JPH0737018Y2 - Flat latch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention includes a latch body for locking a door to a closed position with respect to a fixed frame body such as a storage box of an electric machine instrument or a communication machine instrument. The present invention relates to a flat latch device in which a door opening / closing handle that slides a latch body backward retracts into a housing when not in use.

[Prior Art] In the conventional flat latch device disclosed in Japanese Utility Model Publication No. 57-27879, a handle is retractably housed in a front recess of a casing, and a proximal end portion of the handle is pivotally attached to a side wall of the casing by a transverse pivot. The latch body is housed in the guide portion provided on the side of the casing, and the latch body is slidably biased in the protruding direction by the spring, and the operating protrusion is provided on the back side of the base end portion of the handle. The actuating protrusion is engaged with the passive portion provided on the base end side of the latch body, and the inclined surface is provided at the tip end portion of the latch body.

In this plane latch device, when the door is closed, the tip slope of the latch body abuts on the receiving portion on the fixed frame body side, and the tip slope of the latch body is pressed by the receiving portion.

The pressing force from the receiving portion is divided into a component force that works in the length direction of the latch body and a component force that works in the thickness direction of the latch body. The former component force causes the latch body to retract along the guide portion. Although it is slid, the latter component force acts as a force for pressing the latch body against the inner surface of the guide portion, so that frictional resistance is generated against backward sliding of the latch body.

This frictional resistance not only hinders the smooth and light backward sliding of the latch body but also increases the degree of wear of the inclined surface of the tip end, thereby shortening the durability period of the flat latch device.

Increasing the angle of inclination of the tip slope reduces the component force of the latch body in the thickness direction and reduces the frictional resistance, but in that case, the engagement length between the latch body and the receiving portion becomes shorter. As a result, it will interfere with proper and stable locking of the door.

Therefore, the object of the present invention is to allow the latch body to smoothly and smoothly slide back and forth without exerting an unreasonable force that causes wear or distortion, so that the engaging length of the receiving portion of the latch body is sufficiently long. An object of the present invention is to provide a flat latch device that can be set and has excellent durability.

[Means for Solving the Problem] The following will describe with reference numerals in the accompanying drawings. In the plane latch device of the present invention, the handle 3 can be freely retracted into the front recess 2 of the casing 1 fixed to the door 17. The guide body 6 of the casing 1 accommodates the latch body 7 which is accommodated and pivotally attaches the base end portion 3a of the handle 3 to the side wall 5 of the casing 1 by the transverse pivot shaft 4 and engages and disengages with the receiving portion 19 on the fixed frame body 18 side. Then, the spring 8 urges the latch body 7 to slide in the protruding direction, and the handle 3
The operating protrusion 9 is provided on the rear side of the base end portion 3a of the
The operating protrusion 9 is engaged with the passive portion 10 provided on the base end side of the.

A fan-shaped cam plate 13 is pivotally attached to the side wall 11 at the tip of the guide portion 6 by a transverse pivot shaft 12, and an interlocking protrusion 15 fixed to the tip of the latch body 7 is engaged with a radial receiving groove 14 of the fan-shaped cam plate 13. Let
When the tip sloped surface 7a of the latch body 7 is located at the position projecting from the tip end opening 16 of the guide portion 6, the end surface portion 13a of the fan-shaped cam plate 13 is projected rearward from the tip sloped surface 7a of the latch body 7.

[Operation] As shown in FIG. 1, when the door 17 is closed, the front end of the latch body 7 is engaged with the rear surface side of the receiving portion 19 on the fixed frame body 18, so that the door 17 is closed. The fixed frame 18 is locked and locked. To unlock the door and open the door 17, the front end of the handle 3 may be hooked with a finger and the handle 3 may be pulled out from the front recess 3 of the housing 1.

As shown in FIG. 2, when the handle 3 rotates about the pivot 4, the operating protrusion 9 pushes the passive portion 10 of the latch body 7, so that the latch body 7 resists the bias of the spring 8 and the guide portion. By sliding backward along 6 and releasing the tip of the latch body 7 from the receiving portion 19, the locking / locking of the door 17 with respect to the fixed frame body 18 is released.

