JPH02298783A - Door opening or closing device for refrigerator - Google Patents

Abstract

PURPOSE:To simplify an opening or closing device without requiring any additional pushing mechanism for use in pushing a door toward an opening by a method wherein a concave part for use in guiding the door at a refrigerator toward its opening and downward direction in case of closing the door is arranged at a linear member. CONSTITUTION:Under a condition in which a thermal insulating door 4 is fully closed, a wheel 42 for supporting a weight of the door is dropped into a concave part 21 of a rail (a linear part)11, resulting in that the door 4 is pushed against a floor surface and a front wall 2 of an opening 3 by its own weight and then a refrigerator 1 is sealingly closed with a packing 6. In case that the door 4 is opened, at first the wheel 42 is retracted from the concave part 21 with a driving device 31 along its slant sur face. The wheel 42 is moved forwardly and upwardly to move the packing 6 away from an edge of an opening 3 and a floor surface, a groove 47 of the wheel 42 is placed on a projection of the track 11 and then the wheel is run in an opening direction while a sliding surface 48 of the wheel 42 is rotationally contracted with a slant surface of the track 11. In this way, it is not necessary to provide an additional mechanism for pushing the door toward its opening direction, and further it is possible to simplify a structure of the device and to perform a smooth opening or closing of the door without any clatter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Application Field The present invention relates to a door opening/closing device disposed in a low-temperature storage such as a pull-hub refrigerator.

BACKGROUND OF THE INVENTION Conventionally, a doorway for loading and unloading articles formed in the front wall of a low-temperature refrigerator is opened and closed by lateral movement of a door body suspended via a plurality of rollers on a rail horizontally installed above the doorway in the front wall. Utility Model Publication No. 61-22127 as a switchgear for
There is a publication. In this opening/closing device, when the door is closed, the upper part of the door body is pressed against the front wall side by a crank lever.
The lower part of the door body is pressed against the wall surface by the clamp mechanism, and the gasket is pressed against the wall surface to eliminate the gap between the door body and the wall surface and seal it. On the other hand, when the door is opened, the pressure exerted by the crank lever or clamp mechanism is released, the seal is separated from the wall, the sliding resistance of the seal is eliminated, and the door body can easily move laterally. be. Note that the roller moves the door laterally by rolling on the horizontal portion of the rail.

Problems to be Solved by the Invention ゛In the above technology, a crank lever and a clamp mechanism are used to press the door body against the front wall side when the door body is closed. A member having restoring force, such as a spring, is attached as the clamp mechanism, and the door body is pressed against the front wall side against the restoring force of the spring. For this reason, the above-mentioned parts and peripheral parts are required to push the door in place, resulting in a complicated mechanism and a problem of a large number of parts. In addition, when applying this technology to a door with a backing attached to protrude from the bottom edge of the door and using this backing to bring the door into close contact with the floor, there is no mechanism for the door to drop downward when the door is closed. In this case, the door body has to move laterally while the backing remains in contact with the floor surface, resulting in a problem that it is difficult to slide the door body.

On the other hand, the rollers move on the horizontal part of the rail, and dirt, dust, and other impurities tend to accumulate on this horizontal part, obstructing the rotation of the rollers and making it difficult to move the door. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a door opening/closing device for a low-temperature refrigerator that has a simple structure and is capable of pressing the door against the front wall side and dropping the door downward.

[Structure of the invention]

Means for Solving the Problems The present invention includes a linear member and a wheel paired with the linear member, and one of the linear member and the wheel is attached to a fixture provided on one side wall of the cold storage refrigerator, and the other is attached to a fixture provided on one side wall of the cold storage refrigerator. A door opening/closing device for a low-temperature refrigerator is provided, which is attached to a mounting member provided on a door, and opens and closes an opening formed in the one side wall by lateral movement of the door, the wheels having an annular groove, a pair of annular walls forming the groove, and the linear member has a protrusion facing into the groove, and a pair of annular walls connected to the protrusion and having inward and outward slopes and in contact with the annular wall. It is provided with an inclined surface and a recessed portion that guides the door in the opening direction and in the downward direction when the door is closed.

