JP4592657B2 - Ladder hook - Google Patents

Description

  The present invention relates to a ladder hook in which a hook is attached to the top of a ladder used for high-altitude work such as overhead wire work and repair work such as electric wires.

As a conventional ladder hook, for example, there is one described in Patent Document 1. This ladder hook is capable of attaching the base end side leg portion of the hook body formed in a substantially inverted U shape with the base end side leg portion, the tip end side leg portion and the bent portion to the top portion of the ladder column, The base end of the stopper piece that closes the opening of the hook body is pivotally attached to the lower end of the base end side leg, and the one end side of the stopper piece can always rotate only inward of the hook by a spring. The hook closed state is maintained, and the other end of the stopper piece is connected to a release rope that releases the hook closed state by rotating the stopper piece against the biasing force of the spring to the inside of the hook. In use, hooks are hung on strands that are stretched in the air so that the ladder can be prevented from falling down.
Japanese Utility Model Publication No. 61-11898

  In the ladder hook of the above-mentioned Patent Document 1, since the stopper piece is rotated inwardly of the hook, a strand or the like is caught on the tip of the stopper piece, which makes it difficult to remove the hook. There is a problem that workability deteriorates.

  An object of the present invention is to provide a ladder hook in which a strand or the like is not caught on the tip of a stopper piece, the hook can be easily removed, and workability can be improved.

  Means for solving the above-described problems will be described with reference numerals in the embodiments described later. A ladder hook 1 according to the first aspect of the present invention includes a proximal end leg 3, a distal end leg 4, and The base end side leg portion 3 of the hook main body 2 formed in a substantially inverted U shape with the bent portion 5 can be attached to the top of the pillar A of the ladder A, and the opening portion of the hook main body 2 is formed at the lower end portion of the front end side leg portion 4. The base end of the stopper piece 7 that closes 6 is pivotally attached, and the lower end of the base end side leg 3 has a stopper engaging portion 8 at one end facing the opening 6 of the hook body 2 and the other end. This is a ladder hook formed by pivoting a swing lever 10 having a stopper release rope 9 attached to the side, and the stopper piece 7 is always locked by a spring 14 at its distal end 7a. It is held in such a posture that it can be released downward from the portion 8 and the opening 6 of the hook body 2 can be opened. The front end portion 7 a is locked from above with respect to the stopper locking portion 8, so that the hook body 2 is held in a closed posture for closing the opening 6 of the hook body 2, and the swing lever 10 is held in a horizontal posture by a spring 16. So that the tip 7a of the stopper piece 7 is released downward from the stopper locking portion 8 and the opening 6 of the hook body 2 is opened by pulling the stopper releasing rope 9 downward. It is characterized by that.

  According to a second aspect of the present invention, in the ladder hook according to the first aspect, an end surface 8o of the stopper locking portion 8 facing the opening 6 of the hook body 2 is formed in a tapered surface and is downward from the stopper locking portion 8. By pushing up the tip end portion 7a of the stopper piece 7 in the state of being detached toward the end along the tapered surface 8o, the swing lever 10 swings against the spring 16 and the tip end portion 7a of the stopper piece 7 swings. The lever 10 is configured to be locked to the stopper locking portion 8.

  According to a third aspect of the present invention, in the ladder hook according to the first or second aspect, a hook mounting bracket 11 is provided on the base end side leg portion of the hook main body 2, and the base end side leg of the hook main body 2 is provided by the hook mounting bracket 11. The part 3 is detachably attached to the top of the column P of the ladder A.

  According to a fourth aspect of the present invention, in the ladder hook according to the third aspect, the hook mounting bracket 11 is formed in a U shape by the vertical horizontal pieces 17a and 17b and the vertical piece 17c, and the hook main body 2 is formed on the vertical horizontal pieces 17a and 17b. A hook receiver 17 that is fitted to the base end side leg 3 of the base plate and is non-rotatable, and a mounting bracket 18 that is connected to a vertical piece 17c of the hook receiver 17 and is detachably attached to the top of the column P of the ladder A. The mounting bracket 18 is formed in an L shape by a first plate portion 22a connected to the vertical piece 17c of the hook receiver 17 and a second plate portion 22b vertically connected from one end thereof. It consists of an L-shaped main body 22 that fits to the two adjacent side surface portions a and b of the ladder column P, and a rotating plate 24 pivotally attached to the distal end portion of the second plate portion 22b. The L-shaped main body 22 is connected to two side surfaces a adjacent to the ladder support P, In the state where the rotating plate 24 is applied to the side surface portion c of the ladder support P on the side facing the first plate portion 22a of the L-shaped main body 22 and the ladder support P is gripped, The front end portion of the first plate portion 22a and the free end portion of the rotating plate 24 are fastened by a fastening bolt 25 so that the top end portion of the ladder column P is held and fixed. .

