JPH042202Y2 - - 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.

(Conventional technology) Conventionally, opening manhole covers has been a two-step operation in which the manhole covers are pried open with a crowbar or pry bar, and then pulled out with a hand hook. There are some devices with improved opening methods, but the purpose of these is to pry open the lid, and after that, it cannot be moved to the side or pulled out. Some lids are equipped with a locking mechanism, and it is also necessary to unlock them, which requires a more complicated operation. Therefore, the present inventor has continued to develop devices that can perform a series of tasks with a single auxiliary tool.

(Technical Problem) Therefore, the purpose of the present invention is to create a manhole cover that can be used to continuously perform operations such as unlocking, prying open the cover, and pulling out the cover using a single auxiliary tool, and which is also lightweight and easy to handle. The purpose of the present invention is to provide a lid opening aid.

(Technical Means) The present invention which achieves the above-mentioned object has a tip hook 3 which is inserted into a small opening 2 formed in the lids 1 and is locked to the lids 1, protruding from one end of the auxiliary tool main body 4 in a substantially L-shape. and a first step portion 6 that can be engaged with the member 5 that closes the small opening 2.
This is an opening aid for manhole covers that has a tip formed on the end of the main body behind the tip hook.

(Action of the invention) This auxiliary tool has a small opening 2 of the lid 1 at the tip of the main body.
Since the tip hook 3 is protruded in a substantially L-shape and is inserted into the lid 1 to lock it, if it has a closing member 5 facing the small opening 2, push it away and attach the tip hook 3. The closing member 5 is an operating member for locking the lids 1 to the lids 1 and opening the locking mechanism of the locked lids.
For the type that can be used for both purposes, it is possible to open the lock by operating the closing member 5 when inserting the tip hook 3 into the small opening 2, and furthermore, when the tip hook 3 is locked to the lid 1. , the fitting lid 1 is pried open and preparations for pulling it out are completed. At this time, by engaging the first step portion 6 with the closing member 5, the cover can be pried open and pulled out with stable operation, and a smooth opening operation can be performed.

(Embodiment) To explain with reference to the illustrated embodiment, the auxiliary tool body 4 has a straight rod shape, and has a diagonal portion 9 that is gently inclined backward with respect to the tip hook 3, and is approximately L-shaped forward from the tip. The tip hook 3 is made to protrude from the top, and the diagonal portion 9 and the tip hook 3 are formed to form an appropriate acute angle θ to facilitate the operation of prying open and pulling out. Note that the straight rod portion of the main body and the tip hook 3 are at approximately 90 degrees. The first step 6 is located at the lower end of the main body,
In the embodiment, the operating member 5 is formed by partially notching the rear end of the tip hook 3 and faces the small opening 2 when the tip hook 3 is locked in the locking groove 10 of the lid 1. (See Figure 6).
Reference numeral 11 indicates the engagement wall thereof, and reference numeral 12 indicates the top surface. The second stepped portion 8 provides a fulcrum when using the present aid, and also has the role of regulating the insertion amount of the tip hook.
In the embodiment, it is formed by providing a protrusion 13 above the first step 6 on the rear side of the main body, and the second step 8 is locked to the upper edge of the lid receiving frame 7 when prying it open. This makes it possible to apply a so-called lever. A handle 14 is provided at the other end of the straight rod-shaped main body 4, or, as illustrated in FIG. can be provided. If the second step 8 is not provided, the back surface of the main body is engaged with the upper edge corner of the frame and used as a fulcrum.

Figures 4 to 6, and Figures 7 and 8 show three typical examples of the structures of the lids 1 that are opened using the assisting tool of this invention and the frame 7 that supports them.
The latter two examples are equipped with a locking mechanism 17. 4 to 6, 18 is an arm with a member 5 for closing the small opening 2 attached to the tip, 19 is a shaft rotatably supporting the arm 18, and 20 is the rear end (inner end) of the arm 18. 21 is an arm mounting member,
22 is a mounting screw, and 23 is a recess provided on the inner surface of the frame for rotating the closing member 5. In this example, the tip hook 3 is inserted into the small opening 2 (Fig. 4), pushed in until the second step 8 is locked to the upper edge of the frame (Fig. 5),
Raise the tip of the tip of the tip hook 3 to lock it in the locking groove 10, and engage the first step 6 with the closing member 5 (Fig. 6).
At this time, the tip hook 3 engages with the closing member 5 to open the first
The top surface 12 of the stepped portion 6 transmits the pressing force, and the engagement wall 11
This prevents it from moving back, making the operation of prying it open and pulling it out more stable.

In the example shown in FIG. 7, a curved arm 18' having a closing member 5 is rotatably supported on a lock rod 24, and when the closing member 5 is pressed down, the curved protrusion 25 is brought into sliding contact with the support surface 26, and the lock is locked. The lock is opened by raising the rod 24, and when the lock is locked, the tip 24a is engaged with a protrusion 27 inside the frame. In addition, in the example shown in FIG. 8, an arm 18'' having a closing member 5 is pivotally supported on the lid body side, and the upper outer side of the hook member 28, which is pivotally supported so as to be able to engage with the protrusion 27, is placed near the end of the arm 18''. The lock is unlocked by retreating with a protrusion 29 provided on the arm, and when locking, a weight/regulating member 30 provided at the rear end (inner end) of the arm restricts the hook member 28 to the locked position. In the examples shown in FIGS. 7 and 8, the lock can be unlocked by inserting the tip hook 3 into the small opening 2 and pushing down the closing member 5 (the state shown in each figure).
With the second step portion 8 locked to the upper edge of the frame, the tip of the tip hook 3 is locked in the locking groove 10, and the closing member 5 is engaged with the first step portion 6 (sixth (same condition as shown in the figure), the lid 1 can be pried open and then pulled out.

(Effects of the invention) Therefore, according to the invention, operations such as unlocking, prying open, and pulling out the lid 1 can be performed continuously with one auxiliary tool, and even if there is no locking mechanism, the lid 1 can be opened and pulled out. Since the closing member 5 that closes the small opening 2 formed in the opening 2 is opened, a series of opening operations can be performed, which has the effect of making the opening operation extremely smooth. When prying open and pulling out the lids 1, the first step 6 engages with the closing member 5, which transmits force and prevents slipping, improves stability, and improves the frame. Since the auxiliary tool of the present invention can be locked using the body 7 as a fulcrum, a series of tasks can be carried out smoothly and safely without unnecessary force.

[Brief explanation of the drawing]

The drawings relate to the opening aid for manhole covers according to the present invention, and FIGS. 1 and 2 are perspective views of two embodiments, FIG. 3 is an enlarged perspective view of the main part, and FIGS. 4 and 5.
Fig. 6 is a sectional view showing an example of the lid opening state in three stages, and Figs. 7 and 8 are sectional views showing the lid opening operation state for two examples of manholes each having a different locking mechanism. . 1...Lids, 2...Small opening, 3...Tip hook, 4
... Main body of the auxiliary device, 5 ... Closing member, 6 ... First
7...frame body, 8...second step part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tip hook 3 that is inserted into a small opening 2 formed in the lids 1 and locked to the lids 1 is attached to one end of the auxiliary tool main body 4 by approximately L.
A member 5 that protrudes in a letter shape and closes the small opening 2.
A manhole cover opening aid in which a first step part 6 that can be locked with is formed at the end of the main body behind the tip hook. (2) The auxiliary tool main body 4 has a second hook that is locked to the upper edge of the lid receiving frame 7 when the tip hook 3 is inserted into the small opening 2.
The opening aid for manhole covers according to claim 1, which comprises a stepped portion 8 above the first stepped portion 6.