JP2835946B2 - Locking device for lids such as common grooves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for locking a lid such as a common groove, and more particularly to a locking device for a lid such as a common groove for locking and unlocking by opening and closing a latch.

[0002]

2. Description of the Related Art Common grooves for electric and optical wiring, glass tubes, etc. are covered with a lid and provided with a lock mechanism for safety and for securing traffic space and necessity of maintenance and inspection. Prevent it from being opened.

As the lock mechanism, a lock body is embedded in a lid made of concrete or the like, and a latch attached to the lid is rotated in a plane at a fixed position.
As in 17860 and Japanese Patent Publication No. 6-6845, the latch is exposed from the lid by moving the latch in the axial direction in addition to the plane rotation of the latch, and the latch is provided in the common groove main body. Some engage the stops. Moving this latch in the axial direction is achieved by aligning the position of the latch of the lid with the latch of the common groove engaging the latch, etc., and by storing the latch in the lid body. Based on preventing the damage caused by hanging the weight of the lid on the latch.

[0004]

However, the above-mentioned conventional locking mechanism is such that the latch is rotated in the horizontal direction to be engaged with the latch stop of the common groove main body. Are mounted crossing each other, and in order to move up and down and rotate by a slider that locks the latch to the cam groove and the cam, it is necessary to have precision in processing the crossing portion and the cam and the non-slip, and the structure is complicated. For this reason, it is difficult to release the lock after many years of use, and above all, the strength at the time of an explosion that occurs when the high-voltage wire or the gas pipe is damaged is insufficient with the above structure.

The present invention has been made to solve the above problems, and has excellent strength without directly intersecting a latch and an operating rod as a latch shaft and without using a cam groove or a slide. It is an object to provide a locking device for a lid such as a common groove which has a simple structure and facilitates maintenance and repair.

[0006]

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems, and the gist of the present invention is that a lock main body installed on a lid body such as a common groove is screwed to an inner screw of an upper cylindrical body of the main body. An operating rod having a screw that moves up and down, a latch urged by a spring at a lower portion of the lock body so as to be able to move in and out, and one end of the operating rod and the latch contacting each other and pivotally connected by a pin. and consists of a cam member, by rotating the cam member by advancing and retracting the screw of the operating rod from the lid top to allow and out latch from the lock body by the spring, the front portion of the control rod Set the push plate
Between the push plate and the screw disposed at the rear of the operating rod.
By providing a stopper in the lock body between
The operating rod is located on the same plane as the upper surface of the lid.
Without protruding from the upper surface of the cylinder
Is a locking device for a lid such as a common groove in which the degree of access is adjusted from the lower part of the lock body .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lid of the present invention can be used not only as a lid for the above-mentioned common groove, but also as a handhole lid (manhole lid) for gas or water, etc. In addition to metal, such as iron, those made entirely of a mold and those made of concrete in which interlocking blocks are engaged with each other are conceivable.

In the lock body, an upper cylindrical body is buried in concrete or the like, and a mounting plate having a mounting hole for mounting with an anchor bolt and a nut on the lower surface of the lid is provided at a central portion, and a screw is provided on an upper portion thereof inward. , And a latch box with a built-in latch and a spring biased to move the latch in and out are integrally formed. The cross section of the latch may be polygonal, such as a square, but a round shape can increase the strength without taking a larger cross-sectional area than a square shape, and a biased force that responds to storms in the common groove The lock body can be prevented from being broken without receiving it.

The operating rod has a screw screwed into the internal screw of the cylinder at the rear outer side, and a concave part matching the convex part of the wrench rotated by a tool such as a wrench at the rear end side. There is a rod which moves forward and backward by the rotation of. The push plate which is in contact with one end of the cam is disposed at the tip of the rod.

[0010] In the latch box, a compression spring is incorporated on the side opposite to the entrance and exit side of the latch, and a force is constantly applied in the direction of pushing the latch.

A cam member opposes the pressing force of the spring. The cam member is pivotally connected to a lock body below the mounting plate by a pin so as to be rotatable. The other end opposite to the side where the one end is in contact is inserted from the upper slot of the upper part of the latch, and is brought into contact with the rear part of the latch.

