JP2991971B2 - Hand hook for iron lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook for an iron cover, and more particularly, to a hook for an iron cover which can easily open an iron cover with a locking device having no opening such as a hook hole. Things.

[0002]

2. Description of the Related Art Conventionally, a hand hook for an iron cover used when opening an iron cover fitted in a receiving frame is disclosed in JP-A-6-248.
No. 659 is disclosed. Hereinafter, this conventional hook will be described with reference to the drawings.

FIG. 12 is a cross-sectional view showing a state in which a conventional hook is inserted into a hook hole of an iron cover, FIG. 13 is a partial perspective view showing the iron cover having a hook hole, and FIG. FIG. 15 is a cross-sectional view showing a state in which a hook is inserted into a hook hole, rotated 90 °, and then pulled forward, and FIG. 15 is a cross-sectional view showing a state where unlocking and opening of an iron cover are conventionally performed by a hook. FIG.

A conventional hook A comprises an arm 1 and a protruding piece 2 projecting in a T-shape from the tip of the arm 1. In order to release the locking of the iron cover by the conventional hand hook A, the tip of the conventional hand hook A is inserted into the hand hook hole 4 formed in the iron cover 3 and having a shape as shown in FIG. Insert next,
As shown in FIG. 14, the conventional hand hook A is rotated 90 degrees around its axis.
° Rotate and pull toward you. As a result, the lock body 5 rotatably attached to the lower surface of the iron cover 3 is moved to the position shown in FIG.
5, the hook 5A formed on the lock body 5 is disengaged from the hook receiver 6A formed on the receiving frame 6, and the locking of the iron cover 3 is released. Since the length of the projection 2 of the conventional hand hook A is longer than the narrow width of the hand hook hole 4, the iron cover 3 is opened by pulling up the conventional hand hook A.

However, since the hook 4 is formed in the above-mentioned iron cover 3, there is a problem that pebbles, sand and the like enter the manhole from the hook 4. Therefore, the present inventors have developed an improved locking device that does not require opening an opening such as a hook hole in an iron lid. Hereinafter, this improved locking device will be described with reference to the drawings.

FIG. 4 is a perspective view showing an improved locking device, FIG. 5 is a partial perspective view showing an iron cover to which a lock body in the improved locking device is attached, and FIG. 6 is a lock body in the improved locking device. FIG. 7 is a perspective view of FIG.
It is a line sectional view.

[0007] In FIGS. 4 to 7, reference numeral 7 denotes a peripheral wall 7.
A receiving frame in which a hook receiver 7B to which a hook of a lock body described later is engaged is formed on the inner surface of A. Hook receiver 7B
Is inclined such that a hook 9C of a lock body 9 described later is slippery. Reference numeral 8 denotes an iron cover fitted into the receiving frame 7.

Reference numeral 9 denotes a lock body. Lock body 9
Is rotatably attached to the lower surface of the peripheral portion of the iron cover 8 in a plane orthogonal to the iron cover 8 around the shaft support 9A. The lock body 9 has a weight portion 9B and a hook 9C at a lower portion, and has a pressing portion 9D below the shaft supporting portion 9A. The pressing portion 9D is exposed from the peripheral wall 8A of the iron cover 8, and when the pressing portion 9D is pressed, the lock body 9 moves around the shaft supporting portion 9A so that the hook 9C is disengaged from the hook receiver 7B of the receiving frame 7. Rotate. The pressing portion 9D includes the iron lid 8
Are not visible from the outside when fitted in the receiving frame 7. When no external force is applied to the lock main body 9, the lock main body 9 rotates by its own weight in the direction in which the hook 9C engages with the hook receiver 7B around the shaft support 9A. The central portion of the lock body 9 is configured such that when the lock of the iron cover 8 is released, the lock body 9 rotates when the lock body 9 rotates.
Is a space so as not to hit a concave portion described later.

