JPH09125435A - Lock device of water treatment tank cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate projections into the opening of a water treatment tank through which operators enter in the tank or get out thereof and secure the safety of operators entering therein or getting out thereof and easily discriminate the locked state and the unlocked state. SOLUTION: An operating shaft 43 provided with a movable fitting piece 4 is set in the first recess 35 of a cover body 3 and urged upward by springs 5. A fixed fitting piece 1 is provided in the cover receiver 110 of the water treatment tank P. When the movable fitting piece 4 is fitted thereby to the fixed fitting piece 1 from the underside by rotating the operation shaft 43 while pushing it down, the movable fitting piece is locked and when the operation shaft 43 is rotated reversely, it is unlocked. One can judge whether the cover is locked or not by confirming the state as to whether the head 45 of the operating shaft 43 projects from the upper face of the cover body 3 or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for locking a water treatment tank cover attached to and detached from an opening of a water treatment tank such as a septic tank.

[0002]

2. Description of the Related Art A cover is used to cover an opening in a water treatment layer such as a septic tank or a sewage treatment plant. Then, in these water treatment tanks, an operator goes in and out through an opening from which the cover is removed during cleaning and inspection. Also,
Generally, a plurality of cover lids are arranged side by side in one opening, and in such a water treatment tank, only a part of the cover lids may be removed for cleaning or inspection of the inside.

FIG. 9 and FIG. 10 show a cover lid A equipped with a conventional locking device and a water treatment tank P whose opening is covered by the cover lid A.

The water treatment tank P is provided with a stepped recessed lid receiving portion 110 on the peripheral portion of the rectangular opening 100, and the cover lid A is mounted on the lid receiving portion 110. The cover lid A is provided with a detachable handle unit 210.

The lock device has an operating shaft 202 penetratingly provided at one end of a rectangular cover body 201, a movable engaging piece 203 fixed to the lower end of the operating shaft 202, and a water treatment layer P. Fixed engaging pieces 204 and 205 protruding inward at the upper ends of the one side wall and the other side wall, and an engaging piece 20 attached to the back surface side of the other end of the cover lid body 201.
6 and 6 are provided as basic elements. Then, in the conventional locking device, the movable engaging piece 203 and the engaging piece 20
6, fixed engagement pieces 204, 205 and the like project into the water treatment tank P.

In this locking device, the operating shaft 202
When is rotated by a tool (not shown), the movable engagement piece 203 rotates together with the operation shaft 202. Then, when the cover lid A is placed on the lid receiving portion 110, the engagement piece 206 overlaps the fixed engagement piece 205 on the lower side and the movable engagement piece 203 overlaps the fixed engagement piece 204 on the lower side as illustrated. If they overlap, even if the cover lid A is lifted and removed, the movable engagement piece 203 engages with the fixed engagement piece 204 and the engagement piece 206 makes the fixed engagement piece 20.
The cover lid A cannot be removed since it is engaged with the cover 5.
Locked.

From this locked state, the operating shaft 202 is rotated to rotate the movable engagement piece 203 as shown by arrow a in FIG. 10 to a non-engaged position where it does not overlap the fixed engagement piece 204, and the unlocked state is obtained. Then, one end of the cover lid A can be lifted and the cover lid A can be removed. After the cover lid A is placed on the lid receiving portion 110 in the unlocked state, the operation shaft 202 is rotated and the movable engagement piece 203 is rotated as indicated by arrow b in FIG.
It will be in a locked state if it is stacked on the lower side.

[0008]

By the way, the water treatment tank P
When the worker goes in and out of the water treatment tank P using the opening 100 with the cover lid A removed when cleaning or inspecting, the fixed engagement piece 2 is attached to the side wall of the water treatment tank P as described above.
It is dangerous if 04 and 205 are protruding. Further, in the case where a plurality of cover lids A ... Are mounted side by side in one opening 100 of the water treatment tank P, when a worker goes in and out from a position opened by removing a predetermined cover lid. Is not only the fixed engagement pieces 204, 205 protruding on the side wall of the water treatment tank P, but also the remaining cover A ...
00, the movable engaging piece 203 and the engaging piece 20 protruding in 00
6 is also dangerous.

