US3380284A

US3380284A - Deforming device for elongated elements

Info

Publication number: US3380284A
Application number: US523402A
Authority: US
Inventors: Brener Heinz
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-01-28
Filing date: 1966-01-27
Publication date: 1968-04-30
Anticipated expiration: 1985-04-30
Also published as: AT264991B; GB1130536A; DE1502920B2; CH449388A; DE1502920A1

Description

H. BREUER April 30, 1968 DEFORMING DEVICE FOR ELONGATED ELEMENTS Filed Jan. 27, 1966 INVENTOR.

Attorney Heinz Breuer States My present invention relates to stamping devices and the like of the type generally employed for the bending of elongated metallic members and, more particularly, to a stamping press in which eccentric means drives a bending die or other tool against a workpiece supported by an anvil.

Devices of this general character have been proposed heretofore for the bending of wire, bands, strips and profiled elongated metallic members into any desired configuration, such devices having a tool or die shiftable in a support structure and adapted to press the elongated member against a fixed die or anvil with a force derived from a cam, crankshaft, eccentric or the like; for the most part, the anvil die is fixed with respect to the support structure or is movable therein in the direction of displacement of the ram die and can be provided with recesses or protuberances complementary to or cooperating with projections or recesses of the ram die or other tool part to impart to the metallic band, wire, or profiled bar the desired configuration. The eccentric was, in turn, driven by a source of motive power, e.g. an electric motor, and in some arrangements was a cam whose carn follower was coupled with the ram. The finished workpiece was then ejected from the device concurrently with or synchronosuly upon the Withdrawal stroke of the ram and its tool or die. An important application of machines of this character has been in the field of band or wire bending for the production of industrial or commercial frames, hangers, wire furniture, stands and the like and substantially any configuration or profile of a bent elongated element can be attained or used. Thus, wires or rods of circular, elliptical, triangular and rectangular cross-section have been employed and the bends have been made in the plane of the face of the wire or transversely thereto. Other suitable elongated members include metal strips and bands of varying widths.

For the most part, however, the prior-art devices of this nature were characterized by an undue stress upon the bearing structures of the drive shafts or axles of the eccentric or cam during the pressure stroke. When the object to be deformed was of relatively inflexible material or was to be bent through a relatively small radius or deformed over a large area, the resistance to the stroke of the ram was such as to apply considerable strain in one direction to the bearing structures of the eccentric or cam. During the withdrawal or retraction stroke, however, no corresponding stress is developed so that the bearing system tends to wear prematurely and requires much care and frequent replacement.

it is, therefore, the principal object of the present invention to provide an improved deforming device having a shiftable ram and anvil structure, especially suitable for wire or rod bending, which is capable of avoiding the disadvantages mentioned above and is characterized by a long useful life, minimum danger of breakdown and high force efficiency.

A further object of this invention is to provide a deforming device of the character described which permits of ready replacement or adjustment of the deforming ice dies or tool parts, is capable of precise operation and is readily adjustable for most purposes.

According to a general feature of this invention, an improved deformation press comprises a support frame or structure having an anvil member provided with a counter tool part or die and a ram member shiftable toward the anvil member in the support structure; the present improvement resides in part in the provision of an axle in the support structure for a pair of forcetransmitting levers forming a scissor-type linkage. The levers are independently coupled with the ram which is constituted as a slide guided in the support structure viapivotal links. These levers are, in turn, provided with respective connecting rods mounted upon a crankshaft such that the levers are rotated or pivoted about their common axle in opposite senses and the force moment associated with each of these levers is effective at least during the working stroke of the ram in opposite senses with respect to the axis of the crankshaft whereby no resultant radial vector force can be considered as effective at this axis. Thus, the force moments at the eccentric or crankshaft are only torque moments tending to rotate or resist rotation of the crankshaft and no unidirectional strain upon the bearing system is produced.

