US1688159A

US1688159A - Drawing ring for wire-drawing machines

Info

Publication number: US1688159A
Application number: US245835A
Authority: US
Inventors: Darmstadt Peter; Stegmann Wilhelm; Weil Valentin
Original assignee: FIRM DRAHTINDUSTRIE PETER DARM
Current assignee: FIRM DRAHTINDUSTRIE PETER DARM; Firm Drahtindustrie Peter Darmstadt & Co G M B H
Priority date: 1927-09-22
Filing date: 1928-01-11
Publication date: 1928-10-16
Anticipated expiration: 1945-10-16

Description

Oct. 16, 1928.

Filed Jan. 11, 1928 ATTa/Pn/ Patented Oct. 16, 1928.

UNITED STATES PATENT OFFICE.

PETER DARMSTADT, WILHELM STEGMANN, AND VALENTIN WEIIJ, FECHENHEIM,

NEAR FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNORS TO THE FIR-M DRAHT- INDUSTRIE PETER DARMSTADT A6v CO., G. M. B. H., OF FRANKFORT-ON-THEMAIN,

GERMANY.

Application mea January 11, 192s, serial No.

It is well known to provide the rotating drawing rolls or rollers of wire drawing machines with separate drawing rings loosely vfitted thereon which feed the wire by reason of the friction between the ring and the drawing roll or roller, and are adapted to compensate for the lengthening which o ccurs durv drawing rings hitherto used for this purpose were of comparatively large cross section and were rigid. Consequently the' friction between the ring and the drawing roll or roller was too low'and attempts were made to increase this by lubricating the'contact surfaces* witha suitable adhesive (lubricant of great*v toughness). This method fulfills its purpose when the speed of drawing` is not too high, but has not been found very satisfactory. .In consequence of the increase indrawing speed which it .has been attempted to obtainoin recent times, particularly for the purpose of `greater economy, the drawing'members are considerably heated, that is to say the rotary drawing rolls or rollers and the loosely fitted drawing ring, so that the lubricant is rendered fluid to such` an Iextent that it is yno longervpossible forthedrawing rings to op erate properly at high drawing speeds. v

According to the invention thereare used for the purpose of increasingthe friction Ibetween the drawing rings and the drawing rolls or rollers, elastic drawing rings, that is to say thecross section of these rings is so 40 dimensioned that during the drawing operation they are capable of being'deformed under the action of the .pulling tension of the wire and consequently the surface with which they bear against the drawing rolls or rollers .45 is increased.

In the accompanying drawing are illus- DRAWING RING FOR WIRE-DRAWING MACHINES.

245,835, and in Germany September 22, 1927.

In order that the invention may be readily l understood the proportions have been-exaggerated in the drawing. v

The drawing ring c, according to the invention, is made deformable and elast-ic, and` in the normal or unstrained :condition (Figure l) bears only with a small contact'.

surface on its drawing roll or roller b. As soon, however, as it comes under the action of the variable pulling tension of the wire to be drawn, it is deformed and the contact or bearing surface becomes larger in proportion to the increase of the pulling tension of the wire (Figure2) and Aconsequently the frici tion between the drawing ring and the drawing roll or roller is proportionatelyincreased. By means of the new elastic drawing rings, whilst avoiding any separate adhesive lubrieating means, the object of the frictional drive and the feeding of the wire is effected in a simple and very effective manner whilst constantly vcompensating for increases in length, even at high drawing speeds.

On the periphery the rings may be provided with one or more ribs serving as guide tracks or paths for ythe wirepassed over them.

At high drawing speeds they also preventthe undesirable cuttlng action of the wire as also` the breakage thereof which frequently occurs with the constructions used hitherto.

We wish it to be understood that the illustrationsin the drawings are diagrammatic only land thatvarious refinements may be made within the scope ofthe appended claim. A continuous ring has been shown freely fitted upon a driving roll. By continuous ring we mean a ring that has no gaps or open cross-cut spaces in its periphery, and during the drawing operation-to vary the by freely fitted We refer only to a ring Whose area of the bearing surface between the ring rotation about the drum is unlimited. and the roller in accordance with Variations We claim: in the tension of the wire. 6 In combination. with a drawing roller of In witness whereof we have hereunto set l5 a Wire-drawing machine, an elastic continuour hands.` t ous ring fitted freelyon such roller, said ring being adapted to Contact with the Wire along PETER DARMSTADT. only a ortion of its periphery, the ring thus W'ILHELM STEGMANN. 10 being eformable by the tension of the wire VALENTIN WEIL.