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Publication numberUS2828586 A
Publication typeGrant
Publication dateApr 1, 1958
Filing dateJun 28, 1956
Priority dateJun 29, 1955
Publication numberUS 2828586 A, US 2828586A, US-A-2828586, US2828586 A, US2828586A
InventorsErnst Granacher, Friedrich Frosch, Heinz List
Original AssigneeBuss Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Arrangement for grinding the inside walls of cylindrical containers
US 2828586 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

April 1, 1958 H. LIST ET AL 2,828,586

ARRANGEMENT FOR GRINDING THE INSIDE WALLS OF CYLINDRICAL CONTAINERS Filed June 28, 1956 ERNST GRANACHER ilniteti States Patent ARRANGEMENT FUR GRINDING THE INSIDE WALLS OF CYLINDRICAL CONTAINERS Heinz List and Friedrich Friisch, Pratteln, Switzerland, and Ernst Granacher, Sackingen, Germany, assignors to Buss A. G., Basel, Switzerland Application June 28, 1956, Serial No. 594,514

Claims priority, application Switzerland June 29, 1955 1 Claim. (Cl. 51-141) In the manufacture of chemical apparatus in particular, the necessity arises for grinding the inside walls of cylindrical containers of all kind which are made of stainless steel, since thereby the resistibilty of the material against the corrosive action of the chemical substances is considerably increased.

To such end, the walls of drums and the like have so far been ground with the aid of electrically operated and manually guided grinding means. The operator together with his grinding apparatus was positioned inside the drum and wearing a protective mask against the development of dust, had to perform this operation in a tedious and time-c0nsuming manner. Such grinding operation was expensive and even dangerous when carried out without any protective mask. The resulting grinding pattern was irregular.

The present invention provides an arrangement for grinding the inside walls of cylindrical containers which permits the above mentioned disadvantages and drawbacks to be avoided. This arrangement is characterized by a grinding apparatus mounted on an arm which automatically performs a limited reciprocal movement.

A preferred embodiment of the invention is illustrated, by way of example, in the accompanying drawing, in which- Fig. 1 is a side view of the arrangement, and

Fig. 2 is a front view thereof.

The arrangement comprises a frame a with vertical guides b in which is guided a slide 0 being vertically adjustable by means of a spindle d. In slide c is mounted a horizontal arm e which is reciprocated via a variable ratio gearing f, the speed of this arm and thus of the grinding operation being variable. In the terminal positions of arm 2 the movement thereof is interrupted by limit switches g and dogs h which are adjustably mounted on the arm. This results in an automatic reciprocating movement of arm e.

On the forward end of arm e is disposed a grinding apparatus i of a construction known per se which is driven by an electric motor k. Grinding apparatus i and motor k are mounted on a cantilever lin flexible bearings m, for example by using rubber sleeves. The pressure under which the grinding tape 0, which is trained over a wheel n, is urged against the interior wall p of the drum, depends on the dead load of apparatus i and motor k. This pressure may be still further increased, also during the grinding operation, by angularly moving about its own axis the cantilever l on which are disposed the flexible bearings m, by means of a handwheel q.

The drum wall is constructed of circularly rolled sheets, and consequently the drum inside diameter is not absolutely uniform. By virtue of mounting the grinding apparatus i in the flexible bearings m, however, the grinding tape 0 nevertheless can adapt itself to these deviations from the theoretical diameter.

The pressure of the grinding apparatus on the drum wall acts downwardly and is accommodated by the rolls r of a drum-rotating device s of a construction known per se, which is driven by variable ratio gearing t, whereby the rate of grinding may also be varied.

A suction device it which is only schematically shown, serves the purpose of rapidly removing the metal dust produced by the grinding operation.

What we claim is:

Apparatus for grinding the inside walls of cylindrical containers comprising an external support for the container to be ground, a frame adjacent said support, external vertical guides on said frame, a slide mounted on said guides, a motor and gearing mounted on said slide, a cross-arm extending on one side of said slide into the cylindrical container to be ground and mounted on said slide for limited reciprocal movement by said motor and gearing, a cantilever arm mounted on the end of said cross-arm projecting into the cylindrical container, said cantilever arm and cross-arm having parallel axes, means on said cross-arm for adjusting the distance between the axes of said cantilever arm and said cross-arm, resilient bearings on said cantilever arm, and an internal grinding apparatus and a motor therefor mounted in said resilient bearings on said cantilever arm, said grinding apparatus comprising an endless grinding belt.

References Cited in the file of this patent UNITED STATES PATENTS 2,279,782 Fowler Apr. 14, 1942 2,445,391 Elmes et a1. July 20, 1948 2,470,221 Mott May 17, 1949 2,768,481 Thomasco Oct. 30, 1956

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2279782 *Feb 12, 1938Apr 14, 1942Bert F FowlerSurface finishing apparatus
US2445391 *Sep 4, 1946Jul 20, 1948Walter L RymanGrinding machine
US2470221 *Apr 2, 1945May 17, 1949Int Harvester CoApparatus for and method of dressing cylindrical surfaces
US2768481 *Aug 13, 1954Oct 30, 1956Thomasco Paul RBelt sander attachment
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3116572 *Jun 30, 1959Jan 7, 1964Hi Lite Polishing Machine CompApparatus for polishing articles
US4229908 *Oct 24, 1978Oct 28, 1980Breda Termomeccanica S.P.A.Apparatus for automatic joint machining in heavily thick cylinders
US6001006 *Nov 4, 1997Dec 14, 1999Societedes Procedeset Machines SpecialesMachine for machining internal surfaces of axisymmetric workpieces using an abrasive strip
US7371158 *Aug 7, 2006May 13, 2008Work Co., Ltd.Plating removing apparatus for two-piece wheel
EP0188982A1 *Dec 19, 1985Jul 30, 1986Societe De Rectification Cylindrique Francaise S.R.C.F.Machine tool spindle with a variable inclination
WO2002024406A1 *Sep 20, 2001Mar 28, 2002Siipo RaimoDevice for conditioning inner surface of chemical tank by grinding
Classifications
U.S. Classification451/304, 451/307
International ClassificationB24B5/00, B24B5/40, B24B21/00, B24B21/02
Cooperative ClassificationB24B5/40, B24B21/02
European ClassificationB24B5/40, B24B21/02