JPH0291996A - Structure for housing printed board unit into shelf - Google Patents

Abstract

PURPOSE:To prevent pull-out of a unit in an unnecessary extent by providing a hook member which is elastically deformed at a printed board unit. CONSTITUTION:A rail 32 is machined at a bottom plate 34 of a shelf. A printed board unit 10 is housed so that the unit can be attached and removed along the rail 32. A projection 35 is formed in front of the rail 32 in the inserting and removing directions of the printed board. The projection is formed at the bottom plate 34 so that the tip of the board is protruding on the surface of the bottom plate 34. A hook shaped elastic member 38 is attached to the unit 10 with a metal fitting 36. The metal fitting 36 has an L shape and has an attaching part 36a, a hook-shaped elastic-member attaching part 36b and an elastically deforming stopper 36c. An elastic member 38 is attached to the attaching part 36b. When the unit 10 is pulled out, the hook is slidden on the rail 32. When the hook is engaged with the projection 35, the unit cannot be pulled out furthermore. The unit does not fall from the shelf. To pull out the unit completely, a hook 38a is pushed up until the hook comes to contact with the metal stopper 36 and disengaged. When the unit is inserted, the hook readily passes the projection through a slant part 38a, and the unit can be inserted readily.

Description

[Detailed Description of the Invention] Summary: An object of the present invention is to provide a structure for accommodating a printed board unit on a shelf, in which the printed board unit is not pulled out more than necessary when attaching or detaching an optical connector. In a structure in which a printed circuit board unit to which an optical fiber from the outside of the shelf is connected by an optical fiber connector can be inserted and removed along the rail part of the shelf, A protrusion is provided on the side, and when the printed board unit is removed from the shelf, the hook part is elastically deformed so as to be locked to the above protrusion, and when the printed board unit is inserted into the shelf, the hook part is engaged with the above protrusion. The printed board unit is provided with a hook-shaped elastic member that is elastically deformed so as to pass through the printed board unit.

INDUSTRIAL APPLICATION FIELD The present invention relates to a structure for accommodating a printed board unit in a shelf, and more particularly, to a structure for accommodating a printed board unit in a shelf to which an optical fiber from outside the shelf is connected by an optical connector.

For example, in an optical transmission device that handles transmission signals of multiple channels, multiple printers connected to optical fibers are used.
By accommodating the units on a shelf and attaching a plurality of shelves to a rack, high-density packaging and improved maintainability are achieved. Each printed board unit is housed in a shelf so that it can be inserted and removed.
Attachment/detachment of optical fibers connected to each printed board unit using the optical fiber connector is performed with the printed board unit removed from the shelf by an appropriate amount. Therefore, there is a need for a housing structure for printed board units that does not apply excessive force to optical fibers when removing the printed board units from the shelf.

Prior Art FIG. 4 is a perspective view of a conventional shelf and optical fiber introduction unit. A plurality of sets of shelves and optical fiber introduction units are attached to the racks 2 and 4 in the vertical direction, and among these sets, the -set of shelves 6 and optical fiber introduction units 8 are shown. Reference numeral 10 designates a plurality of printed board units housed in the shelf 6, which are configured to be insertable and removable in the direction shown in the figure. The optical fiber 12 connected to the printed board unit 10 is connected to an opening 14 provided on the top surface of the optical fiber introduction plate 8 or an opening 16 provided on the side surface.
The optical fibers 12 housed in the optical fiber introduction unit 8 can be removed by removing the surface plate 18 attached to the front surface of the optical fiber introduction unit 8 with screws 20. The extra length can be processed. The reason why the optical fiber introduction unit 3 is provided between the shelves in this way is to define a space for accommodating the extra length of the optical fiber, and to provide the optical fiber introducing unit 3 between the shelves 6. Ventilation holes 1 provided in the surface plate 18
This is to naturally cool the device by forming a flow path for heated air through the individual shelves and the weight of the optical fiber introduction unit through 8a.

FIG. 5 is a diagram for explaining the attachment and detachment of the optical fiber to the printed board unit, and shows a state in which the surface plate of the optical fiber introduction unit 8 has been removed and the printed board unit 10 has been pulled out halfway. The optical fiber 12 is removably connected to, for example, an optical transmitting/receiving device 22 mounted on the printed board unit 10 by an optical connector 24, and by pulling out the printed board unit IO as shown in the figure, attachment/detachment work on the optical connector 24 is performed. It is now possible to do this. Note that storing and wiping the extra length 112a of the optical fiber inside the optical fiber introduction unit 8 enables the insertion and removal work of the printed board unit IO without drawing the outer optical fiber from the optical fiber introduction unit 8. This is to do so.

Problems to be Solved by the Invention With the above-mentioned conventional printed board unit storage structure, the work of pulling out the printed board unit was done only by the operator's intuition, so if the printed board unit was pulled out too far, the printed board unit could be damaged in some cases. There have been problems in that the plate unit may fall off the shelf, damaging the optical fiber, or making it complicated to re-accommodate the excess length of the optical fiber.

The present invention was created in view of the above circumstances, and an object of the present invention is to provide a structure for accommodating a printed board unit in a shelf without pulling out the printed board unit more than necessary when attaching or detaching an optical connector.

Means for Solving the Problem The above-mentioned technical problem is solved by a shelf in a structure in which a printed board unit to which an optical fiber from outside the shelf is connected by an optical fiber connector is removably inserted along the rail part of the shelf. A protrusion is provided on the front side of the rail section in the direction of insertion and removal of the printed board unit, and when the printed board unit is removed from the shelf, the hook part is elastically deformed to engage with the protrusion, and the printed board unit is attached to the shelf. This can be solved by providing the printed board unit with a hook-shaped elastic member that is elastically deformed so that the hook portion passes through the projection when inserted.

