JP3162353U - Manhole cover locking device - Google Patents

Abstract

A locking device for a manhole cover that prevents the locking device attached to the manhole cover from being loosened by vibration of a traveling vehicle or the like is provided. A flange plate attached to a lower surface of a locking hole provided in a manhole cover, a cylinder hole provided in the flange plate, an upper side of a cylinder chamber provided in the center, a flange receiving step portion 22 and a lower portion. A claw receiving step 23 is provided, a large-diameter locking hole 24 is formed in the lower portion of the claw receiving step, an engagement groove 28 is provided in the locking hole, and a cylinder lock 61 is attached to and detached from the cylinder chamber. Accommodate as possible. A guide groove portion 32 having a substantially quarter circumference is formed at the lower end in the lower surface recess 14 provided at the lower portion of the flange plate 12 to which the upper cylinder 20 to which the cap lid 65 is detachably attached is attached, and is latched inside. An actuating shaft 35 constituting an actuating portion, a locking piece 47 attached in a direction perpendicular to the axial center direction of the actuating shaft, a spring 45 is repelled between the locking piece and the actuating shaft 35, and the lower end of the lower cylinder 30 The bearing part 53 is attached to. [Selection] Figure 3

Description

  The present invention relates to a locking device for a manhole cover that is mainly attached to a common groove, an electric wire common groove, or the like.

  Conventionally, in order to connect / branch or inspect lifelines buried underground such as gas pipes, water pipes, electric power / telephone / optical communication cables, etc., inspections, repairs of failures, etc. A manhole which is an opening for work is provided. An openable / closable manhole cover is attached to the manhole, and a locking device is attached to the manhole cover to prevent mischief, theft, or destruction.

  Many of the locking devices are combined with a plurality of different types of locking means for safety. Usually, the lower stage is a latching means that engages with a latching hook provided on a receiving frame of a manhole, and the middle stage is the latching means. A cylinder lock that can be taken out to prevent illegal operation, and a locking device having a cap lid for preventing the cylinder lock from being taken out are attached to the upper stage. These different types of locking means perform an opening / closing operation using a dedicated opening / closing jig.

  Many of the locking means constituting the locking device are configured to lock and unlock by moving the arm shaft up and down by screwing means, and the locking means is screwed into the cylinder. In addition, the cap lid attached to the uppermost stage is opened and closed with a special screwdriver, which is a metal drop lid that is attracted by a magnet and taken out to the outside, and a metal lid that has a screw groove on the inner surface. Locking devices are known.

JP 2001-140520 A JP-A-2005-61202

  The manhole cover provided with the locking device is a cover body that is loosened due to vibration or impact transmitted from the wheel of the passing vehicle, the arm shaft is rotated and unlocked, or is attached to the uppermost stage. May come off due to vibration, or the screw of the cylinder housing the locking device may loosen and the locking means may come off. In particular, when the metal lid is removed from the manhole cover and rolled onto the road, it may cause an accident that may cause it to jump off the wheel of the traveling vehicle and collide with a passing vehicle or passerby. It was dangerous.

  Furthermore, the conventional manhole cover is attached with, for example, three locks arranged at equal intervals, and the lock is of a type that tightens a screw, so that vibrations and tire rotation transmitted when the vehicle travels on the manhole cover Due to the force or the like, there is a problem that the threaded portion fixing the latching piece to be rotated is loosened, and the latching piece to be locked or unlocked is loosened.

  The present invention is a locking device formed by combining different types of locking means in multiple stages, including preventing theft, and preventing the locking device attached to the manhole cover from coming off due to vibration transmitted from the traveling vehicle, tire rotation force, etc. Of course, in particular, there is no threaded part in the component part of the locking device to prevent loosening due to vibration or impact, etc. The lid attached to the upper end is made of a non-metallic rubber member and should come off. Accidentally falling on a road and jumping off the wheel of a traveling vehicle to hit another vehicle or hitting a passerby increases safety, and the rear part of the manhole cover is pivotably attached to a receiving frame. However, it is intended to be locked with one lock attached to the front part.