  The effect of the invention by the above-described solution means will be described with reference numerals in the embodiments described later. The ladder hook 1 according to the first aspect of the present invention includes a proximal leg portion 3, a distal leg portion 4, and a bent portion. The base end side leg 3 of the hook body 2 formed in a substantially inverted U shape with the portion 5 can be attached to the top of the pillar A of the ladder A, and the opening 6 of the hook body 2 is formed at the lower end of the front end side leg 4. The base end of the stopper piece 7 is closed, and the bottom end of the base side leg 3 has a stopper locking portion 8 at one end facing the opening 6 of the hook body 2 and the other end. A hook formed by pivoting a swing lever 10 having a stopper release rope 9 attached thereto, and the mounting structure of the swing lever 10 and the mounting structure of the stopper piece 7 are the base end side leg 3 of the hook body 2. And the front leg portion 4, the mounting structure is simplified and parts can be easily replaced. .

  In this hook 1, the stopper piece 7 is always in a posture in which the distal end 7 a can be released downward from the stopper locking portion 8 of the swing lever 10 by the spring 14 to open the opening 6 of the hook body 2. Is held in a hook body closing posture that closes the opening 6 of the hook body 2 by locking the tip end portion 7a with the stopper locking portion 8 from above. The stopper 16 is held in a horizontal position by a spring 16 and the stopper release rope 9 is pulled downward, whereby the distal end portion 7a of the stopper piece 7 is detached downward from the stopper locking portion 8 so that the opening 6 of the hook body 2 is opened. Since the hook 1 is opened, the hooking operation of the hook 1 on the strand S and the removing operation of the hook 1 from the strand S are easy and easy. Without such strand S is caught by the distal end portion 7a of the stopper piece 7 when removed, it is possible to improve the workability.

  In the hook body closing posture in which the stopper piece 7 closes the opening 6 of the hook body 2, the tip end portion 7 a of the stopper piece 7 is locked from above with respect to the stopper locking portion 8 of the swing lever 10. Since the stopper piece 7 and the stopper locking portion 8 are completely in contact with each other, the hook main body 2 is not detached from the strand S even in a thin strand S, and work safety can be ensured.

  According to the second aspect of the present invention, the end surface 8o of the stopper locking portion 8 facing the opening 6 of the hook body 2 is formed in a tapered surface, and the stopper is in a state of being detached downward from the stopper locking portion 8. By pushing up the tip 7 a of the piece 7 along the tapered surface 8 o, the swing lever 10 swings against the spring 16, and the tip 7 a of the stopper piece 7 is stopped by the stopper locking portion 8 of the swing lever 10. Since the hook 1 is hooked on the strand S and the hook 1 is removed from the strand S, the hook 1 is more easily and easily engaged.

  According to the third aspect of the present invention, the hook mounting bracket 11 is provided on the base end side leg portion of the hook main body 2, and the base end side leg portion 3 of the hook main body 2 is attached to the pillar P of the ladder A by the hook mounting bracket 11. Since it is detachably attached to the top, if the ladder A side is damaged or cannot be used, the hook 1 can be removed and replaced with a new ladder A. If the hook 1 side is damaged The hook 1 can be removed and repaired, or a new hook 1 can be attached.

