JPH027172Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to the lower frame of fittings.

(Prior Art and Problems) A joinery frame having a hollow cross section and formed by extrusion molding a synthetic resin material is generally known. In such a fittings frame, reinforcing materials are attached to hollow parts, etc., if necessary. For example, as in Japanese Utility Model Application No. 58-33685, a projection is provided in the hollow part of a resin frame, and a hollow metal reinforcing member held by the projection is attached. However, with this structure, the resin frame and the reinforcing material are in point contact, and if the resin frame is deformed due to temperature deformation, the deformation of the resin frame cannot be prevented, and the reinforcing material is inside the hollow part of the resin frame. There are drawbacks such as rattling.
In particular, the lower frame must have a stronger structure than the upper and horizontal frames, as it bears the load of shutters, sashes, and other doors.

Conventionally, a square pipe 10 made of steel was placed inside the hollow part 7 of the lower frame main body 5, and one end was fixed to the indoor side with screws 8 or the like, as shown in FIG.

However, when square pipes are used as reinforcement materials,
Since the wall thickness is constant, there are the following disadvantages.

That is, if the reinforcing member is considered to be a cantilever beam, the bending moment acting on it will be maximum at the fixed part on the indoor side and minimum at the tip part on the outdoor side. On the other hand, since a square pipe has a uniform cross section, the bending stress is also greatest at the critical cross section where the bending moment is greatest. Therefore, it cannot be said that the material is not used effectively, and the weight increases accordingly.

Moreover, since the lower frame body and the reinforcing material are in mere point or surface contact, the lower frame body is likely to deform downward in the outdoor direction.

(Means for Solving the Problems) This invention was devised in view of the above-mentioned conventional problems, and it is possible to reduce the material and weight of the lower frame and to reliably prevent deformation of the lower frame body. The purpose is to provide

The lower frame according to this application has a reinforcing material made of a hollow formwork with a substantially triangular cross section arranged in a hollow part of the lower frame main body made of synthetic resin, and the short side of the reinforcing material is connected to the lower frame main body. It is fixed on the inside of the room. A locking piece that locks onto a protrusion provided on the lower frame body is formed at the upper end of the long side of the reinforcing member.

(Function) In order to use the material of the beam effectively, it is sufficient to always equalize the bending stress σ _b corresponding to the bending moment of each cross section. That is, in the case of σ _b =M/Z, the section modulus Z may be changed in proportion to the bending moment M, so in the case of a cantilever beam, the shape of the beam may be triangular. (Strictly speaking, the hypotenuse is parabolic, but it can be ignored.) Note that the shape of the beam will vary slightly depending on the magnitude of the load, the point of action, etc., but in this design, it is only necessary to determine the height of the fixed side of the beam. It is enough.

Further, if the cross-sectional area is the same, the moment of inertia of a hollow cross-section is larger than that of a solid cross-section. Therefore, it is better to use a hollow cross section in order to reduce the weight without reducing the rigidity.

(Embodiment) FIG. 1 shows an embodiment of this invention, in which reference numeral 5 indicates a lower frame body, and 1 indicates a reinforcing member.

The lower frame main body 5 is formed by extrusion molding a synthetic resin material, and shoji rails 5'', 5'' are provided protrudingly on the upper wall 5'. Further, a projecting piece 6 is provided protruding from the hollow portion side of the upper wall 5'. In the hollow portion 7, a reinforcing member 1 made of a hollow member having a triangular cross section is attached to the indoor side with screws 8 so that its long side faces the upper wall 5'. The reinforcing material 1 is made of aluminum, and is about 1/3 lighter than conventional steel material with the same cross-sectional area.

Two locking pieces 3 are formed on the long sides of the reinforcing member 1, and these locking pieces 3 are attached to the upper wall 5' of the lower frame body 5.
It is attached so as to lock the protruding piece 6 that protrudes further. Therefore, the lower frame main body 5 is not deformed in the outdoor direction or in the vertical direction due to changes in the weight or temperature of the door, and the door can always be moved smoothly.

In addition, the indoor wall of the lower frame main body 5 is reinforced on both sides by the short side of the reinforcing material 1 and the reinforcing material 9, and has sufficient rigidity against bending stress.
There is no risk of deformation or damage.

Furthermore, the connecting part 4 with the screw 8 formed on the short side of the reinforcing material 1 is made thicker than other parts in consideration of the bending moment that will be applied, so the screw 8 will not be deformed. There is no risk of screw holes becoming loose.

FIG. 2 shows another embodiment in which the projecting piece 6 and the locking piece 3 are also provided on the outdoor side.

In the above embodiment, the hollow part 7 of the lower frame main body 5
Although the shape is rectangular, it may be triangular to match the reinforcing material 1.

(Effects of the invention) Since the reinforcing material is made of a hollow member with a triangular cross section, the bending stress in each cross section is almost equal,
Materials can be used effectively and the weight can be reduced.

Moreover, since it can be used for a lower frame main body having a rectangular hollow part, it can be implemented without changing the shape of the lower frame main body.

A locking piece is formed on the long side of the reinforcing material to lock onto a protruding piece provided on the upper wall of the lower frame main body.
Deformation of the lower frame body due to the weight of the door, temperature changes, etc. can be reliably prevented.

In particular, since deformation of the upper wall on which the shoji rails are provided can be prevented, the shoji slides smoothly.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of this invention, FIG. 2 is a cross-sectional view showing another embodiment, and FIG. 3 is a cross-sectional view showing a conventional example. 1... Reinforcement material, 2... Long side portion, 3... Locking piece,
4...Connecting portion, 5...Bottom frame body, 6...Protrusion piece, 7
...Hollow part, 8...Screw, 9...Reinforcement part, 10...
…Square pipe.

Claims (1)

[Scope of utility model registration request] In the hollow part 7 of the lower frame main body 5 made of synthetic resin material,
Reinforcement material 1 made of hollow material with approximately triangular cross section
The short side of the reinforcing material 1 is fixed to the indoor side of the lower frame main body 5, and the shoji rails 5'' of the lower frame main body 5 are placed on the long side 2 of the reinforcing material 1. A lower frame characterized in that a locking piece 3 is formed to lock onto a protruding piece 6 provided on an upper wall 5' having a diameter 5''.