DE223078C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 223078 CLASS 37 /. GROUP

FRIED. KRUPP ACT-GES. in ESSEN, Ruhr.

of the upper part of the ladder are movable.

Patented in the German Empire on March 19, 1909.

The invention relates to extendable ladders, which consist of a ladder top, the Stiles are rigidly connected to each other by the rungs, and a ladder base consists of whose bars are slidably guided on the bars of the ladder upper part. the The subject of the invention ladder is particularly suitable as an observation stand in artillery battles.

ίο The drawing shows two embodiments of the subject matter of the invention, namely shows

Fig. Ι the front view of the first embodiment of the ladder in the state of use,
Fig. 2 the side view belonging to Fig. Ι and

3, on a larger scale, the section according to 3-3 of FIG. 1, seen in the direction of the arrow χ .

Fig. 4 shows the second embodiment of the ladder in a representation corresponding to Fig. 1,

5 shows the upper one in the same representation

Part of the ladder in a different position of a ladder part; also shows on a larger scale

6 shows the section along 6-6 of FIG. 4, seen from above,

7 shows the section according to 7-7 of FIG. 4, seen from the left, in a different position of one Part,

Fig. 8 shows the section according to 8-8 and

9 shows the section according to 9-9 of FIG. 5, seen from above.

The first embodiment of the subject matter of the invention will first be described.

The upward converging stiles A of the upper part of the ladder are connected to one another by rigid rungs A * and a head piece A ^2. On the stiles A , the stiles B of the lower part of the ladder can be moved. For this purpose, on the one hand at the upper end of the spars B sliding shoes b ^{1 are} attached, which encompass the spars A , and on the other hand at the lower end of the spars A sliding shoes α ³ are arranged which clasp the spars B. Near the upper end of the ladder top part clamps are α ^{4 are} arranged on the bars A, the bearing eyes a ⁵ (Fig. 2) carrying a bolt for A ^6. By means of this bolt, a two-part support CD and a saddle-shaped seat E are articulated on the upper parts of the ladder. The two parts of the support CD are slidably connected to one another by two sliding shoes c ¹ d ¹ similar to the ladder stiles. In each of the sliding blocks a ^z attached to the spars A , a latch F, which is under spring pressure and provided with a handle, is mounted. For this latch, a latch b ^{2 is} provided at the lower end of the spars B , while the upper part of the spars B has a number of latches b ^s (FIG. 1) for the latch F. Between the support parts C and D there is also a locking mechanism G d *

Claims (5)