The present invention has been made under the above circumstances, and it is possible to ensure the safety of entry and exit of workers by eliminating protrusions into the openings of the water treatment tanks through which workers enter and exit. An object of the present invention is to provide a locking device for a processing tank cover.

[0010]

A locking device for a water treatment layer cover according to the present invention has two stepped recessed lid receiving portions provided at the edge of the opening of a water treatment tank, which are opposed to each other. A fixed engagement piece protruding inwardly on each of the rising surfaces, and one end surface of the cover lid main body that is provided in a fitting manner in the lid receiving portion and is formed at one end of the cover lid main body to cover the opening. Side opening and a steep recess on the lower surface side of the cover lid main body, and a first recessed portion into which one of the fixed engagement pieces can be inserted and removed, and a head provided rotatably in the first recessed portion. And an operating shaft that is vertically movable between a position where it projects from the upper surface of the cover lid body and a position where its head does not project from the upper surface of the cover lid body, and a lateral direction from the operating shaft in the first recessed portion. When the operation shaft is extended, it is fitted into the first recessed portion when the operation shaft is moved downward. Teikakarigohen is positioned below than, as well as positioning the head of the operating shaft when engaged to the fixed engagement piece at a position not protruding from the upper surface of the covering body,
A movable engagement piece that is swung between a non-engagement position that does not overlap the fixed engagement piece and an engagement position that overlaps the fixed engagement piece by rotating the operation shaft; A spring body for constantly urging the operating shaft in the upward direction, a spring body formed at the other end of the cover lid body, opened at the other end surface side of the cover lid body, and provided with an engaging portion on the upper surface side of the cover lid body. The other of the fixed engagement pieces includes a second recessed portion that can be fitted and removed.

In the lock device constructed as described above, the operating shaft and the movable engaging piece which are the components thereof are housed in the first recessed portion formed in the cover lid main body, and the engagement of the second recessed portion is carried out. The portion is provided on the upper surface side of the cover lid main body, and the fixed engagement piece is projected inward at the rising surface of the stepped recessed lid receiving portion provided at the edge of the opening of the water treatment tank. , There is no member protruding in the opening of the water treatment layer.

In this locking device, when the movable engaging piece is in the non-engaging position, the head of the operating shaft is held at the position projecting from the upper surface of the cover body by the force of the spring body. When the movable engagement piece overlaps the lower side of the fixed engagement piece at the engagement position, the head portion of the operation shaft is held at a position where it does not project from the upper surface of the cover lid body against the force of the spring body. Therefore, it is possible to determine whether the cover lid is locked or not by determining whether or not the head of the operation shaft projects from the upper surface of the cover lid body.

In this locking device, the head of the operation shaft protruding from the upper surface of the cover lid body is pushed down against the force of the spring body, and the operation shaft is rotated to move the movable engagement piece to the non-engagement position. It is possible to lock the cover lid by rotating the cover lid to the engaging position. Further, the lock can be released by rotating the operation shaft to pivot the movable engagement piece from the engagement position to the non-engagement position.

In the present invention, the engaging portion is provided on the back of the operating shaft in the first recessed portion, and the movable engaging piece engages with the base end portion of the movable engaging piece corresponding to the engaging portion. It is possible to adopt a configuration in which an engaging portion is provided that prevents the unidirectional turning from the position to the non-engaging position and allows the unidirectional turning. With this configuration, when the movable engagement piece is rotated from the non-engagement position to the engagement position by rotating the operation shaft, the movable engagement piece can be reliably aligned with the engagement position. Like

In the present invention, in the first recessed portion, the movable engaging piece does not overlap the fixed engaging piece when the operating shaft is rotated, and the movable engaging piece does not overlap the fixed engaging piece. It is desirable that a guide member that guides between the fixed engagement piece and the engagement position that overlaps is provided. By adopting this configuration, the movable engagement piece can be swung from the non-engagement position to the engagement position overlapping the fixed engagement piece below the fixed engagement piece simply by rotating the operation shaft. Like

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially omitted vertical sectional front view showing a cover A to which a lock device according to the present invention is attached and a water treatment tank P in which an opening 100 is covered with the cover A, and FIG. A plan view, FIG. 3 is a plan view of other main parts, and FIG. 4 is an unlocked cover lid A and a water treatment tank P in which the opening 100 is covered by the cover lid A.
FIG. 5 is a vertical cross-sectional front view of the main part of FIG. 5, and FIG. 5 is a vertical cross-sectional side view of the unlocked cover A.

