JP3246557U - Opening/closing cover rotation stopper device - Google Patents

Abstract

[Problem] To provide an opening/closing lid rotation stopper device that prevents an opening/closing lid in an upwardly open state from accidentally closing downward, and that allows the opening/closing lid to be detachably separated from the lid outer frame. [Solution] An opening/closing lid rotation stopper device 1 that is attached to a corner of an outer lid frame 12 on the side of the rotation fulcrum of an opening/closing lid 11, the opening/closing lid rotation stopper device 1 being composed of a lid mounting plate 2 that is attached to the opening/closing lid 11, a locking plate claw 3 that fixes the lid mounting plate 2 in a predetermined rotational position, a stopper piece 43 that stops and supports the lid mounting plate 2 to which the opening/closing lid 11 is attached in the predetermined rotational position, and a base 4 to which the lid mounting plate 2, the locking plate claw 3, and the stopper piece 43 are attached. [Selected Figure] Figure 2

Description

This invention relates to an opening/closing lid that is installed in a location that opens upward and downward, and opens upward to open the opening portion and closes downward to close the opening portion, and in particular to an opening/closing lid rotation stopper device that has a stopper function that prevents the opening/closing lid in an upward open state from accidentally closing downward, for example, due to exposure to wind or contact with a person or object.

There is a known type of openable cover that is installed at an opening facing up and down, and opens upward to open the opening, and closes downward to close the opening. A downward manhole or an internal space is formed in the opening. When a manhole is formed, the openable cover attached to the opening opens upward, and workers enter and exit the hole to perform necessary work inside. For this reason, a ladder is provided on the side of the downward manhole for climbing up and down.
The opening and closing cover that opens upward has a hinge at its end, and can be opened by rotating, for example, about 120 degrees upward from the horizontal plane around this hinge. If the opening and closing cover is fully opened by rotating it 180 degrees horizontally, when the work is finished and it is time to close the cover, it will be necessary to rotate it 180 degrees back in the original closing direction. Since the opening and closing cover is made of metal such as an iron plate and is heavy, it is troublesome to stand up a heavy opening and closing cover in a fully open horizontal state. For this reason, it is designed to open to a certain degree, for example, about 120 degrees, and stop there.
The lid is opened by rising upward, for example, at about 120 degrees, and is maintained in the open state, and workers enter and exit the manhole in the open state to carry out their work. At this time, a stopper, for example a metal tension rod, is attached to the inside of the lid to prevent it from closing easily during work, for example, if a strong wind blows against the open lid or if a person or object hits it.
When the lid is open, the tension rod is inclined up and down, and its middle part is bent slightly upward and outward, preventing the lid from closing. When closing the lid, the middle part that is bent upward and outward is pulled downward and inward by hand, and the tension rod bends around the middle part due to the weight of the lid, releasing the stopper function and allowing the lid to close. One end (upper end) of this metal tension rod is welded to the inside of the lid, and the other end (lower end) of the tension rod is welded to the inside surface of the lid outer frame to which the lid is attached.
On the outer surface behind the inner surface of the opening/closing cover where one end (upper end) of the tension rod is welded, small weld marks are visible and look unsightly, so the weld marks need to be treated, but they cannot be completely removed.
In addition, when workers enter or exit the manhole, if the tension rod that holds the open opening and closing lid is on the side where the ladder is located on the inside of the manhole, it will get in the way of entering or exiting the manhole. Therefore, when the tension rod is welded to the opening and closing lid and its outer frame in advance at the factory, it is necessary to check the position of the ladder on the inside of the manhole in advance. However, due to miscommunication on site, there are often cases where the tension rod for the opening and closing lid ends up directly above the ladder on the inside of the manhole.
Furthermore, the opening and closing lid is attached to the inside of the outer lid frame by a hinge so that it can rotate freely, and because the opening and closing lid and the outer lid frame are one piece, the overall weight is heavy and it cannot be transported in a light truck, etc., so transporting it from the factory to the site and setting it up on site is difficult.
By allowing the opening/closing lid to be freely attached and detached from the outer lid frame, the weight of each component is reduced by separating the opening/closing lid and the outer lid frame compared to a unitary type, and the work of transporting it from the factory to the site and setting it up on site is also lighter, improving workability.

Patent Publication 2019-152092 Patent Publication 2019-027060

In the above case, however, small weld marks are visible on the outer surface, which is the back side of the inner surface of the opening/closing cover where one end (upper end) of the tension rod is welded, resulting in an unsightly appearance. Therefore, the weld marks need to be treated, but they cannot be completely removed.
Furthermore, when workers enter or exit the manhole, if the tension rod that holds the open access cover is located on the side of the inside of the manhole where the ladder is installed, this will hinder entry and exit into the manhole.
Furthermore, when the tension rod is welded to the opening and closing lid and its outer frame in advance at the factory, it is necessary to check the position of the ladder on the inside side of the manhole in advance, but due to miscommunication on site, there are often cases where the tension rod for the opening and closing lid ends up being formed directly above the ladder on the inside side of the manhole, which is an error that often occurs.
Furthermore, the opening/closing lid is attached to the inside of the outer lid frame by a hinge so that it can rotate freely, and because the opening/closing lid and the outer lid frame are integrated, the overall weight is heavy and it cannot be transported in a light truck, etc., so transporting it from the factory to the site and setting it up on site is difficult.

