of the pipe which is externally screwed onto the threaded portion of the outer tube.

For this type of pipe support, an inner tube that has an outer diameter that is approximately equal to the inner diameter of the outer tube is not used, but an inner tube that has an outer diameter that is somewhat smaller than the inner diameter of the outer tube is usually used. It is. In other words, a certain amount of allowance (clearance) is provided between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube.
This is to prevent insertion of the inner tube into the outer tube and relative sliding of the two tubes from becoming impossible even if some mud or concrete adheres to the outer peripheral surface of the inner tube.

Therefore, some measure is required between the outer tube and the inner tube to prevent the inner tube from swinging.

As a measure to prevent the inner pipe from swaying, the following configuration has conventionally been adopted.

That is, as shown in FIG. 5, a portion of the inner circumferential surface of the outer tube a below the threaded portion e formed at the upper end of the outer tube a is continuously inwardly formed in the circumferential direction by means such as rolling pressure molding. An annular ridge b is formed to protrude from the inner tube d, and the inner circumferential surface of the annular ridge b and the inner circumferential surface of the cap c with a central hole attached to the upper end of the outer tube prevent the inner tube d from swinging. I tried to support him in this way.

However, in the case of such a conventional structure, a small-diameter portion is formed along the entire circumference in the middle of the outer tube, so mud, dirt, etc. attached to the outer circumferential surface of the inner tube d are If it gets stuck in the annular ridge b of the outer tube a, it becomes difficult for the inner tube d to slide.
If you pull it out forcibly, the annular ridge b of the outer tube a and the inner tube d
This resulted in deformation, which resulted in deterioration of durability and a decline in steady rest function. Furthermore, since the ridge b is provided at a position considerably lower than the upper end of the outer tube a, the inner tube d must be deeply inserted into the outer tube a.
The length of the inner tube d could not be used effectively.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to effectively utilize the length of the inner tube while preventing the outer tube from having poor durability against lateral external forces and from clogging the tube. The purpose of the present invention is to provide a pipe support that prevents the inner pipe from swaying.

In the pipe support according to the present invention, which has the basic configuration described at the beginning, the inner diameter of the outer pipe of the threaded portion formed at the upper end of the outer pipe is adjusted to the inner diameter of the inner pipe with the inner pipe inserted into the outer pipe. The outer diameter of the inner tube is larger than the outer diameter of the inner tube so as to have a predetermined clearance between the outer circumferential surface and the inner circumferential surface of the threaded portion,
The present invention is characterized in that a plurality of ridges for steady rest extending in the axial direction and bulging inward from the inner diameter of the threaded portion are formed in the circumferential direction in the threaded portion forming region of the outer tube by press working.

With this configuration, the lower end of the inner tube inserted into the outer tube can be pulled up to the threaded portion at the upper end of the outer tube, and the length of the inner and outer tubes can be effectively utilized. In addition, even if mud, sand, etc. adhere to the outer circumferential surface of the inner pipe, the mud, sand, etc. can escape from the clearances between the ridges arranged at intervals in the circumferential direction, preventing the pipe from becoming clogged. The inner tube can be moved up and down smoothly without any trouble.

Embodiments of the present invention will be described below with reference to the drawings.

The pipe support shown in FIGS. 1 to 4 is constructed as follows.

That is, 1 is an outer tube having a substantially square base plate 2 attached to its lower end, and 3 is an inner tube having a substantially square receiving plate 4 attached to its upper end.

The inner tube 3 has a slightly smaller diameter than the outer tube 1, and is inserted into the outer tube 1 so as to be slidable and fixed in the axial direction. The inner tube 3 has small holes 5, 5 facing each other in the radial direction at appropriate intervals in the axial direction.
are drilled in multiple pairs.

A threaded portion 6 is formed at the upper end of the outer tube 1 over an appropriate length range. Although this threaded portion 6 is formed by rolling pressure molding using a well-known thread rolling device, it may also be threaded using a similarly well-known lathe or the like. Further, although this threaded portion 6 is formed into a square thread, it may be formed into a thread of another shape. The inner diameter of the outer tube 1 of this threaded portion 6 is the second
As shown in the figure, there is a predetermined clearance between the outer circumferential surface of the inner tube 3 and the inner circumferential surface of the threaded portion 6 when the inner tube 3 is inserted into the outer tube 1 and is larger than the outer diameter of the inner tube 3. It is formed to have. The threaded portion 6 is provided with a pair of axially long holes 7, 7 that face each other in the radial direction.

8 is an engagement pin with a fall prevention chain 8a, which is inserted across the opposed long holes 7, 7 of the outer tube 1 and arbitrary opposed small holes 5, 5 of the inner tube 3; The outer pipe 1 and the inner pipe 3 are engaged with each other in an appropriate positional relationship, and the total length of the pipe support is basically (roughly) determined.

Numeral 9 is a nut member for finely adjusting the overall length of the pipe support, and is movable in the axial direction on the threaded portion 6 at the upper end of the outer tube 1 while supporting the pin 8 with its upper end surface 9A. They are screwed together. In other words, by rotating the handle 9B swingably attached to the side thereof and moving the pin 8 in the axial direction within the long holes 7, 7, the outer tube 1 and the inner tube 3 are connected. In other words, the overall length of the pipe support can be slightly adjusted.

