US1473558A - Punch - Google Patents

Description

Nov. 6, 1923. 1,473,558

J. JENSEN PUNCH Filed NOV. 9. 1922 F'- 2 FTE- 5 lNvENTmH JDHN IENEEN y AT1-YE..

@www1 Patented Nov. 6, 1923.y

JOHN JENSEN, OF ROCKFORD, ILLINOIS, ASSIGNOR TO WHITNEY METAL TOOL COM- PANY, OF ROCKFORD, ILLINOIS, A. CORPORATION OF ILLINOIS.

PUNCH.

Application filed November 9, 1922. Serial No. 599,770.

To all whom t may concern.'

Be it known that I, JOHN JENSEN, a citizen of the United States, residing at Rockford, in the county ofl YWinnebago and State of Illinois, have invented a certain new and useful Punch, of which the following is a specification.

My invention relates to improvements in punches and particularly to hand punches adapted for perforating metals or other hard materials.

Hand metal punches are especially adapted for use in building structures where scaffolds are not provided and in other places ordinarily inaccessible. In many places it is frequently desirable that the punch require very little space in 'which to operate.

One of the purposes of my invention is to provide a hand punch of this type which by `virtue of the form and relation of its parts can be used in a smaller space than has been possible in the past.

A further object of my invention is to provide a portable punch which although light in weight will be durable and strong and ,which will be comparatively easy to operate.

Further objects and advantages will become apparent as the description proceeds.

The objects of the invention thus generally stated are attained by the construction and arrangement illustrated in the accompanying drawings forming part hereof wherein Figure 1 is a side view of the punch in its open position, with dotted lines indieating the other extreme position of the operating lever. Fig. 2 is a view taken along the line 2 2 of Fig. 1. Fig. 3 is a view taken in the plane of line 3-3 in Fig. 2.

The exemplary embodiment of my invention comprises a stationary arm 1 for housing a die 2 and a punch 3, an engaging member 4 for the punch, and an operating lever 5 for reciprocating the punch, through the agency of said engaging member.

The stationary arm 1 constitutes a handle 6 which is bent downwardly to form an oii set and a forked head 7 comprisingan upper extension 8 and a lower extension 9 between which the material to be operated on is inserted. The die 2 which is made of any suitable material such as crucible tool steel and which is provided with a central aperture 10, is screwed into a tapered bore in the lower extension or fork 9. The upper fork has a vertical bore 11 positioned directly above the aperture 110 Vwhich Vaccommodates the punch 3 in its reciprocating movement into and out of the aperture 10. 'Thepunch 3 is provided with anotched head 12 which is engaged by a T-shaped slot 13V in the free end of the engaging member 4.

The engaging member 4 is pivoted to the stationary arm 1.at 14. The free end of the engaging member 4 has a transverse bore 15 and a vertical annular slot 16 opening into said bore. The bore 15 is provided at each end with acircular -traclrway 17 for accommodating a pluralityz of roller bearings 18. A circular member 19 which in effect forms one end of the operating lever 5, and which in this case is made by securing two circular plates to the opposite sides of the rounded end of said lever by means of the pin 21, is disposed for rotary movement within the bore or bearing 15. The roller bearings 18 are interposed between the memf ber 19 and the inner surface of the bore 15 and act to reduce friction and wear, whereby the life of the device is yconsiderably prolonged. The operating lever 5 which has no appreciable oifset but which is about-straight in form is adapted for movement in the slot 16. To assemble, the circular end of the lever 5 is first inserted into the bore 15 through the slot 16, and the plates 20 are then secured thereto.

The circular member 19 is eccentrically pivoted to the upper ends of the two plates 22 by means of the pin 23. The plates are,

pivoted at their other ends to opposite sides of the head 7 by means of the pin 24. Any suitable means such as the nuts shown in Fig. 1 may be employed to retain the pins in bore 15 whereby the roller bearings 18 are Y lvide ample space between the operating members for the convenience of the operator in grasping the same, the upper member has been formed with an offset, while the lower member has been made substantially straight. The angle included by the two members when in an open position was therefore unduly large and frequently acted to limit the usefulness of the punch. In

making the arm l with an oiset and the operating lever with an approximately straight handle, the angle subtended by the two is reduced by the angle included by the offset, but the convenience. of the tool is in no way diminished. In the present instance the angular space required :tor the operation of the tool is reduced by about 2O degrees. The punch illustrated herein can therefore be operated in an angular space of about '70 degrees, an improvement which will add materially to the utility thereof.

l desire to point out that while the invention has been illustrated and described with considerable particularity I contemplate that various changes in term, construction and arrangement ot' parts may be made by those skilled in the art without departing from the spirit and scope of the invention as expressed in thel appended claims.

I claim as my invention:

l. A punch having, in combination, a stationary arm having a forked head, a punch slidable in said head, an engaging member pivoted to said arm and having operable connection with said punch, said member having a bore in one end, a cylindrical member extending through said bore, roller bearings between said bore and said cylindrical member, plates eccentrically connected at one end to said last mentioned member whereby the roller bearings are retained in place and connected at the other end to said head, and means for turning said cylindrical member within said bore.

2. A punch having, in combination. a stationary arm having a forked head and a handle shaped to form an offset, a punch slidable in said head, an engaging member pivoted to said arm and having operable connection with said punch, said member having a bore in one end and a slot comnmnicating with said bore, a rotatable member extending through the bore. roller bear'- ings between said bore and said rotatable member, and an operating lever extending through said slot and having an approximately straight handle for turning said rotatable member. Y

3. A punch having, in combination, a stationary arm having a forked head, a punch slidable in said head, an engaging member i'or securing the upper end of said punch, said engaging member having a transverse bore with a trackway on its inner surface, a cylindrical member extending through said bore, roller bearings in said traclrway for engaging the surface of the cylindrical member when rotating, plates pivoted eccentrically at one end to said cylindrical member and connected. at their other end to said arm, said plates thereby acting to connect said arm and said cir cular member and to prevent said bearings from leaving their traclrway, and an operating lever rigidly connected to said cylin drical member to turn the latter whereby the punch is actuated.

4. A punch comprising, in combination, a head having a pair oi jaws spaced apart, the upper one of saidl jaws having a cutting element slidable vertically therethrough, an

operating lever pivotally connected with the.

head and arranged to actuate said element, and a handle formed integral with the head and having a do-wnwardly offset portion at its free end, the arrangement being such that when the cuttingV element. is entirely withdrawn into the upper aw so as to permit the insertion of a part of maximum thickness to be perforated between the jaws, the lever forms with the handle an angle substantially less than 90 degrees, and when the lever is swung into its eXtreme downward position its free end is spaced a substantial distance `from the free end of the handle.

In testimony whereof, I have hereunto aiixed my signature.

JOHN JENSEN,

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