US3389653A - Spindle press - Google Patents

Description

H. HANY SPINDLE PRESS June 25, 1968 Sheets-Sheet 1 Filed Oct. 4, 1966 HARALD HANY INVENTOR.

H. HANY SPINDLE PRESS 5 Sheets-Sheet 2 HARALD H/Vy I N VEN TOR.

B ,I (B OS ew* g' Attorney June 25, 1968 Filed oct. 4. 196e June 25, 1968 H, HANY 3,389,653

SPINDLE PRESS Filed OC. 4, 1966 5 SheetS-Sheet 3 will O) 0) Illu (D HARALD H/M/Y INVENTOR.

BY s* United States Patent Oce 3,389,653 SPINDLE PRESS Harald' Hany, Kassel-Wilhelmsliohe, Germany, assignor to Firma Franz Berrenberg, Haan, Rhineland, Germany, a corporation of Germany Filed Oct. 4, 1966, Ser. No. 584,269 Claims priority, application Germany, Oct. 16, 1965,

7 claims. (ci. 10o- 214) ABSTRACT F THE DISCLOSURE A spindle press in which a ram has upstanding front and rear wings which bracket a cross-piece of the frame and have vertical edges in sliding contact with that crosspiece; these wings have a height greater than a vertical yram stroke to straddle the cross-piece in Itop and bottom positions of the spindle, the frame having a pair of uprights with the cross-piece attached to their upper ends. The uprights and cross-piece have aligned front and rear shoulders constituting vertical guideways for the ram.

My present invention relates to a spindle press of the general type described, for example, in commonly assigned application Ser. No. 550,208, tiled May 16, 1966, by Volker Stille and me.

In such press a spindle is mounted, generally vertically, in a frame which threadedly engages, usually through the intermediary of a stationary nut, so as Ito move up and down upon being reversibly rotated, the lower end of the spindle carrying a ram to be brought into contact with a, workpiece carried on the press frame. In order to impart such reversible rotation to the spindle, the latter is rigid with a driven disk which is frictionally engageable by either one of two driving disks flanking the spindle. The driving disks can thus be jointly and continuously rotated by an appropriate power source, such as an electric motor, so that a large torque is instantly available for transmission -to the driven disk as soon as the latter makes contact with one of the driving disks; as the spindle descends, the driven disk engages the cooperating driving disk along an ever-increasing radius so as to be progressively accelerated during the working stroke of the ram.

If a press of this description is to produce a large output, the motion of the spindle must be reversed at a rapid rate. Such rapid reversals, however, are possible only if the spindle and its ram Atogether have a low inertia, this in turn calling for a ram of limited height. On the other hand, it is necessary that the ram be accurately guided on the press frame, such guidance being diliicult to achieve with rams of short axial length.

My presen-t invention, accordingly, has for its object the provision of an improved ram construction which affords accurate guidance while allowing a substantial reduction in the overall dimensions and, therefore, the weight of vthe ram as compared with conventional presses of this type.

The above object is realized, pursuant to my present invention, by the provision of a ram having upstanding front and rear wings which bracket a cross-piece of the frame and have vertical edges in sliding contact with that cross-piece, these wings advantageously having a height greater than a vertical ram stroke so as to straddle the cross-piece in both a top and a bot-tom position of the spindle.

`In a preferred embodiment, pursuant to a further feature of my invention, the frame comprises a pair of uprights having the cross-piece xed to their upper ends, the uprights and the cross-piece being formed with align-ed front and rear shoulders which constitute vertical guide- 3,339,653 Patented June 25, 1958' ways for the ram. Advantageously, these guideways accommodate respective guide -rails for the ram which span both the uprights and the cross-piece so as to avoid any discontinuity along the ram stroke.

The above and other features of my invention will become more fully apparent from the following detailed description, reference being made to the accompanying drawing in which:

FIG. 1 is a front-elevational view of a spindle press embodying the invention;

FIG. 2 is a cross-sectional view, drawn to a larger scale, on the line II-II of FIG. 1;

IFIG. 3 is a sectional elevational view taken on the line -III-II\I of FIG. l;

FIG. 4 is a cross-sectional view drawn to substantially the same scale as FIG. 2 and taken on`the line IVAIV of FIG. 1; and

FIG. 5 is a side-elevational view of a ram forming part of the press shown in FIGS. 1-4.

The press shown in the drawing comprises a frame with a pair of uprights 1 bridged by -a cross-piece 2. Lodged centrally in this cross-piece is a iixed nut 4 threadedly receiving a vertical spindle `5 whose lower end is rigid with a ring `9 held axially between a pair of thrust bearings 7 and I10. The bearings are seated in a ram 6, upper bearing 7 being locked in position by a collar 8 which is fastened to the ram by screws 8'. Tie rods =3 extend y vertically within the uprights y1 and have heads 3 bearing upon the cross-piece 2, `their lower `ends 'being secured by nuts 61 to a base 60 forming par-t of the press frame.

