JP3150868U - Manhole cover opening and closing jig - Google Patents

Abstract

An easy-to-use manhole opening / closing jig that prevents a hook portion from being inadvertently detached from a locking hole is provided. An opening / closing jig 11 includes a rod-shaped main body 2 having an operation portion at an upper portion thereof, and a hook portion 4 provided at a lower portion of the main body 2 and inserted into a locking hole 102 of a manhole cover 101. The hook portion 4 inserted into the stop hole 102 is rotated and locked to the lower surface of the manhole cover 101. A lock pin 11 is provided to prevent the hook portion 4 from rotating when locked. The lock pin 11 is loosely inserted into a cylindrical body 12 provided in the main body 2 and is dropped and inserted into the locking hole 102 by its own weight. Since the lock pin 11 prevents the hook portion 4 from rotating while the hook portion 4 is locked, the manhole cover 101 can be opened and closed without the hook portion 4 being removed from the locking hole 102. [Selection] Figure 1

Description

  The present invention relates to a manhole cover opening / closing jig that opens and closes a manhole cover, and in particular, includes a hook portion that is inserted into a locking hole of the manhole cover, and the hook portion inserted into the locking hole is rotated to rotate the manhole cover. The present invention relates to an opening / closing jig for a manhole cover to be locked to a lower surface.

  It is generally adopted that a manhole cover provided on a road is taper-fitted into a receiving frame so that the vehicle traveling on the manhole does not rattle and generate noise.

  Since such a manhole cover is taper-fitted to the receiving frame, the manhole cover bites into the receiving frame due to traveling of the vehicle and the like and cannot be easily opened. Therefore, an opening / closing jig that locks in the locking hole of the manhole cover is used.

  As an example of a conventional opening / closing jig, an opening / closing jig (for example, Patent Document 1) in which a substantially T-shaped hook portion is provided at the tip of a rod-like main body is known, and the hook portion is inserted into a locking hole of a manhole cover. By operating the rod-shaped main body and rotating the hook portion horizontally by 90 degrees, the hook portion is locked to the lower surface of the locking hole, and is prevented from coming off, and the manhole cover is opened and closed using an opening / closing jig. After opening and closing, the hook part can be pulled out from the locking hole by rotating 90 degrees horizontally.

  By the way, the manhole cover has a round or square shape, and the locking holes provided in the manhole cover have some differences in number and size, but the shape is the same as the substantially elongated hole shape. Yes. In addition to a general manhole cover provided with an anti-theft chain, there are various types such as a single-open manhole cover provided with a hinge and a manhole cover which is opened horizontally after being lifted.

  In particular, in a manhole cover with a hinge that is provided with a hinge or a manhole cover that opens horizontally after being lifted, the hook part is not locked to the locking hole. There is a possibility that the hook part may come off.

  As shown in FIG. 7A, the conventional opening / closing jig is provided with a rod-like body at the lower portion of the operation portion, a hook portion 201 is provided at the tip of the rod-like body, and an upper end 202 of the hook portion is a manhole cover. Although the structure was in close contact with the lower surface (not shown), as shown in FIG. 7B, the angle becomes shallow due to wear over time, and the catch becomes weak. May occur, the manhole or the hook portion turns, and the hook portion may come off from the locking hole.

Japanese Utility Model Publication No. 6-87439

  Therefore, the present invention solves the above-mentioned problems, and has an ease of use equal to or higher than that of the prior art, prevents the hook part from being inadvertently detached from the locking hole, and provides an easy-to-use manhole opening / closing jig. The purpose is to provide.

  The device according to claim 1 is provided with a hook-shaped main body having an operation part at the upper part and a hook part provided at a lower part of the main body and inserted into a locking hole of a manhole cover, and the hook inserted into the locking hole In a manhole cover opening / closing jig that rotates the portion and engages with the lower surface of the manhole cover, the manhole cover includes an anti-rotation means that engages with the manhole cover and prevents the hook portion from being rotated. To do.

  The invention of claim 2 is characterized in that the anti-rotation means is a lock pin inserted into the locking hole, and a cylindrical body through which the lock pin is inserted is provided in the main body.

  The invention of claim 3 is characterized in that the lock pin is loosely inserted into the cylindrical body so that it can freely fall, and the tip of the lock pin is inserted and locked to one side of the locking hole.

