US1012552A - Driving mechanism for traction-engines. - Google Patents

Description

APPLICATION FILED APR. 16, 1911.

Patented Dec. 19, 1911.

3 BHEIZTS-BHEET 1.

1,012,552. Q 8&1

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H. A. HOWARD. DRIVING MECHANISM FOR TRACTION ENGINES.

, APPLICATION FILED APR.15,1911- 1,012,552.

Patented Dec. 19, 1911.

3 BHEETS SHBET 2.

H. A. HOWARD.

DRIVING MECHANISM FOR TRACTION ENGINES.

APPLICATION TILED APR. 15, 1011v 1,012,552. Patented Dec.19,1911.

3 SHEETS-SHEET 8.

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UNITED STATES PATENT OFFICE.

HENRY A. HOWARD, OF LLOYIDMINSTER, SASKATCHEWAN, CANADA.

DRIVING MECHANISM FOR TRACTION-ENGINES.

To all whom it may concern:

'Be it known that I, HENRY A. HOWARD, a subject of the King of Great Britain, residing at Lloydminster in the Province of Saskatchewan, Canada, have invented certain new and useful Improvements in Driving Mechanism for Traction-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same.

My invention has for its particular object the provision of an improved drivin mechanism for traction engines and simi ar machines, and to this end the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

.In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a fragmentary lan View showing the improved driving mechanism applied to a frame and rear axle of a traction engine; Fig. 2 is a side elevation of the mechanism shown in Fig.1, some of the parts being sec 'tioned; Fig. 3 is a detail in section taken approximately on the line m m of Fig. 2; Fig. 4 is a view in side elevation wlthsome parts broken away showing the constructions of the differential or compensating gear used in the improved driving mechanism; Fig. 5 is a section taken on the irregular line 00 m of Fig. 4; Fig. 6 is an enlarged View corresponding to Fig. 3; Fig. 7 is a fragmentary view in side elevation show ing ona larger scale than in Fig. 2 the ratchet mechanism of the improved drive; Fig. 8 is a detail in section on the line m w of Fig. 7, some parts being removed; and Fig. 9 is a fra mentary view in sectlon on the line mix- 0? Fig. 8.

The numeral 1 indicates a portion of theframework, the numeral 2 the divided rear axle, the numeral 3 the rear or traction wheels, and the numeral 4 the engine driven shaft of the traction engine, the said shaft being mounted in suitable bearings 1n the frame 1, and one of the said bearings being indicated at 5 in Figs. 1 and 2.

The compensating gear, hereemployed, in its act-ion 1s like that of one of the well known forms of compensating gears, and it comprises a pair of bevel gears 6, one keyed Specification of Letters Patent.

Application filed April 15, 1911.

Patented Dec. 19, 1911.

Serial No. 621,236.

to each of the sections ofthe rear axle 2 near the inner ends thereof. The driving member of the compensating gear is, however of novel form and it comprises a heavy rim 7 spokes 8, and a hub 9. The hub 9 is loosely journaled on the abutting ends of the axle sections 2 and the spokes 8 extend outward between the two beveled gears 6. Certain of the spokes 8 carry bevel pinions 10 suitably journaled thereto and meshing with the teeth of both of the bevel gears G. The rim 7 of the driving member or wheel is provided at both edges with external ratchet teeth 11 and with internal ratchet teeth '12. The internal and external ratchet teeth are reversely beveled so that they cooperate with driving dogs to rotate the said wheel or driving member in reverse directions.

Immediately pivoted on the hub of each gear 6 is an oscillatory driving lever 13. Each lever 13 carries a double ended reversible driving pawl or dog 14 which is pivoted thereto at 15. Vhen the outer ends of the driving dogs 14 are set for cooperation with the outer ratchet teeth of the wheel member 7, the said wheel, and hence, the rear axle 2 and traction wheels 3 will be rotated in a direction to drive the machine forward; but when the inner ends of the said driving dogs are set for cooperation with the inner ratchet teeth 12, the said traction wheels will be reversely driven, or in other words, will cause the machine or traction engine to move backward. For cooperation with each dog 14 there is a pronged shipper lever 16 pivoted to a notched segmental latch plate 17 carried by a cooperating lever 13. These levers 16 are provided with latches 18 that are engageable with the notches of the cooperating latch segments 17 to hold the said levers in either of two extreme positions. The prongs of the levers 16 are provided with light springs 19 that cotiperate with the dogs 14 to yieldingly hold the same, in the one instance, for engagement with the outer, and in the other instance for engagement with the inner ratchet teeth of the wheel rim 7.

The numeral 20 indicates a pair of segmental heads provided each with a pan of diverging arms 21 the ends of whlch are pivoted to the ends of the cooperating levers 13 so that the said heads 20 are free for lateral movements. In their segmental faces,

the heads 20 are provided with long openings 22 and on each side of said openmgs with toothed racks 23and 24:. The extremities of the slots 22 beyond the rack teeth 23 and 24 are approximately semicircular.

the extreme ends of the slots, they are fur-' ther providedwith teeth or lugs .27 Also,

each rack head is provided with alongitudinally and vertically extended lnwardly projecting segmental guide flange 28. The guide "flange 28 of each head cotiperates with the"- end portion 29 of a'guide arm or bracket 30,

both of which guide arms are rigid'ly secured to the framework 1.

