JP2007224687A - Locking device of iron lid for manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device of an iron lid for a manhole by which a small lid for closing a hook hole formed in the iron lid can be smoothly moved up and down upon the opening/closing of the iron lid. <P>SOLUTION: The locking device of the iron lid for the manhole comprises a lock body 3 rotatably fitted to a lower part of the iron lid buried in a receiving frame, the hook hole formed at the iron lid, the small lid 10 rotatably fitted to the lock body 3 to close the hook hole, and a hook receiver formed in the receiving frame. The lock body 3 has a hook 7 engaged with the hook receiver. When the iron lid is closed, the lock body 3 is rotated around a pivotally supporting part, supporting the iron lid, in the direction that the hook 7 is engaged with the hook receiver, and the small lid 10 is moved up so that the hook hole may be closed. When the iron lid is opened, the lock body 3 is rotated around the pivotally supporting part in the direction that the hook 7 is released from the hook receiver as the small lid 10 moves down. The locking device includes a guide means for guiding the up/down movement of the small lid 10. The guide means comprises a projection 12 formed on the small lid 10 and a guide channel formed in the iron lid for the up/down movement of the projection 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a locking device for an iron lid for manholes, and more particularly to a locking device for an iron lid for manholes that can smoothly lift and lower a small lid that closes a hand fist hole formed in the iron lid.

  Conventionally, as an iron lid locking device fitted in a receiving frame, there is one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 9-25639). Hereinafter, this locking device will be referred to as a conventional locking device and will be described with reference to the drawings.

  FIG. 7 is a sectional view showing a state in which the iron lid is locked by the conventional locking device, and FIG. 8 is an assembled perspective view showing the conventional locking device.

  7 and 8, 21 is a receiving frame having a hook receiver 21A formed on the inner surface, 22 is an iron lid fitted into the receiving frame 21, and 23 is an L-shaped lock body having a weight 23A in the lower part. . Reference numeral 24 denotes a rotating shaft that projects horizontally (parallel to the iron lid 22) on both side surfaces of the upper portion of the lock body 23. The rotating shaft 24 is rotatably fitted in a pair of grooves 25 formed opposite to each other at a lower portion near the periphery of the iron lid 22. As a result, the lock body 23 pivots in a plane orthogonal to the iron lid 22. An extraction preventing bolt 26 is inserted into the entrance of the groove 25 so that the rotary shaft 24 does not come out of the groove 25. Reference numeral 27 denotes a hook provided at one end of the lock main body 23, and engages with the hook receiver 21 </ b> A of the receiving frame 21 to lock the iron lid 22 when the iron lid is closed.

  When the iron lid is closed, the lock body 23 rotates about the rotation shaft 24 in the direction in which the hook 27 engages with the hook receiver 21A due to the weight of the weight 23A. The hole 30 (described later) is closed. On the other hand, when the iron lid is opened, the lock body 23 rotates in a direction in which the hook 27 is detached from the hook receiver 21A against the weight of the weight 23A around the rotation shaft 24 as the small lid is lowered. Reference numeral 28 denotes a stopper that protrudes below the rotation shaft 24 of the lock main body 23 to limit the rotation of the small lid. Reference numeral 29 denotes a pair of arms fixed to the rotating shaft 24. On the inner side of the distal end of the arm 29, an engaging shaft 29A that is rotatably fitted in a groove formed in the small lid is formed facing the arm 29. ing.

  Reference numeral 30 denotes a hand fist hole formed in the iron lid portion corresponding to the mounting position of the lock body 23. The hand hole 30 is formed in a tapered shape, and a step portion 30A with which the small lid comes into contact is formed on the inner peripheral surface thereof. Reference numeral 31 denotes a small lid for closing the hand fist hole 30 having a weight 31 </ b> A at the bottom. The side surface of the small lid 31 is formed in a tapered shape so as to match the tapered hand fist hole 30. The small lid 31 has grooves 31B formed on both lower side surfaces thereof, and an engagement shaft 29A of the lock body 23 is rotatably fitted in the groove 31B. The small lid 31 moves up and down while maintaining the level by the weight of the weight 31A.

  A method of opening and closing the iron lid by the conventional locking device configured as described above will be described with reference to the drawings.

