Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Frangible member
Patent
1986-03-18
1987-12-29
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Frangible member
411 50, 411 80, 411913, 166215, F16B 1304, E21B 2300
Patent
active
047157550
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a securing device for securing in cavities and comprising a number of clamping jaws provided under influence of a changeable tension body to expand against opposite wallportions in said cavity, said clamping jaws having engagement surfaces which are forced outwards and tension surfaces, provided to cooperate with a tension surface of the tension body which by means of a displacement motion of the clamping jaws relative to the tension body is brought to adjust the clamping jaws between an inner, releasing position and an outer, expanded securing position.
TECHNICAL PROBLEM
It is prior known with different embodiments of securing devices of the type expanding devices for the purpose of securing objects. For certain objects difficulties can arise to adjust the expanding devices to expanded position because of poor acessability, for example when a device is to be secured in a cavity under ground level, for example in a longitudinal bore, a tube or similar. Especially securing pumping devices in bore cavities or pump tubes has been a great problem because of the poor accessability to the securing place.
THE SOLUTION
The object of the present invention is to eliminate the above described difficulty by means of a securing device which is characterized by said device comprising a spring mechanism, provided to press the clamping jaws in direction against the tension body, and a distance element, positioned between the clamping jaws and the tension body, said distance element being provided to maintain in its releasing position a predetermined distance between a support surface of each clamping jaw and a surface of said distance element, which is made of a material changeable by means of the environmental influence as to shape, so that after a certain time interval said distance will be considerably reduced, resulting in said displacement motion of the clamping jaws relative to the tension body, so that the expanded securing position will be automatically taken with a time delay, counted from the time, when said environment influence is initiated.
BRIEF DESCRIPTION OF DRAWINGS
The present invention will in the following be further described in an embodiment with reference to the accompanying drawings on which
FIG. 1 shows a partly broken sectional view through the securing device according to the invention in a releasing position,
FIGS. 2, 3 and 4 show different parts included into the securing device,
FIG. 5 shows the securing device in an expanded securing position and
FIG. 6 shows a way of using where the securing device secures a pumping device in a bore hole.
PREFERRED EMBODIMENT
The securing device 1 according to the present invention is of an expandable type and comprises a support plate 2, which is suitably circular and has a peripherical step 3 which forms the seat for a powerful pressure spring 4. At the support plate a bracket 5 for a wire wheel 6 is connected which by means of a shaft 7 is pivotally journalled in the bracket. A rod or shaft 8 is secured to the support plate 2, said shaft being directed downwards from said plate and extending centrally and being provided at its bottom end with a threaded portion 9 on which a tension nut 10 is screwed. The support plate 2 and the shaft 8 are shown separately in FIG. 2. The securing device consists further of a number, in the shown example four clamping jaws 11, the embodiment of which also is apparent from FIG. 3. The clamping jaws have a wedge shaped cross section with an outwardly faced engagement surface 12 for engagement against the surface 13, against which the securing device is to be secured. This surface 13 is in the shown example the cylindric inner surface of a cylindric tube 14, for example a bore tube for lining a bore hole for the purpose for example the supply of water. Therefore the engagement surface 12 is substantially designed cylindrically, but extends over merely a part of the periphery of the cylinder, at the most a fourth of the periphery in the case with four clamping jaws
REFERENCES:
patent: 3078862 (1963-02-01), Maly
patent: 3158059 (1964-11-01), Myers
patent: 3556216 (1971-01-01), Condra
AB Holmgrens Armaturfabrik
Smith Gary L.
Wilson Neill
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