JP3142803U - Groove cover anti-theft device - Google Patents

Abstract

A groove lid anti-theft device is provided which is simple for various groove lids such as gratings and lids and realizes perfect anti-theft at low cost.
A shackle body 1a having a through-hole 11a at one end of a U-shaped lock rod 10 and a female thread 12a at the other end, and a male thread 15a screwed into the female thread. A metal shackle 1 provided with a mounting bolt 1b in which a provided bolt shaft 15 extends from a bolt head 16 via a constricted portion 17, and a chain in which one end side is connected to the shackle and the other end side is connected to an anchor. 4 and the bolt shaft 15 of the mounting bolt 15 is inserted into the through-hole 11a of the shackle body 1a fitted so as to straddle the latching bar fixed at both ends to the groove lid, and the bolt shaft The screw head 15a is screwed onto the female screw portion 12a, the locking bar and the shackle 1 are connected, and the bolt head 16 is tightened to tighten the bolt head 16 from the mounting bolt 1b. It was to be.
[Selection] Figure 1

Description

  The present invention relates to a theft prevention device for a groove lid disposed in a side groove or the like.

  From the viewpoint of drainage and strength, a groove cover made of metal grating is generally used for a side gutter (rainwater ditch) of a road. Groove lids, which are metal lids, are also used in catchment basins. Furthermore, in pits, there is a groove lid formed of a steel plate such as a striped steel plate. Since both groove lids are made of metal, news of theft damage has been reported throughout the country as the price of metals has soared. If the grating is stolen, the vehicle falls into the side groove or pit of the top opening, leading to a traffic accident or a child accident, and there is an increasing demand for prevention of theft from the viewpoint of safety. Several antitheft devices for groove lids have been proposed so far (for example, Patent Document 1).

Japanese Utility Model Publication No. 62-110378

  However, the anti-theft device of Patent Document 1 is fastened with fixing bolts of general-purpose bolts and nuts. If the thief has a commercially available spanner or the like, the groove lid may be easily removed and theft may be damaged. Some anti-theft devices use shackles instead of bolts and nuts. Even these shackles consisted of a U-shaped main body and general-purpose bolts or pins. Even when the groove lid was connected to the side groove body with a chain or the like, the groove lid was easily carried away using a general tool.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a groove cover anti-theft device that realizes perfect anti-theft at a low cost in a simple manner with respect to various groove covers such as gratings and lids. With the goal.

In order to achieve the above object, the gist of the invention described in claim 1 is that a lock hole (10a) formed in a U-shape is provided with a through hole (11a) at one end and a female screw portion (12a) at the other end. ) And a bolt shaft (15) provided with a male screw part (15a) screwed to the female screw part are extended from the bolt head (16) via a constricted part (17). A metal shackle (1) having a mounting bolt (1b) and a chain (4) having one end connected to the shackle and the other end connected to an anchor (3), both ends of which are groove lids. The bolt shaft (15) of the mounting bolt (15) is inserted into the through hole (11a) of the shackle body (1a) fitted so as to straddle the latching bar (79) fixed to (7). And, the male thread part (15a) of the bolt shaft is screwed to the female thread part (12a), the locking bar (79) and the shackle (1) are connected, and the bolt head part (16) is further tightened. The constricted part (17) The groove lid antitheft device is characterized in that the head (16) is torn off from the mounting bolt (1b).
The anti-theft device for the groove lid according to claim 2 is the anti-theft device for the groove lid according to claim 1, wherein the pair of legs (2a) are opposed to each other and both upper ends are connected by the top plate (2b) to form a substantially U-shape in side view. And mounting brackets (2) each provided with a through hole (21) near the lower ends of both leg portions (2a), and a latch bar for one main member (72) related to the groove lid (7) ( 79) The through hole (11a) of the shackle body (1a) and the female threaded portion (12a) are overlapped from the outside to the part of the both through holes (21) of the mounting bracket (2) inserted so as to straddle over The bolt shaft (15) of the mounting bolt (1b) is inserted into the through hole (11a) and the through holes (21), and the male screw portion (15a) of the bolt shaft (15a) is inserted into the female screw. The locking bar (79) and the shackle (1) are connected to each other by screwing to the portion (12a) via the mounting bracket.
The anti-theft device for a groove lid according to claim 3 is the anti-theft device according to claim 1 or 2, wherein the anchor (3) forms an annular body (31) on the proximal end side of the shaft-shaped main body (30) and the chain (4 ) And the base end forming the annular body is welded and fixed to the starting portion of the annular body.

