US2478935A - Gear-operated wrench - Google Patents

Description

Aug. 16, 1949- M. MoRrfz ETAL GEAR OPERATED WRENCH Filed may 27, 1944 Fig. I.

Max M orz'lz andffm'n Mdc/Gy Inventors Attorney l atented Aug. 16, 1949 icmanmeeaunmwxnuen Max llmr tzandlnv a Denver, aasr. signors toflhe'lj K. Sweeney Electrical Commay enverhQc Qt a ornorat c nf,.Qolmasl application-Wren, 194 cfi ri liia 531553 Jrlnis inventi nlrelat s t wrenches.-iand n r ticularly t =wreneheseiorauseaimlc atiocstwhexe thereiisrestricted r m- -.ft. frequently happens that mut o .be t rhn machinery -arevlocatedss rth tzi is dimcu tat emplgy iconrentienal wrenches e ufiic ent f l-ca taturnz-them. Eoracxam leaa ba trmgr h sollocatedtthat a :wrcne rhaviueia handl ssuim ciently long to provide the adequate leverage cannet hegengplgyed because of the length of its handlgjtgis z h n, diflicult to apply sufiicient force with a lever short enough to be used in the restricted spape. gecgendinglyi itiii an object of his invention. t ,nroyide .a wrenehhavinalan improved arrangement "for applying a dequate force to turn a machine element'locateddn a restrictedcspaee.

Another object of the inyention is to,,proy ide ani inrqved wrench of sirnnlaan r gged-con- ..structi njrfor app y a multinlied ettpamu built. or Qfiher'devicetdbe turned. 7 I I lEurth r ,o ie ts and advanta es willthea'apnarent'from the follow n idescripti aar dgth novels eatnr s ofth s' itiona b e ;rmiutc .out mthna a y the .c11aims ap ende to andforming a part of this specification.

For a better understanding of the invention reference may be had to the accompanying drawing in which,

Fig. 1 is a side elevation view, partly in section, of a wrench embodying the invention; and

Fig. 2 is a plan view of the wrench shown in Fig. 1.

As shown in the drawing the improved wrench comprises an elongated handle or bar 3 having a short shaft 4 journaled in an opening provided at one end of the shaft. An annular shoulder 5 is formed on the shaft and abuts the lower side of the bar 3, and a gear 6 is secured on the shaft on the opposite side of the bar. The gear may be secured rigidly to the shaft in any suitable manner, and has been illustrated as secured by a drive fit and held against rotation relative to the shaft by a key I. The shaft is provided with a shoulder 8 to act as a stop and determine the position of the gear on the shaft so that the distance between the shoulder 5 and gear 6 is slightly greater than the thickness of the bar 3, and the shaft can, therefore, rotate freely.

The lower end of the shaft 4, as indicated at 9, is formed as a stud of square cross section so that it can be detachably secured in non-rotative engagement with standard wrench sockets one of which is shown at Ill. The upper end of the shaft 4 is formed to provide a recess or septiqn a-tlia ais aa d ta e; Jae rtleteaauch assia lic tedta .a rdg aarine cadet. cuareaercs sscticn meme enn gve aatemtha h f Ame-tween. .emayqthu iba-emplg ed gy p aeigs 0 n thealcrige tak $i lfi -e -gaain ketwc tbastud; thsniho d nathfi ba statieaary ahileia nlitie c 9rc .tl1 al the lei en lite tu n theshafts rectlrin;manysloc ti nsammerer .i wi a r und thatlaalever 11.91

