JP2023037361A - Height adjustment device - Google Patents

Abstract

To facilitate adjustment of the height of a support member.SOLUTION: There is provided a height adjustment device that is provided between a support member P and the ground and raises and lowers the lower end position of the support member P, including a first member 30 having a screw shaft A that rises above the ground and has a male threaded portion a on the outer periphery thereof, and a female threaded portion 36 that is screwed into the male threaded portion a. The first member 30 includes a pair of opening/closing pieces 31 and 32 which are rotatably supported by bases 33, 34 and 35 provided at one end and have the female threaded portion 36. The pair of opening/closing pieces 31 and 32 are rotatable between a locked state in which the male threaded portion a and the female threaded portion 36 are engaged with each other, and an open state in which the male threaded portion a and the female threaded portion 36 are separated from each other by opening the other ends of the pair of opening/closing pieces 31 and 32.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height adjusting device that is used for temporary scaffolding and the like and that adjusts the height of various support members.

Temporary scaffolding generally consists of beams connecting a plurality of support members arranged along the outer wall of a building, and scaffolding boards fixed along the beams. A height adjustment device, a so-called jack device, is often arranged at the lower end of the support member in order to adjust the lower end position of the support member. As this height adjustment device, for example, there is one described in Patent Document 1.

Japanese Unexamined Patent Application Publication No. 2010-1687

In the temporary scaffolding and the like as described above, there are cases where it is desired to adjust the lower end position of the support member in the vertical direction with respect to the ground at the installation location. For example, when the ground is slanted, when the ground is uneven, and the like.

In the height adjustment device described in Patent Document 1, a receiving member that supports the lower end of a support member is screwed to a support shaft rising from a base member placed on the ground. Therefore, when adjusting the height of the strut member, it is necessary to rotate the receiving member around the support shaft. At this time, the amount of elevation of the receiving member is about several millimeters to several centimeters per one rotation about the axis, so when the amount of height adjustment is large, the work is complicated and requires time and effort.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to facilitate adjustment of the height of a support member used in a structure such as a temporary scaffold.

In order to solve the above-mentioned problems, the present invention provides a height adjusting device for raising and lowering the lower end position of a support member with respect to a screw shaft having a male threaded portion on the outer periphery thereof. A first member having a threaded female screw portion is provided, the first member is rotatably supported by a base portion provided at one end thereof, and has a pair of opening and closing pieces formed with the female screw portion, The pair of opening/closing pieces has a locked state in which the male screw portion and the female screw portion are engaged, and an open state in which the other end of the pair of opening/closing pieces is opened and the male screw portion and the female screw portion are disengaged. A height adjustment device that can rotate between

Here, a configuration including a second member connected to the first member and a rotating mechanism for rotating the pair of opening/closing pieces by moving the second member up and down with respect to the first member is adopted. be able to.

Further, the rotating mechanism may employ a configuration having a function of holding the locked state.

In each of these aspects, the rotating mechanism includes an operating shaft that moves up and down together with the second member, an operating projection provided on the operating shaft, and an operating groove provided on the first member into which the operating projection enters. and the direction in which the working groove extends is inclined with respect to the axial direction of the working shaft.

Further, it is possible to employ a configuration in which the working shaft is prevented from rotating around its axis by a rotation-preventing protrusion provided on the working shaft being inserted into a rotation-preventing groove provided on the first member. .

INDUSTRIAL APPLICABILITY The present invention facilitates adjustment of the height of a strut member used in a structure such as a temporary scaffold.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an enlarged perspective view of essential parts according to the first embodiment of the present invention; The perspective view which shows the state which made the 1st member and the 2nd member approach. The perspective view which shows the state which separated the 1st member and the 2nd member. FIG. 2 is an enlarged side view of a main part showing the same embodiment; IV-IV cross-sectional view of FIG. VV sectional view of FIG. 3 (locked state) VV sectional view of FIG. 3 (open state) FIG. 11 is an enlarged perspective view of a main portion according to the second embodiment of the invention (locked state); FIG. 10 is an enlarged perspective view of a main part (intermediate state) according to the second embodiment of the present invention; FIG. 10 is an enlarged perspective view of a main portion (open state) according to the second embodiment of the present invention; A perspective view of the first member in FIG. 6C The perspective view which shows the use condition of 1st embodiment. The perspective view which shows the usage condition of 2nd embodiment.

