JP2008180049A - Locking device and lid body unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device which can prevent the inflow of rainwater by making a small lid body provided surely along the inner peripheral surface of a tool inserting opening, and a lid body unit. <P>SOLUTION: The locking device comprises a small lid body for closing the tool inserting opening formed at the lid body, and a hook which is locked to a piece-to-be-locked provided in at least a portion corresponding to the tool inserting opening of a supporting frame piece to be locked from below. The hook can freely be switched between a locking attitude in which its locking portion is positioned below the piece to be locked, and an unlocking attitude in which the hook is avoided from below the piece to be locked. A switching means for switching the attitude of the hook is provided. The switching means comprises: a supporting extended portion which is extended downward from the backside of the lid boy in a portion corresponding to the side of the tool inserting opening on the backside of the lid body; a guiding recess which is formed at the supporting extended portion which supports a hook body in such a manner that the hook body can be freely rotated on the axis line of a supporting shaft body via the horizontal supporting shaft body, and guides the supporting shaft body between the locking and unlocking attitudes in such a manner that the supporting shaft body freely gets close to/is freely isolated from the opening wall surface side of the supporting frame; and a spring body for urging the hook into the locking attitude. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a locking device and a lid device for lids such as a lid for a common wire groove and a lid for a manhole.

  Conventionally, a locking device that locks the lid by locking it to the receiving frame side so that the lid that closes the opening of the equipment such as the lid for the common wire groove and the lid for the manhole is not opened unexpectedly. For example, what is shown to patent document 1 is proposed.

  This forms support extending portions respectively extending downward from the back surface of the lid body at portions corresponding to both side portions of the tool insertion opening formed on the outer peripheral portion of the lid body. A heel body having a small lid for closing the tool insertion opening and supported by the extended portion via a support shaft is provided, and the heel body is supported in the direction of closing the small lid. A spring body that biases the shaft portion is provided.

Further, due to the biasing force of the spring body, the upper surface of one end portion of the small lid body comes into contact with the back surface of the lid body, and the other end portion of the small lid body is slidably contacted (engaged) with the inner peripheral surface of the receiving frame. The length of the small lid is set so that the posture in which the tool insertion opening is closed by the small lid is maintained.
JP 2003-20670 A

  In the above conventional locking device, the heel main body is supported via the support shaft portion on the supporting extension portion that extends downward on the back surface of the lid body, and the other end portion of the small lid body is attached to the receiving frame. It is configured to set so as to be in sliding contact with the inner peripheral surface. That is, the small lid is rotated around a support shaft that can only rotate and does not move in any direction, and the other end of the small lid is slidably contacted with the inner peripheral surface of the receiving frame. Therefore, it is necessary to accurately relate the length of the small lid, the position of the support shaft portion, and the like.

Therefore, if these relationships are not manufactured so as to be accurately set, the other end of the small lid does not slide in a predetermined position on the inner peripheral surface of the receiving frame, and in this case, the inside of the tool insertion opening There is a problem that a gap is generated between the peripheral surface and the small lid (the small lid does not follow the inner peripheral surface of the tool insertion opening), and rainwater flows in from the gap.
However, it is difficult to manufacture such that the other end of the small lid is slidably contacted at a predetermined position on the inner peripheral surface of the receiving frame.

  In view of the above problems, an object of the present invention is to provide a locking device and a lid device that can prevent the inflow of rainwater by reliably placing the small lid along the inner peripheral surface of the tool insertion opening.

  The present invention is a locking device for a lid that closes the opening of a receiving frame portion that is provided so as to form an opening, and has a small lid that closes a tool insertion opening formed in the lid, and at least of the receiving frame portion And a hook for locking from below to a locked piece provided at a portion corresponding to the tool insertion opening, and the hook has a locking posture in which the locking portion is positioned below the locked piece and the hook. Can be switched to an unlocking position to avoid from below the locked piece, and switching means for switching the hook position is provided, and the switching means is provided on the back side of the lid on the side of the tool insertion opening. A support extending portion that extends downward from the back surface of the lid body at a portion corresponding to the portion, and a support shaft body that is formed on the support extending portion and that has a laterally (horizontal) shaft body. Through the support shaft so as to be pivotable around the axis of the support shaft and locking posture It is characterized by comprising a guide recess for guiding the supporting shaft body toward and away from the opening wall surface of the receiving frame portion between the unlocking posture and a spring body for biasing the hook to the locking posture. .

  In the above configuration, when the lid closes the opening, the hook locking portion is in the locking posture below the locked piece. Therefore, even if the lid is opened in this state, the hook locking portion The lid cannot be opened by being locked to the locked piece from below.

  When opening the lid, it is necessary to change the hook from the locked position to the unlocked position. In this case, when the small lid is pressed downward with a tool against the elastic force of the spring body, the hook rotates around the spindle body and the hook is separated from the opening wall surface side together with the spindle body. Thus, the lid can be opened by lifting the lid when the hook is released from below the latched piece. In a state where the lid is removed from the receiving frame portion, the hook is not under the locked piece, and its posture is not different from the locking posture.

  When closing the lid, if the lid is aligned with the opening and pressed downward, the hook slides against the opening wall surface of the receiving frame portion from the inside and further presses the lid against the elastic force of the spring body. The hook receives a pressing force from the opening wall surface of the receiving frame portion and starts to rotate around the shaft body, and the shaft body is guided by the guide recess and moves away from the opening wall surface side together with the hook. When the movement of the support shaft is absorbed and the hook locking portion moves downward along the opening wall surface without locking to the opening wall surface, and moves downward, and moves downward from the opening wall surface, By rotating around the support shaft body by the elastic force, the locking position of the hook is located below the locked piece.

  In addition, when the opening is closed with the lid and the hook is in the locking posture, the small lid is pressed together with the support shaft and the hook to the opening wall surface side by the elasticity of the spring body, so the outer surface of the small lid opens. It is possible to reliably contact the wall surface without a gap, and therefore rainwater can be prevented from flowing in between the small lid and the opening wall surface.

  In the lid locking device of the present invention, a moving member is provided that has one end connected to the hook and the other end supported on the back side of the lid and moves in accordance with the change in the attitude of the hook, and the guide direction of the guide recess And an angle change means for changing the angle at which the axis of the moving member intersects with the change in the posture of the hook.

  In the above configuration, the angle at which the guide direction of the guide recess intersects with the axis of the moving member is changed by the angle changing means in accordance with the change in the posture of the hook in the vertical plane, so that the hook moves around the support shaft body. It rotates smoothly and the hook switches between the unlocking position and the locking position.

  In the locking device for a lid according to the present invention, the moving member is formed in a bowl shape, and the angle changing means is provided in the supporting extension portion, and the one end side of the moving member is rotated around the horizontal (horizontal) axis. And a hinge part that is rotatably supported, and a movement allowance part that extends downward on the back surface of the lid body and permits movement thereof on the other end side of the moving member.

  In the above configuration, when the lid is opened and closed, the other end side of the moving member moves while being supported by the movement allowing portion in association with an operation in which the hook is supported by the hinge portion and rotates around the axis.

The lid locking device of the present invention is characterized in that a buffer means for buffering an impact applied to the hook is provided.
According to the above configuration, when the lid is lifted by air pressure or water pressure and the hook is locked to the locked piece with an impact force from below, the shock force is alleviated by the buffer means, so that the hook is damaged. Is prevented.

