JP5258728B2 - Cover structure for underground structures - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention can use a cover structure for an underground structure, in particular, a bar having a tip formed with a hook that is curved in an arc shape, and an insertion hole (hereinafter referred to as a bar) for a lid opening / closing tool (hereinafter referred to as a bar). The present invention relates to a lid structure for an underground structure that can reliably prevent the intrusion of rainwater from a hole) and can easily open and close the lid with a bar.

  For example, a lid structure for an underground structure that opens and closes a communication passage between an underground conduit as an underground structure in a water and sewage system and the ground is composed of a receiving frame installed on the surface of the earth and a lid fitted into the receiving frame. It is configured. Usually, the lid is fitted into the receiving frame by taper fitting in order to suppress rattling noise generated when the vehicle travels on the lid.

  As described above, since the lid is fitted into the receiving frame by taper fitting, a repeated load is applied as the vehicle travels, so that the lid gradually bites into the receiving frame gradually. As a result, when opening the lid, a much stronger force is required than when the lid body is simply lifted, and in some cases, the lid cannot be opened. Therefore, the end of the bar was inserted into the burl hole formed at the edge of the lid, and the lid was opened after the lid was squeezed using the lever principle to release the bite of the lid.

  Patent Document 1 (Japanese Utility Model Laid-Open No. 6-49534) discloses an example of a bar. Hereinafter, this bar is called bar A and will be described with reference to the drawings.

  FIG. 5 is a perspective view showing the bar A, FIG. 6 is a partial perspective view showing a state in which the tip end of the bar A is inserted into the bar hole of the lid, and FIG. FIG. 8 is a partial cross-sectional view showing a state in which the lid is squeezed by the bar A. FIG.

  As shown in FIG. 5, the bar A is formed on the hook 1 that is curved in an upward arc shape formed at the tip thereof, the side projections 2 formed on both side surfaces of the hook 1, and the back surface of the hook 1. The rear projection 3 and the handle 4 attached to the upper part are constituted.

  As shown in FIGS. 6 to 8, the burl hole 35 has a cutout hole 35a formed by cutting out a part of the edge portion on the outer peripheral edge portion of the lid body 36, and a cover formed from the cutout hole 35a. An opening 35b is formed in a portion of the body 36 that is closer to the center.

  In order to open the cover body 36 taper-fitted to the receiving frame 37 with the burl A, the tip of the hook 1 of the burl A is inserted into the burl hole 35 of the cover body 36 as shown in FIG. Tilt A toward the outer periphery (in the direction of the arrow in the figure). As a result, the front end portion of the hook 1 protrudes from the opening 35 b through the notch hole 35 a, and the back projection 3 comes into contact with the receiving frame 37.

  Next, as shown in FIG. 8, when the bar A is further tilted to the outer peripheral side, the lid body 36 is lifted upward with a weak force by the lever principle with the back projection 3 abutting against the receiving frame 37 as a fulcrum. The side protrusions 2 are abutted against the upper surfaces on both sides of the cutout hole 35a. Thus, when the biting of the lid body 36 into the receiving frame 37 is released, the lid body 36 can be opened by pulling up the bar A to the front.

  As described above, if the bar A is used, the lid body 36 biting into the receiving frame 37 can be easily squeezed open, but the burl hole 35 is formed in a state opened to the outer peripheral edge of the lid body 36. Therefore, the lid body 36 does not taper fit with the receiving frame 37 at the open portion. As a result, in particular, when the lid 36 is fitted obliquely to the receiving frame 37, a gap is formed between the open portion and the receiving frame 37, and rainwater or the like may enter the manhole or the like from the open portion. was there.

  Therefore, Patent Document 2 (Japanese Patent No. 4194049) discloses a cover structure for an underground structure that solves the above problem.

  Hereinafter, this underground structure lid structure is referred to as a conventional underground structure lid structure and will be described with reference to the drawings.