  According to the fourth aspect of the present invention, the hook mounting bracket 11 is connected to the hook receiver 17 having a U-shape formed by the upper and lower horizontal pieces 17 a and 17 b and the vertical piece 17 c, and the vertical piece 17 c of the hook receiver 17. The mounting bracket 18 is detachably attached to the top of the column P of the ladder A. The mounting bracket 18 is perpendicular to the first plate portion 22a connected to the vertical piece 17c of the hook receiver 17 and one end thereof. The L-shaped main body 22 that is formed in an L shape with the coupled second plate portion 22b and fits to the two adjacent side surface portions a and b of the ladder column P, and the distal end portion of the second plate portion 22b. The rotating plate 24 is pivotally attached to the base end, and the L-shaped main body 22 is fitted to the two adjacent side surface portions a and b of the ladder support P, and the rotating plate 24 is On the side opposite to the first plate portion 22a of the main body 22 against the side portion c of the ladder support P In a state where the ladder support P is gripped, the front end portion of the first plate portion 22a and the free end portion of the rotating plate 24 are fastened with the fastening bolts 25, and are held and fixed to the top portion of the ladder support post P. Thus, the hook 1 can be easily and quickly attached to and removed from the ladder post P.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a use state of a ladder hook according to the present invention, showing a hook body closing posture, and FIG. FIG. 3A is a front view of a ladder hook, FIG. 3B is a plan view, FIG. 3C is a bottom view, and FIG. 3D is a side view. FIG. 4 is a front view of the ladder hook attached to the ladder column. 5 and 6 are explanatory views showing the operation of the hook in use, and FIG. 7 is a perspective view showing a hook attachment state.

  In these drawings, reference numeral 1 denotes a ladder hook, which has a hook body 2 formed in a substantially inverted U shape with a base end side leg portion 3, a distal end side leg portion 4 and a bent portion 5. The hook body 1 is configured such that the base end side leg portion 3 can be detachably attached to the top of the column P of the ladder A via the hook mounting bracket 11, and the hook body is attached to the lower end portion of the tip end side leg portion 4. The base end of the stopper piece 7 that closes the opening 6 of the hook 2 is pivotally attached by the support shaft 12, and the lower end of the base end side leg 3 is locked with the stopper on one end facing the opening 6 of the hook body 2. A swinging lever 10 having a portion 8 and having a stopper releasing rope 9 attached to a rope attaching portion 10 o on the other end side is pivotally attached to a support shaft 15. An insulating cover 13 having elasticity such as rubber or synthetic resin is attached to the bent portion 5 side of the hook body 2.

  The ladder A is composed of a pair of struts P, P on both sides and a plurality of spades N (see FIG. 4) horizontally laid between the P, P at regular intervals. As shown in (b), a groove shape member made of an aluminum extrusion mold material having a U-shaped cross section with a bottom wall portion a and both side wall portions b, b is disposed with its groove opening c facing outward. A synthetic resin end cap K is fixed to the top end face of the column P (see FIG. 7). The ladder hook 1 is attached to the upper end portions of both supports P, P, respectively. Note that the ladder A may be an extendable ladder in which a plurality of ladders are connected to be extendable.

  The structure of the hook 1 will be described in more detail. The stopper piece 7 is always separated from the stopper engaging portion 8 of the swing lever 10 downward by the spring 14 as shown by the solid line in FIG. The opening 6 of the hook body 2 is held in an openable posture, and the tip 7a is engaged with the stopper locking portion 8 from above as shown by the solid lines in FIGS. By being stopped, the hook body 2 is held in a closed posture for closing the opening 6 of the hook body 2. The stopper piece 7 is normally held at the position indicated by the solid line in FIG. 4 by the spring 14, but in a range of approximately 180 ° between the downward vertical position and the upward vertical position as shown by the phantom line in FIG. It can be rotated.

  The swing lever 10 is normally held in a horizontal position as shown by solid lines in FIGS. 1, 3 (a) and 4, but by pulling the stopper release rope 9 downward, the spring 16 3, the stopper locking portion 8 comes into contact with the front side surface of the lower end portion of the base end side leg portion 3 of the hook body 2 to rotate the orbit of the stopper piece distal end portion 7 a. The stopper piece distal end portion 7a is thereby released downward from the stopper engaging portion 8 so that the opening 6 of the hook body 2 is opened. In the horizontal posture shown by the solid line in FIG. 3A, the swing lever 10 is in contact with the rear side surface of the lower end portion of the base end side leg portion 3 of the hook body 2 by the contact piece 10a on the rear end side. Even when a large downward load is applied to the stopper piece 7 in the closed position of the hook body in which the tip 7a of the stopper piece 7 is locked to the stopper locking portion 8, the swing lever 10 does not swing, and the stopper piece 7 The hook body closed posture can be maintained.

