US1856299A - Scaling device - Google Patents

Description

y 3, 1932- J. c VAN ALPHEN ET AL 1,856,299

SCALING DEVICE Filed Feb. 5, 1931 N V5 IV TOPS Johan/res Come/l3 MM/Mel; P/fer fer Hank and Theodor Lec/ze/f.

Patented May 3, 1932 UNITED STATES PATENT OFFICE JOHANNES CORNELIS VAN ALPHEN, PIETER TIER HAAK, AND THEODOR LECHELT, OF AMSTERDAM, NETHERLANDS SCALING DEVICE Application filed February 5, 1931, Serial No. 513,556, and in the Netherlands October 16, 1930.

The invention relates to automatic scaling devices for the scaling of iron, which .is covered with rust, thick coats of paint and the like, for the working of concrete or for chipping oil the scale of boilerplates and so on.

Scaling devices are known in which two or more tools are mounted on a shatt. By rotating this shait at a high speed an automatic scaling device is obtained. The lixing or mounting oi. the tools on the shaft, however laced with serious obstacles. The lirni securing of the tools which are liable to loosen during the use of the scallng device. not onl leads to com )licated iixinc' l n U a way that they are immovably mounted on the holder causes, apart from the loosening of the tools by vibration, vibration of the automatic scaling device with respect to the material to be worked. This repulsive action makes the handling of the scaling device very heavy and tiresome. With the automatic scaling device according to the invention these ditliculties are surmounted.

The automatic scaling device according to the invention comprises toolholder provided with axially directed chambers, in which the ends of the tool, similar in form to the chambers, are axially arranged alternately with intermediate discs. Said ends, movable in a circumferential direction, are secured by means of a screwed plug placed on the toolholder. Thus each tool is separately supported in the toolholder. The invention further comprises the provision in the body of the toolholder of two or more axially directed channels of cylindrical form which are situated equidistantly from the axis of the tool-holder and which are in communication with the outside circumference of the tooiimioer by means of narrow slots, which are smaller than the diameter of the ends of the tools.

One end of the body of the toolholder is provided with a supporting-head which is formed as a whole with it, whereas the other end is provided with a screw-thread on which a plug is screwed. A. drivingspindle for the toolholder is connected to this plug.

An embodiment of the automatic scaling device according to the invention is illustrat-ed in the accompanying drawings:

Fig. 1 shows the automatic scaling device, partly in elevation, partly in section.

Fig. .3 is a view of the scaling device in another position.

Fig. 3 is an elevation of the device seen from the driving side of the holder.

Fig. 4; is a cross-section of the toolholder over one set of tools.

The body 1 of the toolholder, in the form indicated in Fig. a, is provided with a supporting-head 2. The axially directed, concentrically situated chambers 3 are similar in term to the ends 4 of the tools 5. The chambers 8, in the form of cylindrical channels situated equidistantly from the axis of the toolholdcr, are in communication with the outside circumference of the toolholder by means 01 narrow slots, which aresmaller than the diameter oi? the ends of the tools. The d of the body of the toolholder opposite to the supporting head is provided with a screw thread, on which a plug 6 can be screwed. The driving spindle of the automatic scaling device is connected to this plug 6. The tools 5, consisting of toothed chisels, are inserted :lrom the plug side of the toolholder into the channels 2-). The ends of the handles of these tools are similar in form to the cylindrical channels or chan'ibers 3. Intermediate discs are placed alternately with the tools into the toolholder. In this manner the tools are situated in the holder with the desired dis tance between them. These pieces are secured in the holder by means of the screwed plug 6 in such a way that the tools 5 are movable in the holder.

The narrow slots, with which the cylindrival channels are in communication with the outside circumference of the toolholder, are

each wider than the part of the tool which lies in the slot.

Consequently the tool can place itself under a fixed angle with regard to that diameter of the holder which is directed through the centre of the handle end. This angle, which is indicated in Fig. 4, actually determines the cutting-angle of the tool. In action, the tool will place itself against the shoulder of the slot of the cylindrical channel 3. In the illustrated example three channels 3 are made in the toolholder 1. In accordance with the character of the material to be worked and the velocity of rotation of the automatic scaling device more channels or chambers 3 provided with the respective tools can be used. The tools themselves are also selected in accordance with the material to be worked. The intermediate discs 7 are very carefully chosen in number and thickness in order-to fix accurately the mutual distance of the tools in accordance with the material to be worked.

In consequence of the simple construction of this automatic scaling device an easy exchange of the tools is made possible. Moreover it is impossible for the tools to loosen by vibration, as they are secured in a radial sense, being movable in the direction of the circumference of the automatic scaling device and also, if desired, axially with orwithout the aid of springs. By this arrangement an easy pressing of the device against the material to be worked is obtained, so that the handling of the apparatus takes place without trouble. 7

As the working area of the automatic scaling device can be brought easily in accordance with the totalsurface to be worked, this scalon which av plug is screwed, a driving spindle for the toolholder being connected to this plug.

In testimony whereofiwe afiix our signatures.

JOHANNES CORNELIS van ALPHEN. PIETER ler HAAK. THEODOR LECHELT.

ing device is specially suitable for working the hulls of ships, which are covered with rust or thick coats of paint. also for removing the skin dueto rolling of new ironwork.

The advantage of this automatic scaling device is also prominent in finishing and working concrete.

In the event of a fracture only one or more of the tools break, specially by the parts which lie in front of the slots; the body of the toolholder, however, 'remains'in working order, as the pressure exercised on the tools is uniformly divided over the entire body of the toolholder. A large security of service is thus 7 obtained.

cured in the toolholder.

2. A scaling device as claimed in .claim 1, wherein the body of the toolholder is provided with two or more axially directed chan-

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