JPH0722991Y2 - Manhole key - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a manhole key for opening and closing an iron lid and an inner lid of a manhole.

(Problems to be Solved by Prior Art and Invention) Many conventional manhole keys have a structure in which a force is directly applied, and workability is poor. 5 (a), (b) and (c) are diagrams for explaining a conventional manhole key and an example of its use.

FIG. 3A shows a hand key 33 having a key at its tip, which is engaged with a keyhole of the manhole iron cover 24 to open and close the manhole iron cover 24 by two workers. The manhole iron cover 24 cannot be easily opened and closed because the receiving frame 25 is rusted. Further, the manhole key 34 of FIG. 2B uses a lever, but it is only for opening and closing the manhole iron cover 24, and the manhole inner cover (not shown) cannot be opened or closed. Further, FIG. 3C shows a T-shaped manhole key 35 with wheels 36 provided at both ends.
However, like the manhole key 34, the manhole cover cannot be opened or closed. Next, the manhole key 37 shown in Fig. (D) is a handle for opening and closing the manhole cover 26.
38 manipulators are operated by two workers to unlock the manhole cover 26 and lift it up, but the manhole iron cover cannot be opened or closed.

As described above, the conventional manhole key has the drawbacks of poor workability and poor usability because it is dedicated.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a manhole key for opening and closing an iron lid and an inner lid of a manhole.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a lower table, an upper table, an operation table, and an operation pipe. The lower table is substantially trapezoidal and has a girder at its lower end, and has a hole at the center. It has a middle plate and an upper plate, and a locking part for locking the upper base on the upper end side, and the upper base has a U-shaped cross-section and is connected to a lower base on a shaft and a bottom plate to rotate. And a hole for inserting a pin that engages with the lower table is provided in the bottom plate, and the operation table has a plate shape facing the operation table, and is pivotally supported by the shaft provided in the upper table. Inside, rotatably supports a key having a manhole cover and a convex part that engages with the keyhole at the tip, and extends an arm for lifting the manhole cover at the upper end opposite to the supporting part of the key. However, the pipe for inserting the operation pipe must be fixed between the arm and the operation base. The manhole key characterized by and is the gist of the invention.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
Needless to say, the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

1 (a), (b) and (c) are views showing an embodiment of the present invention, wherein FIG. 1 (a) is a front view, FIG. 1 (b) is a side view,
FIG. 3C is a side view of the connecting pipe for operation. In these figures, the manhole key is composed of a lower table 1, an upper table 2, an operation table 3 and an operation pipe 4 used when opening and closing the iron lid.

Hereinafter, these structures will be sequentially described.

The lower base 1 is formed in a trapezoidal shape as a whole, and has a shape that does not easily fall down against a load from an oblique upper direction. Further, a girder 5 is fixed to the bottom portion in order to maintain stability during operation. Further, a middle plate 6 is provided in the middle part, and an upper plate 7 is provided on the upper surface part, and holes 8 and 9 for supporting the rotating shaft 13 of the upper base 2 are formed in the central parts of the middle plate 6 and the upper plate 7. . Further, a hole 10 for a stopper pin is provided on the side edge of the upper plate 7, and a metal fitting 11 for the stopper pin 23 is provided on the side plate of the lower base 1 at a position facing the hole 10.

Next, the upper base 2 has a U-shaped cross section, and the rotating shaft 13 projects from the center of the lower surface of the bottom plate 12 to engage with the holes 8 and 9 provided in the middle plate 6 and the upper plate 7 of the lower base 1. The upper base 2 can freely rotate with respect to the lower base 1. Also, there is a pin on the shaft 13.
14 is inserted through the lower surface of the middle plate 6 of the lower base 1, and the lower base 1 and the upper base 2
And do not leave. Further, a shaft 15 for pivotally supporting the operation console 3 is provided at the center of the upper base 2,
Further, a locking notch 16 for locking the stopper 20 provided at the upper end of the operation table 3 is formed.

Further, the operation table 3 is a pair of plate-shaped members facing each other, is pivotally supported by a shaft 15 provided on the upper table 2, is freely rotatable back and forth, and has a part for inserting the operation pipe 4 in the center thereof. Cutout pipe 17
Is fixed, and an arm 19 having an adapter receiver 18 for supporting an adapter (described later) used when opening and closing the manhole cover is provided at the tip end on the side opposite to the shaft fulcrum of the shaft 15 of the upper table 2, and In order to fix the operation table 3 at a predetermined position, a stopper 20 that engages with a locking notch 16 provided on the upper table 2 is rotatably supported. A key 21 for opening and closing the manhole iron cover is pivotally supported on the opposite side of the arm 19 by a shaft 22 so as to rotate. Further, 23 is a stopper pin for fixing the rotation of the upper base 2 to the lower base 1.

Next, a use example of the present invention will be described with reference to FIGS. 2 (a) and (b) to FIGS. 4 (a) and (b).