  As can be seen from FIG. 4, the end surface 8o of the stopper locking portion 8 facing the opening 6 of the hook body 2 is formed in a tapered surface, and downward from the stopper locking portion 8 as shown by the solid line in FIG. By pushing up the tip 7a of the stopper piece 7 in the detached state along the tapered surface 8o, the swing lever 10 swings against the spring 16, and as shown by the phantom line in FIG. The distal end portion 7 a of the stopper piece 7 is adapted to be engaged with the stopper engaging portion 8 of the swing lever 10.

  As shown in FIGS. 1 to 3 and 7, the hook mounting bracket 11 is formed in a U-shape with the upper and lower horizontal pieces 17 a and 17 b and the vertical piece 17 c, and the upper and lower horizontal pieces 17 a and 17 b have the base of the hook body 2. A hook receiver 17 that is fitted to the end leg 3 so as not to rotate, and a mounting bracket 18 that is connected to a vertical piece 17c of the hook receiver 17 and is detachably attached to the top of the column P of the ladder A. Then, an anti-rotation member 20 having a square or other polygonal cross section made of nylon or other synthetic resin is fixed to the fitting insertion portion of the base end side leg portion 3 of the hook body 2 to the hook receiver 17. The rectangular insertion hole 19 of the metal receiver 17 has a shape that matches the anti-rotation member 20, and a coil spring 21 is interposed between the lower surface of the anti-rotation member 20 and the lower horizontal piece 17 b of the hook metal 17. , Always hook receiving 7 and fitting the rotation stopper member 20 is held.

  As can be seen from FIG. 7, the mounting bracket 18 of the hook mounting bracket 11 includes a first plate portion 22 a connected to the vertical piece 17 c of the hook receiver 17 and a second plate portion vertically connected from one end thereof. 22b and is formed in an L-shape, and the two side surfaces adjacent to the column P of the ladder A, for example, as shown in FIG. 3 (b) and FIG. An L-shaped main body 22 fitted to the two side surfaces from the outside, and a rotating plate 24 whose base end is pivotally attached to the tip of the second plate 22b by a support shaft 23. The character-shaped main body 22 is fitted to the two adjacent side surfaces a and b of the ladder support P, and the side surface of the ladder support P is arranged on the side facing the first plate 22 a of the L-shaped main body 22. In the state where the ladder support P is held by being applied to the part c ((b) in FIG. 3 and the groove opening c in FIG. 7), the tip of the first plate part 22a By fastening the parts and free end of the pivot plate 24 in the wing bolt 25 for tightening, and is gripped secured to the top of the post P of the ladder A.

  The L-shaped main body 22 is provided with a nut portion 26 into which the butterfly bolt 25 is screwed at the distal end portion of the first plate portion 22a, and a bolt insertion hole through which the butterfly bolt 25 is inserted into the free end portion of the rotating plate 24. 27 is provided. Further, the first plate portion 22 a of the L-shaped main body 22 is connected to the vertical piece 17 c of the hook receiver 17 with a screw 28 and a nut 29.

  In order to attach the ladder hook 1 configured as described above to the column P of the ladder A, as shown in FIG. 7, the mounting bracket 18 of the hook mounting bracket 11 provided on the base end side leg 3 of the hook body 2. Is opened, that is, the pivot plate 24 of the mounting bracket 18 is pivoted outwardly about the support shaft 23, and the hook 1 is brought to the top of the ladder column P from such a state. 7 is lowered as it is, and the L-shaped main body 22 of the mounting bracket 18 is fitted to the two side surfaces a and b of the ladder column P, and then rotated so as to close the rotation plate 24 and the ladder column. By covering the side surface portion c (groove opening portion) of P, the L-shaped main body 22 can be removed from the bolt insertion hole 27 in the free end portion of the rotating plate 24 in a state where the top portion of the support column P is gripped. A wing bolt is attached to the nut portion 26 at the tip of the first plate portion 22a. It may be entered into by screwing in 5.