  FIG. 9 is a view showing an open / closed state of an iron lid by a conventional locking device, (A) is a cross-sectional view showing a state in which a handpiece is inserted into a hand fistula hole, and (B) is inserted into a hand fistula hole. Sectional drawing which shows the state which rotated the handpiece 90 degrees, (C) is sectional drawing which shows the state which pulled up the handpiece to the front and lifted the iron lid. 9, the same reference numerals as those in FIGS. 7 and 8 denote the same components.

  As shown in FIG. 9 (A), the T-shaped tip 32A of the hand hook 32 is inserted into the hand hook hole 30 and pushed downward. As a result, the small lid 31 for closing is pushed down while maintaining the level. Since the length of the T-shaped tip 32A is longer than the width of the hand fist hole 30, the hand fist 32 is brought into the hand fist hole 30 unless the T-shaped tip 32A is aligned with the longitudinal direction of the hand fist hole 30. Can't insert. When the small lid 31 is pushed down in this way, the lock main body 23 rotates counterclockwise in FIG. 9A around the rotation shaft 24, and the hook 27 comes off from the hook receiver 21A, and iron The locking of the lid 22 is released. When the lock of the iron lid 22 is released in this way, the hand 32 is rotated 90 ° around its axis as shown in FIG. 9B. In this case, since the small lid 31 is pushed down while maintaining the horizontal state, the hand 32 can be easily rotated around the axis. As a result, the T-shaped tip 32A of the hand hook 32 and the hand hook hole 30 are engaged, and the hand hook 32 does not come out of the hand hook hole 30. In this way, when the handle 32 is hooked in the handle hole 30, the handle 32 is pulled up as shown in FIG. 9C. Thereby, the iron lid 22 is opened.

  On the other hand, in order to close the iron lid 22, the iron lid 22 may be fitted into the receiving frame 21 as it is. In this case, since the small lid 31 hits the stopper 28 of the lock body 23, the small lid 31 is not rotated in the clockwise direction in FIG. 9 and the weight 31A does not protrude from the iron lid 22. When the iron lid 22 is fitted into the receiving frame 21, the lock body 23 naturally rotates due to its own weight 23A, and the hook 27 engages with the hook receiver 21A. At the same time, the small lid 31 is raised by the lock body 23 and the hand hole 30 is automatically closed. Since the upper surface of the small lid 31 is slightly lower than the upper surface of the iron lid 22, even if a car or the like passes over the hand hole 30, the small lid 31 is pushed down, and the hook 27 is detached from the hook receiver 21A and locked. There is no fear of being released.

JP-A-9-25639

  However, the conventional locking device described above has the following problems. That is, the small lid 31 is unstable with respect to the lock main body 23 because it is rotatably supported only by engaging the engagement shaft 29A of the lock main body 23 in the groove 31B of the small lid 31. It was. As a result, when the iron lid 22 is opened and closed, the small lid 31 may come into contact with the inner surface of the iron lid 22 and the small lid 31 may not be raised and lowered smoothly. This problem does not matter so much when the iron lid 22 is opened, because the small lid 31 is forced down by the hand 32. However, when the iron lid 22 is closed, the small lid 31 has its weight 31A. Since it rose by its own weight, there was a risk that the small lid 31 would be caught on the inner surface of the iron lid 22 and not rise.

  Accordingly, an object of the present invention is to provide a locking device for a manhole iron lid that can smoothly lift and lower a small lid that closes a hand fist hole formed in the iron lid when the iron lid is opened and closed.

  According to the first aspect of the present invention, there is provided a lock body rotatably attached to a lower portion of an iron lid that is fitted into a receiving frame, a hand hole formed in the iron lid, and a lock body rotatably attached to the lock body. A small lid for closing the hand fist hole and a hook receiver formed on the receiving frame, and the lock body has a hook that engages with the hook receiver, and when the iron lid is closed, the lock The main body pivots in a direction in which the hook engages with the hook receiver around a pivotal support with the iron lid, raises the small lid to close the hand fist hole, and when the iron lid is opened, The lock body guides the lifting and lowering of the small lid in a locking device for an iron lid for manholes, in which the hook rotates in a direction to be removed from the hook receiver around the shaft support as the small lid is lowered. Having guide means, said guide hand , Said a protrusion formed on the small lid, which is formed on the iron cover, said projections are those having features that consist a guide groove for vertically.