  In order to solve the above-mentioned problems, the present invention pivots the rear part of the manhole cover 1 attached to the opening 5a of the receiving frame 5 attached to the common groove A so as to be openable and closable by the support shaft part 3, and the manhole cover A lock mounting hole 2 is provided at the front, and the cylinder lock 61 can be taken out above the hole 13 provided in the center of the flange plate 12 mounted on the lower surface of the front end of the manhole cover so as to match the lock mounting hole. An upper cylinder 20 to be accommodated and a lower cylinder 30 having a guide groove 32 at the lower end below the hole are fixed on the same axis, and a bearing portion 53 is fixed to the lower end in the lower cylinder in the circumferential direction. A latching operation portion C, which springs a spring 45 between a fixed operation shaft 35 and a locking piece 47 that is releasably latched to a latching hook 6 provided on the receiving frame, can be moved up and down and rotated. It is characterized by being provided in. In addition, the upper cylinder 20 has a hook receiving step portion 22 on which an engaging hook portion 62 of the cylinder lock is hooked on an upper portion of a cylinder chamber 21 provided therein, and a locking claw portion 63 of the cylinder lock on the lower portion. A claw receiving step portion 23 is provided, and the head of the operating shaft 35 is placed in an engagement groove portion 28 provided between chamfer plates 27 and 27 that are paired with a locking hole 24 formed in the lower portion of the claw receiving step portion. The part 36 is provided so as to be engageable. Further, the lower cylinder 30 is formed with a guide groove 32 opened at a lower end in a substantially quarter circumference, and an operating shaft 35 constituting a latching operating portion C in the lower cylinder and an axis of the operating shaft. A locking piece 47 attached in a direction perpendicular to the direction, a spring 45 is repelled between the locking piece and the operating shaft 35, and a bearing 53 is fixed to the lower end of the lower cylinder 30. . Furthermore, the operating shaft 35 is engaged with an engaging groove 28 provided on the lower side of the upper cylinder 20 in parallel with both sides of the fitting recess 37 provided in the center of the upper surface of the head 36. And is inserted into a chamfered shaft 40 engaged with a shaft hole 49 provided in a base portion 48 of the locking piece 47 and a hole 54 of the bearing portion 53 below a cylindrical portion 39 provided in the lower portion of the head portion 36. The guide shaft 41 is connected to the same axis, and the operating shaft 35 is attached upward by a spring spring 45 which is elastically projected between the lower surface of the head 36 and the upper surface of the base 48 of the locking piece 47. It is characterized in that it is pivotally supported so as to move up and down and turn. Further, the locking piece 47 is formed so that the shaft hole 49 of the base portion 48 is fitted to the chamfered portion 40 of the operating shaft 35 so as to be movable in the guide groove portion 32 of the lower cylinder 30 as the operating shaft 35 rotates. When the locking piece is in the locking position, the head 36 of the operating shaft 35 is engaged with the engaging groove 28 provided in the locking hole 24 of the upper cylinder 20 and is urged upward by the spring 45. It is characterized by locking. Furthermore, the opening / closing handle 56 is provided with a fitting convex portion 58 fitted to the fitting concave portion 37 provided in the head portion 36 of the operating shaft at the lower end of the operation shaft 57, and is continuously guided to the fitting concave portion. A drainage port 43 through which drainage flows down is provided in the shaft part 41. Further, the cap lid 65 is made of a hard rubber material, and the latch receiving portion 66 provided on the inner peripheral surface and the latch protrusion 26 provided on the outer peripheral surface of the upper cylinder 20 are detachably fitted, A locking projection 67 is provided at the center.