  In the lid locking device of the present invention, the hook has an attachment shaft body, and the hook is inserted through the attachment shaft body and provided separately from the attachment shaft body. It is characterized by having a buffering spring body provided between the hook and the hook.

  In the above configuration, when the lid is lifted by air pressure or water pressure and the hook is locked to the locked piece from below with an impact force, the impact force is alleviated by the elastic force of the buffer spring body of the buffer means. Therefore, damage to the hook is prevented.

  In the lid locking device of the present invention, the attachment shaft body is a bolt body that extends downward from the support shaft body and has an external thread portion formed on the outer peripheral surface, and the external thread portion of the bolt body is exposed to the hook and downward. The buffer spring body is sandwiched between the bottom surfaces with the bottom surface of the recess and the bottom surface of the nut body screwed into the male screw portion as spring seats. Yes.

  According to the above configuration, since the buffer spring body is housed in the recess formed in the hook and the bottom surface of the recess and the bottom surface of the nut body serve as spring seats, the buffer spring body does not protrude outside the hook. .

  The lid device of the present invention is characterized by including any one of the locking devices described above.

  The lid body device of the present invention is a lid body device comprising any one of the above-described locking devices and a hinge provided on the lid body on the opposite side of the locking device, in the vicinity of a predetermined edge of the lid body. A connecting portion that rotatably connects the upper end of the hinge is provided, and a protruding portion is provided corresponding to the connecting portion toward the inner diameter side of the opening of the receiving frame portion, and an insertion hole in the vertical direction is formed in the protruding portion. The inner side surface of the insertion hole is formed in an inclined surface that is formed to expand upward, and a locking piece that can be locked from below by a locking piece formed on a hinge is formed on the protrusion. The hinge has a hanging portion that extends downwardly, and the hanging portion is curved in an arc shape so as to protrude outward from the opening opposite to the protruding direction of the protruding portion, When the lid is changed from the open state to the closed state, the curved inner edge of the hanging part slides on the inner peripheral surface of the insertion hole of the protrusion It is characterized by being earthenware pots configuration.

  In the above configuration, when the lid body is moved in the closed state, the latching piece comes into contact with the latched portion from below and is latched to prevent the lid body from moving further upward. When the hinge is rotated around the connecting portion and the lid is moved upward in a state where the locking piece avoids the locked portion, the hinge moves up the insertion hole of the protruding portion and opens the lid. It becomes possible to be in a state.

  When the lid is moved downward from the open state, the inner edge of the hanging part of the hinge slides on the inner peripheral surface of the insertion hole of the protrusion, and this causes a positional deviation between the lid and the opening. The lid body moves downward while the misalignment is corrected.

  According to the locking device of the present invention, since the small lid body is pressed toward the opening wall surface side together with the support shaft body and the hook by the elasticity of the spring body, the outer surface of the small lid body reliably contacts the opening wall surface without any gap. It is possible to prevent the inflow of rainwater by reliably placing the small lid along the inner peripheral surface of the tool insertion opening.

  Hereinafter, a lid locking device according to an embodiment of the present invention will be described with reference to the drawings, taking a locking device for a manhole lid as an example. FIG. 1 is a side sectional view showing the overall configuration of a lid and its locking device according to an embodiment of the present invention, FIG. 2 is a plan sectional view centered on a first locking part and a second locking part, and FIG. FIG. 4 is a side sectional view showing the locking postures of both locking parts drawn around the first locking part and the second locking part, and FIG. 5 is a figure showing the locking with the lid lifted up. FIG. 6 and FIG. 7 are side sectional views showing a state in which a tool is inserted.

  As shown in these drawings, the lid 1 closes the circular opening 3 of the receiving frame member 4 provided to form the circular opening 3 by using the side wall 2 of the manhole so as to be freely opened and closed. Therefore, in this embodiment, the lid body 1 is formed in a circular shape in plan view. In addition, the receiving frame member 4 and the cover body 1 are each formed from ductile cast iron. Further, ribs 5 necessary for a predetermined strength are provided on the back surface of the lid 1 so as to extend downward, so that the lid 1 is integrally formed in a vertical and horizontal lattice shape.

  The receiving frame member 4 is integrally formed from an annular base portion 6 and a lid body mounting portion 8 having an annular wall portion 7 formed so as to extend upward from the inner diameter side portion of the base portion 6. Is formed. In the middle of the wall body portion 7 in the vertical direction, a first locked piece 11 to be locked from below by a first hook 10 described later is formed. The first locked piece 11 is formed only in a predetermined position of the wall body portion 7, that is, in a region corresponding to the first hook 10. The first locked piece 11 protrudes radially inward from a part of the wall body portion 7 and extends radially inward in the radial direction with respect to the wall body portion 7. It is formed in a bowl shape that protrudes downward at one side.

  The upper part of the inner peripheral surface 12 of the lid mounting part 8 is formed in a conical surface (tapered surface) having a smaller diameter downward, and the outer peripheral surface 1 a of the lid 1 is the upper part of the lid mounting part 8. It is formed in a conical surface corresponding to the inner peripheral surface 12 (can be fitted to the inner peripheral surface 12).

A part of the outer periphery of one end in the radial direction of the lid body 1 is cut out inward in the radial direction to form a tool insertion opening 13 having a substantially semi-elliptical shape in plan view. The operating part 15 of the tool 14 for opening the lid (see FIGS. 6 and 7) can be inserted, and the first hook 10 of the locking device 16 (in this case, the first locking part 20 described later) is set to the unlocking posture C. If possible, the tool insertion opening 13 is not limited to a semi-elliptical shape. The inclination of the inclined surface is steeper than that of the inner peripheral surface 12 of the lid mounting portion 8. The small lid 18 is fitted into the tool insertion opening 13 from the back side of the lid 1, and the outer circumferential surface 18 a is fitted to the inner circumferential surface 17 of the tool insertion opening 13 so that the inner circumference can be fitted. It is formed in a taper surface formed in an inclination opposite to the surface 17. Moreover, the surface is formed in the plane.
The inner peripheral surface 17 of the tool insertion opening 13 is an inclined surface that spreads outward as it goes downward.

  The locking device 16 includes a first locking part 20 and a second locking part 21. The first locking part 20 has a small lid 18 and is provided on one end side in the radial direction of the lid 1. The second locking part 21 is provided on the other end side in the radial direction of the lid 1.

The first locking part 20 has a hook main body that is locked to the first locked piece 11 from below, that is, the first hook 10. The first hook 10 is formed at an acute angle so that the first locking piece 22, which is the tip of the first hook 10, can be locked to the first locked piece 11. The first hook 10 has a base end portion 23 provided so as to be rotatable about an axis line (horizontal axis) of a first support shaft body 24 described later. The shape of the first hook 10 will be described in detail in a side view. The first hook 10 has a curved portion 25 curved downward from the acute first locking piece 22, and the base end portion 23 is curved in the locking posture A described later. The first locking piece 22, the bending portion 25, and the base end portion 23 are integrally formed so as to rise upward from the portion 25.
The small lid 18 and the first hook 10 are integrally formed, and the small lid 18 and the first hook 10 rotate integrally around the axis of the first support shaft 24. It has become.

The first hook 10 has a locking posture A in which the first locking piece 22 at the tip of the first hook 10 is located below the first locked piece 11, and the first hook 10 from below the first locked piece 11. It is possible to switch to an unlocking posture C (see, for example, FIG. 4) that is avoided toward the center in the radial direction. In this case, the first locking piece 22 is positioned below the first locked piece 11, and is directly below the first locked piece 11, and is separated from the first locked piece 11 by a predetermined distance H <b> 1. It is in the position.
The first locking part 20 has switching means 26 for switching the posture of the first hook 10 between the locking posture A and the unlocking posture C.

