JPH0626509A - Astride nail - Google Patents

Abstract

PURPOSE:To provide an astride nail having stable anti-pulling strength in spite of the hardness of ALC by forming protrusions for supporting a washer on the periphery of the center area in the axial direction of a leg portion, making the diameter of the distal side from the center area in the axial direction of the leg portion smaller than that of the leg on the head side, and forming a step portion for supporting the washer on the boundary between the distal side and the head side. CONSTITUTION:In an astride nail 1, protrusions 12 for locking a washer 7 fitted from the tip is provided in the position adjacent to the center in the axial direction of a leg portion 3. That is, the washer 7 inserted into the leg portion 3 is contacted to and engaged with the protrusions 12, and in a members for opening the leg portions 3 inserted between the leg pieces 3a, 3a, the tip of a plate-shaped body 11 is contacted to the lower surface of fitting portion 9. Moreover, the outside diameter of the tip from the center area in the axial direction of both leg pieces 3a, 3a of the leg portion 3 is formed smaller than that of the head portion side. A step portion 16 for supporting the washer 7 is formed on the end of the head side by the difference between these outside diameters. Thereby, the restrain of the astride of the leg pieces 3a, 3a by driving the astride nail 1 into ALC is performed by locking the washer 7 by the step portion 16 when it abuts thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open leg nail used for fixing various attachment parts to ALC (lightweight cellular concrete).

[0002]

2. Description of the Related Art As a conventional open-leg nail used for ALC,
For example, the open-leg nail proposed by Japanese Examined Patent Publication No. 2-61641 has a leg portion divided into a plurality of slits provided along the axial direction from the tip, and a small-diameter connecting portion in which both leg portions are located in the slit. And a plate body that fits on the tip side of the slit at the upper end of the wedge body that fits between the tilted surfaces of the legs And an open leg member provided with a washer on the upper end of the plate-shaped member for external fitting to the leg portion.

When the above-mentioned nail spreads into the ALC, the wedge at the tip of the leg receives the pressure by compressing the ALC, so that the connecting portion that has connected the leg up to that time is cut, and both legs are on the side surfaces of the wedge. Is opened and the legs are opened in the ALC to fix the attachment member to the ALC by the head.

As described above, the conventional spread leg nail for ALC is
The ALC was opened by the pressure received by compressing the ALC, and the attachment member was fixed while improving the pull-out resistance.

[0005]

By the way, as in the conventional open-leg nail for ALC as described above, the structure in which the ALC is opened depending on the pressure received by compressing the ALC is an ALC.
The hardness varies depending on the manufacturer, the degree of dryness and humidity, and the yearly changes, so the hardness is not always constant.
If the ALC is too hard, the connecting part of the legs will be broken at almost the same time as the driving, and it will be driven in with the legs open from the initial stage of driving, forming a cavity in the ALC, which results in sufficient pulling resistance. In some cases, the traction cannot be obtained.

Further, in the case of a soft ALC, sufficient pressure is not applied to the wedges at the ends of the legs, the connecting portions connecting the legs cannot be cut, and the legs directly enter the ALC to open the legs. However, there is a problem in that sufficient pull-out strength cannot be obtained because the state does not occur.

In order to solve the above problems, it is an object of the present invention to provide an open leg nail for ALC which can always obtain stable pull-out strength regardless of the change in hardness of ALC. .

[0008]

In order to solve the above problems, the first invention adopts a structure in which a projection for supporting a washer is provided on the outer periphery of the leg portion near the center in the axial direction. .

According to the second aspect of the invention, the tip side from the vicinity of the axial center of the leg is made smaller in diameter than the leg diameter on the head side, and a step portion for supporting the washer is formed at the boundary between the tip side and the head side. The configuration is adopted.

According to the third aspect of the present invention, the tip side from the vicinity of the axial center of the leg portion is made partially smaller in diameter than the leg diameter of the head, and a step portion for supporting the washer is formed at the portion where the leg diameter is different. The configuration is adopted.

A fourth aspect of the present invention employs a structure in which a recess is provided in the outer periphery of the leg portion near the center in the axial direction, and the inner peripheral surface of the washer is fitted into the recess.

