US1356248A

US1356248A - Punching and shearing machine

Info

Publication number: US1356248A
Application number: US363217A
Authority: US
Inventors: John M Wilcox
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-03-04
Filing date: 1920-03-04
Publication date: 1920-10-19
Anticipated expiration: 1937-10-19

Description

J. M. WILCOX.

PUNCHING AND SHEARING MACHINE.

APPLICATION FILED MAR. 4, 1920.

' Patented Oct. 19, 1920.

2 SHEETS-SHEET 1.

J. M. WILCOX. PUNCHING AND SHEARING MACHINE.

APPLICATION FILED MAR.4, 1920. 1,356,248, Patented Oct. 19, 1920.

2 SHEElS-SHhET Z.

UNITED STATES PATENT OFFICE.

JOHN M. WILCOX, OF CLEVELAND, OHIO.

PUNCHING AND SHEARIN'G MACHINE.

Application filed March 4,

To all to from it may concern:

Be it known that 1, JOHN M. WILoox, a. citizen of the United States residing at Cleveland in the county of duyahoga .and State of hio, have invented a certain new and useful Improvement in Punching and' Shearing Machines, of which the following is a full, clear, and exact description, ref

erence being had to the accompanying drawings.

This invention relates to punching and shearing machines and more particularly to that class of machines which employ toggle blocks for actuating the movable member.

Heretofore it has been the custom with machines of this character to complete the punching or shearing operation with a single stroke of the toggle, and because of the enormous instantaneous stresses set up during this operation, it has been necessary to build a machine of unusually large size and heavy Weight. stationary and when large and unshapely material is to be accurately positioned under the movable member, a large number of men are required to steady the material in addition to the crane which supports the weight thereof.

It is the object of my invention, therefore, to provide a machine capable of exerting the required force for punching said holes and yet consist of so few and simple parts as will be sufficiently light in weight to permit carrying the machine to the work by a small crane or other support and there be accurately and quickly positioned on the center punch mark with the help of only one or two men.

Another object is to provide a machine of this character which shall be so constructed that it will exert a maximumpunching effort with a minimum input of power.

Another object is to provide a novel feed device whereby the punch is enabled to exert a plurality of strokes in overcoming the shearing stress of the material to be punched.

Specification of Letters Patent.

Such machines are usually Patented Oct. 19, 1920. 1920. Serial No. 363,217.

of which will be fully described hereinafter and pointed out in the claims hereto an nexed.

In the accompanying drawings wherein I have shown certain illustrative embodiments of my invention but without intent to limit myself thereto, Figure 1 is a side elevation of my machine; Fig. 2 is a top plan view thereof; Fig. 3 is a section taken on the line 33 of Fig. 1; Fig. 4 is an enlarged section taken on the line 14 of Fig. 3; Fig. 5 is a detail view of one form of toggle actuatingmechanism; Fig. 6 is a detail sectional view of the auxiliary punch actuating mechanism; Fig. 7 is a side elevation of a modification of the toggle actuating mechanism; and Fig; 8 is a top plan view thereof.

Describing the various parts by reference characters, '1 indicates the side frames of my machine which are held in spaced relation by suitable transverse bolts 2 and also by the toggle actuating mechanism interposed therebetween which will be fully described hereinafter. A pair of toggle members 3-3 are pivotally connected at their lower ends to the cross head 4, which is slidably mounted in the bearing block 5, the latter being fastened between the side frames- 1. At their upper ends the toggles 33 are each pivotally connected to the toggle blocks 6-6 and these blocks slidably abut the wedge shaped feed blocks 7 7. A U-shaped strap 8 surrounds the toggle mechanism and is securely fastened at each end to the side frames 1 as indicated at 10. Disposed about the upper end of the U-shaped strap 8, is

- a collar 11 from which projects the feed screw 12. Each of the feed blocks'7-7 is connected at their larger end by a transverse arm 13, and a hand wheel 14 is rotatably journaled therein intermediate the end thereof and in alinement with the feed screw 12. It will thus be apparent that as the hand Wheel 14: is rotated on the screw 12 to advance inwardly toward the collar 11, the feed blocks 77 will be moved inwardly simultaneously and force the toggles downwardly.

