JPH0122968Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a spread-leg nail used for aerated concrete, soft materials, etc.

[Conventional technology]

Spread nails used in aerated concrete are
The purpose is to open the legs at the same time as pouring to improve pull-out strength. However, if the legs open at the same time as pouring starts, compression of the aerated concrete between the legs will not occur, and sufficient pull-out strength will not be achieved. You won't get it.

For this reason, the applicant has developed a split-leg nail in which the legs are not opened in the first half of the driving process, but are opened in the second half to trap and compress the aerated concrete between the legs, thereby improving the pull-out strength. This was already proposed in Utility Model Publication No. 53-20609.

The above-mentioned split-leg nail has an axial slit in the leg of the nail body, a split-leg member is attached to the leg, and a resistance part is provided at the end of the spread-leg member, so that the resistance part is covered during driving. When the leg spread member comes into contact with a fixed object, the tip of the leg portion is opened by subsequent driving.

[Problem that the invention attempts to solve]

By the way, in the structure in which the above-mentioned splitting members are attached to the legs, the splitting members may rise in the axial direction under pressure from the aerated concrete at the same time as the driving starts, and splitting may occur quickly.

This invention was made in view of the above-mentioned points, and the purpose is to provide a split-leg nail in which the split-leg nail occurs accurately after a predetermined amount of driving.

[Means for solving problems]

In order to solve the above problems, this device has legs that are divided into multiple parts by slits provided along the axial direction from the tip, and an inclined surface that widens at the tip is formed on the inner surface of the tip side of both legs. A washer is formed separately from the washer and is fitted between the inclined surfaces. A wedge member is formed by providing a plate-shaped body on the upper end of the wedge body to be inserted into the tip side of the slit, and a breakable part that receives the fitting part of the washer is provided in the slit of the leg, and the breakable part is located approximately in the middle of the leg in the axial direction, and the wedge member is arranged such that the upper end of the plate-like member hits the breakable part via the fitting part with the wedge body aligned between the inclined surfaces at the tip of the leg. The wedge body has a structure in which a fitting portion consisting of a recess and a protrusion is provided along the length direction of the leg on the overlapping surface of the wedge body and the inclined surface of the leg. be.

[Effect]

When the legs are driven into cellular concrete, the wedge members are prevented from moving toward the rear end of the legs by the breakable portion, so the legs do not open during the first half of the driving.

If the washer contacts the object and is driven further, the fitted part of the washer will break the breakable part, and when the leg enters the stopped washer, the wedge member will break into the aerated concrete that is received at the tip. Due to the pressure of
The aerated concrete is trapped between the legs in a compressed state.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, the split leg nail of this invention has a nail body 1
The nail body 1 consists of a head part 4 and a leg part 5, and the leg part 5 has a slit 6 provided along the axial direction from its tip to a pair of leg pieces 5a. , 5a, both leg pieces 5a,
At the tip of 5a, sloped surfaces 7, 7 are provided on the slit side surface to widen the tip.

The washer 2 is formed by providing external fitting holes 8, 8 for the leg pieces 5a, 5a in the center, and providing a fitting part 9 that fits into the slit 6 between both the external fitting holes 8, 8.
It is mounted so that it can move freely in the axial direction.

The wedge member 3 includes a triangular wedge body 10 that fits between the inclined surfaces 7, 7 of the leg pieces 5a, 5a,
The wedge body 10 extends upward from the upper end thereof and is formed by a plate-like body 11 having a thickness that fits into the slit 6.

Note that the wedge member 3 inserted into the tip side of the leg portion 5
In order to ensure stable setting in the radial direction of the leg portion 5, a fitting consisting of a recess and a protrusion is provided on the contact surface between the leg pieces 5a, 5a and the wedge member 3, that is, on the surface where the inclined surfaces 7, 7 and the wedge body 10 overlap. portions are provided along the length of the leg portion 5.

A breakable part 12 is provided in the slit 6 in the middle of the leg part 5 of the nail body 1, and the movement of the washer 2 inserted into the leg part 5 toward the head part 4 is prevented by the contact of the fitting part 9. It's becoming more and more of a deterrent.