  The switching means 26 is a first portion extending downward from the back surface of the lid body 1 to a portion corresponding to the side of the tool insertion opening 13 on the back surface of the lid body 1 (in this case, both sides in the circumferential direction). A supporting extension 27, a lateral first support shaft 24 formed integrally with the base end 23 of the first hook 10, and a first support for guiding the first support shaft 24 Groove-shaped guide recesses 28 and 29 formed in the extended portion 27 and a spring body 30 for biasing the first hook 10 to the locking posture A are provided.

More specifically, the first support extending portion 27 is integrally formed on the back surface of the lid body 1 and has the same shape and is substantially rectangular in a side view and long in the radial direction. The guide recesses 28 and 29 are formed on the circumferentially opposed surfaces of the first support extending portions 27, respectively, and are horizontally long grooves that are at the same height and are inclined downward inward in the radial direction. It is formed in a shape.
The radially outer starting end surfaces (in this case, arcuate surfaces) of the guide recesses 28 and 29 are arranged at positions substantially directly below the radially inner end of the tool insertion opening 13.

  For the assembly of the first hook 10, the radially inner end of one guide recess 28 is different from the end of the other guide recess 29, and the radially inner end of one guide recess 28 is The end is extended to the radially inner end of the first support extension 27. The end of the other guide recess 29 does not reach the radially inner end of the first support extension 27, but extends partway in the longitudinal direction of the first support extension 27.

  That is, after the first hook 10 is inclined with respect to the radial direction in a plan view and the other first support shaft body 24 is fitted into the other guide recess 29, the first support shaft body 24 is provided. The first hook 10 is supported by the first support extending portion 27 so that the first hook 10 is inserted into one guide recess 28 from its end.

  Then, in order to assemble the first hook 10 to the first support extending portion 27, after the first support shaft body 24 is inserted into the guide recesses 28 and 29 as described above, one of the first support extending portions is provided. An assembly bolt b1 as an assembly tool is inserted into the other end in the longitudinal direction of the portion 27 along the radial direction from the side, and the head b2 of the assembly bolt b1 that is a movement blocking unit It arrange | positions in the longitudinal direction middle of the guide recessed part 28. FIG. The position of the head b <b> 2 is a position corresponding to the terminal position of the other guide recess 29.

  With this configuration, the first hook 10 can be easily assembled to the first supporting extension 27, and the first hook 10 can be guided along the guide recesses 28 and 29 without play. it can.

  The radial outer end of the guide recess 28, that is, the position of the starting end surface is a state in which the small lid 18 is accurately fitted in the tool insertion opening 13, and the first support shaft 24 has a diameter from the starting end surface. It is preferable to be spaced inward in the direction. In short, regardless of the shape of the lid body 1, the small lid body 18 is almost fitted on the upper surface of the lid body 1 between the starting end surface and the first support shaft body 24 in a state where the small lid body 18 is accurately fitted in the tool insertion opening 13. It is preferable to have a gap along the direction.

  The switching means 26 includes a moving member 33 that is connected to the hook on one end (tip portion) 31 side and supported on the back surface side of the lid body 1 on the other end 32 side, and moves as the posture of the first hook 10 changes.

  The moving member 33 is formed in a bowl shape, and one end 31 thereof is connected to the first hook 10 via a hinge portion 34 provided at a boundary portion between the curved portion 25 and the base end portion 23 of the first hook 10. ing.

  The hinge portion 34 includes an attachment piece 35 integrally extending radially inward at the boundary portion between the curved portion 25 and the base end portion 23 of the first hook 10, and further from both sides in the circumferential direction of the attachment piece 35. A pair of hinge shafts 36 projecting outward and an arm wrist portion 37 formed at one end 31 of the moving member 33 and rotatably connected to each hinge shaft 36 from the outside.

  A stopper 39 extending downward from the back surface of the lid 1 is formed continuously to the radially inner end surface of the first support extending portion 27. The stopper 39 is extended to a height position where the upper portion of the arm wrist portion 37 can come into contact. In this embodiment, the stopper 39 is formed in a trapezoidal shape when viewed from the side, and is inclined from the horizontal surface 39a as the lower surface and the horizontal surface 39a A corner portion 39c having a surface 39b and where the horizontal surface 39a and the inclined surface 39b are continuous is a portion where the upper portion of the arm wrist portion 37 can actually abut.

  In this embodiment, the first hook 10 rotates around the first support shaft 24 and the upper portion of the arm wrist portion 37 is in contact with the corner portion 39c of the stopper 39. Is set to be substantially horizontal.

  Since the attachment piece 35 is formed integrally with the first hook 10, the position of the attachment piece 35 is changed along with the posture of the first hook 10. In the locking posture A of the first hook 10, the first support extending portion 27 is provided. The first hook 10 is moved toward the radially inward surface 38 side of the first support extending portion 27 as the unlocking posture C is set.

  The switching means 26 includes the spring body 30 for biasing the first hook 10 to the locking posture A. As the spring body 30, a coil spring (compression spring) that urges the first hook 10 to rotate clockwise (for example, clockwise in FIG. 1) around the first support shaft body 24 is used. The spring body 30 is provided so as to fit around the moving member 33.

  The other end of the moving member 33 is placed at a position separated from the tool insertion opening 13 on the rear surface of the lid 1 by a predetermined distance L1 (for example, see FIG. 7) from the radially inner end surface to the radially inner end surface. A support flange 40 as a movement allowing portion that is supported so as to be movable in the radial direction in plan view on the side of the portion 32 (allows movement) is integrally formed so as to hang down from the back surface of the lid body 1. That is, the support flange 40 is formed in a plate shape, and a support hole 41 through which the other end 32 side of the moving member 33 is inserted is formed in the upper part in the middle of the vertical direction. Although the shape of the support hole 41 is not particularly limited, the other end portion of the moving member 33 is inserted into the other end 32 side of the moving member 33 to prevent the movement in the circumferential direction as will be described later. The shape is such that the 32 side is rotatably supported in the vertical direction.

  For example, if the cross-sectional shape of the moving member 33 is circular as in this embodiment, the upper and lower inner peripheral surfaces (at least the lower inner peripheral surface) of the support hole 41 are formed to be approximately equal to the outer peripheral curvature of the moving member 33. It is preferable to use a long hole in the direction.

  In short, by making it a long hole that is long in the vertical direction, the other end 32 side of the moving member 33 is inserted and supported in a vertical plane without being provided with a support shaft, and moved along the radial direction. The angle θ at which the axial direction 33a of the moving member 33 and the guide direction 28a of the guide recess 28 intersect can be changed.

  The spring body 30 includes an annular flange 42 integrally formed at the radial end portion 31 side end of the arm wrist portion 37 and an annular flange member 43 slidably fitted in the middle of the moving member 33. Is used as a spring seat member, and is sandwiched between the collar portion 42 and the collar member 43 so as to be stretchable. Due to the elasticity of the spring body 30 in the extending direction, the first hook 10 is pressed clockwise through the hinge portion 34, and the locking posture A is maintained. Reference numeral 32 a is a retaining ring that is externally fitted and fixed to the other end portion 32 of the moving member 33.

