Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1994-04-01
1995-12-12
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24279, B65D 6300
Patent
active
054737982
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a hose clip comprising a metallic housing, which has a bearing part for supporting a band-tightening screw and a saddle, and an annularly curved flat metal band, which near its one end is rigidly connected to the saddle and can be guided with its other, free end through a band channel of the housing, and which has a grid-like sequence of perforations or slots with transversely inclined shoulders for engagement by a thread of the band-tightening screw, which thread is arranged in the saddle area of the housing.
In common hose clips, where the saddle and the housing are connected in one piece with one another, joints are mostly secured by bent tabs, while the band in the band channel is positively connected to the housing. The known hose clips have mainly disadvantages in the finishing technique, since the saddle mounting on the band, the introduction of the screw, the mounting of the housing and the closing of the housing are relatively complicated and not fully automated operations. To improve the finishing technique, resistance welding (spot welding) has already been utilized for connecting the housing to the band, which, however, permits only overlapping welds. Furthermore, resistance welding is not satisfactory with respect to process safety since nondestructive testing during the welding operation is not possible, and the weld seams can therefore only be tested by random sampling. A further disadvantage of this connecting technique is seen in bulges or recesses being formed in the area of the weld seams, which bulges or recesses cave-in during fastening of the hose clips to the hose material, and can thereby result in breakdowns in operation, in particular in an early wear.
Starting out from the above, the basic purpose of the invention is to develop a novel hose clip, which can be manufactured easily and automatically and at the same time meet the high demands regarding process safety and operational reliability.
To attain this purpose, the invention suggests that the housing is designed as a one-piece bent stamped part, which is joined at joints in the area of the bearing part and/or the saddle by means of at least one line-like or spot-like laser welding seam and/or is connected to one band end. Extensive tests have shown that bulge-free, recess-free and shoulder-free welds are possible with the laser welding technique also in the area of joints, a basic condition for use in hose clips. Only with this is it possible to weld bulge-free and recess-free from the easily accessible inside of the band (thus from the side, which later rests against the hose surface). Through the possibility of a break-down-free on-line monitoring of the laser welding seam, a high degree of process safety during automatic manufacturing is achieved. The welding operations, which are relatively easy to carry out, finally make it possible to manufacture the housing, in spite of its complicated outer design, as a one-piece bent part or a bent stamped part (instead of the otherwise common deep-drawing parts), with accordingly lower manufacturing and tool input and shorter cycle times.
A preferred embodiment of the invention provides that the saddle and/or the bearing part have bent plates, which are arranged in pairs mirror-inverted with respect to one another and are bent toward one another forming a joint, preferably aligned in the longitudinal direction of the band, which plates are connected to one another in pairs at their joints by laser weld seams. The adjacent bent plates of the saddle and of the bearing part are thereby advantageously separated from one another by a transverse notch forming a band outlet of the band channel.
According to a preferred embodiment of the invention, the one band end is butt-welded with its free front edge to the saddle edge on the side adjacent the bearing part, preferably from the inside of the band by means of a laser welding seam. To better support the band end introduced into the band channel, a freely projecting tongue, preferably curved in the dire
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patent: 3840018 (1974-10-01), Heifetz
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patent: 3924308 (1975-12-01), Duprez
patent: 4099304 (1978-07-01), Luc
Mills K. Welding, Brazing, Soldering, Metal Handbook, vol. 6, Edition 9; 1983.
Baumann Artur
Geiger Manfred
Pebra GmbH Paul Braun
Sakran Victor N.
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