In the case where the cross section of the latch is circular, the lower part of the lock body is welded or glued to the mounting plate whose upper end is circularly formed by using an existing T-shaped joint, in addition to the above advantage in terms of strength. There is an advantageous surface to join, but if the latch cross section is square, the latch box will be joined to the mounting plate along the direction of entry and exit of the latch, so there are more joints than when the above T joint is joined, This joint is strong against explosions in the common gutter.

A stopper pin is projected between the tip of the screw in the lower portion of the cylinder and the push plate to regulate the vertical movement width of the operating rod, thereby adjusting the rotation range of the cam member, that is, the amount of movement of the latch. .

The lower portion of the latch box projects from the lower slot groove of the screw latch to regulate the amount of movement of the latch similarly to the stopper pin, and also to stabilize the engagement relationship between the latch and the latch box.

[0015]

When locking the lid to the common groove, cover the lid with the operating rod in advance with the screw hitting the stopper pin, that is, with the latch housed in the latch box. The lock is completed when the push plate contacts the stopper pin, that is, the latch is locked in the latching hole or groove of the body of the common groove. To release the lock, the reverse operation is performed.

When the latch is released, the operating rod has entered the cylinder, and a hanging bolt is inserted into the internal screw behind the screw that has appeared in the cylinder, so that the heavy-weight lid can be taken in and out with a tool or heavy equipment.

When the high-pressure wire or gas pipe in the common groove explodes in the groove due to damage or the like, the periphery of the lid becomes an inverted trapezoidal shape and fits into the mortar-shaped common groove. In addition, since the latch and the hole or groove of the common groove are loosely fitted, the blast instantaneously blows out from between the lid and the common groove to prevent the lid from scattering.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first preferred embodiment of the present invention will be described with reference to FIGS.

The device of the present invention is traded as a longitudinal sectional view in FIG. 2, a plan view in FIG. 3, and a left side view in FIG. 4. FIG. The cylindrical body 3 was mounted in a state of being buried in the concrete with bolts and nuts (not shown) through mounting holes 8 of a mounting plate 4 provided on the lower surface of the lid 2 so as to be flush with the upper surface of the lid 2 made of concrete. FIG. In this case, the lid body is tapered at its periphery to form an inverted trapezoid, and is fitted in a mortar-shaped common groove that is tapered with this.

The lock body 1 comprises a cylindrical body 3 having an inner screw 7 provided on an upper portion of a mounting plate 4 and a latch box 6 having a latch 5 provided at a lower portion of the mounting plate 4 so as to be able to enter and leave.

A screw 10 provided at the rear of a rod-shaped operating rod 9 is screwed into the inner screw of the cylindrical body 3 welded to the upper part of the mounting plate 4 so as to be able to advance and retreat in the vertical direction. A triangular concave portion 17 for fitting a convex portion to a wrench (not shown) is provided at the rear end of the operating rod 9. Further, a circular push plate 11 is integrally provided at the tip of the operating rod 9, and the width of advance and retreat of the operating rod is such that the rear end of the operating rod and the upper surface of the cylindrical body when retracted most, ie, a concrete lid In order to be flush with the body, the screw 10 is moved so that the latch 5 is completely stored in the latch box 6 when the operating rod is advanced most.
And a stopper pin 12 projecting into the cylindrical body 3 between the
Is provided.

The latch box 6 welded to the lower part of the mounting plate 4 has a pin 13 penetrating the latch box 6 at the upper part of the box.
A rack 14 in the shape of a letter is pivotably mounted on the push plate 11, and the lower end of the rack 14 is in contact with the inner rear end of the latch 5. The rack 1 is located above the latch 5.
4 is provided with a slot 15 which is rotatable. A compression spring 16 is built in between the inner surface of the box 6 and the outer surface of the rear of the latch 5 at the rear inside of the lower portion of the latch box 6, and adjusts the amount of the latch 5 to be moved in and out according to the amount of rotation of the rack 14. Further, a screw 19 fitted in a slot 18 for adjusting the width of the rack 14 is provided below the latch 5.