In the water treatment tank P, a stepped recessed lid receiving portion 110 is provided by embedding an L-shaped steel material in the peripheral portion of the rectangular opening 100. This lid receiving part 110
The fixed engagement piece 1 is projected inward from the rising surface 111 on one side, and similarly, the fixed engagement piece 2 is projected inward from the rising surface 112 on the other side of the lid receiving portion 110. . These fixed engagement pieces 1 and 2 are formed by rectangular plate materials slightly protruding from the rising surfaces 111 and 112, and the whole thereof is accommodated in the lid receiving space formed by the lid receiving portion 110. That is, the fixed engagement pieces 1 and 2 do not project into the opening 100 of the water treatment tank P.

In the cover lid A, the panel-shaped cover lid body 3 has surface materials 3 on the upper and lower sides (front and back) of the FRP or foam synthetic resin plate.
Hollow units 32 and 33 made of stainless steel, which is a metal that is difficult to rust, are formed in a suitable position at one end and a suitable position at the other end of the same by screws 34. It is installed in. Therefore, the hollow unit 32 is provided at one end portion of the cover lid body 3 by the first recessed portion 3
5 is formed, and the second recessed portion 36 is formed at the other end by the hollow unit 33. The first recessed portion 35 is open at one end surface side of the cover lid body 3, and a steal recess 37 is formed on the lower surface side of the cover lid body 3 as shown in FIG. The second recessed portion 35 is open on the other end surface side of the cover lid body 3.

A tubular guide 39 is provided in the bottom plate portion 38 of the hollow unit 32 forming the first recessed portion 35, and the tubular guide 39 is provided in the first recessed portion 35.
While the hollow unit 32 is fixed so as to project inward, a circular opening 42 is formed in the cover portion 41 of the hollow unit 32 concentrically with the cylindrical guide 39. The operation shaft 4 having the large-diameter head portion 45 at the upper end of the small-diameter shaft portion 44
The shaft portion 44 of No. 3 is fitted in the tubular guide 39 so as to be rotatable and vertically slidable, and the head 45 of the operating shaft 43 is fitted in the opening 42 so as to be rotatable and vertically slidable. There is. A square hole 45a is formed in the head portion 45, and the operation shaft 43 can be rotated by a tool inserted in the square hole 45a.

The movable engaging piece 4 made of a flat plate material is fixed to the shaft portion 44 of the operating shaft 43. As can be seen in FIG. 2, the movable engaging piece 4 extends laterally from the operating shaft 43 in the first recessed portion 35, and the contour line of one corner portion of the base end portion is bent at about 90 degrees. The contour line of the other one corner portion has an arc shape with the axis of the operation shaft 43 as the center. On the other hand, a planar locking portion 46 formed by the end surface of the cover lid body 3 is located on the back of the operation shaft 43, and the proximal end of the movable engaging piece 4 is located at this locking portion 46. Department corresponds. Therefore, from the state where the movable engagement piece 4 is in the position shown by the solid line in FIG.
When 3 is to be rotated clockwise (clockwise), one corner portion of the movable engaging piece 4 whose contour line is bent at about 90 degrees hits the locking portion 46 and the movable engaging piece 4 is rotated. Block 4 turn clockwise. However, when it is attempted to rotate the operation shaft 43 in the counterclockwise direction (counterclockwise), the contour line of the other one corner portion of the movable engaging piece 4 has an arcuate shape, so that the movable engaging piece 4 has a circular arc shape. It is possible to turn counterclockwise. Therefore, at the base end portion of the movable engaging piece 4, the contour line is bent at about 90 degrees.
One corner portion functions as an engaging portion 47 corresponding to the engaging portion 46, and the movable engaging piece 4 is indicated by an arrow X in FIG. 2 by the cooperation of the engaging portion 47 and the engaging portion 46. As described above, it is possible to turn only in the range of about 90 degrees.

