JP2003184250A - Wedge for stair tread - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wedge for fixing a stair tread, which positively and rigidly fixes the tread even if the inclined angle of an inclined surface of the wedge or the inclined angle and shape of a wedge hole vary from one to another. <P>SOLUTION: The wedge for the tread includes an upper-side press-contact surface 4 for bearing a lower surface of the tread 3, and the lower-side inclined surface 5. The inclined surface 5 is formed so as to be longitudinally convex, and has a slipout preventive projection 7 formed thereon. When the wedge for the tread is driven into the wedge hole 2, the convex inclined surface 5 is flatly crushed to be brought into intimate contact with the wedge hole 2, whereby the variation in the inclined angle of the wedge hole is absorbed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge for a tread for driving a wedge between a wedge hole formed in a side frame of a stair and a lower surface of a side end of the tread to fix the tread.

[0002]

2. Description of the Related Art Japanese Utility Model Publication 7-7467 and Japanese Utility Model Publication 6-40755 are known as conventional wedges for treads of this type. The former wedge is made of a plastic molded product with an angled cross section or a T-shaped cross section that integrally has a wedge part and a fastening part, and has a non-slip uneven surface on the upper surface of the wedge part, that is, the surface on the side that receives the tread. It is provided and a nail hole is formed in the fastening portion. In the latter, two wedge portions are integrally provided in a state of being orthogonal to each other in an angled cross section, and a nail hole is formed in each wedge portion. In the wedge of Japanese Utility Model Laid-Open No. 56-34936, a nail hole is formed on the side surface of a plastic wedge portion.

[0003]

Many of the plastic-molded wedges for treads often have variations in their inclination angles due to shrinkage deformation during molding or local sink deformation. In addition, the inclination angle of the wedge hole to be formed in the side frame also varies. Therefore, when the wedge body is driven between the wedge hole of the side frame and the tread, the tread may not be securely fixed, and the tread may rattle or squeak when the stairs climb up and down.

Further, in the case of a tread wedge having a nail hole formed on its side surface, since the vertical distance between the tread plate located directly above and the nail head is small, the tread plate interferes and it is difficult to drive the nail.
Further, since the bite depth of the nail into the side frame is reduced by the depth of the wedge hole, there is a disadvantage that it is difficult to obtain sufficient fastening strength with the nail. In order to avoid such a disadvantage and to cope with the difference in left-right handedness, the wedge main body is formed into an angled cross section or a T-shaped cross section, and a fastening portion is provided separately from the wedge portion, but on the side surface Compared with a wedge having a nail hole, the amount of resin used increases by the amount of the fastening portion, and the manufacturing cost increases by that amount.

An object of the present invention is to securely fix the tread plate to prevent squeak noise and rattling even if there are variations in the inclination angle on the wedge body side, the inclination angle and shape on the wedge hole side. It is to provide a wedge for a stair tread that can be done.

The object of the present invention is to easily perform a fastening operation of a fastening body such as a nail or a screw although the fastening hole is formed on the side surface of the wedge body, and to sufficiently secure the fastening strength by the nail or the screw. It is to provide a wedge for stair treads that can be demonstrated and firmly fixed to the side frame.

An object of the present invention is to provide a group of projections on the inclined surface on the side that comes into contact with the wedge holes so that the tread wedges can be securely fixed and held during driving or at the end of driving. .

[0008]

According to the present invention, as shown in FIG. 1, a tread plate 3 is fixed by being driven between a wedge hole 2 formed in a side frame 1 of a stairway and a lower surface of a side end of a tread plate 3. In the wedge for a tread, which is long in the front-rear direction, an upper pressure contact surface 4 that receives the lower surface of the tread 3 and a lower inclined surface 5 that vertically opposes with the facing interval gradually decreasing in the front-rear direction with respect to the pressure contact surface 4. And the inclined surface 5 is formed in a projected arc shape at least at an intermediate portion in the front-rear direction.

Specifically, a protrusion 7 for preventing the slip-out is formed on the inclined surface 5. Further, an insertion hole 6 for the fastening body 8 is formed obliquely upward from one side surface on the left and right sides to the other side surface.