This invention was invented in consideration of the above problems and to solve them, and its purpose is to provide a cover rotation stopper device that prevents the cover from accidentally closing downwards when open upwards, and that allows the cover to be detachably separated from the cover outer frame.

In order to achieve the above object, the invention of claim 1 provides a method for installing a cover rotation stopper device at a corner of a rectangular cover outer frame that is provided around the lower periphery of a cover that is installed flat on the surface of an entrance for workers and rotates up and down to open and close the cover, the corner being the rotation fulcrum of the cover,
The opening/closing cover rotation stopper device is composed of a cover mounting plate attached to the opening/closing cover, a locking plate claw that fixes the cover mounting plate attached to the opening/closing cover when the opening/closing cover rotates upward and opens in a predetermined rotation position, a stopper piece that stops and supports the cover mounting plate to which the opening/closing cover is attached when the opening/closing cover is in the predetermined upward rotation position, and a base to which the cover mounting plate, the locking plate claw and the stopper piece are attached,
a rounded engagement plate is attached to a side surface of one longitudinal end of the lid mounting plate, a lock engagement groove is formed on an outer peripheral side surface of the engagement plate, and a circular rotation center hole is formed at one longitudinal end of the lid mounting plate and at a rotation center portion of the engagement plate;
The locking plate claw is rotatably supported on one side plate of the base, a claw piece is formed on the inner surface of one longitudinal end of the locking plate claw to be engaged with the lock engagement groove of the engagement plate, and an unlocking piece is attached to the tip of the locking plate claw on the side where the claw piece is formed,
The stopper piece is horizontally installed at the upper part near the rear side of one of the left and right side panels and the other side panel of the base, and a pivot axis is horizontally installed forward of the stopper pieces of the one of the left and right side panels and the other side panel of the base, which supports one longitudinal end of the lid mounting plate and the engagement plate so that they can be freely rotated.

The invention of claim 2 provides a cover rotation stopper device that is attached to a corner of a rectangular cover outer frame that is provided around the lower periphery of an opening/closing cover that is installed flat on the surface of an entrance for workers and rotates up and down to open and close the opening/closing cover, the corner being the rotation fulcrum side of the opening/closing cover,
The opening/closing cover rotation stopper device is composed of a cover mounting plate attached to the opening/closing cover, a locking plate claw that fixes the cover mounting plate attached to the opening/closing cover when the opening/closing cover rotates upward and opens in a predetermined rotational position, a stopper piece that stops and supports the cover mounting plate to which the opening/closing cover is attached when the opening/closing cover is in the predetermined upward rotational position, and a base to which the cover mounting plate, the locking plate claw and the stopper piece are attached,
a rounded engagement plate is attached to a side surface of one longitudinal end of the lid mounting plate, a lock engagement groove is formed on an outer peripheral side surface of the engagement plate, and a circular rotation center hole is formed at one longitudinal end of the lid mounting plate and at a rotation center portion of the engagement plate;
The locking plate claw is rotatably supported on one side plate of the base, a claw piece is formed on the inner surface of one longitudinal end of the locking plate claw to be engaged with the lock engagement groove of the engagement plate, and an unlocking piece is attached to the tip of the locking plate claw on the side where the claw piece is formed,
The stopper pieces are provided laterally at the upper rear portions of the left and right side panels and the other left and right side panels of the base, and a pivot shaft is provided laterally forward of the stopper pieces of the left and right side panels and supports one longitudinal end of the lid mounting plate and the engagement plate so as to be freely rotatable,
an opening/closing lid attachment/detachment insertion groove is formed from one longitudinal end side of the lid attachment plate and the pivot center hole of the engagement plate toward one end side of the lid attachment plate and the periphery of the engagement plate, the opening/closing lid being in a downward direction when the opening/closing lid is in an upwardly opened position, and the groove width of the opening/closing lid attachment/detachment insertion groove on the pivot center hole side is made smaller than the diameter of the pivot center hole, and the groove width of the one end side and the periphery of the engagement plate is made larger than the diameter of the pivot center hole,
The rotation center shaft of the base has a circular cross-sectional shape on its outer periphery, and a detachable surface that is slightly recessed from the arc is formed toward the axial direction of the base. The diameter of the detachable surface on the outer periphery of the rotation center shaft is made smaller than the groove width of the narrowest part of the opening/closing lid attachment/detachment insertion groove of the lid mounting plate, and the diameter of the circular cross-sectional shape of the rotation center shaft excluding the detachable surface is made larger than the groove width of the narrowest part of the opening/closing lid attachment/detachment insertion groove.