  9 is a sectional view showing a conventional underground structure lid structure, FIG. 10 is a sectional view taken along line AA of FIG. 7, and FIG. 11 is a locking member, a compression spring, and a conventional underground structure lid structure, FIG. 12 is an exploded perspective view showing the closed small lid, and FIG. 12 is a partial cross-sectional view showing a lid opening process in the conventional underground structure lid structure, where (a) the closed small lid is switched to the fulcrum position by pushing down the bar B FIG. 5B is a diagram showing a state where the engaging portion of the bar B is moved to the center side by the guide inclined surface, and FIG. The figure which shows the state which released the bite by squeezing the body, (d) is the figure which shows the state which returned the bar B to the upright position, (e) shows the state which rotated the bar B 90 degrees around the axis | shaft Fig. (F) is a view showing a state in which the bar B is tilted to the outer peripheral side and pulled up to unlock the lid. A.

  As shown in FIG. 9, the burl B has a T-shaped engaging portion 38 at the tip and a handle (not shown) at the top.

  As shown in FIGS. 9 to 11, the conventional underground structure lid structure includes a receiving frame 39 installed on the ground surface, a lid body 40 fitted into the receiving frame 39 by taper fitting, and the lid body 40 as the receiving frame 39. The lock member 41 includes a locking member 41 and a closing small lid 42 that closes a later-described burl hole formed in the lid body 40.

  On the inner peripheral surface of the receiving frame 39, an engaging projection 43 that engages an engaging claw described later of the locking member 41 and restricts the lowering of the closing small lid 42 is formed. On the upper surface of the engaging protrusion 43, a stepped portion 44 is provided so as to engage with a stopper protrusion described later of the closing small lid 42.

  A bar hole 45 is formed at a position closer to the center side than the outer peripheral edge of the lid 40. The width dimension (W) of the burl hole 45 is narrower than the length dimension (L) of a bar engaging portion described later (see FIG. 10).

  The locking member 41 is swingably attached by a shaft 46 below the burl hole 45 of the lid 40. An engaging claw 47 that engages with the engaging protrusion 43 is formed on the lower outer peripheral side of the locking member 41, and a guide surface on which a later-described guide pin of the closing small lid 42 slides on the center side of the locking member 41. 48 is formed. A guide hole 49 into which a guide rod (to be described later) of the closing small lid 42 is inserted is formed in the central portion of the locking member 41.

  A guide inclined surface 50 is formed on the upper surface of the closing small lid 42 to engage with an engaging portion of a burl described later. On the outer peripheral side of the closing small lid 42, a stopper that engages with the engaging protrusion 43 and suppresses the lowering of the closing small lid 42 when the closing small lid 42 descends against the elastic force of a compression spring described later. A protrusion 51 is formed. On both side surfaces of the closing small lid 42, guide pins 52 that project on the guide surface 48 of the locking member 41 from the top to the bottom as the closing small lid 42 is lowered project. When the guide pin 52 slides along the guide surface 48, the closed small lid 42 is slightly displaced toward the center when the closed small lid 42 is lowered, whereby the closed small lid 42 is placed on the inner surface of the lid body 40. Descent without interference. On the lower surface of the closing small lid 42, a guide bar 54 is inserted so as to be inserted into the guide hole 49 of the locking member 41 via the compression spring 53. A rubber plate 55 is affixed to a portion of the upper surface of the closing small lid 42 that is in contact with the lower surface of the lid body 40 in order to increase the water-stopping property.

  According to the conventional lid structure for an underground structure constructed as described above, the lid body is opened by the bar as follows.

  First, as shown in FIG. 9, the burl B is inserted into the burl hole 45 with the engaging portion 38 inclined toward the center of the lid 40.

  In the state shown in FIG. 9, the closing small lid 42 is lifted upward by the elastic force of the compression spring 53, whereby the burl hole 45 is closed from below the lid body 40. Further, the locking member 41 is held in a suspended state by its own weight and the elastic force of the compression spring 53, and the engaging claw 47 is positioned below the engaging projection 43 of the receiving frame 39. It is locked.

