JPS5944842B2 - Enclosure door - restraint device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door restraining device for a housing such as a switchboard.

Generally, in a closed type switchboard, it is desired that the door always act in the closing direction h3 when the door is closed.

However, the conventional H3 models do not necessarily have this, and in many cases, the restraint when closing the door is maintained by the dead center of the mechanism or by balancing the dead center and the weight of the mechanical parts, so it is slightly Many of them have the drawback that even with strong vibrations, the door will open after a long period of time.

An example of this will be explained with reference to FIGS. 1 and 2.

This belongs to the latter category, and indicates the restrained state when the door is closed.

In the figure, a door 1 is hinged to a housing 2 of a switchboard on one side (not shown) and is rotatable.

A rotatably supported shaft 3h3 is provided approximately at the center of the other side of the door 1, and a bundle 4 for restraining the door is mounted on the front side of the door 1 (on the rear side t) of the shaft 3. A crank 5 is fitted respectively.

A claw 6 is provided perpendicularly to the crank 5, and through holes 5a and 5b are bored at both ends of the crank E.

The through hole 5at is rotatably connected to the upper rod 7a by a pin 8a, and the lower rod 7a is rotatably connected to the through hole 5b.
') It is rotatably connected by a pin 8b.

Each of the upper and lower side Rondo doors a and 7b has its end portion 7al,
7blhS Through holes 9a of guides 9 and 10 provided on the upper and lower back surfaces of the door 1, respectively.

10a and is freely movable in the axial direction.

The door restraint device with the above configuration is
, 7b and the tips 6abS of the claws 6 are applied to the rear surface of the front wall of the housing 2, and prevent the door 1 from moving in the direction P in FIG.

As is clear, the through hole 9a is closed when restrained.

5a, the shaft 3, and the through holes 5b and 10a are on a perpendicular straight line.

Therefore, since the through hole 5a is above the dead center with respect to the through hole 9a and the shaft 3, the weight of the upper rod 7a is arranged so that no force is generated to rotate the shaft 3 in the Q direction.

In addition, the rotational force of the claw 6 acting in the direction of the arrow Q is always applied in the opposite direction to the rotational force of the weight of the lower rod 7b in the direction of the arrow 13sQ, and with sufficient margin, making it even more stable. So that restraint retention can be obtained (this is done).

However, in reality, due to the accuracy of machining and installation of component parts, the dead center formation during closing was not sufficient, and the bundle 4 was not rotated to the dead center position reliably when closing, so even a slight vibration could cause damage for a long time. In some cases, the shaft 3 rotates in the Q-direction, causing the upper and lower-side rods 7 a t 7 b fh and the pawl 6 to move to the state shown by the chain line, causing the door 1 to open.

This is especially the case with tall switchboards.

In consideration of operability, the height H of the bundle is fixed regardless of the height of the switchboard, and if the height of the switchboard is large, the upper rod will be longer, which means the weight will increase. This is because the rotational force in the Q direction increases when the dead center shifts.

As a means to eliminate the above-mentioned drawbacks, it is necessary to improve the accuracy of the processing and installation of the above-mentioned component parts.
3s, which occupies a large part of it, is not a good idea to improve the mounting accuracy because it is a sheet metal processed product and there are many different thicknesses, which leads to a large increase in costs. Another means b3 was desired.

It is an object of the present invention to provide an inexpensive door restraint device that eliminates the above-mentioned conventional drawbacks and provides stable holding h3 when the door is closed.

According to the present invention, the above-mentioned objects include a door hinged to the front surface of a housing, a bundle for restraining the door rotatably attached to the front surface of the door opposite to the hinge, and a shaft end of the bundle protruding from the rear surface of the door. A door restraint device f for a housing consisting of a crank attached to the crank, an upper rod and a lower rod that are each hinged to the crank and are slidably supported in the vertical direction and that are locked to the rear surface of the front wall at the top and bottom of the housing. Here, the crank, the upper rod and f
Js, so that the crank is always biased in the door restraining direction by the weight of the upper rod and the connecting frame through a connecting frame that runs vertically away from the vertical axes of the upper and lower rods in the door restraining state. This can be achieved by providing a stop collar 13s on the door itself, which prevents the crank from rotating beyond the door locking position.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 3i and 4 show an embodiment of the present invention, and show the restraint state when the door is closed, similar to the conventional example shown in FIGS. 1 and 2.

