US1315964A - Hugo jawtsch - Google Patents

Description

H. JANscH.

MOTTLING TOOL. APPLICATION FILED Dsc. 1B. 191s.

. with precision and HUGO JANTSCI-I, 0F DETROIT, MICHIGAN,

Specification of Letters Patent.'

Application filed December 18, 1918. Serial No. 267,411.

To (LZZ whom 'it may concern:

Be it known that I, HUGO JAN'rsoH7 a former subject of the former Emperor of Austria, and former resident of Bohemia, now residing at Detroit, county of lVayne,

State of Michigan, have invented a new and useful Improvement in MottlingTools, of which the following is a specification.

This invention relates to a machine for mottling or lapping metal surfaces, especially for mottling steel surfaces, used in machine construction. This work has heretofore been done largely, if not entirely, by hand manipulation of a tool. It is the object of the present invention to provide a machine which is adapted to do this work what might he said almost automatically. The hand is used only to move the tool across the work, While the operation and guiding of the tool is accomplished by parts of the machine itself.

In the drawings,"

Figure l is a plan view of the tool. i

Fig. 2 is a cross section on the line 2-2 of Fig. l.

Fig. 8 is a fragmentarv side elevation of the tool taken at 'the left of Fig. 1.

Fig. 4 is a section on the line 41.--4 of Fig. Q.

Fig. 5 is an end elevation of the carriage.

In machine tool construction it is quite customary to give some of the surface a wavy appearance, which is often called mottling. This has been almost universally accomplished heretofore bv manipulation of a hand tool, that is to say, a tool was run across the surface by hand and given the necessary rocking or to and fro twisting motion to producethis effect. Lapping of metal with emery spread on the surface and a copper tool has also been performed in this same way. It is the object of this invention to accomplish this mottling or lapping by eliminating this manipulation.

a is a track comprising simply a bar with a cam in the form of scallops b. This is connected with a bar c which performs much the same service as a bar of a T-square, namely, to engage one of theedges of the surface operated upon to hold the track at a predetermined angle with respect to such edge. This angle may be varied at will by loosening and again tisrhtenino` the screw (Z. However, the angle ordinarilv used would be that of about 45 degrees so as to cause the tool to operate on an oblique line across I the work. The track is undercut at each side underneath, as shown at c, e, to provide rabbets for the tongues 7 of the carriage g. The carriage is made up of a Z-bar 7L (Eig. 5). to which is bolted a pair of blocks e' and y', the latter serving as a journal for the rock shaft 7n. To one end of this is bolted the mottling or lapping tool m. Near the mid portion of this rock shaft an arm n is clamped on by the screw o. This arm has Patented Sept. 16, 1919..

on its under side a ball bearing p which runs over the scalloped race o. The spiral spring g bears against the top of the arm and tends to keep the arm against the scalloped cam. This spring is housed in a small hollow stud r screwed into the top of the Z-bar h and its pressure is adjustable with the nut s."

The carriage is moved forward over the track by the handle t, which is pivoted to the top of the Z-bar 7L. The handle will stop in the angular' relation shown in Fig. 1 when a pushing effort is exerted against the carriage for it then encounters a stop in the form of the head of a bolt u. When the handle is grasped to pull the carriage toward the operator it moves the handle back into the line of draft, thereby causing the cam finger w to run in under the finger ai on the end of the arm a. This holds the ball 7i out of contact with the cam on the return stroke.

It will be evident that a pushing movement away from the operator eXerted upon the carriage will cause the ball p to travel over the scalloped cam, thereby exerting a rocking' movement as well as a forward movement of the mottling or lapping tool m. This will cause a scraping of the surface which will be relatively uniform due to the uniformity of the action controlled by the cam. The operation is a very easy and a quick one, the track serving not only as a guide to cause the tool to travel in a straight line but also serving to impart the rocking movement when the tool is pushed over the guide. lhen the carriage is pulled back the ha udle automaticallv causes the cam follower to rise out of the scallops of the cam so that no rocking movement is imparted to the tool on the return.

What I claim is:

1. A machine for the purpose specified, comprising a track, a carriage, a tool mounted on the carriage to rock in `planes angularly related to the line of travel of the carriage, and means for automatically rockn NVA ing the tool as the carriage is moved vover the track.

2. A machine for `the purpose specilied, having, in combination, a track provided with a cam surface, a carriage guided on thettra'ck, a-wtool journaled to rock in said carriage in planes angularly related to the line of travel of the carriage, and means between the tooland the cam for giving the tool a rocking movement as the carriage is moved over the track.

3. A machine for the purpose specified, having. in combination, a track provided at one side with a scalloped cam, a carriage .designed to ride on the track, a tool mounted inthe carriage to rock in planes angularly related to theline of travel of the tool asf it rides-with the carriage, and an arm secured' to the tool and adapted to ride over the scalloped cam to give the tool a rocking movement as the carriage is moved along the track.

4. A machine 4for the-purpose specilied, having in combination, a track, a cam hav- -inga scalloped surface, a carriage designed to travel onthe track, a tool supported on the carriage to rock in planes angularly related tofits line yof travel, an arm secured to the tool and having-a ball bearing adapted toride on the scalloped cam, and a spring `it'or holding the 'arm kand the ball bearing against the cam.

f 5. A -machinelfor the .having in combination, a track, a cam survface therealong, a carriage adapted to ride on the track, a tool mounted on the carriageI to rock inplanes angularly related to itsvline of travel, an` arm secured to the .purpose specilied,

VJtool and adapted to ride over the cam surface, anda movable handle adapted on the return movement oi the carriage to hold the farm out of engagement with the cam.

6. A machine for the purpose specified, having in combination, a track, a cam surface therealong, a" carriage adapted to ride on said track, a tool rockingl)7 supported in the carriage and provided with an arm hav ing an extending finger, and a handle :secured pivotally to the carriage and provided with a cam finger which upon the movement f ing and guiding a tool that is reciprocated over a plane surface, a scalloped cam as sociated with said support, and a carriage bearing a scraping tool reciprocatable over said support, the said scalloped cam coincidentally causing the tool to rock in planes angularly related to its line ot Vtravel in reciprocating the same along` the said support.

In witness whereof' l' have hereunto set -my hand on the 18th day o't' December,

HUGO JANTSCH.

"Copies bfthiapatentmaj be 4obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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