The driving shaft 4 extends through the' slots 22 of both of the rack heads 211 and it is provided with two pinions .31.; One ofthese pinions 31 ooiiperates with the teeth of one of the rack heads and the other co'c'vperates'with the teeth of the other rack head. Secured to the drivingshaft 4; adjacent to each pinion 31 is ase'gme'ntal shifting flange? 32 provided with an intermediatenotch 33.

When the driving shaft 4 is rotated'the pin-.. ions 31; willb'e engaged alternately with theco6perating rack. teeth 23 and12tof the, re-" spective heads 20, and thus the said heads 20 and the levers and armsconnected- .'theret o' will/be oscillated but the arrangement is such that the two heads 20 will be 'simultaneously oscillated in reverse d rections so that thecOtSpera-tingdriVing dogs will be alternately thrown into actionon the toothed wheel rim 7 and continuous driving force thereby applied to the said drivlng wheel and through the latter and compensating gear the rear'a'xle and traction wheels,

'The manner in whichthe racks 23 and 24,

are alternately engaged withthe cotSp'erating'pinions 31is as follows: When one of the rack heads 20 reaches its extreme uppermost or lowermost position, the cooperatingpinion the said rack head. The said rack head will a be given a rigid lateral movement necessary to shift the one rackliead outof engagement I I into engagement with the sald plnion. The

lugs 25 and 26' cooperate with the extremities of the shifting head 32 after the manner of a segmental gear and hold the said seg- 7 'mentalheads against vertical movement while the racks are being-shifted, hen the y rack head is movedupward by engagement of one of the lugswith the cotiperating, pinion, the guide flange 28 of the said head'will pass on one sid'cof the end 29 of thecoiiperQ ating guide bracket 30 vand when the said rack head is moved. downward by engage-v ment of the otherrack with the said pinion,

the said'fiange28 will be soshifted by latvvith the said pinion and the other-rack eral movement of said head that it'will pass downward on the-otherside of the said end 29. In this way, the-said elements 28 and 29 serve to maintain engagement of the proper rack with the pinion .while the rack head is being moved from one extreme position to another, g

Through the driving mechanism .described, a relatively slow but relatively very great driving force is. transmitted from the driving shaft to the traction wheels and the compensating gear takes care of the diiierential movements of the traction wheels turning curves;

' TWliat I claim is z.

' 1. In a driving mechanism',the combination with a driving 'shaft 'and adriven shaft, ofa wheel connected tosaid driven shaft, a -vibratory lever, pawl and ratchet devices connecting said lever and said wheel, a rack head h aving an arm pivoted t'o-sa-idlever and provided in its outer facewith laterally "spacedracks a pinion on said driving shaft,

and means for shifting said rack'head to, alternately engage theracks thereof with said'pinion l 2. In a driving mechanism, thecombination with adriving shaftvand a driven shaft, of a wheel connected to said driven shaft, an oscillatory lever, pawl and r'at'chetfdevices connectingsaid wheel and said lever, 21 segmental rack'h ead provided'with an arm ')ivo.ted't-o said lever forlateral movements and having on its' segmental-face laterally latter at the extremities of its movement to thereby alternatelyengag'e the said racks withsaid pinion. x

3. In' a driving. mechanism, the combination with a driving-shaft and a driven shaft,

'ofa wheel connected to said driven shaft,

oscillatory 1evers, pawl and ratchet devices cdn'necting said w heel and said levers, segmental rack heads provided with armspiva' otally connected to respective levers for lateral movements. the said rack headsha'Yin-g laterally spaced racks, pinio-ns carried by said driving-shaft for-co'ciperation with the rack teeth of each rack head,--andcotiperatmg means carried by said shaft and by said rack heads for alternately shifting the racks of said heads into and out'of mesh with thecoeperatln'g pinions 1n reverse order.

4. In a'driving mechanis the combination' with a divided shaft, of a compensating gear connected to the section of said shaft and including a driving wheel havinga rim with internal and external ratchetteeth, an

oscillatory lever adjacent to said driving wheel, means for oscillatingsaid lever,'a 'reversible driving dog carried by said lever "for 'cotiperation, at will, .with either the -in-.

,ternal. or external ratchet teeth of said driving wheel, and means for setting said dog, at will, in either of its two operative positions.

5. In a driving mechanism, the combination with a driving shaft and a driven shaft, of a driving Wheel connected to said driven shaft and having reversely internal and external acting distinct sets of ratchet teeth, a lever provided with a reversible driving dog for action on either set of the ratchet teeth of said driving wheel, ar'ms pivotally attached to said lever, and means carried by said driving shaft and operative on said arms to oscillate the same both vertically and horizontally, substantially as described.

6. The combination with a drivingshaft and a driven shaft, of a driving wheel on said driving shaft, a lever, pawl and ratchet devices connecting said wheel and said lever,

a segmental rack head having an arm pivotally connected to said lever for limited lateral movements, and provided in its seg mental face with laterally spaced racks and with shifting lugs at the extremities of said racks, a pinion carried by said driving shaft, for cooperation with said racks, and a notched segmental head carried by said driving shaft and cooperating with the shifting lugs of said llGlCLiO move the said head laterally at the limits'of its movement and therebyalternately engage .the said racks with said pinion.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY A. HOlVARD. \Vitnesses BERNICE G. \VHEELER, HARRY D. KILGORE.

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