  The groove lid anti-theft device of the present invention makes it extremely difficult to remove the groove lid once it is attached to the groove lid for various groove lids such as gratings and jar lids. To do.

The groove lid anti-theft device (hereinafter simply referred to as “the anti-theft device”) according to the present invention will be described in detail below.
1 to 11 show one embodiment of the anti-theft device of the present invention, FIG. 1 is an exploded perspective view of each component related to the anti-theft device of Embodiment 1, and FIG. 2 is a groove for grating the anti-theft device of FIG. 3 is a partial perspective view of the intermediate stage of attachment to the lid, FIG. 3 is a partial perspective view of the bolt head removed from the attachment bolt of FIG. 2 and the anti-theft device has been installed, and FIG. 4 is applied to the groove lid of the water collecting bowl. 5 is an exploded perspective view of the anti-theft device, FIG. 5 is a partial longitudinal sectional view of a state in which the anti-theft device has been attached to the groove cover of FIG. 4, and FIG. FIG. 7 is a perspective view of the groove lid of FIG. 6 and the antitheft device viewed from the back side, FIG. 8 is a perspective view of a mounting bracket according to the antitheft device of Embodiment 2, and FIG. 9 is different from FIG. FIG. 10 is a perspective view of the mounting bracket of the embodiment, FIG. 10 is a theft prevention device in which the mounting bracket of FIG. 8 is added to the antitheft device of FIG. The device, in partial perspective view in the middle step of attaching to the groove closure, is another form view corresponding to FIG. FIG. 11 is a partial perspective view showing a state in which the bolt head is torn off from the mounting bolt of FIG.

(1) Embodiment 1
The antitheft device includes a shackle 1, an anchor 3, and a chain 4.
The shackle 1 comprises a metal shackle body 1a and mounting bolts 1b (FIG. 1). As shown in the figure, the shackle body 1a is formed into a disk portion in which both end portions 11 and 12 of a U-shaped lock rod 10 are swollen. A through hole 11a is provided in one end portion 11 of the disk portion of the U-shaped lock bowl, while a female screw portion 12a is provided in the disk portion of the other end portion 12 so as to face the through hole 11a.

The mounting bolt 1b is a metal bolt in which a bolt shaft 15 provided with a male screw portion 15a that is screwed into the female screw portion 12a is extended from a bolt head 16 via a constricted portion 17. The bolt shaft 15 related to the mounting bolt 1b is inserted from the through hole 11a side, the male screw portion 15a is screwed into the female screw portion 12a, and the U-shaped opening side of the lock rod 10 is closed to form a connecting bracket. The head 16 of the mounting bolt 1b is provided with an engaging portion 16b that is easy to turn the mounting bolt 1b using a tool or hand. Here, a tongue-like engagement portion 16b is formed which is easily pinched by a hand, a spanner, a pliers or the like to turn the mounting bolt 1b. The engaging portion 16b may have a prismatic shape that fits into a spanner.
A bolt shaft 15 extends from the bolt head 16, and a constricted portion 17 is formed at the base of the bolt head 16. In the present embodiment, the base of the bolt head 16 is narrowed to form a constricted portion 17 to be connected to the flange 18, and the bolt shaft 15 extends from the flange. The axial centers of the bolt head portion 16, the constricted portion 17, the flange portion 18, and the bolt shaft 15 coincide as shown in FIG. 1, and a male screw portion 15a is formed on the bolt shaft 15 (here, the tip portion thereof). When the mounting bolt 1b is inserted through the through hole 11a and the female screw portion 12a as shown by the chain line in FIG. 1, the male screw portion 15a can be screwed into the female screw portion 12a as shown in FIG. The axial length of the bolt shaft 15 is set to be equal to or slightly longer than the distance between the through hole 11a and the female screw portion 12a. Reference numeral 16c denotes a hole provided in the engaging portion 16b.

  The anchor 3 is a metal member for fixing the chain 4 to the side groove 9. The anchor 3 is connected to the chain 4 on the proximal end side, the distal end side of the anchor 3 is embedded in a concrete side groove 9 and the like, and the chain 4 is fixed to the side groove 9 via the anchor 3. An L-shaped hook-shaped portion 30 f is formed on the tip end side of the anchor 3 to facilitate fixing to the side groove 9. The anchor 3 is formed with an annular body 31 on the proximal end side of the shaft-shaped main body 30 and connected to the chain 4, and the proximal end on which the annular body 31 is formed is fixed by welding to the starting point of the annular body. Reference numeral 31a indicates the welded portion. The chain 4 is not cut off at this site, and anti-theft measures are taken.