As the latch body 7 slides backward, the interlocking protrusion 15 of the latch body 7 pushes the inner surface of the receiving groove 14 of the fan-shaped cam plate 13,
The fan-shaped cam plate 13 rotates around the pivot 12, and the end surface portion 13a of the fan-shaped cam plate 13 is drawn into the guide portion 6. At this time, the interlocking protrusion 15 apparently moves in the radial receiving groove 14 toward the outer end.

By further pulling the handle 3, the door 17 thus unlocked is rotated in the opening direction about the hinge shaft (not shown) on the left end side. When the finger is released from the handle 3 after the door 17 is opened, the latch body 7 is slid forward by the bias of the spring 8. When the inclined surface of the tip of the latch body 7 protrudes from the tip opening 16 of the guide portion 6, the handle 3 rotated in conjunction with the latch body 7 is recessed in the front concave portion 2, and the end surface portion 13a of the fan-shaped cam plate 13 is the latch body. 7 has returned to the position protruding from the tip sloped surface 7a, and the interlocking protrusion 15 is at the inner end of the receiving groove 14.

When the door 17 is rotated around the hinge shaft in the closing direction, as shown in FIG.
The end surface portion 13a of 13 abuts on the receiving portion 19 on the fixed frame 18 side, and the fan-shaped cam plate 13 pushed by the receiving portion 19 rotates about the pivot 12.
The interlocking projection 15 of the latch body 7 is pushed by the inner surface of the receiving groove 14. Therefore, the latch body 7 slides backward along the guide portion 6 against the bias of the spring 8, and the interlocking protrusion 15 apparently moves in the radial receiving groove 14 toward the outer end portion.

The pressing force from the receiving portion 19 is converted into a force for rotating the fan-shaped cam plate 13, and most of the rotating force acts as a force for sliding the latch body 7 backward, so that the latch body 7 does not contact the inner surface of the guide portion 6. It slides smoothly and lightly without causing excessive frictional resistance.

In this manner, at the moment when the latch body 7 slides backward and the respective tip portions of the latch body 7 and the fan-shaped cam plate 13 cross the receiving portion 19 to the rear side, the latch body 7 slides forward by the bias of the spring 8. Then, by projecting from the front end opening 16 of the guide portion 6 and engaging the front end portion of the latch body 7 with the receiving portion 19 as shown in FIG. To be done. When the latch body 7 slides forward, the fan-shaped cam plate 13 pushed by the interlocking protrusion 15 is pivoted.
It rotates in the reverse direction about 12, and the end surface portion 13a returns to the position protruding from the tip end inclined surface 7a of the latch body 7.

[Embodiment] In the embodiment shown in Figs. 1 to 4, the latch body 7 is formed with a split groove portion 20 in the longitudinal direction, and the passive portion 10 is provided with the split groove portion 20.
It is composed of the inner end face of. The fan-shaped cam plate 13 is rotatably accommodated in the tip of the split groove portion 20, and is interlocked with the transverse pivot 14 to project.
Reference numeral 15 is a pin which is driven and fixed in a direction intersecting with the split groove portion 20.

The stop portion 26 projecting from the rear end of the passive portion 10 abuts on the end surface 21a of the notch 21 on the rear side of the rectangular tubular guide portion 6 to limit the forward sliding of the latch body 7. . A spring support rod 22 is provided at the base end of the latch body 7 so as to project in the longitudinal direction, and the spring support rod 22 is slidably fitted in a guide hole 24 of a rear partition wall portion 23 of the housing 1.

The biasing spring 8 of the latch body 7 is composed of a compression coil spring, and the receiving portion 19 on the fixed frame body 18 side is composed of the opening edge portion itself of the fixed frame body 18.

In another embodiment shown in FIGS. 5 and 6, the passive portion 10 is formed by a step shoulder on the outer surface of the latch body 7, and the base end portion of the latch body 7 has a blind hole for accommodating the spring 8. Formed 25. The other structure is the same as that of the above embodiment.

