Fluid handling – With repair – tapping – assembly – or disassembly means – Tapping a pipe – keg – or apertured tank under pressure
Patent
1989-03-28
1990-02-13
Walton, George L.
Fluid handling
With repair, tapping, assembly, or disassembly means
Tapping a pipe, keg, or apertured tank under pressure
81 309, 81 342, 811763, 137321, 220284, 220326, F16L 5510, F16K 5100
Patent
active
048997803
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for use in connection with tapping off fluid from or filling fluid into a container through an internally threaded tapping or filling hole provided in a wall of the container and adapted to be closed by means of an externally threaded generally cup-shaped plug having an outwardly open cavity for receiving an implement serving to rotate the plug.
More particularly, the invention relates to such a device of the kind comprising a bell-like housing which is adapted to be removably mounted with an open end thereof over said hole and which is provided, in its wall, with an opening through which fluid may be fed into or discharged from the housing, and a tool for manually operating the plug from a position outside the housing, said tool comprising a shaft which extends slidably and rotatably through a portion of the housing, located opposite to the open end of the housing, and which is provided with a handle at the end thereof located externally of the housing, while, at its other end, it is provided with a plug holder comprising a body, carried by the tool shaft, and two gripping jaws which are mounted for limited movement in said body and which are provided with gripping portions insertable into the cavity of the plug and movable between retracted inner end positions and expanded outer end positions, the gripping jaws being arranged to be brought into contact under pressure against two opposite portions of the side wall of said cavity by means of said gripping portions.
First of all, devices of said kind are used in connection with tapping off fluid from or filling fluid into drum-shaped containers through bung holes adapted to be closed by means of bungs. In this connection, said devices make it possible to avoid that the personnel carrying out the tapping or filling operation will run the risk of coming into direct contact with the fluid in question.
Through GB-B No. 2 006 723 and GB-B No. 2 055 355 two devices of said kind are previously known. In each of said two known devices, the gripping jaws are formed by axially aligned straight pins which are spring-biased towards retracted inner end positions from which they may be moved to expanded outer end positions by means of a manually operable actuating means formed by a cam member contacting the inner ends of the two pins. In practice, this construction of the plug holder has been found to cause manifest disadvantages. Especially, it has been found that the plug holders of said known devices are not suited to be used for handling other plugs than those where the diameter of the cavity of the plug is only slightly smaller than the distance between the gripping portions of the two gripping jaws when said gripping portions are in their outer end positions. However, in the market, there exist several different types of plugs where the diameter of the cavity varies considerably from one type of plug to another although they are all intended to be utilized for closing internally threaded holes of the same size. The reason for those large variations in the diameter of the cavity, which may amount to about 10 millimeters, is to be found in the fact that the plugs are made from different materials and by different manufacturing methods.
The invention has for its object to provide an improved device of the kind initially specified where the plug holder is well suited for handling plugs having strongly varying diameters.
According to the invention, for the above purpose, there is proposed a device of said kind which is primarily characterized in that the gripping portions of the gripping jaws are arranged to be moved from their inner end positions to their outer end positions through the action of spring forces applied on the gripping jaws from spring means incorporated in the plug holder.
The above construction of the device results in that the gripping jaws may be brought into resilient contact with the side wall of the cavity in the plug instead of into substantially rigid contact with said wall as in the case of the above kn
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patent: 2866574 (1958-12-01), Roumeliots
patent: 3084828 (1963-04-01), Davies
patent: 4214599 (1980-07-01), Astrom
patent: 4339098 (1982-07-01), Tardot et al.
patent: 4351446 (1982-09-01), Madden
patent: 4420012 (1983-12-01), Astrom
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