[0012]

When the open leg nail having the above-mentioned structure is driven into the ALC, the wedge body moves upward due to the pressure received by the tip of the wedge sufficiently compressing the ALC, and the leg portion tries to open the leg. However, the upper end of the plate-like member in the open leg member stops contacting the lower surface of the fitting portion passed to the central portion of the washer, and the distance from the tip of the leg portion to the washer is completely in the open leg nail member and ALC. The washer engages with the projection, step, and recess provided on the outer periphery of the leg in the vicinity of the center in the axial direction, so that the washer is prevented from moving toward the head and the leg is opened. Compress the ALC sufficiently with the wedge tip instead.

When the washer is further driven in contact with the mounting member, the engaging portion of the washer with the protrusion, step, recess, etc. is sheared, the washer is free to move relative to the leg, and the inside of the leg is The mounting member is fixed to the ALC by entering while closely adhering to the side surface of the wedge body and opening the leg in the ALC.

[0014]

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

The first embodiment shown in FIGS. 1 to 3 is a type in which the washer is locked to the leg portion by a projection provided on the leg portion.

As shown in FIG. 1, the spread leg nail 1 has a head 2 at one end.
The leg portion 3 provided with is divided into leg pieces 3a, 3a by a slit 4 provided so as to reach the head 2 along the axial direction from the tip, and the inclined surface 5 with the tip widened on the inner surface of the tip side of both the leg pieces 3a, 3a. ,
5 is formed by combining a nail main body 6 in which 5 is formed, a washer 7 which is fitted onto the leg portion 3 so as to be axially movable, and an opening leg member 8 which is inserted into a tip portion between the leg pieces 3a and 3a. Has been done.

As shown in FIG. 1D, the washer 7 is provided with a band-shaped fitting portion 9 which fits into the slit 4 on the inner circumference of an annular portion which is fitted onto the leg portion 3. In addition, the spread leg member 8 is a washer 7
The wedge-shaped body 10 is formed as a separate body and is fitted between the opposing inclined surfaces 5 and has a plate-shaped body 11 inserted at the tip end side of the slit 4 at the upper end thereof.

A protrusion 12 for locking the washer 7 inserted from the tip side is provided at a position near the center in the axial direction of the leg portion 3.

In the case of the example shown in FIGS. 1C and D, the projection 12 is formed by partially projecting an angular axis at a position close to the slit 4 on the outer peripheral surfaces of both leg pieces 3a and 3a.

In the example shown in FIG. 2, the projections 12 are separately provided at a plurality of positions in the circumferential direction on the outer peripheral surfaces of both leg pieces 3a, 3a. Further, in the example shown in FIG. 3, a flange-shaped projection 12 is provided which is continuous in the circumferential direction of the outer peripheral surfaces of both leg pieces 3a, 3a.

The washer 7 inserted in the leg 3 is provided with a protrusion 12
The leg opening member 8 inserted between the tip ends of the leg pieces 3a, 3a in the state of being brought into contact with the upper end of the plate-shaped member 11 has a length such that the upper end of the plate member 11 abuts or approaches the lower surface of the fitting portion 9. There is.

The first embodiment of the present invention has the above-mentioned structure, and in the spread leg nail 1, the washer 7 inserted into the leg portion 3 abuts and engages with the projection 12, and the leg pieces 3a, 3a. The leg member 8 inserted between them is in a set state in which the upper end of the plate-shaped body 11 is in contact with the lower surface of the fitting portion 9.

FIG. 4 shows how the open-leg nail 1 is driven. First, as shown in FIG. 4A, the tip of the leg portion 3 is inserted into the prepared hole 15 of the mounting member 14 which is placed on the surface of the ALC 13, and then the ALC 13 is attached. When the spread leg nail 1 is driven toward the end, the tip of the leg portion 3 enters into the ALC 13, and the spread leg member 8 is wedge-shaped.
The front end surface of the plate moves to the upper side by the pressure received by sufficiently compressing the ALC 13 and tries to open the leg, but the upper end of the plate-shaped body 11 is the lower surface of the fitting part 9 passed to the central part of the washer 7. Since the washer 7 engages with the projection 12 on its upper surface, the leg opening member 8 does not move, and thus the leg portion 3
Does not open the leg pieces 3a and 3a until the portion from the tip to the washer 7 completely enters the mounting member 14 and the ALC 13. Therefore, the tip of the wedge body 10 can sufficiently compress the ALC 13.

When the driving is further continued, the washer 7 comes into contact with the surface of the mounting member 14 and stops, whereas the leg portion 3 tries to enter, so that the projection 12 is sheared by the driving force or the washer 7 moves. A part is sheared, and the leg 3 enters with the washer 7 left.