Alternatively, as shown in FIG. 4, a wedge portion 10 having a pressure contact surface 4 and an inclined surface 5 is integrally formed with a fastening portion 11 orthogonal to the pressure contact surface 4 so as to extend downward.
The insertion hole 6 for the fastening body 8 can be formed in the fastening portion 11. At that time, the wedge portion 10 has a right wedge portion 10R which is alternatively used as shown in FIG.
You may make it equipped with the wedge part 10L for the left.

[0011]

According to the present invention, in the wedge for the tread having the upper pressure contact surface 4 and the lower inclined surface 5, the inclined surface 5 is provided.
Is formed in a protruding arc shape in the front-rear direction, so that when the wedge body is driven into the wedge hole 2, the wedge hole 2 is formed so that the middle portion of the inclined surface 5 in the front-rear direction is flattened.
It is possible to absorb variations in gradient angle by contacting with. Therefore, according to the wedge for a tread of the present invention, the tread 3 can be reliably fixed even when there are variations in the inclination angle, the inclination angle and the shape of the wedge hole 2 side, and the squeak noise is generated when the stairs are moved up and down. It is possible to surely prevent the occurrence of a crack and the rattling of the tread plate 3. Moreover, since the inclined surface 5 side is formed in a protruding arc shape,
In the state where the wedge body is driven into the wedge hole 2, the tread plate 3 can be pushed upward in a state where the entire pressure contact surface 4 is in close contact with the lower surface of the tread plate 3 to bring the pressure contact surface 4 into close contact with the upper surface of the wedge hole 2. Therefore, the tread plate 3 can be securely and firmly fixed.

According to the tread wedge having the projection 7 formed on the inclined surface 5, the friction resistance between the two can be increased by the projection 7 in the state of being driven into the wedge hole 2, so that the wedge during or after the driving. The body can be securely fixed and held, and the wedge effect is improved by the deformation stress of the protrusion 7.

If the insertion hole 6 is formed obliquely upward from one side surface to the other side surface, the nail 8 can be driven, for example, at a position where the head of the nail 8 is sufficiently separated from the lower surface of the tread plate 3. Despite the insertion hole 6 formed on the side surface of the wedge body, the fastening body 8 can be easily fastened, and the fastening body 8 bites into the side frame 1 at an angle. The fastening strength is also improved, and the wedge body can be firmly fastened and fixed to the side frame 1. If the insertion hole 6 is provided on the side surface of the wedge main body, the wedge can be used for both the right and the left by only preparing one kind of wedge, so that the wedge manufacturing cost can be reduced accordingly.

As shown in FIG. 4, according to the wedge for the tread plate in which the insertion hole 6 for the fastening body 8 is formed in the fastening portion 11 orthogonal to the press contact surface 4, the fastening body 8 is driven at a position away from the tread plate 3. Therefore, the work for fixing the wedge can be performed easily and safely. Then, as shown in FIG. 5, if the right wedge portion 10R and the left wedge portion 10L are integrally provided, it is only necessary to prepare one kind of tread wedges.
You can fix both ends of the, and you don't have to worry about right or left wedge at the construction site.

[0015]

(First Embodiment) FIGS. 1 to 3 show a first embodiment of a wedge for a tread according to the present invention, in which a wedge hole 2 formed in a side frame 1 of a staircase and a side frame 1 are formed. It is driven between the tread plate 3 and the tread plate 3 that has been fitted to fix the left and right ends of the tread plate 3. The tread wedge includes a horizontal and flat upper pressure contact surface 4 that receives the lower surface of the tread 3, and a lower inclined surface 5 that vertically opposes with the facing interval gradually decreasing in the front-rear direction with respect to the pressure contact surface 4. It is made of a plastic molded product made of high-density polyethylene having a quadrangular cross section as a raw material, and a plurality of insertion holes 6 are formed so as to extend obliquely upward from one side surface to the other side surface. That is, in FIG. 1, the upper and lower pressure contact surfaces 4 and the inclined surfaces 5 are configured such that the vertical distance between the right rear end and the left front end is gradually narrowed. In order to avoid a decrease in the strength of the wedge, the right through-hole 6 and the left through-hole 6 are formed such that their forming positions are shifted forward and backward as shown in FIG. The central axis of each insertion hole 6 is inclined 60 degrees with respect to the side surface of the wedge.

