US1460813A - Control mechanism of excavating machines or the like - Google Patents

Description

JuEy 3, 1923,-

I H. H. HARRES 1 CONTROL MECHANISM OF EXGAVATiNG MACHINES Filed March 21 1 9 OR THE LIKE 6 Sheets-Sheet l 7 H. H. HARRIS CONTROL MECHANISM OF EXCAVATING MACHINES OR THE LIKE Filed March 21 1919 6 Sheets-Sheet 2 H. H. HARRIS V CONTROL MECHANISM OF EXCAVATING MACHINES OR THE-LIKE Jufly 3, 1923.

Filed March 21, 1919 6 Sheets-Sheet 5 surfs, 1923. I 1,460,813

H H. HARRIS CONTROL MECHANISM Of EXCAVATING MACHINES OR THE LIKE Filed March 21 1919 6 Sheets-Shet 4 I I ,.-I- 1 I JVlZ/v 5M 5 09 (ML H. H. HARRIS CONTROL MECHANISM OF EXCAVATING MACHINES OR THE LIKE July 3, 1923.

Filed March 21 1919 6 Sheets-Sheet 5 Bria/av July3,1923.

HH HARRIS 4 CONTROL MECHANISM OF EXCAVAT ING MACHINES OR THE LIKE Filed March 21 .{11919 ITTI 6 Sheets-Sheet 6 Patented July 3, 1923 HOLLTS H. HARRIS, 0F LOBAIN, OHIO, ASSIGNOR TO THE THEW SHOVEL COMPANY, OF

LORAIN, OHIO, A CORPORATION OF OHIO.

CONTROL MECHANISM OF EXCAVATING MACHINES OR THE LE.

Application filed March 21, 1919. Serial No. 284,109.

To all whom it may concern:

Be it known that I', HOLLIS H. HARRIS, a citizen of the United States, residing at Lo rain, in the county of Lorain and btate of Ohio, have invented a certain new and useful Improvement in Control Mechanism of- Excavating Machines or the like, of which the following is a full, clear, and exact de scription, reference being had to the accompanying drawings. 1 This invention relates to an operating mechanism for devices such as excavating machines, including a cable drum adapted to be driven in one direction by a steam engine and to move in the other direction by pull on the cable, under the control of a brake. An object of the invention is to provide a simple, effective controlling mechanism adapted to be operated by a single manually controlled member. A more specific object is to so arrange this manually operable controlling member that it may start the engine, clutch the engine with the drum and cause the release of the brake, or reverse these operations and regulate the application of the brake. Another object includes the provision of a pressure fluid-controlled clutch between the engine and the drum. Another object is the construction of a brake for the drum which may automatically operate to resist movement of the drum in one direction of its rotation and automatically release in the other direction of movement of the drum. Still other objects will become apparent in the following description which relates to the drawings.

In the drawings, Fig. 1 is a side elevation of my operating mechanism; Fig. 2 is a plan of the drum and driving mechanism therefor, illustrating my controlling mecha nism connected therewith; Fig. 3 is a vertical section through rock arms and slides forming part of the controls mounted in a casing; Fig. 4 is a similar section showing a different position of the parts; Fig. 5 is a similar section showing still another position of the parts; Fig. 6 is a transverse section taken on a line indicated by the line 66 of Fig. 3; Fig. 7 is a view similar to Fig. 5 showing still another position of the parts of the slide controls; Fig. 8 is an enlarged detail of a lever shiftable from idle to operative position for controlling certain of the parts independently of the others and operable in connection with the slides shown in Figs. 4 to 7 inclusive; Fig. 9 is a section through a pressure fluid valve controlling the clutch Fig. 10 is a ,similar section showing the valve in another position; Fi 11 is a View of the gear carrying the clutc removed, illustrating the mountings for the clutch operating mechanism and counter:

weight therefor; Fig. 12 is a view in the nature of a section through a piston and cylinder forming a part of the clutch operating mechanism; Fig. 13 is an operating rock arm forming a part of this clutch. operating mechanism; Fig. 14 is a detail section a through a brake for the drum; Fig. 15 is a detail of one of the operating members for the brake; and Fig. 16 is a section on the line 16-16 in Fig. 14:.

