US868877A

US868877A - Bevel-polishing machine.

Info

Publication number: US868877A
Application number: US32776306A
Authority: US
Inventors: Heinrich Lohmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-07-25
Filing date: 1906-07-25
Publication date: 1907-10-22
Anticipated expiration: 1924-10-22

Description

No. 868,877- PATENTED OUT. 22'. 1907. H. LOHMANN.

BEVEL POLISHING MACHINE.

APPLICATION FILED JULY 26. 1900.

Min/@3565: 31 9 1' z" i I flu/8117502,: 97?? fiez'nrich 11011112211111 UNITED STATES PATENT OFFICE.

BEVE L-POLISHING MACHINE.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed July 25,1906. Serial No. 327,763.

To all whom it may concern.-

Be it known that l, HEINRICH LOI-IMANN, asubject of the King of Prussia, residing at AiX-la-Cl1apelle, No. 109 Liittichersirasse, in the Kingdom of Prussia, Em piro of German y. have invented certain new and use lul Improvements in Bevel-Polishing Machines and I do hereby declare the iollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

H y present in vention relates to a machine for polishing bevcls and more particularly bevcls of plate-glass, in which the polishing-tools execute one oscillating movement during the same time they execute a series of linear motions, whereby not only considerable time is saved but also the deeper lying cavities in the bevels are provided with just as high a degree of polish as usually only the higher lying parts of the bevcls receive, because such cavities cannot be reached by the head of a polishing-tool which simply moves back and forth on a straight line.

In the accompanying drawing:Figure l. is a side elevation of the new bevelpolishing machine. Fig. 2 is a plan view oi said bevel-polishing machine With certain parts shown in section. 01' the machine with parts shown in section with the driving in cans.

On the table 1 a slide-way 2 is arranged for the slide 3, which is guided by the rib 1 and carries the polishingtools 5. polishing-head 32 and of a vertical spindle 10 to which the polishing-hind is hinged in a manner that the latter can adapt itself freely to any bevel to be polished. The polishing-head is pressed against the bevel by weight 35 carried by said spindle, but can be raised and retained in its elevated position by a hand-operated stoplever as will be more lully explained later on. The slide 3 receives its motion from the eccentric [i seated on the driving shalt 7, which may be either a motorshaft, as indicated, or a lino-shalt, as circumstances may direct. The transmission of the motion of the eccentric (5 to the slide 3 is accomplished by means of the eccentric-rod 8. in the known bevel-polishing machines the polish i ug-tools 5 are simply moved back and forth on a straight line, which arrangement shows this drawback that at places where cavities are ground into the bcvels of the glass-plate 9 such bevels cannot be faultlessly polished. lhis drawback is avoided by the present beve1polishing machine by letting the polishing-tools accomplish a slow oscillating movement during the time they execute a series oi linear motions, which is accomplished in the following manner:To the spindle 10 of ca ch polishing-tool 5 an arm 11 is attached in any suitable manner or made to form an integral part thereof, and the free ends of these arms are held in recesses 'l 2 of the bar 13 which is guided in the Fig. 3 is an end view l lach polishing-tool consists of a leltl'aced forked ends of the posts 14 secured to the slide 3. With one end of this bar is connected the one arm of the bell-crank 15 fulcrumed in the bracket 16 likewise secured to the slide 3. The other arm of the bellcrank 15 is connected with a rod 17 which swings on a pin 18 of the lever 19 fulcrumed to the over-head bracket 20. To the pin 21 arranged on the other side of the lever 19 the rod 22 is pivoted and connected at its lower end with the horizontal arm of the bellcrank 23 pivoted to the bracket 24 arranged sidewise oi the slide 3 on the table 1. The second arm of the bell-crank 23 is attached to the turned-up arm of the double-armed lever 25 pivoted on the pin 26 likewise secured to the table 1. The longer arm of this double-armed lever is attached to the connecting-rod 27 by means of the link 28, which rod receives its motion from the crank-pin 29 of the wheel 30 driven by the pinion 31 of the motor shaft 7.

It is evident that the ratio the slow oscillating movement of the polishing-tools bears to the number of times the linear motions of the polishing-tools are executed during the same unit of time wholly depends on the ratio the pinion 31 bears tothe wheel 30, and

that the angle a described by the oscillating heads 32 of the polishing-tools 5 is given by the linear motion of the bar 13. This arrangement of parts offers, besides the advantages enumerated above, this advantage that the polishing material can be retained between the heads 32 and the bevel without difficulty.

The operation of the machine is follows:At each revolution 01' the driving-shalt 7 the slide 3 will be moved once back and forth, during which motion the rod 17 linked to the bcllcrank 15 will swing once'to and l'ro but as the bar 13 takes part on this motion of the slide 3 it cannot oscillate the polishing-tools 5. Besides this oscillating motion of the rod 17, caused by the motions of the slide 3, it is compelled to execute simultaneously therewith an up and down movement through the instrumentality of the

parts

19, 22, 23, 25 and 27 operated by the wheel 30 and pinion 31. This up and down movement of the rod 17 depends on ratio the wheel and pinion bear one to another and will take place only once during the same time a series of revolutions of the shaft 7 or the same series of back and forth motions of the slide 3 is executed. The up and down movements of the rod 17 cause the swinging motions of the bell-crank 15 and therefore the linear motion of the bar 13, whereby the polishing-tools 5 are slowly oscillated because said bar operates the arms 11. As during these combined motions oi the polishing-tools the latter always shift their position on the bevel, and the heads 32 are hinged to the weighted spindles 10 of the polishing-tools in such a manner that they can easily accommodate themselves to the bevel, a polished bevel is obtained which shows at every point such a degree of high polish as hitherto was only obtainable by the far more expensive skilled hand labor. After the bevel has been polished the longer arms of levers 33 fulcrumed adjacent of the'spindles 10 on top of the tubular guides of the brackets 34 are pushed down in order to lift the weights 35, which carry the spindles 10, and the heads 32 of the polishing tools 5 off the polished bevel. The glass-plate can now be drawn back and shifted to bring another of its bevels beneath the polishing heads 32, or it may be replaced by a new one altogether, as the case may be. After a new bevel has been placed beneath said polishing-heads the levers 33 are manipulated again, but in a reverse Way than formerly, to bring said polishingheads in contact with said bevel, whereupon the polishing operation is commenced anew.

I claim:

1. A bevel-polishing machine comprising polishing-tools capable of executing reciprocating and oscillating motions simultaneously in a true plane, means for causingthe re ciprocating motions of said polishing-tools, and means for oscillating said polishing-tools around their respective cen ters independent of the means causing said reciprocating motions of said polishing tools.

2. A bevel-polishing machine comprising polishing-tools capable of executing linear and oscillating motions simultaneously, a slide supporting said polishing-tools, means for moving said slide back and forth, arms carried by said polishing-tools, a bar slidingly arranged upon said slide and straddling said arms, and means for moving said bar independent of the slide carrying it.

3. In a bevel-polishing machine of the kind described the combination with a table of a slideway, a slide ar ranged on said slide-way, means for imparting linear motion to said slide, brackets on said slide, polishing-tools carried by said brackets, means on said brackets for lifting said polishing-tools off the work-piece, arms on said polishing-tools, forked posts on said slide, a bar slidingly held in the forked ends of said posts and straddling the free ends of said arms, and means for imparting a linear motion to said bar independent of the linear motion of the slide carrying it to oscillate said polishing tools once during the same unit of time they are executing a series of linear motions.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HEINRICH LOUMANN.

Witnesses:

HENRY QUADFLIRG, LILLY KAIll'l.