  According to a second aspect of the present invention, there is provided a lock body rotatably attached to a lower portion of an iron lid that is fitted in a receiving frame, a hand hole formed in the iron lid, and a lock body that is rotatably attached to the lock body. The lock body includes a small lid for closing the hand fistula hole and a hook receiver formed on the receiving frame, and the lock body has a hook that engages with the hook receiver, and the lock body is closed when the iron cover is closed. Is pivoted in a direction in which the hook engages with the hook receiver around a pivotal support with the iron lid, and the small lid is raised to close the hand fistula and when the iron lid is opened, The lock body is a guide for guiding the raising and lowering of the small lid in the locking device for the iron cover for manholes, in which the hook is rotated in the direction of detaching from the hook receiver around the shaft support portion as the small lid is lowered. Said guide means , And it has the characteristics that consist the a protrusion formed on an iron lid, and the guide groove which moves up and down along said protrusion formed on the small lid.

  According to a third aspect of the present invention, in the first aspect of the present invention, a stopper is formed on the upper portion of the protrusion, and a stopper receiver for receiving the stopper is formed on the lower portion of the guide groove. It is what has.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, a stopper is formed at the upper part of the guide groove, and a stopper receiver for receiving the stopper is formed at the lower part of the projection. It is what has.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the spring includes a spring that applies a rotational force in a direction in which the hook engages with the hook receiver to the lock body. It has a feature in being.

  According to the present invention, by providing the guide means for guiding the raising and lowering of the small lid that closes the hand fist hole formed in the iron lid, the small lid smoothly contacts the receiving frame when the iron lid is opened and closed. It is possible to reliably prevent a situation in which the small lid does not rise when the iron lid is closed, particularly when the iron lid is closed. Furthermore, by providing the guide means with a stopper and a stopper receiver for receiving the stopper, it is possible to reliably prevent the small lid from falling off the iron lid.

  Next, an embodiment of the locking device for manhole iron cover according to the present invention will be described with reference to the drawings.

  FIG. 1 is an assembled perspective view of a small lid and a lock body of the locking device of the present invention, FIG. 2 is a partial sectional view showing an iron lid of the locking device of the present invention, and FIG. 3 is a view in the direction A of FIG. 4 is a cross-sectional view showing a state where the small lid and the lock body of the locking device of the present invention are attached to the iron lid, and FIG. 5 is a view in the direction B of FIG.

  1 to 5, reference numeral 1 is a receiving frame having a hook receiver 1A formed on the inner surface (see FIG. 6), 2 is an iron lid fitted into the receiving frame 1, and 3 is an L-shape having a weight 3A at the bottom. The lock body. Reference numeral 4 denotes a rotating shaft that projects horizontally (parallel to the iron lid 1) on both side surfaces of the upper portion of the lock body 3. The rotating shaft 4 is rotatably fitted in a pair of grooves 5 formed opposite to each other at a lower portion near the periphery of the iron lid 2. As a result, the lock body 3 pivots in a plane that is orthogonal to the iron lid 2. An extraction preventing bolt 6 is inserted into the entrance of the groove 5 so that the rotary shaft 4 does not come out of the groove 5. Reference numeral 7 denotes a hook provided at one end of the lock body 3, which engages with the hook receiver 1 </ b> A of the receiving frame 1 when the iron lid is closed, and locks the iron lid 2.

  When the iron lid is closed, the lock body 3 rotates about the rotation shaft 4 in the direction in which the hook 7 engages with the hook receiver 1A due to the weight of the weight 3A, and at the same time, a small lid 10 (described later) is rotated. Raise to close the fistula. On the other hand, when the iron lid is opened, the lock body 3 rotates in a direction in which the hook 7 is detached from the hook receiver 1A against the weight of the weight 3A around the rotation shaft 4 as the small lid 10 descends. Reference numeral 8 denotes an arm projecting from the lock body 3 on the hook 5 side. The arm 8 is rotatably engaged with a groove 10B (described later) formed in the small lid 10 on both ends of the arm 8. A shaft 8A is formed.

  Reference numeral 9 denotes a hand fist hole formed in the iron lid 2 corresponding to the mounting position of the lock body 3. Reference numeral 10 denotes a small lid for closing the hand fistula 9 having a weight 10A at the bottom. A groove 10C is formed in the central portion of the small lid 10, and the engagement shaft 8A of the lock body 3 is inserted into the groove 10C, whereby the small lid 10 is rotatably attached to the lock body 3. ing. The small lid 10 is guided by guide means 11 described later when the iron lid is opened and closed.

