JPH042201Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in an opening aid for manhole covers and other heavy covers.

(Prior art) In the past, the lid was opened by prying it open with a crowbar or pry bar and then pulling it out with a hand hook, and some of the lid opening aids include lids as shown in Japanese Utility Model Application No. 115539/1983. There are also some with improved mounting and opening methods. However, the purpose of this method is to pry open the lids, and therefore the stop bolts that clamp the lid periphery from above and below must be securely tightened, which is not very efficient. Furthermore, since the lid is only subjected to clamping pressure from above and below, it cannot be moved sideways or pulled out, and a separate lid-opening tool is required even though this is a series of operations. Therefore, the inventor
They devised an auxiliary tool that could perform a series of tasks using a single auxiliary tool, and had already filed an application, but as a result of further development, they arrived at an auxiliary tool with a more rational configuration.

(Technical Issues) Therefore, the purpose of the present invention is to provide a lid that can be pried open and pulled out using a single auxiliary tool, has a simpler structure than conventional ones, and can be attached to the lid easily. more stable;
Moreover, it is an object of the present invention to provide a manhole cover opening aid that is suitable for carrying.

(Technical Means) The present invention that achieves the above-mentioned object is provided with a tip hook 5 that locks with the locking part 4 of the lid body 3 at the tip of the horizontal rod part 2 of the auxiliary tool body 1, and a hook 5 that locks with the locking part 4 of the lid body 3. A restraining member 6 which is in contact with almost the whole part is loosely fitted into the sliding frame 7 so as to be movable back and forth.
A, 2b are formed therein, and the loose fitting hole 8 is formed with ridge lines 8a, 8b which press against the flat parts 2a, 2b.

(Example) The auxiliary tool main body 1 in the illustrated example has a side surface approximately L.
The horizontal rod part 2 at the lower end has flat parts 2 on the top and bottom.
It is formed in a rectangular cross section with a and 2b, and has a tip hook 5 that locks with a locking part 4 of a cover 3 such as a manhole at its tip. Appropriate rough surfaces may be provided on the flat portions 2a and 2b. The restraining member 6 is the horizontal rod portion 2 described above.
It is loosely fitted into the sliding frame 7 so as to be movable back and forth through the loose fitting hole 8 of the sliding frame 7, and is inclined forward at an angle where the entire lower surface touches the lid body 1, and furthermore, the lower front edge and the upper rear edge of the loose fitting hole are has ridgelines 8a and 8b that press into the flat portions 2a and 2b so as to bite into them. A feature of the present invention is that the horizontal rod portion 2 and the loose fitting hole 8 of the sliding frame 7 are placed in a fitting relationship with play, so that there is no interference between the ridge lines 8a, 8b and the flat portions 2a, 2b. Therefore, no member or mechanism for fixing the restraining member 6 is required. Reference numeral 9 denotes a hand grip portion 1 which extends the horizontal rod 2 rearward and has its end fixed to the vertical rod 10.
1 is a normal hand hook attached to the tip of the vertical rod.

Further, in each figure, 12 is the cutting edge of the lid 3, 13 is the lid locking mechanism installed inside the lid, 14 is the release piece thereof, 15 is the lock part where the locking piece 16 is locked,
It is provided on the inner wall of the frame 17.

(Operation of the invention) When opening the lid 3 with the lid opening aid having the above structure, the tip hook 5 is inserted through the notch 12 of the lid 3 and locked in the locking part 4, and the holding member 6 is brought into contact with the top surface of the lid body 3, and the back side of the horizontal rod part 2 is brought into contact with the frame body 1.
7 and use it as a fulcrum to push down the handle part 9, pry open the lid 3 using the main support tool as a screw (dashed line in Figure 2), then pull the pried lid 3 to the side as it is, and remove the tip hook 5. You can pull it out using the hook. At this time, as a result of the edge of the lid body 3 trying to push down the restraining member 6, an upward force acts on the sliding frame 7, so that the ridge line 8a at the lower part of the front edge and the ridge line 8 at the upper part of the rear edge
a bites into the flat parts 2a and 2b of the horizontal rod part 2, respectively,
To prevent the lid body 3 from coming off.

(Effect of the invention) In the present invention, the pressing member 6 holds down the top surface of the lid 3 with the tip hook 5 hooking the lid 3, and in this state, the sliding frame 7 into which the pressing member 6 is loosely fitted is Ridge line 8
Since a and 8b are held by pressing against the flat parts 2a and 2b of the horizontal rod part 2, it is possible to pull the lid 3 out as it is after prying it open using the screw action of the auxiliary tool main body 1. Since the lid body 3 is held down from above, the series of operations from prying it open to pulling it out can be performed stably without the risk of the tip hook 6 and the holding member 4 coming off, making the opening operation very easy. This makes it possible to work stably throughout the entire operation.In particular, since the locking mechanism of the holding member 6 is not required, the structure is simplified and the handling is also easy. Since it has a structure in which only the restraining member 6 is provided on the portion 2, it is small and lightweight, and has remarkable practical effects such as good portability and ease of use.

[Brief explanation of the drawing]

The drawings show an embodiment of the opening aid for manhole covers according to the present invention, and FIG. 1 is a perspective view, and FIG.
The figure is a cross-sectional view of the lid open state, Figure 3 is a longitudinal cross-sectional view of the tip of the auxiliary tool, Figure 4 is a cross-sectional view of the sliding frame, Figure 5 is a cross-sectional view explaining the lid opening operation, and Figure 6 The figure is also a perspective view. DESCRIPTION OF SYMBOLS 1... Auxiliary tool main body, 2... Horizontal rod part, 3... Lid body, 4... Locking part, 5... Tip hook, 6... Holding member, 7... Sliding frame, 8... Play Fitting holes, 8a, 8b...
...A ridge line that presses into the upper and lower flat parts 2a and 2b so as to bite into them.

Claims (1)

[Scope of utility model registration request] At the tip of the horizontal rod part 2 of the auxiliary tool main body 1, a tip hook 5 that locks with the locking part 4 of the lid body 3 is provided, and a restraining member 6 that is in contact with the upper surface of the lid body 3 almost entirely is attached to its sliding frame. 7, which is loosely fitted so as to be movable back and forth, forming flat parts 2a and 2b on the upper and lower sides of the horizontal rod part 2, and a ridge line 8 in the loose fitting hole 8 that presses against the flat parts 2a and 2b.
An aid for opening manholes with shapes a and 8b.