JP3105760U - Handhole iron lid fall prevention device - Google Patents

Abstract

A fall prevention device that is installed on the handhole 1 so as to straddle it when opening and closing a horizontally long rectangular iron hole 3 for a handhole to prevent the iron hole 3 for a handhole from falling into the handhole. A tool that is light in weight and has excellent workability.
There is provided a plastic lattice frame formed in a horizontally long rectangular shape. Metal bearing bars 6 are attached to the front and rear of the lattice frame 5. In order to restrict the grid frame 5 from being displaced in the left-right direction on the handhole 1, stoppers 7.7 are attached to the left and right central portions of the back surface of the grid frame 5. In order to prevent the lattice frame 5 from being displaced in the front-rear direction on the handhole 1, non-slip members 9 are attached to the left and right ends of the back surface of the lattice frame 5. The handles 10 are attached to the left and right ends of the lattice frame 5.
[Selection] Figure 2

Description

  The present invention relates to a fall prevention device for an iron cover for a hand hole that closes an upper surface of an opening of the hand hole.

  Some handholes with communication cables or the like underground have square openings on the ground. In such a case, when opening and closing the rectangular iron hole for the handhole, the iron cover may be accidentally dropped into the handhole, and the communication cable or the like may be damaged.

  It is known from Patent Document 1 to provide an inner lid for receiving the handhole iron cover below the inside of the iron lid seat that receives the handhole iron cover in order to prevent the handhole iron lid from falling. However, in some existing handholes, it is not possible to further provide an inner lid for preventing falling.

Japanese Utility Model Publication No. 6-23155 (FIG. 1)

  Therefore, the applicant made a rectangular stainless steel lattice frame, and in a state where the one end side of the iron hole for a hand hole was slightly lifted on the hand hole, the lattice frame straddled the upper surface of the opening of the hand hole. Even if the iron cover for the handhole was inadvertently dropped, an attempt was made to catch the iron lid with a lattice frame. However, I learned that this stainless steel grid frame is heavy and difficult to handle.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a handhole iron cover fall prevention device which is designed to reduce the weight of the device in the first place and secure a necessary and sufficient structural strength.

  As shown in FIG. 1, when the iron cover 3 for a rectangular handhole, which is horizontally long, is opened and closed, the present invention according to claim 1 is installed on the upper surface 1a of the opening of the handhole 1 so as to straddle the iron cover. A drop prevention device for preventing the lid 3 from falling into the handhole 1, having a left-right length greater than the front-rear width dimension of the iron hole 3 for a handhole, and a lattice shape formed in a horizontally long rectangle. And a metal bearing bar 6 provided before and after the lattice frame 5 and receiving the load of the iron cover 3 for a hand hole. The lattice frame 5 here includes a plastic molded product entirely formed of a thermoplastic resin or a thermosetting resin. In that case, the bearing bar 6 may be insert-molded integrally with the lattice frame 5. The bearing bar 6 may be only the vertical plate portion 6a of the embodiment, and the upper and lower ends thereof may be flush with the upper and lower ends of the horizontal bar 5a.

  According to a second aspect of the present invention, there is provided the fall prevention device according to the first aspect, wherein the lattice frame is displaced in the left-right direction on the upper surface of the opening of the handhole. A first positioning means for restricting the grid frame 5 from being displaced in the front-rear direction on the upper surface 1a of the opening of the hand hole 1; 2 and a handle 10 provided on at least one of the left and right ends of the lattice frame 5.

  The fall prevention device according to the third aspect of the present invention is mounted as the first positioning means according to the second aspect so as to protrude downward from the left and right central portions of the back surface of the lattice frame 5 as shown in FIGS. As shown in FIGS. 2 and 3, the stopper 7 is attached to the left and right ends of the back surface of the lattice frame 5 as the second positioning means. The non-slip member 9 here may be, for example, a metal plate or a plastic plate whose lower surface is formed in a jagged shape.

  According to a fourth aspect of the present invention, there is provided the fall prevention device according to the third aspect, wherein the lattice frame 5 according to the third aspect includes a number of horizontal bars 5a running in the left-right direction and a number of vertical bars 5b running in the front-rear direction as shown in FIG. It is shaped like a lattice.

  According to a fifth aspect of the present invention, in the drop prevention device, the lattice frame 5 according to the fourth aspect is made of FRP having excellent load resistance.