In order to securely fix the tread plate 3 even when the inclination angle of the wedge itself and the inclination and shape of the wedge hole 2 vary, the inclined surface 5 is formed by a gentle arcuate surface in the front-rear direction. A group of projections 7 extending in the left-right direction are formed on the inclined surface 5 at a constant pitch in the front-back direction. As shown in FIG. 2, each protrusion 7 is formed so as to project in a saw-tooth shape in cross section, and when the wedge body is driven, it is easily deformed due to frictional force, but the wedge body is pulled out toward the starting end side (right side in the figure) of driving. This is to enable a large deformation resistance to be exerted when trying to come off.

A straight line connecting the front and rear edges of the inclined surface 5 and the pressure contact surface 4
The angle sandwiched by and is about 3 to 5 degrees, the radius value R of the projecting arc surface is 1000 to 1500 mm, and the front-back length of the pressure contact surface 4 is 150 to
It was set to 200 mm. The protrusion size of the protrusion 7 is 0.8 to 1.5 mm
And 1 and 2, reference numeral 13 is a riser plate,
Reference numeral 14 is a mounting bracket for the riser plate 13, which has an anti-slip portion on its upper surface.

When constructing a staircase, as shown in FIG. 1, the tread plate 3 is attached to the side frame 1 and then the tread plate wedge is driven into the wedge hole 2. At this time, since the inclined surface 5 is formed as a projecting arc surface, the inclined surface 5 driven into the wedge hole 2
However, the flat surface is brought into contact with the lower surface of the wedge hole 2 so as to be flattened and absorbs the variation in the angle. Moreover, the pressure contact surface 4
It is possible to push the tread plate 3 upward so that the entire surface of the tread plate 3 is in close contact with the lower surface of the tread plate 3 and bring the press contact surface 4 into close contact with the upper surface of the wedge hole 2. Therefore, even if the inclination angle of the inclined surface 5, especially the inclination angle or shape of the wedge hole 2 varies, the tread plate 3 can be securely and firmly fixed.

At the contact point of the inclined surface 5 with the wedge hole 2,
Since the driving reaction force of the wedge main body is concentrated, the projection 7 which receives the reaction force bites into the side frame 1 or is crushed and deformed to generate a strong frictional resistance. Therefore, the wedge body does not move in the direction of slipping out of the wedge hole 2, and the driven position is maintained. In this state, a nail (fastening body) 8 is inserted into the insertion hole 6 and driven diagonally upward as shown in FIG. 3 to fix the tread wedge together with the tread 3 to the side frame 1 inseparably. Incidentally, when the pressure contact surface 4 side is formed as the arcuate surface, the tread plate 3 may tilt along the pressure contact surface 4 during long-term use. However, as described above, the inclined surface 5 side is formed as the arcuate surface. Since the pressure contact surface 4 is in close contact with the tread plate 3, the tread plate 3 can be securely and firmly fixed.

(Second Embodiment) FIG. 4 shows a second embodiment of the wedge for a tread according to the present invention. There, on one of the left and right sides of the wedge portion 10 having the pressure contact surface 4 and the inclined surface 5 at the top and bottom,
The fastening portion 11 orthogonal to the pressure contact surface 4 is integrally formed so as to extend downward, and is formed in an inverted L shape in a vertical sectional front view. The insertion hole 6 for the nail is formed in a penetrating shape at the lower end of the fastening portion 11 at a predetermined interval on the virtual horizontal line in the front-rear direction.
The wedge portion 10 has a pressure contact surface 4 and a projected arc-shaped inclined surface 5 as in the first embodiment, and a group of projections 7 are formed on the entire inclined surface 5. In this way, when the fastening portion 11 extends below the wedge portion 10, the nail 8 can be driven in at a position away from the tread plate 3, so that the insertion hole 6 is inclined obliquely as in the first embodiment. You don't have to. However, it is necessary to separately prepare the right and left wedges for the treads of the second embodiment.

