JPH0437911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a door locking device for a sliding door, and specifically, it is used for a sliding door for opening and closing the entrances and exits of large refrigerators, freezers, and the like.

[Conventional technology]

The sliding door of a large refrigerator, etc. is movably suspended via rollers on a guide rail installed above the front plate of the entrance, and moves back and forth in a straight line to open and close the entrance. As an example, a fastener such as that disclosed in Utility Model Application Publication No. 59-188267 has been provided.

In this method, a rotating body with two actuating claws protruding from one side at appropriate intervals is pivotally mounted on a base plate, and this rotating body is switched and pulled by a compressible spring. It is fixed almost in the center of the upper end surface,
Normally, this operating pawl projects toward the front plate of the opening of the freezer, etc., and on this front plate, an engagement plate consisting of an inclined protrusion that protrudes toward the sliding door and a continuous protrusion is placed in a predetermined position. It is fixed.

In this fastener, when the sliding door is moved in the closing direction, one of the actuating claws comes into contact with the inclined protrusion of the engagement plate and is pressed, and the rotating body rotates against the elasticity of the compressible spring and continues When the compressible spring exceeds its maximum extension position due to the movement of the sliding door, its direction of action switches, and the other operating claw is pressed into engagement with the curved end of the protruding part of the engagement plate, causing the sliding door to come into close contact with the airtight gasket, etc. I'm starting to do that. Furthermore, when the sliding door is moved in the opening direction, the other operating pawl is pressed against the curved portion of the end of the protruding portion of the engagement plate, and the sliding door is separated from the air tight packing etc. by the reaction force.

[Problems to be solved by the present invention]

In the conventional fastener described above, when the sliding door is opened, the pressing force of the actuating claw is applied to the curved part at the end of the protruding part of the engagement plate, but since this curved part is the end of the engagement plate formed in series, It often flexes and moves when subjected to pressure, and instead of reliably supporting the pressing force, it absorbs and cushions it a little. For this reason, the reaction force applied to the actuating pawl is also reduced by that amount, so that the sliding door cannot be moved away from the airtight gasket sufficiently, making it difficult to open and move the sliding door.

In addition, the engagement plate formed in a series only needs to have its attachment part at one end fixed to the front plate, and the inclined protrusion and the protrusion are arranged parallel to the front plate in front of it, so the sliding door can be closed and moved. When the rotating body is rotated, the inclined protrusion may move slightly due to the collision of one of the actuating claws, and since it cannot fully support this pressing force, the rotation of the rotating body may not start smoothly. Ta.

The present invention solves all of the above problems, and when the sliding door moves to open and close, the rotating body rotates smoothly by reliably supporting the elastic force of the elastic spring and the pressing force applied by the above movement. To provide a door locking device that can open and close a sliding door easily.

[Means for solving problems]

Therefore, in this device, one side of the rotating body is rotatably pivoted on the base plate, a starting roller is attached to one end of the other side, and a first engaging roller and a second engaging roller are attached to the other end. The height of the first engaging roller is set lower than that of the starting roller and the second engaging roller, and a compressible spring tensioned between the base plate and the rotating body keeps the starting roller normally in place. A fastener located on the outside of the board and having a distance between the two engagement rollers in the direction of movement of the sliding door, with each of the rollers facing the front plate and the compressible spring facing the closing side of the sliding door. An engagement plate that is fixed to the upper end surface of the sliding door and has a series of inclined protrusions, protrusions, a receiving plate whose lower half is notched and has a narrow width and returns to the front plate at an angle, and mounting parts at both ends is attached to the protruding part. is attached to the front plate with the base thereof aligned with the closed position of the sliding door, and with the receiving plate oriented in the opening direction of the sliding door so that the protruding part can fit between the two engagement rollers, and as the sliding door closes, Both engaging rollers enter the protruding portion, and the starting roller contacts the receiving plate to rotate the rotating body, and switches the pulling direction of the compressible spring that has exceeded the maximum extension position to move both engaging rollers. The engaging roller is press-fitted to the inclined protrusion, and as the sliding door moves to open, both engaging rollers are pressed and the rotating body is rotated in the opposite direction.