According to the opening/closing lid rotation stopper device according to the invention of claim 1, which is a means for solving the problem, the claw piece of the locking plate claw is inserted into the locking engagement groove of the lid mounting plate, and is locked and engaged, so that the opening/closing lid in the upward open state can be prevented from suddenly closing downward, for example, due to exposure to wind or contact with a person or object. Moreover, the locked state can be easily released by removing the claw piece of the locking plate claw from the locking engagement groove.

In addition, the lid rotation stopper device according to the invention of claim 2 has the effect of claim 1, and by using the lid rotation stopper device to make the lid detachable from the lid outer frame, the weight of each component is reduced by separating the lid and the lid outer frame compared to when the lid and the lid outer frame are integrated, and the transportation from the factory to the site and the installation work on site are also lightened, improving workability, and providing extremely practical and beneficial effects.

FIG. 1A is an overall side view of an opening/closing cover showing an embodiment of the invention, and FIG. 1A is a side view of an opening/closing cover rotation stopper device showing an embodiment of the invention, and FIG. 1A is a side view of a lid mounting plate constituting an opening/closing lid rotation stopper device showing an embodiment of the invention, and FIG. 1A is a side view of a lock plate claw that constitutes an opening/closing cover rotation stopper device showing an embodiment of the invention, and FIG. 1A is a side view of a base constituting an opening/closing cover rotation stopper device showing an embodiment of the invention, and FIG. 1A to 1C are explanatory diagrams of the operation of the locking mechanism of the opening/closing lid rotation stopper device, showing an embodiment for implementing this invention; 1D is a plan view of 1A; 1E is a plan view of 1B; and 1F is a plan view of 1C. 1A to 1C are explanatory diagrams showing the operation of the lock release mechanism of the opening/closing lid rotation stopper device, illustrating an embodiment for implementing this invention; 1D is a plan view of 1A; 1E is a plan view of 1B; and 1F is a plan view of 1C. 1A to 1C are explanatory views of the operation of the opening/closing lid rotation stopper device when removing the lid mounting plate, showing an embodiment of the invention.

The invention will be explained in more detail below based on the embodiment shown in the drawings.

In the figure, the opening/closing lid rotation stopper device 1 is composed of a lid mounting plate 2 to which the opening/closing lid 11, which is installed flat on the surface of the worker's entrance/exit, is directly attached, a locking plate claw 3 that fixes the lid mounting plate 2 in a specified rotational position when it is rotated upward and opened, a stopper piece 43 that stops and supports the lid mounting plate 2 to which the opening/closing lid 11 is attached when the lid 11 is in the specified upward rotational position, and a base 4 to which the lid mounting plate 2, locking plate claw 3, and stopper piece 43 are attached.

The opening/closing cover rotation stopper device 1 is attached to the left and right sides of the opening/closing cover 11, which rotates upward to open and downward to close. The opening/closing cover 11 rotates upward to open and downward to close, with the opening/closing cover rotation stopper device 1 attached to both the left and right sides as the rotation fulcrum.

The opening/closing cover rotation stopper device 1 functions as a pivot point for the opening/closing cover 11, which rotates upward to open and downward to close, and also functions to fix the opening/closing cover 11, which has rotated upward to open, in a predetermined rotation position and to release that fixation.

The opening and closing lid 11 is made of a strong metal door panel, and in the drawing it is shown as a set of two door panels that open upwards on both sides like a double door, but if the entrance is small it may be made of a single door panel. Each door panel of the opening and closing lid 11 is fitted with a handle 11a for opening and closing.

Each door panel of the opening and closing lid 11 is, for example, rectangular in shape, and the peripheral sides of the rectangular door panel are formed from side panels 11b that are bent inward at right angles, increasing the rigidity of the door panel so that it does not easily deform under the weight of an operator standing on it.

A square outer cover frame 12 is provided around the lower periphery of the opening/closing lid 11. The square outer cover frame 12 is formed in a flat shape around the periphery of the opening for workers to enter and exit. The opening/closing lid rotation stopper device 1 is attached by welding or other means to one of the corners of the square outer cover frame 12 formed around the lower periphery of the opening/closing lid 11.

The lid mounting plate 2 constitutes a part of the opening/closing lid rotation stopper device 1, and is fixed integrally by welding or the like along a part of the side plate 11b on the rotation fulcrum side of the opening/closing lid 11. Through this lid mounting plate 2, the opening/closing lid 11 can be rotated upward to open and downward to close.

When the opening/closing lid 11 is opened upward, a mostly circular engagement plate 21 with a thick, rounded outer periphery is fixed integrally to one side of one longitudinal end of the lid mounting plate 2, which is the lower end, by welding or the like. A V-shaped locking groove 22, for example, is formed in part of the thick outer periphery of the rounded circular engagement plate 21.