That is, when the washer 7 is unlocked by shearing the projection 12, the inner peripheral portion of the washer 7 is abraded, so that the washer 7 is unlocked. Occurs due to a combined condition of shearing of the protrusion 12 and abrasion of the inner circumference of the washer 7.

When the leg portion 3 is further driven after the washer 7 is stopped, as shown in FIG. 4B, the leg pieces 3a, 3a closely enter the side surface of the stopped wedge body in the ALC 13, whereby the two leg pieces are contacted. 3a, 3a enter while opening legs on both sides.

As shown in FIG. 4C, the head 2 is in a completely driven state.
Presses and fixes the mounting member 14 via the washer 7, and the leg piece 3
a and 3a open on both sides in ALC13,
Sufficient pull-out strength can be obtained.

Next, a second embodiment shown in FIGS. 5 to 7 shows an example in which the washer is locked by a step portion provided on the outer circumference of the shaft portion. The same parts as those in the first embodiment shown in FIGS. 1 to 4 are designated by the same reference numerals and will not be described. The same applies to the following examples.

In the example shown in FIG. 5, both leg pieces 3 in the leg portion 3 are shown.
The outer diameter of the tip side is smaller than the outer diameter of the head side from the vicinity of the axial center of 3a, 3a, and a step portion 16 for supporting the washer 7 is formed at the end portion of the head side due to the difference in the outer diameter. There is.

As shown in FIG. 5C, the inside diameter of the washer 7 is formed so as to fit over the small diameter side of the leg portion 3, and the washer 7 inserted into the leg portion 3 from the tip side has a step portion 16 at its upper surface. It will be locked at the position where it abuts.

In the examples shown in FIGS. 6 and 7, a plurality of axially long ridges 17 are formed on the outer peripheral surfaces of both leg pieces 3a, 3a in the leg portion 3 from the vicinity of the center in the axial direction to the outer peripheral surface on the head 2 side. By projecting and partially increasing the outer diameter on the head side, each ridge 1
A step portion 16 for supporting the washer 7 is formed at the end portion of 7.

FIG. 6 shows that protrusions 17 are provided on the outer surfaces of both leg pieces 3a, 3a at positions on both sides close to the slit 4, and FIG. 7 shows a total of three sides on both sides close to the slit 4 of both leg pieces 3a, 3a and their middle. Protrusions 17 are provided at the respective positions. In each of these examples, the inside diameter of the washer 7 is designed to fit exactly on the tip end side of the leg portion 3, and is supported by each step portion 16.

In the spread leg nail 1 according to the second embodiment,
The restraint of the leg pieces 3a, 3a from being opened by driving into the ALC is carried out by the lock of the washer 7 in contact with the step portion 16, and the opening of the leg is started by the protrusion 17 on the inner circumference of the washer 7. Will be carried out by shearing.

A third embodiment shown in FIGS. 8 and 9 is a leg portion 3.
2 is a type in which the tip end side from the vicinity of the axial center of both leg pieces 3a, 3a is made partially smaller in diameter than the outer diameter on the head side, and the washer 7 is locked by the stepped portion generated by this small diameter portion.

In the example shown in FIG. 8, long axial recesses 18 are provided at positions on both sides of the leg pieces 3a, 3a closer to the slit 4 on the tip side than near the central portions of the leg pieces 3a, 3a. The outer diameter of 3a is smaller than that of other portions.

The inside diameter of the washer 7 which is fitted onto the leg portion 3 is
As shown in FIG. 8C, the leg pieces 3a, 3a are shaped so as to fit exactly in the portions where the recesses 18 are provided. Therefore, the washer 7 has an inner periphery at the positions of both ends of the fitting portion 9 inside. A protrusion 19 projecting toward the flat recess 18 is formed, and the washer 7 is locked in the middle of the leg 3 by abutting engagement with the step 16 provided at the upper end of the flat recess 18. become.

In the example shown in FIG. 9, the outer shape from the middle of both leg pieces 3a, 3a to the tip is formed as a three-sided polygonal surface, a step portion 16 is provided at the upper end of each surface, and the inside diameter of the washer 7 is set as a polygonal surface. The washer 7 is locked to the leg portion 3 by engaging the step portion 16 with the inward projection 19 formed by the straight edge of the polygon.

