US942291A - Hand punching-machine. - Google Patents

Description

Patented Dec. 7, 1909. 2 SHEETS-SHEET 1.

H. SIEGRIST.

HAND PUNGHING MACHINE.

APPLICATION TILED SEPT. 16, 1908.

H. SIEGRIST.

' HAND PUNOHING MACHINE. APPLICATION FILED SEPT. 16, mos.

Patented Dec.7,1909.

2 SHEETS-SHEET 2.

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HEINRICH SIEGBIST, 0F OBERWIL, SWITZERLAND, ASSIGNOR TO WEIDMANN & 00., OF ZURICH, SWITZERLAND.

HAND PUNCI-IING-MACHINE.

Specification of Letters Patent.

Patented Dec. 7, 1909.

To all whom it may concern:

Be it known that I, HEINRICH SIEGRIST, a citizen of the Swiss Confederation, residing at Oberwil, Switzerland, have invented new and useful Improvements in Hand Punching-Machines, of which the following is a specification.

The present invention relates to a handpunching machine, which is particularly destined for use in railwayand bridge-constructions and constructed in such a manner, that the proportion between energy and work is very great so that thick iron bars, such as T irons, rails and the like can be easily punched.

The machine constructed according to the present invention dilfers from the punching machines of known constructions by the arrangement that the angle levers are combined to form four pairs of angle levers or two parallelograms of forces, the outer ends of the angle levers being attached to a double threaded spindle while the one of the lateral knee-joints is connected with a fixed support, and the other one, which corresponding to the direction in which the spindle revolves is laterally displaced, is connected with an angle lever or pressure lever which effectuates the operation of the tool. This arrangement, the parallelogram of forces, has the eflect that the lift of the knee joint which takes place when the spindle is rotated, is laterally displaced, wherefrom results an advantageous ratio of transmission with regard to the pressure lever which serves for operating the tool.

In the accompanying drawing the invention is illustrated by way of example.

Figure 1 is a longitudinal section of the punching machine. Fig. 2 is a section on line A-BCD of Fig. 1.

The punching machine shown in the drawing is particularly destined for punching rails.

Two nuts 6 and Z2 which have link-pins d and d? are mounted on the double threaded spindle a. The arms 0 c 0 and a of the angle levers are attached with their ends to the link-pins d and d so that they form (see Fig. 2) two pairs of parallelograms. The link-pin 0Z of the angle lever 0 0 is pivoted with its other end in the pressure lever h (Fig. 1). The link pin d of the angle lever 0 0 is pivoted with its free end in the upper end of the die-support 6. Two cranked cheeks f are linked at their upper ends to the die-support by means of link-pin g and at their lower ends by means of link-pin i to the pressure-lever h. Their free ends are conwhich carries the punch a. The die-support c is enlarged at its lower end which serves to receive the die 2 The die-support is hollow behind the die 2 so that the material which has been stamped out can drop out of the machine. As can be seen from Fig. 1 the head of the die-support c as well as the head of the cranked cheeks f have the shape of the piece to be worked, for example a rail, so that the machine can be securely fixed against the rail E.

In the lower part of the die-support c are mounted a guide bolt 0, a ratchet n (which is fixed to the support) and a bolt @12 to which are pivoted at both sides of the die-support the cover links is which receive between their free ends the eccentric w. The cover links are placed between the cranked cheeks f and the shackle m, which is pivoted to the bolt 0. The eccentric a; is mounted between the coverlinks is by means of axle w and serves for operating the checks 7 so that when the hand-lever 3 of the eccentric be pressed down the head f as well as the head of the die support 6 are pressed against the rail E. A stirrup t which is situated between the coverlinks is and guided by bolts 4) serves for maintaining the machine upon the rail E. This stirrup can be secured in its position by means of the nuts u.

