JP4817211B2 - Cover lifting device for underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid lifting device for underground structures, and is used, for example, when opening lids such as manholes and CC boxes.
[0002]
[Prior art]
In this type of conventional lid lifting device, a cam member is rotatably provided on the lid, and the cam surface is rotated by rotating the cam member in a state where the cam member is fitted into the frame. The lid body was lifted with respect to the frame body while performing a cam motion with the shelf portion, and the lid body was opened via a tool or the like.
[0003]
[Problems to be solved by the invention]
However, in such a conventional lid lifting device for an underground structure, the angle of the cam surface on the cam member is constant, so that the shelf of the frame is easily engaged with the cam surface of the cam member. In order to achieve this, the angle of the slope must be steep, and as a result, the cam movement between the cam surface and the shelf is difficult to proceed smoothly, so that the operation of lifting the lid of the underground structure is efficient. It had the inconvenience that it could not be done.
[0004]
An object of the present invention is to provide a lid lifting device for an underground structure that can solve the above-mentioned disadvantages and can easily operate a cam member with a short rotation stroke.
[0005]
[Means for Solving the Problems]
In order to achieve this object, in the lid lifting device for an underground structure according to the present invention, a frame of the underground structure, a lid attached to the frame so as to be opened and closed, and the lid A cam member disposed rotatably on the inner surface of the frame body , a cam surface on the lower surface of the cam member, a notch on the cam surface, and rotation of the cam member. In the lid lifting device for an underground structure that lifts the lid with respect to the frame body while cam-moving the cam surface with the shelf, the notch has the cam surface The cam surface is provided at a location where it first contacts the shelf and is inclined upward in the rotational direction of the cam surface and is inclined upward in the radial direction from the outer periphery of the rotating shaft of the cam member. Without making the slope angle of steep Also, it is easy to get on the shelf through the notch, and the shelf easily engages with the cam surface of the cam member.
[0006]
In this case, the ridge line of the notch may be formed along a tangent line of the outer periphery of the rotation shaft of the cam member.
[0007]
In addition, if the tip of the shelf is notched in a downward slope, the cam slope can be started more easily because the auxiliary slope with the notched cam member can easily ride on the shelf. become.
[0008]
Further, if the shelf portion is a lock engaging portion, it is not necessary to provide the shelf portion separately, so that the overall structure is simplified, and as a result, maintenance is easy.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 is a cross-sectional view of a cover lifting device for an underground structure according to the present invention, FIG. 2 is a cross-sectional view taken along arrow II in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III in FIG. It is the graph which showed the gradient of cam surface IV-IV.
[0010]
In FIG. 1, 10 is a cylindrical frame of a manhole (corresponding to the “underground structure” of the present invention) M, and 11 is a lock locking portion (corresponding to the “shelf” of the present invention). And is integrally formed in a flange shape on the inner peripheral surface of the cylindrical frame 10. Reference numeral 111 denotes a notch, which is formed in a slope shape at the distal end portion of the lock engaging portion 11. The function of the lock engaging portion 11 will be described later. Reference numeral 20 denotes the same lid, which is fitted into the cylindrical frame 10. Both the cylindrical frame body 10 and the lid body 20 are made of casting.
[0011]
Next, 21 is a shaft hole, which is formed at the peripheral edge of the lid 20. Reference numeral 23 denotes a large diameter portion, which is formed on the upper end side of the shaft hole 21. A shaft member 31 is fitted in the shaft hole 21 through a bush 32 so as to be rotatable. At this time, the head portion of the shaft member 31 is accommodated in the large diameter portion 23.
[0012]
Reference numeral 50 denotes a lock member. The shaft member 31 is inserted into the shaft hole 51 in a non-rotatable state, and is screwed and fixed by a nut member 70. Reference numeral 52 denotes a lock protrusion, which protrudes integrally with the lower end of the lock member 50. When the lock member 50 rotates and the lock protrusion 52 stops below the lock engaging portion 11 in the cylindrical frame 10, the closed state of the lid 20 is locked.
[0013]
Next, reference numeral 60 denotes a cam member that protrudes integrally with the upper end of the lock member 50. A cam surface 61 is formed on the lower surface of the cam member 60. As the locking member 50 rotates, the cam surface 61 cams between the upper end of the lock engaging portion 11 and lifts the lid 20 with respect to the cylindrical frame 10. In this case, since the notch 111 is provided in a slope shape at the tip of the lock engaging portion 11, the cam surface 61 of the cam member 60 can easily ride on the lock engaging portion 11, so that the cam motion is Easy to start.
