Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1987-04-24
1989-04-11
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24 20S, 24279, B65D 6300
Patent
active
048193070
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a hose clamp for connecting flexible hoses to inflexible pipes, spigots, nipples or the like, to give a liquid-tight connection between the two.
Although the hose clamps of the invention may find application for the connection of hoses carrying low pressure supplies such as the water supplies to domestic washing machines and the like, the main intended of application is in medium pressure environments where the pressure may be around 30 to 50 lbs/sq. inch, such as is found in the cooling and lubricating systems of trucks and railway engines. Currently available clamps of the type aforesaid suffer from the disadvantage that the period for which they maintain liquid-tight connection is limited and that period is of uncertain duration and depends, at least in part, on the amount of usage to which the clamp has been subjected. It is, therefore, necessary that clamps in use be installed in an overtightened condition, routinely retightened or that they be periodically inspected an retightened as may be found necessary. None of these approaches is entirely satisfactory: initial overtightening may damage the hose and cause leakage and routine inspection and retightening is time-consuming and expensive in manpower costs. In any case, even with routine inspection, leaks may occur between inspections and may only become manifest when the vehicle is about to begin duty leading to delay and its associated expense.
An object of the present invention is to obviate or mitigate the aforesaid disadvantages.
According to the present invention there is provided a hose clamp comprising a loop for encircling and clampingly engaging an overlapping junction between a hose and a pipe end extending into the hose, disengageable means resisting enlargement of the loop diameter and self-adjusting means for reducing the loop diameter in response to relaxation of tension in the engagement between band and hose below a preselected value.
Thus the clamp will be tightened if the tension falls below a preselected value by shortening of the circumference of the loop to reduce its diameter. Slackening of the clamp is resisted by, for example, a ratchet arrangement, facility for disengaging the resisting means being provided to permit fitting and removal of the clamp but, in use, only unidirectional movement in the direction which tightens the clamp is permitted.
Preferably, the loop is a circle of metallic wire having a spring bias towards a diameter smaller than that of the hose, said loop having contiguous overlapping portions provided with mutually engaging ratchet teeth to resist enlargement of the diameter of the loop. Free end portions of the circle may have radially outturned lugs to facilitate disengagement of the ratchet for installation and removal of the loop.
Alternatively, the hose clamp may comprise a circular hose-encircling band having contiguous overlapping end portions and a generally centrally located toothed or sprocketed track running longitudinally along the length of the band, a rotatable worm drive engaging the track and providing the means for tightening and resisting slackening of the band and including self-acting means for tightening the band in response to relaxation in the engagement between band and hose.
In another embodiment of the invention, a hose clamp comprises a hose-encircling band, a frictional roller mounted on one free end of the band and frictionally engaging the other free end and means for tightening the band by drawing one free end past or winding around the roller.
This invention is particularly, but not exclusively, concerned with the prevention of leaks which occur axially from the junction between hose and pipe and is based on observations of the timing of the occurrences of such leaks. It has been observed that axial leakage appears to occur after a period of non-use of the installation, for example, at first start-up after a weekend shut-down. The invention is also based on the discovery that the leaks are caused by gradual creep of the material of construction of t
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patent: 4429847 (1984-02-01), Jablonski et al.
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