Wall ties

Abstract

The objective of the present invention is to improve the strength of wall ties, which are used as a means of connecting and supporting temporary scaffolding to the wall surface of a building when constructing temporary scaffolding on the outside of a building during construction or repair work on a building. [Solution] The wall tie of the present invention comprises an inner tube 5 having a small-diameter screw hole 4 at one end that is screwed into a screw shaft body 3 equipped with a pipe clamp 2, and an inner through hole 13 in the circumferential wall of the other end; an outer tube 6 having outer through holes 14a to 14c at appropriate intervals in the longitudinal direction in its circumferential wall; a mounting screw shaft 7 attached to the rear end of the outer tube 6; and a connecting pin 8. A connecting pin support 9 is provided to support the connecting pin 8 so that it can be inserted and removed between a position where it is pulled out to the outside of the outer tube 6 and an operating position where it is inserted through the inner through hole 13 of the inner tube 5 and the outer through holes 14a... of the outer tube 6. This connecting pin support 9 is supported by a support member 20 that is fixed in a position so that it cannot be rotated relative to the inner tube 5 or moved in the axial direction.

Description

Technical Field

[0001] The present invention relates to an article called a wall connector, which is used to connect and support a temporary scaffold to the wall surface of a building when constructing a temporary scaffold outside the building during building construction or repair work.

Background Art

[0002] As shown in FIGS. 1 and 2 of Patent Document 1, a general structure of an article called a wall connector includes a screw shaft body provided with a pipe clamp at an outer end, an inner pipe that fits over the screw shaft body and has a small-diameter screw hole portion at a tip that is screwed onto the screw shaft body, an outer pipe that fits over the inner pipe in a lengthwise insertable and removable manner, a mounting screw shaft attached to a rear end portion of the outer pipe that protrudes from an inner end of the inner pipe, and a connecting pin that connects the outer pipe to the inner pipe at a plurality of axially insertable and removable positions. In the configuration of the wall connector shown in this Patent Document 1, the connecting pin is supported in the inner pipe so as to be radially retractable and is configured to fit into a radially penetrating hole provided in the outer pipe by a spring. When inserting and removing the outer pipe with respect to the inner pipe to adjust the total length of this inner and outer double pipe, the connecting pin whose tip is inserted into the through hole of the outer pipe is pushed into the inner pipe with a fingertip against the biasing force of the spring from the outside of the outer pipe, and the connecting pin is disengaged from the through hole of the outer pipe to the inside, making it possible to insert and remove the outer pipe with respect to the inner pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the wall tie configuration shown in Patent Document 1, the connecting pin is housed inside the inner tube together with the spring. As a result, the connecting pin is thin and very short, and when a large axial external force (tensile or compressive force) acts between the inner and outer tubes, it becomes structurally unsustainable, leading to damage to the connecting pin and the through-hole supporting it. [Means for solving the problem]

[0005] The present invention proposes a wall tie that can solve the conventional problems described above. To facilitate understanding of the relationship with the embodiments described later, the wall tie according to the present invention is shown with reference numerals in parentheses, as used in the description of the embodiments: a screw shaft body (3) with a pipe clamp (2) at its outer end; an inner tube (5) that fits onto the screw shaft body (3) and has a small diameter screw hole (4) at its outer end that screws onto the screw shaft body (3); an outer tube (6) that fits onto the inner tube (5) so as to be able to move in and out in the longitudinal direction; a mounting screw shaft (7) attached to the rear end of the outer tube (6) that protrudes from the inner end of the inner tube (5); and an inner through hole (13) and outer tube provided in the inner tube (5). In a wall tie (1) equipped with a connecting pin (8) that can be moved in and out across a selected outer through hole (14a~14c) provided at multiple axial locations of (6), a connecting pin support (9) is provided to support the connecting pin (8) so that it can be moved in and out between a position where the entire length of the connecting pin (8) is pulled out to the outside of the outer tube (6) and an operating position where it is inserted across the concentrically arranged inner through holes (13) and outer through holes (14a...). The connecting pin support (9) is supported by a support member (20) that is fixed in position at the tip of the inner tube (5) protruding from the outer tube (6) so that it cannot rotate relative to the inner tube (5) or move in the axial direction. [Effects of the Invention]

