JP2008150150A - Slip-off preventing structure of scaffolding jack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slip-off preventing structure of a scaffolding jack preventing a leg from slipping off from a base jack. <P>SOLUTION: A body 15 of a slip-off stop implement 11 is fitted to the outer periphery of a rotation body 13 with a handle. The slip-off stop implement 11 comprises a plate spring piece 16 provided projecting from the body 15. The plate spring piece 16 presses and holds the leg 14 between itself and a base jack 12 and energizes the leg 14 toward the outer peripheral surface of the base jack 12. The plate spring piece 16 has a recess 19 for locking a projecting part 18 of the leg 14, in a pressing surface for pressing the leg part 14. The leg 14 of a jamb can thereby be fixed to the base jack 12 and prevented from slipping off from the leg 14 even if lifted from the leg 14 of the jamb. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffold jack retaining structure, and more particularly to a scaffold jack retaining structure that is a basic part of a frame scaffold used at a construction site.

At construction sites, framework scaffolds are widely used for high-altitude work when constructing new buildings, dismantling or renovating buildings. The frame scaffold is composed of a plurality of building frames, cloth frames, main parts of braces, and the like, and a scaffolding jack as a foundation is provided at the bottom of these members.
The scaffolding jack includes a base plate that is placed on a horizontal plane, and a base jack that is provided on the base plate and includes a columnar column that has a male screw formed on the outer peripheral surface thereof. The scaffold jack has a substantially cylindrical rotating body that is screwed into the support column, and has a rotating body with a handle provided with a handle that protrudes in the horizontal direction from the rotating body.
The legs of the building frame (scaffolding pipes) are fitted into the base jack column. And a leg part is inserted until the front-end | tip (lower end) contact | abuts to the rotary body with a handle. Further, the rotating body with the handle has a structure that is screwed into a column of a base jack. With this scaffolding jack, the height of the leg can be adjusted even when the foundation is high or low.

In this case, the leg portion is in a state in which the leg portion is simply fitted and placed on the rotating body of the rotating body with the handle. That is, there is no stopper between the base jack and the leg. Therefore, when transporting in the horizontal direction or the like, there has been a problem that the base jack comes off from the leg pipe. Therefore, the trouble that the leg part of the building frame has to be fitted into the base jack again occurs.
In view of this, there has been disclosed a scaffolding jack that has been devised in various ways to solve this problem. For example, Patent Literature 1 discloses a base jack capable of preventing a leg from coming off. This document discloses a retainer composed of a flange member, a hook member, and a detachment preventing member.
JP-A-10-236784

However, the retainer described in Patent Document 1 requires the above three members and is very troublesome to attach and detach.
Further, if one of the three members is missing, it will not function as a retainer.
Furthermore, the above three members are structurally complex and are manufactured individually, which increases the cost of manufacturing them.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a retaining structure for a scaffolding jack that can prevent a leg from being detached from a base jack.
Another object of the present invention is to provide a retaining structure for a scaffolding jack that can be easily attached and detached.

  According to the first aspect of the present invention, there is provided a scaffolding jack retaining structure in which a rotating body with a handle is screwed into a base jack, and the leg of the building frame fitted in the base jack is retained. Protruding portions projecting outward are provided on the outer peripheral surface, and a retaining device for retaining the leg portion from the base jack is disposed by being externally fitted to the rotating body with the handle. The stopper includes a main body externally fitted to the rotating body with the handle, and a leaf spring piece protruding from the main body in the axial direction of the leg, and the leaf spring piece is interposed between the base jack and the base spring piece. Scaffolding jack in which a leg is pressed and sandwiched, and the leg is urged toward the outer peripheral surface of the base jack, and a depression that locks the protrusion is disposed on the pressing surface that presses the leg. Retaining It is a structure.

