JP2825459B2 - Manhole cover opening aid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assisting device for opening a manhole cover, and more particularly, to removing a fixed state between a manhole base frame and a cover by applying an impact to a cover fixed to the manhole base frame. The present invention relates to a manhole cover opening aid that assists in easily opening a manhole cover.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view showing a conventional manhole cover opening aid of this kind. In FIG. 4, a manhole cover opening assisting tool (bar) 31 is configured such that a tip (lower end) of a rod 32 is thinned to form a hook 33, and a handle 38 is integrally provided on the upper part of the rod 32. I have.

[0003] The locking portion 33 of the rod 32 is pushed from above into a gap between the manhole cover and the base frame in a fixed state and a through hole formed in the manhole lid, and the rod 32 is turned sideways so that the lever is laid down. Was used to forcibly open the manhole cover from the manhole base frame.

[0004]

However, the cover of the manhole is stuck in the base frame due to the passage of a car or a person, and often becomes in a fixed state with the base frame. In some cases, the lid could not be opened from the base frame. Thus, one of the main objects of the present invention is to separate the fixed manhole cover from the base frame with a simple operation, thereby enabling the manhole cover to be easily opened from the base frame. To provide tools.

[0005]

According to the present invention, there is provided a rod-shaped member having a hook at a tip end for locking the manhole cover, a weight member provided movably upward along the rod-shaped member, A receiving piece provided on the rod-shaped body for receiving the weight member moving upward, wherein a hook of the rod-shaped body is hung on a manhole cover, and the weight member is moved to move the weight member. The impact force at that time is transmitted to the manhole cover via the receiving piece and the rod-like body, thereby releasing the fixed state between the manhole cover and the base frame, and opening the manhole cover. A manhole cover opening assisting device characterized in that it is configured to assist.

That is, the present invention is configured such that a hook formed at the tip of a rod-shaped body can be hooked on a manhole cover, and the weight member is moved upward to strike the receiving piece. The impact force (or kinetic energy) is transmitted to the manhole cover via the receiving piece and the rod-shaped body, so that the fixed state of the manhole base frame and the cover can be easily eliminated.

Here, in order to move the weight member (by hand) and strike it against the receiving piece, the weight member itself is vigorously moved upward or a handle is attached to the weight member and the weight member is similarly moved by the handle. or, as a separate body from the weight member separately operating member, the operating member
Is placed below the weight member and with the weight member
May be provided so as to be movable upward along the rod-shaped body, and may be similarly moved by the operation member.

In the present invention, the hook provided at the tip of the rod-shaped body penetrates a gap between the base frame of the manhole and the lid or a through hole formed in the manhole and is hooked on the back surface of the manhole cover. Alternatively, the manhole cover is engaged with the hook-shaped concave portion and is locked so that a force is applied upward to the manhole cover. Specifically, the hooking portion is formed so that the tip of the rod-shaped body is formed in a T-shape or hook-like shape, and is preferably formed to have a thin tip and extend in a T-shape or hook-like shape.

The weight member usable in the present invention preferably has a weight of 3 to 10 kg.
More preferably, it is 7 kg.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. Note that the present invention is not limited to this. FIG. 1 is a front view showing one embodiment of a manhole cover opening assisting device according to the present invention, and FIG. 2 is an explanatory diagram showing a method of using the manhole cover opening assisting device (including other embodiments). It is.

In FIG. 1, a manhole cover opening assisting tool (bar) 1 includes a rod-shaped body 2, a hook portion 3 having a thin T-shaped end and a substantially T-shape, and a rod-shaped body 2. Is provided with a movable iron weight member 4, a holding piece 6 for holding the weight member below the rod 2, and a receiving piece 5 for receiving the weight member 4 above the rod 2. And the weight member 4 is connected to the handle of the weight member 4.
The operating arm 7 which is formed by including in one piece.

