A quick connect coupling for transmitting fluids includes a tubular housing and spread locking elements fixed on the housing for connection to a correspondingly formed connector. A sealing piston is slidable centrally in the housing for engagement with the connector and surrounded by an axially movable sliding sleeve. The sliding sleeve retains the locking elements in the locking position in the coupled position of the quick connect coupling.A reliable quick connect coupling has to be provided by such quick connect couplings, for transmitting a fluid from a pressure source, for example a refilling cylinder or a pressure tank. Simple, problem-free operation of the quick connect coupling is particularly important, so that problem-free handling is made possible, even under unfavorable conditions, such as with dangerous fluids or high connection pressures. Accordingly the quick connect coupling is based on the object of providing a quick connect coupling of the kind initially specified which facilitates particularly reliable and simple handling with a simple structure. This object is met by a quick connect coupling for transmitting gaseous or liquid fluids. The quick connect coupling includes a tubular housing, spread locking elements fixed on the housing for connection to a correspondingly formed connector, and a sealing piston slidable centrally in the housing for engagement with the connector. The sealing piston is surrounded by an axially movable sliding sleeve which retains the locking elements in the locking position in the coupled position of the quick connect coupling. Preferred developments of the quick connect coupling form subject matter of research.
The proposed quick connect coupling is distinguished by simple operation, which is also particularly reliable, since it can be coupled up and uncoupled with hardly any force. This proposed quick connect coupling is suitable for different connectors, especially for connecting nipples of gas tanks and for gas cylinder valves. Through the sealing piston which can slide or telescope in the housing, a more secure engagement of the locking elements, especially of the collet jaws, since the engagement profile of the collet jaws automatically adapts to the corresponding interlocking engagement profile of the complementary connector by virtue of the ability of the sealing piston to slide and the locking elements, especially the collet jaws are locked independently of the sealing piston. This is especially important, since the corresponding connection nipple can be made relatively simple. Because of the ability of the sealing piston to slide axially, a reliable, tight engagement between the engagement profile and the sealing surface at the end surface of the quick connect coupling results and only then does the outlet or check valve coupled thereto open. In particular excessively canted application of the coupling is avoided by this, i.E. The user is constrained to correct fitting, since both the opening of the fluid passage and also the coupling up at the coupling side are otherwise prevented. Wear of or damage to the connecting profile is also reliably avoided through this, on both the coupling and the nipple side.