  Reference numeral 11 denotes guide means for guiding the raising and lowering of the small lid 10. The guide means 11 is composed of protrusions 12 formed on both side surfaces of the small lid 10 and guide grooves 13 formed in the hand fist hole 9 portion of the iron lid 2. As shown in FIG. 1, a stopper 12 </ b> A is formed at the upper part of the protrusion 12, and a stopper receiver 13 </ b> A for receiving the stopper 12 </ b> A is formed at the lower part of the guide groove 13.

  The iron lid opening and closing method by the locking device of the present invention configured as described above will be described with reference to the drawings.

  FIG. 6 is a view showing an open / closed state of the iron lid by the locking device of the present invention, (A) is a cross-sectional view showing a state where a handpiece is inserted into a hand fistula hole, and (B) is a view showing a hand fistula hole. Sectional drawing which shows the state which further inserted the handle and unlocked, (C) is sectional drawing which shows the state which pulls up a handle and this and opens an iron lid. In FIG. 6, the same reference numerals as those in FIGS. 1 to 5 denote the same components.

  As shown in FIG. 6A, the U-shaped tip 14A of the hand rod 14 is inserted into the hand rod hole 9, and the small lid 10 is pushed down. When the handle 14 is further pushed down, the lock main body 3 rotates in the counterclockwise direction in FIG. 6B around the rotation shaft 4 as the small lid 10 is lowered, and thereby the hook 7 is disengaged from the hook receiver 1A. The iron cover 2 is unlocked and released. When the lock of the iron lid 2 is released in this way, as shown in FIG. 6 (C), the handle 14 is pulled up and hooked into the handle hole 9. And if the handle 14 is further pulled up, the iron lid 2 will be pry open. This operation can be easily performed based on the lever principle by hooking the protrusion 14B of the hand handle 14 to the receiving frame 1.

  When the small lid 10 is pushed down by the handle 14, the projection 12 of the small lid 10 is guided by the guide groove 13 of the iron lid 2, so that the small lid 10 is smoothly held in a horizontal state without being caught anywhere. To descend. When the small lid 10 is lowered, the stopper 12 </ b> A of the protrusion 12 contacts the stopper receiver 13 </ b> A of the guide groove 13 of the iron lid 2, so that the small lid 10 does not come off from the guide groove 13.

  On the other hand, in order to close the iron lid 2, the iron lid 2 may be fitted into the receiving frame 1 as it is. When the iron lid 2 is fitted into the receiving frame 1, the lock body 3 naturally rotates counterclockwise when its lower surface hits the upper surface of the receiving frame 1, and then the weight 3A is closed when the iron lid 2 is closed. , And the hook 7 engages with the hook receiver 1A. At the same time, the small lid 10 is lifted by the lock body 3, and the hand fist hole 9 is automatically closed. Since the upper surface of the small lid 10 is slightly lower than the upper surface of the iron lid 2, even if a car or the like passes over the hand hole 9, the small lid 10 is pushed down and the hook 7 is detached from the hook receiver 1A and locked. There is no fear of being released.

  When the small lid 10 is pushed up by the lock body 3, the projection 12 of the small lid 10 is guided by the guide groove 13 of the iron lid 2, so that the small lid 10 is smoothly held in a horizontal state without being caught anywhere. To rise.

  In this way, by providing the guide means 11 for guiding the raising and lowering of the small lid 10 that closes the hand fist hole 9 formed in the iron lid 2, the small lid 10 is smoothly caught without being caught anywhere when the iron lid is opened and closed. Go up and down.

  The above is an example in which the guide means 11 of the small lid 10 is configured by the protrusion 12 formed on the small lid 10 and the guide groove 13 formed on the iron lid 2. 2 and a protrusion formed on the small lid 10 that moves up and down along the protrusion, but may be constituted by a guide groove. In this case, a stopper for preventing the small lid 10 from being detached is formed in the upper part of the guide groove, and a stopper receiver for receiving the stopper is formed in the lower part of the projection.

  When the iron lid 2 is closed, the lock body 3 rotates in the locking direction due to its own weight 3A. In order to ensure this rotation, as shown in FIG. A spring 15 that applies a rotational force in a direction in which the hook 7 engages with the hook receiver 1A to the lock body 3 may be attached.