(Third Embodiment) FIG. 5 shows a third embodiment of the wedge for a tread according to the present invention, which is a modification of the above second embodiment. There, the fastening portion 11
A wedge portion 10 in which a right wedge portion 10R and a left wedge portion 10L are integrally formed is continuously provided on both left and right sides of the upper end of the, and the whole is formed in a T-shape in cross section. In each of the wedge portions 10R and 10L, the protrusion 7 is formed on the lower inclined surface 5 similarly to the first embodiment. Others are the same as those in the second embodiment, so the same members are designated by the same reference numerals,
The description is omitted.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment of the wedge for a tread according to the present invention. There, two wedge portions 10 were arranged adjacent to each other in an orthogonal manner, and the whole was formed in an angle cross-section. In this case, when one of the wedge portions 10 is used for the right side, the other wedge portion 10 in the vertical direction functions as the fastening portion 11. Further, when the whole is rotated 90 degrees in the clockwise direction from the state shown in the figure around the axis in the front-rear longitudinal direction, it can be used as a wedge for the left. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same members and the description thereof will be omitted.

In addition to the above, the tread wedge is not necessarily a plastic molded product, and may be a woodwork product or a press fitting. The wedge for the tread may be formed of a plastic material other than polyethylene. The projecting arc surface that forms the inclined surface 5 is sufficient if it exists at least in the middle portion in the front-rear direction, and it can be formed by combining a plurality of arcs. It may be formed in a projected arc shape. The protrusion 7 can be omitted. The protrusion 7 does not need to have a saw blade cross section, and can be changed to a continuous chevron shape, a continuous wave shape, or an inverted trapezoidal cross section. Instead of the protrusion 7, a rubber layer can be attached and fixed to the middle of the inclined surface 5. If necessary, a recess may be provided on the side surface of the tread wedge to reduce the weight of the entire wedge. The inclination angle of the central axis of the insertion hole 6 does not need to be 60 degrees and can be changed according to the left and right thickness dimensions of the wedge and the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment.

FIG. 2 is a perspective view of an essential part in a state where a tread wedge of the first embodiment is separated.

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a perspective view showing a second embodiment.

FIG. 5 is a perspective view showing a third embodiment.

FIG. 6 is a perspective view showing a fourth embodiment.

[Explanation of symbols]

1 side frame 2 wedge holes 3 treads 4 Pressure contact surface 5 inclined surface 6 insertion holes 7 protrusions 8 fastening body

Claims (5)

[Claims] 1. A wedge hole 2 formed in a side frame 1 of a stair,
A wedge for a tread, which is driven between the bottom surface of the side end of the tread plate 3 and fixed in the front-rear direction, for fixing the tread plate 3, and an upper pressure contact surface 4 for receiving the lower surface of the tread plate 3, and a pressure contact surface 4.
And a lower inclined surface 5 that vertically opposes with the facing interval gradually decreasing in the front-rear direction, and the inclined surface 5 is at least an intermediate portion in the front-rear direction.
A wedge for a tread of stairs, which is formed in a projected arc shape. 2. The wedge for a stairway tread according to claim 1, wherein a protrusion 7 for preventing slipping out is formed on the inclined surface 5. 3. A wedge for a stair tread according to claim 1 or 2, wherein the through hole 6 for the fastening body 8 is formed obliquely upward from one side surface on the left and right sides to the other side surface. 4. A wedge portion 10 having a pressure contact surface 4 and an inclined surface 5 is integrally formed with a fastening portion 11 which is orthogonal to the pressure contact surface 4 and extends downward. The step plate wedge according to claim 1 or 2, wherein an insertion hole 6 is formed. 5. The wedge for a stair tread according to claim 4, wherein the wedge portion 10 includes a right wedge portion 10R and a left wedge portion 10L which are alternatively used.