Since the protrusion of the linear member faces the groove of the working wheel, and the annular wall forming the groove contacts the inclined surface connected to the protrusion, the protrusion acts to prevent the wheel from wobbling in the front-rear direction. In addition, since the linear member has an inclined surface, the slope of the inclined surface acts to guide dirt and dust downward, making it difficult to stay on the linear member.Furthermore, the contact surface between the wheel and the linear member is Only the annular wall portion is used to reduce the contact area between the wheel and the linear member, thereby reducing the sliding resistance between the wheel and the linear member. These factors work together to improve the running performance of the door.

EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 to 12.

Reference numeral 1 denotes a low-temperature storage such as a prefabricated refrigerator that forms a storage room with a main body having earthen walls and side walls by combining a plurality of heat insulating panels 2, and one side wall (the front wall in this example) is used for carrying goods. - An insulating door 4 is provided to form an opening 3 for carrying out and to open and close this opening 3 freely.

The heat insulating door is attached so as to be horizontally movable by the opening/closing device 5, and is slidably movable in the horizontal direction via a suspension device 41 on a track 11, which is a straight section installed horizontally above the opening 3. suspended in condition. A flexible backing is provided on the periphery of the inner surface of the door 4. This backing consists of a bag-shaped first backing 6 formed by extruding soft rubber and arranged on the upper side and left and right sides, and a door 4.
A second backing 7 is arranged so as to protrude below the lower end of the backing 7. P is the first value when door 4 is running.
This is the gap between the backing 6 and the front wall 2, and the relationship is such that P<A.

The second backing 7 is made of a soft material such as soft vinyl chloride or soft rubber, and has vertical fixing holes 8 formed at appropriate intervals in the lower or upper part thereof.The second backing 7 is made by folding the soft plate material 7B up and down to form a hollow shape. It is fixed with a blank presser 9 and screws 10. If the vertical hole 8 with a length of 2h is formed only in the lower part of the plate material 7B, the height adjustment amount will be h. The vertical holes 8 are formed in the plate material 7B in accordance with the mounting height of the track 11 and the adjustment state of the door mounting height adjustment section 45 attached to the suspension device 41. This is to make it work as a mounting state adjustment section for making slight adjustments to the mounting condition, and to make slight adjustments to increase or decrease the contact area with the floor surface Y. The second backing 7 has a hollow part that partially contacts the floor surface, and a mounting part T that is attached to the lower part of the door 4 and is in contact with or very close to each other. The hollow part K and the mounting part T may be formed by folding back the plate material.

A guide rail 19 is attached to the entire width of the lower end of the outer surface of the heat insulating door 4.
It has a protrusion 19B that protrudes downward from the lower end, and this protrusion 19B is inclined at an angle of approximately 45° toward the inside of the refrigerator.

31 is a drive device for automatically moving the heat insulating door 4 in the horizontal direction, and includes a drive unit 33 whose rotation direction and rotation speed can be controlled by signals from the controller 32, and a drive unit 33 that moves the rotational movement of the drive unit 33 horizontally. and a drive belt 34 that converts the direction into linear motion.

Reference numeral 12 denotes a fixture for horizontally installing a track 11 as a linear member above the opening 3 of the low-temperature refrigerator 1, and in this example, the case where the track 11 is operated to open the door in the right direction is shown.
The left end joint portion 13, the left rail portion 14, the intermediate joint portion 15, and the right rail portion 16 are connected in series to form a straight line, and the cross section thereof is approximately rectangular. It is attached to the fixture 12 so that the protrusion 17 where the two surfaces intersect is the apex, and these two surfaces form outward and inward inclined surfaces 18A and 18B at an angle of 45'' with respect to the horizontal plane, respectively. Further, the protrusion 17 faces into a groove 47 of the wheel 42, which will be described later, and the wheel 42 is allowed to travel with the inclined surfaces 18A and 18B in contact with the sliding surface 48. 20 is a track 11 These stoppers are attached to the left and right ends of the door, respectively, and define the lateral movement range of the door.

In addition, the wheels 42 are attached to each joint part 1 when the door is fully opened.
3.15, and is located on each rail portion 14.16 in the running state and in the fully open state. An example of each joint part is shown in FIGS. 7 to 10. When the door is moved manually, the recesses 21A and 22A shown by broken lines are used, and when the door is moved automatically, the gently sloped recess 21B is shown as a solid line. , 22B. Further, FIG. 10 shows an example in which recesses 22 and 23 with different inclinations are formed on opposing surfaces, respectively.