Furthermore, when the wedge member 3 is inserted into the tip of the leg 5 and the tip end surface of the wedge body 10 is aligned with the tip of the leg 5, the plate-shaped body 11 is inserted as shown in FIG.
The end portion thereof is formed in such a length that it abuts on the breakable portion 12 via the fitting portion 9 .

The destructible part 12 can withstand the pushing force of the leg part 5 backwards applied to the wedge member 3 when the leg part 5 is placed into the aerated concrete A, and the washer 2 is
The fitting part 9 is formed to have such strength that it will be destroyed by the driving force after it comes into contact with the fitting part 9.

This breakable part 12 is made of the metal that forms the nail body 1, and is integrally molded with the leg pieces 5a, 5a, and a shaft-shaped object made of metal or synthetic resin is inserted into a radial horizontal hole provided in the leg body 5. It may be formed by

The split leg nail of this invention has the above structure,
With the washer 2 and wedge member 3 set on the nail body 1, insert the aerated concrete A through the pilot hole of the object B.
When the wedge member 3 is driven in, as shown in FIGS.
Since the washer 2 is supported by the breakable part 12 through
Until the leg pieces 5a, 5 come into contact with the fixed object B,
A enters without opening its legs, and the aerated concrete A is sufficiently compressed at the tips of the legs 5.

When the washer 2 is driven further after it comes into contact with the fixed object B, the breakable part 12 is broken at the fitted part 9 of the washer 2 which has stopped, and the wedge member 3 is broken by the pressure applied by the aerated concrete A. Only the leg pieces 5a, 5a will enter while stopped, and therefore, as shown in FIG. Sufficiently compressed aerated concrete is inserted between 5a and 5a, and a strong pull-out strength can be obtained by the wedge effect of this compressed aerated concrete and the prevention of the leg pieces 5a and 5a from restoring by the wedge body 10. become.

〔effect〕

As described above, according to this invention, a breakable part is provided in the slit in the leg of the nail body, and the breakable part receives the washer and wedge member halfway through driving, so the leg Did not open legs in the first half,
The legs can be opened reliably only in the latter half of driving, and sufficient pull-out strength can be obtained by opening the legs.

Further, by opening the legs using the wedge members and compressing the aerated concrete, the compressed aerated concrete can be inserted between the legs, and the pull-out strength can be significantly improved.

Furthermore, since the washer and wedge member are formed separately, they are easy to manufacture and can be easily installed on the leg.Moreover, the overlapping surface of the inclined surface and the wedge member can be easily removed from the recess and protrusion. Since the fitting portion is provided in the length direction of the leg, the wedge member can be stably set in the radial direction relative to the leg.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the split leg nail according to this invention.
Figure 2 is a longitudinal sectional front view showing the middle of driving the same as above, Figure 3
The figure is a side view of the same, and FIG. 4 is a longitudinal sectional front view when driving is completed. DESCRIPTION OF SYMBOLS 1... Nail body, 2... Washer, 3... Wedge member, 5... Leg part, 5a... Leg piece, 6... Slit, 7... Inclined surface, 9... Fitting part, 12... Destructible parts.

Claims (1)

[Scope of utility model registration request] The nail body has legs that are divided into multiple parts by slits extending from the tip along the axial direction, and the nail body has an inclined surface with a widening tip formed on the inner surface of the tip side of both legs, and the legs are movable in the axial direction. A washer that fits outwardly so as to fit into the slit, and a plate-shaped body that is formed separately from this washer and that is inserted into the top end of the wedge body that fits between the inclined surfaces and on the tip side of the slit. A wedge member is formed by providing a wedge member, and a breakable part that receives a fitting part of the washer is provided in the slit of the leg part, and the breakable part is located approximately in the middle of the leg part in the axial direction. The member is formed to a length such that the upper end of the plate-like body abuts the breakable part via the fitting part of the washer with the wedge body aligned between the inclined surfaces of the tip of the leg, A split-leg nail in which a fitting portion consisting of a recess and a protrusion is provided along the length of the leg on the overlapping surface of the wedge body.