JPH011890A - ladder hook - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ladder hook that is attached to the top of a ladder used for work at heights.

[Conventional technology]

Traditionally, when working at heights such as overhead line construction and repair work, ladder hooks were used, and the hook at the top was hung on a strand suspended in the air to prevent the ladder from tipping over. . However, conventional hooks were easily detached from the strand due to vibrations, which was extremely dangerous, so a highly secure ladder hook with a stopper that uses a spring to hold the hook in the closed state when hooked onto the strand has been developed. This was proposed in Japanese Utility Model Application Publication No. 61-11898.

[Problem that the invention seeks to solve]

However, the ladder hook proposed in the above-mentioned Japanese Utility Model Publication No. 61-11898, etc., releases the stopper against the elasticity of the spring by pulling the release lobe when moving the work place or removing the hook from the strand at the end of the work. The hook is rotated inward to release and remove the hook, but the release lobe cannot be loosened and the release rope is pulled with one hand, or the release rope is tied to the side rung of a ladder. It is necessary to remove it while preventing loosening, which results in poor workability and complicated handling.

Furthermore, if the lower strand becomes loose when the hook is hooked to a double-track strand, the lower strand will prevent the stopper from rotating inward, making it impossible to remove the hook. Because of this, it was often not possible to use it for double-track strands.

The present invention allows the stopper to be freely opened by simply pulling the release rope once when removing the hook, and does not require any operation when hanging on the strand, and the hook is automatically kept in the closed state by the stopper. so that
The object of the present invention is to provide a ladder hook that is easy to use even on double track strands and has high workability and safety.

[Means for solving problems]

The present invention provides a ladder hook in which a leg portion of a hook on which a strand or the like in the air can be hung is fixed to the top portion, and a stopper is provided on the leg portion to rotate around a spindle to open and close the hook. The hook is rotatable in the inward and outward directions, and a spring urges the outward rotation of the hook, and a locking portion is formed on the lower surface of the stopper, and the hook is rotatable about a support shaft adjacent to the stopper. , a rotating piece is provided which is always biased toward the stopper by a spring and is engaged with the locking portion of the stopper to prevent the stopper from rotating outward from the hook closed position, and the rotating piece is attached with a spring. This ladder hook is characterized by a release rope connected thereto for rotation against the elasticity of the ladder hook.

〔Example〕

One embodiment of the present invention will be described with reference to the drawings.
is a hook equipped with a hook receiver 3 that can be attached to the top of the ladder body A with a fitting 2 such as a bolt, and the material thereof can be any suitable material, but is preferably made of aluminum pipe material. Then, the bent part is often covered with rubber,
It is preferable to provide an elastic and insulating coating 4 made of synthetic resin or the like. The hook receiver 3 is, for example, U-shaped as shown in the figure, and its vertical side 5 is attached near the top of the ladder body A, and the leg portion 7 of the hook 1 is attached to the horizontal portion 6.
It is an insert. A rotation preventing member 8 made of synthetic resin or the like and having a square or other polygonal cross section is provided at the insertion portion of the leg portion 7 of the hook 1 into the hook receiver 3, and prevents rotation of the insertion hole of the hook receiver 3. It has a shape that matches the member 8, and a spring 9 is provided between the lower surface of the rotation stopper member 8 and the lower horizontal portion of the hook receiver 3, so that the fitting between the hook receiver 3 and the rotation stopper member 8 is always maintained. ing.

The rotation stopper 8 is made of nylon or other synthetic resin, and the hook 1 is formed when the synthetic resin is molded and solidified.
It is preferable to protrude and fix to the outer periphery of the leg portion 7 and integrate it.

□ Also, a bracket lO is fitted into the leg part 7 of the hook 1 and fixed with a bolt 11, and the bracket lO is provided with a mechanism that rotates in and out of the hook 1 around a support shaft 12 to open and close the hook 1. A spring 14 is attached to the support shaft 12 to urge the stopper 13 to rotate outward from the hook l, and the bottom surface of the stopper 13 is provided with a rotating piece 18, which will be described later. Notch 1 that becomes the locking part where the
5 is formed.

Further, it rotates around a support shaft 16 adjacent to the lower part of the stopper 13, is always urged toward the stopper 13 by a spring 17 attached to the support shaft 16, and is locked in a notch 15 of the stopper 13. A rotating piece 18 that prevents the stopper 13 from rotating outward from the hook closed position (FIG. 1)
The rotating piece 18 is provided with a release rope 1 for rotating the rotating piece 18 in the opposite direction against the elasticity of the spring 17.
9 is connected.