[0006] The wall tie of the present invention, with the above configuration, can be used to support a temporary scaffold on a building wall by performing the following operations in any order: attaching the wall tie to the building by screwing the mounting screw shaft at the rear end of the outer tube into a screw hole provided in the wall surface of the building; pulling out the connecting pin to the pull-out position and moving the outer tube in and out of the inner tube in the longitudinal direction to position the outer through hole at any position in the longitudinal direction of the outer tube concentrically with respect to the inner through hole of the inner tube, inserting the connecting pin from the pull-out position to the working position to prevent the outer tube from moving in the longitudinal direction relative to the inner tube, thereby changing the overall length of the inner and outer double tubes; adjusting the length of the protrusion of the screw shaft relative to the inner and outer double tubes (the distance between the inner and outer double tubes and the pipe clamp) by rotating the screw shaft body equipped with a pipe clamp in any direction relative to the inner tube and adjusting the screw shaft body in and out of the small diameter screw hole at the tip of the inner tube; and connecting the pipe clamp to the temporary scaffold to be supported on the wall surface of the building at an appropriate height so that the entire wall tie is in a nearly horizontal position.

[0007] As described above, the configuration of the wall tie of the present invention allows for the installation of temporary scaffolding while freely and efficiently adjusting the distance between the building wall and the temporary scaffolding by adjusting the length of the inner and outer double pipes in multiple stages and by continuously fine-tuning the length using a screw shaft, similar to conventionally known methods. However, since the connecting pin is supported by the connecting pin support at the position where it is pulled out from the inner and outer double pipe, there is no need to hold the connecting pin by hand after it has been pulled out from the inner and outer double pipe. Moreover, the connecting pin supported at the position where it is pulled out is always supported by the connecting pin support and the support member in a direction and position concentric with the axis of the inner through-hole of the inner pipe into which the connecting pin is inserted, regardless of whether the total length of the inner and outer double pipes increases or decreases. When inserting the connecting pin after adjusting the length of the inner and outer double pipes, it is only necessary to confirm that the outer through-hole of the outer pipe is located opposite the tip of the connecting pin at the position where it is pulled out, making the adjustment of the total length of the inner and outer double pipes extremely simple, easy, and efficient.

[0008] In implementing the present invention as described above, specifically, the inner through-holes (13) and outer through-holes (14a~14c) are provided concentrically on both circumferential walls in the diametrical direction of the inner tube (5) and outer tube (6), respectively, and the connecting pin (8) is longer than the diameter of the outer tube (6) and, when in the operating position, can be configured to penetrate a total of four concentrically located inner through-holes (13) and outer through-holes (14a...). With this configuration, compared to the case where the inner and outer through-holes are provided only on one side of the axial position of the inner and outer tubes, and the connecting pin penetrates each through-hole only on one side of the axial center of the inner and outer double tubes, external forces acting in the direction of extension or contraction of the inner and outer double tubes can be received by the connecting pin at two locations on both sides of the axial center of the inner and outer double tubes, thereby suppressing the situation in which the connecting pin or the through-holes of the inner and outer double tubes are damaged when a large external force acts on this wall connection.

[0009] Furthermore, an auxiliary pin (8b) may be provided on the end of the connecting pin (8) on the side facing the pulling direction to the pulling position, running parallel to the connecting pin (8) and located outside the outer tube (6). The tip of this auxiliary pin (8b) is provided with a stopper (16) that prevents the connecting pin (8) from being pulled out beyond the pulling position by contacting the connecting pin support (9). The tip of the connecting pin (8) may also be provided with an elastic stopper (15) that retracts against elastic force when passing through the through holes (13, 14a…) of the inner tube (5) and outer tube (6), but protrudes due to elastic force when protruding from the through holes (13, 14a…). This configuration simplifies the construction of the connecting pin support and allows for lower costs compared to a configuration where a single connecting pin can only be moved between a position where its entire length is pulled out to the outside of the outer tube and an operating position where it is passed through four concentrically arranged through holes. Furthermore, the large portion connecting the connecting pin and the auxiliary pin can be used as a gripping part necessary when inserting or removing the connecting pin.

