JP4751293B2 - Locking device for iron cover for manhole - Google Patents

Description

  The present invention relates to a locking device for a manhole iron lid, and more particularly to a locking device for a manhole iron lid for locking a manhole iron lid installed on a receiving frame to a receiving frame.

  An iron lid for manholes (hereinafter referred to as an iron lid) is supported by the inner periphery of a receiving frame installed on the surface of the upper end of the underground structure, and this iron lid has a hinge mechanism for opening and closing the iron lid. And a manhole lock device (hereinafter referred to as a lock device) for locking the iron cover to the receiving frame. As this locking device, it is provided with a hook-like projection that engages with the locking projection of the receiving frame, is provided on the opening portion of the iron lid, and is unlocked using a bar or the like. For example, the opening portion of the iron lid 2. Description of the Related Art A locking structure for an underground structure lid (see Patent Document 1) including a locking rod installed in a door and a closing plate for closing an opening of an iron lid is known.

  The locking structure or locking device of Patent Document 1 includes an engaging projection 7 a that engages with a locking projection 2 c formed on the inner peripheral surface of the receiving frame 2, and shaft holes 6 c and 6 d formed on the back surface of the iron lid 3. A lock rod 7 provided with support shafts 7f, 7f and a shaft hole 7h supported in a swingable manner, a support shaft 8d inserted through the shaft hole 7h, and an iron lid 3 formed on the upper end of the support shaft 8d. A closing plate 8 provided with a closing portion 8b that closes the opening 3a formed from below, a coil spring 9 that urges the closing plate 8 upward, and a boot 10 that covers the coil spring 9 from the outside. I have.

And the convex part 8h is formed in the both sides of the said obstruction | occlusion board 8, On the other hand, the inclined surface 7i and 7i which guide this convex part 8h are formed in the said locking rod 7. FIG. Accordingly, when the top surface of the closing portion 8b that closes the opening 3a is pressed downward by the tip of the bar, the entire closing plate 8 moves in a direction away from the receiving frame 2 while being guided by the inclined surfaces 7i and 7i. To do. In the locking structure according to Patent Document 1, by adopting the above-described configuration, the movement trajectory of the closing portion 8b is changed along with the rotation of the entire locking rod 7, and there is a gap between the closing portion 8b and the receiving frame 2. It is intended to prevent the formation.
Japanese Patent No. 3616920

  By the way, in the locking structure or the locking device according to Patent Document 1, as described above, when the upper surface of the closing portion 8b closing the opening 3a is pressed downward by the tip of the bar, the entire closing plate 8 is Since the structure that moves in the direction away from the receiving frame 2 while being guided by the inclined surfaces 7i, 7i is employed, in order to ensure the movement of the entire closing plate 8, the shaft hole 7h and the shaft hole A wide clearance is inevitably required between the support shaft 8d inserted through 7h (unlike that shown in FIGS. 5, 6, and 7 of Patent Document 1). Therefore, in this locking structure or locking device, rattling between the locking rod 7 and the closing plate 8 cannot be avoided, and as a result, the opening 3a is often not reliably closed by the closing portion 8b.

  Therefore, the present invention has been proposed to solve the problems of the above-described conventional manhole iron lid locking structure or locking device, and a member for closing an opening formed in the manhole iron lid; An object of the present invention is to propose a new manhole locking device for manholes which can prevent rattling of the locking rod or the lock body and can reliably close the opening of the iron lid with a closing plate (closing lid). Is.

  In order to achieve the above-described object, the locking device for the manhole iron cover according to the present invention (the invention described in claim 1) is formed with an opening on the inner side and one engagement portion is formed on the inner periphery. The receiving frame and the opening formed in the receiving frame are closed, and a bar hole into which the tip of the bar is inserted is formed, and a manhole iron cover having a pair of left and right bearings formed on the back is locked. An iron lid locking device for manholes, the other hooking portion hooked to one hooking portion formed on the receiving frame, the left and right swing shafts supported by the bearing portion of the iron lid, A lock body having a guide hole formed in a direction perpendicular to the length direction of the swing shaft, a hollow shaft portion that is arranged to be vertically movable in the guide hole, and formed at the upper end of the hollow shaft portion A closing lid for closing the burl hole from below; And a closing lid biasing member that is inserted into the hollow shaft portion of the closing member, and that biases the closing lid portion of the closing member in a direction to close the burl hole of the iron lid, The guide hole has a length extending from a position above the tip of the other hooking portion to a position near the base end of the other hooking portion.

