JPH0252073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door opening/closing device for closing a front opening of a refrigerator body or the like.

Conventionally, in order to make the door close when the door is opened, there are devices that twist the coil spring when the door is opened to make it close, and methods that force the door to close by pulling the spring. There was something like that.

However, since both of these systems only rely on the force of the spring, the coil springs that have deteriorated over long periods of use may break due to twisting, and the more you open the door, the stronger the spring force becomes, requiring more force to open the door. It had some drawbacks.

An object of the present invention is to provide a door opening/closing device that improves the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a box having an opening for a refrigerator or the like, and a door 2 is provided in front of the opening. The door 2 is pivotally supported on the box body 1 at the upper and lower ends of one side by door support members 3 and 4, and is attached to the box body 1 so as to be openable and closable. The one door support member 3 has a hinge pin 5 erected thereon.
Reference numeral 6 denotes a control device that always urges the door 2 in the closing direction, and is installed inside the door 2. The control device 6 includes a housing cylinder 7, a first locking member 8, a second locking member 9, a coil spring 10, and a locking body 11. The housing tube 7 extends vertically and integrally has a cylindrical portion 12 at the bottom and a rectangular cylindrical portion 13 at the top. Further, the housing cylinder 7 is located above the door support member 3 and is attached to the door 2 with screws (not shown) so as to be aligned with the hinge pin 5 and the hole 13' of the door 2. The first locking member 8 is formed in a cylindrical shape, and has a square hole 14 formed at its lower end to receive the prismatic hinge pin 5, an inclined cam surface 15 at its upper end, and a flat portion at the tip and rear end of the cam surface. 16 and 17. And this first
The locking member 8 is rotatably housed in the cylindrical portion 12 of the housing cylinder 7. Further, the second locking member 9 includes a prismatic portion 18 and a cylindrical portion 19, and a hole 20 is formed in the upper surface of the prismatic portion 18 to receive a portion of the coil spring 10. Further, at the lower end of the cylindrical portion 19, an inclined cam surface 21 having the same angle as the inclined cam surface 15 of the first locking member 8 is formed, and flat portions 22 and 23 are formed at the tip and rear ends thereof. ing. And the prismatic portion 1 of the second locking member 9
8 is provided in the rectangular cylinder part 13 of the housing cylinder 7 so as to be able to slide up and down, and the cylindrical part 19 is connected to the inclined cam surface 15 of the first locking member 8 and the inclined cam surface 2 within the cylindrical part 12.
1. This second locking member 9 is connected to the first locking member 8 by a coil spring 10.
The locking body 11 is attached to a groove 24 formed in the upper part of the housing cylinder 7 so as to be pressed to the side, and the coil spring 10 is compressed.

Then, the inclined cam surface 15 of the first locking member 8 and the second
The setting is such that the door 2 closes the opening when the inclined cam surface 21 of the locking member 9 is not in the same state, but when the inclined cam surface 21 is slightly on top of the inclined cam surface 15. Good. The reason for this is to improve the sealing performance when the door 2 is closed by keeping the door 2 tightly closed.

To explain the operation in something like this,
When the door 2 is opened, the housing tube 7 also rotates relative to the hinge pin 5. The rotation of the housing cylinder 7 means that the second locking member 9 is rotated, and the second locking member 9 is rotated.
The inclined cam surface 21 of the locking member 9 comes into contact with the sloped cam surface 15 of the first locking member 8 and slides upward on the square tube portion 13, that is, the sloped cam 21 rides on the sloped cam surface 15. When the door 2 is released from the door 2 at that position, the force of the coil spring 10 causes the door 2 to be rotated in the tightening direction. Also, door 2
When opened, the flat end portion 16 of the first locking member 8 and the flat end portion 22 of the second locking member 9 come into contact, and the door 2, which had been tightened until now, stops at that position. It is something to do.

In this way, the contact relationship between the inclined cam surfaces 15 and 21 of the first locking member 8 and the second locking member 9 biases the door 2 in the direction of closing, so there is no need to close the door 2 and the angle is fixed at a predetermined angle. When it is opened, it does not become tight, so it is easy to operate the box 1 and take things in and out. Furthermore, although the second locking member 9 is pressed toward the first locking member 8 by the coil spring 10, it applies a force perpendicular to the opening direction. This eliminates the drawbacks of the paper being heavy and difficult to open. Furthermore, since the control device 6 is provided inside the door 2, it will not become inoperable due to dirt or dust, and the mounting position on the door 2 can be either upward or downward, so there are no restrictions.

As is clear from the above embodiments, the door opening/closing device of the present invention is provided with a first locking member having an inclined cam surface formed at the upper end on the hinge pin of the control device, and the door side contacts the inclined cam surface, A second locking member having an inclined cam surface along the same cam surface is provided to slide vertically, and the second locking member is pressed against the first locking member by a coil spring. When the door is opened, both inclined cam surfaces are brought into contact with each other while the second locking member is slid upward, so when the door is released, it automatically moves in the closing direction along the inclined cam surfaces. It is something that is tightening.

In addition, the force of the coil spring does not act in the direction of rotation of the door, but in the direction perpendicular to the direction of rotation, so a uniform force is applied.
This does not have the drawback that the larger the opening angle of the door, the stronger the coil spring force becomes, making it difficult to open. Also, since the force of the coil spring is acting on the shaft, the force is smaller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a box using a switchgear according to an embodiment of the present invention, FIG. 2 is a sectional view of the main part of FIG. 1, and FIG.
The figure is an exploded perspective view of the main part of Figure 2. DESCRIPTION OF SYMBOLS 1... Box body, 2... Door, 3, 4... Door support member, 5... Hinge pin, 6... Control device, 7...
Storage tube, 8... First locking member, 9... Second locking member, 10... Coil spring, 11... Locking body, 13... Square tube portion, 15... Inclined cam surface, 1
6, 17...Flat part, 18...Prismatic part, 21...
Inclined cam surface, 22, 23...flat portion.

Claims (1)

[Scope of Claims] 1. A box having an opening, a door that closes the opening of the box, a pair of upper and lower door support members that pivotally support one side of the door and are attached to the door so that it can be opened and closed; The control device includes a first locking member that engages with a hinge pin of the door support member and has an inclined cam surface at one end; a second locking member disposed on the same straight line as the first locking member and having an inclined cam surface along and in contact with the inclined cam surface of the first locking member; A storage cylinder that covers the outer periphery of the second locking member and has an engaging portion to prevent the second locking member from rotating independently and has a screw or the like attached to the door; A door opening/closing device formed by a coil spring that is brought into pressure contact with the side, and a locking body that attaches the coil spring to a housing cylinder so as to exert a compressive action. 2 The side opposite to the inclined cam surface of the second locking member is formed into a prismatic shape, and the engaging portion of the housing cylinder is also formed with a prismatic cylindrical portion that slidably receives the prismatic portion of the second locking member up and down. A door opening/closing device according to claim 1 of the utility model registration claim. 3. The door opening/closing device according to claim 1, wherein flat portions are formed at the tips of the inclined cam surfaces of the first locking member and the second locking member, respectively.