US883021A - Drawing-press. - Google Patents

Description

No. 883,021. PATBNTED MAR. 24, 1908.

H. J. HINDE.

DRAWING PRESS.

APPLIOATIQN Immun. 19,1901.

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APPLICATION FILED APR.19,1907.

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UNITED STATES PATENT OEEIOE.

HENRY J. I-IINDE, OF TOLEDO, OHIO, ASSIGNOR TO THEuTOLEDO MACHINE & TOOL COMPANY, OF TOLEDO, OHIO.

DRAWING-Pansa Specification of Letters Patent.

Patented' March 24, 1908.

Application filed April 19, 1907. Serial No. 369,175.

T 0 all whom it may concern:

to the following description and to the accom- Be it known that I, HENRY J. HINDE, a panying drawings, in which,-

citizen ofthe United States, and ya resident Figure 1 is a front elevation of the maof Toledo, in the county of Lucas and State chine embodying the features of my invenof Ohio, have invented certain new and useful Improvements in Drawing-Presses; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to drawing or forming presses of the class wherein the blank or sheet to be operated on is first gripped against the rim or margin of thedie by a blank-holder and held firmly in position during the drawing or forming operation of the plunger. A

In this class -of presses the blank-holder and plunger usually have the requisite differential movements communicated thereto from a common crank-shaft through the medium of various arrangements of toggles, levers, cam-mechanism, or the like, thus making it impossible to move either without moving the other of said parts. Numerous objections are incident to this method of communicating motion to the blank-holder and plunger, due principally to the complex nature of the connecting mechanism and to the fact that it is frequently necessary in order to completely form and finish the work, where it is of especially heavy nature,

to give repeated strokes of the plunger thereto before releasing the blank-holder to permit a removal of the work.

The primary object of my invention is to obviate the difficulties incident to the use of the presses of this class heretofore employed, by the provision, in a press of this kind, of simple and highly efficient mechanism for imparting entirely independent movements to the blank-holder and plunger, whereby they may be moved in unison or separately at the will of the operator, and they plunger given repeated strokes or movements for the purpose of completely forming or finishing the work before the same is released by the holder.

Further objects of the invention, as well as the operation, construction and arrangement of the parts thereof, will appear by reference tion, with both the work-holder and forming plunger in lowered position. elevation thereof. Fig. 3 is a vertical transverse section of the blank-holder on the dotted line 3 3 in Fig. 1. Fig. 4 isa partial side elevation of the machine showing the position of the piston-rod .and connected toggle-arms of the,blank-holder when the latter is in raised or inoperative position. Fig. 5 is a centraltransverse vertical section of the 'machine showing the blank-holder raised and the plunger lowered, and Fig. 6 is a horizontal section on the dotted line 6 6 in Fig. 1.

Referring to the drawings, 7 designates a fixed frame of suitable construction forming the bearings for the working parts, and having a bed or bolster 8 at its base to which the female die or matrix 9 is fixed. The blankholder 10, which, when lowered, cooperates with the marginal surface portion ofn the ma'- trix 9 to hold the work, has its vertical movement suitably guided by the fr ame sides, and is suspended from the two parallel rockshafts 12, 12 by means of the sets of togglearms 13 and 14, the former of which, are fixed to their respective shafts while the latter have their lower ends pivoted to the blank-holders, as at 15. At one side of the frame 7 is disposed a vertical cylinder 16 carrying a piston 17, the piston-rod 18 of which projects from the upper end thereof and operates in guides 19 secured to the frame side. This rod carries a collar or enlargement 20, which is operatively connected to the two shafts 12 by the links 21 and crank-arms 22, thus providing toggle connection between the piston-rod and said shafts whereby a movement of the former will rock the shafts and effect a raising or lowering of the blank-holder. The actuating fluid, whether it be steam, compressed air or hydraulic pressure, is admitted to the chest 23 of the cylinder 16 through the pipe 24 and is exhausted through the pipe 25, such admission being controlled by the valvelever 26, while the admission of fluid to the cylinder for operating `the piston is controlled by the cylinder-valve lever 27. It is understood that these valves may be of any suitable construction. The press-plunger 28,