  Further, in the locking posture A of the first hook 10, the upper portion of the flange portion 42 abuts on the radially inner surface 38 of the first support extending portion 27, and the diameter of the inner peripheral surface 17 of the tool insertion opening 13. The tapered surface which is the other end side surface 45 of the small lid 18 is in contact with the tapered surface which is the inner side surface 44 in the direction, and the small lid 18 maintains a horizontal posture. In other words, the small lid 18 is fitted to the inner peripheral surface 17 of the tool insertion opening 13 from below.

Next, the structure of the 2nd locking part 21 provided in the other side of the cover body 1 is demonstrated.
8 is a side sectional view showing the locking posture B of the second locking part 21, FIG. 9 is a side sectional view of the state in which the lid body 1 is moved upward in the locking posture B, and FIG. FIG. 11 is a side sectional view showing an example of the movement of the second hook that moves with the movement of rotating the lid 1, and FIG. It is the rear view from the radial direction outer side which mainly drew the 2nd hook.

As shown in these drawings, the second locking portion 21 is a connection formed integrally with the other side of the lid 1 so as to extend downward on the back surface opposite to the first locking portion 20. A second supporting extension portion 50 serving as a portion, and a second hinge serving as a hinge supported by the second supporting extension portion 50 via a second support shaft 51 in the lateral direction so as to be rotatable in a vertical plane. A hook 52 and a locked body 55 as a projecting portion having a second locked piece 54 that a second locking piece 53 formed integrally with the second hook 52 contacts and locks from below. Have.
In addition, the lower surface of the 2nd to-be-latched piece 54 becomes a horizontal latching surface which the 2nd latching piece 53 contact | abuts from below and latches.

As shown in these drawings, the second hook 52 has a diameter from the second spindle 51 in a side view in the locking posture B in which the second locking piece 53 can be locked to the second locked piece 54. Arm portion 56 extending inward in the direction, and hanging portion 57 extending downward from the radially inner side of arm portion 56, and hanging portion 57 outwards in the closed state. The upper inclined portion 57A is inclined downward and the lower inclined portion 58 is integrally formed at the lower end of the upper inclined portion 57A and is inclined obliquely inward in the radial direction.
In other words, the drooping portion 57 as a whole has an arcuate shape so as to protrude in the opposite direction (outside which is the inner side of the circular opening 3) to the protruding direction (center side which is the inner side of the circular opening 3). It is formed in a curved shape. The inner edge 57 a of the hanging part 57 is also a curved surface so as to protrude in the direction opposite to the protruding direction of the locked body 55, as with the entire hanging part 57.

  The second locking piece 53 extends so as to protrude outward in the radial direction at the boundary portion between the hanging portion 57 and the lower inclined portion 58. The second support shaft body 51 is integrally formed with the arm portion 56.

  A convex portion 59 that protrudes further inward is integrally formed on the inner side surface of the upper inclined portion 57A. The convex portion 59 is disposed at the center of the drooping portion 57 in the width direction, and the thickness thereof is equal to that of the drooping portion 57. The convex portion 59 is formed in a substantially triangular shape as a whole with a substantially arcuate portion 59a having an arcuate tip shape whose innermost vertical position protrudes inward. The lower inner edge of the arc portion 59a is formed on an arc surface 59b that protrudes outward.

  A bulging portion 69 that bulges upward so as to protrude upward is integrally formed on the upper surface of the arm portion 56. The bulging portion 69 is disposed at the center of the arm portion 56 in the width direction, and the thickness thereof is equal to that of the arm portion 56. The bulging portion 69 is formed in a substantially triangular shape as a whole, and is provided so that the upper surface thereof is in contact with the back surface of the lid body 1 in the closed state, and the side surface is continuous with the convex portion 59 from above. ing.

  Assembling the second hook 52 to the second support extension 50 is performed on the L-shaped attachment groove 49 formed on the second support extension 50 on both sides of the arm portion 56 of the second hook 52. The formed second support shaft body 51 is guided and attached, and a positioning bolt b3 as a positioning tool is inserted and fixed from the side of one of the second supporting extension portions 50, and the tip portion thereof is attached to the attachment groove 49. To expose. Thereby, the 2nd hook 52 can be easily and reliably assembled | attached to the extension part 50 for 2nd support.

  The locked body 55 is formed in a B shape in plan view by extending radially inward on the inner peripheral surface 17 of the lid mounting portion 8. An insertion hole 60 into which the lower inclined portion 58 of the second hook 52 is inserted downward is formed at the center of the second hook 52 in a plan view. Can contact the back surface (lower surface) of the second locked piece 54 from below the insertion hole 60.

  Of the inner peripheral surface of the insertion hole 60, the inner side surface portion 60 a is an arcuate inclined surface that is enlarged upward. The curvature of the inner side surface portion 60a is set substantially equal to the curvature of the circular arc surface 59b.

  A retaining piece 79 is integrally formed on both sides of the lower portion of the lower inclined portion 58. These retaining pieces 79 are provided to prevent the second hook 52 from being pulled upward from the insertion hole 60. The retaining pieces 79 have an axis parallel to the second support shaft body 51, and are removed. The distance between both end faces of the stopper piece 79 is set larger than the diameter of the insertion hole 60.

  In the locking posture B of the second hook 52, the second locking piece 53 is located immediately below the second locked piece 54, and is spaced downward from the second locked piece 54 by a predetermined distance H2. is there. Further, the locking posture B of the second hook 52 is configured to be held by its own weight. That is, the second hook 52 is urged by its own weight to rotate counterclockwise around the second support shaft 51 in, for example, FIG. 1, FIG. 11, FIG. The locking posture B is maintained by abutting 57 on the inner peripheral surface of the insertion hole 60.

  In the locking device 16 of the lid body 1 configured as described above, in the closed state in which the lid body 1 closes the circular opening 3, as described above, the first hook 10 and the second hook 52 have the locking postures A and B, respectively. In the first locking part 20, the outer peripheral surface of the small lid 18 is spaced from the lower side to the inner peripheral surface 17 of the tool insertion opening 13 and the upper part of the inner peripheral surface 12 of the circular opening 3 of the receiving frame member 4. It is in a state of being fitted.

  This is because in the first locking portion 20, the small lid 18 and the first hook 10, together with the first hook 10, are rotated clockwise around the first support shaft 24 by the spring body 30 having an elastic urging force toward the outer side in the radial direction. In other words, the small lid 18 is centered on its radially inner end, and its radially outer end is mounted on the lid around the radially inner end. This is because it is raised along the inner peripheral surface of the mounting portion 8 (in this case, the upper portion of the inner peripheral surface 12).

  In other words, the small lid 18 is not subjected to the elastic force only from the direction along the tapered surface that is the inner peripheral surface of the lid mounting portion 8 but by the elastic force of the spring body 30 arranged in the radial direction (diagonally downward). When the pressing force in the rotation direction is received around the first support shaft body 24 and the small lid body 18 is fitted to the inner peripheral surface 17 of the tool insertion opening 13, the first support shaft body 24 is guided by the guide recess. 28 is configured to be guided outward in the radial direction (a configuration in which the first support shaft body 24 is not fixed), the small lid 18 has a radially inward end at the tool insertion opening. The inner peripheral surface of the tool insertion opening 13 along the inner peripheral surface of the lid mounting portion 8 so as to rotate while being in contact with and locked to the radially inner end portion of the inner peripheral surface 17 of 13. 17 is fitted with no gap.

