JP2501851Y2 - Ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a main frame of a ventilation fan.

[Prior Art] In a ventilation fan in which an oil receiving grill is mounted on the front surface of a sheet metal square tube-shaped main body frame, the operation switch is conventionally mounted on the front corner of the main body frame also as a reinforcement of the main body frame. It is attached to the metal fittings. A holding metal fitting having a holding structure for hanging the oil receiving grill is also attached to the front surface of the main body frame, and the main body frame made of sheet metal is reinforced by the above-mentioned mounting metal fittings and holding metal fittings. These metal fittings are made of steel plate, and so far, as is well known, one side has a slit, and the other side has a cut-and-raised part that can be inserted into this slit.The cut-and-raised part is inserted into the slit and the cut-and-raised part is bent and crimped. It is installed in.

Since the above-mentioned mounting method is simple, it is widely used for mounting parts.

[Problems to be Solved by the Invention] In the conventional ventilation fan described above, the mounting portions of the mounting brackets and the retaining brackets with the main body frame are not flat, and a protruding portion due to cutting and raising is formed, so that the appearance is not good. Also, when mounting parts such as switches on the relevant part,
There must be a relief for the protruding part on the part side,
Further, when there is a protruding portion on the back side, there is a problem in that when the ventilation fan is attached, the contact with the wall surface cannot be measured and a gap is formed.

This invention was made in order to solve such a conventional problem, and can strengthen the strength of the main body frame, easy to install parts such as operation switches, and there is no gap between the wall surface of the mounting location and the main body frame. The purpose is to obtain a ventilation fan with a good appearance that cannot be obtained.

[Means for Solving the Problems] In the ventilation fan according to the present invention, a reinforcing plate made of a steel plate including switch mounting plates and the like is provided at each of four corners on the front surface of the main body frame, and the reinforcing plate has a wall thickness on the main body frame side. A slightly wider slit is formed in several places, and the cut-and-raised pieces that correspond to the slits and can be individually inserted into these are formed on the reinforcing plate side, and the cut-and-raised pieces are cut and raised. Make an opening that is wider than the flat area of the raised piece, cut the body frame and the reinforcing plate into slits, insert the pieces up, and stack them together. The raised pieces are polymerized and the parts are joined and fixed in a planar configuration on the front and back.

[Operation] In the present invention, the portion of the main body frame corresponding to the opening portion of each reinforcing plate is depressed into each opening portion of the reinforcing plate to close each opening portion of the reinforcing plate and reinforce each concave portion of the main body frame. The cut-and-raised pieces of the plate are superposed, and the main body frame and each reinforcing plate are joined and integrated with a thickness equal to their total plate thickness, and the main body frame, each reinforcing plate, and the joint part are both front and back. Become a plane.

[Embodiment] FIG. 1 shows a main frame 1 of a ventilation fan as an embodiment of the present invention. The main body frame 1 is a frame body made of sheet metal and formed in a rectangular tube shape. An opening / closing shutter is attached to the opening on the back side, and an oil receiving grill with an orifice is attached to the front side. Is assembled. The front portion of the main body frame 1 projects outward in the shape of a flange, and the edges of each of the four sides thereof are bent forward to form a curved shape as a holding edge portion 2 that functions when the oil receiving grill is fitted. There is. Four corners of the flange-like projecting portion of the main body frame 1 are separated, but four reinforcing plates 3 made of steel plates that join the separated corners and connect the flange-shaped parts are joined. It is fixed and is essentially a series of frame structures. The upper two of the reinforcing plates 3 are configured as metal fittings having a hook-shaped holding portion 4 for hanging the oil receiving grill, and one of them is also a mounting base of a mechanism for opening and closing the opening / closing shutter. Further, the lower two also serve as component mounting metal fittings such as operating switches and unit components of the opening / closing mechanism of the opening / closing shutter, and corresponding notches, slits or holes for screwing are appropriately formed. Each of the reinforcing plates 3 and the main body frame 1 is fixed to both the front and back of the joint by a joining method that does not allow unevenness. That is, each reinforcing plate 3 and body frame 1
And are joined in the manner shown in FIG.
In FIG. 2, the body frame 1 and the reinforcing plates 3 have the same plate thickness or the latter plate is slightly thicker.

When joining the main body frame 1 and each reinforcing plate 3,
First, the main body frame 1 is provided with slits 5 that are slightly wider (about 0.5 mm) than the thickness of each reinforcing plate 3 at the portions to be joined. On the other hand, a cut-and-raised piece 6 that can be inserted into the slit 5 is cut and raised in each reinforcing plate 3 at a position where it should be joined, and the cut-and-raised piece 6 is cut and raised in a larger area than the plane area of the cut and raised piece 6. The raised piece 6 has an opening 7 having a similar shape.