Reference numeral 51 denotes a pair of left and right guide parts that restrict the forward swing of the lower end of the suspended door 4 when the insulating door 4 moves horizontally.In this example, since the opening direction is the right side, the guide part 51A located on the right A steady rest 54 is installed to prevent the lower end of the door from swinging backwards. The guide part 51 consists of a fixed plate 52 fixed on the floor surface and a guide column 53 placed on the fixed plate. It is installed at an angle of 1°. Further, the steady rest 54 is arranged behind the guide column 53 with a distance sufficient to allow the guide rail 19 to run with a margin.

Here, the door opening/closing device 5 includes a suspension device 41 and a track 11,
It can be configured by a fixture 12 and a drive device 31.

Thermal insulation m 4 ty In order to create a mechanism that allows the door 4 to be pushed backward by a distance A and dropped downward by a distance B when fully closed, each joint part 13.15 has an inward slope and a downward slope spanning three sides. Concave portions 21 and 22 having a counter slope are formed, and the concave portions are arranged so as to face forward, and the connecting portion between each joint portion 13.15 and each rail portion 14.16 is the starting point. A recess is formed so that the lowest point is at the center of the portion 13.15 (see Figures 8 and 9), and the wheels escape from this recess 21, 22 to each rail portion 14.16. It is desirable to determine the angle of inclination of the indentation so that the required force when moving is as small as possible.

The suspension device 41 includes a mounting member 44 having a shaft body 43 that is fixed to the left and right upper ends of the door 4 and rotatably supports the wheels 42 in the vertical direction, and is rotatably supported with respect to the shaft body 43.
It is provided with wheels 42 that move horizontally on the track 11, and a mounting height adjusting section 45 such as a bolt that slightly adjusts the mounting position of the shaft body 43 relative to the mounting member 44 in the vertical direction. The wheel 42 has an annular groove 47 facing the protrusion 17 on the track 11, and an annular wall 48 formed in an annular shape with an inward inclination of 45'' when a part of the groove 47 is viewed from the side of the wheel. The annular wall 48 serves as a sliding surface, and is formed of hard resin in a substantially pincushion shape.

Reference numeral 60 denotes an operating joint for operating the heat insulating door 4 in accordance with the linear movement of the drive belt 34;
4, and an actuating plate 62 that is attached to the fixing rod 61 at one end and to the drive belt 34 at the other end.

Next, the sliding movement of the door 4 will be explained. ■ When the door is fully closed, the wheels 42 are moved to each joint 1 of the track 11.
It got stuck in the recesses 21 and 22 of No. 3 and 15, and was pushed backward by the distance A on the inward slope, that is, toward the front wall of the low temperature refrigerator 1, and was dropped downward by the distance B on the downward slope. The first backing 6 is held in this state, the first backing 6 is in contact with the opening edge, the second backing 7 is in contact with the floor surface Y,
The low-temperature refrigerator 1 is hermetically sealed with no gap between the door 4 and the edge of the opening.

(2) To put the door 4 into a running state, the wheels 42 are first moved out of the recesses 21 and 22 by applying an external force to the door 4 (in this example, a rightward driving force by the drive device 31). In escaping from this recess 21, 22, the wheel 42 gradually moves forward and upward along the slope of the recess, and the first
The second backing 6 is separated from the opening edge, and the second backing 7 is separated from the floor surface. When the wheels 42 escape from the recesses 21 and 22, their grooves 47 are placed on the protrusions 17 of the respective rails 14 and 16.

■If a force is applied to the door in the right direction while the wheels 42 are placed on each rail section 14, 16, the sliding surface 48 of the wheel 42 will touch the protrusion 17 of each rail section 14, 16. The door 4 rotates while contacting the sandwiching inclined surfaces 18A and 18B, and the wheels 42 run on the respective rail portions 14 and 16, causing the door 4 to run in the opening direction.