Describing the parts by'the use of reference characters, 1 indicates a suitable motor or engine, preferably a steam engine, 2 the connecting rod driving a crank disk 3 on the,

shaft 4: on which is rigidly mounted a pin ion 5. driving a gear 8 journaled on a shaft 9 supporting a drum 10. The drum 10 is adapted to receive a cable or any suitable flexible member which may operate a scoop or bucket of an excavating device.

In the operation of such device as mentioned, it is desirable'to be able to release the brake, clutch the gear 8 to the shaft 9,

thus clutching the drum with the engine, and then start the engine, all by the use of a single lever movable through varying positions. The motion of the lever from neutral towards its extreme position in one direction clutches the drum with the engine and the successive positions of the lever start the engine and determine its speed. The movement of the lever back from this extreme position where the engine is running at its greatest speed, will first reduce the speed of the engine. and finally cut ofi' the At 12 is indicated a lever mounted on a rock shaft 14. A link 15 is shown as pivoted to the lever and to the upper end of a rock arm 16 on a shaft 18 journaled in a casing 19 mounted on a suitable bracket 20. In the upper end of the casing is a slide bar 22. This slide is operated by a finger on the rock shaft 18 having a curved upper surface and abrupt shoulders at either side adapted to engage a notch 23 in the slide, to accomplish certain desired movements consequent upon the operation of the lever 12. The slide 22 is shown as connected through a link 27 With a valve rod 28 for operatlng a slide valve 29 within a valve casing 30.

The valve is shown as a D-valve operating upon a flat valve surface 31 at the bottomcf the casing, the casing being provided with a removable cover 33. The rod 28 is shown as extending througha suitable stuffing box in the end wall of the casing while a pipe 36 leads to the opposite end wall for hve steam or other pressure fluid.

The valve 29 operates to control passages 37 and 38. The passage 38 leads to the pipe 40 connected with the casing and leading to a revoluble closed connection at 42 fitted to the pipe 43 axially positioned and carried on the end of the shaft 9 and forming communication through an axial passage to a radial passage 45. The pipe 45 leads to the inner end of a cylinder 46 whereby pressure may force a piston 47 (Fig. 12') in that cylinder outwardly. This piston, through a connecting rod 48, may operate a rock arm 50 on a rock shaft 52 carried by the gear wheel 8.

Rigid on the shaft 9, and preferably formed as enlargements of the drum 10, are drum surfaces 54 and 55 forming. respectively a brake drum and clutch drum. Surrounding the clutch drum surface 55 is a collapsible band 56 secured at one end to an oifset crank pin 58 on the rock shaft 52 journaled in a bearing 59 rigid with the gear 8, as illustrated in Fig.13. Theother end of the band is adjustably secured by a screw "60 to a pin 61 formed in a boss 62 on the gear 8, whereby the outward movement of the piston 47 tightens this band 56 on the drum surface 55 thereby causing the drum 10 to rotate with the gear 8. A spring 64 surrounds a guided rod 67 which leads through a stud 65, mounted on a boss 66 carried by the gear 8, and is pivoted to the lever 50. This spring acts under-compression to return the piston upon the release or 75 (Fig. 14) adapted to act upwardly on an adjustable shoulder block 77 secured to a brake bar 80. This bar is secured at 81 to one end of a collapsible brake band 82 surrounding the drum 54 rigid with the drum 10. The other end of the brake band 82 is pivotally connected at 84 with a link 85 (extending through a slot formedin an enlargement 86 of the brake bar 80)- having transverse projections 88 adapted to engage notches on each side of the enlargement 86.

,The projections 88 are carried on a slidable block 83 whereby they may be adjusted toward and away from the pivot84 by a nut 89 threaded onto the rod 85.

When the drum 10 is turning in a direction indicated by the arrow, Fig. 14, that is, to unwind the cable the brake is automatically applied in proportion to the amount of release or downward movement .of the member 80. As the arm 80 drops downwardly when moving with the brake band 82 on the drum 54, it passes the stop 90 and then moves tangentially to the stop whereby a continued downward movement contracts the brake band about the drum; whereas if the drum 54 were running in a direction opposite to that indicated by the arrow, the tendency for the drum would be to raise the arm 80 thus allowing the brake band to expand. Practice has demonstrated that this brake is very effective in its application with the drum running toward the arm 80. while in the opposite direction the friction caused by the brake is negligible.

It will be seen that the lowering of the cam or finger 75 may allow the application of the brake to varying degrees under the control of the lever 12, while raising the cam may resist the automatic application, and if entirely raised may relieve the brake irrespective of the direction of rotation of the brake drum whereas with the drum running in the direction opposite the arrow the brake is relieved irrespective of the position of the finger or cam 75.

