US1146992A - Starter for engines. - Google Patents

Description

`V. BENDIX'.4

STARTER FOR ENGINES. APPLlcATloN FILED lunsze. 1914.

Patented July 20, 1915.

3 SHEETS-SHEET I.

y- WLW Jaim JAM lcwa V. BENDIX. STARTER Fox ENGINES.

APPLICATIDN FILED JUNE 26, i914.

Patented July 20, 1915.

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, l nl l; y l In 1 Vl BENDIX.

STARTER FOR ENGINES. APPLICATION FILED luNEzs. 1914.

1,146,992. Patenbd July 20, 1915.

3 SHEETS-SHEET 3.

.STATES PATENT oEEICE. j

'VINCENT BENDIX, or' CHICAGO, ILLINOIS.;

S'IAE'IEN. Non ENGINES.

' Specilcation of Letters Patent.

Patented July 2 0, 1915.

Application led J' une 26, 1914. Serial No. 847,496.

To all lwhom it may concern.'

. Be it known that I, VINCENT BENDIX, a Vcitizen of the United States, residing at Chicago, in the countyof Cook' and State of Illinois, have invented certain new and useful Improvements in Starters for Engines, of which the following is a specification.

My invention relates to a starter for an engine such as a gas vengine and the object thereof is to provide a simple, elicient and .reliable device of this character operated by a prime mover of any ln'nd, such for instance as an electric motor. My starter is of that type having a screw shaft or the like operated by a prime mover either directly from the armature shaft orfindirectly by gearing and having mounted thereon a driving member in the form of a pinion adapted to be automatically Ameshed in the rotation of the screw shaft with some member of the engine and to be thereupon driven or'rotated for rotating such engine member.

The particular object of this invention is to improve the structure of a construction of this general type by the provision of the several advantageous features of -construction and mode of operation which will be apparent from the description hereinafter` glven.

In the drawings, Figure 1 is a sectional elevation of direct driven type of starter embodying my invention; Fig. 2 a detail view of the driving connection between the motor and screw shaft but on a smaller scale; Fig. 3 a cross-section on the line 3-3 of Fig. 1; Fig. 4 an end view of the pinion with the weight removed; Fig. 5 a cross-section similar to Fig..3 and illustrating the pinion cooperating therewith; Figs. 6 and 7 detail 'I- fdrive as shown-.in Fig. v1 and the other; an ,Y

views of the spring anchoring bolts and associatedparts; Fig. 8 a view similar tovFig. 1 but illustrating the indirect drive; Fig. 9 a detail section illustrating the driving connection between the driving shaft and the screw shaft; Figs. 10 and 11 detailviews similar to Fig. 9 but illustrating modified forms of driving connection. i

' In thedrawings, I vhave illustratedtwo different forms of drive froml the prime mover to the screw shaft, one being a direct indirect drive V4as fshown" in Figs. 8 .toC 11.

lI-Iowever, with. 'thisexceptionv the-general construction andithe, principle of operation are the same in bothinstances. y

-, Referring to the form ofstarter shown in travel.

Figs. 1 -and'2 the prime mover is here an electric motor 1 whose armature shaft is extended to form the driving shaft 2. This shaft is preferably tapered and is secured by means of a key 3 to a collar. 4, these parts being-held together by means of a'nut 5 screwing on the screw-threaded end of the armature shaft, Fig. 2. The collar whenA thus in place forms a component part of the driving shaft.

The screw shaft has two separate screwthreaded portions, to wit, an intermediate vportion 6, an louter end portion 7 and also an inner cylindrical portion 8 which is recessed to receive the smaller diameter of the providedbetween the collarl and the screw shaft, the same here comprising a spring 9 coiled around the cylindrical portion 8 of the screw shaft with one end'anchored to the collar and the othertosuch cylindrical portion by means of the two bolts 10 and 11 respectively. As shown the collar 4 and the cylinder portion 8 are in axial alinement and capable both of a relative rotary movement for driving purposes and also a slight longitudinal movement for av purpose hereinafter explained. Bypreference the anchoring bolts have lock washers 12 provided with lugs-13 on opposite sides, one of the lugs being adapted to be turned downwardly the first coil and the other being turned upwardly 'against one of the Hat sides of the head of the nut, Figs. 6 and 7. In this manner the bolts are locked against accidental rotation or loosening.