  Next, as shown in FIG. 12A, the burl B is further inserted into the burl hole 45 until the stopper projection 51 of the closing small lid 42 contacts the upper surface of the engagement projection 43 of the receiving frame 39. At this time, since the guide pin 52 of the closing small lid 42 slides along the guide surface 48 of the locking member 41, the closing small lid 42 is slightly displaced toward the center side when the closing small lid 42 is lowered. The closing small lid 42 descends without interfering with the inner surface of the lid body 40.

  Next, as shown in FIG. 12B, the burl B is made to stand upright. As a result, the outer end of the engaging portion 38 of the burl B comes into contact with the guide inclined surface 50 of the closing small lid 42, and the center side end of the engaging portion 38 of the burl B enters below the lid 40.

  Next, as shown in FIG. 12C, the burl B is tilted to the outer peripheral side. Thereby, the lower end on the outer peripheral side of the engaging portion 38 abuts on the upper surface of the closed small lid 42 and becomes a fulcrum, and the center side end of the engaging portion 38 abuts on the lower surface of the lid body 40 and becomes an action point. The handle of the bar B serves as a power point, and an upward force is applied to the lid body 40 by the lever principle, the lid body 40 is twisted, and the bite into the receiving frame 39 is released.

  Next, as shown in FIG. 12 (d), after the burl B is erected, as shown by the solid line in FIG. The part 38 is brought into contact with the lower surfaces on both sides of the burl hole 35.

  Next, as shown by the phantom line in FIG. 12E, the engaging portion 38 of the bar B is moved to the outer peripheral side. As a result, the pressing portion of the closing small lid 42 by the engaging portion 38 moves to the outer peripheral side from the axial center (C) of the compression spring 53, so that the locking member 41 is caused by the reaction force of the compression spring 53 around this pressing portion. The moment acts in the direction of moving the lower part to the center side. However, at this time, since the stopper protrusion 51 of the closing small lid 42 is prevented from moving toward the center by the step portion 44, the locking member 41 maintains an upright posture.

  Then, as shown in FIG. 12 (f), the lid body 40 is slightly lifted together with the bar B. Accordingly, since the stopper protrusion 51 gets over the stepped portion 44, the locking member 41 is tilted by the elastic force of the compression spring 53 so that the lower portion thereof moves to the center side. As a result, the engaging claw 47 of the locking member 41 is retracted from below the engaging protrusion 43 of the receiving frame 39 to release the locking, so that the lid 40 can be opened if the bar B is further pulled up.

Japanese Utility Model Publication No. 6-49534 Japanese Patent No. 4194049

  According to the above-described conventional lid structure for underground structures, the burl hole 45 is formed at a position closer to the center side than the outer peripheral edge of the lid body 40, and comes into contact with the engagement protrusion 43 of the receiving frame 39 on the closed small lid 42. By forming the stopper protrusion 51, the lid 40 is taper-fitted with the receiving frame 39 over the entire circumference. As a result, there is no fear that rainwater or the like will enter the manhole or the like, and that the bar B can be easily squeezed to release the bite.

  However, in order to engage the burl B with the burl hole 45, it is necessary to rotate the burl 90 ° around its axis as shown in FIG. When the lid 40 is opened and closed, if only the rotation operation of the bar B is performed, the operation of the bar B is easy, but both the rotation operation and the rotation operation must be performed. It is cumbersome and time consuming. Moreover, since the burl B can move freely within the range of the length of the burl hole 45, the positioning of the burl B is difficult and the burl B moves freely. It becomes stable.

  The bar B has a substantially T-shaped tip, and the bar 40 cannot be opened with a bar other than this shape. However, since some municipalities and other business entities have adopted Bar A, the development of a cover structure for underground structures that can use Bar A has been strongly desired.