Examples of the base jack include a grooving jack, a large jack, and a bar jack.
The leg portion is a portion (such as a scaffold steel pipe) that becomes a leg portion of a building frame having a cylindrical shape. Examples of building frames include torii formwork and ladder formwork.
The shape of the protrusion provided on the leg is not limited. For example, an annular protrusion may be used, or a plurality of protrusions may be spaced apart in the circumferential direction of the leg. Alternatively, a screw may be fixed to the outer peripheral surface of the leg portion, and the protruding portion may be formed at the head of the screw.
Moreover, the formation method of the said protrusion part is not limited, either. For example, the annular protrusion can be formed by bead processing or bulge processing. Alternatively, an annular body having a circular, semi-circular or rectangular cross section may be provided as a protruding portion on a leg portion of a normal building frame, and may be provided by screwing or welding.

The shape of the leaf spring piece of the retainer is not limited. For example, the rotating body with the handle may protrude in a triangular shape along the axial direction of the base jack, or may have a substantially rectangular shape such as a strip shape.
A plurality of leaf spring pieces can be provided in the circumferential direction of the leg (scaffolding pipe). The number is not limited, and for example, two at 180 degree intervals or four at 90 degree intervals can be provided.
The leaf spring piece may be formed integrally with the main body, or may have a structure separated from the main body. For example, the leaf spring piece may be provided so as to be separated by screwing to the main body.
Further, the shape of the main body of the retainer is not limited. For example, it can have a cylindrical shape.
As the material of the stopper, it is preferable to use a synthetic resin that is easy to form and light. The synthetic resin may be a thermosetting resin or a thermoplastic resin. For example, acrylonitrile butadiene styrene resin (ABS resin) excellent in mechanical strength is used. Of course, it may be formed of a metal product.
Further, if the stopper is made of a synthetic resin, the strength can be easily adjusted.

  According to the first aspect of the present invention, the main body of the retainer is externally fitted to the rotating body with the handle of the scaffolding jack. Further, the retainer includes a leaf spring piece that protrudes from the main body. The leaf spring piece presses and sandwiches the leg portion with the base jack and urges the leg portion toward the outer peripheral surface of the base jack. And the recessed part which latches the protrusion part of the said leg part in the press surface which presses a leg part is formed in the leaf | plate spring piece. Thereby, the leg part of a building frame can be fixed to a base jack. Even if it is lifted from the leg of the building frame, it is possible to prevent the base jack from coming off from the leg. Moreover, if the urging | biasing of the leaf | plate spring of a leaf | plate spring piece is cancelled | released, the leg part of a building frame can be easily removed from a base jack. Moreover, since the retainer is not fixed to the rotating body with the handle by screwing or the like during mounting, the leg (pipe) is adjusted by screwing the rotating body with the handle into the base jack and adjusting the screwing height position. ) Height can be adjusted.

  A second aspect of the present invention is the scaffold jack retaining structure according to the first aspect, wherein the protruding portion is formed in an annular shape along the outer peripheral surface of the leg portion.

  According to a second aspect of the present invention, the projecting portion is formed in an annular shape along the outer peripheral surface of the leg portion (pipe). The annular protrusion can be easily formed by bead processing, bulge processing, or the like.

In the retainer according to the present invention, the main body is externally fitted to the rotating body with the handle of the scaffolding jack. At this time, the leaf spring piece protruding from the main body of the retaining member along the axial direction of the leg part presses the leg part toward the outer peripheral surface of the base jack. And the recessed part latched by the said protrusion part is formed in this press surface. Thereby, the protrusion part of the leg part of a building frame is latched by the recessed part of a leaf | plate spring piece, and is fixed between a leaf | plate spring and a base jack. Therefore, even if only the legs of the building frame are lifted up, the scaffolding jack does not come off from the legs.
Also, if the biasing of the leaf spring piece is released by biasing the leaf spring piece in a direction opposite to the biasing direction by some means, the leg of the building frame can be easily removed from the base jack. it can. In addition, when attaching to the scaffolding jack, the retainer is fixed only to the rotating body with the handle and not fixed to the base jack. Can be easily adjusted.

  Examples of the present invention will be specifically described below. 1 to 3 show a jack for a scaffold according to one embodiment of the present invention.