  As described above, the present invention does not have a threaded portion that loosens due to vibration from a vehicle traveling on a manhole cover or a tire rotational force, and the head 36 of the operating shaft 35 that constitutes the latching operating portion C is provided as an upper cylinder. 20 is engaged with the engagement groove 28 provided at the lower end of the belt 20 and is urged upward by the spring 45 to be locked, so that there is no risk of loosening due to vibration from the traveling vehicle, tire rotational force, etc. It can be securely locked without any problems. Further, the cap lid 65 is formed of a hard rubber material, and the latch receiving portion 66 provided on the inner surface of the latch projection 26 provided on the upper cylinder 20 is engaged, so that the vibration from the traveling vehicle and the tire rotational force are applied. It can be prevented from jumping out, and even if it escapes and jumps out, it is made of a hard rubber material, so it is safe without any serious accident even if it hits another vehicle or a passerby. In addition, since the cap lid made of a hard rubber material is in close contact with the outer side of the upper cylinder, even if vibration is applied from the outside, the rubber material absorbs resonance such as vibration and reduces the generation of noise. There are advantages to having. Further, without using a plurality of locks, the rear part of the manhole cover can be pivotally supported by the support shaft part, and can be mounted without loosening by using one lock attached to the front part of the manhole cover. Therefore, there is an advantage that the cost when installing the manhole cover can be further reduced.

It is sectional drawing of the state which attached the locking device to the manhole cover. It is a principal part expanded sectional view of a locking device. It is a center sectional view showing the locked state of a locking device. It is a top view of a locking device. It is a disassembled perspective view of a locking device. It is a center longitudinal cross-sectional view of an upper cylinder. It is a bottom view of an upper cylinder. It is sectional drawing which fractured | ruptured the operating shaft partially. It is sectional drawing which fractured | ruptured the locking piece partially. It is a front view of an opening / closing handle. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 showing a locked state. It is sectional drawing of the state which inserted the opening-and-closing handle from the upper cylinder of the locked state, and pushed down the operating shaft. It is center sectional drawing of the locking device which shows an unlocked state. FIG. 14 is a sectional view taken along line BB in FIG. 13 showing an unlocked state.

  FIG. 1 is a sectional view showing a state where a locking device is attached to a manhole cover, FIG. 2 is an enlarged sectional view of a main part of the locking device, and FIG. 3 is a central view showing a locking state of the locking device. 4 is a plan view of the locking device, FIG. 5 is an exploded perspective view of the locking device, FIG. 6 is a central longitudinal sectional view of the upper cylinder, FIG. 7 is a bottom view of the upper cylinder, and FIG. FIG. 9 is a partially cutaway sectional view of the locking piece, FIG. 10 is a front view of the opening / closing handle, FIG. 11 is a sectional view taken along line AA in FIG. 3 showing the locked state, and FIG. Sectional drawing of the state which inserted the opening-and-closing handle from the upper cylinder of this, and pushed down the action | operation axis | shaft, FIG. 13 is a center sectional view of the locking device which shows an unlocked state. A support shaft portion 3 connected to the rear portion of the manhole cover 1 that is rotatably mounted is pivotally attached to the receiving frame 5 at an upper portion of the opening portion 5a of the receiving frame 5 attached to the common groove A. In this case, the support shaft portion may be detachably mounted from the receiving frame as necessary. At the front part of the manhole cover, a lock mounting hole 2 is provided penetrating in the vertical direction. Further, the locking device 10 having the manhole cover takes out the cap cover 65 and the cylinder lock 61 inside the flange plate 12 formed of a non-magnetic material having corrosion resistance, for example, stainless steel. An upper cylinder 20 that can be accommodated is fixed, and a lower cylinder 30 that accommodates a latching operation part C as locking means is fixed to the lower part of the flange plate 12 on the same axis as the upper shaft.

  As shown in FIGS. 2 and 4, a cylindrical hole 13 for fitting the lower end of the upper cylinder 20 is provided in the center of the flange plate 12, and a lower surface recess 14 for attaching the lower cylinder 30 is formed on the same axis center at the center of the lower surface. The screw holes 15, 15 for screwing the screw shafts 16 for attaching the flange plate 12 to the manhole cover 1 are provided at left and right symmetrical positions.

  In FIG. 5, the upper cylinder 20 is provided with a cylinder chamber 21 for accommodating a cylinder lock 61 at the center of the inside thereof, and a locking step portion 22 for locking a flange 62 of the cylinder lock is formed at the upper portion of the cylinder chamber. A claw receiving step 23 for locking the locking claw 63 of the cylinder lock is provided in the lower part of the chamber 21, and a large-diameter locking hole 24 is formed in the lower part of the claw receiving step (FIG. 6). One or a plurality of latching protrusions 26 on which the cap lid 65 is latched are provided on a substantially intermediate outer peripheral surface portion of the cylinder 20.

