US576338A

US576338A - Metal-punching machine

Info

Publication number: US576338A
Authority: US
Publication date: 1897-02-02
Anticipated expiration: 1914-02-02

Description

1 vention.

UNITED STATES PATENT OFFICE.

RICHARD A. BRINE, OF REVERE, MASSACHUSETTS.

METAL-PUNCHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 576,338, dated February 2, 1897. Application filed March 3, 1896. Serial No. 581,701. (No model.)

T0 at whom it may concern:-

Be it known that I, RICHARD A. BRINE,a citizen of the United States,residing at Revere, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Metal-Punching Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a plan of a metal-punching machine constructed in accordance with my in- Fig. 2 is a front elevation of the same, one of the die-holders being removed. Fig. 3 is a horizontal section on the line3 3 of Fig. 2. Fig. 4 is a vertical section through the upper portion of the machine on the line a 4 of Fig. 1. Fig. 5 is a vertical section on the line 5 5 of Fig. 2. Fig. 6 is a perspective View of one of the pinich-carrying plungers and its operating-lever. Fig. 7 is a view of one of the cylindrical strippers, and Fig. 8 is a view of the holder for supporting the same.

My invention relates to inetal-punchingmachines which are adapted to be operated by hand, and particularly to a machine of this description in which a series of punch-carrying plungers are arranged within a single frame or casting and are adapted to be operated separately and independently of each other by means of suitable levers. To simplify and improve the construction of machines of this character, whereby they may be operated more conveniently and effectively than heretofore, is the object of my invention, which consists in certain novel features and combinations of parts, as hereinafter set forth and specifically claimed.

In the said drawings, A represents the frame of the machine, preferably cast in one solid piece, the base a of which is provided on the front side with recesses I), having slightlyraised seats 10, upon which are placed a series of cylindrical dies 0, each of which is provided at its bottom with a flange cZ, above which the die is embraced by a bifurcated angular holder B, the front vertical portion of which is secured to the base a by a screw-bolt e, the dies being thus made easily removable, when required, to enable othersof different sizes to be substituted therefor. These dies are each centered at the rear by means of two adjusting-screws f f, passing horizontal] y through the base a into the recess 1) at an angle to each other, as shown in Fig. 3, the die resting against these screws, which thus form a gage to determine its position with respect to the punch which cooperates therewith. Each die is provided with a cooperating punch g, removably secured to a vertical plunger .D by means of a set-screw It, said plungers sliding in suitable guides in the upper portion 12 of the frame A, which is provided on its front side with recesses 15 in line with the plungers to render the set-screws it accessible when the punches are to be removed or replaced. Each plunger D is provided with an enlarged bifurcated head 20, as shown in Fig. 6, within which is fitted a cam-shaped lever G, pivoted on a pin 21 between a pair of cars I; 1', cast integral with the frame A, said lever being provided at its outer end with a socket 22 for the reception of a long removable bar or handle k, by which a powerful leverage is obtained as required.

The cars 2' t' and the levers G between the same are arranged diagonally with respect to the front of 1 and 2, whereby the outer end of the handle of each lever can be brought down below the level of a large plate, being punched without interfering therewith, and still be in a convenient position to be operated by a person standing in front of the machine, which would not be the case if the operating-lever was arranged at the end of the frame, as in many machines hitherto constructed.

The upper portion 12 of the frame is connected at its ends only with the base, so that an unobstructedopen space is formed between the base and the part 12 to receive the work or plate to be punched. This will allow a long plate to be drawn through the frame for the action of any or all of the punches, while the diagonal arrangement of the levers will prevent them from striking such a plate.

The bifurcated head of each plunger D is made in the shape of a hook, as shown at n in Fig. 6, and on each side of the cam-lever is a supplementary cam m, Fig. 6, which when the leveris raised acts upon the overhanging hook-shaped portion at, thereby lifting the plunger to withdraw the punch from the the machine, as shown in Figs.

metal. The'surface of the plunger-head upon which the cam-lever bears consists of a removable hardened-steel plate 19, which takes the wear of the cam-lever and is held in place by a lip or flange q, formed integral with the head, as shown in Figs. 4 and 6.

It will be seen that the lever G may be removed at any time by simply withdrawing the pin 21 and then pulling the lever out through the open end of the horizontal slot formed by the .hook it. Thisleaves the plunger free to be withdrawn vertically upon removal of its set-screw 7b. The construction of the cam-lever to bear directly down upon the upper end of the plunger to project the same obviates all liability of any springing apart of the parts during heavy work, as would be the tendency in case the plunger was provided with a vertically-forked upper end having inwardly-extending lugs entering camgroovcs in the opposite sides of an operatinglever. The separation of the parts is much more easily effect-ed in my construction than where the lugs and grooves are employed, since in the latter construction the frame would have to be taken apart as well as the plunger itself.