The case where the apparatus of the present invention having the above-described structure is used as a lid 2 in a common groove will be described below.

In advance, the operating rod 9 is brought into contact with the screw 10 and the stopper pin 12, that is, the rack 14 is depressed against the compression spring 16 so that the latch 5 is pressed.
In a state in which is stored in the lock body 1, a suspension bolt (not shown) is screwed to the inner screw 7 of the cylindrical body 3 (normally, the device of the present invention is installed at four places inside the lid 2). ), A wire connected to the suspension bolt is hung on a tool, and fitted to a location where the lid of the common groove is located.

Then, the operating rod 9 is retracted by the screw 10 so that the push plate 11 and the stopper pin 12 are in contact with each other.
That is, the cam 14 is pushed upward by the compression spring 16 and at the same time, the latch 5 is projected from the latch box 6 so that a hole or a groove (not shown) provided in the common groove is provided.
The lock is completed by fitting with a little play in.

FIGS. 5 to 9 show a second embodiment of the apparatus of the present invention. FIG. 5 is a perspective view showing the apparatus of the present invention used for a lid of a concrete common groove, and FIG. 7 is a plan view of the same, FIG. 8 is a central vertical sectional view of FIG. 6, and FIG.
7 is a right side view of FIG.

The difference between this embodiment and the first embodiment is that the latch box 106 welded to the lower part of the mounting plate 4 of the lock body is formed into a T-shaped joint, and the one end where the compression spring is housed is viewed. It is blind, and the other end is that a cylindrical latch 105 can be freely inserted and removed from a latch box 106.

In this embodiment, the mounting plate 4 and the latch box 1
06 is welded to the upper part of the T-shaped joint and the place where the cam member is pinned, and as in the first embodiment, the lower part of the mounting plate is extended along the direction in which the latch enters and exits. Welding strength against blast from below is lower than that of the lock box with the latch box welded. However, since the latch of the second embodiment is round, there is no twist in the force applied to the latch by the blast as in the square of the first embodiment, and the cross-sectional area of the member is larger than that of the square. Latch strength is also improved.

The operation method of the present invention in the second embodiment is the same as that in the first embodiment.

[0030]

According to the present invention, the latch shaft (operating rod) and the latch do not intersect and are separated from each other, so that the blast does not break at the intersection. Further, since the cam member is made of a T-shaped flat plate, the strength is higher than using a grooved cam or a slide. In addition, the number of steps for making each part is small, the mechanism is simple, and maintenance and maintenance are excellent.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view showing a state where a first embodiment of a lock device of the present invention is attached to a lid.

FIG. 2 is a longitudinal sectional view of a lock device used first.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a left side view of FIG. 2;

FIG. 5 is a partially cutaway perspective view showing a state where a lock device of the present invention as a second embodiment is attached to a lid.

FIG. 6 is a longitudinal sectional view of the lock device used in FIG. 5;

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a sectional view taken along line A-A 'of FIG.

FIG. 9 is a right side view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lock body 3 Cylindrical body 4 Mounting plate 5, 105 Latch 6, 106 Latch box 7 Inner screw 9 Operating rod 10 Operating rod screw 11 Operating rod pressing plate 12 Stopper 13 Pin 14 Cam member 16 Spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E02D 29/14 E03F 5/04 E05B 65/00 H02G 9/10

Claims (1)

(57) [Claims] 1. A lock body installed on a lid body such as a common groove, an operation rod having a screw which is screwed on an inner screw of an upper cylindrical body of the body to move up and down, and a spring below the lock body. A latch that is biased by
A cam member pivotally connected to the operating rod and the latch at one end thereof by a pin, and the screw of the operating rod is moved forward and backward from an upper portion of the lid to rotate the cam member and rotate the spring. To allow the latch to enter and exit from the lock body, and provide a push plate at the tip of the operating rod.
Between the screw and the screw located at the rear of the operating rod
By providing a stopper inside the main body, the operation rod
The cylinder of the lock main body arranged on the same plane as the upper surface of the lid body
Lock the latch without protruding from the top of the body
A locking device for the lid, such as a common groove, whose degree of entry is adjusted from the lower part of the body .