  Chain 4 is a rope made by joining metal rings. Here, the chain 4 has one end connected to the shackle 1 and the other end connected to the anchor 3. The proximal ring 41 of the chain 4 is passed through when the annular body 31 of the anchor 3 is formed, and the proximal ring 41 and the annular body 31 are connected. The tip ring 42 is passed through the mounting bolt 1b when the mounting bolt 1b is assembled to the shackle body 1a, and the tip ring 42 and the shackle 1 are connected. In addition, the chain 4 is covered with the groove 9 that is connected to the shackle 1 with the anti-theft device in which the shaft-like main body 30 of the anchor 3 is fixed to the groove 9 and is covered. It has a length that allows the groove lid 7 to be removed and placed on the side groove 9 side.

The groove lid 7 applied to the antitheft device includes a metal grating 7a as shown in FIG. The grating 7 a is a rectangular plate having a standardized overall shape, and includes a main member 72, a connecting material 73, a side plate 70, and an end plate 71. A main member 72 made of a large number of metal strips and a connecting member 73 orthogonal to the main member 72 are formed in a lattice shape, and both side surfaces thereof are surrounded by side plates 70. The both ends of the main member 72 are used as end plates 71 to form a rectangular plate. The connecting member 73 is also called a cross bar, and is composed of a twisted bar in which a metal bar is twisted. The connecting members 73 are placed on the upper surface of the main member 72 while maintaining a state in which a plurality of main members 72 are vertically erected in the band width direction and arranged at a predetermined pitch, and are spaced apart from each other by a predetermined interval. The Thereafter, the main member 72 and the connecting member 73 are assembled into a rectangular board having a grid shape by electric pressure contact fixing. Symbol SL indicates a slit. In addition, although I bar | burr is normally used for the main member 72, each figure is simply illustrated with a flat bar | burr. The grating 7 a is disposed so as to cover the upper surface opening of the side groove 9. Reference numeral 90 denotes a bottom portion of the side groove 9, reference numeral 91 denotes a side portion of the side groove 9, and reference numeral 92 denotes a running water groove.
In the present invention, a shaft-like metal latching bar 79 is fixed to the opposing main members 72, 72 forming one slit SL of the grating 7a. Both ends of the latching bar 79 are fixed to the lower edges of the opposed main members 72, 72 constituting the groove lid 7, and the latching bar is provided so as to cross the slit SL as shown in FIG.

The anti-theft device uses the above-described components to attach the mounting bolts to the through holes 11a of the shackle body 1a fitted from the upper side so as to straddle the latching bars 79 fixed to the groove lid 7 at both ends. The bolt shaft 15 of 1b is inserted, and the male screw portion 15a of the bolt shaft 15 is screwed to the female screw portion 12a to connect the latching bar 79 and the shackle 1 as shown in FIG. The shackle 1 is connected to one end side ring 42 of the chain 4, the other end side base ring 41 of the chain 4 is connected to the anchor 3 fixed to the side groove 9, and the groove lid 7 is connected via the shackle 1. The chain 4 is fixed to the side groove 9.
The anti-theft device is configured such that when the bolt head 16 is further tightened from the state shown in FIG. 2, the bolt head 16 is removed from the mounting bolt 1b by the constricted portion 17 as shown in FIG. By removing the bolt head 16 from the mounting bolt 1b, the mounting bolt 1b can no longer be removed from the shackle body 1a. Since there is no bolt head 16, a tool such as a spanner cannot be used, and complete prevention can be achieved.

