JPS60226991A - Fixing apparatus of upper ladder - 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 The present invention relates to a ladder that is supported by a lower lever and can be expanded and contracted from the ground by means of a rope. The purpose is to have a top view from the top of the roof and to be able to freely change the position of the bottom of the ladder.

First, the structure of a conventional ladder will be explained using FIGS. 1 and 2. The lower punch 1 is integrally equipped with a pair of vertical members 1a arranged parallel to each other with a distance between them, and treads 412 arranged horizontally and equally spaced between the two classes 441a and Ia, and the lower ends of the two classes 1a. has a lower end fitting 3 for anti-slip through a horizontal bin (not shown).

4 is a support post cover. The vertical member 1a is made of, for example, a channel-shaped member made of aluminum, and the vertical member 5a of the top view 5 is fitted and supported in a retaining groove (not shown) extending in the longitudinal direction of the vertical member 1a. 5 is slidable vertically relative to the ladder 1.

Similar to the lower punch 1, the upper part 5 has a plurality of step bars 6 integrally spaced at equal intervals between the vertical members 5a, 5a, a slide resin 7 at the lower end, and a non-slip end 8 at the upper end. has. One end of the rope 11 is connected to the bracket 10 provided on the tread 416a at the lower end of the upper ladder, and the rope 111 extends upward from the bracket 10, and the middle part connects to the third tread 112a from the top of the lower ladder 1. Pulley 28 supported via
The part that passes through the pulley 28 is usually along the upper ladder 5, and the tip of the lobe 11a hangs down to a position that can be easily reached from the ground.

As is clear from FIGS. 2 and 2a, a rectangular cylindrical bracket 12 is fixed at a position above the lower end of the inner surface of the vertical upper ladder 05a, and is supported at two points by the bracket 12. The upper end of a substantially triangular hook 14 is rotatably supported by a portion of the pin 13 inside the bracket 12.
Hook 1/1 is normally biased in the direction of the arrow by a torsion coil spring (not shown) installed in bracket 12.
The cam surface 14a on the lower ladder 1 side juts out to a position where it collides with the tread 1i12 of the lower ladder 1 when the upper ladder 5 is moved up. The shape of the cam surface 14a is a curved shape that smoothly projects toward the step 2 as it goes downward. The lower end of the hook 14 on the lower ladder 1 side is a stopper 15 that projects further downward, and the upper end of a substantially triangular claw 17 is rotatably attached to the lower end of the hook 14 on the upper ladder 5 side via a pin 16. Supported. Stopper 15 and pin 16 of hook 14
In between, there is provided an abutment surface 14b having a shape that fits the upper surface of the step 2 when the hook 14 abuts against the Braut front plate 12a as shown in FIG. The claw 17 has a flange 18 bent at right angles to the underline, and the distance from the pin 16 to the flange 18 is different for each part because the claw 17 is approximately triangular. The distance between the portion 18a and the pin 16 is larger than the distance between the lower portion adjacent to the end portion 18a and the pin 16, and the end portion 18a is
As shown in the figure, it can be fitted into the stopper 15 from below and integrated.

When the tip of the lobe 11a (Fig. 1) is pulled downward, the lower ladder 1
Meanwhile, the upper ladder 5 begins to rise, and the cam surface 14 of the hook 14
When a collides with the treadle 2 from below, the hook 14 rotates in the opposite direction against the elasticity of the spring, and the hook 14 passes through the treadle 2 upward.