  A pair of chamfer plates 27 and 27 are positioned in parallel to each other at opposite positions on the inner wall surface of the locking hole 24 provided in the lower end of the upper cylinder 20 and fixed by welding or the like. , 27 is provided with an engaging groove 28 for engaging the head 36 of the operating cylinder 35.

  As shown in FIGS. 2 and 5, a guide groove 32 is formed on the bottom surface of the lower cylinder 30 to have a length of a quarter circumference, and the width of the connecting portion 51 of the locking piece 47 is formed at both ends of the guide groove. The locking piece 47 can be rotated 90 degrees in the horizontal direction by notching wide outwards by a half length.

  The opening direction of the guide groove 32 is a locked state in which the engagement groove portion 28 provided at the lower end of the upper tube 20 and the engagement step portion 38 provided at a lower level on both sides of the head portion 36 of the operating shaft 35 are engaged. In addition, when the locking step portion 38 provided on the head portion 36 of the operating shaft 35 is orthogonal to the engaging groove portion 28, the unlocking state is established, and the lower cylinder 30 having the guide groove 32 and the The upper cylinder 20 is provided on the same axis.

  As shown in FIG. 5, the latching operation portion C includes an operation shaft 35 that is vertically movable and rotatably mounted in a lower cylinder 30 formed of a metal material having corrosion resistance such as stainless steel, and the operation shaft. A spring 45 that urges upward and a locking piece 47 that is attached to the lower portion of the operating shaft 35 in a direction perpendicular to the shaft portion 41 are accommodated, and a bearing portion 53 is provided at the lower end of the lower cylinder 30. It is fixed and enclosed in the lower cylinder 30.

  As shown in FIG. 8, the operating shaft 35 is provided with a rectangular locking recess 37 at the center of the upper surface of a columnar head 36 provided at the upper end, and the operation shaft 35 is located at a position one step lower than the upper peripheral edge of the head 36. Locking step portions 38, 38 are formed by cutting out in parallel with the opposite sides of the locking recess 37. A chamfered portion 40 formed in a square shape for fitting the shaft hole 49 of the locking piece 47 through a cylindrical portion 39 provided at the lower portion of the operating shaft 35 having the head portion 36, and below the chamfered portion. A guide shaft portion 41 that is inserted into the hole 54 of the bearing portion 53 is integrally formed, and a drain port 43 that allows sludge water to flow downward into the guide shaft portion 41 is formed continuously with the locking recess 37. It is provided.

  The spring 45 springed between the grip portion 36 of the operating shaft 35 and the locking piece 47 has an upper end abutting against a spring groove 42 provided on the lower surface of the head 36 of the operating shaft 35 and a lower end of the locking piece 47. It is made to contact | abut to the spring stop groove part 50 provided in the upper surface of the base 48. FIG. The spring groove portions 42 and 50 are not necessarily required, and may be brought into direct contact with the lower surface of the head portion 36 and the upper surface of the bearing portion 53. Due to the elastic force of the spring 45, the locking piece 47 is biased toward the lower bearing portion 53, and the operating shaft 35 is biased upward.

  Therefore, the locking step portions 38 provided on both sides of the head portion 36 of the operating shaft engage with the engaging groove portion 28 provided at the lower end of the upper cylinder 20 and are urged by the spring 45 to maintain the locked state. Therefore, the locked state can be reliably maintained without the head portion 36 of the operating shaft 35 coming off the engaging groove portion 28 and jumping out due to an impact caused by vibration or tire rotational force during vehicle passage.

  As shown in FIGS. 5 and 9, the locking piece 47 is provided with a rectangular shaft hole 49 that fits the chamfered portion 40 of the operating shaft 35 in the center of the base portion 48 provided at one end, and the upper surface of the base portion. A spring groove portion 50 is formed on a concentric circle, and a latching head portion 52 is integrally formed via a connecting portion 51 in the centrifugal direction of the base portion 48.