A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, a scaffold jack retaining structure 10 according to the present invention includes a metal base jack 12. The base jack 12 includes a substantially rectangular base plate 21 installed at a substantially horizontal location / position such as a floor surface at a construction site or the like.
In addition, a column 22 having a predetermined height and having a cylindrical shape and a male screw formed on the outer peripheral surface thereof is erected at the center portion on the base plate 21. Examples of the type of the base jack 12 include a grooving jack, a large jack, and a bar jack.

  The base jack 12 is provided with a rotating body 13 with a handle having a substantially cylindrical rotating body (boss portion) 26 having a predetermined height and a predetermined thickness. A female screw to be screwed into the support column 22 is formed on the inner peripheral surface of the rotating body 26 of the rotating body with handle 13. The rotating body 13 with a handle includes a pair of handles 23 that protrude from the rotating body 26 with a predetermined length on both sides in the horizontal direction. That is, the rotating body 13 with the handle is screwed into the column 22 of the base jack 12 by rotating the rotating body 26 with the handle 23.

Further, a cylindrical leg portion 14 (pipe), which is a pillar of a building frame, is fitted into the head (post 22) of the base jack 12. And the front-end | tip of the leg part 14 is inserted until it contact | abuts to the upper level | step-difference part 27 of the rotary body 26 of the said rotary body 13 with a handle | steering-wheel.
Here, the leg portion 14 of the building frame is a portion that becomes a leg of the building frame such as a torii type frame or a ladder type frame. And the front-end | tip (lower end) of the leg part 14 has a cylindrical shape.
A projecting portion 18 having a bulge on the outside is formed on the outer peripheral surface of the lower portion of the leg portion 14. As shown in FIG. 1, the protrusion 18 has a bulge formed in an annular shape. The annular protrusion 18 is formed by bead processing, press molding (bulge processing), or the like.

  And the cylindrical main body 15 of the retainer 11 which concerns on this invention is externally fitted by the said rotary body 13 with a handle. The stopper 11 is made of, for example, acrylonitrile butadiene styrene resin (ABS resin) having excellent mechanical strength. The retainer 11 has a substantially cylindrical main body 15. Further, the main body 15 is formed with semicircular cutouts 24 fitted on the handle 23 of the rotating body 13 with the handle on both sides of the main body 15.

  A claw 17 is provided at the lower part of the main body 15 so as to be hooked on the lower part of the rotating body 13 with a handle. The claw 17 has a substantially rectangular shape that protrudes from the lower portion of the main body 15 toward the column 22 of the base jack 12. A plurality of claws 17 are provided, and a notch 25 is provided between each claw 17. Thereby, the plurality of claws 17 are easily opened to the left and right.

Further, a leaf spring piece 16 that protrudes from the upper end of the main body 15 in the axial direction of the column 22 of the base jack 12 is provided. As shown in FIG. 3, four leaf spring pieces 16 are provided at intervals of 90 degrees. The leaf spring piece 16 has a predetermined width and a predetermined length and is formed in a substantially rectangular shape. The thickness of the leaf spring piece 16 is arbitrary.
The leaf spring piece 16 functions as a leaf spring that urges the leg portion 14 toward the outer peripheral surface of the column 22 of the base jack 12. In a state where the retainer 11 is mounted on the rotating body 13, the leaf spring piece 16 is in contact with the outer peripheral surface of the leg portion 14 when no external force is applied.
Further, a recess 19 for locking the annular protrusion 18 is provided on the pressing surface that presses the outer peripheral surface of the leg portion 14 of the leaf spring piece 16. The concave portion 19 has a half-pipe shape whose axis extends in the horizontal direction, and is disposed at a substantially central portion of the pressing surface of the leaf spring piece 16.

Next, the structure for retaining the scaffold jack according to the present application will be described.
First, a plurality of base jacks 12 are placed on the horizontal surface of the construction site. A rotating body 13 with a handle is screwed into a post 22 of the base jack 12 at a predetermined height position. Next, the main body 15 of the stopper 11 is inserted into the column 22 of the base jack 12. Then, the main body 15 is positioned on the rotating body 26 of the rotating body 13 with the handle.
And the nail | claw 17 of the retainer 11 is hooked on the lower part of the rotary body 26 of the rotary body 13 with a handle. Thereby, the main body 15 of the retainer 11 can be fitted to the rotating body 26 of the rotating body 13 with the handle.