[0010] Furthermore, the support member (20) can be provided with a pin-shaped projection (24) whose tip fits into an opening (11) provided in the portion of the inner tube (5) that protrudes from the outer tube (6), as well as a pair of left and right rising plate portions (21a, 21b) that sandwich the small-diameter screw hole portion (4) at the tip of the inner tube (5), and a fastening bolt (22) that tightens the pair of left and right rising plate portions (21a, 21b) to clamp and fix the small-diameter screw hole portion (4) at the tip of the inner tube (5). This configuration makes it easy to implement a structure in which the support member that supports the connecting pin support is fixed in a position that prevents relative rotation and axial movement with respect to the inner tube. Moreover, the opening into which the pin-shaped projection fits can utilize one of the auxiliary through-holes for assembly provided on both sides of the inner tube in the diametrical direction, that is, the auxiliary through-holes for assembly that are used to form a retaining crimp on the surface near the inner end of the screw shaft that is screwed into the inner tube from the outside into the small-diameter screw hole at the tip of the inner tube. This makes it possible to implement the structure inexpensively. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1A is a plan view of a wall tie according to one embodiment of the present invention, and Figure 1B is a side view of the same wall tie. [Figure 2] Figure 2 is a partial cross-sectional plan view of the wall tie shown above. [Figure 3] Figure 3 is a partial longitudinal cross-sectional side view of the wall tie shown above. [Figure 4] Figure 4 is an enlarged rear view of the wall tie shown above, taken from the side of the mounting screw shaft. [Figure 5] Figure 5 is an enlarged cross-sectional view of line AA in Figure 1B. [Figure 6] Figure 6A is an enlarged cross-sectional view of line BB in Figure 1B, and Figure 6B is an enlarged side view of the connecting pin. [Figure 7] Figure 7 is a longitudinal cross-sectional side view of the double-pipe section of the wall tie shown above, extended to its maximum extent. [Figure 8] Figure 8 is a perspective view showing the connecting pin support and its support member for the wall tie shown above. [Figure 9]Figure 9 is a side view showing a typical use case of a wall tie. [Figure 10] Figure 10 is a partial longitudinal cross-sectional side view showing another embodiment of the present invention. [Figure 11] Figure 11 is an enlarged longitudinal cross-sectional view showing the connecting pin and its support, as well as the inner and outer double tube, as shown in Figure 10. [Modes for carrying out the invention]

[0012] A preferred embodiment of the present invention will be described below with reference to Figures 1 to 8 of the attached diagrams. The wall tie 1 comprises a screw shaft body 3 with a pipe clamp 2 at its outer end, an inner tube 5 having a small-diameter screw hole 4 at its outer end that is screwed into the screw shaft body 3, an outer tube 6 that is fitted onto the inner tube 5 so as to be able to move in and out in the longitudinal direction, a mounting screw shaft 7 attached to the outer end of the outer tube 6 that protrudes from the inner end of the inner tube 5, a connecting pin 8 that connects the outer tube 6 to the inner tube 5 at multiple axial insertion and removal positions, and a connecting pin support 9 that supports the connecting pin 8. The pipe clamp 2 is a conventionally known type and consists of an L-shaped base member 2a, a pressing member 2c pivotally supported by a support shaft 2b at the rising end of the L-shaped base member 2a so as to be able to open and close, and a bolt 2e pivotally supported by a support shaft 2d at the horizontal end of the L-shaped base member 2a so as to be able to swing, and a fastening nut 2f that is screwed onto this bolt 2e. With the pipe material gripped between the L-shaped base member 2a and the pressing member 2c, the bolt 2e is closed and fitted into the bifurcated tip of the pressing member 2c, and in this state, the fastening nut 2f is tightened to press the pressing member 2c toward the L-shaped base member 2a, thereby clamping and fixing the gripped pipe material between the L-shaped base member 2a and the pressing member 2c.