The same lever 12 which controls the brake and clutch may operate any suitable throttle for the engine 1. As indicated in Figs. 1 and 2. the throttle (not shown) is operated by the rock shaft 92 which is shown as connected by a rock arm 93 with a link 94 leading forwardly and pivoted at 95 to the rock arm 96.

A more complete description of the mechanism thus tar described 1s as follows: As-

suming that the lever 12 is in the position shown in Fig. 1, the brake 82 on the drum 54 is applied. The clutch and 56 is release-Ll and the engine stationary. To start the device in a direction to wind the flexible member onto the drum 10. the lever 12 s drawn rearwardly. As stated. the link 91. is connected at 95 to a rock arm 96, and this cally relcase the brake as described.

arm is looselv journaled about the shaft 18 and is normally connected with and operated by the operation of the lever 12 through an actuating finger 100, rigid on the shaft 18, and similar to the finger 25 and adapted to act in a notch 101 in the under side of a slide 102 in the casing 19 and operable parallel with the slide 22 heretofore described. This slide 102 has an upwardly projecting boss 104 providing a notch adapted to receive a projection 105 at thelower end of a slid able extension arm 106 carried in a suitable guide formed on the rock arm 96.

Thus it will be seen that as the rock shaft is actuated the slide 22 operates the connections to the valve controlling the clutch be tween the drum 10 and. gear 8, while the slide 102 operates through the projection 105 on the lever 106 to operate the rock arm 96, in turn actuatingthe rod 94 and throttle mechanism. On the other hand the throttle may be operated independently of the other mechanism by raising the arm 106 so that its projection 105 clears the notched boss 104 on the slide 102.

Assuming that the parts are idle, to start the mechanism to cause the flexible member to wind onto the drum 10, the lever 1.2 is moved from the intermediate or upright position shown in Figs. 1. 2 and 3 rearwardly toward the engine. The first part of this movement brings the actuating finger 25 into operative contact with the shou der of the notch 23 in the slide 22 which through the link 27 and valve rod 28 actuates the valve 29 moving it from the position shown in Fig. 9 to that shown in Fig. 10, where upon live steam or similar pressure fluid may pass through the passage 38 and pipes 40. 43 and 45 to the cylinder 4.0 actuating the piston 47 to swing the rock shaft 52 in a direction to tighten the clutch band 50, thus connecting the gear 8 with the drum.

Further movement of the levcr 12 to the rear causes the finger 100 to engage the notch 101 in the slide 102. which through the projection 105 actuates the rock lever 100 to move the rod 04 operating the throttle and starting the engine. This same movement of the lever. moving the finger 75 downwardly out of the path of the brake applying member 80. docs not. however. ap-

ply the brake'bccausc the drum 54 and drum 10 are running in a direction to automati- The levcr 12 may be moved if desired through a considerable distance. varying the degree of opening of the throttle. and thus controlling the device while the parts are functioning as last stated.

The upper surfaces of the lingers and 100 are so shaped that they pass idly out of the notches after the complete movcincnt of the slides in either direction accomplished. Thus as the lever moves from the position shown in Fig. 1 to that in Fig. 5, the finger 25, having completed the opening of the valve and the consequent application of the clutch, passes idly out of the notch, 'as does the finger 100 after the throttle is completely open, any further movement of the lever 12 in a rearward direction being idle. The returning forward movement of the lever 12 through a considerable angular distance may regulate the throttle before the finger 25 is brought to an active position to move the slide and valve controlling the clutch. Return to the neutral position, however, releases the clutch. In any of the positions of the lever to the rear of the vertical. the finger 75 is out of engagement with the arm 80. The brake is automatically applied immediately upon the stopping of, the movement of the drum in a direction to release the. brake, since downward movement of the bar 80 and consequent contraction of the brake band 82 is then permitted, and any load on the drum acts in the direction of the arrow in Fig. 14 to increase the braking effect as hereinbeforev explained.