A first embodiment of the invention is shown in FIGS. 1-5B and 8. FIG. This embodiment is a height adjustment device 1 used under a structure such as a temporary scaffold. In general, a temporary scaffold is constructed by connecting a plurality of support members P, P arranged along the outer wall of a building with beams, and scaffolding boards are fixed along the beams. The height adjustment device 1 is arranged at the lower end of the support member P. As shown in FIG.

The height adjustment device 1 adjusts the lower end position of the support member P with respect to the ground. By adjusting the lower end position of the support member P, even if the ground at the location where the structure is installed has a slope or unevenness, the gap between the structure and the ground is eliminated, and the installation state is stabilized. can be made The height adjustment device 1 is premised on a vertical screw shaft A rising from the ground as an installation target. As shown in FIG. 8, the screw shaft A is integrally fixed to a plate-like base portion B placed on the ground by welding or the like. A male screw portion a is formed on the outer circumference of the screw shaft A. As shown in FIG.

The height adjustment device 1 includes a first member 30 having a female screw portion 36 screwed onto the male screw portion a, and a second member 40 connected to the first member 30 and supporting the lower end of the support member P. and

The first member 30 is an annular member surrounding the screw shaft A around its axis. In this embodiment, the first member 30 is composed of a pair of arcuate opening/closing pieces 31 and 32 . As shown in FIG. 1, the pair of opening/closing pieces 31 and 32 are rotatably supported by bases 33, 34, and 35 provided at one end (hereinafter referred to as one end) along the circumferential direction. ing. By pivoting around the bases 33, 34, 35, the pair of opening and closing pieces 31, 32 move to the other end opposite to the one end across the axis of the first member 30 (hereinafter referred to as the other end). ) can be opened and closed freely. However, in this embodiment, the pair of opening/closing pieces 31 and 32 are arc-shaped members extending from one end to the other end. Any shape is acceptable. One of the pair of opening and closing pieces 31 and 32 is hereinafter referred to as the first opening and closing piece 31 and the other as the second opening and closing piece 32 .

The base portion 34 of the first opening/closing piece 31 is provided so as to protrude sideways in the middle of the first opening/closing piece 31 in the vertical direction. The bases 33 and 35 of the second opening/closing piece 32 are spaced apart in the vertical direction so as to protrude sideways. Therefore, the base portion 34 of the first opening/closing piece 31 can be inserted between the base portions 33 and 35 of the second opening/closing piece 32 . The first opening/closing piece 31 and the second opening/closing piece 32 are rotatably supported by inserting an operating shaft 41, which will be described later, through holes 33a, 34a, and 35a provided in the bases 33, 34, and 35. there is It should be noted that reference numeral 2 in the drawing denotes a handle portion with which the operator grips the height adjustment device 1 by hand.

A female screw portion 36 is formed on the inner circumference of the first member 30 . The female screw portion 36 is formed along the inner peripheral surfaces of the pair of opening/closing pieces 31 and 32 . When the other ends of the first opening/closing piece 31 and the second opening/closing piece 32 are closed as the first opening/closing piece 31 and the second opening/closing piece 32 are opened and closed, the male screw portion a and the female screw of the screw shaft A are connected. When the other ends of the first opening/closing piece 31 and the second opening/closing piece 32 are opened, the male threaded portion a and the female threaded portion 36 are separated from each other. In the locked state, by rotating the first member 30 around the screw shaft A, the first member 30 is rotated with respect to the screw shaft A while the male screw portion a and the female screw portion 36 are engaged with each other. It moves up and down along the axis of A.

Rotation (opening and closing) of the first opening/closing piece 31 and the second opening/closing piece 32 is performed by a rotation mechanism 50 . The rotating mechanism 50 functions by moving the action shaft 41 functioning as the center of rotation of the first opening/closing piece 31 and the second opening/closing piece 32 vertically with respect to the first member 30 together with the second member 40 . there is In the embodiment, the operating shaft 41 is press-fitted and fixed in a hole 42 a provided in the base portion 42 of the second member 40 . However, the working shaft 41 and the second member 40 may be molded as an integral member.