Fig. 2 is a side having a forming-head 29 suitable to the l ger is raised and brought to rest at its highest matrix 9, is carried at the lower end of a piston-rod 30, which is suspended from and moves with a piston-head 31 operating in the vertical cylinder 32 on the top of the frame 7. This plunger operates through a registering opening 11 in the blank-holder 10 and is provided with guides 33, which move in guide-grooves 34 provided in the blankholder at the ends of said opening. The admission of actuating fluid to the chest 35 of the cylinder 32 is controlled by the lever 36, and the admission of .fluid to the cylinder from its chest is controlled by the cylindervalve lever 37, both of which levers connect with their valves through suitable intermediate mechanism, as shown in Figs. 1 and 2.

The operation of the press is as follows z- The work being placed on the matrix 9, the valve-lever 27 1s operated to admit the actuating fluid to the p roper end of the cylinder 16 to effect a raising of the piston 17 and attached parts from the normal position shown in Fig. 4,.and a consequent rocking of the shafts 12, 12 and lowering of the blankholder 10 to clamp the work tov the matrix. When the blank-.holder is lowered the toggles 13 and 14 are straightened as shown in Figs. 1, 2l and 3 and lock the holder in lowered position. The work having been clamped by the blank-holder, the plunger 28, which is normally elevated, is set in motion, to form or draw the blank into the desired shape, by moving the cylinder-valve lever 37 in the proper direction to admit the fluid above the piston 31 in the cylinder 32, thereby forcing the piston and attached parts down and causing the forming head to operate on the work. The plunger after making its downward stroke is elevated, either to. repeat the stroke or to enable the work to be removed, by reversing the position of the lever 37, thus admitting fluid below the piston and forcing it to` its normal elevated position. On the completion of the forming operation the position of the lever 27 is reversed to admit the actuating agent to the cylinder 16 above its piston, thus forcing the piston downward to operate the toggles 21 and 22 to rock the shafts 12 in the proper direction to elevate the blank-holder 10 through the movement imparted to the toggles 13 and 14, and release the work to permit its removal from the press.

It is thus apparent that I have provided a drawing or toggle-press which is provided with entirely independent means for controlling the movements of the blank-holder and forming-plunger thereof, whereby said parts may be worked simultaneously or separately as desired, and permitting repeated strokes or movements of the plunger to finish the work during a continuous engagement thereof 'by the blank-holder, after which the plunstroke and the blank-holder then raised to release the work and brought to rest at its highest stroke. This feature is of the utmost importance in machines of this class as the movements of the plunger and blankholder are thereby placed absolutely under the control of the operator and may be moved in unison, as has heretofore been the practice, or separately as the nature or condition of the Work may require.

While I have shown and described a particular construction and arrangement of the parts of the features of my invention, I desire it to be understood that I do not restrict myself to such construction or arrangement, as obvious modifications will occur to a person skilled in the art.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is,- v

1. In a press of the class described, a frame, a blank-holder vertically movable in the frame, a forming plunger adapted to work downwardly through the blank-holder in its forming operation, a cylinder at the top of the frame, a piston mounted in the cylinder, a piston-rod projecting downwardly from the piston and carrying the forming plunger at its lower end, a second cylinder mounted at the side of the frame, a piston operating therein, a piston-rod projecting upwardly from said latter piston, a pair of rock-shafts journaled transversely of the frame and having cranks projected therefrom and connected to said latter piston-rod, toggle-connection between the rock-shafts and blank-holder, and independent means associated with each cylinder for controlling the movement of the pistons.

2. In a press of the class described., a frame, a vertically-disposed cylinder at the top of the frame, a piston mounted in said cylinder, a piston-rod projecting downwardly from the piston, a forming plunger carried at the lower end of the rod, a secondl vertically-disposed cylinder carried at the side of the frame, a piston operating therein, a piston-rod projecting from the piston, a blank-holder movable in the frame and having an opening through which the plunger works, toggle mechanism connecting said latter rod and blank-holder to impart movement from one to the other, and independent means associated with each cylinder for controlling the movements of the pistons.

In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

HENRY J. I-IINDE.

Witnesses:

HAZEL B. HIETT, CORNELL SCHREIBER.

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