A. pair of arms 16-'16 are each pivotally connected at one end to each of the pivotal joints 1717 of the togglesand at the other end each arm is connected to the respective bellcran'ks 18-18 journaled on a common shaft 19 which is mounted in the vertical brackets 2020. Disposed on the side frames 1 and rearwardly of the brackets 2020 are a pair of bearing blocks 2121 which rotatably support the shaft 22 the outer end of which has keyed thereto a worm gear wheel 23. A pair of cam disks 2424 are fastened to the shaft intermediate the side frames 11 and each cam disk is provided with a strap 25, the upper ends of which are pivotally and adjustably connected with each of the bellcranks l818. The cam disks are preferably so positioned on shaft 22 as to be in opposite phase so that when one toggle member is straight, the other will be relaxed to its maximum degree. A bracket 27 is fastened to the rear end of one of the side frames 1 and supports any suitable source of power such as an electric or air motor 28 which is provided with a worm drive wheel 29 adapted to mesh with the worm gear 23.

The forward end of the side frames 1 are each provided with an integrally formed projection 31 which supports a cylinder 32. A piston 33 is slidably mounted therein and is provided with a connecting rod 34 which is connected at its lower end to an arm 35 preferably formed integral with a vertical shaft 36 which is positioned under the cross head 4. Fluid under pressure is admitted.

from the supply line 37, through the valve 38 to the pipe line 39 leading to the cylinder head. A by-pass 40 provided with a check valve 41 communicates with the middle and lower portion of the cylinder so that when the piston 33 passes the upper branch thereof, the fluid will escape therethrough and cushion the descent of the piston. Then the valve 38 is rocked in the opposite direction the fluid supply line 37 is connected through the pipe 42 to the lower end of the cylinder to force the piston 33 upwardly; the check valve 41 preventing the by-pass from functioning.

Suitable petcocks

43, 44 are tapped in the

pipes

39 and 42, respectively, to relieve any back pressure or vacuum which may be created by the movement of the piston 33.

A bail 45 is preferably attached to the side plates l-1 at the center of gravity of the machine so as to permit easy handling thereof with the aid of a small crane. A pair of guide rollers 4646 are journaled each in one of the arms 47-47 which are adjustably attached to the projections 3131 thereby facilitating the movement of the machine over the work. The punch 48 is detachably connected to the vertical shaft 36 by a coupling nut 49 to permit various sized punches, shearing blades or similar tools to be used.

In operation, the machine is suspended over the work by the bail 45 and the guide rollers 4646 adjusted to the surface thereof. Since the machine is comparatively small and light in weight it may be accurately and qui kly positioned over the center mark of the hole to be punched, by one man, while a second man operates the machine in the following manner: Valve 38 is rotated to cause piston 33 to descend which carries the punch down to the center mark as previously described. The motor is now started which rotates gear 23 and shaft 22 thereby oscillating the bell-crank 1818 through the medium of cams 2424 causing the toggles 33 to break and straighten alternately. The hand wheel 14 is now rotated to feed the toggle blocks and toggles downwardly until the cross head 4 contacts with the shaft 36. As each toggle straightens the punch 48 is forced downwardly into the metal. The hand wheel 14 is rotated slowly to take up the downward movement of each toggle until the shearing stress of the metal is overcome, at which time the pressure which has been continuously applied to the top of piston 33 will force the punched blank through the hole. A collar 52 which is fastened to the cross head 4 above the bearing block 5 prevents the cross head and toggle mechanism from descend ing farther with the punch. The operator now reverses the valve 38 which forces piston 33 and punch 48 upwardly to clear the hole when the machine may be moved to the next punch mark.

The adjustable connection between the bellcranks 1818 and cams 2525 permit a maximum and minimum stroke of the toggles, the former to be used on light work where the shearing stress of the metal is not so great, and the latter on heavy Work where the shearing stress is high and a short stroke more advantageous.

In Figs. 7 and 8, I have shown a modification of the toggle actuating mechanism, wherein a single cam disk 60 is mounted on the shaft 22. The toggles 6161 are mounted to break alternately in opposite directions and. each is connected to one of the angularly disposed arms 6262 by a link 63. The arms 62-62 are rigidly mounted on shaft 19 and a single arm 63 also rigidly fastened thereto extends rearwardly therefrom. An adjustable rider 64 is slidably mounted on the arm 63 and is pivotally connected at the lower end thereof to the cam strap 65. Adjustment of the rider and hence the effective length of arm 63" is effected by the screw 66 swiveled in projection 67 of arm 63 and threaded in the top portion of the rider. The operation is similar to that previously described except that the stroke of the punch 48 is varied by the screw 66 instead of the adjustable connection between the bellcranks, and the cam straps.

