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Publication numberUS917319 A
Publication typeGrant
Publication dateApr 6, 1909
Filing dateMay 1, 1907
Priority dateMay 1, 1907
Publication numberUS 917319 A, US 917319A, US-A-917319, US917319 A, US917319A
InventorsGeorge O Leopold
Original AssigneeNorth Bros Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 917319 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Patentedi Apr. 6, 1909.


6 f 7% n w G? D n w 5 a 6. 5 5 f j um r 0m qr n A y 5 n m w RU G. w? 7g 3; o f y i J 56mg (jlcopcgld M I mrnm GEORGE O. LEOPOLD, OF PHILADELPHIA, BENNSYLVANIA, ASSIGNOR TO NORTH BROS MFfi.



Specification bf Letters Patent.

Patented- April 6, woe.

To all whom it may concern:

' Be it known that I, GEORGE O. LEoPoLD,

a citizen ofv the United States, residing in Philadel hia, Pennsylvania, have invented certain? which the ollo'wing is a specification.

The object of my invention is to provide a breast drill with means whereby the speed of v{the drill can be readily changed and the dell) vice employed at will as either a right or a illustrating 'iny invention; Fig. 2, is a verti-' cal section on the line 22, Fig. 1; Fig. 3, is a perspective view of the change speed mechanism; Fig. 4, is a perspective View of parts of the mechanism for changing the character of the movement imparted to the '30 drill; Figs. 5, 6, 7 and 8, are diagrammatic views-illustrating the pawls shifted to diiier ent positions, and Figs. 9 and 10, are elevations illustrating modifications of the invention.

In the above drawings, A is the frame of the breastdrill, having a breast plate a and a hearing -A. This hearing has two arms (L -a between which is located the mechanism B for changing the character of the movement of the spindle. Projecting from one side of the bearing A is a handle C and on the bearing itself is a spindle a on which is mounted a beveled gear. wheel D held in place by a screw a. In the present in v stance, the hub d of the gear wheel D is grooved for the reception of the forked portion dof the crank arm D which has a haildle D as is common in this type of drill.

The spindle of the drill is indicated atE as passing through the bearing A and extend- "ihg into a step bearin a in the stock portion of the frame A; it eing provided with a groove 0 into which extends aconfining screw 0 so that said spindle is prevented in rovements in BreastDrills, of-

' from moving longitudinally in itsbearings, while beinghowe ver, free to rotate. Mounted on the spindle E are two sleeves F and G both snugly fitting the bearing A and servspindle. Y

A beveled pinion H having a hub h, is loosely mounted on the upper portion of the spindle E and meshes with the teethd at th periphery of the gear wheel D, while a sec- 0nd beveled pinion I is loosely mounted on the lower end of the spindle E, and also meshes with said teeth (1 of the Wheel D. A beveled pinion J loosely carried on the sleeve F meshes'with a second set of teeth (i on the wheel D; these teeth being nearer the center .of said wheel than the teeth d, as clearly shown in. the drawings. Either of the pinions I and J can be thrown into and out of operative connection with the spindle E, thereby either disconnecting it from the ,;the spindle asdesired. 1 Referring to Figs. 2 and 3, it will be noted that the sleeve F is enlarged at F and has an "annular groove f in the enlargement. Fit ting in this groove is a shifting plate n'bev- ,eled and notched at n and n Two bolts f and f 2 are constructed to fit into suitable grooves in the part F and at one end of each. bolt is a spring f 3 acting between it and a pin f in the groove in which such bolt is mounttion of the plate 11. and has one wall beveled, as shown, so as to conform to the bevels 'n, n of the plate n. i

The beveled pinion J, which is mounted on the hub of the sleeve F, has a series of openings 7' into which the bolt f 2 can be forced by its spring when the notched plate nis shifted into one position, and the beveled pinion I which is mounted on the spindle E at the end of the sleeve F, has a series of holes 1', into which can be projected the end of the bolt f The plate n is held to a sleeve N by a screw it and this sleeve is roughened so that it can be readily grasped and turned by hand.

.When the sleeve N with the platen is turned to the extreme right position the bolt f is projected under the action of its sprin into one of the holes of the beveled pinion and as this beveled pinion meshes with the teeth the wheel D, the sleeve F will be driven at a driving mechanism or varying the speed of ed. Each bolt is notched at'ffor the recep d which are nearer the center of rotation of ing to reinforce while being fixed to said slot speed. l i hco the sleeve N and its plate at moved to the left, then the bolt f is Withdrawn and the limlt f is allowed to be projected into one of the holes '11 in the pinion l, and as this pinion meshes with the teeth (Z on the periphery of the wheel 1D, the sleeve F will be driven. at high speed.

i t will be noticed that the sleeve F is loose upon the spindle ll] end is coupled to the spindle through mechenisn'i for changing; the

character of the drive as illustrated. in Figs. 4'

to S inclusive.