This lock engagement groove 22 is formed at a location where the claw piece 31 of the lock plate claw 3 engages and locks when the opening/closing lid 11 is in a predetermined rotational position where it is open and facing upward. This lock engagement groove 22 is formed, for example, at a location where the lid mounting plate 2 faces downward when the opening/closing lid 11 is in a closed position.

A circular through-hole 23 is formed at one longitudinal end of the lid mounting plate 2 and at the center of rotation of the engagement plate 21. A rotation center shaft 44 of the base 4 (described below) is inserted into this hole 23, and the one end of the lid mounting plate 2 is supported by the rotation center shaft 44 of the base 4 through this hole 23 so that it can rotate freely.

In addition, for example, when the opening/closing lid 11 is opened upwards to a position almost directly above, an opening/closing lid attachment/detachment groove 24 is formed that opens downward from one longitudinal end of the lid attachment plate 2 and the pivot center hole 23 of the engagement plate 21 toward one end of the lid attachment plate 2 and the periphery of the engagement plate 21. Both side surfaces of this opening/closing lid attachment/detachment groove 24 are closed surfaces, and the bottom and front of the groove are open.

The groove width of the opening/closing lid attachment/detachment groove 24 tapers toward the pivot center hole 23 so that the lid mounting plate 2 does not easily come off the pivot center shaft 44 of the base 4, and is slightly smaller than the diameter of the pivot center hole 23 on the side that contacts the pivot center hole 23. The groove width on the peripheral side of the engagement plate 21 on the opposite side is slightly wider than the diameter of the pivot center hole 23.

This opening/closing lid attachment/detachment groove 24 is used when removing the opening/closing lid 11 to which the lid mounting plate 2 is fixed from the opening/closing lid rotation stopper device 1, or when attaching it to the opening/closing lid rotation stopper device 1. In other words, it is used when the opening/closing lid attachment/detachment groove 24 is inserted relative to the rotation center shaft 44 of the base 4.

The lid mounting plate 2 of the opening/closing lid rotation stopper device 1 uses this opening/closing lid attachment/detachment insertion groove 24 to slip out of the rotation center axis 44 of the base 4, and is separated from the lid outer frame 12 fixed to the base 4. This allows the opening/closing lid 11, with the lid mounting plate 2 fixed to the side plate 11b, to be transported separately from the lid outer frame 12.

The locking plate claw 3 constitutes part of the opening/closing lid rotation stopper device 1, and serves the function of preventing the heavy opening/closing lid 11 from suddenly falling over and closing due to a sudden wind blow or an object or person hitting or touching it while the opening/closing lid 11 is rotating upwards to open, causing accidents resulting in personal injury, etc.

The locking plate claw 3 is a long plate-like member with a claw piece 31 formed on the inner surface of one end of the plate in the longitudinal direction, protruding laterally. The claw piece 31 protrudes toward the tip in, for example, a V-shape, and is formed in a shape that engages with the locking engagement groove 22 on the outer periphery of the engagement plate 21, which is V-shaped and concave.

The locking plate claw 3 has a protruding claw piece 31 formed on the inner surface of one end of the plate in the longitudinal direction, which is engaged in the locking groove 22 formed on the side peripheral surface of the engagement plate 21 of the lid mounting plate 2, thereby locking the rotation of the lid mounting plate 2 and preventing the lid mounting plate 2 from rotating up and down around the rotation center hole 23.

The locking plate claw 3 is a plate-like member that is long in one direction, and its central portion in the longitudinal direction is supported by a side plate 41 (described below) of the base 4 so that it can rotate freely up and down. A rotation shaft hole 32 with a circular cross section is formed on one side of the central portion where the locking plate claw 3 is supported.

The tip of a shaft 41c, such as a bolt, that passes through a shaft hole 41b formed in one side panel 41 of one side of the base 4 is inserted into the pivot shaft hole 32 of the locking plate claw 3, and the locking plate claw 3 is pivotally supported on the tip of the shaft 41c.

A plate-shaped unlocking piece 33 is fixed integrally to the tip of the locking plate claw 3 on the side where the claw piece 31 is formed, by welding or the like. The unlocking piece 33 is provided so as to protrude outward from one side plate 41 of the base 4. When releasing the locked state of the locking plate claw 3, an operator pushes the unlocking piece 33 protruding outward upward, causing the locking plate claw 3 to rotate upward and the claw piece 31 to come out of the lock engagement groove 22.

In addition, a protrusion 34 is formed on the end of the locking plate claw 3 on the opposite side in the longitudinal direction to the claw piece 31, facing the same lateral direction as the claw piece 31, across the pivot shaft hole 32 in the center of the locking plate claw 3. A blocking piece 35 is formed on the side of the tip of this protrusion 34, protruding toward the other side plate 42 of the base 4 that faces it across a gap.

