US2333892A - Shear - Google Patents

Description

Nov'. 9, 1943.

B. s cHuBER-r 42,333,892

SHEAR Filed April 24, 1942 2 Sheets-Sheet 1 5 T" I 'IW Il' o o F 5 2a f4 2 gg 50 f3 22: 7

Nov. 9, 1943. B. SCHUBERT SHEAR Filed April 24, 1942 2 Sheets-Sheet 2 Patented Nov. 9, 1943 v UNITED STATES -Y sniimf Baltasarschuberafcnieago; nil f` 'f l `minimaal Aprile; mi2,4 serial No.; 40311 screams.' (order-@41), y Y

.This invention relates to shears forcutting metal and other sheet materials and particularly such as arev capable of cutting along curved lines by swinging rthe shear or the work as the opera-l tion proceeds.V

vThe main objects of this invention are toproe vide an improved form of a multiple-purpose shear wherein the cutting blades are of .such form andso disposed as tooier a minmuxntof obstruction to the facility ofthe shear to follow. curved and,r angular lines; lto provide a shear .of this kind that may be rigidly supported for conf venience in the handling of light work that is ed to the shear; Ato providea shear of this kind that can be readily adapted to being guided on a piece of heavy work lying on a floor. or table; andV to provide a shear which can bepulled along instead of being pushed during its cutting operation, thus avoidingany situation inwhich `the point of cuttingis obstructed from View of the Operator... l

A further, object of the invention is Y to provide an improved formk of blade-carryingrarm or bed particularly adapted forma-king cuts within the area of a sheet without starting at a marginal edge of the sheet.

A specic embodiment of this invention is shown in the accompanying drawingsin which:

Figure 1 is a top plan of a multiple-purpose shear` designed for use as by attachment to a work bench or as a tool that is manipulated by the hands of the operator withrespect to a sheet lying on :the floor,

Fig. 2 is a sectional detail takenon the line 2-2 of Fig. 1, showing an appropriate structure for a( bracket for mountingv the device on la workbench. V Fig. 3 is a section tagen on Fig.l l,

Fig. 4 is a top view showing the sheanin relation'to av sheet of metal in which the cutting operation is commenced byinserting the nose of the une 3--3l of the lower shear blade through a smallholegin the sheet remote from the marginal edges thereof. Fig. 5 is a perspective viewyof the member thatA serves as a bed plate vand as a supporting frame for the operating mechanism.

' Fig. 6 is a section taken onthe line 6-.-6 of v Fig. 5.

Fig. 7 is an elevation of the member shownv in Fing. 5 showing thesame as Viewed from the right of Fig. 5.

For the purpose of the shear aDRrOPli'SQl limdrpower operation but it will illustration, the'design of either in a xed location shown in the drawings is one that is' be apparent that certain features ofA novelty; such as the-'peculiar relation ofthe cutting blades with` respect to their supporting devices is equally applicableto the use of 'mechanical power.'v

In the form shown inthe drawings, the devicev is designed for vcutting a 'horizontally disposed sheet of metal and comprises a lower cutter blade IV and-an upper cutter blade 2 that cooperate forl shearing the material. The'bottom blade I .iscarried by ai helicoidally warped U-shapedy bed member 3 which has a free siderv arm 4 that is tapered to a point and recessed to receive the lower-hard steel blade IV which is fastened by machine screws 5. -The iixed or body side arm I- of Athis U-shaped bed is rigidly and integrally connected to an upwardly and rearwardly curvedgooseneck frame 8 whichoverhangs the bosoml portion 9 of the U-shaped bed 3v and is apertured at I to receive the'fulcrum bolt II on whichis mounted the lever I2 that carries the uppery cutter blade 2. This lever is of U shape to provide a depending tongue "I2.I for supporting the blade and to conform with the insidieV vertical contour of the gooseneck 8 vso as to permit of maximum sweep of the sheet over the bed 3 and blade 2.'1

The novel helicoidally warped upper surface of the bed member l3 and the wedge-like sectional contour of this bed which tapers inwardly to" a thin edgueat the inner margin ofthe throat de fined by the U-shaped contour 'of the bed, as well' as the complete freedom of the pointed free arm 4 of the U-shaped bed lfrom any obstruction either above or below the bed, has greatly enhanced thev extent of'permissible relative turning of the sheet that is being worked'upon with respecttothef.,

cutting edges of the blades. Likewise, the tilting ofA the gooseneck and of the axis of thefulcrum, bolt II so that the cut is made at, an angle'to. the plane of the upper surface. of the lower blade I also contributes substantially to the s ameerd.,V The bed member 3 is-provided with a'horizontally extending lug I3 which is located remote from the cutter blade I and `on ythe otherrside: arm of the U-shaped bedA adjacent the base of the gooseneck. This lug I3 provides ameans forv rigidly mounting the device at the end` of arbeam; or arm I4 which is; horizontally disposedy andl rigidly attached to a bracket I5 provided with flanges I6, which may be bolted to aY bench or other rigid structure I'I. y; I

.A set screw I8 locksthe arm I4 in anyA desired position of adjustmentwith respect to the front edge. I9 of the bench. ThearmV Hf may' be pro-1 rldedn with, asooket. Il forv receirine the. lusy t3 into a hole and a set screw 2l for locking the vlug in the socket.

'I'he bed member 3 is also provided with a Vsecond lug 22 to which is attached a lever armv 23 which is similarly socketed vand provided with a set screw 24 for securing it to its lug.