[0012] Thus, the manhole cover opening aid 1
In FIG. 1 and FIG. 2, especially in FIG. 2, the hook 3 is inserted from above into a key-shaped through hole (A) formed in the cover (H) of the manhole and rotated by 90 °, thereby turning the manhole. Lid (H)
The T-shaped portion of the hooking portion 3 is hooked on the back surface of. Then
The operating arm 7 of the weight member 4 is pulled up vigorously upward and the weight member 4 is hit against the receiving piece 5 (in this case, the bar 2 is preferably supported by a person different from the operator.
Of course, it may be separately supported by something like a stand. When the impact force (kinetic energy) at that time is applied to the back surface of the manhole cover (H) via the receiving piece 5 and the rod-shaped body 2, surprisingly, the manhole cover (H) and the base frame (K) ) Can be separated from each other even if they are in a fixed state, thereby facilitating opening of the lid (H) from the base frame (K).

Further, as described above, the manhole cover opening assisting device 1 secures the manhole cover (H) to the base frame (K) only by applying an impact force (kinetic energy) to the back surface of the manhole cover (H). Since the state can be eliminated, it is not necessary to use the principle of leverage, the rod-shaped body 2 can be shortened, and eventually the entire manhole cover opening aid 1 can be reduced in size. Now, the manhole cover (H), which has been released from the fixed state with the base frame (K) as described above, can be easily opened by hand or with the cover opening assisting tool 1, and is opened by the connecting rod B at a predetermined opening. Can be held in position. That is, with the opening of the manhole cover H, the connecting rod B is moved while being pivoted by the pivot pin C, and the stopper D of the connecting rod B is brought into contact with the hole E so that the lid H is removed from the manhole base frame K. Can be held open in a connected state.

In FIG. 2, unlike the above embodiment, the hooking portion may be hook-shaped, like the hooking portion 13 of the rod 12. FIG. 3 is a diagram corresponding to FIG. 1 showing another embodiment. In FIG. 3, the weight member is
The handle is used in the above embodiment (the handle shown in FIG. 1).
Unlike the operating arm 7) , a pair of arms 27a and 27b that face each other on a straight line may be formed. Note that 28
Is a handle of the rod 22.

[0015]

According to the present invention, since the impact force can be applied upward to the manhole cover only by moving the weight member, it is easy to open the fixed manhole cover.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a manhole cover opening aid according to the present invention.

FIG. 2 is an explanatory view illustrating a manhole cover opening aid shown in FIG. 1 and a method of using the same in another embodiment.

FIG. 3 is a diagram corresponding to FIG. 1, showing another embodiment.

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening aid of manhole cover 2 Rod-shaped body 3 Hook part 4 Weight member 5 Receiving piece 6 Holding piece 7 Operation arm A Through hole H Manhole cover K Manhole base frame

Claims (5)

(57) [Claims] 1. A rod-shaped body provided with a hook at a tip for hanging on a lid of a manhole, a weight member provided movably upward along the rod-shaped body, and a rod member provided on the rod-shaped body, And a receiving piece for receiving the weight member moving to the, the hook portion of the rod-shaped body is hung on a manhole cover, and the weight member is moved to strike the receiving piece. The impact force is transmitted to the manhole cover via the receiving piece and the rod-shaped body, thereby eliminating the fixed state between the manhole cover and the base frame, and assisting opening of the manhole cover. A lid opening aid for manholes. 2. The manhole cover opening aid according to claim 1, wherein the weight member includes a handle. 3. The weight member is separate from the weight member.
Located below the member and along the rod with the weight member
Move the weight member, which is provided to be movable upward
The manhole cover opening aid according to claim 1 , further comprising an operating member for driving and hitting the receiving piece . 4. The rod-shaped body is provided with a handle.
A lid opening aid for any one of the above-mentioned manholes. 5. The manhole cover opening assisting device according to claim 1, wherein the hooking portion extends in a T-shape or a hook shape by narrowing a tip of the shaft.