JPH0621275Y2 - Detachment prevention mechanism for units that are detachably attached to the rack - Google Patents

Description

[Detailed Description of the Invention] [Outline] The present invention relates to a seismic countermeasure for a communication device or the like configured by mounting a large number of detachable units on a rack, and particularly relates to a mechanism for preventing the units from falling off the rack. In order to provide a mechanism that can easily and reliably obtain a unit removal prevention effect, a removal prevention mechanism for each unit detachably attached to a rack that constitutes a device such as a communication exchange, An axially movable axially movable rod having rack-shaped teeth, and a vertically movable axially movable lock pin that cooperates with the axially movable rod via a transmission mechanism. The tip of the pin is configured to be retractable into and out of the locking groove provided in the rack when the fall prevention mechanism is installed at a predetermined position of the rack. Is converted into an ascending / descending stroke of the lock pin, whereby the engagement between the tip of the lock pin and the engaging groove and the release thereof are performed.

[Industrial application field]

The present invention relates to a seismic countermeasure for a communication device or the like configured by mounting a large number of removable units on a rack, and more particularly to a mechanism for preventing the units from falling off the rack.

[Conventional technology and its problems]

In a device configured by detachably mounting various units on a rack, for example, a communication exchange, etc., there is a problem that a system down occurs due to an accident in which these units fall off when an earthquake occurs.

As a measure for preventing this falling, a method of fixing the unit to the rack by screwing can be considered. This method is inexpensive and surely secures the fixing, but it takes much time to attach or detach the unit when repairing or exchanging the unit, and screws are often lost, which is not preferable.

In addition, there is also a system in which a unit is fixed at a predetermined position by a holding mechanism such as Nylatch (trademark) and then a lock pin is inserted to prevent it from coming off, and this is restrained by a spring to prevent it from coming off. According to this, the unit can be easily attached and detached, but it cannot be said to be perfect because there is a risk that the lock will be released when a large impact is applied.

The present invention solves the above problems in the prior art,
It is an object of the present invention to provide a mechanism that is easy to operate and that has a sure effect of preventing a unit from falling off.

[Means for Solving the Problems]

The purpose of this is to prevent detachment of each unit that is detachably attached to a rack that constitutes a device such as a communication exchange. It has rack-shaped teeth in a part thereof and is movable in an axial direction extending in a horizontal direction. An operating rod and an axially movable lock pin that cooperates with the operating rod via a transmission mechanism and extends in the vertical direction are provided. At the tip of the lock pin, the fall prevention mechanism is installed at a predetermined position on the rack. In this case, it is configured so that it can be retracted and retracted in the locking groove provided on the rack, and the stroke of pulling in and pushing in of the operating rod is converted into the stroke of ascending and descending of the lock pin, thereby locking with the tip of the lock pin. This is achieved by a fall prevention mechanism characterized by engaging with and releasing a groove.

[Action]

To install the unit, pull out the operation rod of the drop-out prevention mechanism, push the frame body to the predetermined position of the rack with the lock pin raised, and position it, and align the axis of the lock pin with the locking groove of the rack. Let Then, when the operating rod is pushed in, the lock pin descends and its lower end enters the locking groove, locking the unit with respect to the rack, so that the unit does not fall off even if vibration is applied.

On the contrary, when the unit is removed, the operation rod may be pulled out to raise the lock pin to be released from the locking groove, and then the frame may be pulled out from the rack.

Hereinafter, the present invention will be described in more detail with reference to the preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 is a side view of a fall prevention mechanism according to an embodiment in which the present invention is applied to a forced cooling fan unit attached to a telecommunication exchange.

The exchange has a structure in which a fan unit is interposed between layers of electronic circuit units that are mounted in parallel on a rack in parallel with each other to forcibly cool the heat generated from the electronic circuit units.

This fan requires regular maintenance and replacement, so the frame 1 that houses the fan (not shown)
Is detachably attached by engaging a projection 3 provided on the rear portion thereof with a known locking tool such as Nylatch (trademark) provided on the wall surface of the rack 2.

The fall-out prevention mechanism of the present invention is installed on the front surface of the frame 1 of the fan, and has a horizontally extending operation rod 4, a vertically extending lock pin 5 provided behind the operation rod 4, and a transmission mechanism that cooperates between them. 6, the lock pin 5 and the transmission mechanism 6 are housed in a housing 8.

At a predetermined position of the rack 2 to which the frame body 1 is attached, a locking groove 7 that coincides with the axis of the lock pin 5 is horizontally provided in a direction orthogonal to the axial direction of the operation rod 4, and the lock pin 5 descends. At that time, the lower end thereof is designed to enter the groove.

The operation rod 4 is composed of a knob 4a protruding to the front surface of the rack 2 and a main body 4b following the knob 4a, which extends in the horizontal direction. A part of the main body 4b enters the housing 8 as a rack 4c. Then, by manually operating the knob 4a, it is possible to pull out and push in along a certain limit of the axis.

The lock pin 5 is cut along its axis from its upper end to the central portion to form a vertical slit 5a, and a shaft 9b described later is loosely fitted in the slit 5a in the horizontal direction.

As shown in FIGS. 2 and 3, the transmission mechanism 6 includes three parallel shafts 9a and 9b that extend horizontally across the walls of the housing 8 at right angles to the operation rod 4. ，
It is carried by 9c.

The rack 4c of the operating rod 4 meshes with the first gear 10 carried on the shaft 9a, and the first gear 10 meshes with the second gear 11 on the shaft 9b. As described above, the shaft 9b engages with the slit 5a formed in the lock pin 5, and serves as a guide when the lock pin 5 moves up and down.