The working shaft 41 is provided with a working projection 51 projecting sideways. The working protrusion 51 is inserted into the working groove 52 formed in the hole 33 a of the first member 30 . Furthermore, in this embodiment, the action shaft 41 is provided with a detent protrusion 53 separate from the action protrusion 51 . The anti-rotation protrusion 53 is inserted into the anti-rotation groove 54 formed in the hole 34 a of the first member 30 . The working projection 51 and the anti-rotation projection 53 are provided in different orientations along the direction around the working shaft 41 .

The working groove 52 into which the working projection 51 is inserted is provided in a direction inclined with respect to the axial direction of the working shaft 41 (see FIGS. 3, 5A and 5B). A detent groove 54 into which the detent projection 53 is inserted is provided parallel to the axial direction of the operating shaft 41 (see FIG. 4). Since the anti-rotation protrusion 53 is inserted into the anti-rotation groove 54 of the first member 30 , even if the operating shaft 41 moves up and down with respect to the first member 30 , the second opening/closing piece 32 and the operating shaft 41 are not separated from each other. No relative rotation around the axis. Further, since the action projection 51 is inserted into the action groove 52 of the first member 30 , when the action shaft 41 moves up and down with respect to the first member 30 , the first opening/closing piece 33 rotates about the action shaft 41 . Rotate relative to Therefore, the other ends of the first opening/closing piece 31 and the second opening/closing piece 32 are opened and closed by raising and lowering the working shaft 41 with respect to the first member 30 .

In this embodiment, the anti-rotation groove 54 is parallel to the axial direction of the working shaft 41 and the working groove 52 is inclined with respect to the axial direction of the working shaft 41 . As long as the other ends of the first opening/closing piece 31 and the second opening/closing piece 32 are opened and closed, the direction in which the working groove 52 and the anti-rotation groove 54 extend can be changed. For example, both the direction of the action groove 52 and the direction of the anti-rotation groove 54 may be inclined with respect to the axial direction of the action shaft 41 . In this case, both the protrusions 51 and 53 and the grooves 52 and 54 contribute to the opening and closing of the first opening/closing piece 31 and the second opening/closing piece 32 .

The rotation mechanism 50 also has a function of maintaining the locked state of the height adjustment device 1 with respect to the screw shaft A. As shown in FIG. That is, in the embodiment, the first opening/closing piece 31 and the second opening/closing piece 32 are maintained in the locked state unless the operating shaft 41 is pulled upward with respect to the first member 30, which is contrary to the operator's intention. It never transitions to the open state. At this time, if an appropriate amount of friction is generated between the working projection 51 and the working groove 52, the working shaft 41 will not move toward the first member 30 unless a certain amount of external force is applied to the working shaft 41. I can't get out of Therefore, it is possible to maintain the locked state more reliably.

Here, as shown in FIG. 3, the working projection 51 is locked at an angle (obtuse angle) α of the working groove 52 (upper working groove 52a) with respect to the horizontal direction when the working projection 51 is in the open state. If the inclination angle (obtuse angle) β of the working groove 52 (lower working groove 52b) with respect to the horizontal direction is made small at the position where the first opening/closing piece 31 and the second opening/closing piece 32 are locked, the locked state of the first opening/closing piece 31 and the second opening/closing piece 32 is further stabilized. . That is, it is desirable that the direction of the lower working groove 52b corresponding to the locked state be closer to the vertical direction, that is, the axial direction of the working shaft 41, than the direction of the upper working groove 52a corresponding to the open state. This is also the case when the detent groove 54 is inclined.