r mid et iee thtt ttur me esr ce e igascd .v cplse lll canno b 11cm EQQQLLL QQ:iQingpargfiuwg lmrsEQ r send t ensa fa ce anu t rlxiga amag emee a. rror qet which.inclcds ala mmdd:ratata lmecu dlw the basenals ad iiiaagdriamss au tathe. lhas iidfllfi' sf raledtnim-a rcu dlysa ll 'r n .aeshpiudeni landsissccur lnhmd iarlac lav-a .m nde k-wa's erfii 'llhasllall de l 1.1. suresireerct ticn ci' thetnin ac lapm hwa tregawdless'ei the? cf. mean -1. j-mhe ,xiinicais. rimmed ruith-ascclse anoriicn.h ting lasquar ls kcmltfermedfibersin radi te-later uchasaha-nr riaa iarililmamezdet chablr... cured'to drive -.lillhenfhgpini ui rotataibx heistic l bartbeing' held stationaryasby anchoring the same against a relatively fixed object, the force applied through the lever is multiplied because of the gear reduction ratio. Consequently a shorter lever may be employed for obtaining the same driving force as that of the longer lever necessary for direct drive of the shaft 4; the wrench may, therefore, be employed in more restricted locations. Obviously the wrench may also be employed under other circumstances requiring the application of a greater turning force; and the driving lever may be applied selectively to either of the sockets l I and 20 according to the force required.

During the operation of the wrench, the bar or handle 3 not only provides the bearings for the pinion and the gear but also acts as a member of the lever system in the application of the driving force, the driving bar l2 cooperating with the bar 3 to hold the pivot of the gear l5 against rotation about the shaft 4 to provide a fulcrum and thereby transmit the multiplied driving force to the shaft. Furthermore, the fact that the shaft may be turned by application of the driving bar at a point spaced from the shaft axis makes it possible to employ this Wrench in some restricted locations where the driving bar l2, regardless of its length, could not be applied dir ytcthc shaft, 7

From the foregoing it is apparent that this invention provides a rugged, simple and effective wrench for applying multiplied force to a device to be turned and which is particularly useful in locations where space is restricted.

Although a single embodiment of this invention has been illustrated and described, the invention is not limited to this construction and other arrangements will occur to those' skilled in the art, for example, the handle or body of the wrench need not necessarily be a straight bar; and it is intended by the appended claims to cover all modifications which fall within the spirit and scope of the invention.

What is claimed is: V I

1. A wrench comprising an elongated handle having an enlarged portion at one end, a circular opening through said enlarged portion adjacent the end of said handle, a. shaft rotatably mounted in said opening having a collar engaging the lower surface of said enlarged portion and a shoulder spaced above said collar, a noncircular projection extending downwardly from said shaft, a first gear fixedly mounted on the upper end of said shaft having positive rotation therewith and in engagement with said shoulder, the distance between said collar and said shoulder being slightly greater than the thickness of said handle to permit free rotation of said shaft and said gear, a second gear of a different size than said first gear rotatably mounted on a stud fixed to said handle in engagement with said first gear, said stud having a cylindrical portion forming a shoulder engaging said handle to permit free rotation of said second gear, identical coupling sockets on the upper end of said shaft and on the upper end of said second gear, and a lever having a head adjacent one end for detachably engaging either one of said sockets whereby a torque applied to said lever engaged with said socket on the upper end of said shaft will produce the same torque on said projection and the same torque applied to said lever in engagement with said second gear will produce a difierent torque on said projection.

2. A wrench comprising an elongated handle 4 having an enlarged portion at one end, a circular opening through said enlarged portion adjacent the end of said handle, a shaft rotatably mounted in said opening having a collar engaging the lower surface of said enlarged portion and a shoulder spaced above said collar, a noncircular projection extending downwardly from said shaft, 'a first gear fixedly held by a key on the upper end of said shaft having positive rotation therewith and in engagement with said shoulder, the distance between said collar and said shoulder being slightly greater than the thickness of said handle to permit free rotation of said shaft and said gear, a pinion gear rotatably mounted on a stud fixed to said handle in engagement with said first gear, said stud having a cylindrical portion forming a shoulder engaging said handle to permit free rotation of said pinion gear, identical coupling sockets on the upper end of said shaft and on the upper end of "said pinion gear, and a lever having a head adjacent one end for detachably engaging either one of said sockets whereby a torque applied to said lever engaged with said socket on the upper end of said shaft will produce the same torque on said projection and the same torque applied to said lever in engagement with said pinion gear will produce an increased torque on said projection.

MAX MORITZ.

IRWIN MACKAY.

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

UNITED sTaTns PATENTS Number

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