The ram 6 is of generally cup-shaped configuration and has a bottom 14 of limited thickness integral with a pair of upstanding front .and rear wings 115. These wings bracket confronting cylindrical outer surfaces 2' of the cross-piece 2, centered on the axis of spindle 5r, and are in sliding contact with both the cross-piece 2 and the uprights 1. This sliding contact takes place through the intermediary of a set of rails L22 of triangular profile, resting against `aligned ront and rear shoulders 20, 20a of the cross-piece and the uprights, and vertical bars 23 of square prole which are rigid with the ram and are received in V-grooves 17 along the lateral edges of the wings 15. The rails 22 extend over the full stroke length of the ram which is so dimensioned that the wings -15 still straddle the cross-piece 2 in the lowermost spindle position in which the ram bottom 14 is at a level shown in dot-dash lines in FIG. 1. The guide surfaces of these rails, contacted by the bars 23, lie in generally diagonal vertical planes which pass close to the axis of spindle 5. The ram bottom 11i has a central recess 16 for the attachment of tools designed to deform a workpiece resting on the bed 16. Guard strips 2'4 are secured to the crossepiece 2 by screws 24 and overlie the bars 23 which in turn are attached to the ram 6 'by countersunk screws 23' received in threaded bores `27.

The tube of spindle 5 is rigid with a driven disk 11 alternately engageable by a pair of driving disks 29a, 29b on a horizontal shaft '30; the unit 29a, 2%, 30 is journaled in xed bearings `5-1 atop the frame 1, 2 and is axially shiftable for selective frictional contact of disk di with either of disks 29a, 29b. In operation, the unit 29a, 2%, 30 is continuously rotated by a drive motor 513 via a belt 54 on disk 2gb.

As seen most clearly in F'IG. 5, the ram 6 has lateral cutou-ts 28 separating the wings=15 from each other. The wings are formed with large openings 13 which further reduce the weight of the ram and facilitate visual inspection of the spindle |5 at the point of its emergence from nut 4.

Only the rails 22, forming -continuous guideways for the ram, the' bars 23 in contact therewith and the associated guard strips 24 need to consist of highly polished bearing metals; the other surfaces of the ram and the frame do not require special machining.

Transparent window panes 1'3' of lightweight material in openings 13 enable the wings 15 to act as shields which intercept outwardly squirting oil during reciprocation of the ram.

lIt will be apparent that even substantial eccentric stresses exerted upon the ram will tbe absorbed by the slidable mounting described and illustrated so that no wedging or jamming of the reciprocating assembly will occur.

I claim:

1. In a spindle press, in combination, a frame comprising a pair of lateral uprights and a cross-piece bridging said uprights; a vertical spindle lianked by said uprights and threadedly received in said cross-piece for coordinated rotation and vertical motion; drive means supported on sai-d frame for reversibly rotating and thereby alternately lowering and raising said spindle between a top position and a bottom positiont hereof; and a Vertically movable ram mounted on the lower end of said spindle for vertical entrainrnent thereby, said ram being provided with upstanding front and rear wings bracketing said cross-piece and having vertical edges in sliding contact with the latter and with said uprights.

2. The combination deiined in claim 1 wherein said wings have a height greater than the vertical stroke of said ram, thereby straddling said crossapiece in both said top and bottom positions of said spindle.

`3. The combination defined in claim 1 wherein said cross-piece is xed to the uper ends of said uprights, said uprights and said cross-piece being formed with aligned front and rear shoulders constituting vertical guideways for said ram.

4. The combination defined in claim 3, further comprising a set of vertical guide rails for said ram iixedly received in said guideways and spanning the respective uprights and said cross-piece.

5. The combination delined in claim 4 wherein said guide rails have ram-engaging faces lying in generally diagonal vertical planes.

6. The combination de'lined in claim 5, further comprising a set of guard strips carried on Said cross-piece and forming vertical guide channels with said ram-engaging faces of said rails, said ram being provided with front and rear lateral projections respectively received in said channels.

7. The combination defined in claim 6 wherein said projections are formed by vertical bars of substantially square proiile rigid with said ram.

References Cited UNITED STATES PATENTS 2,491,384 12/1949 MacMillin 30S-13 2,523,393 9/1950 Rhodes 10G-214 XR 2,384,160 9/ 1945 Ernst 10D-214 X R 3,044,138 7/1962 Lesnett et al. 10U-289 XP FOREIGN PATENTS 839,572 6/1960 Great Britain.

BILLY I. WILHITE, Primary Examiner.

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