Therefore, since there is no gap between the tool insertion opening 13 and the small lid 18, inflow of rainwater from the tool insertion opening 13 can be prevented as much as possible.
In the locking posture A of the first hook 10, the dimension θ, the position, etc. of the members are such that the angle θ (θ1) at which the axial direction 33 a of the moving member 33 intersects the guide direction 28 a of the guide recess 28 forms an obtuse angle. Is set.

  In addition, the radial outer end of the guide recess 28, that is, the position of the start end surface is such that the small lid 18 is accurately fitted in the tool insertion opening 13, and the first support shaft 24 is positioned at the start end surface. As described above, it is preferable to be spaced radially inward from the above, and thus the small lid 18 is accurately fitted into the tool insertion opening 13 regardless of the shape of the lid 1. Thus, the outer peripheral surface of the small lid 18 is set to the inside of the tool insertion opening 13 by setting so as to have a gap in the direction substantially along the upper surface of the lid 1 between the start end surface and the first support shaft 24. Since the small lid 18 has a margin for moving outward from the lid 1 when fitted to the circumferential surface 17, the outer circumferential surface of the small lid 18 until the small lid 18 becomes horizontal. Is locked to the inner peripheral surface 17 of the tool insertion opening 13, and a gap is created between them. It can be more reliably prevented.

  In the locking posture A of the first hook 10 as described above, since the first locking piece 22 of the first hook 10 is directly below the first locked piece 11, Although it is lifted by a predetermined distance H1 until the first locking piece 22 is locked to the locked piece 11, it cannot be lifted any further.

  Further, in the second locking portion 21, the second hook 52 holds a state in which the second hook 52 is rotated counterclockwise around the second spindle 51 by its own weight, and the second locking piece 53 is held in the second locked portion 53. Since it is in the locking posture B immediately below the locking piece 54, when the lid 1 is lifted, the second locking piece 53 that is lifted by a predetermined distance H2 is locked to the second locked piece 54 from below. And I ca n’t lift any more. For this reason, it is possible to prevent the lid 1 from being opened unexpectedly.

  On the contrary, the lid 1 is engaged until the first locking piece 22 of the first hook 10 is locked to the first locked piece 11 and the second locking piece 53 is locked to the second locked piece 54. Can float with respect to the receiving frame member 4. For this reason, when the air pressure or water pressure that causes the lid 1 to rise acts on the lid 1 from the inside of the manhole, the lid 1 rises and is compressed from the gap between the lid 1 and the receiving frame member 4. Air and rainwater can escape outside the manhole. For this reason, it becomes possible to avoid destruction of a locking device etc.

  Next, the operation when opening the lid 1 will be described. In order to set the first hook 10 in the locking posture A for opening the lid 1 to the unlocking posture C, as shown in FIG. The surface of the body 18 is pressed against the elasticity of the spring body 30 obliquely from above (for example, from a direction along the inclination of the radially inner circumferential surface 17 of the tool insertion opening 13).

  When the small lid 18 is pressed in this way, the first support shaft 24 is guided by the guide recess 28 by the pressing force and retracted along the guide direction 28a, and the first hook 10 is Accordingly, the other end side surface 45 of the small lid 18 is released from the contact with the back surface of the lid body 1 and is separated from the back surface of the lid body 1. The spring body 30 sandwiched between the spring seats shrinks along the axial direction of the moving member 33, and the angle θ between the axial direction 33a of the moving member 33 and the guide direction 28a of the guide recess 28 is large within 180 °. The moving member 33 moves backward while being changed to be θ2.

  Then, even if the first locking piece 22 of the first hook 10 is retracted from the position directly below the first locked piece 11 (moves inward in the radial direction) and the lid body 1 is lifted, the first hook 10 The first locking piece 22 is in the unlocked posture C where it is not locked to the first locked piece 11.

  Then, as shown in FIG. 7, the tool 14 is rotated so that both side ends of the operation unit 15 come into contact with the back surface of the lid 1 so that the operation unit 15 is hooked on the lid 1 and lifted. By doing so, the lid 1 starts to rotate in the vertical plane around the second spindle 51 of the second locking part 21, and the lid 1 is further centered on the second spindle 51. If the rotation is continued, a part of the lid body 1 on the other end side in the radial direction enters the circular opening 3 of the receiving frame member 4. In this case, since the opening is circular, the other end side in the radial direction of the lid body 1 is displaced from the other end in the radial direction of the receiving frame member 4 to one side in the radial direction to form the circular opening 3 of the receiving frame member 4. Since the second hook 52 (second support shaft body 51) moves to the one side in the radial direction by the amount of entering and displaced, the second locking piece 53 is directly below the second locked piece 54. From the locking posture B, the unlocking posture D is moved inward in the radial direction while avoiding the position immediately below the locking posture B.

  Therefore, when the lid body 1 is further rotated so that the other end surface in the radial direction of the lid body 1 is brought into contact with the upper surface portion of the lid body mounting portion 8, the second hook 52 is in the unlocking posture D, As the support shaft 51 moves upward, the second hook 52 moves upward through the insertion hole 60 of the locked body 55, and the lid body 1 is removed from the receiving frame member 4 to open the circular opening 3. The lid can be opened. Thus, after the lid 1 is in the open state, the operator can enter the manhole and work.

In the first locking portion 20, when the lid body 1 is lifted from the circular opening 3 and the first hook 10 is detached from the receiving frame member 4, the first hook 10 has the first locking piece 22 of the first locking piece 22. The small lid 18 is held so as to be substantially flush with the surface of the lid 1 just under the locking piece 11. In the posture in which the small lid 18 is substantially flush with the surface of the lid 1, the elastic force of the spring body 30 is acting on the small lid 18, and the radial direction of the inner peripheral surface 17 of the tool insertion opening 13. This is because the tapered surface which is the other end side surface 45 of the small lid 18 abuts against the tapered surface which is the inner side surface 44.
Further, the first support shaft body 24 is in contact with the radially outer starting end surfaces of the guide recesses 28 and 29 due to the elasticity of the spring body 30.

  FIG. 11 shows a case where the lid 1 is opened by another procedure. That is, FIG. 11 shows a case where the lid 1 is in the open state shown by turning around the vertical axis.

  In this case, the lid 1 is opened on the first locking portion 20 side with the first locking portion 20 side as the unlocking posture C as described above, and the lid 1 is pulled into the first locking portion 20 side. . In this way, in the second locking portion 21, the second locking piece 53 is moved from the locking posture B immediately below the second locked piece 54 to the unlocking posture D moved inward in the radial direction while avoiding the direct lowering. When the lid body 1 is further pulled in the same direction, the second hook 52 (hanging portion 57) is caused by its own weight so that the inner edge 57a thereof is connected to the inner side surface portion 60a of the inner peripheral surface of the insertion hole 60 of the locked body 55. The second locking piece 53 is pulled out from the insertion hole 60 by being pulled obliquely upward while making contact.

  In this state, the lid body 1 is in a state of being displaced in the radial direction with respect to the circular opening 3 in plan view, and then the lid body 1 is turned around the vertical axis around the lower portion of the second hook 52. . At this time, even if the second hook 52 further moves in the direction of being pulled out from the insertion hole 60, the retaining piece 79 abuts (latches) the lower portion of the body 55 to be locked. Thus, a state in which the second hook 52 is completely extracted from the insertion hole 60 can be avoided.

  Then, after the lid body 1 is swung around the vertical axis around the lower portion of the second hook 52, the lid body 1 is placed on the road surface or the like so that the lid body 1 is opened. By doing so, the worker can enter the manhole and work.