Next, an example in which the antitheft device is attached to the side groove 9 using each of the above components will be described.
The base end ring 41 of the chain 4 is connected to the ring body 31 of the anchor 3, and the base end of the ring body 31 is welded and fixed to the starting point of the ring body 31. Further, the shaft-shaped main body 30 portion having the flange-shaped portion 30f of the anchor 3 is embedded and fixed to the side portion 91 near the step portion 91a of the side groove 9 installed in the field (FIG. 2).
Subsequently, the shackle body 1a is fitted so as to straddle the latching bar 79 fixed to the groove lid 7 that covers the upper surface opening of the side groove 9. Thereafter, the bolt shaft 15 of the mounting bolt 1b is inserted into the through-hole 11a, and then passed through the end ring 42 of the chain 4, and the male screw portion 15a of the bolt shaft 15 is screwed to the female screw portion 12a for latching. The bar 79 and the chain 4 are connected by the shackle 1. Further, the bolt head 16 is removed from the mounting bolt 1b by the constricted portion 17 by tightening the bolt head 16 in the direction of the arrow in the circle in FIG. 2 (FIG. 3). Thus, the hooking bar 79, the shackle 1, the chain 4, and the anchor 3 are connected by passing the tip ring 42 through the mounting bolt 1b. Since the latching bar 79 is fixed to the groove lid 7 and the anchor 3 is embedded and fixed in the side groove 9, the groove lid 7 is connected to the side groove 9 by the chain 4. The attachment of the groove lid 7 to the side groove 9 by the antitheft device is completed.

Regarding the groove lid 7, not only the grating 7a but also various ones can be used. For example, a groove lid 7 as shown in FIGS. FIG. 4 is a perspective view of the anti-theft device applied to the groove lid 7 of another embodiment as the water collecting lid 7b. This drainage lid 7b has substantially the same basic structure as the grating 7a of the rectangular plate in FIG. 1, and is formed in a lattice shape with a main member 72 and a connecting member 73 orthogonal thereto, and both side surfaces thereof are side plates 70. Surround with. Both ends of the main member 72 are square plates with end plates 71. A shaft-shaped metal latching bar 79 is fixed to the opposing main members 72 and 72 forming one slit SL of the water collecting lid 7b. Both ends of the latching bar 79 are fixed to the opposing main members 72, 72 constituting the groove lid 7, and the latching bar 79 is provided so as to cross the slit SL as shown in FIG.
The antitheft device inserts the bolt shaft 15 of the mounting bolt 1b into the through hole 11a of the shackle body 1a inserted so as to straddle the latching bar 79, as in FIGS. The bolt shaft is passed through the chain end ring 42, and the male thread portion 15 a of the bolt shaft 15 is screwed to the female thread portion 12 a to connect the latching bar 79 and the shackle 1. The latching bar 79 is connected to one end side of the chain 4 through the shackle 1, and the other end side of the chain 4 is connected to the anchor 3 fixed to the side groove 9, so that the lid 7 is connected to the shackle 1. The chain 4 is fixed to the side groove 9. Then, by tightening the bolt head 16, the bolt head 16 is torn off from the mounting bolt 1b at the constricted portion 17 as shown in FIG.

The groove lid 7 may be another embodiment as shown in FIGS. 6 and 7 are perspective views of the groove lid 7 which is a steel plate lid 7c used in a pit or the like. The steel plate lid 7c has a lid body formed of a plate-like lid 75 such as a striped steel plate, and a frame member 76 fitted in the pit is fixed to the back surface 75b. Reference numeral 77 denotes a handle for lifting the steel plate lid 7c, and reference numeral 77a denotes a handle stopper provided on the back surface side.
In this antitheft device, one end of the latching bar 79 is fixed to the frame member 76 of the steel plate lid 7c, and the other end of the latching bar 79 is fixed to the back surface 75b of the plate-like lid 75 in the frame member. The shackle body 1a is set so as to be able to be fitted over the hooking bar. After that, as in FIGS. 1 to 3, 4, and 5, the mounting bolt 1 b is inserted into the through hole 21 of the shackle body 1 a and the end ring 42 of the chain 4 fitted into the latching bar 79. The shaft 15 is screwed onto the female threaded portion 12a, and the latching bar 79 and the chain 4 are connected by the shackle 1. Further, the bolt head 16 is removed from the mounting bolt 1b at the constricted portion 17 by tightening the bolt head 16.