In this invention, the guide hole in which the closing member is guided has a length extending from a position above the tip of the other hooking portion to a position near the base end of the other hooking portion, that is, an effective length of the guide hole. Since the (length of the guide hole with which the hollow shaft portion comes into contact when moving up and down) is configured to be long, rattling between the lock body and the closing member can be effectively eliminated. The burl hole can be reliably closed by the lid. That is, if the backlash between the lock body and the closing member is large, the closing lid portion may not engage with the burl hole, and reliable closing may not be possible. Moreover, according to this invention, as a result of not requiring the inclined surface which comprises the locking structure which concerns on the cited reference 1, when pressing an obstruction member downward with a bar, a big resistance is not applied and an operator's The operability can be further increased.

  In the above invention, rattling between the lock body and the closing member can be effectively eliminated, and as a result, the burl hole can be reliably closed by the closing lid, so that the stone, sand from the closing lid In addition, it can be sealed so that gravel, rainwater and other foreign substances do not enter, and quality can be improved. In addition, when pressing the closing member downward with the bar, a large resistance is not applied and the operability of the operator can be further improved, so that the operability can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. An apparatus for locking a manhole iron cover (hereinafter, in principle referred to as a locking apparatus) 1 according to this embodiment is an apparatus for locking the manhole iron cover 3 installed on the receiving frame 2 shown in FIG. It has a hook-like protrusion 12 (the other engaging part constituting the present invention) that engages with the locking protrusion 2a of the receiving frame 2 that is one engaging part of the present invention. The lock body 4 supported by the bearing portions 3f and 3g shown in FIG. 5 or FIG. 9 of the lid 3 and the closure lid portion 17 which moves up and down in the guide hole 11a of the lock body 4 and is installed horizontally at the upper end The closing member 5 that closes the downward inclined surface 3c having a tapered shape at the peripheral edge of the opening 3 and the closing lid portion 17 of the closing member 5 that is inserted into the closing member 5 is biased to the downward inclined surface 3c of the iron lid 3. The closing lid urging member 6 is provided.

  First, the shape of each element provided in the locking device 1 will be described. As shown in FIG. 1 or FIG. 5, the lock body 4 supported by the iron lid 3 is a side surface of the lock body 11 that forms the main body of the lock body 4 and on the side surface of the receiving frame 2 on the side of the lock projection 2 a. When the iron lid 3 is unfairly opened (opened) from the receiving frame 2 without unlocking the locking device 1, it is formed in a wide hook shape that engages with the locking projection 2 a to prevent unauthorized opening. Further, a pair of swinging shafts are provided on the upper ends of the side surfaces 11f and 11g of the lock body 11 shown in FIG. 2A on an axis substantially parallel to the width direction of the bowl-shaped projection 12. 13 and 14 are projected.

  As shown in FIG. 1 or FIG. 2, the central portion of the recess 11h formed in the central portion sandwiching the swing shafts 13 and 14 intersects with the axis of the swing shafts 13 and 14 at the center portion. A guide hole 11a into which a hollow shaft portion 16 of the closing member 5 described later is inserted is formed on the axis line to be inserted, and a positioning bolt 7 described later is inserted midway intersecting the guide hole 11a as shown in FIG. Bolt holes 11b and 11c are formed, and counterbore 11d and 11e are formed on both sides of these bolt holes 11b and 11c. The lock body 4 swings as will be described later, with a pair of swing shafts 13 and 14 being supported by bearing portions 3f and 3g of the iron lid 3 shown in FIG.

  Next, as shown in FIG. 1 or FIG. 2, the closing member 5 for closing the iron lid 3 is inserted into the guide hole 11a of the lock body 4 so as to move up and down. It is comprised by the obstruction | occlusion lid | cover part 17 which is installed in the upper end of the part 16, and fits in the downward slope 3c mentioned later of the iron lid | cover 3. Among these, the hollow shaft portion 16 is slightly inclined in the counterclockwise direction shown in the figure with respect to the vertical line of the closing lid portion 17 at a position closer to the right side of the closing lid portion 17 shown in FIG. The outer diameter of the hollow shaft portion 16 is formed such that the hollow shaft portion 16 can move up and down within the guide hole 11a of the lock body 4, and the hollow hole 16b that is the inner diameter of the hollow shaft portion 16 is formed in the hollow hole 16b. A closing lid urging member 6 (described later) inserted into the slidable member is formed so as to be able to expand and contract.

