US716219A - Clutch. - Google Patents

Description

2 Sheets-Sheet L atzanzey Paten'ted Dec. l6, I902. .W. S. GRAHAM. CLUTCH. (Application filed June 5, 1902.)

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W; S. GRAHAM;

CLUTCH.

(Application filed June 5, 1902,)

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WILLIAM S. GRAHAM OF CANTON, ILLINOIS, ASSIGNOR TO PARLIN AND ORENDORFF COMPANY, OF CANTON, ILLINOIS, A CORPORATION OF ILLINOIS.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 716,219, dated December 16, 1902. Application filed June 5, 1902. Serial No. 110,385. iNo model.)

To ctZZ whom it may concern: 1

Be it known that '1, WILLIAM S. GRAHAM, of the city of Canton, county of Fulton, and State of Illinois, have invented certain new and useful Improvements in Clutches, of.

. fication, Figure 1 is a plan of so much of a. zoplanter as is needed to show my inventionf Fig. 2 is a side elevation of the clutch,show ing the clutch members separated. Fig. 3 is a side elevation of the clutch, showing the members thereof engaged or in mesh.

A drill-shaft is shown at 1, and a checkrow shaft at 2. 3 represents a sprocketwheel, which is journaled on shaft 1 and driven by a chain 29, which receives motion from the covering-Wheelsof a planter in the,

3,0 usual manner. A clutch-rim 4 projects laterally from the face of the sprocket-wheel,

and the perimeter of the rim is externally corrugated or provided with a set of crosswise-extending concavities. A stoparm is 5 attached to shaft 1 alongside the ratchet-r1 m and such stop-ar1n is duplex in general. construction, in this particular instance one branch or extension being shown at 9 and the other at 10. The stop projection for ex- 0 tension 10 is shown at 14. Anincline 13 is formed on extension 9 of the stop-arm in advance of stop projection 11, and a concavity 12 is formed in the incline immediately in front of the stop projection. The extension 10 is similarly provided with an incline and a concavity therein. Theextension 10 of the stop-arm is aduplicate of extension 9, and the position of one extension is diametrically opposite the position of the other extension.

so A lug 5 is formed on the stop-arm. It 'projects from the shaft at approximate right angles with the face of the arm, and it provides a pivot 28 for a releasable clutch member 6. The releasable clutch member is duplex in general construction in this instance, and one of its ends is provided with a laterally-extended roller or cylindrical bearing 7, which is adapted to engage the concavities of the clutch-rim 4. Each end of the releasable clutch member has a trip-nose, as 8, bymeans of which the roller 7 is pressed from contact with the clutch-rim, and a spring 24 connects the releasable clutch member with an extension 23 of the stop-arm and tends to hold the trip-noses in advance of the stop projections 11 and 14. A throw-out arm 15 hasa laterally-extending stop-pin 16, (shown only in dotted lines,) and when such pin is in the path of the trip-noses of the releasable clutch member and the stop projections of the stoparm it will first swing the releasable member clear of the clutch-rim and then stop the rotation of shaft 1. The arm 15 has an extension 17 beyond pin 16, and an arm 18 on the check row shaft 2 is hooked at 19 to engage the extension 17 of the throw-out arm. A spring 21 connects at one end with an extension 20 of arm 18 and at the other end with an extension 22 of arm 15, thereby tending to hold the arms in the position shown in Fig. 2. When the check-row shaft 2 is rocked backward, as shown in Fig. 3, the hooked end 19 of arm 18 will press downward on extension 17 of the throw-out arm and carry the pin 16 from engagement with a trip-nose of the releasable clutch member and a stop projection of the stop-arm. As soon as that is done the spring 24 will advance the trip-noses with relation to the stop projections and carry roller 7 into engagement with the clutchrim 4. The check-row shaft returns to its original position immediately after being rocked backward, and the throw-out pin 16 is at once returned to an operative position. When the shaft 1 has completed a one-half rotation, the trip-nose opposite the one formerly engaged strikes the pin 16 and is forced by theresistance of the pin to carry the clutch-roller 7 from contact with the clutch-wheel. As the clutch approaches a stop position an incline 13 of the stop-arm presses the stop-pin outward a slight distance, and when a stop is completely effected the pin is forced into depression12 and the clutch members are forced apart.

