US2257546A

US2257546A - Self-propelled machine for handling forgings

Info

Publication number: US2257546A
Application number: US240764A
Authority: US
Inventors: Dienenthal Herbert; Zimmermann Theo
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-11-19
Filing date: 1938-11-16
Publication date: 1941-09-30
Anticipated expiration: 1958-09-30
Also published as: FR845256A; GB511734A; DE700524C

Description

Sept. 30, 1941. H. DIENENTHAL ET AL SELF-PROPELLED MACHINE FOR HANDLING FORGINGS Filed Nov. 16, 1938 2 Sheets-Sheet l p 1941- H. DIENENTHAL ETAL 2,257,546

SELF-PROPELLED MACHINE FOR HANDLING FORGINGS Filed Nov. 16, 1938 2 Sheets-Sheet 2 Patented Sept. 30, 194i FORGINGS Herbert Dienenthal and Theo Zimmermann, Siegen, Westphalia, Germany Application November 16, 1938', Serial No. 240,764 r In Germany November 18, 1937 6 Claims},

Self-propelling machines for holding and turning heavy work to be forged are known in which a device which carries the tongs for holding the work comprises a number of parts which are able, to make angular movements relatively one to another, and pressure or tension springs, which are fitted between these parts take up the additional load which occurs during forging. However, when a machine of this kind is actually used, it has been found that the device which carries the tongs behaves as if it were almost entirely rigid since the springs are too short to act as effective buffers. advantage is that in the known machine the carrier for the tongs is supported by-twolifting cylinders which act independently. It is then impossible to prevent the movements of 'the lifting cylinders differing somewhat from one another, the result of whichis that the carrier does not maintain a horizontal position as is desired when forging. a

Now the object of the present invention is to provide an'apparatusof the kind described in which the aforesaid disadvantages are" ob-- viated. According to the invention the carrier for the tongs is resiliently suspended from four points on a linkage whichis actuated by-a single lifting cylinder. In one preferred form of construction-a pair of bell-crank levers is pivoted at each, side to the "frame of the machine, and the levers of each pair are linked together by a bar connected to the end of one arm of each of the levers while tothe ends of the other armsof the four levers are pivoted four upright rods whichcarry long helical springs on which the carrier for the tongs is supported. These springs take up the weight of the carrier which is distributed uniformly over the four points of suspension and they are able to support and hold the carrier securely in the horizontal position in which it is-alwaysset bymeans of the lifting cylinder which acts on the-linkage. Under the additional load which occurs during forging the springs yield uniformly as 'a whole in a vertical direction, that is to say in the direction in which the additional load acts.

Further, in accordance also: with the invention,-

A further dismotor 4.

this position. The carrier is therefore able to makelongitudinal movements and can yieldunder the load which occurs owing to extension during forging while the vertical supporting springs can swing about the pivots on which the rods which support them are mounted. The

carrier therefore always maintains its horizontal position.

A constructional embodiment of a machine in accordance with the invention is illustrated by in which Figure 1 is a side elevation of the machine,

Figure 2 shows the central portion of the machine with the carrier for the tongs displaced,

Figure 3 shows three sections on the lines AB and CD of Figure 2 respectively,

Figure 4 is a broken-off the 1ine AA of Figure 5, and

Figure 5 is a broken-off horizontal section on line 3-3 of Figure 4.

Referring tothe drawings, the frame I of the self-propelled machine is supported on wheels 2, 3, of which the steering wheel 2 isldriven by a The driving gear of the vehicle has two separate controls. For fast running for carrying and conveying the billets to be forged, the motor is controlled by means. of a controlling drum. When forging, on the other hand, the machine can be intermittently moved for- Wards or backwards by foot-actuated pedals in accordance with the feed necessary during forging.

On pivots 5 and 6 at each longitudinal side of theframe vl are pivotally mounted bell-crank levers 1, 8 which are connected transversely in pairs by pivot bars 9, l0 respectively, and longitudinally in pairs by rods II. A lifting cylinder l2 in the centre of the machine acts on the pivot bar I 0. The lifting cylinder (Figures 4 and 5) is supported through trunnion pins c by. brackets d carried by a transverse plate e which is secured at each end to frame I. Piston ,f carries piston rod a which is securedto pivot bar II). On each side of the piston, the cylinder is in communication through pipes g, h and suitable valves with a source of fluid under pressure, whereby the ,piston may be reciprocated to rock bell-crank levers 8 and, through rods H, levers 1. The cylinder rocks in response to changes in elevation of bar Ill. The other ends of the levers carry, on pivots l3, [4, long vertical bolts l5 and I6 around which are disposed helical springs I1 and IS on which 7 supporting