The open-leg nail 1 of the third embodiment is constructed as described above, and the leg pieces 3a, 3a are formed by driving into the ALC.
The leg opening of the washer 7 is suppressed by the engagement of the projection 19 of the washer 7 with the step 16, and the start of the leg opening is stopped by the step 16.
This is done by shearing the protrusion 19 of the washer 7.

Next, a fourth embodiment shown in FIG. 10 shows a type in which a washer is locked in a recess provided on the outer peripheral surfaces of the leg pieces 3a, 3a. A recess 20 along the circumferential direction is partially provided at a position near the center in the axial direction, and the recess 20 is fitted to both sides of the fitting portion 9 on the inner circumference of the washer 7 to be fitted on the leg 3. It has a structure provided with a protrusion 19 to be fitted.

The width of the fitting portion 9 of the washer 7 is made narrower than the width of the slit 4, and when the washer 7 is fitted onto the leg portion 3, both the leg pieces 3a and 3a are mutually attached by the protrusions 19 on both sides. When pressed so as to approach each other, both leg pieces 3a, 3a are restored by their own elasticity at the position where the projection 19 faces the recess 20, and the recess 20
The washer 7 is locked to the leg portion 3 by externally fitting on the protrusion 19.

In the open leg nail according to the fourth embodiment, the leg piece 3a, the leg piece 3a, and the washer 7 fitted and locked in the recess 20 are used.
3a is prevented from opening, and the opening of the leg is started at the recess 20.
It is performed by shearing the protrusion 19 of the washer 7 by the upper end step 16 of the.

In any of the embodiments, the leg piece 3
Although the example in which the projections 12 and the step portions 16 provided on the a and 3a are brought into contact with the upper surface of the washer 7 to lock them, as shown in FIG. The portion with which the portion 16 abuts may be made thin so that its upper surface is located below the upper surface of the washer 7.

Further, in each embodiment, as shown in FIG. 12, a required number of sets of protrusions fitted to each other on the inclined surfaces 5 of both leg pieces 3a, 3a and the overlapping surface of the wedge body 10 of the leg opening member 8. Two
1 and the concave groove 22 are provided along the axial direction of the leg portion 3, and the leg piece 3
The leg opening member 8 inserted between a and 3a may be positioned and held in the radial direction, and the tip ends of the leg portions 3 and the side surfaces of the wedge body 10 have substantially the same shape. Although an arcuate sharpened shape is shown, it may be formed at a straight sharpened end. In addition, as shown in FIG.
The width W of the plate-like body 11 and the width W ₁ of the wedge body 10 are made equal to each other, and the tip end surface of the wedge body 10 is a flat surface having a wide area so that the pressure receiving area of the wedge body 10 at the time of driving into the ALC is increased. May be.

Further, although the leg portion 3 in each of the embodiments has a shape in which the circular axis is divided into two parts by a slit, a square cross-sectional shape may be adopted. Also, as shown in FIG.
Is extended on the head 2 via a small-diameter breaking portion 23.
4 may be provided.

Further, in each embodiment, as shown in FIG. 14, the fitting portion 9 of the washer 7 is wholly or partially projected to the lower surface side, and the upper end of the plate-like member 11 of the opening leg member 8 is projected. If the recessed portion 25 is fitted to the portion, the leg piece 3a,
Positioning and holding of the plate-shaped body 11 inserted between 3a can be performed.

[0046]

As described above, according to the present invention, the washer is externally fitted and locked in the middle of the leg, and the washer supports the opening leg member. The leg firmly moves straight until the washer comes into contact with the mounting member and the lock is released, and after the lock is released, the leg is opened. Therefore, the leg is surely opened in the ALC. As a result, sufficient pull-out strength can be obtained.

Further, since the legs are opened after a certain amount of driving, the same opened state can be obtained for all of the ALCs whose hardness is not constant due to the manufacturer, the condition of dryness and humidity, and aging. A constant leg opening action is always performed on these ALCs, and maximum pull-out strength can be obtained.
There is an effect that it can be installed safely and securely.

Further, since the nail body is provided with slits only in the leg portions, it can be mass-produced inexpensively by casting or pressing.

[Brief description of drawings]

1 is a front view of an open-leg nail according to the present invention, B is a cutaway side view of the same portion, C is a cross-sectional view taken along the arrow aa of B, and FIG.
Is an exploded perspective view showing the main part of the above.