According to the configuration of the present invention, when the printed board unit is removed from the shelf, the hook-shaped elastic member is elastically deformed and the hook portion moves toward the front side of the rail portion of the shelf in the direction of insertion and removal of the printed board unit. Since the printed board unit is locked to the provided protrusion, the printed board unit cannot be pulled out more than necessary.

As a result, careless pudding)! Inconveniences such as the unit falling off and damaging the optical fiber can be prevented. In this case, the hook portion is locked to the protrusion by the elastic deformation of the hook-shaped elastic member, so if the hook-shaped elastic member is held down to prevent this elastic deformation, the hook portion can be attached to the protrusion. The printed board unit can be easily removed without being locked. In this way, the printed board unit can be removed from the shelf only by an operation based on the intention to remove it.

Also, when inserting the printed board unit into the shelf,
Since the hook-shaped elastic member is elastically deformed so that its hook portion passes through the protrusion, the printed board unit can be inserted into the shelf with a simple operation.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of a shelf and an optical fiber introducing unit showing an embodiment of the present invention, and shows a state in which a printed board unit is pulled out.

FIG. 2 is a partial sectional view of the shelf, showing a state in which a printed board unit is inserted. In these figures and FIG. 3, which will be described later, parts that are substantially the same as those in the conventional drawings are given the same reference numerals, and some explanations thereof may be omitted.

Reference numeral 32 denotes a rail portion formed by, for example, punching out the bottom plate 34 of the shelf, and the printed board unit 10 is housed in the shelf 6 along this rail portion 32 so as to be insertable and removable. If the rail portion 32 is created by the above processing method, the bottom plate 34 of the shelf can be formed by this processing.
Since an opening is formed in the opening, there is no need to form a separate ventilation hole.

35 is a protrusion provided on the front side of the rail portion 32 in the direction of insertion and removal of the printed board unit, and is constructed by attaching a suitable plate-like member to the bottom plate 34 so that its tip protrudes above the bottom plate 34. There is. Reference numeral 36 denotes a metal fitting for attaching the hook-shaped elastic body member, and by bending an L-shaped piece, this metal fitting 36 has an attachment part 36a to the printed board 10, an attachment part 36b of the hook-shaped elastic body member 38, It has a stopper R36C that limits the range of elastic deformation of the hook-shaped elastic member 38. The hook-shaped elastic member 38 is formed by bending a band-shaped plate spring member and attaching one piece thereof to the attachment part 36b of the metal fitting 36 with a screw 40, and the other piece is formed with a Z-shaped hook part 38a.

Next, the operation in this embodiment will be explained with reference to FIG. When the printed board unit 10 is pulled out from the shelf 6, the hook-shaped elastic body member 38 slides on the rail portion 32 along with the movement, and the hook portion 38a is displaced downward by the elastic force and engages with the protrusion 35. When the printed board unit 10 is stopped, the printed board unit 10 cannot be pulled out any more. Therefore, there is no risk of the printed board unit 10 accidentally falling off the shelf and damaging the optical fiber.

For example, when replacing the printed board unit 10 on a shelf, when removing the printed board unit 10 completely from the shelf, as shown in FIG.
By pressing the hook 138a until it comes into contact with the stopper 136C of the metal fitting 36 to release the lock from the protrusion 35,
The printed board unit 10 can be removed.

When inserting the removed printed board unit 10 into a new shelf, as shown in FIG. When the inclined portion formed in the portion 38a is lifted by the projection 35, the piece-shaped bullet body member 38 is easily elastically deformed and the hook n38a passes through the projection 35, so that the printed board unit 10 can be easily inserted into the shelf. Can be done.

Effects of the Invention As detailed above, according to the structure for housing the printed board unit in the shelf of the present invention, it is not necessary to pull out the printed board unit more than necessary, for example, when attaching or detaching an optical connector. This has the effect of eliminating the risk of damaging the optical fiber due to accidental dropping, which greatly contributes to improving the reliability of the optical transmission device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a shelf and an optical fiber introducing unit showing an embodiment of the present invention, FIG. 2 is a partial sectional view of a shelf showing an embodiment of the present invention, and FIG. 3 is a diagram showing an embodiment of the present invention. FIGS. 4 and 5 are perspective views of a conventional general shelf and optical fiber introducing unit. 6... Shelf, 8... Optical fiber introduction unit, 10... Printed board unit, 12... Optical fiber, 24... Optical fiber connector, 32... Rail part, 35... Projection , 38... hook-shaped elastic body member, 38a... hook portion.

Claims (1)

[Scope of Claims] A structure in which a printed board unit to which an optical fiber from outside the shelf is connected by an optical fiber connector is removably housed along the rail part of the shelf, comprising: a rail part (32) of a shelf (6); ) is provided with a protrusion (35) on the front side in the insertion/removal direction of the printed board unit (10), and when removing the printed board unit (10) from the shelf (6), the hook portion (38a) of the printed board unit (10) is attached to the protrusion (35). A hook-shaped elastic member that is elastically deformed so that the printed board unit (10) is locked into the shelf (6), and that its hook portion (38a) is elastically deformed so that it passes through the protrusion (35) when the printed board unit (10) is inserted into the shelf (6). A structure for storing a printed board unit on a shelf, characterized in that a body member (38) is provided on the printed board unit (10).