  In this case, the cap K fixed to the top end surface of the ladder support P is slightly larger in diameter than the support P, and the lower surface side peripheral edge of the cap K is slightly protruded from the outer peripheral edge of the support P. When the top of the column P is gripped by the mounting bracket 18 of the hook mounting bracket 11, the upper edge of the L-shaped main body 22 and the upper edge of the rotating plate 24 come into contact with the lower edge of the cap K, Therefore, as long as the cap K is firmly fixed to the top end face of the column P, the mounting bracket 18 of the hook mounting bracket 11 does not come out from the top of the column P when the ladder hook 1 is used.

  Next, a method of using the ladder hook 1 configured as described above will be described with reference to FIGS.

  In FIG. 5A, the tip 7a of the stopper piece 7 is slightly detached downward from the stopper locking portion 8 of the swing lever 10, and the opening 6 of the hook body 2 is in a state where the stopper piece 7 is inclined downward. The initial state maintained in the posture which can open | release is shown.

  Thus, in order to hook the hook 1 on the strand S stretched in the air, the stopper piece 7 is positioned directly above the strand S above the strand S as shown in FIG. When the ladder A is lowered as it is and the hook 1 is moved downward from such a state, the stopper piece 7 is pushed up by the strand S as shown in FIG. Rotate upward. During this rotation, the tip end portion 7a of the stopper piece 7 is pushed up along the taper surface 8o of the swing lever 10, so that the swing lever 10 swings against the spring 16 by the taper action. After the tip 7a of the stopper piece 7 has passed through the stopper locking portion 8, the strand S moves away from the hook 1 and hits the bent portion 5 of the hook body 2 as shown in FIG. The main body 2 is caught by the strand S.

  Thus, when the strand S is hooked on the bent portion 5 of the hook body 2, the stopper piece 7 tries to return to the initial state by the urging force of the spring 14, and rotates clockwise from the phantom line shown in FIG. Therefore, as shown by the solid line in the figure, the hook body closing position where the front end portion 7a is locked from above with respect to the stopper locking portion 8 of the swing lever 10 and the opening 6 of the hook body 2 is closed. Therefore, even when the hook 1 is moved upward in this hook body closed position and the strand S strikes the stopper piece 7, the stopper piece 7 can maintain its closed state.

When a plurality of strands S (for example, two) are present at intervals in the vertical direction as shown in FIG. 5 (d), a stopper piece is formed by the upper strand S as shown in FIG. 5 (b). 7 is pushed up and then the hook 1 is lowered as it is, the lower strand S is formed as shown in FIG.
After the stopper piece 7 in the state shown in Fig. 5 is pushed up as shown in Fig. 5 (d), the stopper piece 7 closes the opening 6 of the hook body 2 as shown in Fig. 5 (c) ( Hook body closed position).

  When the stopper piece 7 is in the hook body closed position and the opening 6 of the hook body 2 is closed as described above, the stopper release rope 9 may be pulled downward when releasing the closed state. The state is shown in (a) and (b) of FIG. That is, when the stopper releasing rope 9 is pulled downward from the state in which the distal end portion 7a of the stopper piece 7 is locked to the stopper locking portion 8 of the swing lever 10, as indicated by the phantom line in FIG. As can be seen from FIG. 4, the swing lever 10 swings clockwise about the support shaft 15, and the stopper locking portion 8 retreats to the outside of the rotation locus of the stopper piece tip portion 7a. The stopper piece 7 returns to the initial state as shown by the phantom line in FIG. When the stopper piece 7 returns to the initial state, the stopper releasing rope 9 may be left free.

  If the ladder A is lifted and the hook 1 is moved upward while the stopper piece 7 remains in the initial state, the strand S pushes down the stopper piece 7 as shown in FIG. It will come out from the bottom and will be in the state shown to (a) of FIG. After the strand S is pulled out from the stopper piece 7, the stopper piece 7 is slightly detached downward from the stopper locking portion 8 of the swing lever 10, and the opening of the hook body 2 is in a state where the stopper piece 7 is inclined downward. It returns to the initial state in which the part 6 is held in an openable posture.