In FIGS. 10 and 11, the lid 1 is in the open state with the second hook 52 locked to the receiving frame member 4 (the locked body 55) without completely removing the lid 1 from the receiving frame member 4. It is also possible to completely release the second hook 52 from the receiving frame member 4 so as to open the lid.
In this case, it is possible by turning the lid 1 as shown in FIG. 11 and pulling out the retaining piece 79 from the insertion hole 60.

  Here, a case where the lid 1 is closed again from the opened state will be described. FIG. 13 is a side sectional view centering on the first locking part before closing the lid 1, and FIG. 14 is a side sectional view showing a state in which the first hook of the first locking part slides on the receiving frame member and rotates. FIG. 15 is a side view showing a state where the first hook is again in the locking posture.

  Here, a case will be described in which the lid 1 is closed again from the opened state. In the case where the retaining piece 79 is pulled out from the insertion hole 60 and is opened again, the second hook 52 is aligned with the insertion hole 60 of the locked body 55 and inserted. The entire body 1 is substantially aligned with the circular opening 3, and the lid 1 is pressed downward. Then, on the first locking part 20 side, the first locking piece 22 of the first hook 10 comes into contact with the upper inner peripheral surface 12 of the lid placing part 8 so as to slide from above.

  When the lid 1 is further pressed and moved downward, the curved surface 52b extending from the hanging portion 57 of the second hook 52 to the second locking piece 53 of the second locking portion 21 is On the other hand, the inner edge 57a of the drooping portion 57 is slid in contact with the inner side surface portion 60a of the inner peripheral surface of the insertion hole 60 of the locked body 55 by being pressed by the upper surface. When the center of the lid 1 is not coincident with the center of the circular opening 3, the lid 1 is moved downward while the position of the lid 1 is corrected so that the center of the lid 1 and the center of the circular opening 3 coincide.

  In the first locking part 20, the first locking piece 22 of the first hook 10 abuts on the upper inner peripheral surface 12 of the lid mounting part 8 so as to slide from above, and the lid 1 is spring-actuated. The first hook 10 resists the elasticity of the spring body 30 by pressing further downward against the elasticity of 30 (or moving downward by the weight of the lid 1). The first support shaft body 24 is guided along the guide recesses 28 and 29, and the first hook 10 is rotated around the first support shaft body 24 and rotated in the counterclockwise direction. The moving member 33 moves while changing the angle θ at which the axial direction 33a intersects the guide direction 28a of the guide recess 28 by an amount corresponding to the distance guided along the guide line 28.

  When the lid body 1 is further moved downward and the first locking piece 22 is disengaged from the first locked piece 11, the elasticity of the spring body 30 is released and the spring body 30 expands, and the elasticity causes the first hook 10 is pressed to rotate clockwise around the first support shaft 24, and the first support shaft 24 is pressed and moved to the start end face side of the guide recesses 28 and 29, so that the first hook 10 One locking piece 22 is in a locking posture A at a position separated from the first locked piece 11 by a predetermined distance H1.

  In this case, as described above, in the first locking part 20, the outer peripheral surface of the small lid 18 is below the inner peripheral surface 17 of the tool insertion opening 13 and the upper inner peripheral surface 12 of the circular opening 3 of the receiving frame member 4. Thus, it is possible to prevent the inflow of rainwater as much as possible.

  As shown in FIG. 10, in order to put the lid body 1 in the open state by rotating around the horizontal axis around the second hook 52 into the closed state, it is the reverse of the operation for opening the lid. It will begin to work. According to this, when the second hook 52 is in contact with and slides on the inner peripheral surface of the insertion hole 60 of the locked body 55 and the center of the lid body 1 does not coincide with the center of the circular opening 3. The lid 1 is closed while the position of the lid 1 is corrected so that the center of the lid 1 and the center of the circular opening 3 coincide with each other. That is, the second hook 52 rotates clockwise around the second spindle 51, and the second hook 52 further moves downward so that the second locking piece 53 moves downward from the second locked piece 54. The second hook 52 rotates counterclockwise around the second spindle 51, and the second locking piece 53 returns to the locking posture B located immediately below the second locked piece 54. .

  Further, in the case of changing from the open state shown in FIG. 11 to the closed state again, an operation reverse to the above is performed. That is, the lid body 1 is turned around the vertical axis so that the lid body 1 is radially displaced from the circular opening 3 of the receiving frame member 4 and the lid body 1 is moved in the radial direction. Then, when the second hook 52 is guided by sliding against the inner peripheral surface of the insertion hole 60 of the locked body 55 and the center of the lid 1 does not coincide with the center of the circular opening 3, the lid The lid 1 is closed while the position of the lid 1 is corrected so that the center of the body 1 coincides with the center of the circular opening 3.

  In the first locking part 20, the first locking piece 22 of the first hook 10 abuts on the upper inner peripheral surface 12 of the lid mounting part 8 so as to slide from above, similarly to the above. By pressing the body 1 further downward against the elasticity of the spring body 30 (or by moving downward due to the weight of the lid body 1), the first hook 10 resists the elasticity of the spring body 30. The first support shaft 24 is rotated along the guide recesses 28 and 29 while the first hook 10 is rotated about the first support shaft 24. The moving member 33 moves by changing the angle θ at which the axial direction 33a intersects the guide direction 28a of the guide recess 28 by an amount corresponding to the distance guided along the guide recesses 28 and 29.

  When the lid body 1 is further moved downward and the first locking piece 22 is disengaged from the first locked piece 11, the elasticity of the spring body 30 is released and the spring body 30 expands, and the elasticity causes the first hook 10 is pressed to rotate clockwise around the first support shaft 24, and the first support shaft 24 is pressed and moved to the start end face side of the guide recesses 28 and 29, so that the first hook 10 One locking piece 22 is in a locking posture A at a position separated from the first locked piece 11 by a predetermined distance H1.

16 is a side view showing the lying posture and the standing posture of the ladder frame, FIG. 17 is a rear view, and FIG. 18 is a plan view showing the movement of the ladder frame.
As shown in these drawings, in the embodiment of the present invention, in order to prevent danger, an operator or the like is prevented from falling in a manhole in a state where the lid 1 is opened or the circular opening 3 is opened. A fall prevention device 70 is provided. The fall prevention device 70 also serves as a ladder device for an operator to enter a manhole as an underground structure when the lid 1 is opened.

  That is, the fall prevention device 70 is used in the manhole receiving frame member 4, and the base end structure portion 72 (corresponding to the base end portion) is supported on the support portion 71 provided on the frame receiving member 4. A ladder frame 73 that can be raised and lowered with respect to the circular opening 3 of the receiving frame member 4 is provided at the center.

  The ladder frame 73 is composed of a combination of metal plate-like members. Specifically, the ladder frame 73 is configured to be switchable between a prone posture X, that is, a state of being prone to a plane parallel to the circular opening 3, and a standing posture Y standing substantially perpendicular to the circular opening 3. Yes. And the prone posture holding means 94 and the standing posture holding means 99 which hold | maintain the ladder frame 73 in the prone posture X and the standing posture Y, respectively are provided.

In the prone posture X, the ladder frame 73 is passed so as to connect the side plates 74 whose thickness surfaces 74a are parallel to each other corresponding to the upper and lower sides and the side plates 74 at the tip portions of the side plates 74. And a leading end plate 75. Both side plates 74 are formed in the same cross section of a rectangular shape flat in the longitudinal direction. The tip plate 75 is formed in the same cross-sectional shape in the longitudinal direction, and in this case, L-shaped steel is used for the cross-sectional shape.
A lift assisting saddle member 76 as a lift assisting body is fixed so as to pass to both side plates 74 at predetermined intervals from the distal end plate 75 toward the base end structure portion 72. These lifting and lowering assisting members 76 pass through the side plate 74 at both side ends, and the nut member n1 is screwed from the side to the male screw formed in the penetrating portion. It is securely fixed to the plate 74.