The anti-theft device configured in this manner inserts the shackle body 1a so as to straddle the latching bar 79, passes the bolt shaft 15 of the mounting bolt 1b through the through hole 11a and the tip ring 42 of the chain 4, and After the male screw portion 15a of the bolt shaft 15 is screwed to the female screw portion 12a and the latching bar 79, the shackle 1, and the chain 4 are connected, the bolt head portion 16 is tightened and the bolt head portion 16 is attached by the constricted portion 17. Since it is torn off from the bolt 1b, once the hooking bar 79, the shackle 1, and the chain 4 are connected, it is difficult to remove. Since the bolt head 16 is formed with the constricted portion 17, the bolt head 16 can be easily scraped off and has excellent workability. Since the bolt head 16 is torn off, there is no place to grip the bolt shaft 15 even if a tool or the like is used. Therefore, in this antitheft device, if the base end ring 41 on the other end side of the chain 4 is attached to the anchor 3 and the anchor 3 is fixed to the side groove 9, there is no possibility that the groove cover 7 will be damaged. Even the administrator cannot remove the groove lid 7. Unlike the conventional product, which is fastened with a general-purpose bolt or the like and the groove lid 7 is easily removed by a commercially available spanner or the like, the anti-theft measures are perfect.
Of course, it is difficult for the administrator to remove the groove lid 7 by removing the mounting bolt 1b from the shackle body 1a, but there is no problem. The groove lid 7 that covers the side groove 9 is periodically removed by cleaning or the like in the side groove 9, but the groove lid 7 is usually placed beside the side groove 9. It is sufficient to secure the length of the chain 4 so that it can be placed beside the side groove 9.
Further, as described above, the anti-theft device can cope with a low cost with a very simple configuration including the shackle 1, the anchor 3, and the chain 4. The anti-theft device is also attached to the groove lid 7 by inserting the shackle body 1a so that both ends of the anti-theft bar 79 are fixed to the groove lid 7 and then screwing the mounting bolts on the shackle body 1a. The bolt head 16 is peeled off and tightened, and the anchor 3 connected to the proximal ring 41 via the shackle 1 and the chain 4 is simply fixed to the side groove 9, so that much effort and time are not required for the attachment. Moreover, perfect theft prevention can be realized for various groove lids 7 such as the grating 7a and the water collecting lid 7b, which is extremely useful.
Further, the anchor 3 forms an annular body 31 on the proximal end side of the shaft-shaped main body 30 and is connected to the chain 4, and the proximal end forming the annular body 31 is welded and fixed to the starting portion of the annular body 31. For example, the problem that the groove lid 7 is removed by being separated from the annular body 31 of the anchor 3 is solved, and the anti-theft measure is a stone.

(2) Embodiment 2
As shown in FIGS. 8 to 11, the anti-theft device adds a mounting bracket 2 to the anti-theft device of FIGS. 1 to 7 as a component. FIG. 8 shows a mounting bracket 2 as an auxiliary part added to the antitheft device of FIGS.
In the grating 7a and the water collecting lid 7b, both ends of the latching bar 79 are fixed to the opposing main members 72, 72 constituting the groove lid 7, and the latching bar 79 is provided so as to cross the slit SL. . Here, if one main member 72 is to carry the latching bar 79, the band width of the main member 72 is too large, and it is difficult to fit the shackle body 1a so as to straddle it. The main member 72 and the shackle 1 cannot be connected. When this one main member 72 is used for the latching bar 79, the main member 72 and the shackle 1 are connected via the mounting bracket 2.

The mounting bracket 2 is a strip piece processed product, and a pair of leg portions 2a are opposed to each other, and both upper ends thereof are connected by a top plate portion 2b so as to be substantially U-shaped in a side view. Near the lower ends of both legs 2a, through holes 21 are provided so as to face each other. Symbol ε is a U-shaped opening gap of the mounting bracket 2, and the gap width is set larger than the thickness of the main member 72. Reference numeral 22 indicates a protrusion that swells inwardly in a U shape, and reference numeral 22a indicates a recess for forming the protrusion.
When the fitting 2 is fitted from the upper side as shown in FIG. 10 with the main member 72 of the grating 7a as the latching bar 79 and straddling it, the portion of the through hole 21 provided in the leg 2a is the main bar 72. Projects downward from the member. In this antitheft device, the through hole 11a and the female threaded portion 12a of the shackle body 1a through which the tip ring 42 has been passed are overlapped with the through holes 21 and 21 from the outside. Furthermore, the bolt shaft 15 of the mounting bolt 1b is inserted into the through hole 11a and the two through holes 21, and the male screw portion 15a of the bolt shaft 15 is screwed to the female screw portion 12a. The slack bar 79 and the shackle 1 are connected. Thereafter, by tightening the bolt head 16, the bolt head 16 is removed from the mounting bolt 1 b at the constricted portion 17 (FIG. 11). Other configurations are the same as those of the antitheft device of FIGS. 1 to 3 indicate the same or corresponding parts.