The object of making the stop-arm and the releasable clutch member in duplicate is to enable the drill-shaft to be stopped at onehalf rotations instead of making complete rotations, as in clutches heretofore constructed. This provision somewhat lessens the work of turning the shaft, and it reduces the jar incident to the stopping of the shaft. The gear between the shaft 1 and the dropping-Wheels of the seedboxes is so proportioned that a one-half rotation of the shaft moves the seedwheels sufficiently far to deliver the number of grains required in a hill into a shank of the planter in this particular instance; but it will be obvious that a complete rotation of shaft 1 may be used to drop a hill from a seedbox, and in that instance but one of the trip-noses would be required on the releasable clutch member.

By forming the corrugations on the external surface of the clutch-rim the number of corrugations of a certain width is greater on a wheel of a certain diameter than if the corrugations were made in the inner rim, which lessens the dis-arrangement incident to slippage of the clutch, or failure to engage, there is no tendency for the clutch-Wheel to accumulate and retain dirt or trash on its operative surface and the action of the wheel on the shiftable clutch member is in the nature of a pull instead of the push developed in wheels having the ratchet corrugations inside a rim of the wheel. Moreover,the clutch-bearings may be placed farther from the center of the wheel in .a wheel of a certain size by forming the corrugations outside the rim, and the clutch may be broken or disengaged by a shorter movement of the trip end of the shiftable clutch member.

The arm 18 on the check row shaft is shorter than the throw-out arm 15 and the stop-pin 16 is between the ends of the throwout arm. As a result of this arrangement the stop-pin moves so slowly or so short a dis: tance that it does not swing clear of the nose of the releasable clutch member until the check-row shaft has about completed its work of discharging the seed from the second or final drop. This assures the return of the intermediate valve to a seed-intercepting position before the first drop begins to drop seed.

The spring 21 performs the double function of retracting the check-row shaft after an operative throw thereof and of holding the throw-out arm for the clutch in position to engage the releasable clutch member.

I claim- 1. In a clutch, the combination of a shaft, an externally-corrugated wheel journaled on the shaft, a pivot-bearing secured to the shaft eccentric with the wheel and inside the perimeter thereof, a clutch-arm swung on the pivot-bearing and extended beyond the perimeter of the wheel, a lateral extension on the clutch-arm outside the wheel, such extension being adapted to engage the external surface of the wheel, a spring tending to hold the arm in engagement with the wheel, and a throwout to disengage the arm from the wheel.

2. In a clutch, the combination of a shaft, an externally-corrugated wheel journaled on the shaft, a pivot-bearing secured to the shaft eccentric with the wheel, a clutch-arm swung between its ends on the pivot-bearing, a lateral extension on the clutch-arm adapted to engage the external surface of the wheel, a spring tending to hold the arm in engagement with the wheel, a throw-out to disengage the arm from the wheel, and a trip-nose on each end of the arm, adapted to strike the throwout and stop the shaft 'after each semirotation.

3. In a clutch, the combination of a shaft, an externally-corrugated wheel journaled on the shaft, a pivot-bearing secured to the shaft eccentric with the wheel, a stop-arm fixed between its ends on the shaft, and having a stop projection at each end, a clutch-arm swung between its ends on the pivot-bearing, a lateral extension of the clutch-arm adapted to engage the external surface of the wheel, a spring tending to hold the lateral extension in engagement with the clutch-wheel and also hold the trip-noses in advance of the stop projections, and a throw-out to engage the tripnoses and the stop projections, to release the clutch and stop the shaft.

4. In a clutch, the combination of a shaft, a clutch-wheel journaled on the shaft,a clutcharm journaled between its ends eccentric of the shaft and adapted to engage the wheel, and a throw-out to engage either end of the clutch-arm and detach the arm from the wheel on semirotations of the shaft.

5. In a clutch, the combination of a shaft; an externally-corrugated wheel journaled on the shaft; a stop-arm havinga stop projection, an incline in front of the stop projection and a concavity between the incline and the stop projection; a clutch-arm adapted to engage the external surface of the wheel; a throwout arm, and an extension of the throw-out arm adapted to ride up the incline of the stoparm and rest in the concavity in the act of releasing the clutch-arm.

6. In a clutch, the combination of a clutchwheel, a releasable clutch member, a throwout arm, a rock-shaft, an arm on the rockshaft adapted'to move the throw-out arm, and a spring connecting at one end with the throw-out arm and at the other end with the arm on the rock-shaft.

In testimony whereof Isign my name in the presence of two subscribing Witnesses.

WM. S. GRAHAM.

WVitnesses:

WALTER B. BARNEY, CARL B. CHANDLER.

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