  According to a fourth aspect of the present invention, the locking hole has a long hole shape, and has an enlarged portion that is wider than both sides at the center, the cross-sectional shape of the tip of the main body is substantially circular, The hook portion is formed thinner than the diameter, and the diameter of the tip of the main body is larger than the width on both sides of the locking hole.

  The invention of claim 5 is characterized by comprising a string-like body connecting the upper part on the main body side and the upper part of the lock pin.

  The invention according to claim 6 is characterized in that protrusions that are engaged with the lower surface of the manhole cover are provided on both ends of the upper edge of the hook portion.

  According to the first aspect of the present invention, there is provided a rod-shaped main body having an operation part at the upper part, and a hook part provided at the lower part of the main body and inserted into the locking hole of the manhole cover, and inserted into the locking hole. In the manhole cover opening / closing jig that rotates the hook portion and locks it to the lower surface of the manhole cover, the hook includes a detent means that locks the manhole cover and prevents the hook portion from rotating when locked. Since the anti-rotation member prevents the hook portion from rotating while the portion is locked, the manhole cover can be opened and closed without the hook portion being removed from the locking hole.

  According to the second aspect of the present invention, the lock pin inserted into the cylindrical body is inserted and locked in the locking hole, so that the hook portion is prevented from rotating. By removing the lock pin from the locking hole, the hook is locked. The part can be turned and removed from the locking hole.

  According to the third aspect of the present invention, when the hook portion is inserted into the locking hole and the hook portion is rotated approximately 90 degrees, the hook portion is locked to the lower surface of the manhole cover, and the lock pin is dropped to be engaged. The hook is inserted and locked to one side of the stop hole, and the hook portion automatically stops.

  In addition, according to the invention of claim 4, since the tip of the main body is larger than both sides of the locking hole, the main body does not move in the length direction of the locking hole during locking, and the opening / closing operation can be performed stably. It can be carried out.

  Further, according to the invention of claim 5, by pulling up the string-like body connected to the lock pin, the lock pin can be easily pulled out from the locking hole by hand, thereby releasing the detent state. it can. Moreover, even if the lock pin is removed from the cylinder, the lock pin is not lost due to the string-like body.

  According to the sixth aspect of the present invention, the entire upper edge of the hook portion does not hit the lower surface of the manhole cover, and the protruding portion hits the lower surface at a point, so that wobble is prevented and a reliable locking state is obtained.

1 is a sectional view of a usage state showing Example 1. FIG. FIG. 3 is a plan sectional view of the tip in a non-rotating state. It is a whole perspective view same as the above. It is sectional drawing of the state which aligned the hook part to the locking hole same as the above. It is sectional drawing of the state which inserted the hook part into the locking hole same as the above. FIG. 6A is a front view, and FIG. 6B is a side view. The front view of the hook part of a prior art example is shown, FIG. 7 (A) shows the thing before use, FIG.7 (B) shows the thing after abrasion.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, a new manhole cover opening / closing jig, which is different from the conventional one, is obtained, and the manhole cover opening / closing jig is obtained.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 6 show a first embodiment of the present invention. As shown in FIG. 1, the opening / closing jig 1 of the manhole cover 101 is provided with a lateral operation portion 3 on the upper portion of a main body 2 having a metal bar shape. The hook portion 4 is provided at the lower end of the main body 2, and the tip portion A of the main body 2 has a circular cross section.

  As shown in FIG. 2, the manhole cover 101 has a long hole-shaped locking hole 102, and the locking hole 102 has an enlarged portion 103 larger than both sides at the center thereof.

  The hook portion 4 is formed in a plate shape having a thickness that can be inserted into the locking hole 102, and as shown in FIGS. 4, 5, and 6, the upper edge of the hook portion 4 becomes higher toward both sides. Protrusions 5 and 5 are formed and have an arrow shape. Further, the distal end portion 2A of the main body 2 has a substantially circular cross section, the distal end portion 2A is inserted into the enlarged portion 103, and the diameter D of the distal end portion 2A is formed larger than the thickness t of the hook portion 4. Yes. Further, the diameter D of the distal end portion 2A is larger than the width W on both sides of the locking hole 102.