  As shown in FIG. 10, the opening / closing handle 56 is formed in a substantially T shape, and is provided with a fitting convex portion 58 having a square cross section such as a square at the lower end of the operation shaft 57 provided in the vertical direction. On one side, a cylinder key 59 for opening and closing the cylinder lock 61 is detachably suspended by any means to prevent the cylinder key 59 from being lost during work, and a magnet 60 is attached to the other end.

  As shown in FIGS. 3 and 5, the hook receiving step 62 provided at the upper end of the cylinder chamber 21 is locked to the locking hook 62 provided at the upper end of the cylinder lock 61, and the claw receiving step provided at the lower portion of the cylinder chamber is provided. A locking claw 63 provided on the lower portion of the cylinder lock is rotated on the portion 23 so as to protrude in the centrifugal direction and hooked so that the cylinder lock cannot be taken out from the cylinder chamber 21.

  The cylinder lock 61 is configured such that a locking claw portion 63 inserted and rotated by inserting a cylinder key 59 into a key hole provided on the upper surface is engaged with and disengaged from a claw receiving step portion 23 provided on the lower surface of the cylinder chamber 21. The lock can be taken in and out of the cylinder chamber 21. That is, when the cylinder lock 61 is accommodated in the cylinder chamber 21, the fitting convex portion 58 of the opening / closing handle 56 for operating the operating shaft 35 cannot be inserted, and the operating shaft 35 cannot be rotated. It is safe.

  The cap lid 65 that covers the upper cylinder 20 is formed of a hard rubber made of natural rubber or synthetic rubber having good weather resistance in a cap shape. As shown in FIGS. A latch receiving portion 66 detachably fitted to the latch protrusion 26 provided on the wall surface is provided on the inner surface, and a locking projection 67 is integrally formed at the center of the upper surface. Covering the upper cylinder 20 with a hard rubber cap lid 65 has the effect of preventing vibrations transmitted from the vehicle traveling on the manhole lock and the generation of resonance noise due to tire rotational force, etc., thereby reducing vibration and noise. There is an advantage of having an action.

  Hereinafter, the operation of this embodiment will be described. As shown in FIG. 1, the manhole cover 1 is pivotally supported by a support shaft portion 3 having one end attached to the locking device 10 and the other end attached to the receiving frame 5. Yes, when the manhole cover is in the locked state, the lock head 52 of the locking piece 47 of the latching operation portion C is located below the latching hook 6 provided on the wall surface of the receiving frame 5 attached to the common groove 6, and the manhole Even if the lid is to be lifted upward, the lock head 52 of the locking piece 47 cannot be lifted upward by being locked to the latching hook 6.

  The unlocking operation of the locking device 10 is performed by first removing the cap lid 65 from the upper cylinder 20 and then operating the cylinder lock 61 in the cylinder chamber 21 with the cylinder key 59 attached to the opening / closing handle to The cylinder lock 61 is removed from the cylinder chamber 21 by removing it from the claw receiving step 23 of the upper cylinder 20.

  When the cylinder lock 61 is taken out from the cylinder chamber 21 of the upper chamber 20, a square shape such as a square provided on the upper surface of the head of the operation shaft 35, which is the main member of the latch operation portion C, is provided in the cylinder lock 21. The fitted recess 37 can be directly confirmed. Next, the fitting convex portion 58 of the opening / closing handle 56 is fitted into the fitting concave portion 37, the operating shaft 35 is rotated, and the locking piece 47 is rotated 90 degrees to control the locked or unlocked state. Can do.

  The cylinder lock 61 is separate from the locking device 10 and can be exchanged with another new cylinder lock periodically or when necessary. By exchanging this cylinder lock with a more accurate one, it is possible to maintain a higher level of safety.

  As shown in FIGS. 11 and 12, the latching operating portion C as the main locking means is provided with an operating shaft in an engaging groove portion 28 formed by fixing the chamfer plates 27 and 27 in the locking hole 24 of the upper cylinder 20. A locking step 38 provided on the upper surface of the head 36 of the head 35 is engaged, and the operating shaft 35 is biased by a spring 45 from below, so that it is locked and rotates integrally (FIG. 4). .