  The mounting bracket 2 can be, for example, that of FIG. 9 instead of FIG. The mounting bracket 2 of FIG. 8 has a width of the strip plate larger than that of FIG. 7, and is provided with a plurality (three in this case) of through holes 21 obliquely upward from the lower end corner area of each leg portion 2a. Reference numeral 24 denotes a notch. There are various sizes of the grating 7a and the water collecting lid 7b, and the size of the main member 72 differs depending on the size. The mounting bracket 2 of FIG. 9 can cope with the main member 72 having a small size to a large size by selecting the through hole 21 through which the mounting bolt 1b is inserted. The specification range of the groove lid 7 that can be applied with one mounting bracket 2 is expanded.

  In addition to the effects of the first embodiment, the antitheft device configured as described above can use the main member 72 of the grating 7a and the water collecting lid 7b as the latching bar 79 as it is. Since it is not necessary to provide the latching bar 79 for the anti-theft device, the present device can be easily attached to the existing groove lid 7 and the like, and its application range is widened and further useful.

  The present invention is not limited to the one shown in the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, and the like of the shackle 1, the mounting bracket 2, the anchor 3, the chain 4, the groove lid 7, and the side groove 9 can be appropriately selected according to the application.

It is a disassembled perspective view of each component concerning the antitheft device of Embodiment 1. It is a fragmentary perspective view in the middle of attaching the antitheft device of FIG. 1 to the groove lid which is grating. FIG. 3 is a partial perspective view showing a state in which the bolt head is torn off from the mounting bolt of FIG. It is a disassembled perspective view of the anti-theft device applied to the ditch cover of a catchment. FIG. 5 is a partial longitudinal sectional view of a state in which the antitheft device has been attached to the groove lid of FIG. 4. It is the perspective view seen from the front side of the groove lid which is a steel plate lid applied to pits. FIG. 7 is a perspective view of the groove lid and the antitheft device of FIG. 6 as viewed from the back side. It is a perspective view of the attachment metal fitting concerning the antitheft device of Embodiment 2. It is a perspective view of the attachment metal fitting of another aspect from FIG. FIG. 9 is a partial perspective view of the anti-theft device in which the mounting bracket of FIG. 8 is added to the anti-theft device of FIG. FIG. 11 is a partial perspective view showing a state in which the bolt head is torn from the mounting bolt of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shackle 1a Shackle body 1b Mounting bolt 10 Locking rod 11a Through-hole 12a Female thread part 15a Male thread part 2 Mounting bracket 2a Leg part 2b Top plate part 21 Through-hole 3 Anchor 30 Shaft-shaped main body 31 Ring body 4 Chain 7 Groove cover 72 Main member 79 Bar for hanging

Claims (3)

A shackle body (1a) provided with a through hole (11a) at one end of a U-shaped lock rod (10) and a female thread (12a) at the other end is screwed into the female thread. A metal shackle (1) provided with a mounting bolt (1b) in which a bolt shaft (15) provided with a male screw portion (15a) extends from a bolt head (16) via a constricted portion (17),
A chain (4) having one end connected to the shackle and the other end connected to an anchor (3),
Bolt shafts (15) of the mounting bolts (15) are inserted into the through holes (11a) of the shackle body (1a) fitted so as to straddle the latching bars (79) fixed at both ends to the groove lid (7). ) And the male screw portion (15a) of the bolt shaft is screwed to the female screw portion (12a) to connect the locking bar (79) and the shackle (1), and the bolt head ( An antitheft device for a groove lid, wherein the bolt head (16) is torn off from the mounting bolt (1b) at the constricted portion (17) by tightening 16). A pair of legs (2a) are opposed to each other and the upper ends of both are connected by a top plate (2b) to form a substantially U-shape in side view, and through holes (21) are provided near the lower ends of both legs (2a). Further comprising a mounting bracket (2),
The shackle body to the part of the two through holes (21) of the mounting bracket (2) fitted so as to straddle the latching bar (79) of one main member (72) of the groove lid (7) The through hole (11a) of the (1a) and the female screw portion (12a) are overlapped from the outside, and the bolt shaft (15) of the mounting bolt (1b) is connected to the through hole (11a) and the both through holes (21). And the male screw part (15a) of the bolt shaft (15a) is screwed to the female screw part (12a), and the locking bar (79) and the shackle (1) are connected via the mounting bracket. The antitheft device for a groove lid according to claim 1 to be connected. The anchor (3) is connected to the chain (4) by forming an annular body (31) on the proximal end side of the shaft-shaped main body (30), and the proximal end forming the annular body is the starting point of the annular body The antitheft device for a groove lid according to claim 1 or 2, which is welded to the portion.

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