When the opening/closing lid 11 is closed, the lid mounting plate 2 fixed to the side plate 11b of the opening/closing lid 11 is inclined horizontally, but the upper surface of the preventing piece 35 of the locking plate claw 3 is in contact with the lower side of the horizontal lid mounting plate 2. The preventing piece 35 of the locking plate claw 3 is in contact with the lower side of the lid mounting plate 2, preventing the unlocking piece 33 of the locking plate claw 3 from rotating upward.

The lid mounting plate 2, locking plate claw 3, and stopper piece 43 are attached to the base 4, and the lid mounting plate 2 and locking plate claw 3 are rotatably supported on the base 4. The base 4 is fixed integrally to each corner of the rectangular lid outer frame 12 by welding. When two opening/closing lids 11 are used, the base 4 is provided at four corners of the rectangular lid outer frame 12, and when one opening/closing lid 11 is used, the base 4 is provided at two corners of the rectangular lid outer frame 12.

The base 4 is composed of a left and right side panel 41 and other side panel 42 spaced apart, a stopper piece 43 provided at the top near the rear of the left and right side panel 41 and other side panel 42 in a direction crossing them, and a pivot shaft 44 provided at the top center of the left and right side panel 41 and other side panel 42 in a direction crossing them.

The plate-shaped one side panel 41 and the other side panel 42 are arranged parallel to each other with a gap between them. When viewed from the side, the one side panel 41 has a shape that is close to a rectangle that is long in the front-to-back direction, and the horizontal upper and lower sides of the one side panel 41 are formed parallel to each other from top to bottom. A pivot axis 44 is installed horizontally inside the space between the one side panel 41 and the other side panel 42 on the left and right.

The front side of one side panel 41 has a front edge 41a that is perpendicular to the horizontal upper and lower edges. The rear side of one side panel 41 has a rear edge that is perpendicular to the horizontal upper edge and faces downward, but from the middle, it forms an inclined edge that slopes diagonally forward and reaches the lower edge. The vertical rear edge is shorter in length than the vertical front edge 41a.

The other side panel 42 also has a slightly horizontally elongated shape in the front-to-rear direction when viewed from the side. The height of the other side panel 42 is the same as that of the one side panel 41, and the horizontal upper and lower edges of the other side panel 42 are formed parallel to each other from top to bottom. The front side of the other side panel 42 differs from the one side panel 41 in that it is formed with an inclined front edge 42a that is slightly rearward of the vertical front edge 41a of the one side panel 41 and that is slightly inclined upward and backward. The inclination angle of the inclined front edge 42a is close to vertical, for example, about 80 degrees.

The rear side of the other side panel 42 is formed in exactly the same shape as the rear side of the one side panel 41. A vertical rear edge is formed downward from the horizontal upper edge, and from the middle, an inclined edge is formed that slopes diagonally forward and reaches the lower edge. The vertical rear edge is shorter in length than the inclined front edge 42a that is slightly inclined backward.

The locking plate claw 3 is rotatably supported on the side surface of the front side panel 41. The front side surface portion of the side panel 41 on which the locking plate claw 3 is rotatably supported is a portion that protrudes slightly forward from the inclined front edge 42a of the other side panel 42. The locking plate claw 3 is rotatably supported only on one side panel 41 of the base 4.

The aforementioned circular shaft hole 41b is formed in the front side of one side plate 41 on which the locking plate claw 3 is pivotally supported. The pivot shaft hole 32 of the locking plate claw 3 can freely pivot without resistance on the shaft 41c that passes through this shaft hole 41b.

The stopper piece 43 provided on the base 4 is a support piece that supports and stops the opening/closing lid 11 when it rotates upward and opens in a position tilted slightly rearward from directly above. The opening/closing lid 11 is supported by the stopper piece 43 at an open angle rotated, for example, about 120 degrees from the horizontal closed position. A metal plate piece is used for the stopper piece 43.

The stopper piece 43 stops and supports the opening/closing lid 11 when it is rotated upward to a predetermined rotational position, for example, an open angle of about 120 degrees, by abutting one side of the lid mounting plate 2 that is integrally attached and fixed to the side plate 11b of the opening/closing lid 11. The stopper piece 43 is attached between the left and right side plates 41 and the other side plate 42 on the upper rear side of the base 4.

The stopper piece 43 is attached horizontally between one side plate 41 and the other side plate 42 on the left and right sides of the base 4 with the flat portion of the plate tilted diagonally upward so that the flat portion of the plate abuts evenly against one side portion of the lid mounting plate 2 at the same angle as the opening and closing lid 11, for example, by rotating about 120 degrees.

The left and right side panels 41 and 42, to which the stopper pieces 43 are attached at both ends when tilted, have their mounting portions cut into grooves at an angle equal to the thickness of the stopper pieces 43. Most of the stopper pieces 43, except for the upper inclined sides on both sides, are inserted into the cut grooves in the left and right side panels 41 and 42 and fixed in place by welding or the like.

