US2482582A - Portable tool - Google Patents

Description

w. H. GRAFE PORTABLE TOOL Sept. 20, 1949;

Filed Dec. 29, 1945 v INVENTOR.

Patented Sept. 20, 1949 2,482,582 PORTABLE TOOL William H. Grafe, Chicago,

111., assignor to Skilsaw, Inc., Chicago, 111., a corporation of Delaware Application December 29, 1945, Serial No. 637,814

6 Claims.

The present invention relates to improvements in portable tools and more particularly to hand held power driven tools of the metal cutting type.

Heretofore various tools have been designed for the purpose of shearing metal sheets or the like into a desired pattern. In a portable hand held power shear the operator holds the shear in one hand and presses it forwardly through the material as it cuts. The cutting action is usually performed with a reciprocating blade operating in combination with a stationary blade to cut a predetermined course through a metal sheet.

Inherent in the action of this type of shear is a deflecting action which forces at least the edge of the material being cut away, out of the plane of the main work piece. Where a narrow strip is being cut off it has a tendency to curl downwardly, around and back up against the work piece, jamming it against further forward movement.

One object of the present invention is to provide a shear that may be progressed through a work piece without jamming.

Another object is to provide means to deflect the material cut sufficiently so that it will not -curl against the work piece making it difficult to press the shear further into the work or otherwise interfere with the cutting operation.

Other obiects will be apparent to those skilled in the art from an understanding of the follow- 1 ing description and the drawings wherein one embodiment of the invention is set forth and explained for purposes of exemplification.

In the drawings:

Fig. 1 is a sectional View of the side of a tool showing the combination of parts making up the present invention.

Fig. 2 is a front View of the tool showing the location of the deflecting means.

Fig. 3 is a bottom plan view of showing the location of the deflecting means. 7

As exemplified herein, the shear may have a gear housing l a ram housing It and a tubular ram guide column it properly attached to the ram housing and supporting a customary supporting or foot member I 6 and its lower stationary blade member or die l8.

Through a gear train 20, partly shown, a driven member 22 is rotated in a suitable bearing 24 mounted in the gear housing H). An eccentric member 26 may be formed integrally with the driven member 22 and extend into the ram chamber l2. A roller member 28 may be mounted over the eccentric and separated therefrom by a bearing member 30.

Fig. 1, again blade 44 as A ram 32 is usually mounted in the ram chamber l2 and has a sliding fit within the tubular ram guide column M. It may be held against rotation by forming a V-shaped channel 34 in its exterior into which extends a wedge-shaped pin 35 through a. suitable opening in column M. The pin may be adjustab-ly mounted fora sliding fit in its channel through the threaded plug 38 moving in a correspondingly threaded portion of the opening.

At its upper end :the ram 32 is slotted to form a cross-head 40 to receive the eccentric 26 and its roller to provide a reciprocating motion to the ram upon rotation of the driven memberv 22.

The tubular column I4 is cut away on its inner portion as at 42 to afford visibility of the cutting parts to an operator and to afford an easy mounting for the cutting blade 44. For this last purpose the reciprocating ram is cut away or set back approximately 180 and recessed as at 46 .to receive .the cutting blade within the recess and centrally of the main body portion of the ram. The ram is apertu-red centrally above the recess and threaded interiorally to receive a correspondingly threaded limiting plug 48. This plug is adjusted inwardly or outwardly to fit tightly against :the top of blade 44 after the latter has been properly adjusted with respect to its die Is to prevent upward movement'of the blade with respect to the ram. For this purpose it may have a series of openings 49 for receiving a small pin for manipulation. The blade has an elongated slot 50 whereby it may be adjusted with respect to the ram and held in place by a set screw 52 extending through the slot into the ram. l

Opposite the cut-away portion 42 the tubular column extends outwardly as at 54 into a flange for supporting the foot member 6 and maybe formed integrally therewith or joined thereto through a pin 55 and bolts 56 as shown. This foot extends downwardly at an angle to the column I4 and rearwardly of the same, then around and forwardly to one side and below the best seen in Figs. 1 and 2.

