JPH042205Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a locking device for an outer manhole cover that covers the opening of a manhole.

(Prior art) Conventionally, in order to lock the attachment state of the manhole outer cover to the frame pipe, for example, a conical surface that can be fitted to the inner wall surface of the upper end of the frame pipe and the side peripheral surface of the outer cover, respectively, has been used. The outer cover can be press-fitted into the upper end of the frame tube to prevent the outer cover from being removed, or the lock plate of the locking device attached to the back of the outer cover can be hooked to the lock receiver formed on the frame tube. The outer lid was locked.

(Problems to be solved by the invention) In the case of the above-mentioned locking means, the removal of the outer cover is complicated and requires special removal equipment, or the buried pipe frame has to be dug up and processed for locking. In particular, there was a problem in that it was extremely difficult to excavate the frame pipes on roads that were frequently traveled by vehicles.

An object of the present invention is to provide a locking device that can eliminate the above-mentioned problems and eliminate the need for processing the frame tube, and can also strengthen the locked state of the outer lid.

(Means for Solving the Problems) The present invention provides a support member provided on the lower surface near the end of an outer cover fitted into a manhole frame pipe in order to make it come into contact with and separate from the inner wall surface of the frame pipe. The locking member is pivotally supported so that it can swing under its own weight and its swinging end is defined in contact with the inner wall surface, and the locking member is provided with a mechanism for changing the swinging posture of the locking member. The gist of this is a locking device that connects operating members provided in the locking device.

(Function) The device of the present invention can swing vertically against the lower surface near the end of the outer cover of the manhole, and swings the locking member, which is pivoted so as to be able to come into contact with and separate from the inner wall surface of the frame pipe, toward the inner wall surface. The locking member is operated so that the swinging end is inscribed in the frame pipe, and when an upward pressing force is applied to the outer cover, the locking member is pressed into contact with the inner wall surface in a biting manner, and the swinging fulcrum of the locking member is pressed. The structure is configured to restrict the upward movement, prevent the outer cover from being lifted, and swing the locking member toward the side opposite to the inner wall surface to separate it from the inner wall surface, thereby unlocking the outer cover from the locked state. It is something.

(Example) Next, an example of the present invention will be described with reference to the drawings.

A frame pipe 1 for a manhole is formed into a substantially cylindrical shape and is buried underground at the upper end of the manhole, and a stepped portion 4 is formed in a circumferential manner near the upper end of the inner wall surface 1a.

The disk-shaped outer cover 5 is fitted and supported to the upper end of the frame tube 1 so that it can be taken out upwards with its peripheral edge placed on the stepped portion 4 of the frame tube 1, and its lower end A locking device S is installed near the inner wall surface 1a of the tube frame 1 in order to lock the outer cover 5 to the tube frame 1. It should be noted that a plurality of locking devices, preferably two to four locking devices, are arranged on the outer lid 5 so as to be spaced apart from each other in the circumferential direction.

The support member 6 of each locking device S includes an upper plate 6a attached to the lower surface of the outer lid 5, and left and right side plates 6b, 6b suspended in parallel to the lower surface of the upper plate 6a.

In order to move it toward and away from the inner wall surface 1a of the frame tube 1, it is pivotally supported to the support member 6 via a support shaft 7 horizontally suspended near the center of the support member 6 so as to be able to swing in the vertical direction. The locking member 8, which is narrowly inserted between the side plates 6b of the supporting member 6, is formed so that its thickness gradually increases toward the front so that the center of gravity is unevenly distributed on the tip side, and there are vertical and rear openings near the rear end. recessed part 8a
is recessed into a planar shape, and the engagement shaft 9 is horizontally suspended in this recessed portion 8a, while its tip surface 8b is curved into an arcuate surface to prevent sliding with the inner wall surface 1a of the frame tube 1. It is formed with an uneven surface such as a knurled surface to increase the contact resistance. Then, the front part of the locking member 8 is swung downward by its own weight to lock the inner wall surface 1a of the frame tube 1.
The swinging fulcrum a of the lock member 8 is placed at the rear of the center of gravity of the lock member 8, and the lock member 8 is tilted upward toward the outside near the lower end of the distal end surface 8b. The retaining edge 8c is brought into contact with the inner wall surface 1a of the frame tube 1, thereby defining the lower swing end of the locking member 8. Further, the contact point b between the inner wall surface 1a of the frame tube 1 and the holding edge 8c of the locking member 8 is the swing fulcrum point a.
The distal end surface 8b of the locking member 8 swings with its arc center d on an extension of the line segment ab connecting the swinging fulcrum a and the contact point b. It is arranged behind the fulcrum a, and is set so that the length e+f, which is the sum of the length e of the line segment ad and the length f of the line segment ab, is the radius of curvature, and the retaining edge 8c of the locking member 8 is When the lock member 8 is inscribed in the frame tube 1 in opposition to the inner wall surface 1a of the frame tube 1, the radius of circular motion of the tip surface 8b of the lock member 8 is slightly longer than the length e of the line segment ab. Therefore, the downward swinging movement of the locking member 8 is restricted, and the upward movement of lifting the outer cover 5 and moving the swinging fulcrum a of the locking member 8 upward is prevented, so that the outer cover 5 It is locked when it is fitted.