The pivot shaft 44 of the base 4 is installed horizontally in a direction crossing the left and right side panels 41 and 42 near the upper center of the two panels. Both ends of the pivot shaft 44 are fixed to the left and right side panels 41 and 42 by welding or the like, and are structured not to rotate. The pivot shaft 44 rotatably supports one longitudinal end of the lid mounting plate 2 and the engagement plate 21.

The diameter of the circular portion of the pivot center hole 23 of the engagement plate 21 of the lid mounting plate 2 is slightly larger than the diameter of the circular portion of the pivot center shaft 44 of the base 4, so that the pivot center hole 23 of the lid mounting plate 2 can freely rotate around the pivot center shaft 44 of the base 4 without resistance. The pivot center hole 23 of the engagement plate 21 on one end side of the lid mounting plate 2 is attached to the outer periphery of this pivot center shaft 44 so as to be freely rotatable and freely attachable.

The pivot shaft 44 of the base 4 has a removable surface 44a formed on the outer periphery of the circular cross section, which is slightly recessed from the arc, e.g., a flat surface. The removable surface 44a is formed toward the axial direction of the pivot shaft 44. The diameter of the portion of the outer periphery of the pivot shaft 44 where the removable surface 44a is formed is smaller than the groove width of the narrowest portion of the opening/closing lid removable insertion groove 24 of the lid mounting plate 2. The diameter of the circle excluding the removable surface 44a of the pivot shaft 44 is larger than the groove width of the narrowest portion of the opening/closing lid removable insertion groove 24.

The pivot hole 23 of the engagement plate 21 of the lid mounting plate 2 can be removed from or attached to the pivot shaft 44 of the base 4 by using the attachment/detachment surface 44a of the pivot shaft 44, which is smaller than the narrowest groove width of the opening/closing lid attachment/detachment insertion groove 24. On the other hand, the diameter of the pivot shaft 44 other than the attachment/detachment surface 44a is larger than the narrowest groove width of the opening/closing lid attachment/detachment insertion groove 24, so the lid mounting plate 2 will not come off the pivot shaft 44 of the base 4 except at the attachment/detachment surface 44a of the pivot shaft 44.

A reversal prevention piece 41d is provided on part of the front edge 41a of one side plate 41 of the base 4, which prevents the claw piece 31 of the locking plate claw 3 from reversing toward the front of the base 4 due to the reverse rotation of the locking plate claw 3. The reversal prevention piece 41d is fixed by welding or the like to the front edge 41a at a position slightly above the pivot shaft hole 32 of the locking plate claw 3.

The reversal prevention piece 41d abuts against the side surface of the locking plate claw 3 opposite the claw piece 31, thereby preventing the locking plate claw 3 from reversing about the shaft 41c inserted into the pivot shaft hole 32 as a fulcrum in the direction away from the outer peripheral side surface on which the lock engagement groove 22 of the engagement plate 21 of the lid mounting plate 2 is formed. As a result, the claw piece 31 of the locking plate claw 3 is always in contact with the outer peripheral side surface on which the lock engagement groove 22 of the engagement plate 21 is formed, due to the balance of its weight with the shaft 41c inserted into the pivot shaft hole 32 as a fulcrum.

Next, the use of the configuration of the embodiment for carrying out the invention will be described below.
At the factory, the opening/closing lid rotation stopper device 1 is fixed by welding or the like to some of the corners of the square lid outer frame 12 formed around the lower periphery of the opening/closing lid 11. When two opening/closing lids 11 are used, the opening/closing lid rotation stopper device 1 is attached to four corners of the lid outer frame 12. When one opening/closing lid 11 is used, the opening/closing lid rotation stopper device 1 is attached to two corners of the lid outer frame 12.

If the lid mounting plate 2 of the opening/closing lid rotation stopper device 1 has not been fixed to the side plate 11a of the opening/closing lid 11 in advance by welding or other means, after the opening/closing lid rotation stopper device 1 is installed, the lid mounting plate 2 of the opening/closing lid rotation stopper device 1 is attached to the side plate 11a of the opening/closing lid 11 by welding or other means.

After the opening/closing lid rotation stopper device 1 is attached to the corner of the lid outer frame 12 of the opening/closing lid 11, the opening/closing lid 11 is transported to the site. At this time, if the weight of the opening/closing lid 11, lid outer frame 12, and opening/closing lid rotation stopper device 1 is too heavy, the opening/closing lid 11 is removed from the opening/closing lid rotation stopper device 1 of the lid outer frame 12, and the opening/closing lid 11 is transported separately from the lid outer frame 12 and the opening/closing lid rotation stopper device 1 (see Figure 8).

As shown in FIG. 8, to remove the opening/closing lid 11 from the opening/closing lid rotation stopper device 1, rotate the closed opening/closing lid 11 upward to open it, and adjust it so that the groove direction of the opening/closing lid attachment/detachment insertion groove 24 formed in the engagement plate 21 of the lid mounting plate 2 is parallel to the flat attachment/detachment surface 44a formed on the rotation center axis 44 of the base 4.