2 (a) and 2 (b) are diagrams for explaining opening / closing of the manhole iron cover. In the figure (a), the key 21 is attached to the manhole iron cover 24.
, The arm 19 is pushed down in the direction of arrow A to lift the manhole iron cover 24. In this way, the manhole iron lid 24 is lifted and the operation pipe 4 is inserted as a roller thereunder. At the time of this lifting, the stopper 20 and the locking notch 16 engage with each other, and a force acts in the direction of lifting the manhole iron cover 24. Next, the lifted manhole iron cover
The operation pipe 4 is inserted between 24 and its receiving frame 25. When the arm 19 is lifted in the direction of the arrow B in this state, the stopper 20 and the locking notch 16 are disengaged, and the manhole iron lid 24 becomes substantially horizontal. By pulling the arm 19 in the arrow C direction, the manhole iron lid 24 is pulled. Can move to the outside of the receiving frame 25 to open the manhole.

Next, FIGS. 3A and 3B are views for explaining opening and closing of the inner lid of the manhole. Also, FIGS. 4 (a) and (b)
FIG. 4 is a diagram illustrating details of an inner lid key adapter and an adapter receiver that are used to open and close the manhole inner lid.

In FIGS. 3A and 3B, 26 is a manhole inner lid for locking the manhole, and 27 is an inner lid key for opening and closing the manhole inner lid 26. The locking arm 28 of the manhole inner lid 26 can be moved to the lower end of the receiving frame 25 by operating the inner lid key 27 and locked. The figure shows the unlocked state. In this state, when the operation pipe 4 inserted into the pipe 17 of the operation console 3 is pushed down in the direction of the arrow D, the manhole inner lid 26 is fitted with the adapter 30 which is locked to the stop ring 29 inserted into the inner lid key 28. Lift by adapter holder 18.
The pin 14 shown in FIG. 1 is pulled out in the state of being lifted in this way (the same is true even if the pin 14 is pulled out and the above-mentioned operation is performed).
The manipulating table 3 is rotated about the rotary shaft 13 to move the manhole cover 26 to the outside of the manhole.

As shown in FIGS. 4 (a) and (b), the adapter 30 has a semicircular ring having one end connected with a hinge 31 and the other end having a protrusion 32.
The ring provided with is attached to the lower end of the stop ring 29, and the hinge 31 and the projection 32 lock the tip of the adapter receiver 18.

(Explanation of the Invention) As described above, according to the present invention, the lower table includes the lower table, the upper table, the operation table, and the operation pipe. The lower table is substantially trapezoidal and has a girder at the lower end, and has a hole in the center. A plate and an upper plate are provided, and the upper end has a locking portion that locks with the upper base.
The upper base has a U-shaped cross-section, and a shaft for pivotally supporting the operation table and a bottom plate are provided with a rotating shaft that is connected to the lower base for rotation. Further, the bottom plate is provided with a hole for inserting a pin engaging with the lower base. The operation table is a plate-shaped member facing each other, and is pivotally supported by a shaft provided on the upper table,
A rotatably supporting a key having a manhole cover and a convex portion engaging with the keyhole at the tip inside the plate, and for lifting the manhole cover at the upper end opposite to the supporting part of the key. By extending the arm and fixing the pipe for inserting the operation pipe between the arm and the operation base, by maximizing the lever principle, the manhole iron cover which is a heavy object Easy to open and close the manhole cover 1
It can be performed by a human worker, and work efficiency can be improved. In addition, there is an advantage that the safety can be improved.

[Brief description of drawings]

1 (a), (b) and (c) are diagrams showing an embodiment of the present invention, FIGS. 2 (a) and (b) are diagrams for explaining opening and closing of a manhole iron cover, and FIG. 3 ( (a) and (b) are views for explaining the opening and closing of the manhole inner lid, and FIGS. 4 (a) and (b) are for explaining the details of the inner lid key adapter and the adapter receiver used for opening and closing the manhole inner lid. Fig. 5 (a),
(B), (c) and (d) are figures explaining the conventional manhole key and its usage example. 1 …… Lower base 2 …… Upper base 3 …… Operation base 4 …… Operation pipe 5 …… Girder 6 …… Middle plate 7 …… Upper plate 8 …… Hole 9 …… Hole 10 …… Hole 11 …… Locking metal fitting 12 …… Bottom plate 13 …… Rotating shaft 14 …… Pin 15 …… Axis 16 …… Locking notch 17 …… Pipe 18 …… Adapter receiver 19 …… Arm 20 …… Stopper 21 …… Key 22 …… Axis 23 …… Stopper pin 24 …… Manhole iron lid 25 …… Receiving frame 26 …… Manhole inner lid 27 …… Inner lid key 28 …… Locking arm 29 …… Stop ring 30 …… Adapter 31 …… Hinge 32 …… Projection Department

Claims (1)

[Scope of utility model registration request] 1. A lower base, an upper base, an operating base and an operating pipe, wherein the lower base is substantially trapezoidal and has a girder at the lower end, and an intermediate plate and an upper plate each having a hole at the center, and an upper base at the upper end side. The upper table has a U-shaped cross-section, the upper table has a shaft for supporting the operation table, and the bottom plate is provided with a rotating shaft for connecting and rotating with the lower table. A hole for inserting a mating pin is provided, and further, the operation table is a plate-like member that opposes and is axially supported by a shaft provided on the upper table, and the inside of the plate-like plate engages with a manhole cover and a key hole at the tip. A key having a convex portion is rotatably supported, and at the upper end opposite to the supporting portion of the key,
A manhole key, wherein an arm for lifting a lid of a manhole is extended, and a pipe for inserting an operation pipe is fixed between the arm and an operation stand.