[Advantage of the Invention] As described above, in the flat latch device of the present invention, the guide portion 6
A fan-shaped cam plate 13 is pivotally attached to a side wall 11 at the tip of the fan by a transverse pivot shaft 12, and the latch body 7 is fitted in a radial receiving groove 14 of the fan-shaped cam plate 13.
The interlocking protrusion 15 fixed to the tip of the
When the front end of the door 17 is in a position projecting from the front end opening 16 of the guide portion 6, the end surface portion 13a of the fan-shaped cam plate 13 is projected rearward from the front end slant surface 7a of the latch body 7, so that when the door 17 is closed. The end surface portion 13a of the fan-shaped cam plate 13 comes into contact with the receiving portion 19 on the fixed frame body 18 side before the latch body 7, and the fan-shaped cam plate 13 pushed by the receiving portion 19 rotates about the pivot shaft 12. Since the fan-shaped cam plate 13 pushes the interlocking protrusion 15 of the latch body 7 on the inner surface of the receiving groove 14, the latch body 7 slides back smoothly and smoothly along the guide portion 6, so Unreasonable force acts on the cam plate 13 to excessively wear the tip sloped surface 7a and the end surface portion 13a, and the pivot shaft 12 is not distorted and deformed. Since the engagement length between the tip portion of 7 and the receiving portion 19 can be set to a necessary and sufficient length, a flat plate lathe having a firm locking function. Device is provided.

[Brief description of drawings]

1 is a horizontal cross-sectional view of a flat latch device according to an embodiment of the present invention when a door is locked, FIG. 2 is a horizontal cross-sectional view of the flat latch device when a handle is pulled out, and FIG. 1 is a sectional view taken along the line AA in FIG. 1, and FIG. 4 is a horizontal sectional view at the final stage of closing the door of the planar latch device. 5 is a sectional view corresponding to FIG. 3 of a planar latch device according to another embodiment of the present invention, and FIG. 6 is a sectional view taken along line BB of FIG. 1 ... Housing, 2 ... Front recess, 3 ... Handle,
3a ... Proximal end part, 4 ... Transverse pivot axis, 5 ... Side wall, 6 ... Guide part, 7 ... Latch body, 7a ... Tip slope, 8 ... Energizing spring, 9 ... Actuator , 10 …… Passive part, 11 …… Side wall,
12 …… Cross axis, 13 …… Fan-shaped cam plate, 13a …… End face, 1
4 …… receiving groove, 15 …… interlocking protrusion, 16 …… tip opening, 17 ……
Door, 18 ... Fixed frame, 19 ... Receiving part, 20 ... Split groove, 21 ...
… Rear cutout, 21a …… End face, 22 …… Spring support rod, 23…
… Partition wall, 24… Guide hole, 25… Blind hole for spring accommodation, 26…
... stop

Claims (1)

[Scope of utility model registration request] 1. A handle 3 is retractably housed in a front recess 2 of a casing 1 fixed to a door 17, and a proximal end 3a of the handle 3 is pivotally attached to a side wall 5 of the casing 1 by a transverse pivot shaft 4 and fixed. The latch body 7 that engages and disengages with the receiving portion 19 on the frame body 18 side is housed in the guide portion 6 of the casing 1, and the latch body 7 is slidably biased in the protruding direction by the spring 8 so that the base end portion 3a of the handle 3 is An operating protrusion 9 is provided on the back side, and the operating protrusion 9 is engaged with a passive portion 10 provided on the base end side of the latch body 7. The cam plate 13 is pivotally attached, and the interlocking projection 15 fixed to the tip end portion of the latch body 7 is engaged with the radial receiving groove 14 of the fan-shaped cam plate 13 so that the tip end sloped surface 7a of the latch body 7 serves as the guide portion 6. When the end face portion 13a of the fan-shaped cam plate 13 is protruded from the tip end opening 16 to the rear side from the tip slope 7a of the latch body 7. Planar latching device.