  Further, on the lower side of the wall portion of the hollow shaft portion 16, elongated holes 16a and 16a shown in FIG. The hole widths of the elongated holes 16a, 16a are formed so that the closing member 5 can move up and down in a state where a positioning bolt 7 described later is inserted (see FIG. 3). Has been.

  Further, the closing lid portion 17 of the closing member 5 has a tapered downward inclined surface 3c (see FIG. 5) whose side surface except the left side surface shown in FIG. 2 (b) is formed below the opening 3b of the iron lid 3. ) And a tapered upward inclined surface 17a. Then, the closing member 5 is urged upward by a closing lid urging member 6 described later, and the upward inclined surface 17a of the closing lid portion 17 is fitted to the downward inclined surface 3c of the iron lid 3, so that the iron lid 3 is closed.

  Next, the closing lid urging member 6 that urges the closing lid 17 to the iron lid 3 is formed in a spiral compression coil spring as shown in FIG. The upper end is in contact with the upper end of the hollow hole 16b, and the lower end is in contact with a positioning bolt 7 described later. The free length of the closing lid biasing member 6 is such that the hollow shaft portion 16 of the closing member 5 rises in the guide hole 11 a of the lock body 11, and the lower end of the long hole 16 a of the hollow shaft portion 16 contacts the positioning bolt 7. It is formed in a free length capable of urging the closing member 5 upward to the rising end position of the closing member 5 in contact therewith.

  Next, as shown in FIG. 3, the positioning bolt 7 has a male screw (not shown) at the distal end portion of the body portion having a diameter smaller than the inner diameters of the long holes 16a and 16a of the hollow shaft portion 16 extending from the head (not shown). The symbol is omitted). And from one counterbore 11d side of the lock body 11, it is inserted into one shaft hole 11b, the long holes 16a and 16a of the hollow shaft portion 16, and the other shaft hole 11c on the other counterbore 11e side of the lock body 11, A nut 8 is screwed to the male screw at the tip, and the positioning bolt 7 is fixed to the lock body 11. In this state, the hollow shaft portion 16 is located between the rising end position where the lower ends of the elongated holes 16a, 16a abut against the positioning bolt 7 and the lowered end position where the upper ends of the elongated holes 16a, 16a abut against the positioning bolt 7. It can be moved up and down.

  Next, as shown in FIG. 1, the lock body urging member 9 includes one coil portion 9 a that can be inserted into one swing shaft 13, and the other coil portion 9 b that can be inserted into the other swing shaft 14. The upper spring leg 9c and the lower spring leg 9f constituting the torsion spring extend in the tangential direction on one coil part 9a, and the other coil part 9b has The upper spring leg 9d and the lower spring leg 9g constituting the torsion spring each extend in a tangential direction. Of these, the lower spring legs 9f and 9g are connected by a connecting portion 9h parallel to the axis of the coil portions 9a and 9b.

  In the lock body urging member 9 formed in this way, the coil portions 9a and 9b are inserted into the swing shafts 13 and 14 of the lock body 4 shown in FIG. 9g are brought into contact with the side surface opposite to the hook-shaped protrusion 12 on the side surface of the lock body 11 shown in FIG. 2 (b), and the upper spring legs 9c, 9 are shown in FIG. The lock body 4 is pressed against the lock projection 2a side of the receiving frame 2 by the torsion spring force of the coil portions 9a and 9b, in contact with the lower surface 3d of the opening edge of the iron lid 3.

  Next, an embodiment according to the locking device 1 for an iron lid for manhole as an assembly including the above-described elements will be described. As shown in FIG. 2 (a) or FIG. 3, the lock body 4 has a hollow shaft portion 16 in which the closing lid biasing member 6 is inserted in advance in the hollow hole 16b in the guide hole 11a of the lock body 11. The elongated holes 16a and 16a and the bolt holes 11b and 11c of the lock body 11 are inserted so as to be coaxial, and the positioning bolt 7 is connected to one shaft hole 11b of the lock body 11 and the hollow shaft portion. 16 is inserted into the long holes 16 a and 16 a and the other shaft hole 11 c of the lock body 11, and a nut 8 is screwed into the male screw at the tip, and the positioning bolt 7 is fixed to the lock body 11.