As shown in FIGS. 1, 4 and 5, a spring body 5 made of a coil spring is interposed between the bottom plate 38 of the hollow unit 32 and the movable engaging piece 4, and the spring body 5 is provided with the spring body 5. The operation shaft 43 is constantly urged in the upward direction by the force.

Here, when the cover lid A is placed on the lid receiving portion 110 to cover the opening 100 of the water treatment tank P, the fixed engagement piece 1 is placed in the first recessed portion 35 as shown in FIGS. It will be in a fitted state. When the movable engagement piece 4 is engaged with the fixed engagement piece 1 fitted in the first recess 35 as shown in FIG. 1 from below, the position of the operation shaft 43 is the spring body 5. The head portion 45 of the operating shaft 43 is held at that position against the force of the above, and is held at a position where it does not protrude from the upper surface of the cover lid body 3. Further, when the movable engagement piece 4 is turned to a position where it does not overlap the fixed engagement piece 1, the operation shaft 43 is moved upward by the force of the spring body 5 as shown in FIGS.
Protrude from the upper surface of the cover body 3.

The second recessed portion 36 is provided with an engaging portion 36a on the upper surface side of the cover lid body 3. The cover body 3 has a handle unit (not shown) similar to that described in FIGS. 7 and 8, and the cover unit 1 can be held by hand.
It is designed to be attached to and detached from 10.

In the lock device constructed as described above, when the operating shaft 43 is pushed to the lower limit of movement against the force of the spring body 5, the position of the movable engaging piece 4 is changed to the first recessed portion 3.
The fixed engagement piece 1 fitted to the 5 is positioned below the fixed engagement piece 1.

Next, the operation will be described.

When the cover lid A is placed on the lid receiving portion 110 to cover the opening 100 of the water treatment tank P, before the one end portion of the cover lid body 3 is placed on the lid receiving portion 110, the other portions of the cover lid body 3 are covered. The end portion is mounted on the lid receiving portion 110, and the fixed engagement piece 2 is fitted into the second recessed portion 36 of the cover lid body 3. From that state, one end of the cover lid body 3 is moved downward with the other end of the cover lid body 3 as a fulcrum. At that time, the movable engaging piece 4 is set at the position shown by the phantom line (two-dot chain line) in FIG.

When one end portion of the cover lid main body 3 is placed on the lid receiving portion 110, the fixed engagement piece 1 is inserted into the first recessed portion 35 as shown in FIG.
Then, the operation shaft 43 is rotated clockwise in FIG. 2 while pushing down the head portion 45 of the operation shaft 43 protruding from the upper surface of the cover body 3 against the force of the spring body 5. Manipulate. By this operation, the movable moving engagement piece 4 pivots from the non-engagement position, which is the position shown by the phantom line in FIG. 2, to the engagement position, which is the position shown by the solid line in FIG.
By releasing the pushing force against the movable engagement piece 4, the movable engagement piece 4 is engaged with the fixed engagement piece 1 by the force of the spring body 5 as shown by the arrow N in FIG. Is held at a position where it does not protrude from the upper surface of the cover lid body 3. Locked.

Next, from the locked state shown by the solid lines in FIGS. 1 and 2, the operation shaft 43 is rotated counterclockwise in FIG. 2 to move the movable engagement piece 4 from the engagement position to the non-engagement position. The lock can be unlocked by turning, and in this unlocked state, the head portion 45 of the operation shaft 43 projects from the upper surface of the cover base 3 by the force of the spring body 5. Therefore, if the head 45 of the operation shaft 43 does not protrude from the upper surface of the cover lid body 3, it can be determined that the cover lid A is locked, and if the head 45 protrudes from the upper surface of the cover lid body 3, the unlocked state. That is, it can be determined that it is not locked.