[0013] The outer end of the screw shaft 3 is connected to the L-shaped base member 2a of the pipe clamp 2 so as to be rotatable relative to the axis of the screw shaft 3. Specifically, a cylindrical shaft portion 10, which is larger in diameter than the screw shaft 3 and has a large-diameter retaining portion 10a at its outer end, is concentrically attached to the outer end of the screw shaft 3. The cylindrical shaft portion 10 is supported when it penetrates the bottom plate of the L-shaped base member 2a of the pipe clamp 2 by a pair of retaining protrusions 10b and the large-diameter retaining portion 10a, which are post-processed to protrude from both circumferential surfaces in the diametrical direction of the cylindrical shaft portion 10. The cylindrical shaft portion 10 is provided with a through-hole 10c that penetrates in the diametrical direction and can be used when rotating the screw shaft 3 relative to the pipe clamp 2. The screw shaft 3 is screwed through the small-diameter screw hole 4 at the tip of the inner tube 5 and integrated with the inner tube 5. However, to prevent the screw shaft 3 from coming loose from the inner tube 5 due to unscrewing, retaining crimping portions 3a are stamped onto the circumferential surface (screw shaft portion) near the inner end of the screw shaft 3 on both sides (or one side) in the diametrical direction. To stamp these retaining crimping portions 3a, crimping operation openings 11 are provided on both diametrically circumferential walls of the inner tube 5 near the small-diameter screw hole 4 at the tip.

[0014] At the rear end of the shaft body, which has a mounting screw shaft 7 formed at its tip, a hemispherical bulge head 7a is integrally formed, having a maximum diameter slightly smaller than the inner diameter of the outer tube 6. The outer end of the outer tube 6 has a hemispherical constricted portion 6a that receives the hemispherical bulge head 7a of the mounting screw shaft 7, and a flattened shaft portion 7b is formed between this hemispherical bulge head 7a and the mounting screw shaft 7 for rotating the mounting screw shaft 7 on the outside of the outer tube 6. Furthermore, at the outer end of the outer tube 6, after the mounting screw shaft 7 is attached to the hemispherical tapered portion 6a of the outer tube 6 as described above, a bolt and nut 12 is attached by passing through in the diametrical direction adjacent to the flat end face of the hemispherical bulge head 7a of the mounting screw shaft 7. A pair of protrusions 7c are provided on the flat end face of the hemispherical bulge head 7a to sandwich the bolt shaft portion of the bolt and nut 12, thereby restricting the mounting screw shaft 7 from rotating around its axis relative to the outer tube 6.

[0015] At the inner end of the inner tube 5, inner through-holes 13 for inserting the connecting pin 8 are provided on both circumferential walls in the diameter direction. As shown in FIGS. 2 and 3, when the outer tube 6 is externally fitted to the inner tube 5 from its inner end opening to the maximum depth where the inner end of the inner tube 5 abuts against the bolt nut 12, the tip of the outer tube 6 reaches a position overlapping a part of the caulking operation opening 11 provided in the inner tube 5, or a position immediately before reaching the caulking operation opening 11. The length of the outer tube 6 in this state is such that it reaches a position where it does not overlap the caulking operation opening 11. At appropriate intervals (a total of 3 locations in the illustrated example) in the diameter direction from the portion where the outer tube 6 overlaps concentrically with the inner through-hole 13 of the inner tube 5 to the tip of the outer tube 6, outer through-holes 14a to 14c penetrating in the diameter direction are provided.