In the form shown the gooseneck or frame arm 8 is provided with a sector of gear teeth 25 disposed in an arc concentric with the fulcrum apertures It and shaped to mesh with a pinion sector 21 that is journaled on a bolt 28 carried `by the lever I2.` The pinion 21 is rigidly mounted on a lever arm 29 which provides the powerl for this hand-operated tool.

A link`30 connects the bolts Il and 28 on the side of the gooseneck 8 that is away from the lever I2 and thus balances the strain on theV bolts Il and 28.

In operation, when the device is mounted on a bench by means of the brackety I and arm I4, it

is located a'considerable distance away fromsthej rearwardly arched gooseneck frame member rigid on the other side karm of said bed and carrying a fulcrum for said lever located above and rearward of said blades, and an arm for supporting said bed located on the side arm of said bed that is remote from the sideA arm that carries said lower blade, said bed supporting arm extending away from said bed in a location generally above the level of the .bottom of said bed, whereby no part of the shear is positioned to interfere with the free movement beneath said bed of work material acted upon by said shear.

2. A shear comprising .upper and lower cutter blades, a horizontally disposed u-shaped bed llav-v than can conveniently be manipulated by the-operrator in the elevated position of the device when it is connected with the work bench, the shear can beremoved from the beam I4 by releasing ,the set screw -2I and ,withdrawing the lug I3 and then, handling and operating the d eviceas an ordinary hand shear by means of the lever arms 23 andY 28. l There is considerable advantage inv the manipulationof the tool throughv the factthat the lever arms 23 and 29'extend forwardly from the cutter blades instead of rearwardly as is customarydwith, shears.Y vThis enables the operator -to guide the tol ,byV pulling it along by rneanslof the handles 23 and 29 insteadY of thrusting it along and ening one side arm carrying said lower blade, a le- -ver carrying said upper blade, an upwardlyand rearwardly varched gooseneck frame member rigid on the other sideV arm of said bedand carrying a fuicrurn for `said lever located 'above and reark Ward of' said blades, and an arm'for supporting said bed locatedon the side arm ofsaidbed that is remote from saidf'lower blade, lsaid supporting arm'extending horizontally away from said bed in a location generally above the level of thebote ytom of said bed, whereby no part of the shear is positioned tointerfere with the free movement beneath saidbed of work saidshear.`v Y i l Y .3. A .shear comprising upperv and lower cutter material acted upon by blades, a U-shapedA bed carrying said lower blade,

a lever carryingsaid upper bladeand iulcmmed above` the bosom of said U-shaped bed, a gooseneck rigid on said bed at apolnt remote fromits bladecarryirlg arm'andrproviding a support for said flilcrum, an operating `handle associated with said .lever,-and a handlerigidly xedon the side arm of the bed.v that is remotev vfrom its blade-carrying2ai-`m',lsaid hxed handle extending generally .horizontally `from said bed.

.l 4. A shear comprising upper and lowerl cutter blades, a U-shaped bed carrying said loweriblade on one arm of the U, a lever carrying'- said upper ables him to clearlysee 'the cutting .edge of the upper blade 2 for accurate guiding thereof when cuttingalong guide lines onV the material. By reason Vof" this better visibility,.it is possible to employ longerhandle arms 23 and 29. and use hand power on heavier material. n

When the device is mounted on the work bench, as shown inFig.V 1 Vthe handle 23 is unnecessary and may be removed if'it is found to interfere vvitlithevvork.V Y Oneof the principal'advantages of this con-- struction isrthe possibility-of inserting one blade punched in the sheet'and cutting along any desired path; thus making it possible; to'cut holesof any shape in the sheetwithout having4 the cuts run tothe which is'necessary if inside a shear of usual form. Y

Although but one rspecific embodiment of the invention is herein shown and described; it'V will be understood that numerous details'of the device holes are vto be cut by shown may be altered-or omitted-without departmargin of the' sheet f in 'their tomA of said bed on all sides of the blade and fulcrumed above the bosom 'of said U- sliapedbed'a gooseneck rigidfon theotherarm* of the U of saidbed ata point 'remote from said lower blade and providing a support for said fulcruln, and meansproviding-apail' of cooperating handlesi respectively associated with -said lever end the emi: dfseidlbed thatls remetefrom the arm that-carries said lowerblade, said both extending inv the general directionl that said y blades-extend awa'yfrom the bosom part of said U-shapeu bed, whereby the blades maybe guided cutting operation Vby 'pulling on said handlese-llfv l.-

.e l f r 15. A shear comprlsingrupper and lower cutter blades, a U-shaped bed havingone side armcar rying said lower bladefaleveroarrying said Vup-A per blade and fulcrumed above the bosom of said U-shaped'bed, -a gooseneck rigid on said bedv atr afpoint remote-from said bosom and from the side erm erniebed thatearrieseaid lower blade and.

providinga' support'forf'said fulcrum overhanging the besoin...portion oil' said b'ed, anda supporting arm rigidion said' bed 'at a-v point adjacent* said gooseneck 'and remote' from 4the lower blade carrying side arm and said bed,'said.supporting armbeing located and shaped to' extend generally above the bottornoi 'said .bed tof provide a substantiallylunobstructed path for movement i of a sheeftv of work mate from the cutter blades across and beyond lthebot BALTASAR sonmannr.

providing the sole support for

Images