Reference numeral 10 denotes a concave portion formed on the upper surface of the iron cover 8 above the lock body 9. The recess 10 has a hook 10A for opening the iron lid 8. Since the recess 10 is formed in a bag shape, pebbles, sand, and the like do not enter the manhole.

The above-mentioned improved locking device has the following advantages. In a state where the iron cover is fitted into the receiving frame, the pressing portion of the lock main body is not visible from the outside, so that there is no possibility that the iron cover is easily opened by an unspecified person.

[0011] Since the concave portion for engaging the hook does not penetrate the iron cover, the hermeticity of the manhole is good,
Pebbles and sand do not enter the manhole. Since pebbles, sand, and the like do not enter the manhole, the hook of the lock body remains detached from the hook receiver of the receiving frame, and there is no danger that the iron lid will not be locked.

[0012]

However, in order to open the iron cover 8 using the above-mentioned conventional hook A, the conventional hook A is engaged with the engaging portion 10A of the recess 10 and the iron cover 8 is opened. After pulling up the iron cover 8, it is necessary to press the pressing portion 9 </ b> D of the lock body 9 exposed on the peripheral wall of the iron cover 8 with another jig to release the locking of the iron cover 8. That is, conventionally, in order to open the iron lid 8 using the hook A, it was necessary to use two kinds of jigs and to operate it by two people.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a hook for an iron lid which can easily open an iron lid with a locking device having no opening such as a hook hole.

[0014]

According to the first aspect of the present invention,
A hand hook for an iron cover used when opening an iron cover fitted in a receiving frame of a manhole, an arm, a fixed hook attached to a tip of the arm, and a rotatable attachment to a tip of the arm. The fixed hook has a distal end curved in a U-shape toward the distal end of the rotary hook, and the distal end of the fixed hook is provided on an upper surface of the iron lid. It is characterized in that a projection engaging with the portion is provided.

The invention according to a second aspect is characterized in that the arm is bent in the shape of a letter on the side of the fixed hook, and the arm is provided with a handle at right angles to the arm. Have

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a hook for an iron lid according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a hook for an iron lid of the present invention, FIG. 2 is a side view showing a hook for an iron lid of the present invention, and FIG. 3 is a rear view showing a hook for an iron lid of the present invention. It is.

As shown in FIGS. 1 to 3, an iron lid hand hook B of the present invention includes an arm 11, a fixed hook 12 attached to the tip of the arm 11, and a shaft support 13 A at the tip of the arm 11. And a rotation hook 13 rotatably mounted as a center. The arm 11 is bent in a V-shape toward the fixed hook 12 side. On the upper part of the arm 11, a grip handle 15 is provided at right angles to the arm 11. The tip of the fixed hook 12 is curved in a U-shape toward the tip of the rotating hook 13. A protruding piece 14 that engages with the engaging portion 10 </ b> A of the
Are provided in a T-shape.

A method of opening the iron lid by the iron hook of the present invention configured as described above will be described with reference to the drawings. FIG. 8 is a cross-sectional view showing a state in which the turning hook of the hook of the present invention is engaged with the engaging portion of the concave portion in the improved locking device, and FIG. 9 raises the iron lid by the hook of the present invention. FIG. 10 is a cross-sectional view showing a state in which the lock body of the improved locking device is rotated by the hook of the hook of the present invention to unlock the iron cover, and FIG. It is sectional drawing which shows the state which lifted the iron cover from which locking was released by the hook of this invention.

First, to open the iron cover 8, as shown in FIG. 8, the turning hook 13 of the hand hook B of the present invention is engaged with the engaging portion 10A of the concave portion 10 of the iron cover 8. Rotating hook 1
3 rotates freely around the shaft support 13A,
It easily penetrates into the recess 10. At this time, the tip of the fixed hook 12 of the hook H is applied to the receiving frame 7.