Here, the non-engagement position is a position where the movable engagement piece 4 does not overlap the fixed engagement piece 1, and the engagement position is the movable engagement piece 4 with respect to the fixed engagement piece 1. The overlapping position.

In this embodiment, when the movable engagement piece 4 is swung from the non-engagement position to the engagement position, it is necessary to push down the operation shaft 43 against the force of the spring body 5.
According to another embodiment shown in FIGS. 6 to 8, the operating shaft 43
The operating shaft 43 automatically moves downward against the force of the spring body 5 simply by rotating.

FIGS. 6 and 7 are vertical sectional front views of a main portion of the cover lid A to which the lock device according to another embodiment is attached, and FIG. 8 is a vertical sectional side view of the main portion of the cover lid A to which the lock device is attached. In this embodiment, the operation shaft 43 is provided in the first recess 35.
Between the non-engaging position where the movable engaging piece 4 does not overlap the fixed engaging piece 1 when the rotating engagement is performed and the engaging position where the movable engaging piece 4 overlaps the fixed engaging piece 1 below the fixed engaging piece 1. A guide member 6 for guiding by is provided. The guide member 6 includes a flat portion 61 and an inclined portion 62 that extends obliquely upward from the end of the flat portion 61, and is fixed to the cover portion 41 of the hollow unit 32. The flat portion 61 is located slightly below the fixed engagement piece 1 fitted in the first recessed portion 35.

With this structure, the movable engaging piece 4
When the operation shaft 43 is rotated in the direction of turning from the non-engagement position to the engagement position (clockwise direction in FIG. 2) as indicated by arrow R in FIG. 6, as indicated by arrow L in FIG. After the movable engaging piece 4 slides on the inclined portion 62 of the guide member 6 and turns while descending, the movable engaging piece 4 is fitted into the lower side of the flat portion 61, whereby the movable engaging piece 4 is fixed. The lower side is pivoted to an engaging position overlapping the fixed engaging piece 1. In FIG. 8,
The movable engagement piece 4 sliding on the inclined portion 62 is shown by a one-dot chain line and a two-dot chain line.

In the other embodiments described with reference to FIGS. 6 to 8, other configurations and operations are similar to those of the embodiment described with reference to FIGS. 1 to 5, and therefore, the same parts are designated by the same reference numerals and detailed description will be given. The description is omitted.

In the lock device of this embodiment, the operation shaft 43 and the movable engaging piece 4 which are the constituent elements of the lock device are the cover main body 3
Is accommodated in the first recessed portion 35, the engagement portion 36a of the second recessed portion 36 is provided on the upper surface side of the cover lid body 3, and the fixed engagement pieces 1 and 2 are provided in the water treatment tank P. Since it projects inward at the rising surface 111 of the stepped recessed lid receiving portion 110, there is no member protruding into the opening 100 of the water treatment layer P. Therefore, even if a worker goes in and out of the opening 100 for cleaning or inspection, there is no room for the member protruding in the opening 100 to hit the worker and get injured.

[0035]

According to the water treatment tank cover locking device of the present invention, most of the components of the operating shaft, the movable engaging piece, and the fixed engaging piece are located on the first recessed portion of the cover body and the water treatment tank side. Since the engaging portion of the second recessed portion, which is the remaining element accommodated in the lid receiving portion, is provided on the upper surface side of the cover lid main body, there is no member protruding into the opening of the water treatment layer. Therefore, the safety when the worker enters and leaves the water treatment tank is improved by utilizing the open portion secured by removing the cover. Further, there is an advantage that whether the cover lid is locked or not can be easily and surely determined simply by determining whether or not the head portion of the operation shaft is projected from the upper surface of the cover lid body.

Further, according to the one in which the engaging portion is provided on the back portion of the operating shaft and the engaging portion is provided at the base end portion of the movable engaging piece corresponding to the engaging portion, the operating shaft is rotated and operated. It becomes possible to reliably perform the operation of locking the movable engagement piece at the engagement position.