Movement of the lever 12 to the,.left in Figs. 1 and 3, or forwardly as illustrated in Fig. 7, causes the fingers 25 and 100 to passv idly out of thanotches, while engaging the edges of the notches at the arcuate outer surfaces, thus preventing inadvertent movement of the slides. This forward movement of the lever shoves rearwardly on the link 71 actuating the rock shaft 74 in a direction to raise the finger 75 which as stated releases the brake. If, therefore, a flexible member is drawing on the drum tending to rotate it in the direction of the arrow in Fig. 14, the brake tends to automatically apply itself and the actuating finger 75 may relieve this brake, the braking action varying in degree as desired, according to the position of the lever 12, thus controlling the speed of the drum. A lateral extension 76 on the block 7 7 may limit the downward movement of the arm 80 by engaging the stop 90.

Thus for all ordinary operations of the mechanism, the device is controlled and regulated by movement of the lever 12. If, however. it is desired to operate the engine independently of the position of the other parts of the device-irrespective of whether the clutch is active or inactive and whether the brake is on or oti'-this may be accomplished by merely raising. the extension arm 106 out of engagement with its slide 102 and holding it so raised for temporary operation as desired.

Having thus described my invention, what I claim is: I

1. The combinations with a throttle controlled engine of an operating member driven thereby, a friction clutch between &

the engine and the operating member,

ing member, an automatic one-way brake and a clutch for said member, a manually operable controlling member; and connections leading from said controlling memher to the brake and to the throttle of the engine, whereby movement of the manually operable member in one direction from a neutral point actuates the clutch and en-. gine throttle in successive operation, said connections comprising a member having a recess therein and a finger cooperating with a wall of said recess, said brake being antomatically released when power is applied, and automatically locked when power is shut oil, the power being shut ofi and the clutch released successively when the member is moved backwardly toward the neutral point, and mechanism associated with the brake whereby continued backward movement of the lever beyond a neutral point effects the gradual release of the brake.

3. In a device of the character described, the combination of an engine, a rotating member driven thereby, a clutch between said member and the engine, an automatic one-Way brake for said member, a lever, connections between the lever and the clutch to definitely control the clutch by the position of the lever on one side of an intermediate point, and connections including a slidable member having a shoulder and a cooperating finger between said lever and the brake whereby movement of the lever on the other side of said intermediate point definitely controls and gradually releases the brake as the lever is moved away from I the intermediate point.

-l.Tl1e combination of a throttle controlled engine, a drum driven thereby. a clutch. between the engine and the drum, an automatic one-way brake tor the drum, the brake being automatically released upon ,winding in of the drum, and automatically looked upon paying out of the drum, a single manually operable controlling member adapted to be moved in one direction from the neutral point. and connections associated with said member including a slide and a segmental finger cooperating therewith whereby movement oi said member applies the clutch and throttle successively.

5. in a device of the (fllill'fll'l'Ol' described, the combination, with an engine, of a roneeojeis tat able member, gearing connecting the ensaid gearing for applying the clutch, pressure fluid mechanism operatively connected with said cylinder, a valve controlling such pressure fluid, an operating lever, connections between said lever and said valve adapted to ow ate the valve in one range of movement of the lever and be idle through another range, a brake adapted when in operative position to prevent retrograde motion of the rotatable member, connections between said lever and brake whereby the lever maintains the brake in operative position when the lever is in position to actuate the clutch, whereby retrograde motion of the drum in the case of failure of power, or insuflicient power, is prevented.

6. In a device of the character described, the combination with a throttle controlled engine, of a rotatable operating member, gearing connecting the engine and operating member, a clutch having one element mounted within and revoluble with the gearing, an operating lever, connections between said lever and said clutch, additional connections between said lever and throttle of the engine, whereby the position of the lever determines the position of the clutch and throttle, and means whereby the throttle may be controlled independently of said clutch.

7. In a device of the character described. the combination, with a throttle controlled engine, of a rotatable operating member, gearing connecting the engine and operating member, a clutch having one element carried by said gearing. a cylinilcr, a piston therein for operating the clutch, said cylinder and piston being rotatable with said gearing, a passage leading to the cylinder. a valve controlling said passage. means for operating the valve including a lost motion connection, means for operating the en gine throttle, a lever connected witlrezu-b of said means adapted to operate them through ditl'crent zones of movement. and

means for separating the throttle control from said lever to allow independent actuation oi the throttle.

8. T he combination of a throttle controlled enginc, a drum driven thereby, a pressure fluid operated friction clutch betweenthe engine and the drum, a brake tending to automatically resist movement of the drum in one direction and be idle in the other direction, and a single controlling means adapted to be moved in one direction from a neutral position to operate the clutch and throttle and in the other direction from the neutral pOSltlOll to release the brake, and means whereby the throttle may be ope atcd independently of said controlling means.