However, since the claw 17 is suspended from the pin 16 in a free state as shown in FIG. Rotate counterclockwise (reverse B direction) around the center and
attempts to pass upward. Then, when the upper ladder 5 is pulled up further, the claw 17 becomes one step! 1iI2 completely upwards, and repeating this operation, the upper ladder 5 rises. In order to stop the upper ladder 5 at a predetermined position, immediately after the hook 14 crosses one treadle 2 (excluding the force applied to the tip of the lobe 11a before the claw 17 crosses the treadle at the corresponding position) , lower the upper ladder 5 a little and hook 14
The abutment surface 14b comes into pressure contact with the upper surface of the step 2 that passed just before, and the lowering of the upper ladder 5 is prevented. In order to lower and store the entire upper ladder 5, immediately after both the hook 14 and the pawl 17 pass upwardly over one step 2, the lobe is loosened and the upper ladder 5 is lowered. Then, the flange 18 of the claw 17
The flange upper end 1 collides with the treadle 2 immediately below it and rotates in the direction of arrow B about the pin 16 (Fig. 2a).
8a engages with the stopper 15, and the claw 17 and hook 14
Since a moment in the opposite direction from the treadle 2 to the pin 13 acts on the combined body of the treadle 2, the hook 14 rotates in the opposite direction about the pin 13 together with the claw 17, thus avoiding the treadle 2. 1 and 2, and in a similar manner, it successively climbs over the lower treadles 2 to reach the retracted position shown in FIGS. 1 and 2.

According to the conventional structure explained above, the lobe tip 11a
When using the ladder by pulling it downward to raise the upper ladder 5 to a predetermined position with respect to the lower ladder 1, and hanging the ladder on the roof in the extended position with the hook 14 hooked on the step 2 at the corresponding position, it is necessary to When a worker lifts the upper end of the upper ladder 5 from the roof and tries to change the installation position of the ladder (the grounding position of the non-slip lower end metal fitting 3), the combination of the hook 14 and the pawl 17 becomes one treadle. 2 may pass upward, and the upper ladder 5 may not be able to be locked.

Therefore, when moving the ladder sideways, the worker must operate it from the ground, which makes it cumbersome to move the ladder up and down.

In order to solve the above-mentioned conventional problems, the present invention aims at, for example, when the upper ladder 5 is pulled up from the roof, the upper ladder 5 is constant f? with respect to the lower ladder 1? It does not rise above tH' (the range in which the pawl 17 passes upward through the step 2 directly above it). The lobes 11 pass through the upper ladder fasteners 20 provided on the lower ladder 1 and from there the tip end 1
It is configured to hang down towards the 1b side.

At j5 in FIG. 3, which shows a cross section taken along the line ■-■ in FIG. The flat stopper surface 23 at the upper end is pressed against the lower surface of the earthen wall of the bracket 24 to prevent the stopper 20 from rotating in the direction of the arrow C.
0 is provided with a protrusion 25 against which the upper surface of the step 6 of the upper ladder 5 abuts, and a cam surface 26 forming the upper edge of the protrusion 25. It is inclined toward the lower ladder 1 side as it rises toward the surface 23. The fastener 20 is provided with an inclined lobe hole 27 in the thick part on the opposite side of the cam surface 26 with respect to the insertion hole of the bolt 21, and this rope hole 27 is inclined so as to move toward the upper ladder 5 as it descends. There is. Step bolt 2
The bracket 24 supporting the lower ladder 1 is a U-shaped member that opens toward the lower ladder 1 as shown in FIG. 4, and the bolt 21 is the bracket 21! Vertical wall of I24. It is supported at two points by a and the central vertical wall 1a of the lower ladder 1. That is, when tightening the stepped 29 of the bolt 21 to the nut 30 and the vertical wall 1a,
The upper wall 24b1 of the bracket 24, the lower wall 24c, and the vertical wall 1a
The bracket 24 is pressed into contact with the lower ladder 1, and the bracket 24 is integrated with the lower ladder 1. Loaf 11 hanging down from the pulley part is on the bracket Q
? The inclined rope hole 27 passes through the side of Ib (Fig. 3).
and from its lower end to the braut bottom wall 24. It passes along the side of c and hangs downward from there.