The sleeve G is secured to the spindle E] by transverse pin c, Fig. 2, being placed be tween the pinion iii and the sleeve F and having a number of longitudinal slots as shown in Fig. t On 'G-YKl oi the hub h of said pinion H are e series of teeth It, whi e on the upper end of the sleeve F a1; '21. second series of teeth f, there being pawls s and 8 operating in. the slots g and so to be capable of engaging the teethf end a pawl in the slot capable of the teeth 72 The two pewls c and s oppositely beveled While the pawl s is also beveled as shown best in Fig. In the sleeve G 'is an annular groove g" iii which rests o slide plate S notched shown in Fif l, and in the diagrams 5 to 8 inclusive, the pewls being grooved to receive this notched plate. in each one of the longitudinal grooves g, g, g is a spring which sets upon its particular pawl so to force it into engagement with its teeth when it is, released by the plate 65.

lnclosing the space between the hearing A and the beveled pinion H a casing K provided with a. slot .Z': through which projects a shifter s". This shifter is connected. to the plate so thet when moved to either. of its four positions, as ittllcittd in Fig. i, it moves said plate and sh -ts the pawls.

The marks indicate n Fig. 1 on the casing T 11, reading from left to right, are la. Rf, meaning left ratchet, which indicates the;

ween the shifter is opposite it, the peWls ere mechanism is positively to the driving mechanism,

so that the device o ates as an ordinary breast elm. '1). means thet the aWls are so t on the reciprocation of the driven mecl1enimpulses'in t..-e' continuous moons that the drivingm i ism. will pod. will move return.

to Figs. 5 to 8 inclusive. which SllOW the peWls in their different positions, Fig. 5 illustrates the plate S shifted to the ex treine left bend position, the pawl 3 being the only one projected, so that the driven ts in such a positionems spindle will be moved positively to the left, but will ratchet to the right. lb V 6, both pewlse and c are proi eeted one iepewl s is retracted, so that the driven mechanism is locked to the driv'h'ig mechanism and the driving mechanism is driven positively es in the ordinary breast drill v In 7, is shown the ol. to 8 so shilte he to retract the pawl s and allow the pewls t and s to be projected, with the result that on the reciprocation ol' the driving mechanism, the driven mechanism is given. a continuous forward movement. in 8, .l' have shown the plate moved to the extreme right hood position in which the pawl s is projected and the pewls s and s retracted, so that the driven. spindle will be positively moved forwerd to the right and ratchet to the left. Thus, by manipulating the two shifting plates at S, 3. cm enabled to make procticolly four changes of movement wit one end tour changes of movement with another speed. Moreover, arrangement is such as to produce e very compact breast drill, Which will. meet all the requirements, While being so simple in construction that it can be manufactured at a price within the means of an ordinary mechanic.

In some instances it may make a breast d ill Without using means for changing the character of the n1ovement,and in this cese l employ the speed cllap 'e gear illustrated in Fig. 9. I may also malls a. breast drill, as shown in Fig. 10, with onlythree changes of speed instead of four, in such case leoving otl either the right or left ratchet, as, in some instances, it may not be necessary to'providc a pawl with all the change mechanism. 1 prefor however, it p 'acticable; to use the mechenism illustrated inFig. 1. Further, in some cases it may be desirable to make the drill without the change speed mechanism, and it is to be understood that such a structure would be included as one form of my invention.

it will be noticed that by the construction illustrated I am enabled to make it very practical tool, for the spindle, While being comparatively light, is suitably protected from side strains by the sleeves F and G which each have a. portion mounted in the bearing A. Moreover, with the construc-- tion described, I provide a very firm and rigid tool which at some time is not cum.- bersome.

1. The combination ipfa breast drill, of a frame, a spindle mounted the "frame, a. stud oi: the frame, a. driving; gear heel mounted on. the stud, speed casings means, and means for altering the cherectero'l the movement oi the driven element, both of said means being mounted on. the spindle, with gearing between said means and the driving gear, substantially as described.

The combination in a. breast drill, of o ems-1e the h'amesaid pinion'meshing with the driv ing gear, a sleeve loose on the spindle and mounted below the iixed sleeve, a pinion on the hub of said sleeve and another pinion mounted on the spindle below the sleeve, both pinions meshing with the teeth on the driving gear, pawls carried by thesleeve sccured to the spindle, means for operating the pawls, and bolts secured to the sleeve loose on the spindle,- with means for operating the bolts, said parts beingso arranged'that by operating the bolts the speed of the drill can be changed, and by shifting the pawls the character of the movement of said drill can be altered, substantiall as described.

