Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1985-09-20
1987-01-27
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24 20CW, 24279, 24283, B65D 6302
Patent
active
046385312
DESCRIPTION:
BRIEF SUMMARY
The subject invention concerns an improved hose clamp of the kind comprising a strip of material which is bent to annular shape to form a tightening band. One end portion of the band is provided with transverse grooves in which engage the threads of a screw worm which is rotatably journalled in a sleeve but axially non-slidable therein. The sleeve encloses the screw worm and is formed with a space allowing the threaded band end portion to be moved out of the sleeve upon rotation of the screw worm therein. The opposite band end portion is fixed to the sleeve.
In prior-art hose clamps of the kind referred to above some leakage is sometimes found. Often the cause of such leakage is ageing of the material of the hose which is mounted by means of a hose clamp so that after some time of use the hose material loses its pliability and elasticity. After a certain period it is therefore necessary to re-tighten the hose clamp and eventually the hose must be exchanged. However, it this is done incorrectly accidents or damage may occur. The problem is particularly common in the engine space in cars, where several hoses are fastened with the aid of hose clamps and where the environment causes considerable problems on account of the large variations in temperatures and of the presence of various liquids, such as petrol, oil, hydraulic fluids, glycol, alcohols and water. Furthermore, vibrations and oscillations of varying frequencies also contribute to the generation of leakage.
One way of counter-acting the generation of leakage in hoses mounted by means of hose clamps is to increase the clamping action of the clamp by tightening the screw worm very hard. Clamp hose manufacturers have endeavoured for many years to produce stronger and more efficient hose clamps. However, when a hose clamp is tightened hard it is inevitable that the clamp bites increasingly deeper into the hose material, which together with the vibrations and the tensile stress to which the material is exposed is liable to cause cracks in the hose material adjacent the clamp. The result is yet another problem.
A more efficient method of obviating the ageing problems found in hose material in order to achieve a permanent clamping action in hose clamps is to provide the clamp with some kind of resilient means. DE-A-1 No. 3130092 discloses a hose clamp the tightening band of which encloses a pressure strap and has a pleated or corrugated configuration. Owing to this configuration the tightening band assumes an elasticity in its lengthwise extension and in this manner becomes capable of compensating for the decreasing elasticity of the hose enclosed by the hose clamp.
One disadvantage inherent in the wavy or corrugated configuration of the tightening band wherein the corrugations extend towards and away from the pressure strap positioned interiorly thereof is, however, that dirt particles may enter between the ridges and dales of the corrugations and the pressure strap. When this happens the strap loses at least part of its resilient properties.
By giving the tightening band an undulating configuration it is also, however, weakened. Consequently, the band must be made thicker than what is normal in order to compensate for the weaker structure and as a result the clamp becomes more expensive to manufacture.
The purpose of the subject invention is to provide a hose clamp possessing resilient properties without the disadvantages outlined in the aforegoing. This is achieved in accordance with the teachings of the invention therein that the tightening band enclosing a pressure strap bent to annular shape and having its end portions overlapping and arranged to form a guide means to the screw worm sleeve and the tightening band between said sleeve and said band and an enclosed article, describes an arcuate line in the plane of the external face of the pressure strap along the major portion of the circumference of the latter.
The clamp in accordance with the invention will be described in closer detail in the following with reference to the accompanying drawings, whe
REFERENCES:
patent: 492855 (1893-03-01), Weidaw
patent: 1705895 (1929-03-01), Blair
patent: 1947715 (1934-02-01), Heuer
patent: 3398440 (1968-08-01), Bergstrom
patent: 3924308 (1975-12-01), Duprez
patent: 4024609 (1977-05-01), Haynes
patent: 4308648 (1982-01-01), Fay
Allmanna Brandreskapsaffaren AB
Sakran Victor N.
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