The opening/closing lid 11 is raised by adjusting the rotation angle to, for example, 100 to 110 degrees, or more, so that the opening/closing lid insertion/removal groove 24 and the attachment/detachment surface 44a are parallel. One side of the opening/closing lid insertion/removal groove 24 moves upward while abutting against the attachment/detachment surface 44a of the pivot center shaft 44, and the lid attachment plate 2 fixed to the side plate 11a of the opening/closing lid 11 by welding becomes one with the opening/closing lid 11 that is raised, and is pulled upward and removed from the pivot center shaft 44 of the base 4 of the opening/closing lid rotation stopper device 1.

When attaching the divided opening/closing lid 11 to the opening/closing lid rotation stopper device 1 fixed to the lid outer frame 12 at the site, the procedure is reversed from that described above. In other words, adjust the groove direction of the opening/closing lid attachment/detachment groove 24 formed in the engagement plate 21 of the lid mounting plate 2 so that it is parallel to the attachment/detachment surface 44a of the rotation center shaft 44 of the base 4, and press the opening of the opening/closing lid attachment/detachment groove 24 downward toward the rotation center shaft 44 of the base 4.

One side of the opening/closing lid attachment/detachment groove 24 formed in the engagement plate 21 of the lid mounting plate 2 moves downward while abutting against the attachment/detachment surface 44a of the pivot center shaft 44, and the pivot center hole 23 formed on the upper side of the opening/closing lid attachment/detachment groove 24 is inserted into the pivot center shaft 44 of the base 4, and the opening/closing lid 11 is attached to the opening/closing lid rotation stopper device 1.

Next, the operation of the opening/closing lid 11, which rotates upward to open and downward to close, will be described with reference to Figs. 6 and 7, using the rotation center shaft 44 of the base 4 of the opening/closing lid rotation stopper device 1 as a fulcrum.
To open the closed cover 11, the handle 11a is grasped and pulled upward. The cover 11 rotates upward around the pivot 44 of the base 4 of the cover rotation stopper device 1. The cover 11 opens when the cover mounting plate 2 fixed to the side plate 11b rotates upward around the pivot 44 of the base 4 as a fulcrum.

When the side of the lid mounting plate 2 rotates upward, it abuts against the stopper piece 43 installed horizontally at the upper rear side of the base 4, and the opening and closing lid 11 stops rotating upward and enters an open state. During this time, the lock plate claw 3, which is rotatably supported on the base 4, has the claw piece 31 at its tip end in contact with the outer peripheral surface of the engagement plate 21 rotating upward. The lock engagement groove 22 formed on the outer peripheral surface of the engagement plate 21 rotating upward rotates to the position of the claw piece 31, and the lid mounting plate 2 abuts against the stopper piece 43 of the base 4 (see Figure 6).

At the same time that the cover mounting plate 2 abuts against the stopper piece 43, the claw piece 31 of the locking plate claw 3 is inserted into the locking groove 22, and the engagement plate 21 is prevented from rotating and locked. When the claw piece 31 of the locking plate claw 3 is inserted into the locking groove 22, the unlocking piece 33 fixed to the upper end of the claw piece 31 abuts against the upper edge of one side plate 41 of the base 4.

By locking the rotation of the engagement plate 21, the engagement plate 21 is prevented from rotating in the opposite direction to the direction in which the opening/closing lid 11 is closed. As a result, the opening/closing lid 11 that is open upwards cannot be closed, and the opening/closing lid 11 will not suddenly close downwards, even if it is exposed to wind or touched by a person or object.

When closing the opening/closing lid 11 that is open upward, the locked state of the engagement plate 21 of the lid mounting plate 2 is released. To unlock the engagement plate 21, the unlocking piece 33 that is in contact with the upper edge of one side plate 41 of the base 4 is pushed upward. When the unlocking piece 33 is pushed upward, the unlocking piece 33 to which the unlocking piece 33 is fixed rotates upward around the shaft 41c inserted into the pivot shaft hole 32 as a fulcrum, and the claw piece 31 on the tip side also moves upward and disengages from the lock engagement groove 22.

When the claw piece 31 of the locking plate claw 3, which has been locking and preventing the rotation of the engagement plate 21 of the lid mounting plate 2, is released from the locking engagement groove 22, it no longer impedes the rotation of the opening/closing lid 11 in the closing direction, and the opening/closing lid 11, which was open upward, can be rotated downward to close (see Figure 7).

This invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of this invention. In the case of a lightweight device in which the opening/closing lid 11 does not need to be removed from the opening/closing lid rotation stopper device 1, the opening/closing lid attachment/detachment groove 24 formed in the engagement plate 21 of the lid mounting plate 2 can be omitted. Similarly, the attachment/detachment surface 44a of the rotation center shaft 44 of the base 4 can also be omitted.

