US1148121A - Bar-twisting machine. - Google Patents

Description

S. S. PORTER.

BAR TWISTING MACHINE.

APPLICAUON man Nov.15,1911.

' 1,148,121. Patented July 27, 1915.

2 SHEETS-SHEET l.

S. S. PORTER.

BAR TWISTING MACHINE.

APPLICATION FILED Nov. 15. 19u.

1,148,1 2.1, Patented July 27, 1915.

2 SHEETS-SHEET 2.

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S'IAIESk PATENT OFFICE. Y

SIDNEY S. PORTER, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO CALUIVIET STEEL COMPANY, OF CHICAGO HEIGHTS, ILLINOIS, A CORPORATION OF ILLINOIS.

BAR-TWISTING MACHINE.

Specification of Letters Patent.

Patented July 27, 1915.

i y.Application filed November 15, 1911. Serial No. 660,397.

To all whom t may concern Be it known that I, SIDNEY S. PORTER, a citizen of the United States, residing in Chcago Heights, in the county of Cook and State of Illinois, have invented anew and useful Improvement inBar-Twisting Machines, of which the following is a specification.

This invention relates to bar twisting machines.

`More specifically, the invention relates to machines for twisting bars such as are now used extensively in reinforced concrete structures, and is adapted to operate on either hot or cold bars of rectangular, square or other polygonal cross section.

Heretofore in the manufacture of twisted bars, it has been customary to twist the bars or rods, while cold, in machines having two spaced chucks or gripping heads, the bar having an end secured in each, one chuck being held stationary while the other is rotated, or else both chucks rotated, but in opposite directions. This old method of twist- I ing has many disadvantages for the reason that the machines occupy -a large floor space since it is necessary that the 'chucks be spaced apart a distance equalv to the length of the rod or bar-being operated upon;- only bars of definite length can be twisted; the twist is not uniform, due to the fact that the quality and characteristics of the metal throughout the rod are not uniform, thereby allowing the rod to twist to a greater extent in the ksoft portionsthan in the hard portions, and furthermore the ends of the rods held in the chucks are not twisted and the lengths of these untwisted portions amount to several inches at each end.

The object of my invention is to provide a structure which will overcome all these defects, and one which will be adapted to operate on various sized bars non-circular in cross section and of any'length, either hot or cold, and one that will twist the rod its entire length and provide the same with a permanent superficial twist or deformed surface, and consists'essentially of a stationary member or die, and by the term stationary .in this connection, I mean non-rotatable7 about'the aXis of the bar being operated upon, the rod or bar being adapted to pass through this stationary member or die, which serves to hold the rod or bar' from rotation; a rotary head or chuck through which the rod is adapted to pass, and having kmeans thereon to grip the rod or bar and thus twist it at the same time that the rod or bar is allowed to pass through it continuously.

Different means may be employed for feeding the bar, and the same may be fed direct from the rollingmill when hot bars are being treated, or feeding rolls of any ordinary type may be used when cold bars are being treated. On the rotatable head or chuck are mounted preferably positively driven rolls, the number of said rolls varying according to the number of sides on the rod being twisted. In the case of a flat bar or rod, I prefer to use only two of such rolls, but inthe drawing, I have shown my device as provided with four rolls and adapted to operate on a square rod. These rolls are skewed relatively to each other and to the line of travel of the barbeing twisted,

andthe chuck or head plate which carries the rolls is preferably keyed to a hollow shaft suitably mounted in a frame and through which the vtwisted bar is adapted to pass, Iand jwh-ich is rotated at a compara-- tively high speed by any suitable mechanism, such, for instance, as an electric motor. Each of the rolls is ymounted on a shaft preferably inclined to the face ofthe chuck plate, and is rotated by interposed connections from a stationary gear. These rolls are equally spaced around the chuck, and their edges or operating faces are placed so that at their nearest points they Contact the central portions of the sides of the rod, gripping the same suiiiciently to twist it, and at the same time allowing the rod to pass therebetween with a minimum amount of friction, since the surface speed of the rolls is regulated to approximately the surface speed of the rod as itis fed forward to avoid slipping. r VAnother important feature of my invention consists in the fact that the rolls, being mounted ina skewed relation to each other, and rotating at a comparatively high rate of speed vwith the chuck or head, form a sort of bell-mouth or conical opening having the apex thereof at the portions where the rod is gripped bythe rolls,v so that asthe forward end of the rod comes from the stationary member or die, `it will be engaged by the rolls forming the revolving conical bellmouth, and the end will be properly guided icol until engaged and gripped by the rolls when the rod is immediately begun to be twisted. My machine may be adapted vto operate on different sized bars, by changing the distances between the rolls, which may be accomplished in various ways, either by adjusting the rolls on the rotating chuck plate, or by interchanging the chuck plates or heads as entireties, and by changing the speed of rotation of the chuck the pitch of the twist may be varied at will.