9. lo a device oi the character described, the combination, with an engine, an operice ill"

ating drum driven thereby, and a clutch mechanism between the drum and engine including a gear adjacent the drum, a cylinder and piston mounted .to revolve about the axis of the drum, a connection between the piston and the clutch, a passage leading to the cylinder, a valve in said passage, a sliding member for operating said valve andhaving a shoulder thereon, an operating 'finger adapted to engage said shoulder and having an arcuate surface, whereby the slide may be moved by the finger) and held against return movement by the areuate surface, said surface being adapted to move outwardly in the slot to prevent further operation of the slide. v

10. In a device of the character described, the combination with an engine, an operating drum driven thereby, and a clutch mechanism between the drum and engine, pressure fluid means for operating the clutch, including a valve, a sliding member for operatingsaid valve, and havin a shoulder thereon, an operating finger a apted to engage said shoulder and having an arcuate surface whereby the slide may be moved by the finger and held against return movement by the arcuate surface.

11. In a device of the character-described,

the combination, with a throttle controlled engine, of a drum for'a flexible member, gearing connecting the engine and drum ineluding a clutch, said cluteh'comprising an expansible member and a drum, a cylinder and piston therein mounted to revolve about the axis of the drum, a connection between the piston and the-expansible ,member for operating the clutch, a passage leading to the cylinder including a passage axial of the drum, a valve in said passage, and a manually operable means for successively operating said valve and for operating the throttle, said means being arranged to permit operation of the throttle independently of the valve. y

12. In a deviceof the character described, the combination, with a throttle controlled engine, of an operating member, gearing connecting the engine with the operating member including a clutch, pressure fluid operated means for actuating the clutch, a valve controlling the operation of said means, a. slide connected with the valve and having spaced shoulders, an operating member adapted to engage said shoulders, a rock shaft on which said last named member is mounted, said operating member being adapted to actively engage said shoulders for certain parts of the movement. of the rock shaft and to idly abut the shoulders during other parts of the movement of the rock shaft, manually movable means for operating the rock shaft, and a connection leading from said manually movable means to the throttle.

13. In a device of the character described, the combination, with a throttle controlled engine, of an operating member and gearing connecting the engine with the operating member including'a clutch, a slide for o crating the clutch and having spaced sho ders, a rock arm adapted to engage said shoulders, a rock shaft on which said arm is mounted, said arm being adapted to actively engage said shoulders for certain parts of the movementof the rock shaft and to idly abut either shoulder during other parts of the movement of the rock shaft, manually movable means for operating the rock shaft,

and a connection leading from said means t0 the throttle.

.1 4. In a device of the character described, the combination, with an engine, of an op-' erating drum, gearing connecting the drum and engine including a clutch, means for operating said clutch including a slide, a rock shaft, a connection between the rock shaft and slide in the form of a rock arm, said slide having shoulders adapted to be engaged by said arm, a lever for operating,

the rock shaft, an adjacent slide, a second rock arm, a connection between said second rock arm and the engine, and a disengageable connection between said last named rock arm and second named slide, whereby movement of said rock shaft may control the clutch and the engine.

' 15. In a device of the character described, the combination, with an engine, of an operating drum, gearing connecting the drum and engine including a clutch, a rock shaft, a projection carried thereby, a slide having shoulders adapted to be engaged by the projection to move the slide, means connecting the slide and clutch, a lever for operating 1 matically applied upon? one direction of movement of the drum and to be released upon movement in the'opposite direction, and a manually movable controlling member adapted to control the engine throttle and release the brake in different zones of mov'ement. the throttle having a separable connection with said member, whereby the throttle may be controlled independently of the brake.

17. In a device of the character described,

the combination. with a revoluble operating drum adapted to receive a flexible member, an engine for driving the drum in one direction, pull of the flexible member'causing the rotation of the drum in the opposite direcm0 tion, a brake on said drum adapted to be applied automatically consequent upon the rotation of the drum in the latter direction, a clutch between the engine and the drum, means for operating the clutch, means for releasing the brake varying degrees, an operating lever for causing such release, means controlling said clutch connected ,with said lever, and means including a slide and a cooperating segmental finger connected with said lever for controlling the'engine, the release of the brake taking place in a zone of movement in which the other connections are in-operative, and starting from brake applied position when the lever is in initial engine stopping position.

