JPH0248510Y2 - - 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) For example, conventionally, a crowbar or pry bar is often used to open a manhole iron cover that does not have a hinge structure, and in that case, a two-step operation is required to pry open the cover, then change your grip, and then slide it open. It was hot. Sho 1
Although there were devices that opened the lid in stages, they were heavy and large, making them difficult to handle.

(Technical Problem) Therefore, the present invention is capable of performing the lid-opening operation of prying open the lid on one side and subsequently pulling the lid to the pried-open side using a single auxiliary tool, without changing the grip. Even if there is no hand hook hole or if it is clogged with dirt, etc., the lid can be opened using the three crowbar holes or other cutouts on the periphery of the lid, and it is also highly portable. The present invention provides an aid for opening manhole covers.

(Technical means) The present invention which achieves the above object has three connecting parts 2, 3, and 4 on the connecting member 1, and one connecting part 2 has a pry rod 6 hooked thereon to pry open the lid 5. A locking body 8 that locks with the part 7 is provided in series, and a tip hook 10 that locks with a notch edge 9 provided on the periphery of the lid body 5 is provided at the end of the pry rod 6 near the hook part 7. Furthermore, hooks 13 and 14 are attached to the remaining two connecting portions 3 and 4, respectively, for engaging the other notch edges 11 and 12 of the lid body 5.

(Example) The connecting member 1 in the illustrated embodiment has three branch rods 2, 3, and 4 branched at equal intervals as connection portions, and one of the branch rod connection portions 2 is provided with a locking member. 8 is provided so that the length can be adjusted. The locking body 8 has a side surface approximately L.
A substantially U-shaped locking rod 15 that locks with a hook 7 protruding upward near the tip of the pry rod 6, and a nut 1 provided between a pair of band rods 16, 16 that extend the locking rod 15.
7 and a male threaded rod 18 provided at the tip of the branch rod 2, and by turning the locking rod 15 with it removed from the hook 7, the length of the locking body 8 can be adjusted. Therefore, the same lid opening aid can be used appropriately for lids 5 having different diameters. 1
Reference numeral 9 indicates a retaining metal fitting fitted to the hanging portion 7 of the pry rod 6, and 7a further indicates a protrusion for preventing the retainer from coming off. The retaining fitting 19 has a width and length that allows it to pass through the substantially U-shaped locking rod 15. If an inclined hook 7' is provided in place of the hook 7, the metal fitting 19 can be omitted. Each pry rod 6 has a handle portion 20 at its corner, and has a hook 10 at its tip that engages with a cutout edge 9 such as a pry hole provided on the periphery of the lid.

Then, a chain or other sturdy extension member 22 is attached to the remaining two connecting portions 3 and 4 through a connecting ring 21 in the tip holes 3a and 4a, respectively, and a chain or other sturdy extension member 22 is attached to the tip of the connecting portion 22 through another connecting ring 23. Hooks 13 and 14 are provided to hook onto edges 11 and 12 of cutouts such as other prying holes provided on the periphery of the lid body 5. In addition, for a lid body without a hand hook hole or a manhole with a tapered structure in which a tapered receiving frame receives the tapered surface of the lid circumference, it is common to provide three so-called crow holes (pry holes) on the circumferential surface of the lid body 5. Also, since it is appropriate from the viewpoint of force, the hooks 10 and 2 at the tip of the pry rod are also used in the present invention.
The hooks 13 and 14 are hooked or forced into the lid body 5 using those holes. Also, Kakegaku 13,1
As illustrated in FIG. 3, the length of 4 is such that attachment/detachment tools consisting of a U-shaped rod 24 and an eye bolt 25 are interposed between the connecting ring 21 and the chain-like extension member 22, and between this member 22 and the other connecting ring 23, respectively. This allows easy adjustment and corresponds to the diameters R ₁ , R _{2 .} . . of the lid body 5.

In the case of opening the lid, first lock the tip hook 10 of the pry rod 6 into the notch edge 9 of the pry hole etc. of the lid body 5, and then
While hooking the hooks 13 and 14 on the other two notch edges 11 and 12 of the lid body 5, the locking body 8
If the length is appropriate, hook the locking rod 15 onto the hook 7 (solid line in Figure 4), and then push down the pry rod 6 with its tip to release the frame that supports the lid 5. The inner edge of the body 24 serves as a fulcrum and the tip hook 10 serves as a point of action to pry up the lid body 5, and while pulling the pry rod 6, push the tip deep into the pry hole to level it (solid line in Figure 5). , just slide the lid 5 up onto the frame 24 and pull it out further (imaginary line in the figure).

(Operations and Effects of the Invention) As described above, the present invention attaches the pry rod 6 to one connecting portion 2 of the communication member 1 via the locking body 8,
Since the hooks 13 and 14 are attached to the other two connecting portions 3 and 4, the notch edges 9 and 1 of the lid body 1 are
Preparation is completed by simply hooking the three hooks 10, 13, and 14 on 1 and 12 and attaching the locking body 8 to the pry bar 6. In addition, the three connecting parts 2, 3, 4 of the connecting member 1
and the three hooks 10, 13, 14 can be connected by the method described in the embodiment or any other arbitrary method, and since they are not fixed, the three hooks 10, 13,
14, the lid body 5 can be moved freely relative to the communication member 1.
Since there is room for adjusting the length of each connecting portion, it is possible to easily accommodate differences in the size of the lid body 5.

Therefore, according to the present invention, the lid can be opened by simply hooking the hooks 13 and 14 onto the lid body 5 using the notch edges 11 and 12 and engaging the tip hook 10 of the pry rod 6 into the other notch edge 9. The preparation is as simple as using a single crowbar or pry bar, and the work of prying open one side of the lid 5 with the pry rod 6 and pulling it out can be done smoothly in one step. It is effective, and the three notched edges 9, 11, and 12 make it easy to open the lid even if there is no hand hook hole or if it is clogged with dirt, etc., and the assisting device itself is different from conventional ones. Since it can be made as small as a pry tool, it is very portable.

[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 shows the separated overall view, Fig. 2 shows a side view of a modified example of the hook, and Fig. 3 shows the length of the hook. A plan view showing the adjusting means, and FIGS. 4 and 5 are perspective views of the adjusting means in use. 1... Connection member, 2, 3, 4... Connection part, 5...
... Lid body, 6 ... Pry rod, 7 ... Hanging part, 8 ... Locking body, 9, 11, 12 ... Notch edge, 10 ... Tip hook, 13, 14 ... Hanging hook.

Claims (1)

[Scope of utility model registration request] The connecting member 1 is provided with three connecting portions 2, 3, and 4, and one of the connecting portions 2 is connected to a locking body 8 that locks with a hanging portion 7 of a pry lever 6 for prying open the lid 5. A tip hook 10 is provided at the end of the pry rod 6 near the hanging portion 7 to engage the notch edge 9 provided on the periphery of the lid 5, and the remaining two connecting portions 3, 4 are provided. A manhole cover opening aid comprising hooks 13 and 14 which are respectively attached to other notch edges 11 and 12 of a cover body 5.