JPH0528881Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for hooking a door provided in a switchboard to a panel frame.

[Conventional technology]

Various types of locking devices have been used for the past to secure the door installed on the front of the switchboard to the panel frame, but recently, coins, etc. A locking device is used that locks and unlocks by rotating the lock through 90 degrees.

For example, a product called Sign Fastener manufactured by Sign Kogyo Co., Ltd., as shown in Fig. 8, consists of a latching spring 2 and a fastener main body 5. The main body 5 is passed through and held by the door 32.

FIG. 9 shows a conventional example in which this sign fastener is used for the door of a switchboard. In the same figure, a fastener body 5 is inserted into the door 4 at a position opposite to the fastener insertion hole 1b on the panel frame 1 side, a groove 5c is formed at a position of about 5 mm from the door surface of the fastener body 5, and an E-shaped stopper is formed. A ring 6 is fitted and attached so as to be swingable. A plate spring 33 is inserted between the inner surface of the door of the fastener body 5 and the E-shaped retaining ring 6, leaving a slight gap, to suppress the protrusion of the head of the fastener body 5 from the door surface, and to prevent the head of the fastener body 5 from protruding from the door surface. When closing the door, the tip of the fastener body 5 is inserted into the fastener insertion hole 1b of the panel frame 1.
It is designed to fit.

The fastener body 5 has a spiral groove 5b at the tip.
is formed, and when a screwdriver or coin is inserted into the groove 5a of the head of the fastener body 5 and rotated 90 degrees, the helical groove 5b is inserted into the locking spring 2.
It is designed to fit and hold. This results in
The door 4 can be hung on the panel frame 1. The door can be unlocked by inserting a screwdriver or a coin into the groove 5a of the head of the fastener body 5 and rotating it 90 degrees in the opposite direction.

[Problem that the invention attempts to solve]

However, the latching device shown in FIG.
There are the following problems.

That is, when attempting to close the door 4, when the door is pressed against the panel frame side by hand, the tip of the fastener body 5 strongly hits the locking spring 2, and the pressing force or impact force is applied to the plate spring 33. Therefore, there is a problem in that the plate spring 33 is compressed beyond its elastic limit, causing deformation or breakage. Additionally, switchboards typically include a mechanical interlock device between the door and the panel body, which creates other problems. That is, the interlock device is constructed as shown in FIGS. 4 to 6, for example. In these figures, reference numeral 11 denotes an operating handle, which is attached to the front surface of a switch 13 such as a circuit breaker by means of a handle support frame 12. 4 is a door attached to the front of the board frame 1 so as to be openable and closable. A release lever 15 is fixed to the handle shaft 14 of the operating handle 11, and a pin 17 for moving the slide plate 16 up and down is attached to the release lever 15. The slide plate 16 engages with the handle 13a of the switch 13, and opens and closes the switch 13 by the vertical movement.

As shown in Figs. 5 and 6, the handle support frame 12 has a release lever 15 and a handle shaft 14.
The release lever 15 is attached to the lock lever 10, and the tip of the release lever 15 engages with an engagement pin 19 provided at the base end of the lock lever 10. The lock lever 10 is rotatably supported by a shaft 18 on the support frame 12, and its tip is normally biased by a spring 20 so as to engage with a door locking hook 9 provided on the door 4, as shown in Fig. 4. When the release lever 15 is rotated so that the switch 13 opens, the tip of the release lever 15 engages with the lock lever 10.
0, driving the pin 19 at the base end of the lock lever 10.
The engagement between the tip of the spring and the door locking hook 9 is
It is designed to be released against the biasing force of 0.

As shown in FIG. 7, a tapered portion 9a and an engaging portion 9b are formed at the tip of the door locking hook 9, and when the door is closed as shown in FIG. The door is pushed away against the pressure, and through the process shown in b, the door reaches the closed position shown in c. In this state, the front end of the lock lever 10 is engaged with the engaging portion 9b, so the door 4 cannot be opened. When the operating handle 11 is operated to the open side and the lock lever 10 is rotated, the lock lever 10 is rotated as shown in FIG.
As shown in , the engagement of the door locking hook 9 with the locking portion 9b is released, and the door 4 can be opened. If such a mechanical interlock device is provided, when the fastener body 5 is turned to open the door with the switch 13 of the circuit breaker etc. If you just leave, the door will not open. At this time,
Since the separation distance between the locking spring 2 and the fastener body 5 is approximately 4 mm, the door locking device side will rise by approximately 4 mm without the door opening, and the spring of the locking spring 2 will be released through the fastener body 5. It will be pushed by an external force. This separation distance is absorbed by the contraction margin of the space between the E-shaped retaining ring 6 of the fastener body and the inner surface of the door 4. However, if the contraction margin is insufficient, the plate spring 33 reaches its elastic limit in that space. If the door is pressed beyond the
This may cause problems such as bending or deformation.

The present invention was devised in view of such conventional problems, and aims to provide a structure that does not cause strain or damage to the door or the locking device.