FIG. 2A is a front view showing another example of the above, B is the same cutaway side view, C is a cross-sectional view taken along the arrow bb of B, and D is a front view showing another example of the head of the above. Figure

3A is a front view showing another example, B is a cutaway side view of the same portion, and C is a cross-sectional view taken along the arrow cc of B. FIG.

4A, 4B, and 4C are explanatory views showing the order of the steps of driving the nail with an open leg.

5A is a front view showing a second embodiment of the spread leg nail, B is a partially cutaway side view of the same, C is a cross-sectional view taken along the arrow d-d of B, and D is a perspective view of the leg portion. Figure

FIG. 6A is a front view showing another example of the above, B is a side view of the same, C is a cross-sectional view taken along the arrow ee of B, and D is an exploded perspective view of essential parts of the same.

7A is a front view showing another example, B is a cutaway side view of the same portion, and C is a cross-sectional view taken along the arrow f-f of B. FIG.

8A is a front view showing the third embodiment, B is a cutaway side view of the same portion, C is a cross-sectional view taken along the arrow gg of B, and D is an exploded perspective view of the same as above.

9A is a front view showing another example of the above, B is a cutaway side view of the same portion, C is a cross-sectional view taken along the arrow h-h of B, and D is a perspective view of the same main portion.

10A is a front view showing the fourth embodiment, B is a cutaway side view of the same portion, C is a cross-sectional view taken along the arrow ii of B, and D is a perspective view of the same as above.

FIG. 11 is an exploded perspective view showing another example of the protrusion provided on the washer.

FIG. 12 is an exploded perspective view showing the relationship between the leg portion and the leg opening member.

FIG. 13 is a perspective view showing another example of the wedge body.

FIG. 14 is an explanatory view showing a connecting structure of a washer and a plate-like body.

[Explanation of symbols]

 1 Open leg nail 2 Head part 3 Leg part 4 Slit 5 Sloping surface 6 Nail body 7 Washer 8 Open leg member 9 Fitting part 10 Wedge body 11 Plate-like body 12 Projection 16 Step 17 Protrusion 19 Protrusion

Claims (4)

[Claims] 1. A nail main body having a plurality of leg portions divided by slits provided along the axial direction from the tip, and a leg main body having an inclined surface with a tip widening formed on the inner surface at the tip end side of each leg portion. A washer that is fitted externally so that it can move in the axial direction and that has a fitting part for the slit, and a separately formed washer from this washer. An open leg nail comprising an open leg member provided with a plate to be inserted, characterized in that a protrusion for supporting a washer is provided on an outer periphery of a leg portion near an axial center thereof. 2. A nail main body having a plurality of leg portions divided by slits provided along the axial direction from the tip, and a slanted surface having a widened tip formed on the tip inner surface of each leg portion, and the leg portion. A washer that is fitted externally so that it can move in the axial direction and that has a fitting part for the slit, and a separately formed washer from this washer. In an open-leg nail consisting of an open-leg member provided with a plate-shaped body to be inserted, the tip side from the vicinity of the axial center of the leg is made smaller than the leg diameter on the head side, and at the boundary between the tip side and the head side. An open leg nail characterized in that a step portion for supporting a washer is formed. 3. A nail main body having a plurality of leg portions divided by slits provided along the axial direction from the tip end, and an inclined surface with a tip widening formed on the inner surface on the tip end side of each leg portion, and a leg body. A washer that is fitted externally so that it can move in the axial direction and that has a fitting part for the slit, and a separately formed washer from this washer. In an open-leg nail consisting of an open-leg member provided with a plate-like body to be inserted, the tip side from the vicinity of the axial center of the leg part is made partly smaller in diameter than the leg diameter of the head, and at the part where this leg diameter differs An open leg nail characterized in that a step portion for supporting a washer is formed. 4. A nail main body having a plurality of leg portions divided by slits provided along the axial direction from the tip, and a nail main body having an inclined surface with a tip widening formed on the tip-side inner surface of each leg portion, and the leg portion. A washer that is fitted externally so that it can move in the axial direction and that has a fitting part for the slit, and a separately formed washer from this washer. An open-leg nail composed of an open-leg member provided with a plate-shaped body to be inserted is characterized in that a recess is provided on the outer periphery near the axial center of the leg, and the inner peripheral surface of the washer is fitted into the recess. Open leg nail to do.