Reference numeral 10 denotes a cap screwed onto the upper end of the outer tube 1, and has a hole 10A in the center that is approximately equal to the outer diameter of the inner tube 3, and the inner circumferential surface of the hole 10A connects the inner tube 3. is regulated so that it is located at the center of the outer tube 1. This gap 10 is integrally molded from synthetic resin (for example, polypropylene).

The outer surface of the threaded portion 6 forming area of the outer tube 1 is recessed along the axial direction, and the steady rest ridge portion 11 bulges inwardly than the inner diameter of the threaded portion 6 on the inner surface side. A plurality of ridges 11 are formed in the circumferential direction, and even when the inner tube 3 is extended upwardly, these ridges 11 and the cap 10 keep the inner tube 3
The structure is designed to provide a steady rest function.

When the inner pipe 3 is extended upward, the span of the pipe support as a whole becomes longer, and a large buckling stress is generated in the middle part of the span due to a large load. The steady rest function can suppress buckling stress as much as possible, and
By forming ridges 11 that are long in the axial direction in the threaded portion 6, the unevenness of the ridges 11 and the unevenness of the threaded portion 6 form a wavy shape in the shape of a # digit, thereby resisting external forces. It has the advantage of being extremely durable.

Note that the pipe support is entirely galvanized. It is desirable that the rolling pressure molding of the threaded portion 6 and the press molding of the ridges 11 in the outer tube 1 be performed after the outer tube 1 is galvanized.

In the pipe support configured as described above, the outer pipe 1 is placed on the floor using the base plate 2, and the inner pipe 3 is slid upward in the axial direction from inside the outer pipe 1, so that the supported pair ( (not shown), insert the pin 8 into the elongated holes 7, 7 and the small holes 5, 5 to temporarily secure the pin 8, and then rotate the fine adjustment nut member 9 with the handle 9A. The total length of the pipe support is finely adjusted to an appropriate support length.

It should be noted that if fluorescent paint or the like is applied to the outer surface of the ridges 11, the presence of the pipe support will be more visible even at night, which is advantageous in terms of safety.

In summary, in the pipe support according to the present invention, the inner diameter of the outer pipe of the threaded part formed at the upper end of the outer pipe is connected to the outer peripheral surface of the inner pipe and the inner periphery of the threaded part with the inner pipe inserted into the outer pipe. The outer diameter of the inner tube is larger than the outer diameter of the inner tube so as to have a predetermined clearance between the outer tube and the outer tube, and the threaded portion of the outer tube is bulged inward than the inner diameter of the threaded portion by press working. Since a plurality of ridges for steady rest along the axial direction are formed in the circumferential direction, external force in the form of a # digit is generated by the unevenness caused by the ridged portion along the axial direction and the unevenness caused by the threaded portion formed in the circumferential direction. It is possible to create a structure that can exhibit extremely strong durability against
As shown in the publication, if the inner diameter of the outer pipe at the threaded part is made to be approximately the same as the outer diameter of the inner pipe, it becomes difficult for the inner pipe to slide due to clogging with mud and sand, and during this period When the earth and sand become clogged, it becomes even more difficult to remove it, which deforms the inner and outer tubes, making it difficult to adjust them using the adjustment nut screwed into the threaded portion of the outer tube.
The present invention has the advantage that the inner tube can slide smoothly without clogging by forming the clearance on the inner surface of the threaded portion.

In addition, the steady rest means can be made by press working.
When a ridge is formed on the inner peripheral surface of the pipe by separately forming a circumferentially continuous annular recess in the threaded part with a width different from the pitch of the threaded part, the annular recess in that part Although the function as a screw part for the adjusting nut member is impaired, in the present invention, regardless of whether the steady rest ridge is formed by press processing, which is easy to process, the ridge is formed in the circumferential direction. Since it is formed in the longitudinal direction of the tube, which is substantially perpendicular to the concave portion of the screw, the screw function is not impaired.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the pipe support according to the present invention, in which FIG. 1 is an enlarged side view of the main part, FIG. 2 is an enlarged side view with a partial cross section of the main part, and FIG. 1 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 4 is an overall side view, and FIG. 5 is an overall side view with some parts omitted of a conventional pipe support. 1...outer tube, 3...inner tube, 5...small hole, 6...
Threaded portion, 7...long hole, 8...pin, 9...nut member, 11...ridge portion.

Claims (1)

[Scope of utility model registration request] A plurality of pairs of opposing small holes 5, 5 are bored at appropriate intervals in the axial direction in the inner tube 3 which is slidably inserted into the outer tube 1, and a threaded portion 6 is provided at the upper end of the outer tube 1. and axially long opposed long holes 7, 7 are bored in the threaded portion 6 of the outer tube 1.
7 and the opposed small holes 5, 5 of the inner tube 3 are supported by the upper end surface of a nut member 9 for fine adjustment of the overall length of the pipe which is externally screwed onto the threaded portion 6 of the outer tube 1. In a pipe support configured as such, the inner diameter of the outer tube 1 of the threaded portion 6 formed at the upper end of the outer tube 1 is adjusted to the outer peripheral surface of the inner tube 3 when the inner tube 3 is inserted into the outer tube 1. The outer diameter of the inner tube 3 is larger than the outer diameter of the inner tube 3 so as to have a predetermined clearance between the outer tube 1 and the inner circumferential surface of the threaded section 6. A pipe support characterized in that a plurality of steady rest ridges 11 are formed in the circumferential direction along the axial direction and bulge inward from the inner diameter of the threaded part 6.