JPH0248511Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to 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. Further, since the lid is only subjected to clamping pressure from above and below, it cannot be moved laterally or pulled out, and a separate lid-opening tool is required for this purpose.

(Technical Issues) Therefore, the present invention is capable of prying and pulling out the lid with one auxiliary tool.
To provide a manhole cover opening aid that can be easily and securely attached to a cover body and is suitable for carrying.

(Technical Means) In order to achieve the above-mentioned object, the present invention attaches a restraining member 4 that contacts the top surface of the lid body 3 to the horizontal rod portion 2 of the auxiliary tool body 1 so as to be movable back and forth, and attaches it to the bottom edge of the lid body 3. A tip hook 6 that engages the protruding hanging edge 5 is formed on the horizontal rod portion 2, and a locking mechanism 7 that fixes the restraining member 4 at a position where the lid body periphery is clamped together with the tip hook 6 is formed on the horizontal rod. It is provided in section 2.

(Example) The auxiliary tool main body 1 in the illustrated example has a side surface approximately L.
The horizontal rod portion 2 at the lower end is formed into a square cross section and has a hook 6 at its tip. The restraining member 4 is fitted into the horizontal rod portion 2 so as to be movable back and forth on the horizontal rod portion 2, and
Moreover, it is tilted forward so as to be in stable contact with the lid body 1. 8 is a fitting frame portion provided at the base of the restraining member 4; 9 is a square hole formed in the frame portion 8 to prevent rotation of the restraining member 4; 10 is a window hole in the restraining member 4; 11 is a restraining member 4; 12 is a locking pin that fits into the elongated hole 13 and the vertical hole 14 and moves up and down within the range of the elongated hole 13; 15 is a horizontal rod for fitting the lower end of the pin 2; In the embodiment shown in FIGS. 1 to 3, the L-shaped piece and the lock hole 15 constitute the lock mechanism 7, which is a lock hole provided on the upper surface of the part 2.

A modification of the lock mechanism 7 illustrated in FIGS. 4 and 5 is a lock arm 1 having a latch 17 on a pair of shaft support pieces 16, 16 provided on the upper surface of the base of the horizontal rod portion 2.
8 is fixed at the base end by a shaft 19, and the latch 17 has a structure that engages with a fitting groove 20 on the upper surface of the horizontal rod part and prevents the pressing member 4 from retreating with its front surface 21.
In the one shown in FIGS. 7 and 7, a rising piece 22 is provided at the base of the restraining member 4, and a rotating engagement piece 24 having a substantially L-shaped side surface is supported by a shaft 23, and its tip 25 is attached to the horizontal rod part 2. Lock mechanism 7 that engages and disengages from the formed horizontal groove 26
This is an example of configuring . In either case, a locking mechanism 7 is provided at a position where the periphery of the lid body can be clamped and fixed between the restraining member 4 and the tip hook 6, and the restraining member 4 does not necessarily have to be square, but is placed on the top surface of the lid body. The shape should be stable.

The tip hook 6 is inserted into the lower surface of the lid body through a pry hole 27 formed on the periphery of the lid body 3 into which a crowbar or pry bar can be inserted, and is inserted into the lower surface of the lid body through a hanging edge 5 formed on the lower surface.
It is hung on. In each figure, 28 is a handle portion provided on the auxiliary tool main body 1, and 29 is a frame body for receiving the lid body 3.

To open the lid, first insert the tip hook 6 of the horizontal bar 2 through the pry hole 27 and hook it on the hanging edge 5, operate the locking mechanism 7 to clamp the periphery of the lid, and then press the top of the frame 29. Using the edge as a fulcrum, use the main support tool as a screw to pry it open (dashed line in Figure 2), then pull it to the side,
All you have to do is pull out the lid body 3 hooked with the tip hook 6.

(Operations and Effects of the Invention) In the present invention, the pressing member 4 presses down the top surface of the lid 3 while the tip hook 6 is hooked, and this state is held by the locking mechanism 7. After the lid 3 is pried open by the screw action of the tool body 1, it can be pulled out as it is, and the lid 3 is held down from above and below, so the operation from prying open the lid 3 to pulling it out can be done using the tip hook. This can be done stably without the risk of the 6 and the restraining member 4 coming off.

Therefore, according to the present invention, it is possible to pry open and pull out the lid body 3 with a single lid opening aid, and to perform these operations in a series, so that the lid opening operation can be performed very smoothly, and the operation can be performed stably throughout the entire operation. In addition, it is possible to easily open manhole covers with no hand hook holes on the surface to prevent rainwater from entering, or manhole covers with only bag-shaped pry holes. Since it has a structure in which the holding member 4 and its locking mechanism 7 are provided in the holding member 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; FIG. 1 is a partially omitted perspective view, FIGS. 2 and 3 are side views of the manhole cover in an open state, and FIG. 4 is a side view of the manhole cover opening aid. is a perspective view of a modified example of the lock mechanism, FIG. 5 is a side view thereof, FIG. 6 is a perspective view of another modified example of the lock mechanism, FIG. 7 is a side view thereof, and FIG. 8 is an attachment to the lid body. FIG. 3 is a perspective view showing the situation. DESCRIPTION OF SYMBOLS 1...Auxiliary tool main body, 2...Horizontal rod part, 3...Lid body, 4...Retaining member, 5...Drooping edge, 6...Tip hook, 7...Lock mechanism.

Claims (1)

[Scope of utility model registration request] A restraining member 4 in contact with the upper surface of the lid body 3 is attached to the horizontal rod portion 2 of the auxiliary tool main body 1 so as to be movable back and forth, and a tip hook is attached to a hanging edge 5 protruding from the lower surface edge of the lid body 3. 6 is formed on the horizontal rod portion 2, and a restraining member 4 is formed at a position where the peripheral edge of the lid body is held together with the tip hook 6.
This lid opening aid is provided with a locking mechanism 7 on the side rod part 2 for fixing the lid.