My invention furthermore consists in the novel parts and devices and in the novel combinations of parts and devices herein shown and described or claimed.

In the drawings, wherein is illustrated one form of my invention, and in which like figures denote similar parts throughout, Figure 1 is a plan view of my improved mechanism. Fig. 2 is a side elevation of the same, parts of the framework being broken away to more clearly show the details of construction. Fig. 3 is an end elevation of the rotating chuck or plate having the rolls mounted thereon. Fig. i is a longitudinal vertical section, taken substantially on the line 4.-4 of Fig. 3, and looking in the direction of the arrows. Fig. 5 is a detail, sectional view taken substantially on the line 55 of Fig. 3 and looking in the direction of the arrows and Fig. 6 is a section of the stationary die, taken on the line (5-6 of Fig. 4.-, looking in the direction of the arrows.

In the drawings, 10-10 denotes any suitable base or frame, preferably composed of two parallel I-beams 11, having removably attached thereto cross pieces 12, said cross pieces 12 being secured as by means of bolts 13. Mounted on these cross pieces 12 are the bearings 14C foi` a hollow, rotatable shaft 15, said shaft 15 extending longitudinally of the framework. The shaft 15 which carries the rolls about to be described, is removably and interchangeably mounted in said bearings 1a, whereby the machine is adapted to operate on bars of different sizes by substituting shafts having chucks thereon with the rollers mounted to operate on different sized rods. Also mounted on the base or fra'ne 10 is an electric motor 115, the armature shaft of which has a gear 16 keyed thereon, said gear 16 meshing with a gear 17 .keyed to the shaft 15. Other forms of mechanism may be substituted for those which I have shown for driving the shaft 15, without departing from the spirit of my invention. Mo uuted on the front or forward end of the hollow shaft 15 and keyed thereto is a chuck or head plate 1GO having a plurality of bearings 170 therein in which are adapted to rotate a plurality of shafts 18. Also mounted on the chuck plate 160, and preferably removably secured thereto, as by means of bolts 19, are wedge shaped bearing members 20y in each of which is mounted to rotate a shaft 21, having at its inner end and keyed thereto a roll 22, said roll preferably 'having its circumference or edge tapered, as more clearly shown in Fig. 5. Keyed to the outer end of each of the shafts 21 is a gear 23, eachof said gears 23 meshing with a worm 24 mounted on the forward end of a shaft 18. On the rear end of each of the shafts 18 and keyed thereto is preferably a bevel gear 25, meshing with a stationary bevel gear 2G, said bevel gear 26 being rigidly connected by any suitable means to a portion of the frame 10 and preferably to the front cross piece 12 thereof. From the structure described, it will be apparent that as the chuck plate 160 rotates, carrying therewith bodily the plurality of rolls 22, each of the latter will be positivelyl rotated by means of a shaft 21, gear 23, worm 24, shaft 18 and gear 25 meshing with the stationary gear 26. The surface speed of the rolls 22 is preferably made to equal the surface speed of the bar 27, being operated upon by the rolls, and the gearing is preferably arranged so that three revolutions of the chuck plate 160 cause one revolution of the shaft 21.