According to a more specific feature of this invention, the axle or pivot common to the levers is itself eccentrically mounted in the support structure to permit shifting of the pivoting axis toward or away from the stationary die. Thus the stroke of the ram or its limiting positions can be modified in response to wear of the tool parts or dies or the replacement of such die. Advantageously, the link means assigned to the respective levers are disposed on opposite sides of a plane through the axis of pivoting movement thereof and extending in the direction of movement of the slide or ram. Furthermore, the slide and support structures are provided with mating dovetail formation in the direction of movement of the slide for positive positioning thereof while the tool parts or dies and the slide or anvil are provided with corresponding and mating dovetail formations allowing adjustment of the tool parts in the plane of the slide movement but perpendicular thereto.

The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying drawing in which:

FIG. 1 is a lateral elevational view, partly broken away, of a stamping device for the deformation of elongated elements in accordance with the present invention;

FIG. 2 is a view taken along the line Il-I1 of FIG. 1; and

FIG. 3 is a cross-sectional view taken along the line Iii-III of FIG. 2.

In the drawing, I show a support structure which constitutes a press frame consisting of a pair of front and

back plates

2, 3, held together *by a block 20 and bolts 21 at the top of the press and by an anvil member 23 and bolts 22 at the base of the press. The

plates

2, 3 thus sandwich between them the ram means 4 which is constituted as an elongated vertically, shiftable slid body; the latter has dovetail recesses 6a, 6a, extending in the vertical direction and receiving the

dovetails

6b, 6b which are affixed to the

plates

2, 3 by bolts 6'. Thus, the

mating formations

6a, 6b and 6a, 6b, by means of which the slide 4 is guided upon the

plates

2 and 3, prevent lateral movement of the slide 4 as well as torsional motions and any other effects tending to dislocate the slide 4. As will be apparent from FIGS. 1 and 2, the slide 4 is provided with a further dovetail means 7 whereby a tool part 5' of the bending press can be affixed to the slide. The dovetail formation 7 includes the dovetail recess 7a of the slide which extends longitudinally (arrow 25 in FIG. 2) in the body of the slide 4 and receives the dovetail 7b affixed to the tool part 5 whose bending protuberance is shown at 5a- The complementary tool part 5", which is afiixed to, but slidable along the anvil 23 via a further dovetail arrangement 7, has projections 5a" which co-operate with the projections 5a upon downward movement of the slide 4 to bend any elongated element inserted into the press. Clamping bodies d and 8" lock the tool parts 5', 5" in place in their

respective dovetail guides

7, 7" and have

screws

8a and 8a" for this purpose.

At the upper side of slide 4, I provide lugs 4', 4" by means of which

link pairs

9, 9" are pivotally secured via pins 9a, 9a" to the slide. These

double links

9, 9" are pivotally connected, in turn, by pins 912 and 9b" to a rearward portion of a lever 11 and a forward projection 1d of a lever 10. The levers 1t), 11 are individually swingable about an axle formed by the pivot shaft 15 which is eccentrically mounted between the plates as shown at 15 so that, upon rotation of the shaft 15, the common pivoting axis of the

levers

10 and 11 can be shifted toward and away from the anvil 23 to permit adjustment of the limiting position of the stroke of the slide 4 to compensate for wear of the tool parts 5' and 5". The shaft is formed as a bolt whose head 15" is seated against the plate 2. and which can be tightened by a nut 16 to lock the selected position of the shaft.

The

levers

11 and 11, at locations remote from the pivot shaft 15, are individually articulated to respective connecting

rods

12 and 13 which, in turn, are swingably mounted upon respective portions 12' and 13' of a crankshaft generally designated 14 and driven by a motor or the like in the usual manner. The eccentric portions 12, 13' of the crankshaft 14 are angularly offset from one another so that, upon rotation of the crankshaft about its axis A, the connecting

rods

12 and 13 move oppositely upwardly and downwardly to impart swinging movements to the levers 1t} and 11 in the opposite senses. Thus, when rotation of lever 10 is effected in the clockwise sense, the lever 11 is swung counterclockwise and the slide 4 driven downwardly. This corresponds to the deformation stroke of the press, and the considerable reaction force applied to the crankshaft 14 is balanced by forces in opposite directions so that only a torque strain is observed in the crankshaft 14 and substantially no unbalanced radial force is applied to the crankshaft bearings.