Each punch is provided with a hollow cylindrical stripper H, Figs. 2, 5, and '7, having on its front side aslot or opening 0' to enable it to embrace the punch and also afford a passage for the set-screw h, by which the punch is secured to its plunger. This stripper, the lower portion of which is made tapering, isimmovablyheld up securely and firmly against the under surface of the top portion 12 of the frame A by an angular U-shaped holder I, which is provided with projections 24, fitting into recesses 25 in the stripper, and is secured to the rear side of said frame by a screw-bolt 23, passing through a slot 8, whereby the holder with its stripper can be readily removed when required. The stripperis thus always held with its under surface perfectly square or parallel with the surface of the metal being punched and prevents the latter from being raised or tilted up on one side as the punch is being withdrawn, which would be liable to spring the punch out of true, thus necessitating its removal.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

1.. The combination with the frame and the plunger having an overhanging bifurcated hook on its upper end, of the pivoted lever extending through the hook bifurcation and provided within the hook with a cam-head, the full lower cam-surface of which bears on the upper end of the plunger to project said plunger; the said cam-head being provided at opposite sides with auxiliary cam-surfaces engaging the under side of the hook at opposite sides of its slot or bifurcation, substantially as set forth.

2. The combination with the frame having parallel diagonally-arranged ears, of the reciprocating plunger having a horizontally-extending, bifurcated, open hook 011 its upper end between said ears, a lever extending down through the hook bifurcation and provided within the hook with a cam-head, the lower cam edge of which bears upon the upper end of the plunger to project it; said camhead having auxiliary cam surfaces or shoulders on its opposite sides and engaging the under side of the overhanging hook at both sides of its slot, and a transverse pin extending through said ears and cam-head, substantially as set forth.

3. The combination with the cylindrical stripper, of a horizontal U-shaped support embracing said stripper and having an attaching member, and interlocking connections between the arms of said support and the said stripper, whereby the stripper may be inserted and removed through the open end of its support, substantially as set forth.

4. The combination with the horizontal U- shaped support provided with projections on the upper sides of its arms and havinga slotted attaching member at right angles to said arms, of the cylindrical stripper fitting between the arms of said U-shaped support and having recesses in its opposite sides receiving the said projections, substantially as set forth.

5. The combination with the frame, its punch and die, of a vertically-adjustable, horizontal U shaped support mounted on the frame with its arms ext-ending at opposite sides of the punch, a tubular or cylindrical stripper embraced by said U shaped support and held firmly, but removably, against the under side of the upper portion of the frame by the upward adjustment of said U-shaped support; the lower edge of the tube or cylinder serving to strip the work from the punch, substantially as set forth.

(3. The combination with the frame, its punch and die, of the horizontal U-shaped support straddling the punch and having an upwardly-projecting slotted arm, a set-screw extending through said slot for adjusting the support toward and from the under side of the upper portion of the frame, a tubular or cylindrical stripper seated removably upon the said U-shaped support, with its upper edge clamped thereby to the frame and its lower annular edge next to the die, to engage the work and strip it from the punch, substantially as set forth.

7. The combination with the frame, its punch and die, of the U-shaped holder, the removable tubular stripper, seated in and held firmly to the under side of the upper portion of the frame by said holder and having its lower end tapered downwardly and inwardly to engage the work as close to the punch as possible, substantially as set forth.

8. The combination with the frame having a die-recess 1) extending inwardly from the front side, and a punch thereabove, of j a flanged die in said recess, horizontal adjusting-screws, extending inwardly into the die recess from the rear side of the frame, and an adjustable horizontal U -shaped holder fitting the frame-recess and embracing thefront side of the die above its flange, and clamping it down to the frame, substantially as set forth.

9. The combination with the frame and its die-recess extending inwardly from the front side, and the punch thereabove, of the flanged die in the recess, the horizontal set-screws entering the rear end of the recess, and engaging the rear side of the die above its flange, and the angular holder having a horizontal member fitting the front end of the die-recess and engaging the die-flange andadepending member resting against the front of the frame and secured removably thereto by a screw or bolt, substantially as set forth.

10. The stripper H in the form of a tube having a tapering lower end and provided with opposite recesses 25 in its outer side, substantially as set forth.

11. The stripper-support comprising a horizontal U-shapcd member I, having lugs 24 on the upper side and between the ends of its two arms and an upwardly-projecting longitudinally-slotted attaching-arm at its closed end, substantially as set forth.

12. The combination with the frame comprising a base portion having a series of dies 011 its upper side, and a top portion connected at its ends only with the ends of the base and having a series of pairs of diagonally-arranged ears on its upper side, of a series of punchplungers mounted in the top portion of the frame over the dies, and a series of cam-1evers pivoted between the said ears and operatively connected with the upper ends of the plungers to throw them positively in both directions, substantially as set forth.

Witness my hand this 29th day of February, A. D. 1896.

RICHARD A. BRINE.

In presence of- P. E. TESOHEMAOHER, B. L. MARDEN.