  In addition, when the bar A is used in the above-described conventional lid structure for underground structures, the position of the bar A becomes unstable due to the hook 1 curved in an arc shape, it is difficult to operate, cannot be twisted, or unlocked. There was a fear that I could not.

  Accordingly, an object of the present invention is to enable use of a bar having a hook that is curved in an arc shape at the tip, and can reliably prevent rainwater from entering from the bar hole and open / close the lid. It is not necessary to rotate the bar around its axis, and the rotation stroke of the bar can be shortened when the lid is twisted, and the twisting force is weak. An object of the present invention is to provide a lid structure for an underground structure that can reliably position the bar when opening the body.

  According to the first aspect of the present invention, an opening / closing operation is performed using a lid opening / closing bar including a hook that is curved in an upward arc shape formed at a tip portion and a back protrusion formed on the back surface of the hook. A cover structure for an underground structure, in which a receiving frame in which an engagement protrusion is formed on an inner peripheral surface, and the hook of the burl is inserted into a position close to the center side from an outer peripheral edge portion that is fitted in the receiving frame. A cover body formed with a burl hole, and a closed small lid that is lifted upward by the elastic force of a spring to close the burl hole and descends against the elastic force of the spring by the burl, In the lid structure for an underground structure, the lowering of the closed small lid is regulated by the closed small lid being brought into contact with the engaging protrusion, and the lid is formed on the center side of the upper surface of the closed small lid by the bar. The hook of the burl A center-side projection is formed on which the bottom surface abuts, and a bottom-surface recessed portion into which the center-side projection or the tip of the hook enters is formed on the bottom surface of the lid that is closer to the center side than the burl hole. It has characteristics.

  According to a second aspect of the present invention, an opening / closing operation is performed using a lid opening / closing bar that is provided with a hook that is curved in an upward arc shape formed at a tip portion and a back projection formed on the back surface of the hook. A cover structure for an underground structure, in which a receiving frame in which an engagement protrusion is formed on an inner peripheral surface, and the hook of the burl is inserted into a position close to the center side from an outer peripheral edge portion that is fitted in the receiving frame. A lid formed with a burl hole, and pivotally supported below the burl hole of the lid, and the engagement projection is engaged with the engagement projection to lock the lid, A locking member that releases the engagement of the engaging claw with respect to the engaging protrusion by a swinging operation by the burl and releases the locking of the lid, and is supported so as to be movable up and down with respect to the locking member. Is lifted upward by the elastic force of the plug to close the burl hole, And a closed small lid that descends against the elastic force of the spring, and the lowering of the closed small lid is controlled by the closed small lid being brought into contact with the engaging protrusion. In the lid structure, a center-side protrusion is formed on the center side of the upper surface of the closed small lid so that the lower surface of the hook of the bar abuts when the cover body is squeezed by the burl. A lower surface recessed portion into which the center side protrusion or the tip of the hook enters is formed on the lower surface of the lid close to the surface, and the outer peripheral side of the upper surface of the closed small lid is moved by the swing operation by the bar. When the engagement claw is disengaged from the engagement protrusion, an outer protrusion on the lower surface of the hook of the burl is formed, and the outer upper surface of the burl hole of the lid is formed on the upper surface of the burr hole. The back projection of the In which it characterized in that the surface recess is formed.

  According to the present invention, it is possible to use a bar having a hook that is curved in an arc shape at the tip, and it is possible to reliably prevent rainwater from entering the bar hole and to open and close the lid. In addition, there is no need to rotate the bar around its axis, and the rotation stroke of the bar can be shortened when the lid is twisted, and the twisting force is weak. It is possible to provide a cover structure for an underground structure that can reliably position the bar when opening.