  According to a sixth aspect of the present invention, there is provided a fall prevention device according to the fourth or fifth aspect, wherein each of the bearing bars 6 according to the fourth or fifth aspect has a vertically long vertical plate portion 6a which is long in the left-right direction as shown in FIGS. And a horizontal plate portion 6b extending horizontally from the upper end in the left-right direction. The vertical plate portion 6a is formed on the outer surface of a horizontal bar 5a located at the front and rear ends of the lattice frame 5. The horizontal plate portion 6b is positioned on the upper surface of the lattice frame 5 in this bolted state.

  In the fall prevention device according to the present invention described in claim 7, each stopper 7 described in claim 4 or 5 is a horizontal fastening plate portion 7 a that is long in the front-rear direction, and extends from the outer end in the left-right direction to the front-rear direction. It is formed of an L-shaped metal plate including a locking plate portion 7b extending downward. It has a stopper 15 for attaching each of the stoppers 7 to the lattice frame 5, the stopper 15 is a substantially U-shaped main body 15a, and a locking part 15b which is bent outward from the front and rear upper ends of the main body 15a. 15b. Then, in a state where the locking portions 15b, 15b of the stopper 15 are hung on the upper ends of the horizontal bars 5a, 5a adjacent to the front and back of the lattice frame 5, the bottom of the main body 15a of the stopper 15 and each stopper 7 are fastened. Each stopper 7 is fastened to the lattice frame 5 via a stopper 15 with a stopper bolt 16 passed between the stopper 7 and the plate portion 7a. In this case, the stop bolt 16 may be of a type in which the stop metal 15 and the stopper 7 are inserted from above between the horizontal bars 5a, and the nut 20 is screwed to the lower end of the stop bolt 16.

  In the fall prevention device according to the present invention described in claim 8, the anti-slip member 9 described in claim 3 is a rubber plate and is attached to the back surface of the lattice frame 5. The attachment type may be fixed with an adhesive, or may be baked or screwed.

  According to a ninth aspect of the present invention, each handle 10 according to the third aspect is formed in a gate shape by bending a metal bar and having legs 10b, 10b at front and rear ends of a handle 10a. Each handle 10 is provided outside the central portion in the front-rear direction of each vertical bar 5b positioned at the left and right ends of the lattice frame 5, and the male screw 21 provided on each of the front and rear legs 10b and the vertical bar 5b. It is fastened by a bolt insertion hole 22 that allows the leg 10b to be inserted, and a nut 23 that is screwed into the male screw 21.

  According to the fall prevention device according to the first aspect of the present invention, almost the entirety is constituted by the plastic lattice frame 5, which greatly reduces the overall weight as compared with the conventional metal form. it can. Specifically, in the case of the fall prevention device of the same shape and the same size, the weight of the stainless steel device is about 12 kg, whereas that of the plastic material of the present invention is approximately 7 kg. Therefore, the drop prevention device can be easily carried, and one end of the iron cover 3 for hand hole is lifted above the hand hole 1, and the grid frame 5 is placed immediately below the iron cover 3 in an inclined position, thereby opening the hand hole 1. The setting work can be performed without any difficulty while straddling the upper surface 1a, and the handleability is excellent. On the other hand, since the metal bearing bar 6 is attached to the front and back of the lattice frame 5, even if the iron hole 3 for hand holes is accidentally dropped, it can be received by the fall prevention device of the present invention and can withstand the strength. An accident in which the iron cover 3 for a hand hole falls into the hand hole 1 can be reliably prevented.

  According to the second aspect of the present invention, in addition to the above, in a state where the grid frame 5 is bridged over the opening upper surface 1a of the handhole 1, the entire grid frame 5 is formed by the first positioning means and the second positioning means. Since the displacement in the left-right direction and the front-back direction is regulated, the opening / closing operation of the iron cover 3 for the handhole can be performed safely. Further, since the handle 10 is provided on at least one of the left and right ends of the lattice frame 5, the drop prevention device of the present invention can be easily moved or set to the work position by using the handle 10.

  According to the third aspect of the present invention, as the first positioning means of the second aspect, the stoppers 7 are attached to the left and right central portions of the back surface of the lattice frame 5, so that the stoppers 7 are provided before and after the iron lid seat 2 at the upper end of the handhole. By locking the stoppers 7 at the opposed inner edges, it is possible to reliably restrict the lattice frame 5 from being displaced in the left-right direction (the front-rear direction of the handhole 1). Furthermore, as the second positioning means of the present invention, since the non-slip members 9 are attached to the left and right ends of the back surface of the lattice frame 5, the non-slip members 9 and 9 are brought into contact with the front and rear of the installation surface of the handhole. Also, the displacement of the lattice frame 5 in the front-rear direction (the left-right direction of the handhole 1) can be restricted, and the grid frame 5 can be used more safely.