Note that the protrusion 17 faces the groove 47 of the wheel 42, and the sliding surface 48
are in contact with the inclined surfaces 18A, 18B, so that the wheel 42 is prevented from shaking in the front-rear direction, and the wheel 42 is moved against the rail portion 14.
16 can be transferred with good linearity. At this time, the first and second backings 6.7 are connected to the opening edge and the floor surface Y.
Since the sliding resistance of the door 4 is small, dirt hardly accumulates on the sloped surfaces 18A and 18B of each rail part, and the contact area between the wheels 42 and the rail part 14.16 is small. Therefore, the door 4 can be opened with a much smaller force than when the recesses 21 and 22 are escaped.

In order to move the door 4 in the closing direction, it is sufficient to apply a force to the left on the door, and by taking the reverse stroke of the above-mentioned strokes from ■ to ■, that is, the stroke of ■→■→■, Confession degree 3 is sealed at 4.

In addition, in the state of ■, the second backing 7 is attached to the wheel 42.
When the door 4 falls into the recesses 21 and 22, it is pressed against the floor surface Y and the front wall 2 by its own weight, and is crushed and deformed due to its flexibility, and comes into close contact with the floor surface Y and the front wall 2. It happens. At this time, the second backing 7 is easy to bend because the plate material is folded back to form a hollow part, and the contact area can be easily increased, so that the adhesion as a backing can be improved.

Furthermore, since the vertically elongated hole 8 is formed in the soft plate material 7B,
The folding position can be finely adjusted, and the contact area with the floor and front wall can be finely adjusted.

Although the example in which wheels are disposed on the door side and tracks are disposed on the front wall side has been shown above, FIG. 12 shows an example in which the linear member C is disposed on the door side and the wheels S are disposed on the front wall side.

In this case, the length of the straight member C may be approximately the width of the door, but
At least three wheels S are required.

〔Effect of the invention〕

As detailed above, according to the present invention, by providing the linear member itself with a recessed portion that guides the door in the opening direction and downward direction,
The opening/closing device can be simplified without separately preparing a pressing mechanism for pressing the door in the opening direction. In addition, since the intersection of the two sides of the straight member faces into the groove of the wheel, it is difficult for dirt and dust to accumulate on the straight member.
Because the annular wall of the wheel is in contact with these two surfaces, the wheel is prevented from shaking in the front and back direction with respect to the linear member, and the rotation of the wheel is not hindered, and the straightness of the door is good, making the door smooth. Can be moved laterally. In addition, by making a part of the groove an annular wall with an inward slope and forming a sliding surface, the contact area between the linear member and the wheel can be reduced, allowing the door to move laterally. The door can be moved with less force by reducing the resistance when moving the door.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG. 1 is a side view of the top of the hot water bath with the wheels dropped into the recess, FIG. 2 is a side view of the top of the hot water bath with the wheels in the running position, and FIG. The figure is a perspective view of the low-temperature refrigerator, Figure 4 is a schematic perspective view of the door opening/closing device, Figure 5 is a perspective view of the lower part of the door, Figure 6 is a side view of the lower part of the door in the fully closed state, and Figure 7 is the track. Figures 8 and 9 are perspective views of the joint, Figure 10 is a side view of the joint, and Figure 1 is a side view of the joint.
1 is a perspective view of the guide section, and FIG. 12 is a view corresponding to FIG. 2 showing another embodiment. 1...Low temperature storage, 3...Opening, 4...Insulated door,
5... Door opening/closing device, 11... Track (straight member), 12... Fixture, 17... Projection, 18
A, 18B... Slanted surface, 21.22... Concave portion,
41... Suspension device, 42... Wheel, 43...
・Shaft, 44... Mounting member, 47... Groove,
, 48... annular wall (sliding surface).

Claims (1)

[Claims] 1. A linear member and a wheel paired with the linear member,
Either one of the linear member and the wheel is attached to a fixture provided on one side wall of the low temperature refrigerator, and the other is attached to a mounting member provided on the door, and an opening is formed in the one side wall by lateral movement of the door. In a door opening/closing device for a low-temperature refrigerator that opens and closes, the wheel has an annular groove and a pair of annular walls forming the groove, and the linear member has a protrusion facing into the groove;
The door is characterized by being provided with a pair of inclined surfaces connected to the protrusion and having inward and outward inclinations and in contact with the annular wall, and a recessed portion that guides the door in the opening direction and downward direction when the door is closed. Door opening/closing device for low temperature storage.