REFERENCE SIGNS LIST 1 open/close lid rotation stopper device 11 open/close lid 11a handle 11b side panel 12 lid outer frame 2 lid mounting panel 21 engagement panel 22 lock engagement groove 23 rotation center hole 24 open/close lid attachment/detachment insertion groove 3 lock plate claw 31 claw piece 32 rotation shaft hole 33 lock release piece 34 protrusion piece 35 prevention piece 4 base 41 one side panel 41a front edge 41b shaft hole 41c shaft 41d inversion prevention piece 42 other side panel 42a inclined front edge 43 stopper piece 44 rotation center shaft 44a attachment/detachment surface

Claims (2)

an opening/closing lid rotation stopper device is attached to a corner portion of a rectangular lid outer frame provided around the lower periphery of an opening/closing lid that is installed flat on the surface of an entrance/exit for workers and rotates up and down to open and close, the corner portion being the rotation fulcrum side of the opening/closing lid;
The opening/closing cover rotation stopper device is composed of a cover mounting plate attached to the opening/closing cover, a locking plate claw that fixes the cover mounting plate attached to the opening/closing cover when the opening/closing cover rotates upward and opens in a predetermined rotation position, a stopper piece that stops and supports the cover mounting plate to which the opening/closing cover is attached when the opening/closing cover is in the predetermined upward rotation position, and a base to which the cover mounting plate, the locking plate claw and the stopper piece are attached,
a rounded engagement plate is attached to a side surface of one longitudinal end of the lid mounting plate, a lock engagement groove is formed on an outer peripheral side surface of the engagement plate, and a circular rotation center hole is formed at one longitudinal end of the lid mounting plate and at a rotation center portion of the engagement plate;
The locking plate claw is rotatably supported on one side plate of the base, a claw piece is formed on the inner surface of one longitudinal end of the locking plate claw to be engaged with the lock engagement groove of the engagement plate, and an unlocking piece is attached to the tip of the locking plate claw on the side where the claw piece is formed,
An opening/closing lid rotation stopper device characterized in that the stopper piece is horizontally installed at the upper part near the rear side of one of the left and right side panels and the other side panel of the base, and a rotation center axis is horizontally installed forward of the stopper pieces of the one of the left and right side panels and the other side panel of the base, which supports one longitudinal end side of the lid mounting plate and the engagement plate so that they can rotate freely. an opening/closing lid rotation stopper device is attached to a corner portion of a rectangular lid outer frame provided around the lower periphery of an opening/closing lid that is installed flat on the surface of an entrance/exit for workers and rotates up and down to open and close, the corner portion being the rotation fulcrum side of the opening/closing lid;
The opening/closing cover rotation stopper device is composed of a cover mounting plate attached to the opening/closing cover, a locking plate claw that fixes the cover mounting plate attached to the opening/closing cover when the opening/closing cover rotates upward and opens in a predetermined rotational position, a stopper piece that stops and supports the cover mounting plate to which the opening/closing cover is attached when the opening/closing cover is in the predetermined upward rotational position, and a base to which the cover mounting plate, the locking plate claw and the stopper piece are attached,
a rounded engagement plate is attached to a side surface of one longitudinal end of the lid mounting plate, a lock engagement groove is formed on an outer peripheral side surface of the engagement plate, and a circular rotation center hole is formed at one longitudinal end of the lid mounting plate and at a rotation center portion of the engagement plate;
The locking plate claw is rotatably supported on one side plate of the base, a claw piece is formed on the inner surface of one longitudinal end of the locking plate claw to be engaged with the lock engagement groove of the engagement plate, and an unlocking piece is attached to the tip of the locking plate claw on the side where the claw piece is formed,
The stopper pieces are provided laterally at the upper rear portions of the left and right side panels and the other left and right side panels of the base, and a pivot shaft is provided laterally forward of the stopper pieces of the left and right side panels and supports one longitudinal end of the lid mounting plate and the engagement plate so as to be freely rotatable,
an opening/closing lid attachment/detachment insertion groove is formed from one longitudinal end side of the lid attachment plate and the pivot center hole of the engagement plate toward one end side of the lid attachment plate and the periphery of the engagement plate, the opening/closing lid being in a downward direction when the opening/closing lid is in an upwardly opened position, and the groove width of the opening/closing lid attachment/detachment insertion groove on the pivot center hole side is made smaller than the diameter of the pivot center hole, and the groove width of the one end side and the periphery of the engagement plate is made larger than the diameter of the pivot center hole,
An opening/closing lid rotation stopper device characterized in that a removable surface that is slightly recessed from a circular arc is formed in a part of the outer periphery of the circular cross section of the rotation center shaft of the base toward the axial direction, the diameter of the removable surface on the outer periphery of the rotation center shaft is smaller than the groove width of the narrowest part of the opening/closing lid attachment/detachment insertion groove of the lid mounting plate, and the diameter of the circular cross section of the rotation center shaft excluding the removable surface is larger than the groove width of the narrowest part of the opening/closing lid attachment/detachment insertion groove.

Images