A rack 5b meshing with the lock pin 5 is formed on the side surface of the lock pin 5 facing the first gear 10, and a material having a high friction coefficient such as rubber is attached to the opposite side surface 5c. There is.

The shaft 9c carries a rubber roller 12 which is in contact with the side surface 5c of the lock pin 5 with a predetermined pressure.

When the operating rod 4 is fully pushed into the rack 2 shown by the solid line in FIG. 1, the lower end of the lock pin 5 enters into the locking groove 7 to lock the frame body 1 in that position. is doing. When the operating rod 4 is pulled out to the left from this state to the position shown by the chain line in FIG. 1, this operation causes the rack 4c to rotate the first gear 10 counterclockwise in FIG. Then, the lock pin 5 ascends by the action of the rack 5 b meshing with the first gear 10 and escapes from the locking hole 7. This rise is due to the shaft 9b and the slit 5a.
And the pressure contact from the rubber roller 12 smoothly.

In this state, if the frame body 1 is pulled out by grasping the knob 4a of the operation rod 4, it can be removed from the rack. When installing the fan unit, the reverse operation may be performed.

This is the basic principle of attachment / detachment by the mechanism of the present invention.

In the above description, when the pushing stroke of the operation rod 4 is too large when locking to the frame, the first gear 10 excessively rotates and the rack 5b of the lock pin 5 meshing with the first gear 10 rotates excessively. May drop too much, and the upper end of the slit 5a may come off the shaft 9b. In order to prevent this, the present invention is devised so that when the lock pin 5 descends by a certain limit, the meshing with the first gear 10 is disengaged.

Explaining this, as shown in FIG. 4, the shaft 9b has a screw 14 cut in a part thereof, and the screw 14 is
As shown in the drawing, a pair of flanged sleeves 13 each having an internal thread 15 cut on the inner peripheral surface are screwed together. The outer shape of the sleeve 13 has side surfaces 13b parallel to each other, and the side surfaces 13b are loosely inserted from both sides into the slit 5a of the lock pin 5 so that the side surface 13b is parallel to the side wall of the slit 5a. It is mounted so as to hold it. With this configuration, the shaft 9b
When is rotated, both sleeves 13 move on the shaft 9b in either the left or right direction according to the rotating direction. As a result, the lock pin 5 can be laterally moved together with the lock pin 5 while being sandwiched between the sleeves 13. Therefore, when the operation rod 4 is pushed in, the lock pin 5 moves to the right side in FIG. 2 along the shaft 9b as it descends, and is disengaged from the engagement range with the first gear 10. Therefore, further descent is prevented. The upper and lower positions thereof are maintained by frictional contact with the rubber roller 12, and the magnitude of the frictional force is set so that the current state is maintained unless a considerable force is applied to the operating rod. On the contrary, when the operating rod 4 is pulled out, the lock pin 5 moves to the left on the shaft 9b, and the rack 5b moves to the first gear 1.
It enters the engagement range with 0 and is given a rising motion. As a result, the frame 1 is released from the locking groove 7 as described above, and the lock of the frame 1 is released.

In addition to the above-described example in which both the shaft 9b and the sleeve 13 are threaded, a stroke groove 16 is formed in the shaft 9b as a lateral movement mechanism of the lock pin 5 as shown in FIGS. 6 and 7. On the other hand, it is also possible to use the one in which the sleeve 17 is provided with the ball 17 engaging with the sleeve 13.

[Effect of device]

As described above in detail, according to the present invention, the frame of the unit can be locked and released from the rack simply and reliably by pushing and pulling the operation rod, so that the earthquake resistance is improved. At the same time, the time and effort required for attachment and detachment during maintenance can be omitted.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a unit disengagement prevention mechanism of the present invention, FIGS. 2 and 3 are plan views and side views showing the same mechanism of motion transmission, and FIG. 4 is a lock pin. FIG. 5 is a side view showing the shape of a shaft for lateral movement, FIG. 5 is a perspective view showing the shape of a sleeve, and FIGS. 6 and 7 are fourth views of another example for lateral movement of the lock pin. It is a figure corresponding to a figure and FIG. DESCRIPTION OF SYMBOLS 1 ... Frame body, 2 ... Rack, 3 ... Protrusion, 4 ... Operation rod, 4a ... Knob, 4b ... Main body, 4c ... Rack, 5 ... Lock pin, 5a ... Slit, 5b ... Rack, 6 ... Transmission mechanism, 7 ... Locking groove, 8 ... Housing, 9a, 9b, 9c ... Shaft, 10 ... First gear, 11 ... Second gear, 12 ... Rubber roller, 13 ... Sleeve, 14, 15 ... Thread.

Claims (1)

[Scope of utility model registration request] 1. A rack (2) constituting a device such as a communication exchange.
A detachment prevention mechanism for each unit that is detachably attached to the unit. The operation rod (4) has a rack-shaped tooth (4c) partially and extends in the horizontal direction, and the transmission mechanism (6). A lock pin (5) that is movable in the axial direction and that extends in the vertical direction and that is linked to the operating rod (4) via a lock pin (5).
When the fall prevention mechanism is installed at a predetermined position on the rack, the fall prevention mechanism is configured to be retractable into and out of the locking groove (7) provided on the rack so that the operation rod (4) can be pulled out and pushed in by the lock pin. A fall prevention mechanism, characterized in that the stroke (5) is changed to an ascending and descending stroke, whereby the tip of the lock pin (5) and the locking groove (7) are engaged and released.