Hose clamp
Hose clamps (also hose clamp , in Switzerland usually clamps or hose clamps called) attach a hose end to a fixed line or to a hose connector .
construction
Hose clamps consist of a ring-shaped metal band, a wire or double wire, and more rarely made of plastic. The clamp usually has an adjusting screw for tightening. This is attached so that the inside diameter of the hose clamp is reduced by turning the adjusting screw. As a result, the hose below is pressed onto the connection piece and seals with it.
Hose clamps are mainly used in the sanitary sector , in automotive engineering and in mechanical engineering . They are usually manufactured according to DIN 3017 and are made of metal.
Lumley Robinson, the founder of L Robinson and Company , is considered to be the inventor of the classic worm screw clamp (brand name Jubilee ) in 1921.
Types of hose clamps
- Worm thread clamps have a metal band. This is continuously perforated, the screw turns of the adjusting screw each engaging in the individual oblique-oval-elongated holes of the perforation. Alternatively, indentations or elevations are continuously embossed into the tape, the slightly inclined grooves of which serve as mating threads for the screw. This version is considerably more resilient than the perforated version. Worm thread clamps are used to fasten smooth hoses. They have the disadvantage that the thread consisting of notches is less resilient than z. B. a normal full thread. The advantage is the usually large adjustment range and the inexpensive production.
- Double wire clips do not have a metal band, but instead have two wires. To tension the wires, a screw with a nut is used, the end of which usually acts in the direction of pushing. Double wire clips are used to attach spiral hoses .
- Tubular tape is a smooth metal tape that is held together by a lock that works on the tensioning belt principle , i.e. by rolling it over a slotted core and a ratchet as a detachable backstop.
- Pivot bolt clamps are made from a metal band that has two bolts folded into the band. One bolt has a thread that is perpendicular to the longitudinal axis, the other a through hole. The clamp is tensioned by a screw pulling the two bolts together. These clamps have the advantage that they can be reused very often without wearing out in a way that adversely affects their function. The metal band is slit in the middle in the area of the band envelopes for the passage of the screws, the band ends are fixed by welding points.
- Spring hose clamps , also known as spring band clamps or spring band clamps , are designed as springs. They are widened for assembly by means of spring band clamp pliers by pressing the tabs together, and when the pliers are released they close automatically around the hose due to their spring force. Spring hose clamps can be designed as a metal band, single wire or double wire. The achievable clamping force depends on how the dimensions of the spring hose clamp (wire thickness or width and thickness of the spring steel band, diameter) are matched to the application. The achievable clamping force limits the application on hose connections up to a maximum overpressure of approx. 10 bar, depending on the version. Spring hose clamps have the advantage over the other types that the clamping force is retained even under dynamic stress (pressure pulsation, vibration, temperature changes, etc.). B. is common in vehicle manufacturing.
- Nylon hose clamps have sawtooth-shaped barbs at both ends that lock into place when pressed together.
- Cable ties are also rarely used as hose clamps and are accordingly referred to as hose ties .
- Multiple hose clamps are used to organize movable sections of hose lines in order to avoid chafing and tangling, such as the outward and return lines of hydraulic cylinders on excavator joints, feed lines for fuel gas and oxidizing gas to gas blower torches for soldering and oxy-fuel torches. Also for organizing power supply and control lines on articulated trucks and gantry cranes.
Web links
Commons : Hose Clamps - Collection of pictures, videos and audio files
Individual evidence
- ↑ L Robinson & Co and the finest worm drive hose clip in the world. Information page on the website of L Robinson & Company, accessed on August 28, 2011