The bolt 0 of the shackle m is guided in slot 79 and the shackle is properly adjusted after the eccentric 00 has been operated, so that it presses the head of the die-support against the stem of the rail, in which position the shackle is secured by means of the ratchet n which is brought into engagement with the corresponding tooth of the rack g, which forms part of the shackle. In this manner the head of the die-support is pressed against the stem of the rail even when the eccentric .70 has been released for withdrawing the punch 2. The die-support is removed ofi the rail by the lifting of handle .9 which is fixed at one side of the shackle m. A screw bolt 1' which connects the two cover links k passes through the die support 6 and serves for preventing the links i to turn around pivot w A handle bar 1 serves for actuating the nected by means of a removable head f a punching machine, the lever arms of said handle bar being of such proportions that the force required for the punching of rather thick work pieces can be produced by one man. The handle bar is fixed at the upper end of screw spindle a.

The operation of the punching-machine is as follows :After the stirrup t has been adjusted according to the distance between the upper edge of the rail and the center of the hole to be punched, the machine, in open position, is placed upon the rail to be punched; hereupon the spindle a is turned to the right by means of the handle bar until the guide-head f and the die 2 abut against the stem of the rail. Now the eccentric is fixed between the links In by means of the axle 10 and said links 70 are pressed against the head of the diesupport by the downward movement of the lever of the eccentric, so that the stem of the rail is clamped in between the two heads. The shackle m is placed over the rail and the handle bar Z is turned so that in consequence of the rotation of spindle a in the right hand direction the nuts 5 and approach and the links 0 0 c and 0 approximately assume the horizontal position. The die-support e being fixed by means of the eccentric a: the parallelograms are laterally displaced toward the pressure lever h, which pivoting around its pivot 2', pushes forward the punchs which punches the hole. To withdraw the punch a and to remove the machine the eecentric m is first released by means of lever y and removed after the axle w has been taken out, whereupon the spindle is turned to the left and shackle m is lowered.

If the punching machine is destined to be used with rails it can be preferably mounted upon a carriage R, as shown in Fig. 1 in dotted lines, so that it can be lifted and lowered by means of a lever H and support S according to requirement, linkpin G serving for connecting lever H with the diesupport 6 and link-pin F serving as pivot for lever H.

I claim 1. A punching machine comprising in combination with a double threaded spindle and with two nuts, one for each of the threads of said spindle, the die-support, means for attaching the machine upon the work-piece, a pivot at the upper end of said die-support, a rod pivoted with one end to said pivot and with its other end to the upper nut of the screw-spindle and a second rod pivoted with one end to said pivot and with its other end to the lower nut of the screw-spindle, a pressure-lever, a pivot at the upper end of said pressure-lever, a rod pivoted with one end to said pivot and with its other end to the upper nut and a second rod pivoted with one end to the pivot and with its other end to the lower nut of the screw-spindle, so that the four rods form two parallelograms of forces acting in lateral direction upon the upper end of the pressure-lever, the punch situated in front of the lower end of the pressure-lever, a rcmovable guide-piece for the punch opposite the die, two cranked cheeks linked with their upper ends to the die-support and carrying between their lower ends the said guidepiece for the punch, a bolt fixed in said cranked cheeks serving as pivot for the lower ends of the pressure-lever, means for pressing the cranked cheeks with the guide-piece for the punch and the die-support against the work-piece and means for moving the screw-spindle so that it acts upon the punch, substantially as described and shown.

9.. In an improved punching-machine the means for simultaneously pressing the guide-piece for the punch and the die-support against the work-piece comprising in combination with said die-support and the cranked-cheeks hinged to the same with their upper ends, a bolt fixed in the rear end of the die-support so that it projects from the same with both ends, cover-links pivoted upon said bolt and projecting with their other ends over the rear ends of the cranked-cheeks, an axle fixed between the free ends of said cover links and an eccentric keyed upon said axle so that it bears against the rear ends of the cranked-cheeks, and a hand-lever for revolving said axle, substantially as described and shown.

3. In a punching-machine the adjustable means for fixing the die-support upon the work-piece, comprising in combination, the die-support having a guide-slot, a guide-pin in said slot and a shackle fixed upon said guide-pin, a toothed part of said shackle and a ratchet-bar mounted in the die-support and adapted to engage with the toothing of the shackle, substantially as described and for the purpose set forth.

HEINRICH SIEGRTST.

\Vitnesses ARNOLD T. ZUBER, GEO. GIFFORD.

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