US901251A - Screw-down mechanism for rolling-mills. - Google Patents

Description

Patented Oct. 13,1908.

E. J. MOILVRIED. SCREW DOWN MECHANISM FOR ROLLING MILLS. APPLICATION FILED AUG. 8, 1907.

WITNESSES E. J. MOILVRIED. SCREW DOWN MEGHANISM FOB ROLLING MILLS. APPLICATION nun AUG. a, 1907.

E. I. MoILVRIED. SCREW DOWN MECHANISM FOR ROLLING MILLS.

APPLICATION FILED AUG.8, 1907. 9O 1 ,25 1 Patented Oct. 13, 1908. 8 SHEBTB-BHEET 3.

INVENTOR a (g h gq W nn Down Mechanism for Rollin -Mills, of

' mechanism. Incidents of this kind may UNITED s'rA'rss PATENT OFFICE.

IIUWI N J. Mel [N [U I51), ()I" ll'lTSBU RU, ll'lN NSYLVAN 1A, ASSIGNOR 'lU UN l'll'll) ENGINEERING dz FOUNDRY COMPANY, 01" I'I'VPSBU'RG, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

Specification of Letters Patent.

l atented Oct. 13, 1908.

Application filed August 8, 1907. Serial No. 887,822.

To all whom it may concern:

Be it known that l, EDWIN J. Mcl nvmnn, of Pittsburg, Alle heny county, PennsyL- vania, have invents a new and useful Screwwhich the followin is a full, c ear, and exact description, re erence being had to the accompan ing drawings, forming part of this speci cation, in which Figure 1 is a front elevation, partly in section, of a portion of a rolling mill embodying one form of my invention; Fig. 2 is a plan view of the same; and Fig. 3 is a side elevation partly broken away.

In the operation of rolling mills, articularly three-high mills, it frequently iappens that there occurs what is termed in rolling mill practice a sticker, that is to say, the thin piece or shape which is being rolled becomes wedged so tightly between two of the rolls as to cause a jam, which locks the holding-down screws to such an extent that they cannot be released by the ordinary releasing cause the destruction of the rolls, or other serious injury to the mill.

The ob ect of my invention is to provide means supplemental to the usual screw-down mechanism which can be quickly broughtinto action when a sticker occurs, to release the jam and permit the rolls to be separated.

In carryin out my invention, the nuts or boxes in which the usual holding-down screws are seated, or have their bearings, are made capable of a vertical movement in the roll housings, and power means are provided for raising the same, together with the holding-down screws, when a sticker occurs, thereby releasing the screws and permitting the usual releasing mechanism to operate thereon.

The precise nature of my invention will be best understood by reference to the accompanying drawings, in which I have shown one embodiment thereof, it being premised, however, that various changes may be made therein by those skilled in the art, without departing from the spirit and scope of my invention, as defined in the appended claims.

In these drawings, the numeral 2 designates the roll housings, 3 the lower roll, 4 the vertically movab e middle roll having suitable actuating mechanism 5, and 6 the upper roll, of a t res-high mill.

7 desi nates the usual holding-down screws, w ich engage the movable boxes or bearings 8, of the upper roll 6. These screws may be actuated in any suitable or usual manner. In the drawings 1 have shown them actuated by means of worm wheels 9, through which the holding-down screws are vertically movable, and which are actuated by worms 10 on a shaft 11. The shaft 11 may be actuated by an electric or other suitable motor 12 through the gearing 13 and 14. The holdin -down screws 7 have a bearing in threaded oxes 16, which are movably seated in the upper portion of the roll housings.v These nuts or bo'xes have each a nut 17 threaded onto their upper ends, and are formed with a lower portion 18 of increased diameter, the upper surface of the shoulder formed by the enlargement being helicoidal and designed to engage a corresponding surface 19 in the roll housing. This surface may be conveniently rovided by inserting and securing a ring within the housing, as shown in Fig. 3, although such surface may be an integral art of the housing. These helicoidal sur aces are in the same direction as the threads on the holdingdowli: screws, but are of considerably greater pitc Fitted upon an angular portion 20 of each of the nuts or boxes is a wrench hub 21 having an extending arm 22. The outer ends of these arms have loose ball and socket engagements 23 with slides 24 mounted on the upper portion of the roll housings in guides 25 so as to move in a'direction parallel to the axis of the rolls. These slides are covered by cap plates 26, one of which is shown )artially broken away in Fi 2. The two s ides 24 are connected -a r or bar 27 to move in unison. The s ides 24 are actuated b' means of a screw-shaft 28, which is arrange to move through a gear wheel 29 which is driven by a motor 30 through the gearing 31. The gear wheel 29 is mounted within the frame in such a manner as to be held against endwise movement, as it is rotated, so that when rotated an endwise movement of the shaft 28 and thereby of the two sleeves 24. is effected.

The (g ration of the invention is as follows: on a sticker occurs and the holding-down screw 7 cannot be operated by the motor 12 owing'to thejamm'ing of the parts, the operator immediately starts the motor 30. This actuates the shaft 28 and moves the two slides 24, thereby turning the wrench arms 22. This causes the rotation of the nuts or boxes 16, and the helicoidal surfaces thereon move on the corresponding surfaces 19, thereby raising the boxes and the holding-down screws therewith. A slight movement of this character will obviously release the holdin -down screws and the motor 12 immediate y commences to operate them. The motor 30 is then reversed to return the boxes to their normal positions.

The advantages of my invention result from the effective manner in which the holding-down screws can be released when the sticker occurs, thereby preventing injury to the rolls and mill.

The improvement can be readily applied to existing mills, and provides an exceedingly simple and effective way of overcomin the difficulties heretofore experienced.

t will be obvious that various means may be provided for moving the nuts or boxes to release the holding-down screws; that various motive devices may be employed for the purpose, and that various other changes mav be made in the details of construction an arrangement.

What I claim is 1. In a rollin mill, the combination of screw-down mec anism for the upper roll, and havin vertically movable boxes ornuts for the ho ding-down screws, a motive device, and connections between the motive device and the nuts for actuating the same and thereby the screws independently of their usual actuating mechanism, substantially as described.

2. In a rolling mill 9. holding-down screw, a box or nut therefor having a threaded bearing in the housing of the mill, a motive device, and connections between the motive device and the nut for rotating the latter on its threaded bearing, sul'istantially as described.

3. In screw-down mechanism for rolling mills, a holding-down screw, and a vertically movable box or nut therefor havin a helicoidal surface thereon, the roll housing in which the box or nut is seated having a bearing surface of complementary form. a motive device, and operatin connections between the motive device an the box or nut for rotating the latter, substantially as described.

4. In screw-down mechanism for rolling mills, a holding-down screw, a vertically movable box or nut therefor having a helicoidal bearing in the roll housin in which it is seated, a wrench arm attac ed to the box or nut, a motive device, and actuatin connections between the motive device an the wrench arm; substantially as described.

5. I11 a rolling mill, a pair of holdingdown screws, nuts or boxes for said screws arranged to have a vertical and rotary movement in the roll housings, wrench arms connected to the boxes or nuts, connected slides engaging said arms, and a motive device for actuating the slides; substantially as described.

6. In a rollin mill, the combination of screw-down mechanism for the upper roll, vertically movable boxes or nuts for the said screws, and means for normally holding the boxes or nuts against movement, and means connected with the boxes or nuts for lifting them when desired; substantially as described.

In testimony whereof, 'I have hereunto set my hand.

EDWIN J. MoILVRIED. \Vitnesses:

H. M. Conwm, LAURENCE H. Lian.

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