Disposed in alinement with the hollow shaft 15 and preferably four inches from the operating portions of kthe rolls 22 is a stationary member or die 28 secured to any suitable frame member as shown, said die having therein a recess 29 corresponding in shape and size to the bar 27 being operated upon, and through which the bar 27 is adapted to easily pass, but which will be prevented from rotation at those portions held within the die 28. Mounted adjacent the stationary bar holding member 28 are rolls 30 which may be either those of a rolling mill where hot bars are being treated, or which may be of any ordinary structure adapted to feed cold bars. As shown more clearly in Fig. 3, the operating portions of the rolls 22 are so spaced that they contact the central portions of the flat sides of the bars being operated upon, and it will be apparent that the number of rolls is adapted to be varied, according to the number of faces on the bars or rods being treated. As shown in dotted lines in Fig. 3, the portions of the rolls adjacent the points where the rolls engage the bar form a bell-mouth of conical shape, having the outer portion thereof corresponding to the outer dotted circle 31 and converging to the points where the rolls contact the bar and grip the same and twist it, thereby providing means for guiding the forward end of the bar as it is fed from the die 28. It will be apparent that as soon as the forward end of the bar has been gripped by the rolls 22, it will immediately begin to be twisted, owing to the fact that the rolls, which are mounted on the chuck 160, are rotating, thereby rotating the free end of the bar, while the other portions of the bar are held from twisting in the die 28. By varying the speed of rotation of the chuck plate 160, it will also be apparent that the pitch of the twist in the bars may be varied. Furthermore, it will be seen thatthe bar will be twisted completely to its rear end, inasmuch as portions of the bar will be twisted by the rotating` rollers so long asthere is any part of the bar 27 held within the die 28, and in this way I provide a structure which is adapted to operate upon bars of any length while the same are being continuously fed to the machine, and one which will form a twist throughout the entire length of the bar. It will also be noted that the hollow shaft l5 which I have provided is of considerable length, and the object of this is to prevent whipping of thebar as it is continuously fed through the machine and twisted.

The machine described provides a superficial permanent twist in the rod or bar being operated upon; that is, a twist or irregular configuration in the surface of the rod or bar, so that in usein connection with concrete a firm and strong union between the rod and the concrete mixture may be obtained.

Many changes may be made in the details of my invention without departing from the spirit thereof, and all such changes are contemplated as fairly come within the scope of the appended claims.

I claim 1. In a bar twisting machine, the combination with a non rotatable die through which the bar is adapted to pass, of a chuck plate mounted on a hollow, rotatable shaft, skewed rolls mounted on said chuck plate, ancll means for rotating the chuck and the rol s.

f2. In a machine of the class described, the combination with a non rotatable member through which a rod orV bar is adapted to pass, of a hollow, rotatable shaft in alinement with said member, a chuck plate keyed to said shaft, a plurality of rolls mounted on said plate, said rolls being skewed relatively to each other and to the line of travel of the bar, each of said rolls `being mounted on a shaft having a gear thereon, intermediate shafts geared to each of the roll shafts,

`combination with a non rotatable and a stationary gear for rotating the intermediate shafts. A

3. In a twisting machine for operating on bars or rods of polygonal cross section, ghe

ie through which a bar is adapted to pass and corresponding in size and shape to the polygonal cross section of the bar, of bar feeding means, a hollow, rotatable shaft in alinement with said die, a chuck plate keyed to said shaft and rotatable therewith, a plurality of skewed rolls mounted on said plate, a stationary gear and means for rotating each of said rolls from said stationary gear.

4. In a twisting machine for operating on bars or rods of polygonal cross section, the combination with a non rotatable member through which the bar is adapted to pass, of a rotatable member positioned adjacent thereto having means thereon adapted to grip the bar and rotate the same and allow the bar to pass therethrough and form a permanent twist in the bar, a long, hollow shaft on which said rotatable member is mounted and through which the bar is adapted to pass, said hollow shaft serving to prevent whipping of the bar as it is fed and twisted, substantially as specified.

5. In a rod or bar twisting machine, the combination with bar feeding rolls, of a stationary die through which the bar is adapted to pass, a rotatable chuck plate having mounted thereon skewed rolls adapted to grip and rotate the bar as it is fed from the die and thereby twist the bar, said rolls being so arranged that portions of them while being rotated with the chuck plate from a bell-mouth adjacent the die whereby the forward end of the bar is automatically guided to the gripping portions of said rolls.

6. In a rod or bar twisting machine, the combination with a suitable frame, of a non rotatable bar holding member through which the bar is adapted to pass, an interchangeable, rotatable chuck plate having means thereon adapted to grip the bar and through which the bar is adapted to pass, said chuck plate being removably mounted on the frame whereby the machine may be adapted to operate on bars of various sizes.

SIDNEY S. PORTER.

Witnesses: y

LEE H. Hook, FRANK N. PRIME.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

. Washington, D. C.

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