US1816377A - Machine for bending and tempering leaf-springs - Google Patents

Description

July 28, 1931, P. l- IOBRACHT' MACHINE FOR BENDING AND TEMPERING LEAF SPRINGS Fi led Dec. 12, 1928 s sheets-sheet 1 m m m July 28, 1931. ,P. HOBRACHT 5 3 MACHINE FOR BENDING AND TEMPERING LEAF SPRING6 Filed Dec. 12, 1928 s Sheets- -Shaet 2 IN V EN TOR.

P. HOBRACVT ,3 MACHINE FOR BENDING AND TEMPERING\LEAF sPRINs July 28, 1931.

Filed Dec.- 12, 1928 5 Sheets-Shae; 3

INVENTOR.

Patented July 28, 1931 UNITED STATES PATENT OFFICE PAUL HOBRACHT, or DUSSELDORF, GERMANY MACHINE FOR BENDI'NG' AND TEMPERING LEASE-SPRINGS Application filed December 12, 1928 Serial No. 325,452, and in Germany December 14, 1927.

Object of the invention is a machine for bending and tempering leaf-springs and such like, which renders possible an automatic and continuous working- In accordy'lfance with the invention any desired number of separate treatment devices may be disposed along the periphery of a drum. The pre-heatedworkpieces are placed into the separate treatment devices where they are bent andconsecutively passed through a plunger-bath, being thereby simultaneous- 'ly tempered and subsequently automatically ejected and conveyed;

The accompanying drawings illustrate v the new device, in which Fig. 1 represents a front-view, partly in section, of the apparatus. Fig. 2 is a side-view of bending-device in section.

Fig. 3 is a sectional end elevation of a pair of adjustable jaws and a support for the saw blade.

Fig. 4 is a sectional side elevation of the parts shown in Fig. 3. j v

Fig. 5 is a top plan view of the same.

Fig. 6 is a View of the hydraulic actuating mechanism.

Upon a drum 1 and rotatably supported by standards 10 a plurality of bending-devices for leaf-springs, eight for instance, are equally distributed about the periphery of the drum. The bending-device consists of two pressure-jaws, a fixed one 3 and a movthe same with the able one 4:. The pressure-jaws support" pressure-bars 5, 6, between which the leafsprings are bent. The pressure-bars 5, 6 (see Figs. 3-5) are interchangeable and separately adjustable with the aid of a screw 7 and a wedge "8 which can be displaced along a groove 9 on the wedge-shaped rear of each pressure-bar 5, for the purpose of being able to adjust them in accordance with the desired degree of flexure. support each leaf-spring 2 in its middle-p0- sition upon the pressure-bars,-a special supporting device has been provided. This consists of plates 15 fitted with arms 11 on either side which are guided along eccentric grooves 12 in two rings 14 adjustable by her-tubing ,20- and outlet-pipes '21. valve device for instance, consists of a cas- In order to means of a lever 13. I The plates 15 are always occupy the middle-position opposite the pressure-bars 5. The supporting-rails 17 are made narrow, in order to permit the tempering medium, such as oil etc. to reach all points of the leaf-spring. For the purpose of enabling the spring-leaves to de scribe small longitudinal movements in conjunction with differences in tension,-the ends of the pressure-bars are provided with rollers which are supported by ball-bearings 37.

The actuation of the moveable pressurejaw 4 with the pressure-bars 6 for the purpose of bending the spring-leaf 2 placed in position is effected hydraulically by means of pairs of pressure-pistons 18, placed within 'cylinder's19- on the pressure-jaw 4,-con nected with the frame or with the pressurejaw 3. The pressure-cylinders 19 belonging together are each connected with a valve device by means of feeding-pipes or. rub- The ing 22 carrying the piping establish-ing connection with the hollow shaft 24, and containing within an axially adjustable piston valve connected with bars25, 26 projecting from the drum on either side. The

latter act conjointly with cam members 27, 28, causing the guide-pistons to be displaced .to the left or to the right, whereby the pressure-cylinders 19 are either. placed under pressure or relieved of pressure.

Every bending device has, moreover, been provided with an ejecting-device for the completed work-pieces, which is made to consist of adjustable hook-arms 30 carried by a rock shaft-x29 and which catch rakelikein between the pressure-bars5, 6. The

'hook-arms are retained in their position by means of springs 31 and, on turning the drum 1 the bar 25 is made to alongthe cam surface 27, thus causing the valve 22 adjusted to supply fluidpressure to actuate jaw 4 and the spring-leaf 2 is bent. The.

latter is then by rotation of the apparatus plunged into the oil bath in the tempering tankiin which theapparatus is arranged and tempered-"as theoperation is continued As soon as each bending-device has reached the point B after the drum has described a turn, the'jaw 4 will beopened again in consequence of the bar26 being moved by cam surface 28 and thecompleted spring will be released and ejected by the hook-arms 30.