A recess 58 is milled into the foot at right angles to the angle of its plane to receive the die member l8. The die may be adjusted vertically and horizontally in its recess through the vertical bolt 68 and the horizontal bolt 62 for proper cutting action with the blade 44. An elongated slot 6| in the foot below the recess permits bolt to to move toward or away from the blade 44.

With the structure thus far described, a narrow strip as it is being cut tends to curl downwardly and back upwardl against the work piece and may jam the cutting operation. Applicant therefore uses a deflecting or guide means interposed in the normal path of deflection of the cutoif material and adjacent the cutting means that restricts the amount Of deflection of the trimmed ofi portion causing it to pass ofi beneath the heel portion 54 and out of the Way.

Various means may be used for this purpose. The deflecting'means may be of most any desired shape. It is preferably associated with the forwardly extending portion of the foot [6 and extends outwardly therefrom below the cutting surface of the blade and die. It is so positioned with respect to them that as a portion liscut from a work piece it is deflected from'the normal or i expected curve given it through of the blade and die.

As shown, the deflecting means 64 consists of a stamping cut to fit below the die member 18 and to be held in place between the die and the botof the access by the clamping action of bolt 80. For this purpose the deflecting :means may be tanned with an outwardly extending blade portion 55 and :rearwardly extendin leg portions =53 aim-d6 :that pass on leit'herside of bolt 59.

"The -l'eg members may be made to fit snugly against the sides :of recess '58 to prevent turning of' the deflector while'the die i8 itself clamps the deflector securely in place against the 'bottOm of its recess through bolt 60.

Elf-he .deflector sbladefi :may be formed arcuately ior witha-icuryed contact edge t3 as more clearly shown "in Fig. 3 which tends to cause the strip being cut-101T to 'be diyergently cnrved away from The =icut edge :tending to Wedging action that may speed the cutting action ofitheishear.

The-deflector has been found advantageous in malcingcuts cemztrally through a work piece where the cutting action the tendency to curl and jam is lacking. The

hut-away portion however may 'be severely deflected at the out edge from the action of the :blade and not easily brought back into the plane of the main :body of the *workpiece. The deflector :64 considerably lessens the amount of de- :fle'o'tion and saves material in the trimmed-01f portion lthfi't might otherwise be treated as scrap. EEhe clteflector and its means of attachment herein shown :and described is but one -structure zforaccomplishing the desired result.

The invention may "be incorporated into varions-other embodiments and modifications apparout to those skilled in the "art without departing thetspi-rit or scope of -the invention.

I claim:

1. in a portable 'powerdriven hand tool of the type described having cutting means for shearing material from a :work piece and where the material being cut away is normally deflected beyond the plane of the main body of said-work piece *by the action of said cutting means, the

furnish a spreading or Ell 5 below said die member :said cutting means and extending into the path of the normally deflected material to restrict the amount of deflection oi said material.

The combination with a hand held portable power tool of the shear type having a stationary die mounted in -a recess of a supporting member and a reciprocating blade for cooperation with said die in shearing a work piece, of deflecting means mounted in said recess below said die and extending outwardly :from said supporting member to contact material trimmed from said work piece toguide it from its normal path.

4. The combination as defined in claim 3 wherein the die is aoljustably held within its re- .cess .by a bolt member and said-deflecting means has legs positioned on either side of said bolt member, said deflecting means being clamped into position between said die and the bottom of said recess.

:5. The combination as defined in claim 3 wherein said deflecting means has an arcuate curve in its outwardly extending portionto guide said material substantially Jlaterally away from the cut edge of said workpiece.

5. The combination with .a hand held portable power driven tool of the type described having a supporting member with .a stationary die membermounted therein, and-a movable cutting blade operatively cooperating with said die to cut a strip :of material from a work piece in which said material tends to curl out of the plane-of said material from the cutting action, of "deflecting means mounted on said supporting member and extending into the normal path of the curling strip of material to partially restrict the amount-of curl of said strip in the same general direction.

WILLIAM I-L GRAPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 784,978 Broadbooks Mar. 14, 1905 879,900 Potstada Feb. 25, ,1908

1,658,088 Kibler Feb. 7, 1928 1,922,846 Gray .Aug. 15, 1933

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