The entire apparatus is highly compact, permits ready adjustment of the tool parts for the deformation of wires,

bands and the like which require bending at locations offset from the center of the press, and is free from wear at locations involving differences with prior systems.

It will be understood that the invention as described and illustrated will admit of modifications readily apparent to those skilled in the art and encompassed within the spirit and scope of the appended claims.

I claim:

1. A device for the deformation of elongated elements, comprising a support structure; anvil means on said support structure; ram means slidably mounted on said support structure for movement toward and away from said anvil means, said ram means and said anvil means being provided with respective cooperating tool parts adapted to impart to said elements a desired configuration upon engagement of said elements between said tool parts as said ram means is shifted toward said anvil means; a pair of levers pivotally mounted on said support structure and individually swingable thereon; respective link means pivotally connecting each of said levers with said ram means for shifting same toward and away from said anvil means; crankshaft means rotatable for displacing said ram means; and respective connecting rods pivotally connecting said levers with said crankshaft means for individual movement of said levers thereof to shift said ram means.

2. A device as defined in claim 1, further comprising a common pivotal shaft for said levers forming a common pivotal axis therefor extending perpendicularly to the direction of movement of said ram means.

3. A device as defined in claim 2, further comprising means for mounting said pivotal shaft eccentrically in said support structure for selective movement of said axis toward and away from said anvil means, thereby permitting adjustment of said ram means upon wear of said tool parts.

4. A device as defined in claim 2 wherein said link means each include a pair of links pivotally connected to the respective levers with said pairs of links being disposed on opposite sides of said axis, said links lying substantially in respective planes perpendicular to said axis and parallel to the direction of movement of said ram means, said links each being pivotally connected with said ram means.

5. A device as defined in claim 4 wherein said crankshaft means has at least two angularly offset eccentric portions each connected with a respective one of said connecting rods and dimensioned such that the connecting rods move in opposite directions and said levers pivot in opposite senses upon rotation of said crankshaft means.

6. A device as defined in claim 4 wherein said support structure includes a pair of plates extending generally in planes parallel to the direction of displacement of said ram means, said ram means constituting a slider received between said plates, at least one of said plates and said slider being provided with relatively displaceable matingly interconnecting dovetail formations guiding said slider on said support structure.

7. A device as defined in claim 4 wherein at least one of said ram and anvil means and the respective tool part are provided with relatively slidable matingly co-operating dovetail formations permitting sliding movement of the respective tool part in a direction transverse to said axis, said device further comprising clamping means for locking the slidable tool part in any desired operative position thereof in its path of movement.

8. A device as defined in claim 9 wherein both said anvil and ram means are elongated bodies extending transversely to said axis and are provided with longitudinally extending dovetail formations connecting the respective tool part therewith, said tool parts each being provided with respective clamping means enabling the fixing of the tool parts over the entire length of said bodies.

9. A device as defined in claim 6 wherein said levers extend generally parallel to one another outwardly of said support structure in a direction generally perpendicular to said axis, one of said levers having a projection pivotally connected to the respective pair of links beyond said pivotal shaft, the other pair of links being connected with the other of said levers rearwardly of said pivotal shaft with respect to the direction of extension of said projection, each of said plates having a dovetail formation slidably guiding said ram means.

References Cited UNITED STATES PATENTS 411,480 9/1889 Warren 72-450 2,113,161 4/1938 Osborne 72-450 3,003,540 10/1961 Robinson 72450 FOREIGN PATENTS 836,888 4/ 1952 Germany.

CHARLES W. LANHAM, Primary Examiner.