Generally, the opening portion 7 of each of the reinforcing plates 3 is formed in a shape similar to the cut-and-raised piece 6 by cutting and raising the cut-and-raised piece 6 with a slit having a width dimension approximately three times the plate thickness of the main body frame 1. However, if the bending rigidity of the main body frame 1 is low, the width of the slit may be smaller.
When the bending rigidity of the main body frame 1 is high, the width of the slit is made larger than the above. It should be noted that the shape of the cut and raised piece 6 should be a rectangle without corners or a trapezoid, and the edge should be processed.

After the slit 5 is cut in each reinforcing plate 3 in the main body frame 1 to form the piece 6 and the opening portion 7 as described above, the main body frame 1 and each reinforcing plate 3 are cut at a substantially right angle. The raised pieces 6 are inserted into the slits 5 and overlapped with each other (see a in FIG. 2 and FIG. 3). Subsequently, the cut-and-raised pieces 6 protruding onto the main body frame 1 are pressed and bent to the opening portion 7 side of each reinforcing plate 3 by using a pressing device (see B in FIG. 2), and the main body is inserted into the opening portion 7. Frame 1
While the portion corresponding to the opening portion 7 is depressed, the cut-and-raised piece 6 is overlapped and caulked in the depressed portion to join the front and back sides together in a plane configuration (see FIG. 2C and FIG. 4).

Then, the main body frame 1 and the respective reinforcing plates 3 are depressed on the main body frame 1 side into the opening portions 7 on the respective reinforcing plate 3 sides, the respective reinforcing plates 3 are cut and raised, and the pieces 6 are opened portions 7 of the slits 5 of the main body frame 1. The edge portion on the side is pushed in to join the body frame 1 in the form of a tongue-shaped joint portion in which a recessed portion of the body frame 1 is hard to be depressed. The thickness of the joining portion is equal to the total thickness of the main body frame 1 and each reinforcing plate 3, and both the front and back sides are finished as flat flat surfaces. Therefore, there is no unevenness on the front surface of each reinforcing plate 3 for mounting parts such as an operation switch or for providing a relief, and the main frame 1 of the body frame 1 that will hit the wall surface of the mounting location of the ventilation fan. There is no unevenness on the back surface of the flange-like part that creates a gap during mounting. Then, the main body frame 1 itself is reinforced by the reinforcing plate 3 whose four corners are integrally joined and fixed, and the strength is enhanced.

[Effects of the Invention] As is apparent from the above description of the embodiments, the ventilation fan of the present invention has steel plate reinforcing plates including switch mounting plates at the four corners of the front surface of the main body frame, and the main body frame side is provided with Slits that are slightly wider than the thickness of the reinforcing plate are formed at several places, and the reinforcing plate side cuts and raises the cut-and-raised pieces that correspond to the slits and can be individually inserted into these, and cut and raised pieces are cut. The raised portion is formed as an opening portion wider than the plane area of the cut and raised piece, the body frame and the reinforcing plate are cut and raised in the slits, the pieces are inserted and overlapped, and the cut and raised piece is added to the opening portion side. Since the cut-and-raised pieces are overlapped by pressing and bending, and the relevant parts are joined and fixed in a planar configuration on both the front and back sides, the portion of the main frame corresponding to the opening of each reinforcing plate is the opening of each reinforcing plate. Of the reinforcement plate to close each opening of the reinforcement plate, each cut-and-raised piece of the reinforcement plate overlaps with each depression of the main body frame, and the main body frame and each reinforcement plate have a thickness equal to their total thickness. As a result of being joined and integrated, the joint portion between the main body frame and each reinforcing plate becomes flat on both the front and back sides. Therefore, the strength of the main body frame is increased, components such as the operation switch are easily mounted on the reinforcing plate, no gap is formed between the wall surface of the mounting location and the main body frame, and the appearance is also good.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main body frame of a ventilation fan according to an embodiment of the present invention, and FIGS. 2, 3, and 4 are explanations showing how to join the respective reinforcing plates to the main body frame. It is a figure. In the figure, 1 is a main body frame, 3 is a reinforcing plate, 5 is a slit, 6 is a cut-and-raised piece, and 7 is an opening. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

(57) [Scope of utility model registration request] A reinforcing plate made of a steel plate including a switch mounting plate and a holding metal having a holding structure for an oil receiving grill is provided at each of four corners on a front surface of a sheet metal square tubular main body frame, and the main body frame side is provided with the reinforcing plate. It is formed in several slits that are slightly wider than the thickness of the reinforcing plate, and on the reinforcing plate side, cut-and-raised pieces that correspond to the slits and can be individually inserted into them are cut-and-raised. The cut-and-raised piece is formed into an opening portion wider than the plane area of the cut-and-raised piece, the body frame and the reinforcing plate are cut and raised in the slits, the pieces are inserted and overlapped, and the cut-and-raised piece is pressed to the opening portion side. The ventilation fan is characterized in that it is bent and bent, and the cut-and-raised pieces are polymerized so that the front and back sides are joined and fixed in a planar configuration. 2. The ventilation fan according to claim 1, wherein the reinforcing plate is slightly thicker than the main body frame.