  According to the fourth aspect of the present invention, the lattice frame 5 of the third aspect is formed in a lattice shape by a number of horizontal bars 5a running in the left-right direction and a number of vertical bars 5b running in the front-rear direction. Even if it is handled roughly, the lattice frame 5 itself can be reinforced by the vertical and horizontal bar members while being lightweight and firm.

  According to the fifth aspect of the present invention, since the grid frame 5 of the fourth aspect is made of FRP especially among plastic materials, the grid frame 5 can well bear the load of the iron cover 3 for a handhole.

  According to the present invention described in claim 6, in addition to claims 4 and 5, the bearing bar 6 is bolted to the outer surface of the horizontal bar 5a located at the front and rear ends of the lattice frame 5 so as to fit in the left-right direction. Since it is only necessary to simply attach the metal plate bearing bar 6 to the plastic lattice frame 5, it is easy to manufacture the fall prevention device of the present invention while using a combination of different materials. In particular, when the bearing bar 6 is attached to the lattice frame 5, the horizontal plate portion 6b of the bearing bar 6 is located on the upper surface of the lattice frame 5, so that the lifted iron cover 3 for the handhole is placed on the lattice frame 5. When the iron cover 3 is placed on the top, it is partially supported by the horizontal plate portion 6b, so that the operation of turning or sliding the entire iron cover 3 in the horizontal direction can be performed without resistance. Therefore, the worker can open and close the handhole iron cover 3 without much labor.

  According to the present invention, the stoppers 15 are dropped between the horizontal bars 5a adjacent to the front and back of the lattice frame 5, and the stoppers 7 are stopped from the lower surface side of the lattice frame 5. 15, the stopper bolt 16 is passed through the fastening plate portion 7a of the stopper 7 and the bottom of the U-shaped main body portion 15a of the stopper 15, so that the L-shaped metal plate stopper 7 is inserted into the plastic lattice frame 5. Can be easily bolted and retrofitted. Moreover, since the position of the stopper 15 can be adjusted by moving the stopper 15 in the left-right direction between the horizontal bars 5a of the lattice frame 5, even if the distance between the front and rear opposing edges of the iron lid seat 2 is different, it can be used on site. The position of the left and right stoppers 7 can be finely adjusted to cope with this.

  According to the present invention, since the non-slip member 9 is attached to the back surface of the lattice frame 5 using a rubber plate, the addition of the non-slip member 9 does not greatly increase the overall weight. As shown in FIG. 3, the anti-slip member 9 frictionally engages with the road surface 26, and the grid frame 5 is reliably displaced in the front-rear direction (left and right directions of the handhole) regardless of the unevenness of the road surface 26. it can.

  According to the ninth aspect of the present invention, the gate-shaped handle 10 made of a metal bar can be easily attached to the left and right ends of the lattice frame 5, and the handle 10 can be used as a hand to easily mount the fall prevention device of the present invention. Because it can be carried, it can be set to the previous working position.

  In FIG. 1, reference numeral 1 denotes a handhole through a communication cable underground. The upper surface 1a of the opening of the handhole 1 faces a ground surface (generally a sidewalk), and is defined by an iron lid seat 2 installed at the upper end of the handhole 1 in a horizontally long rectangular shape. The upper surface 1a of the opening of the handhole 1 is closed openably and closably by the iron cover 3 for the handhole. The iron cover 3 for a hand hole is formed in a rectangular shape that is horizontally long in the left and right direction, and is detachably attached to the iron lid seat 2 from above.

  In FIG. 2, the fall prevention device of the present invention includes a pair of front and rear metal bearing bars 6, a pair of left and right metal handles 10, a total of four metal stoppers 7 on a lattice frame 5 formed in a horizontally long rectangular shape. A pair of left and right anti-slip members 9 are respectively attached.

  The lattice frame 5 is a plastic molded product in which a large number of horizontal bars 5a running in the left-right direction and a large number of vertical bars 5b running in the front-rear direction are tangled vertically and horizontally. Specifically, the lattice frame 5 is made of FRP having excellent load resistance. . Nineteen horizontal bars 5a are arranged at equal pitches between the front and rear, and seven vertical bars 5b are arranged at equal pitches between the left and right. Thus, the outer dimensions of the lattice frame 5 were set to 904 mm in left and right length and 464 mm in front and rear width.