The door 11 is hinged to the casing 2 of the electrical protection panel on one side (not shown) and is rotatable.

On the other side of the door 11, there is provided a rotatably supported shaft 3 similar to that shown in FIG. One crank 12h3 is fitted respectively.

The crank 12 is provided with a through hole 12b that connects the lower rod 13b with the pin 8b, and a through hole 12c at a position where the rotation distance is larger than that of the through hole 12b (with respect to the shaft 3). A claw 563 is provided so as to be perpendicular to a line connecting the axis with the through hole 12b.

The upper side surface of the pawl 6 abuts against a stopper 14 to prevent rotation of the shaft 3 in the R direction.

A shaft 15 attached above the shaft support point of the shaft 3 of the door 11
Another rotatable crank 16 is inserted into the holder.

The crank 16i is a through hole 1 provided in the crank 12.
Through holes 16a and 16b are provided corresponding to 2b and 12c4, respectively, and have the same radius of rotation with respect to the axis.

The upper rod 13a is rotatably connected to the through hole 16a by a 6S pin 8a, and the connecting frame 1 whose one end is connected to the through hole 12c by a pin 8c is connected to the through hole 16b.
The other end of 7 is connected via a pin 8d.

The upper and lower rods 13a and 13b each have their ends 13
a1°13b1 are loosely fitted into through holes 9a and 10a of guides 9 and 10 provided on the upper and lower rear surfaces of the door 11, respectively, and are movable in the axial direction.

Kite 181 with connecting frame 17 and door 111 attached
It is supported so as to be movable in the vertical direction.

The above configuration 1 constitutes the door restraint device as shown in FIGS. 1 and 2 above.
As in the case shown in the figure, the ends 13a1, 13b1 of the upper and lower rods 13a, 13b and the tip 6a of the claw 6 hang on the back side of the front wall of the casing 2, and the door 11 moves in the T direction in Fig. 4. is being prevented.

When restrained, as shown in the figure (this upper rod 13
The connection between a and the crank 12 is the crank 16 and the connecting frame 11
In addition, both cranks 1 of the connecting frame 17 are
2. By making the rotation radius of the connection point on 16 large, when the door 11 is locked (even if the weight of the connecting frame 11 is the same as the weight of the upper rod 13a, the rotation radius ratio is Accordingly, a rotational force in the U direction will always act.

In other words, the upper rod 13a is acting as a force h3 in the direction of pushing it upward.

Further, this also acts as a pressing force on the lower rod 13b via the single crank 12.

Further (these things are done by turning the handle 4 bis forward (
This rotation causes the upper rod 13a and the crank 16. The same thing can be said h3 when the crank 12 and the lower rod 13b are in a release state for opening the door 11, which is indicated by a chain line.

Therefore, both the upper and lower rods 13a, 13b and the pawl 6 are always biased toward the restrained state over the entire range from opening to closing of the handle, so that stable restraint can be maintained even when there is vibration during restraint and an uncertain handle position. h3 What you can get.

[Brief explanation of the drawing]

FIG. 1 is a rear view showing an example of a conventional door restraint device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a rear view showing an example of a conventional door restraint device. Rear view,
FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3. 2... Housing, 3, 15... Axis, 4...
...Handle, 8a, 8b, 8c
, 8 d...---pin, 9,10°18...
... Guide, 12, 16 ... Crank, 9a
. 10a, 12b, 12c*16a, 16b...Continuous through hole, 14...Stopper, 17...Connection frame.

Claims (1)

[Claims] 1. A door hinged to the front surface of the housing, a door restraint bundle rotatably attached to the front surface of the door opposite to the hinge, a crank attached to the shaft end of the bundle protruding from the rear surface of the door, In a door restraint device for a housing, the housing door restraint device includes an upper rod and a lower rod that are each hinged to the crank and are slidably supported in the vertical direction and that are engaged with the rear surface of the front wall at the top and bottom of the housing. h3 When the door is restrained in the down position, the crank f)S will be constantly biased in the door restraint holding direction by the weight of the connecting frame through the connecting frame that runs vertically away from the vertical axes of the upper and lower rods. 3. A door restraint device for a housing, characterized in that the door is connected to a stopper that prevents the crank from rotating beyond a door restraint position.