JPH058393Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a reinforcing structure for a duct with flanges.

<Problems that this invention aims to solve> Conventional duct connections are made by welding cut L-shaped angle pieces to form a rectangular frame-shaped flange, which is then fitted into the open end of the duct to connect it to the duct. However, forming such duct connections requires many skilled steps and is still prone to thermal distortion during welding and tensile deformation due to rivets. There was a problem that this occurred. This invention was originally proposed by the applicant in 1983.
This document attempts to solve this problem with a structure different from that of No. 17588.

<Structure of the invention> The present invention has a bent edge and an end face for hanging by folding back the bent edge by sandwiching a concave groove with a protrusion or hooked stepped surface at the opening side end of each side plate constituting the duct. A plate flange is formed by folding the plate flange, and an inner bent piece and an outer inclined piece are provided at the inner middle part of each plate flange, and a reinforcing plate formed at approximately the same height as the plate flange is attached to the contact surface. The inner bent end of the reinforcing plate is inserted into the reinforcing plate, and one end of the reinforcing plate is abutted against the protrusion or hooked stepped surface, and the end of the outer inclined piece is held down by the end face for latching. The main feature is the reinforced structure of the duct with a plate flange.

<Example> Examples will be described below based on the drawings.

The duct 1 forms plate flanges 2 at both ends of the opening side by folding up each side plate constituting the duct 1. In each case, the plate flange 2 has a bent edge 2b bent at a right angle toward the duct 1 from the outer end of the main plate portion 2a,
Further, the tip of the bent edge 2b is folded back inward to form a hooking end surface 2c at an intermediate position on the inner side of the bent edge 2b. Each side plate of the duct 1 has a protrusion 1a or a hooked stepped surface 1 parallel to the main plate part 2a of the plate flange.
A concave groove is formed.

The reinforcing plate 3 has a band plate part 3a that is in contact with the plate flange 2, and an inner folded part that is fixed by bending one long edge of the band plate part 3a at right angles and abutting against the protrusion or hooked stepped surface 1a. The curved piece 3b and the long edge on the other side are bent at an angle and are held down by the end face 2c for hanging.An outer inclined edge 3c
The duct 1 and the plate flange 2 are fitted from the open side between the bent edges 2b of the plate flange 2 in the manner shown in FIG. 6AB.

5A to 5D show the state in which the reinforcing plate 3 is fitted and attached, and FIG. 5A shows the protrusion 1a provided on the duct 1 as well as the tip of the bent edge of the plate flange 2. The end surface of the inner bent piece 3b of the reinforcing plate 3 was abutted and fixed between the end face 2c for hanging which was folded and inclined in the direction of the bent edge 2b, and the end of the outer inclined piece 3c was held down. An example is shown in FIG. 5B, and FIG.
An example is shown in which the inner bent piece 3b is fitted in a concave groove with a hooked step surface 1a instead of the protrusion 1a in Figure A,
FIG. 5D shows the outer inclined piece 3 at the hooking end surface 2c formed by parallel folding in FIG. 5B in FIG. 5C.
An example is shown in which c is held down.

Since the reinforcing plate 3 is provided with an inner bent piece 3b and an outer bent piece 3c, the rib action prevents warping or distortion in the longitudinal direction even if a relatively thin steel plate (0.8 to 1.2 mm) is used. As shown in FIG. It also serves to prevent the bent edge 2b from being bent inward due to external pressure.

An L-shaped corner member 4 having a folded short edge 4b and an inclined edge 4c is fitted over both end portions of the plate flange 2 to which the reinforcing plate 3 is not attached.

<Effects of the invention> As described above, the present invention forms a folded plate flange at the open end of each side plate constituting the duct, with a concave groove with a protrusion or hooked stepped surface sandwiched therebetween. This has the effect of eliminating the thermal distortion caused by welding and tensile deformation caused by riveting, etc. for attaching to the duct, which conventionally occur when forming the flange, resulting in accurate and deformation-free duct connections. arise.

In addition, reinforcement is provided with an inner bent piece that rests on the protrusion or hooked stepped surface of the duct provided in the plate flange, and an outer inclined piece that is held down on the end face for latching provided on the plate flange. Since the plate is fitted into the contact surface, attachment work is possible and easy at any time, and it does not fall off unnecessarily after attachment.Furthermore, the outer inclined piece fits in the way that supports the bent edge, so there is no need to apply external pressure. This has the effect that the shape of the bent edge, which is easily exposed to impact, can be strengthened as much as possible.

In addition, the protrusions or grooves with hooked stepped surfaces provided on each side plate constituting the duct, the bent edge provided on the side plate flange, the folded portion at the tip of the bent edge, and the end surface for hanging are provided respectively. A rib effect is imparted to the duct and the flap flange, thereby producing the effect of reinforcing and strengthening the duct and the flap flange.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a duct with a plate flange attached with a reinforcing plate, Fig. 2 is a perspective view showing the attachment position of the reinforcing plate, Fig. 3 is a perspective view of an enlarged part of the reinforcing plate, and Fig. 4
The figure is a vertical cross-sectional view with the L-shaped corner member inserted, the fifth
Figures A to 5D are vertical cross-sectional views showing the reinforcing plate attached to the side plate flange, Figure 6 AB is a vertical cross-sectional view showing the reinforcing plate being inserted, and Figure 7 is the outer inclined piece. Fig. 8 is a perspective view showing the L-shaped corner member;
1 is a duct, 1a is a protrusion or hooked stepped surface, 2 is a plate flange, 3 is a reinforcing plate, 3a is a main plate part, 3b
3 is an inner bent piece, 3c is an outer inclined piece, and 4 is an L-shaped corner member.

Claims (1)

[Scope of utility model registration request] A plate flange is provided at the opening side end of each side plate constituting the duct, with a protrusion or a concave groove with a hooked step surface sandwiched therebetween, and a bent edge and an end surface for hanging by folding back the bent edge. Each plate flange is formed by folding, and each plate flange is provided with an inner bent piece and an outer inclined piece at the middle part of the inner side, and a reinforcing plate formed at approximately the same height as the plate flange is fitted in contact with the inner side of the reinforcing plate. With a plate flange, one bent end is abutted against the protrusion or the hooked stepped surface, and the end of the outer inclined piece is held down by the end face for hooking. Duct reinforcement structure.