DE2401505B2 - CONNECTING CONNECTIONS FOR LINES MADE OF FLEXIBLE MATERIAL - Google Patents

Description

40

The invention relates to easily and any number of times producible and detachable connection connections for Lines made of flexible material for guiding gaseous or liquid media in pneumatic or hydraulic control systems, e.g. B. made of plastic, rubber, etc., in the form of a connecting piece that surrounds the line end, from free axial end longitudinally slotted resilient collet chuck with conical outer surface and a clamping device that can be axially displaced between an inoperative position and an active position and has locking ring, which in its operative position at the end of the conical outer jacket surface with a securing area of the collet cooperates

A connector of this type is known from US Pat. No. 2,868,564. In this connection connector, the diameter of the conical Outer jacket surface of the collet from the free axial end, d. H. the clamping and locking ring is by moving in this direction into its effective position, in which it is relatively far inward sits on the collet in the area of the slot ends. For this reason, the clamping and locking ring engages with a short one in the effective position Lever arm on the collet elements separated from each other by the slots. Therefore must to clamp the collet a relatively great force is expended as a result this tensioning is relatively uncontrolled in terms of force. Large elastic rings also act on the tensioning and securing ring in its operative position Opposing forces that eic unintentional loosening, e.g. B. at pulsating loads, favor. These disadvantages are now indeed reduced in the known arrangement in that the slots in the amount of a tapered and therefore more elastic zone of the collet end, which extends in the axial direction over the Securing area extends beyond the collet, and that the clamping and locking ring is held in its operative position by a locking device. However, this results in an axial lengthening of the connecting piece and a more difficult release of the clamping and locking ring accepted its effective position. In addition, the connector requires according to the US-PS 28 68 564 for connecting a line made of flexible material to catch the large Tensioning forces an inner tube inserted into the line, which is not only an additional part but also a Represents flow resistance, which increases when a predetermined amount of medium flows through conditional on the dimensions of the connector

Au:, it follows that the known connection connector has disadvantages that make it particularly suitable for use in pneumatic or make hydraulic control systems unsuitable.

The invention has therefore set itself the task of providing a connection of the type mentioned to create, which despite their few parts, the pulsating loads occurring in pneumatic or hydraulic control systems and cramped Takes space into account

According to the invention, this object is achieved by the combination of the following characteristics which are known per se solved:

a) The collet is designed as a plug-in socket,

b) the conical outer surface of the collet increases towards the free axial end Outer diameter,

c) the securing area has a reduced slope compared to the conical outer jacket surface, on which the locking ring holds by self-locking

The design of the collet as a plug-in socket, i.e. without an inner tube, which itself is derived from the DT-OS 22 02 354 is known, not only ensures the formation of the connecting piece from only two parts, but has the advantage of making optimal use of the inner diameter of the hose. The latter meets Although also for the device according to DT-OS 22 02 354, there is the Anctilußverbindungsstück from at least three parts, namely from one unslit connection sleeve with inner sawtooth projections, one on the free end of the sleeve butting slotted grip ring with also inner tooth projections and one on the free one The end of the sleeve can be screwed on, the grip ring narrowing the clamping ring.

As a result of the feature b) known per se from FR-PS 12 96 895, the clamping and Circlip in its effective position with a large lever arm on the collet elements, see above that by the reverse arrangement in the connection according to US-PS 28 68 564

_& Disadvantages in omission and the

"" ^ Teii spatial conditions are taken into account. The outside diameter of the collet, which increases towards the free axial end, also prevents this jit connected line an inevitable loosening s Clamping and locking ring from the connection piece, so that the clamping and locking ring does not rloren can go. Although these advantages also apply to the device according to FR-PS 12 96895, the The yoke is not designed as a plug-in socket, but rather a ί collet for attaching a flexible line T an inner tube inserted into the end thereof, the effective position of the clamping ring being no Is provided on the collet chuck I Also known from DT-OS 2040 260 ierkmal c) takes into account the cramped space conditions and also guarantees one Reliable security against unintentional loosening when the sights are loaded, without making the tin difficult transfer the clamping and locking ring from its effective to its ineffective position in purchase take is the device known from DT-OS 20 40 260, in which these advantages also occur, is, however, again not designed as a plug-in socket but as a collet for attaching a flexible conduit on an inner tube inserted into its end, the diameter of the conical The outer circumferential surface of the collet increases from the free axial end and an unintentional loss of the Clamping and locking ring only before using the device for the first time as a predetermined breaking point formed material connection between collet and ring is ensured.

The connection connection according to the invention is very simple and quick and easy to use handle, and it can also be used to create a secure connection, provided that must be that the hoses or the hose ends in the radial direction a sufficient Have rigidity, which is readily available with the plastic hoses commonly used. The secure mounting is also ensured that the pliers legs from all sides pressed against the hose evenly and with the same force.