  In the ladder hook 1 according to the embodiment described above, the base-end-side leg 3 of the hook body 2 formed in a substantially inverted U shape by the base-end-side leg 3, the front-end-side leg 4, and the bent portion 5 is used as the ladder. The base end of the stopper piece 7 that closes the opening 6 of the hook body 2 is pivotally attached to the lower end of the distal end side leg 4, and is attached to the lower end of the proximal end side leg 3. Is a hook formed by pivoting a swing lever 10 having a stopper locking portion 8 on one end facing the opening 6 of the hook body 2 and having a stopper releasing rope 9 attached to the other end. Since the mounting structure of the swing lever 10 and the mounting structure of the stopper piece 7 are divided into the base end side leg portion 3 and the tip end side leg portion 4 of the hook body 2, the mounting structure is simple and parts can be replaced. It becomes easy to do.

  In this hook 1, the stopper piece 7 is always in a posture in which the distal end 7 a can be released downward from the stopper locking portion 8 of the swing lever 10 by the spring 14 to open the opening 6 of the hook body 2. Is held in a hook body closing posture that closes the opening 6 of the hook body 2 by locking the tip end portion 7a with the stopper locking portion 8 from above. The stopper 16 is held in a horizontal position by a spring 16 and the stopper release rope 9 is pulled downward, whereby the distal end portion 7a of the stopper piece 7 is detached downward from the stopper locking portion 8 so that the opening 6 of the hook body 2 is opened. When the hook 1 is hooked on the strand S stretched in the air, the ladder A is lowered from the state in which the stopper piece 7 is directly above the strand S. By simply moving the hook 1 downward, the stopper piece 7 is pushed up by the strand S and rotated upward. During this rotation, the tip 7 a of the stopper piece 7 extends along the tapered surface 8 o of the swing lever 10. By pushing up, the swing lever 10 swings against the spring 16, and after the distal end portion 7 a of the stopper piece 7 passes through the stopper locking portion 8, the strand S is separated from the hook 1 and the hook body 2. When the hook body 2 hits the bent portion 5 and is caught by the strand S, and the stopper piece 7 closes the opening 6 of the hook body 2, the stopper release rope 9 is moved downward when releasing the closed state. The hook 1 is easily hooked on the strand S and the hook 1 is removed from the strand S. Without such removal strand S is caught by the distal end portion 7a of the stopper piece 7 when the, it is possible to improve the workability.

  Further, the hook 1 is configured so that the tip end portion 7a of the stopper piece 7 is engaged with the stopper engaging portion 8 of the swing lever 10 from above when the stopper piece 7 closes the opening 6 of the hook body 2. Since the stopper piece 7 and the stopper locking portion 8 are in complete contact with each other, the hook body 2 is not detached from the strand S even with a thin strand S, and the safety of work can be ensured. .

  In this embodiment, the end surface 8o of the stopper locking portion 8 facing the opening 6 of the hook body 2 is formed into a tapered surface, and the tip end portion of the stopper piece 7 in the initial state is detached downward from the stopper locking portion 8. By pushing up 7 a along the tapered surface 8 o, the swing lever 10 swings against the spring 16, and the tip 7 a of the stopper piece 7 is locked to the stopper locking portion 8 of the swing lever 10. However, when the end face of the stopper engaging portion 8 facing the opening 6 of the hook body 2 is not tapered, the stopper releasing rope is used when the hook 1 is hooked on the strand S when the stopper piece 7 is in the initial state. It is only necessary to pull 9 to retract the stopper locking portion 8 of the swing lever 10 to the non-locking position. However, as in this embodiment, the operation of hooking the hook 1 on the strand S and the operation of removing the hook 1 from the strand S are made easier and easier by tapering the end face of the stopper locking portion 8.

  Further, in the hook 1 of this embodiment, a hook mounting bracket 11 is provided on the base end side leg portion of the hook main body 2, and the base end side leg portion 3 of the hook main body 2 is attached to the pillar P of the ladder A by the hook mounting bracket 11. Since it is detachably attached to the top, if the ladder A side is damaged or cannot be used, the hook 1 can be removed and replaced with a new ladder A. If the hook 1 side is damaged The hook 1 can be removed and repaired, or a new hook 1 can be attached.