or d ^s switched on, which corresponds completely to the locking mechanism provided between the bars B and A in terms of shape and arrangement. Two struts H are articulated on the sliding shoes a ^{s and} combine to form a fork-shaped pair of eyes h ^1. The latter can be connected to the slide shoe c ¹ by means of a key bolt c ² (FIG. 2).
The rungs Ä ^{2 of} the lower part of the ladder are attached to a special spar, which consists of two parts K and K ¹ that can be displaced on top of one another. The parts K and K ¹ are guided on each other in a similar way as the spars AB by means of sliding shoes k ^z and can be determined in any mutual position with the aid of a wing screw A ⁴ (see FIG. 3 in particular). Part K is hinged to the lower end of the one and part K ^{1 to} the upper end of the other HoI-mes B. The production of the spars k ² supporting the rungs from two mutually displaceable parts (KK ¹ ) makes it possible that you can easily take into account any unevenness of the installation site when setting up the ladder by taking into account the free length of one of the bars B of the lower part of the ladder shortened or lengthened accordingly, depending on the unevenness of the terrain, for example the left or right side rail B is pushed upwards. The spar parts KK ¹ are pulled apart. After the ladder has been set up, the spar parts K and K ¹ are fixed against each other by tightening the wing screw k *. The spar KK ¹ then forms an effective stiffening of the lower part of the ladder and thus prevents the ladder from wobbling when an observer climbs it using the rungs k * and A ¹ . After loosening the thumbscrew Ä ^4, the ladder can be collapsed readily, since the spar KK when longerons B are pushed over the spars A shortened automatically as a result of the displacement of its parts K and K ^{1. 1} Of course, the KK ¹ spar could also be made from one piece. In this case, however, it would have to be connected to one of the bars B in an easily detachable manner so that the ladder can be pushed together. , In the embodiment shown in FIGS. 4 to 9, the rungs & ^{2 of} the lower part of the ladder are attached to a stile K ^s made from one piece. This spar is located in the in Fig. 4 illustrated position of use of the conductor between the two beams B and rests with its lower end on the ground, while its upper end ^η by a bottom at the two rungs of the ladder top part AA ¹ sleeve bearing Α (Figure 4, 6 and 7) is held. The spar K ^h can, if it is desired to increase the observation height, be moved into the position shown in FIG. For this purpose, on the one hand, the spar K ^{5 is} wan on its sides each with a continuous longitudinal groove k ⁶ (cf. in particular Fig. 6 to 9) and on the other hand the sliding bearing Α ^η and the head piece A * with guide claws a ⁸ (cf. in particular Fig. 6) or a ⁹ , which can engage in the grooves k ^6. The sliding plate α ^{10 of} the sliding bearing A ¹ is displaceable in a direction perpendicular to the direction of displacement of the spar K ^s and is under the pressure of a spring a ¹¹ which, when the claws a ^s engage in the grooves k ^e , so strongly against the underside of the spar K ⁶ presses so that the resulting friction compensates for the weight of the spar. At the lower end of the spar K ⁵ is a spring-loaded, provided with a handle m ¹ bolt M (cf., especially Fig. 9) is mounted, for a plate A ¹² attached to the spars A below the head piece A ² Rast a ^{13 is} provided. If the height of the ladder in the position of the individual parts shown in FIG. 4 is sufficient, the spar K ⁵ remains in its position shown in this figure during the observation. If a greater observation height is required, the spar K ⁵ , after the observer has reached the lower rungs of the upper part of the ladder using the rungs k ² , is pushed upward until the claws a ^{9 of} the head piece A ² into the guide grooves k ^{6 of} the Intervene Holmes. The LIoIm K ⁵ is held in this position by the friction occurring ^{between it and the plate β 10 loo.} After the observer has reached the upper rungs of the upper part of the ladder, he pushes the stile K ⁵ further upwards, until the bolt M reaches the engagement with the catch β ¹³ . The spar K ⁵ now protrudes, as FIG. 5 shows, beyond the upper part of the ladder and, in this position, offers the observer the opportunity to achieve a greater observation height using the rungs k ^2. When fully collapsed, the ladder has, as can be seen without further ado, approximately the length of the top of the ladder. Godfather ν τ-An Proverbs: i. Extendable ladder with a ladder top, the stiles through the rungs are rigidly connected to each other, and a ladder lower parts, the stiles on the stiles of the upper part of the ladder are movable, characterized in that the rungs (k ² ) of the lower part of the ladder are attached to a special stile (KK ¹ or K ⁵ ) . 2. Extendable ladder according to claim i, characterized in that in the position of use of the ladder of the rungs (k ² ) of the lower part of the ladder carrying spar (KK ¹ ) with its upper end at the upper end of the one and with its lower end at the lower end of the other of the stiles (B) of the lower part of the ladder, which can be displaced on the stiles (A) of the upper part of the ladder, is attached. 3. Extendable ladder according to claim 2, characterized in that the spar (KK ¹ ) carrying the rungs (k ² ) of the lower part of the ladder consists of at least two mutually displaceable and lockable parts (K and K ¹ ) which are articulated with the the bars (A) of the ladder upper part are connected to the sliding bars (B) of the ladder lower part. 4. Extensible ladder according to claim 1, characterized in that the spar (K ⁵ ) carrying the rungs (k ² ) of the lower part of the ladder in a bearing (A ¹ ) arranged on the lower rungs (A ¹ ) of the upper part of the ladder perpendicular to the direction of the rungs (A ¹ ) of the upper part is displaceable. 5. Extendable ladder according to claim 4, characterized in that a second bearing (A ² a ⁹ ) is arranged for the rungs (¥ ■) of the lower ladder part carrying spar (K ⁵ ) at the upper end of the upper ladder part, and that means (MA ¹² a ^ls ) are provided in order to firmly connect the spar (K ⁵ ) to the upper part of the ladder in that position in which its lower end is at the upper end of the ladder. 1 sheet of drawings.