In addition, the fastener is configured such that a long hole is provided in a support plate that is erected on a base plate, and the operating rod is inserted through the long hole, and the tip thereof is pivotally connected to a predetermined position of the rotating body, and the other end of the support plate and the operating rod are connected to each other. A pressure spring may be interposed between the flanged nut and the nut screwed onto the flange.

[Effect]

When the sliding door is closed, the first engagement roller having a low height passes under the receiving plate, and the two engagement rollers enter with the protrusion of the engagement plate sandwiched between them. When the sliding door moves further, the tall starting roller comes into contact with the receiving plate, but the engagement plate with this receiving plate does not move at all because the mounting parts at both ends are fixed to the front plate, and the starting roller does not move at all. Because it fully supports the pressing force,
The rotating body starts rotating smoothly.

Immediately before the rotating body rotates and the sliding door moves to a predetermined closing position, the compressible spring exceeds its maximum extension position and its pulling direction switches, causing the rotating body to rotate in the opposite direction. The second roller engaged with the roller is in a state where it wraps around the inclined protrusion, and
The sliding door is drawn perpendicularly toward the front plate by this rotational force, and is brought into close contact with the airtight gaskets around the opening.

Furthermore, when the sliding door is opened and moved, the second engagement roller that is in pressure contact with the inclined protrusion presses the inclined protrusion, but the engagement plate having the inclined protrusion is
As mentioned above, since the attachment parts at both ends are fixed to the front plate, they do not move at all and completely support the pressing force of the rollers. As a result, the rotating body is smoothly activated and rotated, and as the sliding door continues to move, the pulling direction of the spring is switched, causing the rotating body to rotate in the opposite direction. Therefore, the sliding door is pulled away from the airtight gasket at a substantially right angle, and the subsequent opening movement of the sliding door is performed easily.

〔Example〕

Figures 1 and 2 show an example of a fastener A used in this device, in which 1 is a base plate, 2 is a rotating body, and the rotating body 2 is pivoted on one side of its approximately central portion. It is rotatably attached to the substrate 1 via a shaft 3.
On the other side of the rotating body 2, both ends are slightly protruded, a support shaft 4 is provided upright at one protruding end, and a starting roller 5 is pivotally mounted, and the other protruding part is supported at appropriate intervals. The shafts 6 and 7 are arranged upright and the first shafts are engaged with the shafts respectively.
The roller 8 and the second engagement roller 9 are rotatably connected, but the height of the first engagement roller 8 is set lower than the other starting rollers 5 and the second engagement roller 9. There is. 10 is a support plate fixed on the substrate; 11
is a bolt-shaped spring receiver having a spring insertion hole 12 in its head, which is inserted into the through hole of the support plate 10 and then the nut 1 is inserted.
3 and 14, and the traction force of the spring can be adjusted by turning both nuts.

Further, 15 is a compressible spring, one end of which is rotatably inserted into and engaged with the spring insertion hole 12 of the spring receiver 11, and the other end is located forward of the pivot shaft 3 and It is latched onto a spring receiver 16 fixed to the rotating body 2 at a position near the roller. Therefore, the rotating body 2 is normally in a position where it rotates counterclockwise as shown in FIG. The first engaging roller 8 and the second engaging roller 9 protrude slightly outward from the mating rollers 8 and 9.
A distance a is maintained between them in the direction of movement of the sliding door.

FIG. 3 shows the engagement plate B of this device. This engagement plate includes an inclined protruding portion 1 rising from the mounting portion 18.
9, a protruding part 20 of an appropriate length parallel to the mounting part 18, and a lower half of the continuous part with the protruding part 20 is cut out and has a narrow width and slopes toward the front plate side. A receiving plate 21 which returns to its original position and has an attachment portion 21a to the front plate at its tip is formed integrally with the receiving plate 21. Also,
In the figure, reference numeral 22 indicates a mounting hole of the engagement plate B, and reference numeral 23 indicates a mounting hole of the board.