8. The combination in a breast drill of a frame, a breast plate carried by the upper portion of the frame, a bearing mounted on the lower portion of the frame, a stud projecting from one side of the bearing, a beveled driving gear mounted on the stud, a handle for driving the gear, a spindle mount ed in the body portion and extending from the bearing at right angles to the stud, a

sleeve mounted in a part of the bearing and secured to the spindle, a second sleeve loose on the spindle and extending into the bearing, with gearing between the sleeve and the driving gear, pawls carried by the fixed sleeve and bolts carried. by the loose sleeve,

with means for shifting the pawls and bolts, substantially as described;

4. The combination in a breast drill of a main frame having a bearing, a stud projecting from one side of the bearing, a driving gear whcel on the stud, a spindle mounted in the main frame and extending through the bearing, said spindle being free to turn in the frame, a fixed sleeve on the spindle extending partly into the bearing, a loosc'sleeve on the spindle below the fixed sleeve, and also ex.- tending into the bearing, a beveled pinion on the spindle at the end of the loose sleeve, another beveled pinion loose on the hub of the loose sleeve, a beveled pinion between the main frame and the fixed sleeve, said pinions meshing with the teeth on the driving gear wheel, teeth on. the hub of the loose sleeve and on the pinion between the fixed sleeve and the frame, pawls on the fixed sleeve arrangcd'to engage either the teeth of the pinlull orthosmof the sleeve, and bolts on the loose sleeve arranged to be shifted, the whole being constructed substantially as and for the purpose described.

The combination in a breast drill, of a frame having a bearing, a spindle mounted in the main portion of the frame and extending through the bearing, said spindle being pawls to va' free to rotate the frame, a sleeve fixed :to the spindle and mounted in the bearing, two pinions, a second sleeve loose on the spindle, a pawl, means for moving said. pawl to lock the loose sleeve to the fixed sleeve, means for operatively connecting either pinion to the loose sleeve, and a driving gear meshing with said pinions. I

6. The combination'in a breast drill, of a frame, a bearing on the frame, a spindle mounted on the frame, and extending through the bearing so as to be free to turn therein, a sleeve seoured-to the spindle entering the bearing, with three pawls on the sleeve, and mechanism cooperating with the both tires eed and the direction of rotation of the dn 1. I

7. The combination in a breast drill, of a main frame having a bearing, a handle pro jeoting from one side of the bearing, a stud" projecting from theother side of the bearin p a beveled di'iving'gear mounted on the stu a spindle situated in the main frame extending throu hthe bearing, a sleeve secureg to the spind e and entering the bearing, 0 driving devices, one above and one below? tlie sleeve on the spindle,.-both-of said drivin de? vices gearin with the driving gear, an the latter inclu ing a sl ve loose on the spindle, two pinipns, means for coupling either pinion to the said sleeve, and means or connecting either the first drivingdeviee or said loose sleeve to said sleeve secured to the shaft.

8. The combination in a breast drill, of a main frame having a bearing-a stud on'the bearing, a beveled driving ear mounted on the stud, a spindle mounts to turn freely in 1 belowt he fixed sleeve and having a portion also entering the bearing, means for retaining said latter s eeve in position, means for connecting said sleeve to the driving gear, pawls having beveled endsand mounted in thefixed sleeve, teeth'onthe loose sleeve, placed to be engaged by the pawls, springs for forcing the pawls outward, and a slide late mounted in ed sleeve and an annular recess in the notched so'asto retract or allow the pa'wls to project, substantially as described.

9. The combination in a ratchet drill, of a frame, a spindle free to rotate. in the frame, a sleeve loose on the spindle, a second sleeve fixed to the spindle and havin three longitudinal grooves, a pawl in eac groove, one of said pawls being arranped to be pro'ected in one direction'to cou e said two sleeves and the other two pawls Y eing arranged to be projected in the opposite dlrection, means co-acting with said two last pawls to change the character of the movement imparted to the spindle, a slide plate arranged to move in an annular groove in engagement with the pawls, and being notched to actuate the Cir same, with springs for moving the pawls in a direction opposite to that caused by the slide plate. I

10. The combination in a breast drill, of a frame having a bearing, a stud rejecting from one side of the bearing, a beveled driving gear mounted on the stud and having two sets of teeth, one within the other, a spindle mounted on the frame and extending through the bearing, two sleevesmounted. on the spindle and entering the bearing, one of said sleeves being secured to the spindle and the otherbeing loose thereon, a beveled pinion mounted between the fixed sleeve and the frame, a second pinion free to turn loosely on the loose sleeve, a third pinion mounted loosely on the spindle below theloose sleeve, the three pinions meshing with the teeth of the driving gear, pawls on the loose sleeve arranged to engage the two pinions on either end thereof, said sleeve having an annular recess, and a slide plate mounted in the recess and notched to actuate the pawls, so that either one or the other of the pawls is projected or both are withdrawn, pawls placed on the fixed sleeve, so as to he ca able of engaging the upper pinion and the oose through the other end thereof, a plate mounted. in the annular grooves and havin a series o1 notches on each side, a paw mounted 1n each longitudinal groove, springs tending to force the pawls outward, reversing means and change-speed mechanism ca able of being connected to the sleeve and t lence to the spindle through said pawls, with shifting means for the plate whereby the tool can be converted into a right hand ratchet, a locked drive, and a continuous forward feed ratchet, or a left hand ratchetf In testimony whereof,.1 have signed my name to this specification, in the presence of two subscribing witnesses.


Cooperative ClassificationB25B15/04