US1585212A - Bending press - Google Patents

Description

May 18 1926. 1,585,212

F. G. scHRANz BENDING PRES S Filed March 6, 1924 2 Sheets-Sheet l May 18 1926.

F. cs. scHRANz Patented May 18, 1926.

UNITED STATES PATENT- OFFICE.

FEEDERICK GEORGE SCI-IRANZ, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SOUTI-IWARK FOUNDRY & MACHINE COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

BENDING PRESS.

AppIication filed March 6, 1924. Serial No. 697,399.

My invention is directed more particularly to that form of bending press in which the cooperating dies, or die and anvil, are :mounted horizontally; one die, which may constitute the anvil, occupying a fixed or substantially fixed position, and the other or shaping die being arranged for movement relatively to the same; in the present instance upwardly on the working stroke.

My present invention comprises a construction in which the anvil die is carried by a cross-head, which may be supported by a pair of columns at one end of the press and held in horizontal position against deflection which might be occasioned by the pressure of the shaping die when brought into contact with work to be operated upon by said dies, by links hinged to the base of the press; such links being suitably connected together at the top and operatively engaging the cross-head, and for this purpose they may be apertured to receive a cross-pin which may be arranged to overlie the end of said cross-head.

The pivotally mounted links may be swung away from their engagement with the cross-head to permit cylindrical work to be placed in operative position and removed, when corrugating boiler sections for instance, and for the removal of other kinds of work, and the operation of these links is under the conrol of a suitable piston mounted in a cylinder which may be arranged to swing on trunnions with respect to the press frame so as to be capable of eecting move? ment of said links in both directions.

These and other features of my invention are more fully described hereinafter; reference being had to the accompanying drawings, in which:

Figure 1, is a front elevation, partly in section, of a bending press embodying the features of my invention.

Fig. 2, is a plan view of the same.

Fig. 3, is an end elevation looking the direction of the arrow :0, Fig. 1.

Fig. 4 is a sectional elevation of the cylinder and piston employed for operating the pivoted links, and

Fig. 5, is a diagrammatic view illustrating the dies in operative position with respect to a sheet formed into a substantially rectan guiar shell.

In the drawings, l represents the base of my improved bending press, which may have a pair of cylinders 2, each provided with a ram 3, suitably placed with respect to said cylinders; said rams beingattached to a bed plate 4, to which the lower die or shaping member 5, is detachably connected. This die or shaping member 5 is of a removable character in order that changes in dimension or form for different work operations may be made as desired, ,and the bed plate 4 may be grooved at 4a to receive ribs 5a carried by dies or shaping members of the general type indicated at 5.

At one end of the base section, a pair of columns 6 are supported in any suitable manner, and a crosshead 7 is secured to the upper ends of these columns; the base of the press and said cross-head each being provided 'with outwardly projecting brackets, lndicated at 8 and 9, respectively, with a tension or tie bolt 10` connecting said brackets whereby the cross-head may be held in a substantially horizontal and fixed position. The columns may be provided with stop collars or nuts 11, adjustable thereon, to determine the height at which said cross-head is supported, and the bolt 10 may be threaded to an extent to permit the desired adjustment, or bolts of diiferent length may be employed. The cross-head 7 may carry a detachable anvil or die member of the type indicated at 12, which may have a rib 12a, adapted to a groove 7a, in said -cross-head.

Disposed at the end of the press opposite the columns for the purpose of holding the cross-head 7 against deflection when pressure is applied upon movement of the lower die or shaping member 5 with respect to the anvil or upper die 12 connected to said cross-head, are a pair of links 15, having a pivotal mounting comprising a pin 16, to which they are secured; such pin passing through the apertured end of a stem 17, which may be mounted in an apertured boss 18, carried by the base of the press and held in position by a collar or nut 19, at the lower end of the same. This stem is acl-- justable so that if changes are made in the position of the cross-head with respect to the bed plate by raising or lowering the cross-head on the columns 6, corresponding change can be made in the position of the links for proper engagement with said cross-head.

The links normally occupy the operative position shown by full lines in Figs. l, 2 and 3, and they may be provided at t-heir upper ends with a cross-pin 20, overlying the projecting end Zh oit the cross-head 7. The links are held against lateral displacement with respect to the cross-head when in operative position by means ont a suitable pin 2l, passing through the end 7b of the cross-head.