  When the positioning bolt 7 is inserted, when the positioning bolt 7 is inserted into the elongated holes 16a and 16a of the hollow shaft portion 16, the guide holes 11a of the lock body 11 and the hollow holes 16b of the hollow shaft portion 16 are inserted. The positioning bolt 7 is inserted from the respective lower end openings while pushing up the lower end of the urging member 6 upward by the bifurcated tip of the bifurcated tool having an inner width that does not interfere with the positioning bolt 7 to be inserted. The closing member 5 moves up and down in the guide hole 11a of the lock body 11 while being biased upward by the closing lid biasing member 6, and is closed by the lower end surfaces of the long holes 16a and 16a of the hollow shaft portion 16. 5 is regulated by the upper end surfaces of the long holes 16a and 16a.

  Since the closing member 5 is biased upward by the closing lid biasing member 6 shown in FIG. 2B, the upward inclined surface 17a of the closing lid 17 is directed downward of the iron lid 3 shown in FIG. The opening 3b of the iron lid 3 is closed by fitting to the inclined surface 3c. Note that the flange 17b of the closure lid portion 17 shown in FIG. 5 is an iron lid when the upward inclined surface 17a is fitted to the downward inclined surface 3c of the iron lid 3 (the reference numeral is omitted). 3 does not contact the lower surface 3d of the opening edge portion. On the other hand, when the lid upper surface 17c of the closing lid portion 17 is pressed downward against the biasing force of the closing lid biasing member 6, the hollow shaft portion 16 of the closing member 5 is locked as shown in FIG. The sliding member 5 slides downward in the guide hole 11a of the body 11, and the closing member 5 is lowered to the lower end side shown in FIG.

  Further, as shown in FIG. 2 (a) or FIG. 3, the lock body urging member 9 has coil portions 9a and 9b inserted into the swing shafts 13 and 14 of the lock body 4, and the lower spring legs 9f, The connecting portion 9h that connects 9g is brought into contact with the side surface of the side surface of the lock body 11 opposite to the hook-shaped protrusion 12 shown in FIG. 2B, and the upper spring legs 9c, 9 are the openings of the iron lid 3. Abutting against the edge lower surface 3d (see FIG. 6), the lock body 4 is urged toward the lock projection 2a side of the receiving frame 2 by the torsion spring force of the coil portions 9a and 9b.

  Next, the function and effect will be described while explaining the method of using the above-described manhole locking device 1 for manhole. In the manhole where the locking device 1 according to the present embodiment is installed, a receiving frame 2 shown in FIG. 5 is installed on the surface of the upper end of the underground structure, and an iron lid 3 is supported on the inner periphery of the receiving frame 2. The iron lid 3 is provided with a hinge mechanism (not shown) for opening and closing the iron lid 3 and connected to the receiving frame 2, and a locking device 1 for locking the iron lid 3 to the receiving frame 2 is provided in the opening of the iron lid 3. It is installed below 3b. Among these, the opening 2b is formed in the inner periphery of the receiving frame 2, and the outer periphery 3a shown in FIG. 9 of the iron lid 3 is fitted into this opening 2b, and stones, sand, gravel, rainwater, etc. It is sealed so that no foreign matter enters.

  The locking device 1 installed on the iron lid 3 is configured as an assembly shown in FIGS. 2 and 3, and the swing shafts 13 and 14 thereof are bearing portions 3 f of the iron lid 3 shown in FIG. 5 or FIG. 9. , 3g, the locking device 1 is swingably supported by the bearing portions 3f, 3g of the iron lid 3. In the locking device 1 in this state, since the closing member 5 is urged upward by the urging member 6 shown in FIG. 5, the tapered upward inclined surface 17 a formed on the side surface of the closing lid portion 17 is iron. While contacting the tapered downward inclined surface 3c of the lid 3, the upward inclined surface 17a of the closed lid portion 17 and iron are caused by the wedge action of the upward inclined surface 17a of the closed lid portion 17 and the downward inclined surface 3c of the iron lid 3. The lid 3 is closed in a state of being securely fitted to the downward inclined surface 3c.