Next, as shown in FIG. 9, the handle 15 of the hook B is grasped with a hand, and it is turned forward (to the left in the figure). Thus, the iron lid 8 is lifted up with the tip of the fixed hook 12 as a fulcrum, and a gap is formed between the iron lid 8 and the receiving frame 7. The hook B is easy to operate because the arm 11 is bent in a U-shape. Further, when the hook B is lowered, the fixing hook 12 is moved to the iron lid 8.
Of the lock body 9 is pressed. As a result, as shown in FIG.
Rotates about the shaft support 9A. Thus, the hook 9C of the lock body 9 comes off the hook receiver 7B of the receiving frame 7, and the locking of the iron cover 8 is released. Thus, when the locking of the iron cover 8 is released, the hand hook B is further lowered as shown in FIG. As a result, the iron cover 8 is completely
, The iron lid 8 can be opened.

On the other hand, to lock the iron cover 8, the iron cover 8 is fitted into the receiving frame 7. The lock body 9 rotates around the shaft support 9A over the hook receiver 7B, but then rotates in the opposite direction by its own weight, and the hook 9C is naturally located below the hook receiver 7B. by this,
The iron lid 8 is locked.

[0022]

As described above, according to the present invention, there is an industrially useful effect that an iron cover with a locking device having no opening such as a hook hole can be easily opened by one person. Brought.

[Brief description of the drawings]

FIG. 1 is a front view showing a hook for an iron lid according to the present invention.

FIG. 2 is a side view showing a hook for an iron lid according to the present invention.

FIG. 3 is a rear view showing the hook for an iron cover of the present invention.

FIG. 4 is a perspective view showing an improved locking device.

FIG. 5 is a partial perspective view showing an iron lid to which a lock body is attached in the improved locking device.

FIG. 6 is a perspective view showing a lock body in the improved locking device.

FIG. 7 is a sectional view taken along line AA of FIG. 4;

FIG. 8 is a cross-sectional view showing a state in which the turning hook of the hand hook of the present invention is engaged with the engaging portion of the concave portion in the improved locking device.

FIG. 9 is a cross-sectional view showing a state where the iron lid is lifted by the hook of the present invention.

FIG. 10 is a cross-sectional view showing a state in which the lock main body in the improved locking device is rotated by the hand hook fixing hook to unlock the iron cover.

FIG. 11 is a cross-sectional view showing a state where the unlocked iron lid is lifted by the hook of the present invention.

FIG. 12 is a cross-sectional view showing a state in which a conventional hook is inserted into a hook hole of an iron cover.

FIG. 13 is a partial perspective view showing the iron lid having a hook hole.

FIG. 14 is a cross-sectional view showing a state in which a conventional hook is inserted into a hook hole, rotated by 90 °, and then pulled forward.

FIG. 15 is a cross-sectional view showing a state where unlocking and opening of an iron cover are conventionally performed by a hook.

[Explanation of symbols]

 1: Arm 2: Projection piece 3: Iron cover 4: Hand hook hole 5: Lock body 5A: Hook 6: Receiving frame 7: Receiving frame 7A: Peripheral wall 7B: Hook receiver 8: Iron lid 8A: Peripheral wall 9: Lock body 9A: Shaft Support 9B: Weight 9C: Hook 9D: Pressing part 10: Depressed part 10A: Engagement part 11: Receiving frame 12: Fixed hook 13: Rotating hook 13A: Shaft support 14: Protrusion 15: Handle handle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 6-56154 (JP, U) JP-A 58-149454 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/12

Claims (2)

(57) [Claims] A hand hook for an iron cover used when opening an iron cover fitted in a receiving frame of a manhole, an arm, a fixed hook attached to a tip of the arm, and a pivot about the tip of the arm. The fixed hook has a tip bent in a U-shape toward the tip of the pivot hook, and the tip of the pivot hook has an upper surface of the upper surface of the iron lid. A hook for an iron lid, wherein a projection is provided for engaging with the engaging portion. 2. The arm according to claim 1, wherein the arm is bent in a U-shape toward the fixed hook, and the arm is provided with a handle at right angles to the arm. Hand hook for iron lid.