  The hook mounting bracket 11 is formed in a U-shape with the vertical horizontal pieces 17a and 17b and the vertical piece 17c, and the base end side leg portion 3 of the hook body 2 is fitted into the vertical horizontal pieces 17a and 17b and cannot be rotated. A hook receiver 17 attached to the hook receiver 17 and a vertical bracket 17c of the hook receiver 17 and a mounting bracket 18 which is detachably attached to the top of the pillar P of the ladder A. The mounting bracket 18 is perpendicular to the hook receiver 17. The first plate portion 22a connected to the piece 17c and the second plate portion 22b vertically connected from one end of the first plate portion 22c are formed in an L shape, and the two side surface portions a and b of the ladder support P are adjacent to each other. The L-shaped main body 22 is composed of a L-shaped main body 22 and a rotating plate 24 whose base end is pivotally attached to the distal end portion of the second plate portion 22b. While fitting to the side surface parts a and b, the rotation plate 24 is formed in an L-shape. In a state where the ladder support P is held by the side 22c of the ladder support P on the side facing the first support 22a of the main body 22, the free end of the first plate 22a and the swing plate 24 are free to move. Since the end is fastened to the top of the ladder post P by fastening with the fastening bolts 25, the hook 1 can be attached to and removed from the ladder post P easily and quickly. Can do.

It is a perspective view which shows the use condition of the hook for ladders which concerns on this invention, and shows a hook main body closing attitude | position. It is a perspective view which shows the hook of the state which exists in the attitude | position which a hook main body can open | release. (a) is a front view of a ladder hook, (b) is a plan view, (c) is a bottom view, and (d) is a side view. It is a front view of the hook for ladders of the state attached to the support | pillar of a ladder. It is explanatory drawing which shows operation | movement of the hook at the time of use. It is explanatory drawing which shows operation | movement of the hook at the time of use. It is a perspective view which shows the attachment state of a hook.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladder hook 2 Hook main body 3 Base end side leg part 4 Front end side leg part 5 Bending part 6 Hook main body opening part 7 Stopper piece 8 Stopper latching part 9 Stopper release rope 10 Swing lever 11 Hook mounting bracket

Claims (4)

  The base end side leg of the hook body formed in a substantially inverted U shape with the base end side leg, the front end side leg, and the bent part can be attached to the top of the ladder column, and the lower end of the front end leg is The base end of the stopper piece that closes the opening of the hook body is pivotally attached, and the lower end of the base end side leg has a stopper locking portion at one end facing the opening of the hook main body and the other end. This is a ladder hook that is pivotally attached to a swing lever with a stopper release rope attached to it, and the stopper piece is always released downward from the stopper locking portion of the swing lever by a spring. The opening of the hook body is held in an openable posture, and the tip of the hook is locked from above with respect to the stopper locking portion, so that the hook body is held in the closing posture of closing the hook body. The swing lever is held in a horizontal position by a spring. There, by pulling the stopper releasing ropes downwards, the tip of the stopper piece is disengaged from the stopper locking portion downwardly, ladder hook, characterized in that so as to open the opening of the hook body.   The end face of the stopper engaging portion facing the opening of the hook body is formed into a tapered surface, and by pushing up the tip end portion of the stopper piece that is separated downward from the stopper engaging portion along the tapered surface 2. The ladder according to claim 1, wherein the swing lever swings against the spring, and the tip end portion of the stopper piece is locked to the stopper locking portion of the swing lever. hook.   2. A hook mounting bracket is provided on a base end side leg portion of the hook main body, and the base end side leg portion of the hook main body is detachably mounted on a top of a ladder column by the hook mounting bracket. Or the hook for ladders of 2. The hook mounting bracket is formed in a U-shape with an upper and lower horizontal piece and a vertical piece, and a hook receiver attached non-rotatably by inserting the base end side leg of the hook body into the upper and lower horizontal piece, and the vertical of the hook receiver. The bracket includes a mounting bracket that is connected to the top of the ladder and is detachably attached to the top of the ladder. The mounting bracket is vertically coupled to the first plate portion connected to the vertical piece of the hook receiver and one end thereof. An L-shaped main body that is formed in an L shape with the second plate portion and fits to two adjacent side surface portions of the ladder column, and a rotating plate having a base end portion pivotally attached to the distal end portion of the second plate portion The L-shaped main body is fitted to the two adjacent side surface portions of the ladder column, and the rotating plate is placed on the side surface portion of the ladder column on the side facing the first plate portion of the L-shaped main body. Fasten the tip of the first plate and the free end of the rotating plate with the tightening bolt while holding the ladder support And, the ladder hook according to claim 3, characterized in that is adapted to be gripped secured to the top of the ladder posts.

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