  Therefore, after inserting the hook portion 4 into the locking hole 103 with the operation portion 3, the hook portion 4 is horizontally rotated about 90 degrees around the main body 2, so that the protruding portions 5, 5 of the hook portion 4 become manholes. The manhole cover 101 can be opened and closed by the operation unit 3 by being locked to the lower surface of the cover 101. By providing the protrusions 5 and 5 that partially protrude from the hook part 4 in this way, the protrusions 5 and 5 hit the lower surface of the manhole cover 101 at points, so that the catch is improved and wobble is prevented. it can.

  In the present invention, in order to prevent the hook portion 4 at the time of locking from being detached from the locking hole 102, a lock pin 11 serving as a detent means is provided, and the cylindrical body 12 through which the lock pin 11 is inserted is connected to the tip of the main body 2. It is provided vertically in the part 2A.

  The lock pin 11 is loosely inserted into the cylindrical body 12 so as to be freely dropped, and a large-diameter head portion 11A is provided on the upper portion of the lock pin 11, and the head portion 11A is engaged with the upper portion of the cylindrical body 12. The lock pin 11 is prevented from falling off. The lock pin 11 is smaller in diameter than the distal end portion 2 </ b> A of the main body 2, and engages with one of the both sides of the locking hole 102.

  Further, the head portion 11A of the lock pin 11 and the operation unit 3 side of the main body 2 are connected by a string-like body 13 such as a wire rope. Accordingly, the lock pin 11 can be removed from the locking hole 102 by operating the string-like body 13 at hand.

  Next, how to use the opening / closing jig 1 will be described. The operator operates the opening / closing jig 1 with the operation unit 3. First, as shown in FIG. 4, the direction of the hook portion 4 is aligned with the locking hole 102, the hook portion 4 is inserted into the locking hole 102, and the distal end of the distal end portion 2 A is inserted into the enlarged portion 103. As a result, the tip of the lock pin 11 comes into contact with the upper surface of the manhole cover 101 as shown in FIG. Thereafter, when the hook portion 4 is rotated approximately 90 degrees, as shown in FIGS. 1 and 2, the hook portion 4 comes to a position where it intersects with the locking hole 102, and the protrusion 5 of the hook portion 4 is formed on the lower surface of the manhole cover 101. , 5 are locked, and at the same time, the tip of the lock pin 11 is dropped and locked to one side of the locking hole 102. As a result, the hook portion 4 is prevented from rotating, and the manhole cover 101 can be opened and closed.

  When the opening / closing operation by the opening / closing jig 1 is finished, the lock pin 11 is lifted from the locking hole 102 by lifting the lock pin 11 using the string-like body 13 near the hand of the operation unit 3, and the rotation is prevented. After that, the hook portion 4 can be turned and pulled out from the locking hole 102.

  As described above, the cylindrical body 12 and the lock pin 11 provide a simple anti-rotation structure, so that the cylindrical body 12 and the lock pin 11 can be manufactured easily and inexpensively, and even conventional open / close jigs can be improved without losing strength.

  As described above, in this embodiment, corresponding to claim 1, a main body 2 having a bar shape having an operation portion 3 at the upper portion, and a hook provided at the lower portion of the main body 2 and inserted into the locking hole 102 of the manhole cover 101. The opening / closing jig 1 of the manhole cover 101 that includes the portion 4 and rotates the hook portion 4 inserted into the locking hole 102 to lock it to the lower surface of the manhole cover 101 is locked to the manhole cover 101. Since the lock pin 11 is provided as a detent means for preventing the hook portion 4 from rotating, the lock pin 11 prevents the hook portion 4 from rotating when the hook portion 4 is locked. The manhole cover 101 can be opened and closed without detaching from the position.

  In this way, in this embodiment, corresponding to claim 2, the detent means is the lock pin 11 inserted into the locking hole 102, and the cylindrical body 12 through which the lock pin 11 is inserted is attached to the main body 2. Since the lock pin 11 inserted into the cylindrical body 12 is inserted and locked in the locking hole 102, the hook portion 4 is prevented from rotating, and when the lock pin 11 is removed from the locking hole 102, the hook portion 4 is locked. Can be removed from the locking hole 102 by turning.