It is a fragmentary sectional view which shows the cover structure for underground structures of this invention. It is a partial top view which shows the cover structure for underground structures of this invention. It is the sectional view on the AA line of FIG. It is a fragmentary sectional view which shows the opening process in the cover structure for underground structures of this invention, (a) The figure which shows the state which fell the hook of the bar A to the bar hole, and fell down to the center side, (b) is bar A It is a figure which shows the state which inserted the hook of this in the burl hole. It is a fragmentary sectional view which shows the lid opening process in the lid structure for underground structures of this invention, (c) is a figure which shows the state which rotated the bar to the outer peripheral side, inserting the hook of the bar A into the bar hole. (D) is a figure which shows the state which turned the bar A to the upright position, and squeezed the cover body by the lever principle and released the bite. BRIEF DESCRIPTION OF THE DRAWINGS It is a fragmentary sectional view which shows the lid opening process in the lid structure for underground structures of this invention, (e) is a figure which shows the state which fell the bar A to the center side again, (f) is the hook of the bar A It is a figure which shows the state which shifted the outer peripheral side and cancel | released locking of the cover body. It is a fragmentary sectional view which shows the lid opening process in the lid structure for underground structures of this invention, (g) is a figure which shows the state which pulls up the bar A and opens. It is a perspective view which shows the bar A. It is a fragmentary perspective view which shows the state which inserted the front-end | tip part of the bar A in the bar hole of a cover body. It is a fragmentary sectional view which shows the state which inserted the front-end | tip part of the bar A in the bar hole of a cover body. It is a fragmentary sectional view which shows the state which twisted the cover body with the bar A. It is sectional drawing which shows the cover structure for conventional underground structures. It is the sectional view on the AA line of FIG. It is a disassembled perspective view which shows the locking member, compression spring, and obstruction | occlusion small lid of the cover structure for conventional underground structures. It is a fragmentary sectional view which shows the lid opening process in the conventional lid structure for underground structures, (a) The figure which shows the state which switched the obstruction | occlusion small lid to the fulcrum position by pushing down the bar B, (b) It is a figure which shows the state which moved the engaging part of the bar B to the cover center part. It is a fragmentary sectional view which shows the lid opening process in the conventional lid structure for underground structures, (c) is the figure which shows the state which fell bar B to the outer peripheral side, and squeezed the cover body by the lever principle. (D) is a figure which shows the state which returned the bar | burr B to the upright position. It is a fragmentary sectional view which shows the lid opening process in the conventional lid structure for underground structures, (e) is a figure which shows the state which rotated the bar B 90 degree | times around the axis, (f) is the bar B in this side It is a figure which shows the state which fell and lifted and the lock | rock of the cover body was cancelled | released.

  Next, an embodiment of the underground structure lid structure of the present invention will be described with reference to the drawings.

  1 is a partial cross-sectional view showing a cover structure for an underground structure according to the present invention, FIG. 2 is a partial plan view showing a cover structure for an underground structure according to the present invention, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIGS. 4A and 4B are partial cross-sectional views showing the opening process in the underground structure lid structure of the present invention, and FIG. 4A is a diagram showing a state in which the hook of the bar A is tilted to the center of the bar hole, (b) is a view showing a state in which the hook of the bar A is inserted into the burl hole, and (c) is a view showing a state in which the bar is rotated to the outer peripheral side while the hook of the burl A is inserted into the burl hole. (d) shows a state in which the bar A is rotated to an upright position, and the lid is squeezed by the lever principle to release the bite, and (e) shows a state in which the bar A is tilted again to the center side. Fig. (F) shows a state in which the hook of the bar A is shifted to the outer peripheral side to unlock the lid. , (G) is a diagram showing a state in which the open lid by pulling up the bar A.

  As shown in FIGS. 1 to 3, the lid structure for an underground structure according to the present invention includes a receiving frame 5 installed on the ground surface, a lid body 6 fitted into the receiving frame 5 by taper fitting, and the lid body 6 as a receiving frame. 5 includes a locking member 7 that locks against 5 and a closing small lid 8 that closes a later-described burl hole formed in the lid 6 and is attached with a locking member 7 via a spring 20. Note that the locking member 7 may be omitted only by the closing small lid 8.

