JPH0222462Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that locks the door under tension.

In conventional doors, in order to improve the earthquake resistance of the switchboard, the contact area between the switchboard body and the door was fixed at multiple points using bolts or locking devices. Additionally, to increase the strength of the door itself, the thickness was increased and beams were added.

In such conventional devices, since force is applied to the fixed portion of the door, it is necessary to increase the number of fixing bolts, etc., and this has the disadvantage of poor workability when opening and closing the door.

This invention aims to eliminate the above-mentioned drawbacks by applying tension to the door when it is locked.

FIG. 1 shows an embodiment of this invention. In the figure, a door 3 opens and closes using a hinge 2 attached to a switchboard main body 1 as a fulcrum. An arm 4 is attached to this door 3 and can move around a fulcrum a. The fixture 5 is fixed to the main body 1 and guides and locks the roller 6 attached to the arm 4. A scale-shaped metal fitting 7 is attached to the door 3 and can move around a fulcrum c,
It is connected to the metal fitting 4 by a connecting rod 8.
The stopper 9 is fixed to the door 3, and after the metal fitting 7 rotates and generates the maximum force between the fixed metal fitting 5 and the roller 6, it rotates further and when this force decreases a little, the metal fitting 7 rotates. It is installed to stop rotation.

Next, the operation of this invention will be explained. When the metal fitting 7 is rotated clockwise in FIG. 2, the roller 6 and the fixing metal fitting 5 come into contact with each other, as shown in FIG. 1. When the metal fitting 7 is further rotated clockwise, a pressing force is exerted between the roller 6 and the fixed metal fitting 5. At this time, the force acting on the fulcrum a is the resultant force of the reaction force F1 that the roller 6 receives from the inclined surface of the fixture ₅ and the biasing force F2 biased by the connecting rod ₈ . F has the size and direction of _T. Here F ₁ , F ₂
It is determined by the principle of a lever, and is the inverse ratio of the distance _l1 between the fulcrum a on the arm 4 and the rotation axis of the roller 6, and the distance _l2 between the connection point between the arm 4 and the connecting rod 8 and the fulcrum a. determined by As is clear from FIG. 3, the locking force F _T generated at this time acts to tension the door 3 fixed by the hinge 2 in the vertical and lateral directions. Furthermore, the force applied to the fixing metal fitting 5 acts in the direction of each hinge 2, and each hinge 2 is moved from the fixed point of each hinge 2 on the main body 1 side to the fulcrum a as a reaction to the force applied to the door.
Since a force is acting toward the main body 1, a force is acting between each hinge 2 and the fulcrum a in the direction toward each other on the main body 1 side.

After exerting the maximum force acting between the roller 6 and the fixture 5, it contacts the stopper 9 and stops rotating, so in order to release this lock, it must be at least the difference between the maximum force and the force when it is locked. This lock will not open unless you apply force.

As explained above, according to this invention, tension is applied when the door closes and locks, so the door itself becomes a reinforcing member for the switchboard main body, improving the seismic strength of the switchboard main body, as well as opening and closing the door. This has the effect of making it easy to perform.

[Brief explanation of the drawing]

Figures 1, 2, and 3 show an embodiment of this invention; Figure 1 is a partially cutaway front view with the door locked, Figure 2 is a partially cutaway front view with the door unlocked, and Figure 3 is a partially cutaway front view with the door unlocked. is the fulcrum a when the door is locked
It is a figure showing the action state of the force. In the figure, 1 is the main body, 2 is the hinge, 3 is the door,
4 is an arm, 7 is a metal fitting, 5 is a fixing metal fitting, 6 is a roller, 8 is a connecting rod, and 9 is a stopper.
Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A hinge provided at least near the upper and lower ends of one side of the main body opening, and an inclined surface inclined in opposite directions formed on one side, provided at least near the upper and lower ends of the other side of the opening. a door that is attached to the hinge on one side and rotates about the hinge to open and close the opening, and a door that is attached near the other side of the door and rotates about the fulcrum C. A scale-shaped metal fitting and a roller rotatably provided at the upper and lower ends of the other side of the door, each having a roller that comes into contact with and separates from the inclined surface of the fixture at one end, and a driven arm at the other end. and a connecting rod that connects one end of each of the scale-shaped metal fittings to the driven arm of the arm, and when the door is closed, the balance-shaped metal fitting is rotated to connect the connecting rod. By driving the arms through the and pressing the rollers against the fixing fittings, the fulcrums a of the respective arms provided at the upper and lower ends of the door move away from each other and away from the hinge.
A door locking device characterized in that the door is locked by generating a biasing force on the door.