1. In a machine for bending and tempering leaf-springs, the combination, wvith a rotatable carrier shaft or drum,iof relatively :fixed and -movable pressure jaws disposed parallel tosaid shaft or drum, pressure'bars carried by said jaws and variably operable for bending and clamping a leaf-spring, means for engagement with an edge of the spring, centrally of the latter for supporting said spring against displacement while permitting it to have free flexingmovements for adjustments to accommodate itself to the adjustments of the jaws, means for adjusting said supporting means relatively to the jaws, and means operative in the rotation'of the shaft or drum for adjusting the jaws and clamping bars fora bending and clamping action and subsequentlyretracting the same. a

2. In a machine for bending and tempering leaf-springs, the combination, with a rotatable carrier shaft or drum, of relatively fixed and adjustable pressure jaws disposed parallel with the axis of the drum and movable in a'direction circumferentially of the drum toward and from each other, pressure bars carried by said jaws for bending: and clamping a spring, means for-effecting individual adjustments of the pressure bars of onejaw at'least with respect to the pressure bars of theother jaws, a support movable radially of the drum and toward and from the jaws for engaging anedge of a spring blade and loosely supporting the same between the jaws to prevent "displacement of the spring while permitting adjusting movements'thereof in the adj u'stmentof the jaws, means-for adjusting said radially adjustabl'e support, and means operative in the roing individualadjustments of the pressure barsof at least one of the jaws with respect to the pressure bars of the other jaws, a support lmovableradially; of the drum and toward and from the-,jawsfor engaging an edge of a spring blade centrally thereof and loosely supporting the same between the jaws to prevent displacement of said spring while permitting: it to adjust itself in the (adjustments of the jaws, disks carried by the drum and having cam grooves, said grooves being engageable with said support for adjusting the latter, a lever for adjusting said disks, and meansoperative in the rotation of thedrum for moving, said aws and bars into bending and clamplng position and subsequentlyretracting-the same.

4, In a machine for bending and tem-r peringleaf-springs, the combination, with a rotatable carrier drum or shaft, of relatively fixed and adjustable pressure 'jaws'carried by said shaft, vrows of pressure bars carried by the jaws,the bars of at least ofv the rows-being individuallyadjustable with relation to the other bars, means em"- bodying fluid pressure-cylinders and pistons for respectively relatively adjusting said jaws and bars in differentdirections, and mean for successively admlttmg fluid pressure to the respective cylinders for actuating the-pistons at different points in the orbit ofrotationof the shaft or drum.

,5. In a machine for bending and tempering leaf-springs, the combination, with a rotatable shaft or drum, of spring bending and clamping devices carried by the drum and movable toward and from each other, fluid pressure means embodying a pair of cylindersand pistons for respectively projecting and retracting said devices, and valve mechanism 'shiftable in the rotation of the shaft or drum for successively admitting fluid pressure to anddischarging fluid pressure from-the respective cylinders.

6[ In a machine for=bending and temperpering leaf-springs, the combination, with a rotatable carrier shaft or drum, of bending and clamping devices carried by the shaft or drum and movabletoward and from each other, fluid pressure means embodying a pair of cylinders and pistons for respectively adjusting said devices toward and fromzeach other;"a valvedevice for admitting fluid pressure to and discha'r ingfiuid pressure from the respective cylin ers, cams on the machine frame, and means connected with the valve and shifted in opposite directions by said cams for shifting the valve .in opposite directions at different points in the orbit of revolution of the shaft or drum.

7. In a machine for bending and tempering leaf-springs, a rotary carrier shaft or drum, relatively movable jaws, sets of pressure bars on said jaws, the bars ofone of the sets at least being individually adjust able for variably bending and clamping a spring edgewise radially to said shaft or drum, asupporting member engageable with an edge of the spring centrally thereof to support it while so bent and held, means for automatically moving said devices into and out of bending and clamping positions at points in the rotation of the drum or shaft, and means operative at a point in the rotation of the drum or shaft for removing the treated spring.

8. In a machine for bending and tempering leaf-springs, a rotary shaft or drum, relatively movablebending and clamping devices carried by and movable with said shaft or drum, means for adjusting the same toward and from one another at different points in the rotation of the drum, means for supporting a spring leaf bent and clamped between said devices, hook-shaped ejectors engageable with the spring'leaf for engaging and removing the same after treatvment, and means for actuating said hook-

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