  The bar A used in the present invention is the same as that shown in FIG. 5, the hook 1 which is formed in the tip portion and curved in an arcuate shape, and the side surfaces which are formed on both side surfaces of the hook 1. It comprises a protrusion 2, a back protrusion 3 formed on the back of the hook 1, and a handle 4 attached to the top. According to the lid structure for an underground structure of the present invention, the bar A can be used for the first time, the operation of the bar A is easy, and the lid 6 can be opened and closed stably.

  On the inner peripheral surface of the receiving frame 5, an engaging projection 9 that engages an engaging claw described later of the locking member 7 and restricts the lowering of the closing small lid 8 is formed.

  A bar hole 10 is formed at a position closer to the center side than the outer peripheral edge of the lid 6. The width dimension (W) of the burl hole 10 is wider than the width dimension (not shown) of a bar hook described later (see FIG. 2). On the lower surface of the lid body 6 which is closer to the center side than the burl hole 10, a lower surface concave portion 11 into which a later-described center side protrusion of the closing small lid 8 or a tip portion of the hook 1 of the burl A enters is formed. On the outer peripheral side upper surface of the burl hole 10 of the lid body 6, an upper surface recessed portion 12 that engages with a back projection described later of the burl A is formed. The top recess 12 may extend to the outer peripheral edge of the lid 6.

  The locking member 7 is swingably attached by a shaft 13 below the burl hole 10 of the lid body 6. An engaging claw 14 that engages with the engaging projection 9 is formed on the lower outer peripheral side of the locking member 7, and a guide surface on which a later-described guide pin of the closing small lid 8 slides on the center side of the locking member 7. (Not shown) is formed, and a guide hole 15 into which a guide rod, which will be described later, of the closing small lid 8 is inserted is formed in the central portion of the locking member 7. These structures are the same as the conventional underground structure lid structure described above.

  On the center side of the upper surface of the closed small lid 8, a central projection 16 is formed on which the lower surface of the hook 1 of the burl A abuts when the lid 6 is squeezed by the burl A. On the outer peripheral side of the upper surface of the closed small lid 8, an outer peripheral projection 17 on which the lower surface of the hook 1 of the burl A abuts when the engagement claw 14 is disengaged from the engagement projection 9 by a swinging operation using the burl. Is formed. On the outer peripheral side of the closing small lid 8, a stopper that suppresses the lowering of the closing small lid 8 by engaging with the engaging protrusion 9 when the closing small lid 8 descends against the elastic force of a compression spring described later. A protrusion 18 is formed. On both side surfaces of the closing small lid 8, guide pins 19 that project on the guide surface of the locking member 7 from the top to the bottom as the closing small lid 8 is lowered project. Similar to the conventional lid structure for underground structures, when the guide pin 19 slides along the guide surface, the closed small lid 8 is slightly displaced toward the center when the closed small lid 8 is lowered. The closed small lid 8 descends without interfering with the inner surface of the lid 6. On the lower surface of the closing small lid 8, a guide rod 21 is provided so as to be inserted into the guide hole 15 of the locking member 7 via the compression spring 20. A rubber plate 22 is affixed to a portion of the upper surface of the closing small lid 8 that is in contact with the lower surface of the lid body 6 in order to increase water-stopping properties.

  According to the lid structure for an underground structure of the present invention configured as described above, the lid body is opened by the bar as follows.

  First, as shown in FIG. 4A, the burl A is tilted substantially horizontally, and the hook 1 is applied to the burl hole 10 of the lid 6. In this state, the closing small lid 8 is lifted upward by the elastic force of the compression spring 20, whereby the burl hole 10 is closed from below the lid body 6. And since the center side protrusion 16 of the closure small lid 8 has penetrated into the lower surface recessed part 11 of the cover body 6, the water stop of the burl hole 10 can be improved also from this point. The locking member 7 is held in a suspended state by its own weight and the elastic force of the compression spring 20, and the engaging claw 14 is positioned below the engaging projection 9 of the receiving frame 5, whereby the lid body 6 is locked. It is in.