20 is a cap, 21 is a fitting, 22 is a bending metal fitting, B is a side rung of ladder body A, and S is a strand.

When using the hook 1, the hook 1 is hung on the strand S stretched in the air, but the stopper 13 is only brought into contact with the strand S, and the stopper 13 rotates inward of the hook L, as shown by the chain line in Figure 3. ), after guiding the strand S into the bent part of the hook 1, the stopper I3 is returned by the elasticity of the spring 14, but the rotating piece 18 biased in the direction of the stopper 13 is locked in the notch 15 of the stopper 13. As a result, the stopper 13 is prevented from rotating outward from the closed position of the hook 1.
The work can be carried out safely without coming off the strand S.

Next, when removing the ladder body A from the strand S, by pulling down the release row 119, the rotating piece 18 is released from the spring 17.
The rotating piece 18 rotates against the 0 elastic force and comes off the notch 15 of the stopper 13, releases the release row 119, and the rotating piece 18 releases the stopper 1.
Even if the stopper 13 is in contact with the strand S, the locking by the notch 15 is released, so if the ladder body A is lifted upward, the stopper 13 will be pushed by the strand S and will rotate outward (the third ), the hook 1 can be easily removed from the strand S.

In this way, when using the ladder hook of the present invention, simply hang the hook 1 on the strand S, the stopper 13 rotates inward of the hook 1, stores the strand S in the hook 1, and then the stopper 13 is spring 14
The stopper 13 is held in the hook closed position by the engagement of the rotating piece 18 while being returned by the hook, and does not come off, improving work safety. Even if you release the release rope 19 by simply releasing the latching of 18 to the stopper 13, if you lift the ladder, the pressing force of the strand S will release the stopper 1.
3 is opened by rotating outward of the hook 1, and the hook can be easily removed even if it is a double-wire strand, improving workability.

If the installation angle of the hook 1 interferes with the work (for example, when hanging on a strand stretched at right angles), push down the leg part 7 of the hook 1 against the elasticity of the spring 190, and then rotate it. If the rotation stopper 8 has a square cross section, rotate it 90 degrees, and release the hand to release the spring 9.
By this action, the hook receiver 3 can be fitted into the rotation stopper member 8 and held in a 90 degree rotated state, and can be modified to facilitate the work depending on the tensioning condition of the strand.

〔Effect of the invention〕

As described above, according to the present invention, when in use, the strand is stored in the hook simply by hanging the hook on the strand, the hook is kept closed and does not come off, and can be removed by simply pulling down the release rope once. Even with double-track strands, it can be operated with both hands, greatly improving safety and workability.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the vicinity of the hook portion, FIG. 2 is a front view of the vicinity of the hook portion, FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 4 is a side view of the vicinity of the hook portion. FIG. 5 is a side view of the device in use, and FIG. 5 is a front view thereof. 1...Hook, 2.21...Mounting tool, 3...Hook receiver, 4...Coating, 5...Vertical side part, 6...Horizontal part, 7... Leg part , 8... rotation stopper member, 9, 14.
17... Spring, 10... Placket, 11.
... Bolt, 12.16... Support shaft, 13... Stopper, 15... Notch, 18... Rotating piece, 19...
Release rope, 20...Ki+knob~22...Bending metal fitting, A...Ladder body, B...Mechanism, S...Strand. Patent applicant Nippon Telegraph and Telephone Corporation Patent applicant Nakao Co., Ltd. Patent applicant Daito Denzai Co., Ltd. Patent applicant Tokyo Tsushin Kozai Co., Ltd. Representative patent attorney Minoru Yakushi, Representative patent attorney
1) Takatsugu Department Patent Attorney Masayuki Takagi Figure 4 Figure 5

Claims (1)

[Claims] (1) A ladder hook in which a leg of the hook on which a strand, etc. can be hung in the air is fixed at the top, and the leg is equipped with a stopper that rotates around a spindle to open and close the hook, and the stopper is attached to the hook. The hook is rotatable in the inward and outward directions, and a spring urges the outward rotation of the hook, and a locking portion is formed on the lower surface of the stopper, and the hook is rotatable about a support shaft adjacent to the stopper, A rotating piece is provided which is always biased toward the stopper by a spring and engages the locking portion of the stopper to prevent the stopper from rotating outward from the hook closed position. A ladder hook characterized by connecting a release rope for rotation against elasticity.