[Means for solving problems]

To achieve this purpose, the switchboard door latching device of the present invention uses an S-shaped latching spring attached to the back of the switchboard frame, and a latching spring attached to the door side of the switchboard that rotates approximately 90 degrees. In a door locking device comprising a rod-shaped fastener body in which a spiral horizontal groove formed at a tip fits into a longitudinal center portion of the locking spring through an insertion hole provided in the board frame, the fastener body includes: The present invention is characterized in that a buffer spring having a compression margin larger than the fitting stroke of the fastener body is attached to the door via the inside of the door.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings. FIG. 1 is a cross-sectional plan view showing the structure of the door locking device of the present invention. The fastener main body 5 is inserted into the fastener mounting hole 4a formed in the door 4 at a position opposite to the fastener insertion hole 1b on the board frame 1 side, and the fastener main body 5 is detached from the door surface of the fastener main body 5 and the buffer is removed. A place that is sufficiently larger than the sum of the contact height of spring 7, for example
A groove is formed at a position of about 16 mm, and an E-shaped retaining ring 6 is fitted into the groove, which is swingably attached. A coil spring 7 is installed between the door inner surface of the fastener body 5 and the E-shaped retaining ring 6 to restrict the inclination of the fastener body 5, so that when the door is closed, the tip of the fastener body 5 is inserted into the fastener insertion hole of the panel frame 1. 1b so that it almost fits. An S-shaped latching spring 2 as shown in FIG. 2 is fixed to the mounting portion 1a of the board frame 1 with rivets 3.
It can be engaged with the spiral groove 5b at the tip of the fastener body 5. When a screwdriver or a coin is inserted into the groove 5a of the head of the fastener body 5 and rotated 90 degrees, the spiral groove 5b is fitted into the locking spring 2 and held. Thereby, the door 4 can be latched to the panel frame 1. Insert a screwdriver or coin into the groove 5a on the head of the fastener body 5 and rotate it 90 degrees in the opposite direction to form the spiral groove 5b.
The locking spring 2 is disengaged from the locking spring 2, and the door can be unlocked. Note that 8 indicates a hinge between the door 4 and the panel frame 1.

Figure 1 shows the door 4 closed and latched, but the fastener body 5 can be attached with the door 4 as it is.
FIG. 3 shows a state in which the door 4 is rotated 90 degrees and disengaged from the spring 2, or the door 4 is pressed against the panel frame 1 from the open state. In this state, the tip of the fastener body 5 is held by the spring 2. The fastener main body 5 is attached to the door 4 via a coil spring 7, and the fastener main body 5 is movable in the longitudinal direction. Therefore, by the head of the fastener main body 5 protruding from the door 4,
Load on the spring 2 can be avoided. That is, the pressure and impact exerted by the spring 2 on the fastener body 5 or the door 4 can be alleviated.
In this case, the magnitude of the load due to spring 2 is
The force is the compression length l of the coil spring 7 multiplied by the spring constant. From the state shown in Figure 3, the operating handle 11
When turned off, the mechanical interlock with the door 4 is released and the door 4 can be opened.

In this way, since the fastener main body 5 is movably attached via the coil spring 7,
When the fastener main body 5 is turned in the direction to open the door, the coil spring 7 is compressed to absorb the movement of the fastener main body 5, thereby preventing damage to the spring 7 and preventing the door from being damaged. deformation can be prevented.

[Effect of idea]

As explained above, in the present invention, the fastener body is movably attached to the door via a buffer spring. Therefore, even if the fastener body is turned in the unlatching direction with the external operation handle turned on, the movement of the fastener body is absorbed by the buffer spring, and the door remains reliably closed. It is possible to prevent the force acting on the door to open it, thereby improving the reliability of the closed state of the door and the safety of internal equipment. In addition, even if the tip of the fastener body hits the latch spring when the door is closed, the load is buffered by the buffer spring, so no unreasonable force is applied to the latch spring. In either state, deformation or damage to the fastener, locking spring, and door can be prevented.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional plan view of an embodiment of the present invention, Fig. 2 is a rear view showing the attachment part of the latching spring, and Fig. 3 is a cross-sectional view with the door closed and the fastener body not closed. Fig. 4 is a side view showing the relationship between the door, the door locking hook, and the lock lever, and Fig. 5 is a front view of the interlock device attached to the door.
Figure 6 is a cross-sectional plan view showing how it is attached to the door;
FIG. 7 is an explanatory diagram of the engagement relationship between the lock lever and the door locking hook, FIG. 8 is an exploded perspective view showing an example of an existing fastener device, and FIG. 9 is a sectional view of a conventional door locking device. 1...Panel frame, 1a...Mounting part, 1b...
Insertion hole, 2...spring (latching spring),
3... Rivet, 4... Door, 5... Fastener body, 5a... Straight groove, 5b... Spiral groove, 6...
...E-type retaining ring, 7...Coil spring (buffer spring), 8...Hinge.

Claims (1)

[Scope of utility model registration request] The panel frame 1 includes an S-shaped hanging spring 2 attached to the back side of the panel frame 1 of the switchboard, and a spiral horizontal groove 5b formed at the tip by being attached to the door 4 side of the switchboard and rotated approximately 90 degrees.
In a door locking device comprising a rod-shaped fastener body 5 that fits into the longitudinal center portion of the locking spring 2 through an insertion hole 1b provided in A door latching device for a power distribution board, characterized in that a buffer spring 7 having a larger compression margin is attached to the door 4 through the inside of the door 4.