An operation bolt 10 is loosely inserted into a through hole 12 that is vertically inserted into the outer cover 5 and penetrated through the upper plate 6a of the support member 6 in order to change the swinging posture of the lock member 8. A groove 11a formed at the lower end and having an inverted U-shaped cross section is engaged with the engagement shaft 9 of the locking member 8, and is screwed into the presser member 11 erected on the engagement shaft 9. The operating bolt 10 is secured to the operating bolt 10 by a snap spring 13 which is rotatably fitted into the recess 5a formed in the upper surface of the outer cover 5 and is engaged with the operating bolt 10 at the lower side of the upper plate 6a of the support member 6. When the operating bolt 10 is rotated, for example, clockwise, the holding member 11 spirals and moves upward together with the engagement shaft 9 of the locking member 8, pressing the locking member 8 against the holding edge. 8c is swung toward the inner wall surface 1a side by its own weight up to the lower swinging end that contacts the inner wall surface 1a of the frame tube 1, and is brought into contact with the frame tube 1, and with the outer cover 5 fitted to the frame tube 1. Can be locked. On the other hand, when the operating bolt 10 is rotated counterclockwise a predetermined number of times in this state, the holding member 11 is screwed back and the engaging shaft 9 of the locking member 8 is pressed down by the moving holding member 11, and the locking member 8 is The outer cover 5 relative to the frame tube 1 is swung toward the side opposite to the inner wall surface to change the holding edge 8c to a swinging posture separated from the inner wall surface 1a.
can be unlocked.

It should be noted that a pair of left and right side plates may be integrally formed to support the lock member 8 on the lower surface near the end of the outer cover 5, and a supporting member may be attached thereto.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, a support member 6 attached to the lower surface near the end of the outer cover 5 fitted into the frame pipe 1 for a manhole is formed in order to make it come into contact with and separate from the inner wall surface 1a of the frame pipe 1. The lock member 8 is pivotally supported so that it can swing under its own weight and its swing end is defined in contact with the inner wall surface 1a, and the lock member 8 has a mechanism for changing the swing posture of the lock member 8. An operating bolt 11 provided at the holder is connected to the operating bolt 11.

Therefore, the swinging posture of the lock member 8 can be easily changed by rotating the operating bolt 11 in the forward and reverse directions, which simplifies the locking and unlocking operations of the outer cover 5 with respect to the frame tube 1. The lid 5 can be easily and accurately locked to the frame tube 1, and the locked state can be easily unlocked to simplify the removal work of the outer lid 5,
Further, there is an effect that locking processing for the frame tube 1 can be eliminated.

In particular, when the lock member 8 is inscribed in the frame tube 1 and the outer cover 5 is locked, if an upward pressing force is applied to the outer cover 5 and the swinging fulcrum a of the lock member 8 is pressed upward, the lock member The retaining edge 8c of 8 presses against the inner wall surface 1a of the frame tube 1 in a biting manner, thereby locking the locking member 8.
The force that pushes up the swing fulcrum a is converted into a lateral pressing force on the frame tube 1, and as the force that pushes up the swing fulcrum increases, the force that prevents the swing fulcrum a from moving upward increases. Therefore, the locked state of the outer cover 5 can be significantly strengthened, and forced removal of the outer cover 5 can be reliably prevented.

Furthermore, when the rocking restriction on the locking member 8 is released, the locking member 8 automatically swings in the locking direction due to its own weight and comes into contact with the frame tube 1, so that the locking member 8 is prevented from being damaged due to vibrations of the outer cover 5, etc. 8 is eliminated, and the lock member 8 can be operated accurately when locking and unlocking.

(Effect of the invention) That is, the present invention has a support member provided on the lower surface near the end of the outer cover fitted in the frame pipe for a manhole, which has a lock formed to allow it to come into contact with and separate from the inner wall surface of the frame pipe. The member is pivoted so that it can swing under its own weight and its swing end is defined in contact with the inner wall surface, and the lock member is provided with a structure for changing the swinging posture of the lock member. By linking the operating members, locking processing on the frame tube can be eliminated, and the locking state of the outer lid can be strengthened.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical cross-sectional view of the main parts, FIG. 2 is a vertical cross-sectional view of the opening of a manhole, and FIG. 3 is an exploded perspective view of the locking device. 1...Frame tube, 1a...Inner wall surface, 5...Outer cover, 6
...Support member, 8...Lock member, 10...Operation bolt.

Claims (1)

[Scope of utility model registration request] A support member provided on the lower surface near the end of the outer cover to be fitted into the manhole frame pipe has a lock member formed thereon for bringing it into contact with and separating from the inner wall surface of the frame pipe, and is capable of swinging movement by its own weight. The lock member is pivoted so that its swinging end is defined in opposition to the inner wall surface, and an operating member provided for changing the swinging posture of the lock member is linked to the lock member. Locking device for manhole outer cover.