  Thus, in this embodiment, corresponding to claim 3, the lock pin 11 is loosely inserted into the cylindrical body 12 so that it can freely fall, and the tip of the lock pin 11 is inserted and locked to one side of the locking hole 102. Therefore, when the hook portion 4 is inserted into the locking hole 102 and the hook portion 4 is rotated by approximately 90 degrees, the hook portion 4 is locked to the lower surface of the manhole cover 101 and the lock pin 11 is dropped by its own weight. It is inserted and locked to one side of the stop hole 102, and the hook portion 4 is automatically prevented from rotating.

  Thus, in this embodiment, corresponding to claim 4, the locking hole 102 has a long hole shape, and has an enlarged portion 103 wider than both sides in the center, and a cross section of the tip of the main body 2. Since the hook portion 4 is formed thinner than the diameter D of the front end portion 2A of the main body 2 and the diameter D of the main body 2 is larger than the width W on both sides of the locking hole 102, the front end of the main body 2 is engaged. It is larger than both sides of the stop hole 102, so that the main body 2 does not move in the length direction of the stop hole 102 during locking, and the opening / closing operation can be performed stably.

  In this way, in this embodiment, corresponding to claim 5, since the cord-like body 13 that connects the upper part on the main body 2 side and the upper part of the lock pin 11 is provided, the cord-like body 13 connected to the lock pin 11 is provided. By pulling up the lock pin 11, the lock pin 11 can be easily pulled out from the locking hole 102 by hand, thereby releasing the detent state. Further, even if the lock pin 11 is removed from the cylinder 12, the lock pin 11 is not lost by the string-like body 13.

  Further, in this embodiment, in correspondence with the sixth aspect of the present invention, since the protruding portions 5 that are engaged with the lower surface of the manhole cover 101 are provided on both ends of the upper edge of the hook portion 4, the upper edge of the hook portion 4 is provided. Since the projecting portion 5 hits the lower surface at a point without hitting the lower surface of the manhole cover 101 as a whole, wobbling is prevented and a reliable locking state is obtained.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in claims 1 to 3, the shape of the locking hole can be applied to various types. Further, it goes without saying that the present invention can be used for both a conventional opening / closing jig and a newly created opening / closing jig.

  As described above, the manhole cover opening / closing jig according to the present invention is an opening / closing jig used for manhole cover opening / closing work, and provides a manhole cover opening / closing jig with a mechanism that prevents the manhole cover from being detached during the work. Can do.

DESCRIPTION OF SYMBOLS 1 Opening / closing jig | tool 2 Main body 2A Tip part 3 Operation part 4 Hook part 5 Protrusion part 11 Lock pin 11A Head part 12 Cylindrical body 13 String-like body 101 Manhole cover 102 Enlargement part D Diameter t Thickness W Width

Claims (6)

A rod-shaped main body having an operation portion on the upper portion and a hook portion provided at a lower portion of the main body and inserted into a locking hole of a manhole cover, and rotating the hook portion inserted into the locking hole to rotate the manhole An opening / closing jig for a manhole cover to be locked to the lower surface of the cover, comprising: a rotation preventing means for locking to the manhole cover to prevent the hook portion from rotating at the time of locking. . 2. A manhole cover opening / closing jig according to claim 1, wherein the rotation preventing means is a lock pin inserted into the locking hole, and a cylindrical body through which the lock pin is inserted is provided in the main body. 3. The manhole cover opening / closing jig according to claim 2, wherein the lock pin is loosely inserted into the cylindrical body so as to be freely dropped, and a tip of the lock pin is inserted and locked to one side of the locking hole. The locking hole has a long hole shape and has an enlarged portion that is wider than both sides at the center, the cross-sectional shape of the tip of the main body is substantially circular, and the hook portion is thinner than the diameter of the tip of the main body. The opening / closing jig for a manhole cover according to claim 3, wherein the opening / closing jig is formed and has a diameter at a tip of the main body larger than a width of both sides of the locking hole. The manhole cover opening and closing jig according to claim 3 or 4, further comprising a string-like body connecting the upper part on the main body side and the upper part of the lock pin. The manhole cover opening / closing jig according to any one of claims 3 to 5, wherein protrusions that are engaged with the lower surface of the manhole cover are provided on both ends of the upper edge of the hook portion.

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