  In order to unlock the latching operation portion C, as shown in FIG. 12, a rectangular fitting recess 37 provided at the center of the head portion 36 of the operation shaft 35 visible on the bottom surface in the cylinder chamber 21 from which the cylinder lock is taken out is provided. The fitting convex portion 58 provided at the lower end of the opening / closing handle 56 is fitted, the opening / closing handle 56 is pushed down in the direction of the arrow against the elastic force of the spring 45, and the head 36 of the operating shaft is moved to the upper cylinder 20. After being disengaged from the engaging groove 28, the opening / closing handle 56 is turned 90 degrees to be in an unlocked state (FIG. 14).

  As shown in FIGS. 13 and 14, the operating shaft 35 is rotated by the opening / closing handle 56 to rotate the locking piece 47 from the lower surface of the latching hook 6 to the unlocked position, and then the opening / closing handle 56 is pulled out to apply a pressing force. When it is eliminated, the rotating shaft 35 is pushed upward by the elastic force of the spring 45, the upper surface of the head portion 36 is the lower surface of the chamfer plate 27 of the upper cylinder 20, and the engaging step between the engaging groove 28 and the head portion 36. The part 38 is brought into contact with and locked in a perpendicular direction. That is, when the operating shaft 35 is rotated, the engaging groove portion 28 and the engaging step portion 38 provided in the engaging hole 24 are positioned in a right angle direction, and the head portion 36 abuts the lower surface of the chamfer plate 27 and unscrews. It becomes a locked state and the manhole cover 1 can be opened.

  In order to lock the manhole cover 1 again, the lock head 52 of the locking piece 47 is positioned on the lower surface of the latching hook 6 by pushing down and rotating the operating shaft 35 with the opening / closing handle 56 and then turning the opening / closing handle 56. When pulled out, the locking step portion 38 of the head portion 36 is engaged with the engagement groove portion 28 of the upper tube 20 and locked by the elastic force of the spring 45. Next, after the cylinder lock 61 is housed in the cylinder chamber 21 of the upper cylinder 20 and the cylinder key is operated, the locking claw 63 is hooked on the claw receiving step 23 provided below the cylinder chamber 21 and locked. The cylinder key 59 is removed, and the cap lid 65 is placed on the outer side of the upper cylinder 20 so that the fitting convex part 26 of the upper cylinder 20 and the fitting concave part 66 of the cap lid 65 are fitted, thereby dissimilar locking means. To complete the locking operation.

  Conventionally, a metal cap lid made of a magnetic material is attached to the upper outer side of the upper cylinder 20, but the cap lid escapes due to vibration or tire torque generated when the vehicle passes over the manhole lid. There is a risk of jumping out. In that case, when the material of the cap lid is made of metal, it may become a weapon, and there is a risk of causing a serious accident when it collides with a passing vehicle or a passerby. Therefore, the cap lid is made of non-metallic material such as hard rubber, so even if it escapes from the manhole lid and jumps out and collides with a vehicle or a passerby, it will not be a weapon for the vehicle or a passerby. is there. In addition, if a cap body made of hard rubber or the like is placed on the outside of the upper cylinder, it will reduce noise by absorbing noise caused by vibrations and shocks transmitted from the vehicle traveling on the manhole cover. Have the effect of In addition, since a plurality of manhole covers, for example, three locks, can be fixed with a single lock, the cost can be reduced when a manhole cover is installed. Have.

DESCRIPTION OF SYMBOLS 1 Manhole cover 2 Lock attachment hole 3 Actuation shaft part 5 Receiving frame 5a Opening part 6 Latch lock 12 Flange plate 13 Hole part 20 Upper cylinder 21 Cylinder chamber 22 鍔 Step part 23 Claw step part 24 Locking hole 26 Locking protrusion Part 27 Chamfering plate 28 Engaging groove part 30 Lower cylinder 32 Guide groove 35 Actuating shaft 36 Head part 37 Engaging recess part 38 Locking step part 39 Cylinder part 40 Chamfering part 41 Guide shaft part 45 Spring 47 Locking piece 48 Base part 49 Axis Hole 53 Bearing portion 54 Hole 56 Opening / closing handle 57 Shaft portion 58 Fitting convex portion 62 Locking collar portion 63 Locking claw portion 65 Cap lid 66 Latch receiving portion 67 Locking convex portion A Joint groove C Latching operation portion