[0016] The connecting pin 8 is inserted into any one of the outer through-holes 14a to 14c of the outer tube 6 and the inner through-hole 13 of the inner tube 5. As shown in FIG. 6, an elastic stopper 15 is installed in the vicinity of the tip of the connecting pin 8. The elastic stopper 15 is formed by inserting a coil spring 15a and a sphere 15b into a cylindrical recessed hole formed in the diameter direction from the circumferential surface of the connecting pin 8 to a required depth, and constricting the periphery of the opening end of the cylindrical recessed hole so that only a part of the sphere 15b protrudes by the pressing force of the coil spring 15a. However, it is not limited to this structure. At the other end of the connecting pin 8, a grip portion 8a formed by bending a cylindrical shaft body forming the connecting pin into a circular shape and an auxiliary pin 8b formed by arranging a cylindrical shaft body extending from the grip portion 8a in parallel with the connecting pin 8 are continuously provided. The tip of the auxiliary pin 8b reaches the same position as the tip of the connecting pin 8, and a stopper 16 is attached to the tip of the auxiliary pin 8b. The stopper 16 is formed by a rivet pin penetrating the tip of the auxiliary pin 8b in the diameter direction, but other structures may also be used.

[0017] As shown in FIGS. 3, 7, and 8, the connecting pin support 9 is composed of a flat plate member 18 provided with two pin support holes 17, 17a through which the connecting pin 8 and the auxiliary pin 8b penetrate. This flat plate member 18 is connected to the wide end portion of a support member 20 formed of a tapered flat plate that is parallel to the outer tube 6 on the side opposite to the side where the flat plate member 18 is located with respect to the outer tube 6 through a pair of left and right leg plate portions 19a, 19b integrally connected to sandwich the outer tube 6 from the flat plate member 18. At the tapered end portion of this support member 20, a pair of left and right rising plate portions 21a, 21b that sandwich the tip small-diameter threaded hole portion 4 of the inner tube 5 are integrally connected, and a fastening bolt 22 is provided for clamping and fixing the tip small-diameter threaded hole portion 4 of the inner tube 5 by clamping the upper ends of the pair of left and right rising plate portions 21a, 21b.

[0018] Between a pair of left and right vertical plate portions 19a, 19b that support the connecting pin support 9 configured as described above, the inner tube 5 and the outer tube 6 externally fitted to the inner tube 5 are inserted from the side where the mounting screw shaft 7 is located, and the tip small-diameter threaded hole portion 4 of the inner tube 5 is fitted between a pair of left and right rising plate portions 21a, 21b of the support member 20. By fastening the upper end portions of the pair of left and right rising plate portions 21a, 21b to each other with the fastening bolt 22 to clamp and fix the tip small-diameter threaded hole portion 4 of the inner tube 5, the connecting pin support 9 is attached to the inner tube 5 via the support member 20. At this time, as shown in the figure, a through-hole 23 is provided in the support member 20 as shown in FIG. 3 so as to be located directly below the caulking operation opening 11 of the inner tube 5. A pin-shaped projection 24 is formed by a bolt screwed into the through-hole 23 from the outside of the support member 20, and by fitting the tip end portion of the pin-shaped projection 24 into the caulking operation opening 11 of the inner tube 5, even if the fastening bolt 22 that clamps and fixes the tip small-diameter threaded hole portion 4 of the inner tube 5 loosens, there is no risk that the connecting pin support 9 (flat plate member 18) will rotate around the inner tube 5. In addition, the peripheral edge portion 6b at the tip on the side opposite to the side where the mounting screw shaft 7 of the outer tube 6 is located is enlarged in diameter so that the outer diameter cannot pass between a pair of left and right leg plate portions 19a, 19b that support the connecting pin support 9. With this configuration, even when the connecting pin 8 is pulled out, there is no risk that the outer tube 6 will separate from the inner tube 5.