The driving member of the device is here shown as. a pinion 14 screw-threaded upon the threads 6 and adapted to coperatewith the driven member of the engine to be started such as a wheel 15 like the iy wheel of a gas engine. By preference this pinion is weighted by means of the depending weight 16 to insure the longitudinal movement of the pinion for automatic meshing purposes when the screw-shaft is rotated.

between the extreme end of the spring and By preference the intermediate portion of I the screw shafthas a plurality of separate threads instead of one continuous thread. InA the present instance there arethree of 'such separate'threads thereby providing a :las

-17 there being three of these shoulders and likewise theends of the thread which cooperate with these shoulders are terminated abruptly to form opposing shoulders 18.

The cutting of the threads is such that when the pimon reaches its inward limit'of travel all of the shoulders will contact simultaneously thereby providing a series of stops acting simultaneously and arranged equidistantly with respect to the circumference of the screw shaft. These Stops prevent any .possible binding of the pinion when it reaches its inward limit of travel. I do not, however, make any claim to this stop feature inthe present application as I have made it the subject-matter of a separate application. With respect to the outer end of the screw thread 6 it is unnecessary to provide any stops inasmuch as the engine wheel 15 when started on its own power will dislodge the pinion in case there should be any binding thereof. However, the plurality (preferably triple) threads shown herein provide a three-point bearing of the pinion against the thrust sleeve hereinafter described and centers it on the shaft.

Upon the outer screw-threaded portion 7 v of the screw shaft is secured a sleeve 19 provided with an end ange forming a thrust collar having a bearing in a bushing 20 which is secured in the bearing 21 provided v 1) 4 the electric motor has started whereupon the screw shaft is driven through themedium of the armature shaft 3, collar 4, and spring 9. Upon' the rotation of the screw .shaft .the pinion will be advanced to the right longitudinally of the screw shaft and intermesh with the engine wheel 15. When the pinion is in full mesh and itslongitudinal movement has been arrested by the collar 19 it will be rotated by the screw shaft and consequently the wheel 15 willvbe rotated. When the engine begins to run on its own power and the wheel 15 is thereupon A"rotated at an increased speed the pinion 14 will be automatically unmeshed by being moved to the left longitudinally of the screw shaft. After moving a slight distance away from the engine wheel after such unmeshing, the pinion will momentarily stop in its longitudinal Amovement and will rotate with the screw shaft. When the screw shaft has slowed down' somewhat the pinion will thereuponv movelongitudi-nally back to its normal or home position at which it is stopped by the contact of the respective shoulders 17 and 18.

In the event that in the longitudinal advance movement of the pinion 14 its teeth should not.register with the teethof the engine wheel the screw shaft is capable of yielding slightly toward the left, the clearance space between the collar 4 and the'cylinder portion 8 permitting of this endwise movement which is against the .tension of the spring 9. Owing to this arresting of kthe pinion the latter will start to turn and thereupon the teeth will be brought into register and a completeand proper meshing assured. This yielding of the screw shaft cushions the contact between the pinion and the engine member and prevents shock or jar of contact between said parts.

Referring to Figs. 8 and 9, there is shown the indirect drive for the screw shaft but the construction is otherwise substantially the samev and the corresponding parts will therefore be provided with the saine reference numerals. According to this construction the armature shaft 2 carries a driving pinion 23 meshing with a gear 24 which is secured by keying to a short shaft 25. This shaft has its bearing at one end in the inclosed casing 26 and at its other end in the recess'in the one end of the screw shaft. The spring 9 `in the present instance is anchored at its inner end to a pin 27 secured to the gear 24 but at its other end is anchored to the bolt 11 as in the other instance.

InFig. 10 I have shown a modified form as compared with Fig. 9 according to which the short shaft 25 is made integral with the screw shaft therebyappearingas an eXtension 28 thereof on which the gear 24 is loosely mounted. In this instance the drive is through the gear 24, pin 27, spring 9 and bolt 11 to the screw shaft. The extension portion 28 of the screw shaft has atelescoping fit in the driving member or gear 24 to permit of an endwise or longitudinal movement of the shaft. I

VIn Fig. 11 I have shown still another modification according to which the shaft 25 has keyed to it the gear 24 and is provided with a collar 29 separate `or integral therewith. This collar corresponds with collar 4 of Figs. 1 and 2 and the spring 9 is anchored thereto and .to the screw shaft by means of the bolts 10 and 11 respectively.4

1. A starter for engines comprising a shaft havinga solid screw-threaded section, a driving device which is screw threaded upon the shaft and adapted to travel longitudinally thereon and to engage a part of the engine to be driven, a driving member with which the shaft has a telescoping t,

'and a yielding driving connection between said driving member and said shaft. 2. A starter for engines comprising a shaft having a solid screw-threaded section, a driving device which is screw threaded upon the shaft and adapted to travel longitudinally thereon and to engage a part 3. A starter for engines comprising afshaft havingV al solid screw-threaded section, a driving device which is screw threaded upon the shaft `and adapted to travel longitudinally thereon andtoengagc a part of the engine to be driven, a driving member, the shaft having a longitudinalmovement and having a sliding fit with respect to the driving member, and a spring secured at one end to the shaft and coiled around an end thereof, the other end of the spring being secured to said driving member.