  The bearing portions 3f and 3g of the iron lid 3 into which the swing shafts 13 and 14 are inserted are swing shafts 13 and 14 on both sides shown in FIG. 9 below the opening 3b shown in FIG. The bearing portions 3f and 3g into which can be inserted are recessed. In addition, a relief portion 3h is formed in the left bearing portion 3f in the drawing, and a set bolt 21 for preventing the swing shaft 13 from moving is detachably installed. The rocking shafts 13 and 14 are inserted in advance by removing the set bolt 21 and inserting the right rocking shaft 14 into the bearing portion 3g and the left rocking shaft 13 from the relief portion 3h. After being inserted into the bearing portion 3 f, the set bolt 21 is inserted into the relief portion 3 h and tightened with the nut 22. Due to the fastening of the set bolt, the swing shaft 13 cannot escape from the bearing portion 3f.

  Therefore, the opening 3b of the iron lid 3 is sealed so that stones, sand, gravel, rainwater and other foreign substances do not enter. Note that the contour shapes of the opening 3b and the downward inclined surface 3c of the iron lid 3 into which the upward inclined surface 17a of the closing lid portion 17 is fitted are shapes corresponding to the closing lid portion 17 shown in FIG. Is a half-oval shaped opening window with the left side cut out.

  Further, the locking device 1 in this state has the hollow shaft portion 16 of the closing member 5 slightly inclined in the counterclockwise direction shown in the figure with respect to the vertical line of the closing lid portion 17 as shown in FIG. The locking device 1 supported by the rocking shafts 13 and 14 on the bearing portions 3f and 3g of the lid 3 is urged toward the locking protrusion 2a side of the receiving frame 2 by an inclined component force due to its own weight. .

  Further, in the locking device 1, the coil portions 9a and 9b of the lock body urging member 9 shown in FIG. 9 are inserted into the swing shafts 13 and 14 of the lock body 4, and the connecting portion 9h is shown in FIG. Since the upper spring legs 9c and 9d are in contact with the lower surface 3d of the opening edge of the iron lid 3 (see FIG. 6). The lock body 4 is biased toward the lock projection 2a side of the receiving frame 2 by the torsion spring force of the coil portions 9a and 9b. Therefore, in the state where the locking device 1 shown in FIG. 5 is not unlocked, if the iron lid 3 is to be unreasonably opened from the receiving frame 2, the hook-like projections 12 of the iron lid 3 are locked to the receiving frame 2. The iron lid 3 cannot be opened by engaging with the stop protrusion 2a.

  In addition, in order to open the iron lid 3, the bar 19 which is a lid opening tool is used, but the lower front surface of the bar 19 is a projecting piece having a wide pressing surface 19a shown in FIG. As shown in FIG. 7, the pressing surface 19a on the side surface side is formed with a narrower width than the front side. Further, a back surface 19e is formed on the left back surface shown in FIG. 7, and an inclined surface 19b is formed on the continuous upper side. In addition, an operation handle (not shown) for vertically moving or rotating the bar 19 for opening or closing the iron cover 3 is provided above the base axis of the bar 19 so as to cross in a cross shape. Has been.

  And in order to unlock the locking device 1 locked as described above, the wide side of the protruding piece of the bar 19 is made to correspond to the longitudinal direction of the opening 3b of the iron lid 3 shown in FIG. The opening 3b is inserted in the width direction of the front and back of the illustrated paper surface corresponding to the narrow width side of the protruding piece, and the pressing surface 19a of the burl 19 is brought into contact with the lid upper surface 17c of the closing lid portion 17 so that the burl 19 The bar 19 is pushed downward by the operating handle to lower the locking device 1 downward. By this pressing operation, the upward inclined surface 17a of the closing lid portion 17 is separated from the downward inclined surface 3c of the iron lid 3, and the opening 3b of the iron lid 3 is released from the closed state.

