DE962303C - Threadless pipe quick coupling - Google Patents

Description

22 15149

The invention relates to a quick-release pipe coupling which enables threadless pipes to be firmly and tightly connected to connect with each other by z. B. in a known manner two with the ends of a left-handed Coil spring connected tubular sleeves by turning them against each other the clear cross-section narrow the coil spring, whereby a sealing sleeve pushed onto the pipe ends to be connected made of elastic material is tightly constricted and the tubular sleeves by means of a Locking spring to be held in the respective tightening position. In this known embodiment two special keys are also required to loosen the connection, by means of which the blocking spring can be opened. By the way the spring ends are fastened Spring breaks can occur on the pipe sleeve parts.

The threadless pipe quick coupling according to the invention is intended to eliminate these deficiencies. An example embodiment of the subject matter of the invention is shown in the drawing. It shows

Fig. Ι a side view with inserted pipe ends,

2 shows an end view with a partial sectional view,

Fig. 3 partly longitudinal, partly sectional view with inserted Pipe ends.

In the pipe coupling according to the invention, the outer ends of the pipe sleeves are α with the ends of a left-handed coil spring b

connected with a preferably square cross-section. For this purpose, the outer ends of the tubular sleeves α are flanged inward. The ones created by the flanging. Annular grooves c are used to accommodate the end turns of the coil spring b. By compressing the flange, the spring b is firmly connected to the tubular sleeves α . In order to prevent the pressed-in spring ends from sliding out when the pipe connection is tightened, the two spring ends are provided with short barbs f which push themselves into the material when the flange is pressed together (FIG. 2).

In this way it is also achieved that for fastening the spring ends on the bending of eyelets or legs can be dispensed with, reducing the risk of tearing or breaking off the spring ends when tightening the pipe connection is prevented.

To fix the two tubular sleeves α in the tightening position, a right-hand spring was used in the known design, which enclosed the two tubular sleeves and held them together. For this purpose, the tubular sleeves were provided with flat threads5 into which the coils of the spring were inserted. This design required two special keys to loosen the pipe connection and it turned out to be too expensive to manufacture. This deficiency is eliminated in the pipe coupling according to the invention by the following measures:

The two pipe sleeves α are widened conically at their butt ends (Fig. 3) and surrounded by a double conical ring h by pressing, but in such a way that both pipe sleeves a can still easily be twisted against each other by means of two hook wrenches. As is known, by rotating the tubular sleeves α, there is a change in cross-section in the coil diameter of the helical ribbon spring b and, at the same time, an extension of the latter.

This has the effect that the tube sleeves α experience a pressure in the axial direction and the cones of the tube sleeves α come into gradually stronger friction with those of the double- conical ring h. In this way, the twisted position of the spring winding is secured in every position.

It can happen that when connecting two tubes d the latter do not collide in the middle of the tube connection, but, be it due to carelessness or the like, leave a larger gap free. When the pipe connection is tightened, the turns of the helical band spring b located above the space would then slide into the space, damage the sealing sleeve g and render the connection unusable. For this case, an open cover ring e of sufficient width is provided, which is mounted between the helical band spring b and the sealing sleeve g and covers any gap that may be present (FIG. 3). The cover ring e is preferably made of weak spring band steel of sufficient width.

Claims (4)

Patent claims: 1. Threadless quick-release pipe coupling with a sleeve made of elastic material which surrounds the pipe ends and is wrapped in spring windings, the whole being surrounded by two pipe sleeves, characterized in that the pipe sleeves (α) widened conically at their butt ends and enclosed by a double conical ring Qi) are. 2. Threadless quick-release pipe coupling according to claim 1, characterized in that when the pipe sleeves (α) are rotated against each other, the pipe sleeves (α) experience a pressure in the axial direction and the cones of the pipe sleeves (α) come into greater friction with those of the double-conical ring (h) , whereby the twisted position of the coil spring (b) is secured in every position. 3. Threadless quick-release pipe coupling according to claim 2, characterized in that the elastic sleeve (g) is enclosed in the middle by an open spring ring (e) of sufficient width, which leaves any space at the butt ends of the pipes to be connected (<f) bridged. 4. Threadless pipe quick coupling according to claim 3, characterized in that the outer ends of the pipe sleeves (α) are flanged inward, so that annular grooves (c) are created which are used to attach the coil ends of the coil spring (&) by pressing the annular grooves together , (c) the spring ends of the coil spring (b) form a firm connection with the tube sleeve ends, this firm connection being further supported by the fact that the spring ends are provided with small barbs (/) which are inserted into the material of the Press in pipe sleeves. 1 sheet of drawings @ 609 659/250 10.56 (609 863 4.57}