JP4035839B2 - Locking device for lid of underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid locking device for underground structures, and is used, for example, in a manhole.
[0002]
[Prior art]
As shown in FIG. 4, the conventional manhole cover body supports the lock member 90 on the back surface of the cover body 20 so as to be able to swing, and the lock member 90 is supported by the gravity of the balance weight 37 and the elasticity of the spring 52 and the like. When the valve body 91 of 90 closes the key hole 21 of the lid 20, the locking hook 92 is hooked on the locking piece 11 of the manhole frame 10, and the gravity of the balance weight 37 and the spring The locking hook 92 of the locking member 90 is released from the locking piece 11 by pushing the valve body 91 from the key hole 21 side against the elasticity of 52 or the like.
[0003]
[Problems to be solved by the invention]
However, in such a conventional manhole cover 20, since the valve body 91 is formed integrally with the lock member 90, the lock member 90 is fitted into the key hole 21. It is difficult to fix to the back surface of the lid 20 in the inserted state, and when the valve body 91 returns to the key hole 21 (when the key hole is closed) even after fixing, a stone roller or the like is placed between the frame body 10 and the like. It had the inconvenience that it was difficult to chew and return.
[0004]
An object of the present invention is to eliminate the inconvenience.
[0005]
[Means for Solving the Problems]
In order to achieve this object, in the underground structure lid locking device according to the present invention, an underground structure frame having a locking piece and a keyhole attached to the frame so as to be opened and closed are provided. And a cover member pivotably supported on the back surface of the cover member, and a valve body that covers the key hole is installed on the upper portion of the lock member and the lower portion of the lock member includes the valve member. A latching hook that is latched on the latching piece is installed, and when the valve body closes the key hole, the latching hook is latched on the latching piece, and the lock member In the lid locking device for an underground structure in which a recessed portion opened upward and on the frame body side is formed and the valve body is loosely fitted in the recessed portion, the recessed portion is configured. The valve body falls out of the recess in the U-shaped mounting piece. The retaining member for preventing, since it is installed in a state located in the front opening portion of the recess,
As a result of a gap, i.e., rattling, between the valve body and the lock member, the valve body can move independently of the lock member by the gap, and the retaining member Since the member is installed in a state where the member is located in the front open portion of the recess, the valve body can be installed in a stable state on the lock member.
[0007]
Further, a locking pin protrudes from the outer surface of the U-shaped mounting piece that constitutes the concave portion, and the retaining member is formed in a U-shape, and the vertical portions at both ends thereof are formed on the U-shaped mounting piece If the screw is fixed to the outer side surface, and a notch is provided in the vertical portion at both ends and the locking pin is hooked on the notch, the retaining member can be prevented from swinging. The lock member can be installed in a more stable and stable state.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a cover locking device for an underground structure according to the present invention, FIG. 2 is a view taken along the arrow II of FIG. 1, and FIG. 3 is a view corresponding to FIG. It is.
[0009]
1 to 3, reference numeral 10 denotes a cylindrical frame body of a manhole (corresponding to the “underground structure” of the present invention) M, and reference numeral 20 denotes a cover body. Both are manufactured by casting. The lid 20 is swingably installed on the cylindrical frame 10 via hinge means (not shown). Reference numeral 11 denotes a locking piece, which is installed below the inner wall surface of the frame 10. The function of the locking piece 11 will be described later. Reference numeral 1 denotes a lid locking device for the manhole M.
[0010]
Reference numeral 21 denotes a key hole, which is formed at the edge of the lid 20. The key hole 21 is open to the periphery of the lid 20, and its function will be described later.
[0011]
Reference numerals 22 and 22 denote bearings, which are integrally protruded from the back surface of the lid 20 through a predetermined space. The bearings 22 and 22 extend downward and have locking grooves 23 and 23 on their inner wall surfaces.
[0012]
Reference numeral 30 denotes a lock member, which is composed of a U-shaped attachment piece portion 31 and a lock member main portion 32 formed integrally with the lower portion of the U-shape attachment piece portion 31. Reference numerals 33 and 33 denote rotating shafts that project outward from the upper end of the U-shaped attachment piece 31 of the lock member 30. The lock member 30 is pivotally supported by the lid body 20 by inserting the rotary shafts 33 and 33 into the locking grooves 23 and 23 of the bearings 22 and 22, respectively. Reference numerals 51 and 51 denote bolts and nuts, which are installed in the state where they are fitted and inserted into the open ends of the locking grooves 23 and 23 in the bearings 22 and 22, respectively, and the rotation shafts 33 and 33 of the lock member 30 are It is prevented from coming off from the locking grooves 23,23.
[0013]
A concave portion 34 is formed in the middle of the U-shaped attachment piece portion 31 of the lock member 30. The recess 34 is open upward and to the frame 10 side. Reference numeral 35 denotes a connecting piece, which is integrally formed horizontally on the back side of the recess 34. The functions of the recess 34 and the connecting piece 35 will be described later.
[0014]
Reference numeral 36 denotes a locking hook, which is integrally formed with the lock member main portion 32. The locking hook 36 is for locking to the locking piece 11 of the frame body 10 to lock the closed state of the lid body 20. Reference numeral 37 denotes a wheel, which is fixed to the pins 38 and 38 below the main part 32 of the lock member.
[0015]