  Next, while the pressing surface 19a of the burl 19 is in contact with the lid upper surface 17c of the closing lid portion 17, the direction of the burl 19 is changed from the state of FIG. As shown in the figure, the inclined surface 19b and the back surface 19e are turned 90 degrees so as to face the opening 2b of the receiving frame 2 adjacent to the left side of the opening 3b of the iron lid 3 in the drawing. Next, while the pressing surface 19a of the burl 19 is in contact with the lid upper surface 17c of the closing lid portion 17, the pressing surface 19a of the burl 19 is slid to the left in the figure, and the burl 19 is moved downward as shown in FIG. Press down.

  By pushing down the bar 19, the lid upper surface 17 c of the closing lid 17 is pressed downward by the abutting part 19 c of the bar 19, and the locking device 1 is illustrated with its pivot shafts 13 and 14 as the center. The lock body urging member 9 is swung counterclockwise against the urging force of the lock body urging member 9. Note that the amount of sliding of the bar 19 toward the left side in the drawing can be made closer to the opening 2b side of the receiving frame 2 than in the drawing, thereby facilitating the rocking operation of the locking device 1. Then, as the locking device 1 swings counterclockwise, the hook-shaped protrusion 12 of the lock body 4 is separated from the engageable position below the locking protrusion 2a of the receiving frame 2, and the iron cover with the locking device 1 remains as it is. Even when 3 is pulled up from the receiving frame 2, the locking device 1 is in an unlocked state in which the hook-shaped protrusion 12 does not engage with the locking protrusion 2 a of the receiving frame 2.

  Next, while maintaining the unlocked state of the locking device 1 shown in FIG. 8, the inclined surface 19 b of the burl 19 is in contact with the upper corner 2 c of the opening of the receiving frame 2 adjacent to the left side of the opening 3 b of the iron lid 3. When the burl 19 is pulled up, the closing member 5 is urged upward by the closing lid urging member 6, so that the lid upper surface 17 c of the closure lid 17 abuts against the abutting portion 19 c of the burl 19. It rises in the state. In this operation, the inclined surface 19b of the burl 19 does not have to be brought into contact with the upper opening angle 2c of the receiving frame 2, but the operability is stabilized by making contact.

  Then, when the bar 19 is continuously pulled up, the opening contact surface 19f and the opening contact surface 19g of the bar 19 (see FIG. 6) eventually become the periphery of the downward inclined surface 3c of the iron cover 3 shown in FIG. The lid opening contact surface 19f that is in contact with the lower surface 3d of the opening edge (located on the front side in the figure (the surface side of the paper)) contacts the lower surface 3d on the front side of the edge of the downwardly inclined surface 3c and is on the side facing the illustration. The lid opening contact surface 19g located on the (back side of the paper surface) contacts the opening edge portion lower surface 3d on the opposite side of the peripheral edge of the downward inclined surface 3c), and further pulling up the burl 19, the bar 19 With the lid opening contact surfaces 19f and 19g, the iron lid 3 is separated from the frame body 2 together with the locking device 1 with the opening 3b side of the iron lid 3 around a hinge mechanism (not shown) connected to the receiving frame 2 as a rotation center. Open the lid. In addition, the procedure for fitting the iron lid 3 to the frame body 2 can be fitted by a procedure almost opposite to the procedure for opening the lid.

  In the locking device 1 configured as described above, the guide hole 11a in which the closing member 5 is guided extends from a position above the tip of the hook-shaped protrusion 12 to a position near the base end of the hook-shaped protrusion 12. Therefore, since the effective length of the guide hole 11a (the length of the guide hole 11a with which the hollow shaft portion 16 comes into contact with the vertical movement) can be configured to be long, the gap between the lock body 4 and the closing member 5 can be reduced. The rattling can be effectively eliminated, and as a result, the opening 3b and the tapered downward inclined surface 3c of the iron lid 3 can be reliably closed by the closing lid portion 17.

  That is, if the backlash between the lock body 4 and the closing member 5 is large, the closing lid portion 17 may not engage with the opening 3 b of the iron lid 3, and reliable closing may not be possible. In addition, according to the present invention, the inclined surface constituting the locking structure according to the cited document 1 is not required. As a result, when the closing member 5 is pressed downward with the burl 19, a large resistance is not applied. The user's operability can be further enhanced.