As shown in FIGS. 4 and 5, the above-mentioned fastener A has the retractable spring 15 pulled in the closing direction of the sliding door 24, and the rollers 5, 8, and 9 attached to the front plate 25 of the freezer or the like. It is attached to the upper end surface of the sliding door 24 by fixing it with a bolt or the like almost at the center of the upper end surface. Furthermore, the engagement plate B is configured such that the receiving plate 21 is in the opening direction of the sliding door 24, the base 20a of the protruding part is aligned with the closing position of the sliding door, and the protruding part 20 can enter between the two engaging rollers 8 and 9. It is placed in the same position and fixed to the front plate 25 of a freezer or the like using bolts or the like.

FIG. 6 is an explanatory diagram of the operation when closing the sliding door. When the sliding door 24 is moved in the direction of arrow R in the figure and closed, the first engagement roller 8 with a low height is moved into the notch of the receiving plate 21. The engaging rollers 8 and 9 enter the space a between them, sandwiching the protrusion 20. When the sliding door 24 further moves, the tall starting roller 5 comes into contact with the receiving plate 21 and the inclined surface rolls while receiving resistance. , 21a are fixedly attached to the front plate 25, and therefore completely support the pressing force of the starting roller 5 without moving at all. Therefore, rotation of the rotating body 2 is smoothly started, and the rotating body 2 rotates clockwise about the pivot shaft 3 as a fulcrum against the elasticity of the compressible spring 15.

Just before moving to the predetermined closing position,
When the compressible spring 15 exceeds the maximum extension position, its pulling direction is switched, and the rotating body 2 is rotated clockwise in the opposite direction. As a result, as shown in FIG.
The roller 8 goes around the inside of the base 20a of the protrusion 20, and the second engagement roller 9 goes around the outside of the inclined protrusion 19 and presses against it, respectively, and both the engagement rollers 8 and 9 sandwich the inclined protrusion 19. This turning force causes the sliding door 24 to be drawn perpendicularly toward the front plate 25 by a distance b, and is brought into close contact with the airtight gasket 26 around the opening.

Furthermore, when the sliding door 24 is opened and moved to the right in FIG. Engagement plate B with protrusion
As mentioned above, the mounting portions 18 and 21a at both ends
Since it is fixedly attached to the front plate 25, it completely supports the pressing force of the roller 9 without moving at all. As a result, the rotating body 2 is smoothly activated and rotates counterclockwise against the elasticity of the spring 15, and when the second engagement roller 9 comes to the base 20a due to the subsequent movement of the sliding door 24, the spring 15 is activated. The pulling direction is switched and the rotating body 2 is rotated in the opposite direction. For this reason, the sliding door 24 has airtight packing 2.
6, and the subsequent opening movement of the sliding door 24 is performed lightly.

FIG. 8 shows an embodiment of the fastener A, in which a horizontal elongated hole 27 is provided in the upright support plate 10, an operating rod 28 is inserted into this, and the tip thereof is connected to the above-mentioned spring of the rotating body 2. A pressing spring 29 is interposed in the operating rod 28 that is rotatably engaged with a through hole provided at a position corresponding to the receiving portion 16 and protrudes from the support plate 10, and a threaded portion is provided at the other end of the operating rod 28. is provided, and the flanged nut 28a is screwed thereto, so that the elastic force of the pressing spring 29 can be adjusted. This embodiment has the advantage that the means for pulling the rotating body 2 can be simplified by the operating rod 28, and the spring strength can be adjusted from the outside of the support plate 10.

In this embodiment, for convenience of explanation, only a single-opening sliding door has been described, but this device can also be attached to a double-opening sliding door in a symmetrical manner.