[0019] As described above, when the connecting pin support 9 is attached to the inner tube 5, the pin support hole 17 through which the connecting pin 8 is inserted is located directly above the axis of the outer tube 6 and concentrically with the inner through hole 13 of the inner tube 5, while the other pin support hole 17a protrudes to one side of the outer tube 6 in a plan view. On the other hand, when the outer tube 6 fitted onto the inner tube 5 is placed over the inner tube 5 to the limit position where the inner end of the inner tube 5 is adjacent to the bolt and nut 12 that position the mounting screw shaft 7 of the outer tube 6, the outer through hole 14a located at the end on the mounting screw shaft 7 side of the outer tube 6 and the inner through hole 13 of the inner tube 5 are located at approximately the same position in the axial direction. In this state, the outer tube 6 can be rotated to position the outer through hole 14a concentrically with the inner through hole 13 of the inner tube 5. Next, the connecting pin 8 and the auxiliary pin 8b are inserted from above into the two pin support holes 17, 17a in the flat plate member 18 of the connecting pin support 9, before the stopper (rivet pin) 16 at the tip of the auxiliary pin 8b is attached. At this time, the elastic stopper 15 at the lower end of the connecting pin 8 temporarily retracts against the elastic force of the coil spring 15a as its sphere 15b passes through the outer through hole 14c of the outer tube 6 and the inner through hole 13 of the inner tube 5. On the other hand, the stopper (rivet pin) 16 is attached to the lower end of the auxiliary pin 8b after it passes downward through the pin support hole 17a of the flat plate member 18.

[0020] The assembly of the wall tie 1 is now complete. As shown in Figure 9, the assembled wall tie 1 is used as a means to connect the temporary scaffolding 26 to the existing building 25 when a temporary scaffolding 26 for work is installed on the outside of the existing building 25. The temporary scaffolding 26 is assembled by connecting gate-shaped members 27 that are connected and integrated with each other in the required number of stages in the vertical direction, and by connecting the gate-shaped members 27 that are arranged horizontally with horizontal connecting pipes. Each gate-shaped member 27 consists of a pair of left and right leg column pipes 27a, 27b and an upper horizontal pipe 27c that connects the upper ends of the left and right pair of leg column pipes 27a, 27b. Scaffolding boards (not shown) supported between the upper horizontal pipes 27c of the gate-shaped members 27 at the same height are used as a walking and working surface for workers. The wall tie 1 is connected by screwing its mounting screw shaft 7 at one end into a pre-installed screw hole (such as a long nut for anchors embedded in the wall surface 25a) at a predetermined position on the wall surface 25a of the existing building 25, and gripping and fastening its other end pipe clamp 2 to the leg column pipe material 27a of the gate-shaped member 27 located on the wall surface 25a side. When using the wall tie 1 in this manner, the total length L of the wall tie 1 (the total length between the mounting screw shaft 7 at one end and the pipe clamp 2 at the other end), as shown in Figure 3, must be adjusted to correspond to the horizontal distance between the wall surface 25a of the existing building 25 and the leg column pipe material 27a of the temporary scaffolding 26 that grips the pipe clamp 2.

[0021] As shown in Figure 3, the total length L of the wall tie 1 is the distance D1 from the tip of the small-diameter screw hole 4 at the end of the inner tube 5 to the inner end of the screw shaft portion of the mounting screw shaft 7 protruding from the outer tube 6 (hereinafter abbreviated as the total length of the inner and outer double tube 28 consisting of the inner tube 5 and outer tube 6 that fit together) plus the distance D2 from the tip of the inner tube 5 to the pipe clamp 2. In Figure 3, the connecting pin 8 penetrates in the diametrical direction through the outer through hole 14a on the inner end side, which is the closest to the mounting screw shaft 7 among the three outer through holes 14a to 14c in the axial direction of the outer tube 6, and the inner through hole 13 of the inner tube 5, so the total length D1 of the inner and outer double tube 28 is minimized. Furthermore, as shown in Figure 7, by passing the connecting pin 8 diametrically through the outer through hole 14c, which is the outermost outer through hole located furthest from the mounting screw shaft 7 among the three outer through holes 14a to 14c in the axial direction of the outer tube 6, and the inner through hole 13 of the inner tube 5, the total length D1 of the inner and outer double tube 28 can be made to a maximum length that is longer than the minimum length shown in Figure 3 by the distance d2 from the outer through hole 14a to the outer through hole 14c. Similarly, if the connecting pin 8 is passed diametrically through the outer through hole 14b and the inner through hole 13 at the middle position of the outer tube 6, the total length D1 of the inner and outer double tube 28 will be longer than the minimum length shown in Figure 3 by the distance d1 from the outer through hole 14a to the outer through hole 14b. Thus, the total length D1 of the inner and outer double tubes 28 can be adjusted in three stages, but in any length used, the total length L of the wall connector 1 can be finely adjusted by adjusting the distance D2 by screwing the screw shaft 3 into and out of the inner tube 5.