The links are movable upon their pivotal connection 16 to the position shown by dotted lines when it is desired to introduce cylindrical work into the press or to remove other types of work operated upon, and such movement may be e'lrected by providing the pivot pin 1G, which is fixed to the links, with a forked crank 25, to which is connected a piston rod 26, having a piston 27, adapted to a cylinder 28; the latter being provided with trunnions 29, whereby it may swing in brackets 30, carried at the end ot the press base. Such cylinder is connected with a suitable source of pressure by a pipe 3l for the introduction et fluid to raise the piston and move the links into the position shown in Fig. l, and 'tor the exhaust of such fluid to lower the piston when it is desired to lower the links to the position indicated by dotted lines. A suitable stop 32 may be provided upon which said links may rest when in the lowered position. The cylinder 2A is preferably set to one side at the end ot the base, so that the links may be raised and lowered without interference with their operating means.

n practice, a'lter suitable dies or shaping members have been secured in place in the anvil and the movable bed plate, the work to be acted upon, a metal sheet for instance, is introduced between the same, and pressure being supplied to the cylinders 2, the rams 3 will be lifted and with them the bed plate and lower die which will crowd the work into the upper die, imparting to the plate the desired configuration. In Fig. 5, l have illustrated the bending ot a sheet to form a square tank or shell, indicated at A, lt a cylindrical object is to be operated upon, the retaining pin 2l is removed and the links are lowered to the position shown by dotted lines by proper direction of pressure to the cylinder 28, or by their own weight when the cylinder is open to ei;- haust, and after the work to be operated upon has been put in place, the links will be returned to operative position by admitting pressure to the cylinder 28 to raise the piston 27, and operation of the structure may proceed as in connection with ordinary tlat work; the links being lowered when cylindrical work or work such as illustrated in Fig. 5, is to be removed.

As will be understood, pressure may be admitted to the cylinders 2 to move the rams 3 upward, and exhausted from said cylinders to permit downward movement et the same, via a pipe 35, having separate connections 235 and 35h, leading to the respective cylinders; said pipe o5 being connected to a suitable source of l'luid pressure.

l claim:

l. In a bending press, the combination of a base, a cylinder disposed therein, a ram adapted to said cylinder, a horizontally disposed inovable bed plate connected to said ram, vertically disposed columns at one end oi the press for guiding said bed plate, a horizontal cross-head carried by the upper ends oi said columns, means for normally holding said cross-head in horizontal position, a link pivotally connected to the base opposite said columns with its upper end in operative engagement with said crossliead whereby the latter is held against detlection when the work is brought into contact therewith by the movable bed plate, and fluid-operated means for raising and lowering said link into and out of operative engegement with the cross-head.

2. ln a bending press,the combination oitI a base, a cylinder disposed therein, a ram adapted to said cylinder, a horizontally disposed movable bed plate connected to said4 ram. columns at one end of the press for guiding' said bed plate, a horizontal crosshead carried by the upper ends of said columns; said cross-head having aligned end extensions, means connected to one of said extensions ior maintaining the cross-head in horizontal position, links pivotally connected to the base opposite said columns, a cross-pin carried by said links and overlying the opposite end extension ot said cross-head whereby the latter is held against deflection when the work is brought intol Contact therewith by the movable bed plate, and means for raising and lowering said links.

3. ln a bending' press, the combination of a base, a cylinder disposedl therein, a ram adapted to said cylinder, a horizontally disposed movable bed plate connected to said ram, a die member det-achably secured to said bed plate, columns at one end of the press :t'or guiding said bed plate, a horizontal cross-head carried by the upper ends of said columns; said cross-head having aligned end extensions an anvil or die member detachably connected to said cross-head for cooperation wit-h the die member carried by the bed plate; the latter having aligned end extensions underlying those of the crosshead; outwardly projecting brackets carried by the base and cross-head, a tension bar connected to the end extensions of the cross-head and base at one end ot the structure, links pivotally connected to the base extension opposite said columns and in operative engagement with the extension of said cross-head whereby the latter is held against deflection when the work is brought into contact therewith by the movable bed plate, and means for raising and lowering said links.

4. In a bending press, the combination of a horizontally disposed base, a cylinder disposed therein, a ram adapted to said cylinder, a vertically movable bed plate connected to said ram, a die member detachably secured to said bed plate, columns at one end of the press for guiding said bed plate, a cross-head carried by the upper ends of said columns, an anvil or die member detachably connected to said cross-head for cooperation with the die member carried by the die plate, aligned extensions projecting from the base and cross-head, a tension bar disposed between and connecting the base and cross-head extensions at one end of the structure7 links pivotally connected to the base extension opposite said columns, a cross-pin carried by said links and overlying the end extension of said cross-head whereby the latter is held against deection link in fixed relation therewith, a cylinder v operatively connected to the aligned eXtension of the base, a piston in said cylinder connected to said crank arm, and means for directing pressure to said cylinder to raise and lower said link.

6. In a structure such as set forth in claim l, a crank arm connected to the pivot pin for the link, a swinging cylinder carried by the end extension of the press base, a piston in said cylinderI connected to said crank arm, and means for directing pressure to said cylinder whereby the piston may be operated to raise and lower said link.

In witness whereof I have signed this specification.

F. G. scHRANz. l

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