The collet, like the Her clamping and locking ring, can be made of a suitable plastic, however, it can also be made of steel or brass if the dimensions are suitable takes place in particular with respect to the pliers legs

The invention will now be described with reference to the drawing. It shows

F i g. 1 the end view of a connection connection according to the invention,

F i g. 2 the connection according to FIG. 1 in longitudinal section and

F i g. 3 shows a variant of the arrangement according to FIG. and 2 in longitudinal section

The in the F i g. 1 and 2 shown connection connection in the form of a connection connector consists of two parts, namely a collet 12 designed as a plug-in socket, with which a fastening part is firmly connected, which has a screw socket 14 serving for example for connection to a fixed metallic line and a flange 16, as well as a clamping and locking ring 18 that can be axially moved back and forth along the outer circumference of the collet chuck 12. The collet chuck is slotted from the free end and has several resilient pliers legs that are approximately evenly distributed over the circumference and are pressed inward when clamping and in doing so, grasp the end of a line 7 in a uniformly resilient manner from all sides. In the present special exemplary embodiment, the collet 12 comprises four pliers legs 12a to 12ct which are separated from one another by slots 13. The slots 13 end at base surfaces 13a running in the radial direction. The connection according to FIG. 1 and 2 consists of rotationally symmetrical parts. In the installed state, the screw socket 14 of the fastening part is usually - as already indicated above - connected to a fixed metal line or screwed into the wall of a pneumatic or hydraulic component, for example into the cylinder head of a cylinder unit, with the flange 16 as a stop and for additional purposes serves mechanical stabilization or possibly also be designed as a hexagon and can be used for operation.

If the connection is to be made with a compressed air or pressure medium hose, the Tension and locking ring 18 initially brought into an inoperative position, which is approximately the location of the Base areas 13a of the slots 13 between the pliers legs 12a to 12d correspond. But he can may also be pushed back up to the flange 16. This makes the collet 12 complete open because in this inoperative position of the clamping and locking ring 18, the pliers legs 12a to 12d are free of the clamping and locking ring »8, so that the Hose end can be inserted. The clamping and securing ring 18 can then in the axial direction shifted and over the conical outer jacket surface 9 of the collet 12 away in the in F i g. 1 shown effective position are brought. Here, the conical outer jacket surface 9 of the collet has a towards the free axial end increasing outer diameter, so that the transfer of the clamping and Retaining ring takes place in its effective position in the direction of the axial end. To the conical Outer jacket surface 9 is followed by a securing area 8 of the collet, which opposite the conical Outer jacket surface 9 has a reduced slope. On this securing area 8 the tensioning and locking ring 18 without additional precautions by self-locking.

If the clamping and securing ring 18 is in its effective position, it is used as a plug-in socket trained collet 12 more or less completely closed, so that the inserted The end of the hose is secured against sliding out Teeth 26 on the inside of the axial bore of the collet 12 are increased. On the inside of the Collet 12 is also expediently provided a shoulder 20, dis opposite the base 13a of the slot 13 between the pliers legs is offset inwardly. This shoulder 20 serves as an axial one Stop for the hose 7 when it is inserted into the socket. Since the slots 13 between the 65 pliers legs do not extend to the shoulder 20, it is also ensured that the plug connection is sufficient is tight, as the hose adapts to it under the effect of the overpressure inside it

24 Ol 505

its front end surrounding closed circumferential surface creates a seal

The embodiment shown in Figure 3 differs differs from the connection described above essentially in that here the line 25 ends at the base 27 of the slots between the pliers legs and that the inside of the axial bore of the collet is not provided with teeth but is smooth

1 sheet of drawings

Claims (2)

Patent claims: ! Easily and any number of times to produce and detachable connection connections for lines flexible material for guiding gaseous or liquid media in pneumatic or hydraulic control systems, e.g. B. made of plastic, rubber, etc., in the form of a connecting piece, the one surrounding the line end, from free axial end longitudinally slotted resilient collet chuck with conical outer surface and one axially displaceable thereon between an inoperative position and an operative position Has clamping and locking ring, which is in its operative position at the end of the conical Outer jacket surface interacts with a securing area of the collet, characterized by the combination of the following well-known features: a) the collet (12) is designed as a plug-in socket; b) the conical outer jacket surface (9) of the collet faces the free axial end increasing outside diameter; c) the securing area (8) has a reduced surface area (9) compared to the conical outer jacket surface (9) Incline on which the locking ring (18) holds by self-locking 2. Connection according to claim 1, characterized in that a shoulder (20) is provided on the inside of the plug-in socket (12) which is opposite the base (iSa) of the pliers legs (12a to I2d) separating slots (13) of the plug-in socket (12 ) forming collet is offset inwards.