arms

19, 20 for the member 2| which vertical section on" at each side of the machine. The helical springs act, through the agency of the bushes 30, 3|,

uniformly on both sides of the machine against moving heavy work to be forged, comprising a wheeled frame, means for propelling the frame, a tongs for holding the work, a pair of bell-crank levers pivotally mounted at either side of said frame, a bar pivoted to one arm of each lever of each pair of said levers, upright rods pivoted to the other arms of said levers, helical springs disposed around said rods, members supported on and partly enclosing said springs and slidable on said rods, pivots on said members, a tongs-carrying member, arms on said tongs-carrying member mounted on said the eyes 21 and 28 of the carrier and therefore tend to hold the carrier in the central position; The actual tongs 33 for holding the work to be forged are revolubly mounted the carrier 2|- on a rigid holder 35. It may be opened in known pivots and a single lifting cylinder by which said bell-crank levers can be turned about their pivots.

4. A self-propelled machine for holding and moving heavy work to be forged, comprising a wheeled frame, means for propelling the frame,

manner from the drivers seat 36 and, can be.

rection, that is to say in the direction in which the additional load is exerted. Horizontal displacements are taken upby the springs 32, one or other of the sleeves 30 and 3| being shifted on the bolt 29, as shown in Figure 2.- The rods l5 and I6, together with the springs l1, l8 thereby swing about the pivots l3 and I4 so that the horizontal position of the carrier and the parts associated with itis maintained.

The machine may run without rails or; may be constructed as a rail vehicle.

We claim:

1. A self-propelled machine for holding and moving heavy Work to be forged, comprising a Wheeled frame, means for propelling the frame, a tongsfor holding the Work, apair, of "belle crank levers pivotally mounted at either side of said frame, aibar pivotedjto one arm ofgeach' lever of each pair of said levers, upright rods pivoted to the other arms .of said levers, helical springs disposed around said rods, a tongs-care rying member supported by said helical springs, and a single lifting cylinder by which said bellcrank levers can be turned about their pivots 2. A self-propelled, machine forholding and moving heavy work to be forged, comprising a wheeled frame, means for propelling the frame, a tongs for holding the work, apair of bell crank levers pivotally mounted at either side of said frame, a bar pivoted to one arm of each lever of each pair of said levers, upright rods pivoted to the. other arms of said levers,- helical; springs disposed around said rods, members sup-.

ported on said springs and slidable on said. rods, pivots on said members, a tongs-carrying member, arms. on said tongs-carrying member mounted on said pivots, and a single lifting:

cylinder by which said bell-crank levers canbe turned about their pivots.

.3. A self-propelled machine for. holding' a nd a tongs for holding the work, a pair of bellcrank levers pivotally mounted at either side of said frame, a bar pivoted to one arm of each lever of each pair of said levers, upright rods pivoted to the other arms of said levers, helical springs disposed around said rods, a tongs-carrying member supported by said helical springs, a buffer frame connected to one arm of each lever of each pair of said levers, resilient means whereby said buffer frame is normally held ina central position and a single lifting cylinder by which said bell-crank levers can be turned about their pivots.

5. A self-propelled machine for holding and moving heavy work to be forged, comprising a wheeled frame, means for propelling the frame,

a tongs for holding the work, a pair of bellcrank leverspivotally mounted at either side of said frame, a bar-pivoted to one arm of each lever of each pair of levers, upright rods pivoted to the other arms of said levers, helical springs disposed around said rodsya tongs-carrying member supported by said helical springs, a buffer frame connected to one arm of each lever of each pair of said 'levers,helical springs parallel to the axis of the tongs-carrying member whereby saidbufier frame is held in a central position and a single lifting cylinder by which said bell-crank levers can be turned about their pivots. 1

6. A self-propelled machine for holding and movingheavy work to beforged, comprising a wheeled frame, means for propelling the frame, a tongs for holding the work, a pair of bellcrank levers pivotally mounted at either side of said frame, a bar pivoted to one arm of'each lever of each pair of said levers, upright rods pivoted to the other arms of said levers helical springs disposed around said rods, a tongs-care rying member supported by said helical springs,

a buffer frame connected to one arm ofv each;

lever of each pair of said levers, apertured lugs on said bufferframe, apertured lugsj on, said tongs-carrying member, a rod fixedinthe apertures in said last-mentioned lugs and slida ble in the apertures in the first-mentioned lugs, sleeves on said rod slidable in said first-mentioned apertures, collars on said sleeves, a, springbearing against said collars and a single lifting cylinder by which said bell-cranklevers-can be turned 1 abouttheir pivots. i

I .=.I-IERBERT DIENENTHAL. THEO ZIMMERMANN.