Claims (7)

  The rear part of the manhole cover (1) attached to the opening (5a) of the receiving frame (5) attached to the common groove A is pivotably pivoted by the support shaft part (3), and the front part of the manhole cover Is provided with a lock mounting hole (2) above the hole (13) provided in the center of the flange plate (12) to be attached to the lower surface of the front end of the manhole cover so as to match the lock mounting hole. 61) An upper cylinder (20) that can be taken out and a lower cylinder (30) having a guide groove (32) at the lower end below the hole are fixed on the same axis, and a bearing portion at the lower end. Between the operating shaft (35) fixed in the circumferential direction in the lower cylinder to which (53) is fixed, and the locking piece (47) for releasably latching the latching hook (6) provided on the receiving frame It is characterized in that a latching operation part C having a spring (45) springed on it is provided so as to move up and down and turn. Locking device of the manhole cover.   The upper cylinder (20) has a hook receiving step (22) on which a hook (62) of a cylinder lock is hooked on an upper portion of a cylinder chamber (21) provided therein, and a locking claw on the cylinder lock on a lower portion. A claw receiving step portion (23) for engaging the portion (63) is provided, and provided between the chamfered plates 27, 27 paired with a locking hole (24) formed in the lower portion of the claw receiving step portion. 2. The manhole cover locking device according to claim 1, wherein a head (36) of the operating shaft (35) is provided in the engagement groove (28) so as to be engageable.   The lower cylinder (30) is formed with a guide groove (32) opened at a lower end in a substantially quarter circumference, and an operating shaft (35) constituting a latching operating part (C) in the lower cylinder; A locking piece (47) attached in a direction perpendicular to the axial direction of the operating shaft, and a spring (45) is repelled between the locking piece and the operating shaft (35), and the lower end of the lower cylinder (30) 2. The manhole cover locking device according to claim 1, wherein the bearing portion (53) is fixed to the manhole cover.   The operating shaft (35) is engaged with an engaging groove (28) provided on the lower side of the upper cylinder (20) in parallel with both sides of the fitting recess (37) provided in the center of the upper surface of the head (36). A locking step portion (38) is formed, and a shaft hole (49) provided in the base portion (48) of the locking piece (47) is provided below the cylindrical portion (39) provided in the lower portion of the head portion (36). ) And a guide shaft portion (41) inserted through the hole (54) of the bearing portion (53) are arranged on the same axis, and the lower surface of the head portion (36). And the base (48) upper surface of the locking piece (47) is elastically supported by a spring (45) to urge the operating shaft (35) upward to move up and down and rotate. The manhole cover locking device according to claim 1.   The locking piece (47) is fitted to the chamfered portion (40) of the operating shaft (35) by fitting the base portion (48), and the guide shaft portion (30) of the lower cylinder (30) is rotated along with the rotation of the operating shaft (35). 32) It is formed so as to be movable inside, and when the locking piece (47) is in the locked position, the engaging groove (28) provided in the locking hole (24) of the upper cylinder (20) has a head of the operating shaft. 2. The locking device for a manhole cover according to claim 1, wherein the locking portion is engaged with the portion (36) and urged upward by the spring (45).   The opening / closing handle (56) is provided with a fitting convex portion (58) fitted to a fitting concave portion (37) provided in a head portion (36) of the operating shaft at a lower end of the operation shaft (57). The manhole cover locking device according to claim 1, wherein a drainage port (43) for allowing the drainage to flow down is provided in the guide shaft part (41) continuously to the concavity. The cap lid (65) is made of a hard rubber material, and the latch receiving portion (66) provided on the inner peripheral surface and the latch protrusion (26) provided on the outer peripheral surface of the upper cylinder (20) can be attached and detached. The locking device for a manhole cover according to claim 1, wherein the locking projection (67) is provided in the center of the upper surface.

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