[0022] As described above, when adjusting the total length D1 of the inner and outer double pipe 28 in three stages, when the connecting pin 8 is pulled up towards the flat plate member 18 of the connecting pin support 9 and the connecting pin 8 is pulled upward from the outer through holes 14a to 14c of the outer pipe 6, the stopper 16 at the tip of the auxiliary pin 8b, which is pulled up together with the connecting pin 8, comes into contact with the flat plate member 18 of the connecting pin support 9, preventing further pulling out of the connecting pin 8. Therefore, there is no risk of the connecting pin 8 and the auxiliary pin 8b coming out upward from the pin support holes 17, 17a of the flat plate member 18 and detaching from the wall tie 1. Furthermore, when the connecting pin 8 is withdrawn from the inner and outer double tube 28, the outer tube 6 can freely rotate relative to the inner tube 5 around its axis. Therefore, when fixing the length of the inner and outer double tube 28 with the connecting pin 8 after length adjustment, the outer tube 6 should be rotated relative to the inner tube 5 around its axis so that a selected outer through-hole from the outer through-holes 14a to 14c of the outer tube 6 is positioned concentrically with the connecting pin 8.

[0023] With the connecting pin 8 withdrawn from the inner and outer double tube 28, the outer tube 6 can move freely in the axial direction relative to the inner tube 5, but the enlarged peripheral edge 6b of the outer tube 6 cannot pass between the pair of left and right leg plates 19a, 19b of the connecting pin support 9, so there is no risk of the outer tube 6 falling out of the inner tube 5. Of course, if the relative axial movement of the inner and outer double tube 28 is limited to a range where the outer tube 6 does not fall out of the inner tube 5, and relative rotation of the outer tube 6 with respect to the inner tube 5 is also prevented, for example, It is also possible to provide a guide slit parallel to the axial direction of the inner tube 5 between either of the inner through holes 13 on both sides in the diametrical direction and the crimping operation openings 11 on both sides in the diametrical direction, and to provide a pin (such as a bolt) projecting radially from the outer end of the outer tube 6 (between the outer through hole 14c and the outer end of the outer tube 6) into which the tip of the guide slit fits.

[0024] Furthermore, when the connecting pin 8 is passed through a total of four through holes (two outer through holes in the diametrical direction and two inner through holes 13 in the diametrical direction among the outer through holes 14a to 14c) located concentrically in the inner and outer double tubes 28, the spherical 15b of the elastic stopper 15 at the tip of the connecting pin 8 protrudes due to the elastic force of the built-in coil spring 15a. Therefore, even if the tip of the connecting pin 8 is facing upward, there is no risk that the connecting pin 8 and the auxiliary pin 8b will move in the pulling direction due to gravity, causing the connecting pin 8 to detach from the inner and outer double tubes 28 and preventing the inner and outer double tubes 28 from maintaining their adjusted length.

[0025] The illustrated embodiment described above is just one example and is not the only one that is applicable. Another modified embodiment will be described based on Figures 10 and 11. In this modified embodiment, the through holes 13, 14a to 14c provided in the inner tube 5 and outer tube 6 are provided only on one side of the axis of the inner tube 5 and outer tube 6 (the side with the connecting pin support 9), and a short connecting pin 8 is used whose tip remains inside the inner tube 5 when in operation. The auxiliary pin 8b is also made short to match the short connecting pin 8. In this configuration as well, the connecting pin 8 can be made using a thick rod-shaped material that is sufficiently strong compared to the conventional structure in which it is housed inside the inner tube 5, and the connecting pin 8 can also be supported by the connecting pin support 9 on the outside of the inner and outer double tube 28, so there is not much of a problem in terms of strength. [Industrial applicability]