  Metal bearing bars 6.6 are attached to the outer surfaces of the horizontal bars 5a located at the front and rear ends of the lattice frame 5 in order to receive the load of the iron hole 3 for hand holes. As shown in FIG. 4, each bearing bar 6 has a left-right horizontally long cross section including a vertical plate portion 6a that is long in the left-right direction and a horizontal plate portion 6b that is horizontally bent from the upper end in the left-right direction. The vertical plate portion 6a is fastened and fixed by a bolt 12 passed through a bolt insertion hole 11 of the horizontal bar 5a and a nut 13 screwed to the bolt. In this bolted state, the horizontal plate portion 6b of each bearing bar 6 is positioned so as to protrude from the upper surface of the lattice frame 5.

  In order to prevent the grid frame 5 from being displaced in the left-right direction (the front-rear direction of the hand hole 1) on the upper surface 1a of the opening of the hand hole 1, the metal frame is formed on the back surface of the grid frame 5 Are mounted so that the respective stoppers 7 protrude downward. 3 and 4, each stopper 7 includes a horizontal fastening plate portion 7a which is long in the front-rear direction, and a locking plate portion 7b which is bent downward and extended from the left and right outer end sides in the front-rear direction. It was formed of a letter-shaped stainless steel plate.

  Separately, each stopper 7 is attached to the lattice frame 5 via a stopper 15. Therefore, as shown in FIG. 4, the stopper 15 includes a substantially U-shaped main body 15a, and locking portions 15b, 15b bent outward from the front and rear upper ends of the main body 15a. In a state in which the stopper 15 is dropped from above from between the horizontal bars 5a and 5a adjacent to the front and back of the lattice frame 5, and the locking portions 15b and 15b are hooked on the upper ends of the horizontal bars 5a and 5a, respectively, U The bottom of the character-shaped main body 15a and the fastening plate 7a of each stopper 7 are fastened with a fixing bolt 16. That is, bolt through holes 17 and 19 are provided in the fastening plate portion 7a of the stopper 7 and the flat bottom portion of the U-shaped main body portion 15a, and the fixing bolt 16 is passed through the bolt through holes 17 and 19 from below, so that the U-shaped main body portion 15a The nut 20 is screwed into the upper end of the insertion of the stop bolt 16 inside.

  In order to prevent the grid frame 5 from being displaced in the front-rear direction (left-right direction of the hand hole 1) on the upper surface 1a of the opening of the hand hole 1, the left and right ends of the back surface of the grid frame 5 are shown in FIGS. A pair of non-slip members 9 are attached as shown in FIG. The anti-slip member 9 used here was a rubber plate having a length of 100 mm in the left-right direction, a length of 300 mm in the front-rear direction, and a thickness of 3 mm, which was fixed to the back surface of the lattice frame 5 with an adhesive. The thickness of the non-slip member 9 is preferably 1 to 10 mm, more preferably 3 to 5 mm.

  As shown in FIGS. 2 and 5, each handle 10 is formed by bending a stainless steel metal bar into a gate shape having legs 10b at the front and rear ends of a handle 10a. A male screw 21 is provided on the outer periphery of the tip of the. Each of the handles 10 is fastened so as to protrude outside a central portion in the front-rear direction of each of the vertical bars 5b located at the left and right ends of the lattice frame 5. That is, as shown in FIG. 5, a bolt insertion hole 22 is made in the corresponding vertical bar 5b, each leg 10a of the handle 10 is inserted from the outside, and the vertical bar 5b is inserted into the male screw 21 of each leg 10b inside and outside. The handle 10 was fastened to the vertical bar 5b by screwing the two nuts 23 together in this state.

  The weight of the fall prevention device thus obtained was about 7 kg. When this is used, the state in which the iron cover 3 for a handhole is now closed will be described. In FIG. 1, an operator turns the lower end of the rod-shaped handle key into a key hole 25 provided in the iron cover 3 and turns it. As a result, the lower end of the handle key is locked around the lower end of the key hole 25 in a retaining shape. Next, the left and right ends of the iron lid 3 are lifted to an inclined posture with a handle key. As a result, a space is created between the iron cover seat 2, that is, the upper surface 1a of the opening of the handhole 1 and the iron cover 3 for the handhole. Insert it across the front and back.