When a worker pulls up the upper ladder 5 from the top of a roof, when no downward force is applied to the tip of the lobe 11b, the stopper 2o maintains the position shown in Fig. u6 is H until the 6' position (when you turn your upper arm, there is a protrusion 25
Since the upper ladder 5 collides with the lower ladder 1, it is no longer possible to raise the upper ladder 5 relative to the lower ladder 1, and from then on, the upper ladder 5 is lower than the lower ladder 1.
It will be integrated with the upper pipe. The above-mentioned dimension H is set within a range in which the pawl 17 (FIG. 2) does not pass upward through the treadle 2 immediately above due to the rise of fn (Ij) of the upper ladder 5. Therefore, even if the worker pulls up the upper ladder 5 from the top of the roof, the claw 17 (Fig. 2) does not pass upward through the tread 2 directly above it, and therefore, even after the worker shifts the position of the ladder to the side, the claw 17 (Fig. 2) does not pass upwardly. 14 similarly engages with the upper surface of the previous step 2, and the whole retains the function of a ladder. The worker removes the tip of the lobe 1 from the ground.
When 1b is pulled downward, the part of the lobe that passes through the hole 27 (Fig. 3) stretches into the vertical position shown by the two-dot chain line, so the stopper 2o resists the elasticity of the spring 22 and becomes inverted C. direction, the protrusion 25 no longer interferes with the step 6, and therefore the upper ladder 5 can be further raised, and the claw 17 (FIG. 2)
It is also possible to temporarily move the upper ladder 5 above the step 2 directly above it, loosen the lobes, and store the upper ladder 5 downward.

According to the present invention, the upper ladder stopper 20 is provided on the lower ladder 1 to normally prevent the upper ladder 5 from rising, and the stopper 20 is raised only when the lobe tip 11b is pulled to pull up the upper ladder 5. The stopper 20 and the lobe 11 are interlocked and connected so that the ladder 5 can be moved backward from the tread 6, so even if a worker pulls up the upper ladder 5 from the roof, for example, the claw 17 will pass through the tread 2 upward. This eliminates the need for the worker to come down to the ground and shift the position of the ladder to the side, making handling easier.

When embodying the present invention, the lobe 11 is made to snake through two pins provided in the stopper 20, and the action of the stopper 20 is disabled only when the lobe is pulled, similar to when it is passed through the hole 27. You can do it like this. Further, similar functions can be achieved using various conventionally known mechanisms such as lock levers and lock cams.

[Brief explanation of drawings]

Fig. 1 is a front view of a ladder to which the present invention is applied, Fig. 2 is a right side view, Fig. 2a is an explanatory diagram of operation, and Fig. 3 is a diagram of ■-■ of Fig. 1.
The enlarged cross-sectional view, FIG. 4, is a cross-sectional view of FIG. 1
... top view, 2... stepping stone, 5... top view, 11.
...lobe, 11b...tip, 14...hook,
16...Pin, 17...Claw, 18...Flange (
cam surface), 20...stopper, 28...pulley Patent applicant: Japan Aluminum Industry Co., Ltd. Japan Aluminum Tsurumaru Co., Ltd. Figure 4

Claims (1)

[Claims] A lower punch, an upper part slidably supported by the lower punch, a rope fixed to the lower end of the upper part, and a rope attached to the lower part so as to hang the middle of the rope. A pulley provided near the upper end, a hook for fixing the upper position supported in the F13 downward direction by a bin parallel to the step bar in the upper position, and pushed in the direction of engaging with the crosspiece of the lower punch (4 forces);
When a Gishi ladder is suspended from another bin on a hook parallel to the above-mentioned bin and moves upwardly over one treadle later than the hook, the cam surface that retracts the hook from the treadle of the lower mallet is used. In a ladder consisting of a claw to be formed, when lifting the lower mallet with a J stiffness on the upper side, an upper side stopper is rotatably provided on the lower lever to prevent the upper side from rising with respect to the lower ladder, and the tip of the rope is moved downward. A device for fixing the upper part P, which is characterized in that the stopper and the rope are interlocked and connected so that the stopper can be rotated back from the treadle of the upper part only when the upper part is pulled up. 7