Further, according to the invention, the guide member for guiding the movable engaging piece between the non-engaging position and the engaging position is provided.
By simply rotating the operating shaft, the movable engaging piece can be swung from the non-engaging position to the engaging position that overlaps the fixed engaging piece under the fixed engaging piece. It is not necessary to perform the operation of pushing the operation shaft against the force of the spring body, which improves usability.

[Brief description of the drawings]

1 is a partially omitted vertical front view showing a cover with a lock device according to the present invention and a water treatment tank having an opening covered with the cover.

FIG. 2 is a plan view of a main part of FIG.

3 is a plan view of another main part of FIG. 1. FIG.

FIG. 4 is a vertical cross-sectional front view of an unlocked cover lid and a main part of a water treatment tank whose opening is covered by the cover lid.

FIG. 5 is a vertical cross-sectional side view of the unlocked cover lid.

FIG. 6 is a vertical cross-sectional front view of a main part of a cover lid to which a lock device according to another embodiment is attached, which is locked.

FIG. 7 is a vertical cross-sectional front view of a main part of the cover lid to which the lock device is attached and which is unlocked.

FIG. 8 is a vertical cross-sectional side view of a main portion of a cover lid to which the lock device is attached and which is locked.

FIG. 9 is a partially omitted vertical sectional view showing a cover and a water treatment tank provided with a conventional locking device.

FIG. 10 is a plan view showing a main part of a conventional locking device.

[Explanation of symbols]

 1, 2 Fixed Engagement Pieces 3 Cover Lid Main Body 4 Movable Engagement Piece 5 Spring Body 6 Guide Member 35 First Recessed Section 36 Second Recessed Section 36a Engagement Section 37 Stealing Recess 43 Operation Shaft 45 Head Section 46 Locking Section 47 Engaging part 100 Opening 110 Lid receiving part 111,112 Rising surface P Water treatment tank

Claims (3)

[Claims] 1. A fixed engagement piece that is inwardly projected on each of two rising surfaces facing each other in a stepped recessed lid receiving portion provided at the edge of the opening of the water treatment tank, It is fitted to the lid receiving portion and is formed at one end of the cover lid main body that covers the opening. The cover lid main body has an opening at one end face side and a cover recess on the lower surface side of the cover lid main body. At the same time, a first recessed portion into which one of the fixed engagement pieces can be fitted and removed, a position rotatably disposed in the first recessed portion, and a head portion of which protrudes from the upper surface of the cover lid body, and the head portion of the cover lid body. An operating shaft that is arranged to be vertically movable between a position that does not project from the upper surface, and extends laterally from the operating shaft in the first recessed portion,
When the operation shaft is moved downward, it is positioned lower than the fixed engagement piece fitted in the first recessed portion, and when engaged with the fixed engagement piece, the head portion of the operation shaft. Is positioned so as not to project from the upper surface of the cover lid main body, and by rotating the operating shaft, a non-engaging position that does not overlap the fixed engaging piece and an engaging position that overlaps the fixed engaging piece. A movable engaging piece which is swung between the cover body and a spring body which constantly urges the operation shaft in the upward direction; and a cover body which is formed at the other end of the cover body and opens on the other end surface side of the cover body. A locking device for a water treatment tank cover, comprising: an engaging portion on an upper surface side of a main body, and a second recessed portion into which the other of the fixed engaging pieces can be fitted and removed. 2. A locking portion is provided on a back portion of the operating shaft in the first recessed portion, and the movable engaging piece is located at a base end portion of the movable engaging piece corresponding to the locking portion from the engaging position. The locking device for the water treatment tank cover according to claim 1, further comprising an engaging portion which is provided at the engaging position so as to prevent the pivoting in one direction and allow the pivoting in the other direction. 3. A non-engaging position in which the movable engaging piece does not overlap the fixed engaging piece when the operating shaft is rotationally operated in the first recessed portion, and the fixed engaging piece is located below the fixed engaging piece. The locking device for the water treatment tank cover according to claim 1 or 2, further comprising a guide member that guides between the engagement position overlapping the piece.