  Here, the configuration of the base end structure portion 72 will be described. The base end structure portion 72 has a rotation center body 77 fixed to a base end portion facing surface of each side plate 74 by a fixing means such as a bolt. The rotation center body 77 is a plate-like fixing portion 78 fixed to each side plate 74, and is rearward from the fixing portion 78 above the base end portion of the side plate 74 in a side view in the prone posture X. An insertion moving part 81 extended toward the other side and slidably movable in a first concave part 80 described later, and a hook part 82 bent downward substantially perpendicularly from the insertion moving part 81; have. At the lower part of the hook portion 82, a retaining piece 84 is formed to protrude further rearward for retaining the side plate 74 from the holding body 83 to be described later while maintaining the prone posture X of the side plate 74. With such a configuration, the rotation center body 77 is formed in a U-shape that is open downward when viewed from the side in the prone posture X.

  A fitting plate 86 as a supported body that is slidably fitted from above into a second recess 85 described later is integrally provided at the base end portion of the side plate 74 of the rotation center body 77. The fitting plate 86 is formed with a height lower than that of the insertion moving portion 81 and is projected onto the insertion moving portion 81 and arranged in a region corresponding to the lower portion thereof.

  Further, on the side surface in the longitudinal direction of the side plate 74, as a standing posture assisting member, a U-shaped standing posture assisting frame 87 in plan view is fixed to the front and rear end portions 87a, 87b by attachment means such as bolts. . These standing posture auxiliary frames 87 have the same height as the side plate 74, protrude from the side surface of the side plate 74 to the side by a predetermined width and are parallel to the side surface, and the predetermined plate. Before and after the positioning of the auxiliary plate 88. Of the rising plates 90, 91, at least the rear rising plate 91 is fixed to the side plate 74 so as to stand perpendicular to the side surface of the side plate 74. As will be described later, the rear surface of the upper surface of the auxiliary plate 88 is used as a contact surface that comes into contact with a part of the inner peripheral surface 12 of the circular opening 3 of the receiving frame member 4 from the radially inner side in the standing posture Y.

Here, the support portion 71 will be described. The support portion 71 includes the holding body 83 that extends radially inward on the second locking portion 21 side of the inner peripheral surface 12 of the receiving frame member 4 so as to protrude with the circumferential direction as the longitudinal direction, and the holding body 83. Support recesses 92 formed so as to penetrate in the vertical direction on both sides in the circumferential direction.
The support recess 92 includes the first recess 80 and the second recess 85 continuously formed so as to be adjacent to the first recess 80. Both the first recess 80 and the second recess 85 are formed in a rectangular shape in plan view, and the second recess 85 is set shorter in the front-rear direction (radial direction) than the first recess 80. Moreover, the second recess 85 is located radially inward with respect to the first recess 80. The rear end surface (radially outward end surface) of the second recess 85 is in contact with the base end portion of the plate-like ladder frame body 73, that is, the upper end surface 86a of the fitting plate 86, thereby holding the ladder frame body 73 in the standing posture Y. It is set as the holding surface 93 for doing.

  On one side in the radial direction of the inner peripheral surface 12 of the circular opening 3 of the receiving frame member 4, a sandwiched piece 95 that constitutes a part of the prone posture holding means 94 that holds the prone posture X of the ladder frame 73 is provided. Yes. The sandwiched pieces 95 are extended so as to protrude toward the other radial side of the receiving frame member 4, are formed in a flat plate shape, and are arranged in a pair apart from each other in the circumferential direction. The separation width of the sandwiched pieces 95 is a distance corresponding to the separation width of the side plate 74. Further, the sandwiched piece 95 is formed in a substantially triangular shape when the other side edge 95a is along the radial direction and the opposing side 95b opposite to the sandwiched piece 95 is viewed in plan along the radial direction perpendicular to the radial direction. Has been.

  At the front end of the ladder frame 73 (side plate 74), there is an operating portion 96 that constitutes a part of the prone posture holding means 94 for holding the ladder frame 73 in the prone posture X side of each side plate 74. Is provided. The operation unit 96 includes a guide body 97 fixed to the side plate 74 and a sandwiching body 98 that is externally fitted to the guide body 97 so as to be movable (slidable) in the radial direction. The sandwiching bodies 98 each have an opening so as to be externally mounted on the sandwiched piece 95 from the other side in the radial direction, and sandwich the sandwiched piece 95 from above and below. There is provided a biasing means 100 for biasing the sandwiching body 98 toward the sandwiched piece 95 side.

  The biasing means 100 includes a spring seat member 101 fixed to the guide body 97, a spring seat member 102 fixed to the holding body 98, and the spring seat member 101, 102. And a spring body 103 that urges toward the holding piece 95 side. A pressing rod member 104 is provided so as to be passed to both spring seat members 101 and 102 and through which both spring seat members 101 and 102 pass and the spring body 103 is sheathed. An abutting member 106 that abuts against the tip pressed plane 105 of the clamping piece 95 is provided. A stopper (in this case, a nut member) 39 </ b> A for restricting the movement range of the spring seat members 101, 102 on the guide body 97 side is screwed to the proximal end side of the pressing collar member 104. The standing posture holding means 99 that holds the standing posture Y of the ladder frame 73 is configured by the base end structure 72 and the support portion 71.

  FIG. 19 shows another embodiment of the present invention. In the embodiment shown in FIG. 19, a buffer means 110 for buffering an impact that acts to be applied to the first hook 10, particularly the first locking piece 22, when the lid body 1 is mounted or when the lid body 1 is lifted. Is provided.

  As the buffering means 110, a mounting shaft 112 that is separate from the first hook 10 is inserted through the first hook 10 in the vertical direction, and a buffering spring provided between the mounting shaft 112 and the first hook 10. It has a body 113 (a plurality of sets of disc springs are used).

  The attachment shaft body 112 is a bolt body that extends downward from between the first support shaft bodies 24 and has an external thread portion 114 formed on the outer peripheral surface thereof. The external thread portion 114 of the bolt body is exposed to the first hook 10. A recess 116 that is recessed from the bottom to the top is formed, and the buffering means 110 has a spring seat on the bottom surface 117 of the recess 116 and the bottom surface 118 of the nut body 120 that is screwed into the male thread 114. As shown in FIG. The arm wrist portion 37 is connected to the upper portion of the attachment shaft body 112.

  More specifically, an enlarged diameter portion 121 is formed in the middle of the mounting shaft body 112, a flat truncated cone-shaped connection portion 122 is formed on the lower surface of the enlarged diameter portion 121, and is formed on the upper wall of the first hook 10. The attachment shaft body 112 is inserted through the insertion hole 123, and a connection concave portion 124 is formed on the upper surface of the first hook 10.