[0014]
Reference numeral 62 denotes an auxiliary slope (corresponding to a “notch”), which is formed by notching the peripheral edge of the tip of the cam surface 61 (see FIG. 4) into a slope. The auxiliary inclined surface 62 is provided at a position where the cam surface 61 is first in contact with the lock engaging portion (shelf) 11, and is inclined upward in the rotational direction of the cam surface 61 and the cam member 60 is rotated. It is inclined upward in the radial direction from the outer periphery of the shaft. Thus, when the auxiliary slope 62 is provided at the tip of the cam surface 61 (in the direction of the tip of rotation), when the cam member 60 rotates, the top end of the lock engaging portion 11 in the cylindrical frame 10 is supported by this auxiliary member. It is easy to mesh with the inclined surface 62, and thus easily enters the cam surface 61.
[0015]
Reference numeral 71 denotes a rubber cap, which is elastically fitted to the head of the shaft member 31. The rubber cap 71 is accommodated in the large diameter portion 23 of the shaft hole 21.
Reference numeral 80 denotes a reinforcing rib integrally formed on the back surface of the lid 20.
[0016]
【Effect of the invention】
An underground structure lid lifting device according to the present invention includes an underground structure frame, a lid attached to the frame so as to be openable and closable, and a cam member rotatably installed on the lid. The cam member is provided with a shelf on the inner surface of the frame body, a cam surface is provided on the lower surface of the cam member, a notch is provided on the cam surface, and the cam member is rotated to rotate the cam surface to the shelf. In the lid lifting device for an underground structure that lifts the lid with respect to the frame while performing a cam movement with respect to the portion, the notch is provided at a location where the cam surface first contacts the shelf. In addition, the cam surface is inclined upward in the rotation direction and is inclined upward in the radial direction from the outer periphery of the rotation shaft of the cam member. ride to the ledge also through the notch Easily raised, in which the shelf unit is easily engaged with the cam surface of the cam member.
[0017]
Therefore, if this underground structure lid lifting device is used, the cam motion between the cam surface and the shelf portion is smooth in a state where the shelf portion of the frame body easily engages with the cam surface of the cam member. Therefore, the work of lifting the lid of the underground structure can be performed efficiently.
[0018]
In this case, the ridge line of the notch can be formed along a tangent line of the outer periphery of the rotating shaft of the cam member.
[0019]
In addition, if the tip of the shelf is notched in a downward slope, the cam slope can be started more easily because the auxiliary slope with the notched cam member can easily ride on the shelf. become.
[0020]
Further, if the shelf portion is a lock engaging portion, it is not necessary to provide the shelf portion separately, so that the overall structure is simplified, and as a result, maintenance is easy.
[Brief description of the drawings]
FIG. 1 is a sectional view of a cover lifting device for underground structures according to the present invention.
FIG. 2 is a view taken in the direction of arrow II in FIG.
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a graph showing the gradient of the cam surface IV-IV in FIG.
[Explanation of symbols]
M ... Manhole (underground structure)
10 ... Cylindrical frame (frame)
11 ... Lock locking part (shelf)
111… Notch (lock lock 11)
20… Lid
60… Cam member
61… Cam surface
62… Auxiliary slope (cam face notch)

Claims (4)

A frame body of an underground structure, a lid body that is attached to the frame body so as to be openable and closable, and a cam member that is rotatably installed on the lid body, and a shelf portion is provided on the inner side surface of the frame body In addition , a cam surface is provided on the lower surface of the cam member, a notch is provided in the cam surface, and the cam member is rotated to cam the cam surface between the shelf and the frame. In the lid lifting apparatus for an underground structure to be lifted with respect to the body, the notch is provided at a position where the cam surface first contacts the shelf, and is inclined upward in the rotational direction of the cam surface. In addition , the lid lifting device for the underground structure is inclined upward in the radial direction from the outer periphery of the rotating shaft of the cam member . 2. The lid lifting device for an underground structure according to claim 1, wherein a ridge line of the notch is formed along a tangent line of an outer periphery of a rotating shaft of the cam member. The device for lifting a lid of an underground structure according to claim 1 or 2, wherein a tip end portion of the shelf portion is cut downward in a slope shape. The lid lifting device for an underground structure according to claim 1, wherein the shelf portion is a lock engaging portion .

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