  Next, as shown in FIG. 4 (b), the hook 1 is placed in the burl hole 10 of the lid 6 with the burl A tilted, and the stopper projection 18 of the closing small lid 8 is connected to the engagement projection 9 of the receiving frame 5. Insert until it touches the top surface. At this time, since the guide pin 19 (see FIGS. 1 and 11) of the closing small lid 8 slides along the guide surface (see FIG. 11) of the locking member 7, the closing small lid 8 is lowered when the closing small lid 8 is lowered. 8 is slightly displaced toward the center, whereby the closed small lid 8 is lowered without interfering with the inner surface of the lid body 6.

  Next, as shown in FIG. 4C, the bar A is rotated to the outer peripheral side with the hook 1 being inserted into the bar hole 10 of the lid body 6. As a result, the closed small lid 8 descends against the elastic force of the compression spring 20, and the tip of the hook 1 enters under the lid 6.

  Next, as shown in FIG. 4D, the burl A is made upright. As a result, the lower surface of the hook 1 of the bar A comes into contact with the center-side protrusion 16 of the closing small lid 8 and serves as a fulcrum, and the tip of the hook 1 comes into contact with the lower surface of the lid body 6 to serve as an action point. The handle is the power point, and an upward force is applied to the lid body 6 by the lever principle, so that the lid body 6 is twisted and the bite into the receiving frame 5 is released. At this time, since the lower surface of the hook 1 abuts against the center-side protrusion 16 of the closing small lid 8, the stroke of the lid body 6 can be shortened, the twisting time can be shortened, and the twisting force is also weak. Power is enough. When the upper surface of the closed small lid 8 is flattened without forming the central projection 16 on the closed small lid 8, the action point moves to the outer peripheral side as the burl A is rotated, so that it is distorted. The power gradually weakens.

  Next, as shown in FIG. 4E, after the bar A is again tilted to the center side, the hook 1 of the bar A is moved to the outer peripheral projection 17 of the closed small lid 8 as shown in FIG. The bar A is moved to the outer peripheral side until it comes into contact. As a result, the pressing portion of the closing small lid 8 by the hook 1 moves to the outer peripheral side from the axial center (C) of the compression spring 20, so that the locking member 7 is caused by the reaction force of the compression spring 20 around this pressing portion. A moment acts in the direction of moving the lower part toward the center. Thereby, the engaging claw 14 of the locking member 7 is retracted from below the engaging protrusion 9 of the receiving frame 5 and the locking is released.

  And as shown in FIG.4 (g), if the bar A is pulled up, the cover body 6 will raise with the locking member 7, and the cover body 9 can be opened. At this time, the back protrusion 3 of the bar A enters the upper surface recessed portion 12 of the lid body 6, and the tip portion of the hook 1 of the bar A enters the lower surface recessed portion 11 of the lid body 9. The bar A can be pulled up stably.

  As described above, according to the present invention, the following effects are brought about.

(1) It is possible to use a bar in which a hook curved in an arc shape is formed at the tip.
(2) By forming the burl hole 10 at a position closer to the center side from the outer peripheral edge portion of the lid body 6, the center side protrusion 16 of the closed small lid 8 is inserted into the lower surface recessed portion 11 of the lid body 6. Intrusion of rainwater from the burr hole 10 can be reliably prevented.
(3) By using the bar A, it is not necessary to rotate the bar A around its axis when the lid 6 is opened and closed, so that the bar A can be easily operated.
(4) By forming the center-side protrusion 16 on the closed small lid 8, it is possible to shorten the rotation stroke of the burl A when the lid body 6 is squeezed, and the squeezing force is weak.
(5) By forming the lower surface recessed portion 11 on the lower surface of the lid body 6 and causing the tip of the hook 1 of the bar A to enter the lower surface recessed portion 11, the positioning of the bar when the lid body 6 is opened is ensured. Yes. This effect is further promoted by forming the upper surface recessed portion 12 on the outer peripheral side upper surface of the burl hole 10 of the lid 6 and engaging the back protrusion 3 of the bar A with the upper surface recessed portion 12.