Further, the leg portion 14 of the building frame such as a torii form frame is inserted into the column 22 of the base jack 12 until the tip (lower end) abuts the head of the rotating body 26 of the rotating body 13 with the handle. An annular protrusion 18 is formed on the outer peripheral surface of the leg portion 14. When the leg portion 14 is lowered, the protruding portion 18 comes into contact with the inner peripheral surface of the leaf spring piece 16 and opens (expands) the leaf spring piece 16 in the radial direction in the circular cross section of the leg portion 14.
Further, when the leg portion 14 is lowered, the protruding portion 18 of the leg portion 14 is fitted into the concave portion 19 of the leaf spring piece 16. Further, the leaf spring piece 16 presses and sandwiches the leg portion 14 between the leaf jack 16 and the outer peripheral surface of the support 22 of the base jack 12, and presses the leg 14 toward the outer periphery of the support 22 of the base jack 12. Energize.
By fitting and disposing the retainer 11 to the support 22 in this way, the leg portion 14 is sandwiched between the retainer 11 and the support 22 of the base jack 12 and firmly fixed and held. Can do. The retainer 11 is integrated with and engaged with the rotating body 13 with a handle. Therefore, as a whole, the stopper 11 is provided so as to be rotatable about its axis with respect to the column 22 of the base jack 12.
As a result, even if the building frame is lifted, the leg portion 14 does not come off from the column 22 of the base jack 12. Further, by changing the screwing position of the rotating body 13 with the handle to the support 22 of the rotating body 26, the height position of the lower end of the leg portion 14 can be adjusted with the retainer 11 attached to the rotating body 13 with the handle. Can be adjusted.

Next, when removing the scaffold, first, the leg portion 14 is lifted while stepping the leaf spring piece 16 in the radial direction of the leg portion 14 or pushing it open with a tool or the like. Then, the locking of the protrusion 18 to the recess 19 of the leaf spring piece 16 is released. Thereby, the leg part 14 can be extracted from the column 22 of the base jack 12. Thus, the retainer 11 according to the present invention can be removed from the rotating body 13 with the handle with a single touch.
Further, the retainer 11 according to the present invention can be attached to the rotating body 13 with a handle with one touch. Even when the scaffold is frequently moved at the construction site, the leg portion 14 does not fall off from the base jack 12.

It is a perspective view which shows the whole structure of the retaining structure of the jack for scaffolds concerning Example 1 of this invention. It is sectional drawing which shows the whole structure of the retaining structure of the jack for scaffolds concerning Example 1 of this invention. It is a top view which shows the cross section seen from the AA line of FIG.

Explanation of symbols

10 Scaffolding jack retaining structure,
11 Retaining tool,
12 Base jack,
13 Rotating body with handle,
14 legs,
15 body,
16 leaf spring pieces,
17 nails,
18 protrusions,
19 Recess.

Claims (2)

In the retaining structure of the jack for scaffolding, the rotating body with a handle is screwed into the base jack, and the leg of the building frame fitted in the base jack is retained.
On the outer peripheral surface of the leg portion, a protruding portion protruding outward is disposed, and
A stopper for preventing the leg from coming off from the base jack is provided by externally fitting the rotating body with the handle,
The retainer includes a body that is externally fitted to the rotating body with the handle,
A leaf spring piece protruding from the main body in the axial direction of the leg,
The leaf spring piece presses and sandwiches the leg portion with the base jack, urges the leg portion toward the outer peripheral surface of the base jack, and presses the leg portion against the pressing surface that presses the leg portion. A structure for preventing the jack of a scaffolding from being provided with a recess for locking the protrusion.   The scaffolding jack retaining structure according to claim 1, wherein the protruding portion is formed in an annular shape along the outer peripheral surface of the leg portion.

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