[0026] The wall tie according to the present invention can be used in construction and repair work of buildings as a means of connecting and supporting temporary scaffolding to the wall surface of a building when constructing temporary scaffolding on the outside of a building. [Explanation of symbols]

[0027] 1 Wall ties 2 Pipe clamps 2a L-shaped base member 2b,2d Support shaft 2c Retaining member 2e bolt 2f Fastening nut 3. Helical shaft 3a Crimping part to prevent detachment 4. Small diameter screw hole at the tip 5 Inner tube 6 outer tube 6a Hemispherical drawing section 6b Enlarged peripheral edge 7. Mounting screw shaft 7a Hemispherical bulging head 7b Flat shaft part 7c A pair of protrusions 8 connecting pins 8a Thumb part 8b Auxiliary pin 9. Connecting pin holder 10. Cylindrical shaft 10a Large diameter section for preventing detachment 10b A pair of retaining protrusions 10c Through hole for rotational operation 11. Opening for crimping operation 12 bolts and nuts 13 Inner through hole 14a~14c Outer through hole 15 Elastic stopper 15a Coil spring 15b Sphere 16. Stopper (rivet pin) 17,17a Pin support holes 18 Flat plate member 19a, 19b A pair of left and right leg plates 20 Support members 21a, 21b Left and right pair of rising plate sections 22 Fastening bolts 23 Through screw holes 24 Pin-shaped projection (bolt) 25 Existing buildings 25a Wall surface 26 Temporary scaffolding 27 Gate-shaped member 27a, 27b Leg column pipe material 27c Upper horizontal pipe material 28 Double-walled tube (inner and outer)

Claims

1. A wall tie comprising a screw shaft body with a pipe clamp at its outer end, an inner tube fitted onto the screw shaft body and having a small-diameter screw hole at its outer end that screws onto the screw shaft body, an outer tube fitted onto the inner tube so as to be able to move in and out in the longitudinal direction, a mounting screw shaft attached to the rear end of the outer tube that protrudes from the inner end of the inner tube, and a connecting pin that can be moved in and out across an inner through hole provided in the inner tube and a selected outer through hole from among a plurality of outer through holes provided at axial locations of the outer tube, wherein a connecting pin support is provided to support the connecting pin so as to be able to move it in and out between a position where the entire length of the connecting pin is pulled out to the outside of the outer tube and an operating position where it is inserted across the concentrically arranged inner through hole and outer through hole, and this connecting pin support is supported by a support member that is fixed in position at the tip of the inner tube that protrudes from the outer tube so as to be unable to rotate relative to the inner tube or move in the axial direction.

2. The wall tie according to claim 1, wherein the inner and outer through-holes are provided concentrically on both circumferential walls in the diametrical direction of the inner and outer tubes, respectively, and the connecting pin is longer than the diameter of the outer tube and, when in the operating position, is configured to penetrate a total of four concentrically located inner and outer through-holes.

3. The wall tie according to claim 1 or 2, wherein the connecting pin is connected to an auxiliary pin which is connected to the end on the side in the direction of withdrawal to the withdrawal position, is parallel to the connecting pin and is located on the outside of the outer tube, the tip of the auxiliary pin is provided with a stopper which prevents the connecting pin from being withdrawn beyond the withdrawal position by contacting the connecting pin support, and the tip of the connecting pin is provided with an elastic stopper which retracts against elastic force when passing through the through holes of the inner tube and outer tube, but protrudes due to elastic force when protruding from the through hole of the outer tube.

4. The wall tie according to any one of claims 1 to 3, wherein the support member is provided with a pin-shaped projection whose tip fits into an opening provided in the portion of the inner tube that protrudes from the outer tube, and is provided with a pair of left and right rising plates that sandwich the small-diameter screw hole at the tip of the inner tube, and fastening bolts that tighten the pair of left and right rising plates to clamp and fix the small-diameter screw hole at the tip of the inner tube.

Images