  With this configuration, the first hook 10 can be finely moved in the non-direction around the coupling portion 122, and the buffer spring 113 is screwed into the bottom surface 117 of the recess 116 and the male screw portion 114. Since the bottom surface 118 is used as a spring seat and is sandwiched between the bottom surfaces 117 and 118, it is possible to absorb an impact that acts to be applied to the first locking piece 22, and the first hook 10, particularly the first hook thereof. The shock acting so as to be applied to the locking piece 22 can be buffered to protect it. Other configurations and operational effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

Side surface sectional view which shows the whole structure of the cover body which shows embodiment of this invention, and its locking device Similarly, a plan sectional view drawn around the first locking part and the second locking part A plan view of the fall prevention device Side sectional view showing the locking posture of both locking parts similarly drawn around the first locking part and the second locking part Side sectional view of the state where the lid is also lifted and locked Side sectional view with the tool inserted Side sectional view with the tool inserted Side sectional view showing the locking posture of the second locking part Similarly, a side cross-sectional view with the lid moved up in the locked position Side surface sectional view which shows an example of a motion of the 2nd hook which similarly moves with the operation | movement which rotates a cover body Side surface sectional view which shows another example of a movement of the 2nd hook which similarly moves with the operation | movement which rotates a cover body A rear view from the outside in the radial direction, mainly depicting the second hook Side sectional view around the first locking part before closing the lid Similarly, a cross-sectional side view showing a state in which the first hook of the first locking portion slides and rotates on the receiving frame member. A side view of the first hook in the locked position again The side view which similarly shows the prone posture and the standing posture of the ladder frame Similarly back view The top view which similarly shows the movement of the ladder frame Side surface sectional drawing centering on the 1st hook which shows other embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cover body, 1a ... Outer peripheral surface, 2 ... Side wall, 3 ... Circular opening, 4 ... Frame member, 5 ... Rib, 6 ... Base part, 7 ... Wall body part, 8 ... Cover body mounting part, 10 ... 1st One hook, 11 ... first locked piece, 12 ... inner peripheral surface, 13 ... tool insertion opening, 14 ... tool, 15 ... operating unit, 16 ... locking device, 17 ... inner peripheral surface, 18 ... small lid , 18a ... outer peripheral surface, 20 ... first locking part, 21 ... second locking part, 22 ... first locking piece, 23 ... base end part, 24 ... first spindle, 25 ... curved part, 26 ... means , 27 ... first support extension part, 28, 29 ... guide recess, 28a ... guide direction, 30 ... spring body, 33 ... moving member, 33a ... axial direction, 34 ... hinge part, 36 ... hinge shaft, 37 ... Arm wrist part, 38 ... radially inner surface, 39 ... stopper, 39a ... horizontal surface, 39b ... inclined surface, 39c ... corner, 40 ... support flange, 41 ... support hole, 4 ... collar part, 43 ... collar member, 44 ... radial inner side surface, 45 ... other end side surface, 49 ... groove, 50 ... second supporting extension part, 51 ... second support shaft body 51 ... second hook, 52b ... curved surface, 53 ... second locking piece, 54 ... second locked piece, 55 ... locked body, 56 ... arm part, 57 ... drooping part, 58 ... inclined part, 60 ... insertion hole, 70 DESCRIPTION OF SYMBOLS ... Fall prevention device, 71 ... Supporting part, 72 ... Base end structure part, 73 ... Ladder frame, 74 ... Side plate, 75 ... Tip plate, 76 ... Lifting assisting saddle member, 77 ... Turning center body, 78 ... Fixed part, 80 ... first recess, 81 ... insertion moving part, 82 ... hook part, 83 ... holding body, 85 ... second recess, 86 ... fitting plate, 87 ... stand-up posture auxiliary frame, 88 ... auxiliary plate, 92 ... Support concave part, 93 ... holding surface, 94 ... prone posture holding means, 95 ... sandwiched piece, 95b ... opposite side, 96 ... operating part, 97 ... Inner body, 98 ... clamping body, 99 ... standing posture holding means, 101, 102 ... spring seat member, 103 ... spring body, 104 ... pressing lever member, 105 ... tip pressed plane, 106 ... contact member, 110 ... Buffer means, 112 ... shaft body, 113 ... buffer spring body, 116 ... concave, 117 ... bottom surface, 118 ... bottom surface, 120 ... nut body, 121 ... diametered portion, 122 ... connecting portion, 123 ... insertion hole, 124 ... Connection recess, b1 ... bolt, b2 ... head, b3 ... bolt, C, D ... unlocking posture, H1 ... predetermined distance, H2 ... predetermined distance, L1 ... predetermined distance, n1 ... nut member, X ... prone posture, Y ... standing posture

Claims (8)

A lid locking device for closing the opening of the receiving frame provided to form an opening,
It has a small lid that closes the tool insertion opening formed in the lid, and has a hook that locks at least a locked piece provided at a portion corresponding to the tool insertion opening of the receiving frame portion from below. The hook can be switched between a locking posture in which the locking portion is located below the locked piece and an unlocking posture in which the hook is avoided from below the locked piece. Means are provided,
The switching means includes a support extending portion that extends downward from the back surface of the lid to a portion corresponding to the side of the tool insertion opening on the back surface of the lid, and the support extending portion. And the support body is supported between the locking posture and the unlocking posture and supports the shaft body between the locking posture and the unlocking posture. A lid locking device, comprising: a guide recess for guiding the side toward and away from the side; and a spring body for biasing the hook to a locking posture.   An angle at which one end side is connected to the hook and the other end side is supported on the back side of the lid and moves in accordance with the change in the posture of the hook, and the guide direction of the guide recess intersects the axis of the moving member 2. The lid locking device according to claim 1, further comprising angle changing means for changing the position of the cover in accordance with a change in the posture of the hook.   The moving member is formed in a bowl shape, and the angle changing means includes a hinge portion that is provided in the support extending portion and supports one end side of the moving member so as to be rotatable about a horizontal axis, and a lid body. 3. The lid locking device according to claim 2, further comprising a movement allowing portion that extends downward on the back surface and allows movement of the moving member on the other end side thereof.   4. The lid locking device according to claim 1, further comprising buffer means for buffering an impact applied to the hook.   A mounting shaft body separate from the hook is inserted in the hook in the vertical direction, and the buffer means has a buffer spring body provided between the mounting shaft body and the hook. Item 5. A lid locking device according to Item 4.   The mounting shaft body is a bolt body that extends downward from the support shaft body and has a male threaded portion formed on the outer peripheral surface, and a concave portion that is recessed from the bottom upward is formed by exposing the male threaded portion of the bolt body to the hook. 6. The lid locking body according to claim 5, wherein the buffer spring body is sandwiched between the bottom surfaces with the bottom surface of the recess and the bottom surface of the nut body screwed into the male screw portion as spring seats. apparatus.   A lid device comprising the locking device according to any one of claims 1 to 6. A lid device comprising: the locking device according to any one of claims 1 to 6; and a hinge provided on a side of the lid opposite to the locking device,
A connecting portion for rotatably connecting the upper end portion of the hinge is provided in the vicinity of a predetermined edge of the lid, and a protruding portion is provided corresponding to the connecting portion toward the inner diameter side of the opening of the receiving frame portion. An insertion hole in the vertical direction is formed in the part, and the inner side surface part of the insertion hole is formed in an inclined surface that is enlarged upward, and a locking piece formed in a hinge is engaged with the protrusion from below. A locked piece that can be stopped is formed,
The hinge has a hanging portion that extends downwardly, and the hanging portion is curved in an arcuate shape so as to protrude outward from the opening opposite to the protruding direction of the protruding portion. A lid device characterized in that the curved inner edge of the hanging portion slides on the inner peripheral surface of the insertion hole of the protrusion when the lid is changed from the open state to the closed state.

Images