  Since the left and right lengths of the lattice frame 5 are set to be sufficiently larger than the front-rear width dimension of the opening upper surface 1a of the handhole 1, the left and right end portions of the lattice frame 5 (located front and rear in the use state of FIG. 1) 3 is received on the road surface 26 around the handhole 1 as shown in FIG. The left and right ends of each bearing bar 6 also straddle the opening upper surface of the hand hole 1 in the front-rear direction, and are received on the road surface 26 and at least the upper surface of the iron lid seat 2.

  In the state where the fall prevention device of the present invention is installed in the above-described manner, the locking plate portions 7b of the stoppers 7 are respectively approached or received by the front and rear opposing inner edges of the iron lid seat 2, and the grid frame 5 is placed on the handhole 1. Is restricted in the left-right direction (the front-rear direction of the handhole 1). At the same time, both anti-slip members 9 frictionally engage with the road surface 26, and also restrict the grid frame 5 from being displaced in the front-rear direction (the left-right direction of the handhole 1) on the handhole 1. Therefore, even if the worker accidentally drops the handhole iron cover 3, the lower surface of the handhole iron cover 3 is received and supported by the lattice frame 5, and the fall prevention tool does not fall into the hole 1 almost. At this time, the bearing bars 6 and 6 compensate for the insufficiency of the lattice frame 5 made of plastics for weight reduction, and well withstand the drop impact of the iron cover 3 for hand holes.

  In the state of FIG. 1 in which the fall prevention device of the present invention is set in the above-described manner, the operator places the iron cover 3 for hand holes on the lattice frame 5 and drags the iron cover 3 toward the right side in FIG. Alternatively, the lifted side of the iron cover 3 for the handhole is horizontally rotated in one direction to open the iron cover 3 outside the handhole 1. In any case, at the time of this opening operation, the back surface of the iron cover 3 for hand holes is partially directly received only on the horizontal plate portion 6b of the bearing bar 6 protruding above the lattice frame 5, so that the hand hole The sliding operation of the iron lid 3 can be easily performed.

  When closing the upper surface 1a of the opening of the handhole 1, the fall prevention device of the present invention is used in a manner reverse to the case of opening. In this case, after pulling out the fall prevention device of the present invention from the handhole 1 with the handle 10 in the state of FIG. 1, the iron cover 3 for the handhole is dropped into the iron cover seat 2 and attached.

(Another embodiment example) The stoppers 7 to be provided on the left and right sides of the back surface of the lattice frame 5 may be one instead of being divided into two front and rear portions as in the illustrated example. The handhole 1 has a wide width in the front-rear direction in the figure, and there is a form in which a plurality of lattice frames 5 are arranged side by side on the opening upper surface 1a of the handhole 1, but the present invention can be applied to such a case. In that case, at least one of the left and right stoppers 7 will be in contact with and locked to one of the front and rear side edges of the other handhole iron lid 3 on the handhole 1.

Perspective view in use Overall bottom view Longitudinal front view of the main part around the stopper AA line sectional view in FIG. Longitudinal front view of the main part around the handle

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Hand hole 1a Hand hole opening upper surface 2 Iron lid seat 3 Iron hole for hand hole 5 Lattice frame 5a Lattice frame horizontal bar 5b Lattice frame vertical bar 6 Bearing bar 6a Bearing bar vertical plate part 6b Bearing bar horizontal plate Part 7 Stopper 7a Stopper fastening plate part 7b Stopper locking plate part 9 Non-slip member 10 Handle 10a Handle grip part 10b Handle leg 15 Stop fitting 15a U-shaped main body part 15b of stop fitting Stopping part of stop fitting 16 Fixing bolt 21 Male screw 22 Bolt insertion hole 23 Nut

Claims (9)

