JPH0119757Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a door frame applied to agricultural doors, etc.

Conventionally, for example, in an agricultural door, a square pipe is used as a middle crosspiece with both ends closed by partial welding with an end plate with a cross-shaped joint protrusion protruding from the surface, and a square pipe with the joint protrusion inserted therein. a pair of side frames each having a locking hole formed in the middle portion thereof to be locked by rotation; an upper frame attached to the upper end side of the side frames; and a lower frame attached to the lower end side of the side frames. There was one equipped with this.

This square pipe of the door frame has the advantage that it can be easily attached by inserting the joint protrusion into the locking hole and rotating it.

However, there was a problem in that water entered through the gap between the end plate of the square pipe and the opening edges at both ends of the square pipe. In other words, if the end plate and the opening edges at both ends of the square pipe are welded around the entire circumference, water will not infiltrate, but usually this is done because it is strong enough or because welding is easier. The end plates are joined by partial welding. As a result, rainwater can enter the inside of the square pipe through gaps in the non-welded parts, and in cold regions, when the pipe reaches freezing temperatures, the square pipe may burst when it is full of water.

Therefore, the purpose of this invention is to provide a door frame that can prevent water from entering the square pipe.

An embodiment of this invention is shown in FIGS. 1 to 6. That is, this door frame 1 has a cross-shaped joint protrusion 5.
A square pipe 2 serving as a middle crosspiece with both ends closed by partial welding with an end plate 4 protruding from the surface, and a locking mechanism that locks the square pipe 2 by inserting a joint protrusion 5 and rotating the square pipe 2. A square pipe is equipped with a pair of side frames 8 having a hole 9 formed in the middle, an upper frame 10 attached to the upper end of the side frames 8, and a lower frame 11 attached to the lower end of the side frames 8. A drain hole 3 is formed so as to span the lower side of the opening edge at both ends of the opening edge 2 and the edge of the end plate 4 opposite thereto.

A joint protrusion 5 is fixed to the center hole 4a of the end plate 4 by caulking or brazing. This joint protrusion 5
Four locking pieces 7 protrude from the tip of the mounting rod part 6 so as to form a cross in the radial direction, and the locking part 7 of each locking piece 7
A is formed in a protruding manner by punching out, and a recessed portion 7b is formed on both sides thereof in the direction of rotation. Further, the distance from the surface of the locking portion 7a to the surface of the end plate 4 is set to a constant dimension _t2 . On the other hand, the side frame 8 has a locking hole 9 similar to the front shape of the joint protrusion 5 at the side surface connection part, and has a wall thickness t ₁ of the side frame 8.
is set to be slightly larger than the interval _t2 .

To make the connection, the joint protrusion 5 of the square pipe 2 is inserted into the locking hole 9 and rotated 45 degrees. At this time, since t ₁ >t ₂ , the surface of the locking portion 7a comes into pressure contact with the inner surface of the vertical rectangular pipe 8 and is fixed. Further, the recess 7b allows smooth rotation. If you want to remove it, just rotate it in the opposite direction. Further, even if rainwater flows along the side frame 8 and enters the square pipe 2 along the joint protrusion 7, the water will fall through the drain hole 3, so it will not accumulate in a full state.

With this configuration, the square pipe 2 is not filled with water that has entered into it, so the square pipe 2 will not burst even if the temperature reaches freezing in winter. Further, since the drain hole 3 is formed so as to span the lower side of the opening edge at both ends of the square pipe 2 and the opposing portion of the end plate 4, the strength of the square pipe 2 is not reduced.

As described above, the door frame of this invention consists of a square pipe that serves as a middle crosspiece with both ends closed by partial welding with an end plate with a cross-shaped joint protrusion protruding from its surface, and a square pipe into which the joint protrusion is inserted. a pair of side frames each having a locking hole formed in the middle portion thereof to lock the square pipe by rotating it; an upper frame attached to the upper end side of the side frame; and an upper frame attached to the lower end side of the side frame. and a lower frame, and a drain hole is formed so as to straddle the lower side of the opening edge at both ends of the square pipe and the edge of the end plate opposite thereto. It has an effect.

In other words, since the drain hole was formed to span the lower side of the opening edge at both ends of the square pipe and the edge of the end plate opposite to this, even if water entered the square pipe, it could be drained reliably. This prevents square pipes from bursting due to freezing. Moreover, the strength of the square pipe is hardly reduced by the water drain hole, and the square pipe can be easily attached to the side frame by locking the cross-shaped joint protrusion into the locking hole. assembly becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of this invention, Fig. 2 is an exploded perspective view of the pipe joint, Fig. 3 is an exploded perspective view, Fig. 4 is a sectional view of the connected state, and Fig. 5 is an exploded perspective view of the pipe joint. FIG. 6 is an enlarged side view of the joint protrusion, and FIG. 6 is a front view thereof. 2... Square pipe, 3... Drain hole, 4... End plate, 5... Joint protrusion, 8... Side frame, 9... Locking hole, 10... Upper frame, 11... Lower frame.

Claims (1)

[Scope of utility model registration request] A square pipe serving as a middle crosspiece having both ends closed by partial welding with an end plate having a cross-shaped joint protrusion protruding from its surface, and the square pipe is locked by inserting the joint protrusion and rotating the square pipe. A pair of side frames having a locking hole formed in the middle part, an upper frame attached to the upper end side of the side frames, and a lower frame attached to the lower end side of the side frames, A door frame characterized in that a drain hole is formed so as to span the lower side of the opening edges at both ends and the edge of the end plate opposite thereto.