A: Bar used in the underground structure lid structure of the present invention B: Bar used in the conventional underground structure lid structure 1: Hook 2: Side projection 3: Back projection 4: Handle 5: Receiving frame 6: Lid 7 : Locking member 8: Closed lid 9: Engaging protrusion 10: Burl hole 11: Lower surface recessed part 12: Upper surface recessed part 13: Shaft 14: Engaging claw 15: Guide hole 16: Center side protrusion 17: Outer peripheral side protrusion 18 : Stopper projection 19: Guide pin 20: Compression spring 21: Guide bar 22: Rubber plate 35: Bar hole 35 a: Notch 35 b: Opening 36: Lid 37: Receiving frame 38: Engaging part 39: Receiving frame 40: Lid 41: Locking member 42: Closed small lid 43: Engaging projection 44: Stepped portion 45: Bar hole 46: Shaft 47: Engaging claw 48: Guide surface 49: Guide hole 50: Guide inclined surface 51: Stopper projection 52: Guide Pin 53 A compression spring 54: guide bar 55: Rubber plate

Claims (2)

A lid structure for an underground structure that is opened and closed using a lid opening / closing bar that includes a hook that is curved in an upwardly arcuate shape formed at a tip portion, and a back projection formed on the back surface of the hook. A receiving frame in which an engagement protrusion is formed on the inner peripheral surface, and a lid body in which a bur hole is inserted into the receiving frame and into which the hook of the bur is inserted at a position closer to the center side from the outer peripheral edge. And a closing small lid that is lifted upward by the elastic force of a spring to close the burl hole and descends against the elastic force of the spring by the burl. In the lid structure for an underground structure that is regulated by a small lid coming into contact with the engaging protrusion,
On the center side of the upper surface of the closed small lid, when the lid is squeezed by the burl, a center-side projection is formed on which the lower surface of the hook of the burl abuts, and the center side of the burl hole is closer to the center side. A lid structure for an underground structure, wherein a lower surface recessed portion into which the center side protrusion or the tip of the hook enters is formed on a lower surface of the lid. A lid structure for an underground structure that is opened and closed using a lid opening / closing bar that includes a hook that is curved in an upwardly arcuate shape formed at a tip portion, and a back projection formed on the back surface of the hook. A receiving frame in which an engagement protrusion is formed on the inner peripheral surface, and a lid body in which a bur hole is inserted into the receiving frame and into which the hook of the bur is inserted at a position closer to the center side from the outer peripheral edge. And is pivotally supported below the burl hole of the lid body, and engages an engagement claw with the engaging projection to lock the lid body, while the rocking operation by the burl A locking member for releasing the locking of the lid by releasing the engagement of the engagement claw with respect to the engagement protrusion, and supported so as to be movable up and down with respect to the locking member, and lifted upward by the elastic force of the spring. The burl hole is closed, and the spring bounce is cut by the burl. And a closed small lid to descend against the force, lowering of the closing the small lid, in underground construction for the lid structure is restricted by the closing small lid comes into contact with the engaging projection,
On the center side of the upper surface of the closed small lid, when the lid is squeezed by the burl, a center-side projection is formed on which the lower surface of the hook of the burl abuts, and the center side of the burl hole is closer to the center side. A lower surface recessed portion into which the center side protrusion or the tip of the hook enters is formed on the lower surface of the lid body, and the outer peripheral side of the upper surface of the closed small lid is formed with respect to the engagement protrusion by the swing operation by the bar. When the engagement claw is disengaged, an outer peripheral protrusion is formed on which the lower surface of the hook of the bar abuts, and the rear protrusion of the bar is formed on the outer peripheral upper surface of the bar hole of the lid. A lid structure for an underground structure, wherein an upper surface recessed portion is formed to engage with.

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