When opening and closing the horizontally long rectangular iron hole 3 for handhole, the iron cover 3 for handhole 1 is installed so as to straddle the upper surface 1a of the opening of the handhole 1 so as to prevent the iron hole 3 for handhole from falling into the handhole 1. A protective device,
A grid-shaped plastic grid frame 5 having a left-right length greater than the front-rear width dimension of the iron hole 3 for a hand hole, and formed in a left-right horizontal rectangle;
And a metal bearing bar (6) provided before and after the lattice frame (5) to receive the load of the handhole iron cover (3). When opening and closing the horizontally long rectangular iron hole 3 for handhole, the iron cover 3 for handhole 1 is installed so as to straddle the upper surface 1a of the opening of the handhole 1 so as to prevent the iron hole 3 for handhole from falling into the handhole 1. A protective device,
A grid-shaped plastic grid frame 5 having a left-right length greater than the front-rear width dimension of the iron hole 3 for a hand hole, and formed in a left-right horizontal rectangle;
A metal bearing bar 6 attached to the front and back of the lattice frame 5 to receive the load of the handhole iron cover 3;
First positioning means provided at the center left and right of the back surface of the lattice frame 5 to restrict the lattice frame 5 from being displaced in the left-right direction on the upper surface 1a of the opening of the handhole 1;
Second positioning means provided at the left and right ends of the back surface of the lattice frame 5 to restrict the lattice frame 5 from being displaced in the front-rear direction on the opening upper surface 1a of the handhole 1;
A handhole iron cover fall prevention tool including a handle 10 provided on at least one of the left and right ends of the lattice frame 5. When opening and closing the horizontally long rectangular iron hole 3 for handhole, the iron cover 3 for handhole 1 is installed so as to straddle the upper surface 1a of the opening of the handhole 1 so as to prevent the iron hole 3 for handhole from falling into the handhole 1. A protective device,
A lattice-shaped plastic lattice frame 5 having a left-right length larger than the front-rear width dimension of the iron hole 3 for a hand hole, and formed in a horizontally-long rectangular shape;
Left and right horizontally long metal bearings attached so that at least the upper end is flush with the upper surface of the lattice frame 5 or protrudes from the upper surface of the lattice frame 5 before and after the lattice frame 5 in order to receive the load of the iron cover 3 for hand holes. Bar 6,
A stopper 7 attached to the back surface of the grid frame 5 so as to protrude downward at the center left and right sides thereof in order to restrict the grid frame 5 from being displaced in the left-right direction on the upper surface 1a of the opening of the hand hole 1;
Non-slip members 9 attached to the left and right ends of the back surface of the grid frame 5 to restrict the grid frame 5 from being displaced in the front-rear direction on the opening upper surface 1a of the hand hole 1;
A fall prevention device for a handhole iron cover including a pair of left and right handles 10 attached to the left and right ends of the lattice frame 5.   The fall prevention device for an iron cover for a handhole according to claim 3, wherein the lattice frame 5 is formed in a lattice shape by a number of horizontal bars 5a running in the left-right direction and a number of vertical bars 5b running in the front-rear direction.   The fall prevention device for an iron cover for a handhole according to claim 4, wherein the lattice frame (5) is made of FRP. Each bearing bar 6 is formed of an L-shaped metal plate including a vertically long vertical plate portion 6a extending in the left-right direction and a horizontal plate portion 6b extending horizontally from the upper end thereof in the left-right direction.
The vertical plate portion (6a) is bolted to the outer surface of the horizontal bar (5a) located at the front and rear ends of the lattice frame (5), and the horizontal plate portion (6b) is located on the upper surface of the lattice frame (5) in this bolted state. The fall prevention device of the iron cover for a handhole described in the above. Each stopper 7 is formed of an L-shaped metal plate including a horizontal fastening plate portion 7a that is long in the front-rear direction and a locking plate portion 7b that extends from the outer end in the left-right direction in the front-rear direction.
It has a stopper 15 for attaching each stopper 7 to the lattice frame 5,
The stopper 15 includes a substantially U-shaped main body portion 15a, and locking portions 15b, 15b that are bent outward from the front and rear upper ends of the main body portion 15a and are continuously provided.
In a state where the locking portions 15b of the stopper 15 are hooked on the upper ends of the horizontal bars 5a adjacent to the front and rear of the lattice frame 5, the bottom of the main body 15a of the stopper 15 and the fastening plate portion of each stopper 7 The fall prevention device for a handhole iron cover according to claim 4 or 5, wherein each stopper (7) is fastened to the lattice frame (5) via a stopper (15) with a stop bolt (16) passed between the stopper (7) and the stopper (7a).   The fall prevention device for an iron cover for a handhole according to claim 3, wherein the non-slip member (9) is a rubber plate and is attached to the back surface of the lattice frame (5). Each handle 10 is formed in a gate shape by bending a metal bar and having legs 10b at front and rear ends of a handle 10a,
Outside the central portion in the front-rear direction of each vertical bar 5b located at the left and right ends of the lattice frame 5, each handle 10 has a male screw 21 provided on each of the front and rear legs 10b, and a leg provided on the vertical bar 5b. The fall prevention device for a handhole iron cover according to claim 3, wherein the bolt is inserted by a bolt insertion hole (22) that allows the insertion of the bolt (10b) and a nut (23) screwed into the male screw (21).

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