It is an assembly perspective view of the small lid and lock body of the locking device of this invention. It is a fragmentary sectional view which shows the iron cover of the locking device of this invention. FIG. 3 is a view in the A direction of FIG. 2. It is sectional drawing which shows the state which attached the small cover and lock main body of the locking device of this invention to the iron cover. It is a B direction view of FIG. It is a figure which shows the open / closed state of the iron lid by the locking device of this invention, (A) is sectional drawing which shows the state which inserted the hand guard into the hand fistula hole, (B) Sectional drawing which shows the state which inserted and cancel | released locking, (C) is sectional drawing which shows the state which pulls up a handle and this and opens an iron lid. It is sectional drawing which shows the state by which the iron cover was locked by the conventional locking device. It is an assembly perspective view which shows a conventional locking device. It is a figure which shows the open / closed state of the iron lid by a conventional locking device, (A) is sectional drawing which shows the state which inserted the handclaw in the hand fistula, (B) is 90 g of the hand fist inserted in the hand fistula. A cross-sectional view showing a state in which it is rotated, (C) is a cross-sectional view showing a state in which the iron lid is lifted by pulling up the handle.

Explanation of symbols

1: receiving frame 1A: hook receiving 2: iron lid 3: lock body 3A: weight 4: rotating shaft 5: groove 6: extraction preventing bolt 7: hook 8: arm 8A: engaging shaft 9: hand hole 10: small Lid 10A: Weight 10B: Groove 11: Guide means 12: Protrusion 12A: Stopper 13: Guide groove 13A: Stopper receiver 14: Hand handle 14A: U-shaped tip 14B: Protrusion 15: Spring 21: Receiving frame 21A: Hook receiver 22: Iron cover 23: Lock body 23A: Weight 24: Rotating shaft 25: Groove 26: Pull-out prevention bolt 27: Hook 28: Stopper 29: Arm 29A: Engagement shaft 30: Hand hole 30A: Step portion 31: Small lid 31A : Weight 31B: Groove 32: Hand hook 32A: T-shaped tip

Claims (5)

A lock main body rotatably attached to a lower part of an iron lid fitted in a receiving frame, a hand fist hole formed in the iron lid, and a hand fist hole rotatably attached to the lock main body. The lock main body includes a small lid for closing and a hook receiver formed on the receiving frame, and the lock main body has a hook that engages with the hook receiver, and when the iron lid is closed, the lock main body is connected to the iron lid. The hook pivots about the shaft support in a direction to engage the hook receiver, and the small lid is raised to close the hand fistula so that when the iron lid is opened, the lock body is In the locking device for the manhole iron cover, the hook is rotated in a direction to be detached from the hook receiver with the shaft support portion as a lowering,
Guide means for guiding the raising and lowering of the small lid, the guide means comprising a projection formed on the small lid and a guide groove formed on the iron lid for raising and lowering the projection. An iron lid locking device for manholes. A lock main body rotatably attached to a lower part of an iron lid fitted in a receiving frame, a hand fist hole formed in the iron lid, and a hand fist hole rotatably attached to the lock main body. The lock main body includes a small lid for closing and a hook receiver formed on the receiving frame, and the lock main body has a hook that engages with the hook receiver, and when the iron lid is closed, the lock main body is connected to the iron lid. The hook pivots about the shaft support in a direction to engage the hook receiver, and the small lid is raised to close the hand fistula so that when the iron lid is opened, the lock body is In the locking device for the manhole iron cover, the hook is rotated in a direction to be detached from the hook receiver with the shaft support portion as a lowering,
Guide means for guiding the raising and lowering of the small lid, the guide means comprising a protrusion formed on the iron lid and a guide groove that moves up and down along the protrusion formed on the small lid. An iron lid locking device for manholes, characterized in that.   The locking device for an iron lid for a manhole according to claim 1, wherein a stopper is formed on an upper part of the protrusion, and a stopper receiver for receiving the stopper is formed on a lower part of the guide groove. .   The locking device for an iron lid for a manhole according to claim 2, wherein a stopper is formed on the upper part of the guide groove, and a stopper receiver for receiving the stopper is formed on the lower part of the protrusion. .   5. The manhole iron according to claim 1, further comprising a spring that applies a rotational force in a direction in which the hook engages with the hook receiver to the lock body. 6. Lid locking device.

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