  Further, the closing lid portion 17 of the closing member 5 shown in FIG. 5 is configured such that the upward inclined surface 17a that can be fitted to the downward inclined surface 3c formed in the opening 3b of the iron lid 3 is formed on the side surface. The opening portion of the iron lid 3 and the side surface of the closing lid portion 17 are securely fitted and closed by the wedge action of the downward inclined surface 3c and the upward inclined surface 17a. Therefore, it can seal so that a stone, sand, gravel, rainwater, and other foreign substances may not enter from the opening 3b of the iron lid 3.

  Further, the rocking shafts 13 and 14 of the locking device 1 shown in FIG. 2 are configured to be hooked with a lock body urging member 9 that urges the locking device 1 toward the locking projection 2 a of the receiving frame 2. Therefore, in the locking device 1, when the iron lid 3 is fitted to the receiving frame 2, the hook-like protrusion 12 of the locking device 1 is urged toward the locking protrusion 2 a of the receiving frame 2 by its own weight. However, since the hook-shaped protrusion 12 is urged toward the locking protrusion 2 a of the receiving frame 2 by the lock body urging member 9, the hook-shaped protrusion 12 is reliably urged toward the locking protrusion 2 a of the receiving frame 2. Is done.

  In the embodiment of the locking device for the manhole iron cover according to the present invention, the lock body 4 is constituted by the lock body 11, the hook-like protrusion 12 and the swing shafts 13 and 14, and the closing member 5 is a hollow shaft. Although integrally molded by the part 16 and the closing lid part 17, some or all of these may be separable.

It is a perspective view which shows each component of the locking device of the iron cover for manholes concerning embodiment of this invention. It is explanatory drawing which shows the form at the time of locking of the locking apparatus of an iron lid, Comprising: (a) is a front view, (b) is AA arrow sectional drawing of (a). It is BB arrow sectional drawing of FIG.2 (b). It is explanatory drawing which shows the form at the time of unlocking of the locking apparatus of an iron lid, Comprising: (a) is a front view, (b) is CC sectional view taken on the line of (a). It is explanatory drawing which shows the form at the time of locking of the locking device installed in the iron lid, Comprising: It is a longitudinal cross-sectional view. It is explanatory drawing which shows the form in the initial stage of the unlocking operation of the locking device installed in the iron cover, Comprising: It is a longitudinal cross-sectional view. It is explanatory drawing which shows the form in the middle of the unlocking operation of the locking device installed in the iron cover, Comprising: It is a longitudinal cross-sectional view. It is explanatory drawing which shows the form of unlocking of the unlocking operation of the locking device installed in the iron cover, Comprising: It is a longitudinal cross-sectional view. It is explanatory drawing which shows the form of the locking device installed in the iron cover, Comprising: It is the arrow D bottom view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locking device of iron cover for manholes 2 Receiving frame 2a Locking protrusion 3 Iron cover 3b Opening 3c Downward inclined surface 3f, 3g Bearing part 4 Locking body 5 Closing member 6 Closing cover urging member 9 Locking body urging member 11 Locking body 11a Guide hole 11b, 11c Bolt hole 12 Hook-shaped projection 13, 14 Oscillating shaft 16 Hollow shaft portion 16a Long hole 16b Hollow hole 17 Closing lid portion 17a Upward inclined surface 17c Top surface of cover 19 bar

Claims (1)

An opening is formed on the inner side, and a receiving frame formed with one hooking portion is formed on the inner periphery, and a burl hole is formed to close the opening formed in the receiving frame and into which the tip of the burl is inserted. The locking device for the manhole cover for locking the manhole cover with a pair of left and right bearings formed on the back surface,
The other hooking portion hooked to one hooking portion formed on the receiving frame, the left and right swing shafts supported by the bearing portion of the iron lid, and the direction perpendicular to the length direction of the left and right swing shafts A lock body having a guide hole formed therein,
A closing member having a hollow shaft portion which is arranged to be movable up and down within the guide hole, and a closing lid portion which is formed at the upper end of the hollow shaft portion and closes the burl hole from below;
A closing lid urging member that is inserted into the hollow shaft portion of the closing member and biases the closing lid portion of the closing member in a direction to close the burl hole of the iron lid,
The manhole iron cover locking device according to claim 1, wherein the guide hole has a length extending from a position above the tip of the other hooking portion to a position near the base end of the other hooking portion.