〔effect〕

As described above, according to the present invention, a compressible spring is applied to the rotating body having the starting roller and the first and second engaging rollers, so that the starting roller is normally positioned outward, and both of the engaging rollers are A fastener with a space between them in the direction of movement of the sliding door is fixed to the upper end surface of the sliding door, and the inclined protrusion, the protrusion, and the low-height engaging first roller can pass through the front plate of the doorway. An engagement plate is installed, which has a narrow width that tilts back toward the front plate, and an engagement plate that is formed in a series with mounting parts on both ends, so that the receiving plate that the starting roller collides with when the sliding door closes is integrated with this plate. The mounting parts at both ends of the engagement plate are fixed to the front plate, so they do not move at all, and completely support the pressing force of the starting roller, allowing the rotation of the rotating body to start smoothly. At this time, the inclined protrusion pressed by the second engagement roller does not move at all because the attachment parts at both ends of the engagement plate that are integral with it are fixed to the front plate as described above.
The rotating body can be started smoothly by fully supporting the pressing force of the roller, and has the effect of allowing the sliding door to be opened and closed easily.

[Brief explanation of drawings]

The drawing shows one embodiment of the device of the present invention,
Fig. 1 is a plan view of the fastener, Fig. 2 is its front view, Fig. 3 is a slope view of the engagement plate, Fig. 4 is a partially vertical side view of the used state, and Fig. 5 is a front view of the same state. , FIG. 6 and FIG. 7 are explanatory diagrams of the engagement action, and FIG. 8 is a plan view showing another embodiment of the fastener. A... Fastener, B... Engagement plate, 1... Board,
2... Rotating body, 3... Pivoting shaft, 5... Starting roller, 8... First engaging roller, 9... Second engaging roller, 10... Support plate, 15... Contractible spring, 19...
... Inclined protrusion, 20 ... Protrusion, 20a ... Base, 21 ... Reception plate, 24 ... Sliding door, 25 ... Front plate, 27 ... Long hole, 28 ... Operating rod, 29 ... Pressing spring .

Claims (1)

[Scope of Claims] 1. In a sliding door that is suspended from the upper part of the front plate of the doorway and moves linearly back and forth to open and close the doorway, one side of the rotating body is rotatably pivoted on a base plate, and the other side is pivoted on the base plate. A starting roller is provided at one end, and a first engaging roller and a second engaging roller are erected at the other end.
The height of the roller is set lower than the starting roller and the second engagement roller, and a compressible spring stretched between the substrate and the rotating body normally positions the starting roller outside the substrate. A fastener with a gap maintained between both engaging rollers in the direction of movement of the sliding door is fixed to the upper end surface of the sliding door with each of the rollers facing the front plate side and the compressible spring facing the closing side of the sliding door, and tilted. The protruding part, the protruding part, the receiving plate whose lower half is cut out and narrow and tilted back to the front plate side, and the engagement plate formed in series with the mounting parts at both ends, and the base of the protruding part is aligned with the closing position of the sliding door. and attach the receiving plate to the front plate in the opening direction of the sliding door in a position where the protruding part can fit between the two engaging rollers, and when the sliding door closes, both engaging rollers move the protruding part. The starting roller comes into contact with the receiving plate and rotates the rotating body, switches the pulling direction of the compressible spring that has exceeded the maximum extension position, and presses and engages both engaging rollers with the inclined protrusion. A door locking device for a sliding door, characterized in that when the sliding door moves to open, both engaging rollers are pressed and a rotating body is rotated in the opposite direction. 2. The fastener is provided with a long hole in a support plate erected on the base plate, through which the operating rod is inserted, the tip of which is pivotally attached to a predetermined position of the rotating body, and the other end of the support plate and the operating rod are connected to each other. 2. A door locking device for a sliding door according to claim 1, wherein a pressure spring is interposed between the bolt and the flanged nut.