While I have described my machine as being swung from a crane and adapted for a particular use, it will be understood that it may be bolted down in the usual manner and that various tools may be substituted for the punch.

Having thus described my invention, what I claim is:

1. A device of the class described comprising a support, a toggle member mounted in said support, means for connecting a tool to one end of said toggle, a feed device positioned in operative relation to said toggle member and adapted to feed said member and tool through the work in a direction parallel to the line of thrust of said tool, and means for actuating said toggle.

2. A device of the class described comprising a support, a toggle member mounted in said. support, means for actuating said toggle, a tool operatively connected to the lower end of said toggle, a feed device positioned in operative relation to said toggle member and adapted to feed said member and tool through the work, and means for exerting an additional force on said tool.

3. A device of the class described comprising a support, a plurality of toggles slidably mounted in said support, a tool operatively connected to said toggles, eccentric means for alternately actuating said toggles, a wedge block for moving said toggles and saidtool into operative engagement with the work and means for exerting an additional force on said tool;

4:. A device of the class described comprising a support, a plurality of toggle members mounted in said support, a tool opera actuating said toggles alternately, and a feed device for moving said toggles and said tool in operative engagement with the work.

5. A device of the class described com prising a support, a plurality of toggles slidably mounted in said support, a tool operatively connected to said toggles, eccentric means for successively actuating said toggles, a wedge block for moving said toggles and said tool into operative engagement with the Work and means for varying the stroke of said toggles.

6. A device of the class described comprising a support, a plurality of toggles mounted in said support and adapted to break and straighten alternately, a tool disposed in operative relation to said toggles, a cylinder mounted on said support, a piston slidably mounted in said cylinder and operatively connected to said tool, and fluid pressure means for actuating said piston.

7. A device of the class described comprising a support, a plurality of toggle members mounted in said support, a tool operatively connected to said toggles, means for actuating said toggles, a feed device for moving said toggles and said tool in successive steps through the work, and means for varying the stroke of said toggles.

8. A device of the class described comprising a support, a plurality of toggles mounted in said support and adapted to break and straighten alternately, a tool disposed in operative relation to said toggles, and means for exerting a force independent of said toggles on said tool.

9. In a device of the class described, the combination of a support, of a pair of toggles slidably mounted in said support, eccentric means for actuating said toggles alternately involving a pair of cams each adjustably connected to said toggles, a tool operatively connected to said toggles and means for feeding said toggles and said tool into operative relation to the work.

10. In a device of the class described, the combination with a support, of a plurality of toggles mounted therein, an eccentric mounted on said support and adapted to be rotated, operative connections between said eccentric and each of said toggles and'means for adjusting said connections to vary the stroke of said toggles.

11. In a device of the class described, the combination with a support provided with a plurality of toggles slidably mounted therein, of a tool disposed in operative relation to said toggles, and means independent of said toggles for exertin a force on said tool and for returning sai parts to normal position.

12. In a device of theclass described, the combination of a support provided with a pair of toggles slidably mounted therein, of a tool operatively connected to one end of said toggles, a taper block slidably mounted at the other end of said toggles, and adapted to move said toggles and tool bodily into engagement with the Work, means for adjusting said block relative to said toggles and means for operating said toggles.

13. In a device of the class described, the combination with a support, of a pair of toggles slidably mounted in said support, means for adjusting the stroke of said toggles, a tool operatively connected to said toggles and means for exerting a force on said tool in addition to that exerted by said toggles.

14. In a device of the class described, the combination with a support, of a pair of toggles slidably mounted in said support, and fluid actuated means for'adjusting said toggles relatively to the work independent of the actuating means for said toggles.

15. In a device of the class described, the combination with a support, of a tool slidably mounted in said support, and means for advancing said tool in successive steps through the work.

16. In a device of the class described, the combination with a support, of a tool slidably mounted in said support, means for engaging said tool with the work, and ad ditional means for advancing said tool in successive steps through the work.

17. In a device of the class described, the combination with a support, of a tool slidably mounted in said support, means for engaging said tool with the work, and ad- 10 ditional means for delivering successive impulses to said tool.

In testimony whereof, I hereunto afiix my signature.

JOHN M. WILCOX.