4. A starter for engines comprising a shaft' having a solidscrew-threaded section, a driving device which is screw threaded upon the shaft and adapted to travel longitudinally thereon and to` engage a part of the engine to be driven, a rotatable driving member with respect to which said shaft has a bearing and with respect to which it has a longitudinal sliding movement, and

. a yielding driving connection between said driving member and said shaft.

5. A starter for engines comprising a shaft having a solid screw-threaded section, a driving device which is screw threaded upon the shaft and adapted to travel longitudinally thereon and to engage a part of the engine to be driven, a driving member with whichthe shaft has a telescoping sliding fit, and a driving connection between said driving member and said shaft.

6. A starter for' engines comprising a screw-threaded shaft, a driving member which is screw-threaded upon the shafty and adapted to travel longitudinally thereon and to engage a part of the engine to be driven,l

a driving shaft, one of said shafts being recessedl at one end to receive an end of the othershaft, and a yielding driving connection between the two shafts.

' 7. A starter 'for engines comprising a screw-threaded' shaft having one oflits ends recessed, a driving member which is-screwthreaded upon the 'shaft and adapted to travel longitudinally thereon and to engage a part of the engine to be driven, a driving shaft entering the recess of the screw shaft,v

and a yielding the two shafts. f

8. A starter for engines `comprising a screw-threaded shaft having one of its ends driving connection between recessed, a driving member which is screw threaded upon the shaft and adapted to travel longitudinally thereon and to engage apart of the engine to be driven, a collar secured to one end -of the driving shaft and fitting into the recess of the screw shaft, andk a yielding driving connection between the collar and screw shaft. A

9. A starter for .engines comprising ascrew-threaded shaft having one of its ends recessed, a driving member which is screwthreaded upon the shaft and adapted to travel longitudinally` thereon and to engage a part of the engine to be driven, a collar secured to one end ofthe driving shaft and fitting into the recess ofthe screw shaft, and a yielding driving connection between the collar and screw shaft, consisting of a spring coiled around said inner end vof the screw 'shaft with one end anchored to the collar and the other end to the screw shaft.

-10. A starter for .engines comprising a screw-threaded shafthaving one of its ends recessed, a` driving memberwhich is screwthreaded upon the shaft and'adapted to travel longitudinally thereon and to engage a part of the engineto be driven, a collar secured to one end of the driving shaft and fitting into the recess A.of the screw shaft, and a yielding. driving connection between the collar and screw shaft, consisting of a spring coiled around the inner end of the screw shaft, and bolts which are secured to the collar and screw shaft respectively and to which the ends of chored. f

11..A starter for engines comprising a screw-threaded shaft, a Ldriving member screw-threaded thereon and' adapted to travel longitudinally thereon and to engage the'spring are ana part ofthe engine to be driven, a driving shaft, a yielding driving connection between thetwo shafts consisting of a spring coiled around onel end of the screw shaft, rotatable fastening members connected `.respectively with the ends of thel spring and with the two shafts for anchoring thereto the ends of thesprin'gs, and washers for said rotatable fastening members, each washer having two lugs', onejof which .engages between the end of the spring and the first coil and the other. of Awhich engages the fastening member itself to prevent rotation thereof.

- 12. A starter for engines comprising a screw-threaded shaft, a driving member which is screw-threaded upon the shaft and adapted toltravel longitudinallythereon and to engage a part of the engine to be driven,

a drivingshaft, anda yielding driving conl nection between the driving shatft' and screw-shaft, consisting of av spring coiled around the inner 4end of the screw shaft, bolts which are secured to the collar and screw shaft respectively and to which the ends of the spring are anchored, and a washer for one of the bolt's,'=such Washer having two lugs, one of which engages bep tween the end of the spring and -the first coil and the other of which engages the-bolt itself to prevent rotation thereof. s

13. A starten for engines comprising a screw threaded shaft, a driving member which is screw threaded thereupon and adapted to travel longitudinally thereon, a driving shaft, said two shafts being in alinement and telescoping at their adjacent ends and having longitudinal movement with re'4 spect to each other and a yielding driving connection between the twoshafts.