52 is a spring, both ends of which are hooked on the back surface of the lid body 20, and the U-shaped end of the central portion which is the other end is hooked on the back surface of the lock member main portion 32 of the lock member 30. The locking hook 36 is biased by the elastic force in a direction in which the locking hook 36 is hooked on the locking piece 11 of the frame 10.
[0016]
Next, 60 is a valve body, and the support part 61 and the valve part 62 are integrally connected in a substantially L shape. The support portion 61 is attached to the lock member 30 by loosely fitting into the concave portion 34 of the U-shaped attachment piece portion 31. A U-shaped retaining member 55 is fixed to the U-shaped mounting piece 31 with screws 56 and 56. This retaining member 55 covers the front opening of the recess 34. This prevents the valve body 60 from falling off. Reference numerals 57 and 57 denote locking pins, which protrude from the outer surface of the U-shaped attachment piece 31. The locking pins 57 and 57 are hooked to notches 58 and 58 in the vertical portions 551 and 551 of the retaining member 55 to prevent the retaining member 55 from shifting.
[0017]
A packing 70 is fastened to the upper surface of the valve portion 62 of the valve body 60 with a bolt and a nut 72 via a pressing plate 71. When the locking hook 36 is locked to the locking piece 11 of the frame body 10, the valve portion 62 is pressed against the key hole 21 of the lid body 20 via the packing 70 and closes.
[0018]
When opening the lid 20, as shown in FIG. 3, a key (not shown) is inserted from the key hole 21 so that the valve portion 62 of the valve body 60 resists the elasticity of the spring 52. The locking hook 36 of the locking member 30 is released from the locking piece 11, and the hook is hooked on the key hole 21 and pulled upward.
[0019]
【The invention's effect】
An underground structure lid locking device according to the present invention includes an underground structure frame body having a locking piece and a lid body having a key hole attached to the frame body so as to be openable and closable. A lock member is pivotally supported on the back surface of the body, and a valve body that covers the key hole is provided above the lock member, and the latch member is latched to the lower portion of the lock member. When a stop hook is installed and the valve body closes the key hole, the lock hook is hooked on the lock piece, and is opened upward and on the frame body side by the lock member. In a lid locking device for an underground structure in which a concave portion is formed and the valve body is loosely fitted in the concave portion, the valve is attached to a U-shaped mounting piece portion constituting the concave portion. A retaining member for preventing the body from falling out of the recess Because it is placed in a state located in the front opening of the concave portion,
As a result of a gap, i.e., rattling, between the valve body and the lock member, the valve body can move independently from the lock member by the gap, and the retaining member Since the member is installed in a state where the member is located in the front open portion of the recess, the valve body can be installed in a stable state on the lock member.
[0020]
Therefore, if this underground structure lid locking device is used, the valve body can be installed in a stable state on the lock member, and the lock member is fitted into the key hole. In this state, it can be easily fixed to the back surface of the lid body, and after being fixed to the lid body, when the valve body returns to the key hole, it can easily return even if it bites a stone roller or the like with the frame body. It can be done.
[0021]
[0022]
Further, a locking pin protrudes from the outer surface of the U-shaped mounting piece portion constituting the concave portion, and the retaining member is formed in a U-shape, and the vertical portions at both ends thereof are formed on the U-shaped mounting piece portion. If the screw is fixed to the outer side surface, and a notch is provided in the vertical portion at both ends and the locking pin is hooked on the notch, the retaining member can be prevented from swinging. The lock member can be installed in a more stable and stable state.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a cover locking device for an underground structure according to the present invention.
FIG. 2 is a view taken along arrow II of the lock member in FIG.
FIG. 3 is a view corresponding to FIG. 1 in a state where the valve body is opened.
FIG. 4 is a cross-sectional view of a conventional example.
[Explanation of symbols]
M ... Manhole (underground structure)
1 ... Locking device for lid
10… Frame
11… Locking piece
20… Lid
21… Keyhole
30… Lock member
31… U-shaped mounting piece
34… recess
36… Locking hook
55… Retaining member
551… Vertical section
57… Locking pin
60… Disc

Claims (2)

A frame body of an underground structure having a locking piece and a lid body having a key hole attached to the frame body so as to be openable and closable; A valve body that covers the key hole is installed at the upper part of the lock member, and a locking hook that is latched to the locking piece is installed at the lower part of the lock member, and the valve body closes the key hole. In this state, the locking hook is hooked on the locking piece , and the locking member is formed with a recess opened upward and on the frame body side, and the valve body is free to play in this recess. In a locking device for a lid of an underground structure placed in a fitted state, a retaining member for preventing the valve body from falling out of the concave portion on a U-shaped mounting piece portion constituting the concave portion Installed in a state where it is located at the front opening of the recess. Lid locking device of the underground structure according to claim. The lid locking device for an underground structure according to claim 1 , wherein a locking pin protrudes from an outer surface of a U-shaped mounting piece portion constituting the concave portion, and the retaining member is formed in a U shape. In addition, the both ends vertical portion is screwed to the outer surface of the U-shaped mounting piece portion, and a notch is provided in the both ends vertical portion, and the locking pin is hooked on the notch. Locking device for lids of underground structures.

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