DE888312C - Detachable device for rigid connection of loose, telescopic extendable pipes for extendable construction Ruestboecke u. like - Google Patents

Description

Detachable device for rigid connection of loose, telescopically extendable Pipes for extendable construction trestles and the like. For the construction of construction equipment, Plastering trestles, scaffolding, ladders, etc. pipes are often used as construction elements used @ used. Should: such auxiliary equipment., Trestles and the like. Extendable be, so one uses already telescopically nested tubes in many cases or tubes with inserted round bars; the inc intertwined pipes or Pipes and rods have transverse perforations at intervals through which strong splint or thorn or digl. .inserted, the one that is nested Keeps parts together in a certain total length.

In the rough treatment of which construction trestles, scaffolding, etc. unavoidable when working on the construction site, exposed to wind and weather the construction elements to be pushed into one another must not be exactly related to one another be calibrated, as rust, penetrated mortar, paint or the like. A telescopic Making it difficult to slide the parts into or apart from one another and soon make it completely impossible would. For this reason, the outer diameters (of the inner tubes or rods ample, chosen smaller than the inner diameter of the tubes into which they are pushed Need to become. But this has the consequence that the construction worker z. B. on the arming stand has no firm footing under the feet, there, the interlocking ones with the Mandrel held together pipes only at one point of their inner or outer diameter can touch closely, therefore wiggle into each other, and more so, ever greater : the difference in diameter between the nested parts had to be selected.

The invention eliminates these problems.

The invention consists in @ that, the t, # l @ eskoparti; g to be plugged into one another Construction elements in which, for the well-known reasons, the outer diameter of the pipes or rods to be inserted are smaller than the inside diameter of the pipes outside, automatically into a fixed length over the length that is plugged into one another, the Pipe axes parallel line contact between the outer surface (of the inserted part and the inner surface of the outer tube are brought by one of the tubes, e.g. B. the outer tube, e.g. B. near its lower end, on two congruent opposite Places with two parallel, at an acute angle to the pipe axis extend, aufeniden, each other opaque opposite. Elongated holes: is provided that are so arranged and sized are that at .den elongated hole ends of the hole center distance from the inner wall of this tube is smaller than the outer radius of the tube or the tube to be inserted into the tube Rod, while Ida's inner tube drills through in the middle at corresponding intervals is with a round hole with a diameter about the width of the elongated hole.

The two nested pipes now z with a through plugged through the holes Dorn: usammengefaßt, this mandrel in the slanting long hole under the effect and in the direction of the pressure exerted on the inner tube pressure (or train) must as far as possible for him on a Slide the edge of the slot towards the end of the slot. until automatically. the line contact of the nested pipe pieces is achieved, so that the sliding movement of the mandrel is ended and the connection of the nested pipes is immovably rigid and therefore stable. When the telescopic parts are pulled apart, the mandrel now glides on the flank of the slot in the opposite direction; the mandrel is released and the connection is then easy to loosen.

The invention is suitable for extendable plastering or rigging stands, for scaffolding, ladders, etc.

In the drawing, there is an exemplary embodiment along with details of the invention shown schematically. In the pictures there are identical parts the same reference numerals.

Fig. I shows the tubes, which can be telescoped into one another, on pale Pipe axis aligned; Fig. 2 shows these two tubes seen from above, in section, through the holes; Fig. 3 shows: the two tubes inserted into each other and: according to the Invention - rigidly connected to each other; Fig. 4. shows a section through the pipe connection "of Abib. 3 at levels X-Y.

In detail, i denotes the outer tube, and 2 denotes the tube that is to be stuck into @this Called inner tube. With 3 they are in the outer tube in both. opposite Walls and congruent elongated holes referred to; the width (of the elongated hole corresponds at least to the diameter of the hole. across the inner tube 2 or the mandrel diameter 6 (section 4). The slot width and the bore 4 selected slightly larger than the mandrel diameter 6, in order to push it through to facilitate.

The elongated hole 3 runs at an acute angle a to the axis of the outer tube and eats to be measured in its length so that the distance A (section i) from the pipe channel wall is smaller than the radius, B of the inner tube.

Should the arrangement according to the invention only for compressive or only for tensile stress are used, so! it is sufficient to start in the middle of the pipe - des, only in the pressure or direction of pull arranged elongated hole; for compressive and tensile loads According to the invention, the elongated hole is formed in both directions, as shown in Fig. i shown.

With 5 is a second bore of the diameter of the bore 4 across denotes the inner tube to gain a second extension length.

If the tubes 1, 2 are plugged into one another with the same axes and the mandrel 6 is inserted, under load pressure G on the outer pipe - wohe.i the inner pipe 2 serves as a foot piece, the mandrel 6 inserted in 4 in the elongated hole 3 along its flank C led up and. at the same time, the inner tube 2; led to the left, up to the End position shown in Fig. 3 is reached, in which on the whole nested Length of the two pipe pieces between .these the line contact 7-8 prevails and so that the absolutely rigid, wobble-free pipe connection according to the invention was created is.

The pipes that are nested in one another as shown in Fig. 3 are in opposite directions Direction pulled apart again, so the mandrel 6 slides on, the other one Long hole flank downwards, lifting the line contact 7-8 and can easily be pulled out; so that the two pipe sections i and 2 are free again.

Is on the pipe sections designed according to the invention, the drawing If tension is exerted instead of pressure, what is shown in the drawing is reversed Force effect also a wobbly rigid, easily detachable connection of the pipes achieved.

Claims (1)

Claim: Detachable device for the rigid connection of loosely nested, telescopically extendable tubes for compressive and / or tensile loads, characterized in that one of the tubes, e.g. B. the inner tube (2), with a round, centrally arranged transverse bore (4) for the insertion of a mandrel (6) and the outer tube with two parallel, congruent, opposite elongated holes (3 ) of the width of the transverse bore (, I), whereby when the device is only subjected to compression or tension it is sufficient to extend the elongated holes, calculated from the center of the pipe, only in the compression or tension direction for Tensile and compressive stress on the other hand running in both directions. and dimensioning the elongated holes in the direction of the compressive or tensile stress in such a way that their center-to-center distance (A ) from the inner wall of this pipe is smaller than the outer radius (B) of the pipe to be inserted.