18. In a device of the character described, the combination, with a drum, a throttle controlled engine, gearing between the engine and drum, a brake on the drum, said brake tending to apply itself in one direction of rotation of the drum, a lever for releasing the brake in varying degrees against its tendency to be applied and acting to leave the brake applied in initial stopping position of the engine, a lost motion connection between said lever and the throttle comprising a slide and a cooperating arcuate edged finger, a clutch in said gearing, and means connected with said lever for operating the clutch.

19. In a device of the character described, the combination with an engine, of an operating member driven thereby, a sliding member for controlling the operation of said engine, said member having a shoulder thereon, a finger adapted to engage said shoulder and having an arouate surface whereby the slide may be moved by the finger in one direction, and held against return movement by the arcuate surface.

20. In a device of the character described, the combination, with a drum, a brake tending to automatically resist movement of the drum in one direction and be idle in the other direction, an engine/for driving the drum, and a manually operable controlling member adapted in one direction of movement from the neutral position in which the engine is not operated to start the engine, and in its other direction of movement from the neutral position to gradually re-. lease the application of the brake, said means including also a slidable member, anda cooperating segmental finger.

21. In a device of the character described, the combination of a drum for a flexible member, an engine for driving the drum in one direction, a brake tending automaticallv to resist the movement of the drum in t e opposite direction, said brake includin a flexible band embracing a portion of said drum and having. a lever connected to one end of the band and depending there from and engaging a stop, and a link connection between the other end of the band and said lever, whereby when said lever drops the angle between the lever and surface of the drum is changed in the direction to tighten the band by pulling on said link.

22. In adevioe of the character described, the combination of a rotatable member having a drum, a brake tending automatically to resist the movement thereof in one direction, said brake includin a flexible band embracing a portion of said drum and having a lever connected to one end of the band and depending therefrom, a stop engage-d thereby and a link connection between the other end of the band and said lever, whereby as said lever moves toward the stop its angle between the lever and surface of the drum is changed, pulling on said link, the opposite direction of movement of said drum tending to raise said lever and automatically release said brake, and manually operable means for raising said lever independently of the direction of rotation of the drum.

23. In a device of the character described, the combination, with an engine, of a drum, gearing connecting the engine and drum including a clutch, a pressure fluid operating means for operating the clutch, a valve controlling said means, a brake for the drum, means for controlling the brake, a hand lever actuating said means, a slide for moving the valve and having a pairof separated shoulders, a finger for engaging said shoulders, a rock shaft carrying the finger, a second slide adjacent the first, a finger on the rock shaft for actuating the second named slide, a rock arm loosely mounted on the rock shaft, a lever slidably carried by the rock arm, coacting projections carried by the last named slide and said lever adapted to removably engage, means connected with said rock shaft and said brake operating lever, and a link conmeeting the first named lever with the engine.

24. In a device of the character described, the combination, with a throttle controlled eng ne, of a drum, gearing connecting the engine and drum including a clutch, a pressure fluid operating means for operating the clutch, a valve controlling said means, a

brake for the drum, means for controlling the application of the brake including a rock shaft, a hand lever for moving said rock shaft, a slide for moving the valve and having a pair of separated shoulders, a finger havin shoulders and an arcuate surface, a roc shaft carrying the finger, whereby movement of the rock shaft may move the slide in either direction through part of its movement while the arcuate surface may engage the shoulder to resist movement of the slide durin other parts of the movement of the rock a aft, a second slide 2% adjacent the first, a finger on the rock shaft for actuating the second named slide, a

rock arm loosely mounted on the rock shaft,

shaft and saidbrake operating lever, a link.

connecting the first named lever with the throttle, whereby said lever may actuate the throttle, close or open the clutch or regulate the brake through different zones of" movement respectively and whereby said throttle may be operated bythe slidable le- 15 ver only by disconnecting it from its slide.

25. The combination, with a throttle controlled engine, of a drum driven thereby, a clutch between the engine and drum, a brake on the drum, a manually operable member connected with the throttle, clutch and brake adapted to control the same in different ranges of movement of said member, the throttle connection being disengageable, and a second lever adapted to operate the throttle independently of the clutch and brake. Y I

In testimony whereof, I hereunto afiix my signature.

HOLLIS H. mm.

Images