As described above, when the other ends of the first opening/closing piece 31 and the second opening/closing piece 32 are closed (locked state of the first member 30), the first member 30 is rotated around the screw shaft A. By rotating, the first member 30 moves up and down with respect to the screw axis A along the axial direction of the screw axis A while the male screw part a and the female screw part 36 are engaged with each other. However, when the height by which the first member 30 is moved up and down (hereinafter referred to as adjustment height) is large, the number of times the first member 30 is rotated about the screw shaft A becomes very large. Therefore, the operator has to rotate the first member 30 many times, which takes time and effort. However, according to the present invention, the first member 30 is once detached from the screw shaft A by opening the first member 30 from the locked state, and the first member 30 is released at an arbitrary axial position of the screw shaft A. By setting the locked state, the position of the first member 30 can be adjusted immediately. This makes it possible to facilitate the work and shorten the work time. It should be noted that subsequent fine adjustment of the height can be performed by rotating the first member 30 around the screw shaft A as in the conventional art.

By the way, the second member 40 functions as a receiving member that supports the lower end of the support member P. As shown in FIG. The second member 40 is connected above the first member 30 so that the load from the support member P and above is transmitted to the screw shaft A through the first member 30 . The second member 40 includes an annular receiving portion 3 on which the lower end of the support member P is placed on the inner diameter side of the peripheral wall portion 4 which is circular in plan view. When the lower end of the support member P is placed on the receiving portion 3, the support member P is held by the peripheral wall portion 4 so that the support member P does not come off the second member 40 and fall off.

As described above, the second member 40 has the function of rotating the first opening/closing piece 31 and the second opening/closing piece 32 in the rotation mechanism 50 and the function of rotating the first opening/closing piece 31 and the second opening/closing piece 32 . In addition, the function of supporting the support member P can also be exhibited. This reduces the number of parts and simplifies the structure.

A second embodiment of the invention is shown in FIGS. In this embodiment, a first member 30 is provided with a handle portion 2 for gripping the height adjustment device 1 by hand. Other configurations are the same as those of the first embodiment, so description thereof will be omitted.

In each of the above-described embodiments, the mode of use of the height adjustment device of the present invention has been described using temporary scaffolding used at construction sites and the like. is not limited to, for example, it can be applied to other uses such as a temporary stage, a temporary bridge, and an assembly type rack (shelf). Further, in each of the above-described embodiments, the material of each member is metal, but the material of the member may be other material such as resin as long as it has predetermined strength and durability.

1 Height Adjusting Device 2 Handle Part 3 Receiving Part 4 Peripheral Wall Part 30 First Members 31, 32 Opening/Closing Piece 40 Second Member 50 Rotating Mechanism 51 Action Protrusion 52 Action Groove 53 Detent Protrusion 54 Detent Groove P Post Member

Claims (5)

In a height adjustment device that raises and lowers the lower end position of a support member (P) with respect to a screw shaft (A) that rises above the ground and has a male threaded portion (a) on its outer periphery,
A first member (30) having a female threaded portion (36) screwed to the male threaded portion (a),
The first member (30) is rotatably supported by bases (33, 34, 35) provided at one end thereof, and a pair of opening/closing pieces (31, 32) formed with the female screw portion (36). ),
The pair of opening/closing pieces (31, 32) is in a locked state in which the male screw portion (a) and the female screw portion (36) are engaged, and the other end of the pair of opening/closing pieces (31, 32) is opened. a height adjusting device which is rotatable between an open state in which the male threaded portion (a) and the female threaded portion (36) are disengaged. a second member (40) connected to the first member (30);
a rotation mechanism (50) for rotating the pair of opening/closing pieces (31, 32) by raising and lowering the second member (40) with respect to the first member (30);
2. The height adjustment device of claim 1, comprising: 3. The height adjustment device according to claim 2, wherein the rotating mechanism (50) has a function of holding the locked state. The rotating mechanism (50) includes an operating shaft (41) that moves up and down together with the second member (40), an operating projection (51) provided on the operating shaft (41), and the first member (30). ) provided in the working groove (52) into which the working projection (51) enters,
The height adjustment device according to claim 2 or 3, wherein the extending direction of the working groove (52) is inclined with respect to the axial direction of the working shaft (41). The anti-rotation protrusion (53) provided on the working shaft (41) is inserted into the anti-rotation groove (54) provided on the first member (30), so that the working shaft (41) rotates around the axis. 5. The height adjustment device according to claim 4, wherein the rotation is prevented by

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