15. 'A starter for engines comprising a' screw threaded shaft, a driving, member which is screw. threaded thereupon and adapted to travel longitudinally thereon, a driving shaft, said two shafts being in alinement and telescoping at their adjacent ends and having longitudinal movement with respect to each other, and a spring connecting between the two shafts and constituting a yielding driving connection and also a resistance for said longitudinal movement.

16. A starter for` engines comprising a screw shaft consistingv of a screw threaded solid body portion and a recessed end portion, a driving member screw threaded upon the shaft and adapted to travel longitudinally thereon, \a driving shaft telescoping into said end portion of the screw shaft, and a -yielding driving connection between the driving shaft and the screw shaft:

17. A starter for engines comprising a screw shaft consisting of a screw threaded solid body portion and a recessed end portion,

a driving member screw threaded upon the shaft and adaptedito travel longitudinally thereon. a driving shaft telescoping into said end portion of the screw shaft, and the screw shaft having' a longitudinal movement with respect to the driving shaft, and a spring forming a. driving connection between the two shafts. l I

18. A starter for engines comprising a screw-threaded shaft havingone of its ends recessed. a driving member which is screwthreaded upon the shaft and adapted to travel longitudinally thereon and toengage a part of the engine to be driven, a driving shaft, a collar secured to one end of the driving shaft and fitting in to the recess of the screw s haftyanda yielding driving connection between the collar and screw shaft, the screw'sh-aft havinga longitudinal move ment withrespect tothe collar. l

19. A starter for. engines comprising a screw-threaded shaft having one of its ends.

recessed, a driving member which is screwthreaded upon the shaft and adapted to travel longitudinally thereon and to engage a partof the engine to be driven, `a driving shaft, a collar secured to lone end of the driving shaft' and yfitting into the recess of the screw shaft, and a yielding driving connection between the collar and screw shaft, consisting of a spring coiled around the inner end of the screw'shaft, the latter having a longitudinal movement with respect vto the collar, which movement is resisted by the spring.

20. A starter for engines comprising an electric motor including its armature shaft, a screw-threaded shaft having its inner end recessed to receive such armature shaft, a yielding driving connection between the two shafts, and a driving member screw-threaded onjthe screw shaft and adapted to engage a part of the engine to -bestarted.

21. A starter for engines comprising an electric motor including its armature shaft, a `collar secured to its outer end, a screw-v threaded shaft having its inner ,end recessed to receive such armature shaft, a yielding drlving connection between' the collar and screw shaft, and a driving member screwthreaded on the screw shaft and adapted to engage a part of the 4engine to be started.

22. A starter for engines comprising a ro'- tatable shaft separately screw-threaded as to its outer end and its intermediate portions, a driving member screw-threaded upon said intermediate portion and adapted to engage a part ofthe engine to be'st'arted, a casing for said shaft and provided with a bearing, a sleeve screwing onto the screw threads on. the outer end of the shaft and mounted in said bearing, and means for l driving the shaft.

23. A starter for engines comprising a ro' tatable shaft reversely screw threaded as to its intermediate portion and outer end, a

driving member screw-threaded upon said' intermediate portion and adapted'to engage a part of the engine to be started, a bearing, a sleeve screwing onto the end of the shaft and received by said bearing, and means for driving the shaft.

24. A starter for engines comprising a rotatable shaft reversely screw-threaded as to its intermediate portion and outer end, a driving member screw-threaded upon said intermediate portion and adapted to engage a part of the engine to be started, a bearing, a sleeve screwing onto the en d of the shaft and received by said bearing, and means for driving the shaft, said sleeve being flanged at one end and forming a thrust collar.'

25QA starter for engines comprising a ro,v

thelouter ends of such threads, and adrivingvmember screw-threaded upon said shaft and adapted to travel longitudinally thereon lWhen the shaftv is rotated and to Contact the ends of the threads and thereby be held centered When rotating with the shaft.

26. A starter for engines comprising a screw-threaded shaft, a driving member which is screw-threaded upon the shaft and adapted to travel longitudinally thereon and 10 to engage a part of the engine to be driven,

a driving shaft telescoping with the screw S. E. HIBBEN, ROBERT DOBBLEMAN.

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