JP2591454Y2 - Automatic door closing mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door closing mechanism used for a showcase or the like.

[0002]

2. Description of the Related Art In an automatic door closing mechanism used in a showcase or the like, a door in an open state can be reliably and smoothly automatically closed, and a door closing speed can be controlled reliably. The impact between the door and the frame when the door is closed is significantly reduced compared to conventional products.
The use of a piston-cylinder type spring for the automatic closing mechanism has been previously proposed for the purpose of significantly improving the durability of the apparatus (Japanese Patent Application No. Hei 3-307065).

However, in order to mount a piston-cylinder type spring on a door, for example, in the case of a showcase, the piston is pushed into the cylinder against the repulsive force of the spring of 20 kgf or more. ,
The hinge fittings at both ends of the spring must be connected to the pins provided on the door and the pins installed on the door frame frame that supports the door, respectively, and the piston-cylinder type spring itself has a generally cylindrical outer shape. Since a separate gripping member was not provided, it was almost impossible to perform the mounting work manually.

Further, when the piston-cylinder type spring is of a type in which the rod portion of the piston swings with respect to the cylinder portion, not only does the above operation become more difficult, but also the piston- The cylinder spring itself could be damaged or broken. These points are the same, though to varying degrees, in the case where a helical spring or the like is used as the spring body.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art at once.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a door is pivotally supported on a door frame via a hinge so as to be openable and closable, and is provided on the door frame. A spring body is provided between the first pin and a second pin provided on the door, and the door is turned around a hinge and automatically closed by a repulsive force of the spring body acting between these pins. An automatic closing mechanism for a door, wherein a first pin and a spring body are connected by a connecting member, and the connecting member turns around the first pin at a first connecting portion with the first pin. Movable mechanism, and wherein said coupling member is rotatable at its other end about a second coupling between the spring body and the coupling member. Things.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an essential part showing an example of the automatic door closing mechanism of the present invention. The door frame 2 has a first pin 6, and the door 1 has a second pin 7. An engaging portion 13 provided at one end of the spring body 3 is engaged with the second pin 7, and the other end of the spring body 3 is connected to the first pin 6 via the connecting member 5.
Linked to The connecting member 5 is rotatably attached to the first pin 6 at the first connecting portion 15 and is attached to the spring body 3 at the second connecting portion 25 at the other end.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1. FIG. 2A shows a closed state of the door after the spring body is mounted.
(B) shows the state before the spring body is mounted. A substantially U-shaped engaging portion 13 of the spring body 3 is engaged with a second pin 7 provided on the door, and the other end is rotatably attached to a second connecting portion 25 of the connecting member 5. ing. Connecting member 5
Is attached to a first pin 6 provided on the door frame 2 at the first connecting portion 15 so as to be rotatable around the first pin 6.

The piston of the spring body 3 is shorter than its free length when mounted on the door 1 and the door frame 2, and has a repulsive force in the extending direction, that is, a protruding force. Since the piston is further contracted when the door 1 is opened, this force is transmitted through the door frame 2 and the pins 6 and 7 attached to the door 1 to the center of the hinge 8 (the hinge center of the door).
To generate a moment for the automatic closing of the door 1.

A spring body, in particular, a piston-cylinder type spring body has air or other working medium therein.
After being filled with a required amount according to a predetermined design output, it is mounted on a showcase, and its length at the time of mounting is almost free. The same is true for the case where the helical spring is used as a working medium and has a free length.

On the other hand, the repulsive force of the piston is designed with a large force of, for example, 20 to 30 kgf in order to securely close the door 1, and the second pin 7 attached to the door 1 and the door frame Since the interval between the second pin 6 attached to the body 2 is shorter than the sum of the length of the free length of the spring body 3 and the length of the connecting member 5, in order to attach the spring body 3, Unless it resists such a large force and is once shortened by about 10 to 20 mm from its free length, it cannot be attached to the showcase door 7.

Therefore, the operation of attaching the spring body 3 according to the configuration of the present invention is performed by the spring body 3 having a free length.
Is attached to the connecting member 5, and the other end of the connecting member 5 is attached to the first pin 6 provided on the door frame 2. At this time, the connecting member 5 and the first pin 6 are rotatable around the pin 6, and the spring body 3 and the connecting member 5
Is rotatable at the connecting portion 25.

Thereafter, the substantially U provided on the spring body 3
Positioning the U-shaped engagement portion 13 near the second pin 7,
The connecting portion 25 is rotated in the direction of the arrow so that the engaging portion 35 of the connecting member 5 is pushed in, and the engaging portion 1 of the spring body 3 is rotated.
3 is engaged with the second pin 7.

At this time, the rotation of each member is
Both ends of the connecting member 5, that is, the first and second connecting portions 15,
25, which can be rotated around this, so that, for example, the tip of a general-purpose screwdriver can be connected to the engaging portion 35 of the connecting member 5.
The spring body 3 can be easily attached to the door part by inserting and pushing in.

[0016] Even when the door is closed, the connecting portions 15, 16 are protruded by the spring force of the spring body 3 shorter than the free length.
Easily rotates, and the connecting portion 2
5 goes around, and the engaging portion 13 of the spring body 3
It is preferable that the door frame 2 be provided with a pressing member 9 in order to prevent the spring body 3 from dropping out of the door frame 2.

[0017]

[Effect of the Invention] According to the spring body of the present invention, mounting work for attaching the spring body to a door such as a showcase is greatly simplified, smooth and easy, and the working time can be greatly reduced. Further, it is possible to obtain an automatic door closing mechanism that can reduce the number of workers.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part showing an example of a door automatic closing mechanism of the present invention.

FIG. 2 is a schematic sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 1: Door 2: Door frame 3: Spring body 5: Connection member 6: First pin 7: Second pin 13: Engagement part 15, 25: Connection part

Claims (1)

(57) [Scope of request for utility model registration] A door is pivotally supported on a door frame via a hinge so as to be openable and closable, and a spring body is provided between a first pin provided on the door frame and a second pin provided on the door. An automatic closing mechanism for the door, wherein the first pin and the spring body are connected to each other by a resilient force of the spring body acting between the pins, whereby the door is rotated about the hinge and automatically closed. And the connecting member is rotatable about the first pin at a first connecting portion with the first pin, and the connecting member is connected to the spring body at the other end thereof. An automatic door closing mechanism rotatable about a second connection with the member.