US866282A - Shifting and locking mechanism for friction-band clutches. - Google Patents

Description

No. 866,282. I PATENTEDI'SEPT. 17, 1907.

V J. 11.1mm & J. n. 'RAUGHP SHII'TING AND LOOKING MECHANISM F03 FRICTION BAND OLUTGHES.

APPLIUATIOH FILED FEB. 12, 1907.

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JljfiN DBAUCH a 7 ATTORNEYS No. 866,282. PATENTED SEPT. 17, 1907.

J. P. .KARR & J. n. RAUOH.

SHIPTING AND LOOKING MECHANISM FOR FRICTION BAND GLUTGHBS.

' APPLIGATION nun rm. 12, 1907.

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mnmmmmlmlmmg INVENTOHS P-KAR'R I JDHN DRAUEH ATTORNEYS II VI UNITED STATES PATENT OFFICE.

JAMES P. KARE AND JOHN D. RAUOI-I, OF LOGANSPORT, INDIANA.

l SHIFTING AND LOOKING MECHANISM FOR FRICTION-BAND CLU'IOHES.

Specification of Letters Patent.

Patented Sept. 17, 1907.

Application filed b y 12,1907. Serial No. 357,014.

To all whom it may concern:

Be it known that we, JAMES P. I ARR and JOHN D. RAUCH, citizens of the United States, and residents of Logansport, in the county of Cass and State of Indiana, have invented a new and Improved Shifting and Locking Mechanism for Friction-Band Clutches, of which the following is a specification.

Our invention is applicable to drums of hoisting engines for locking them to a countershaft which is driven from an engine or other motor.

Our improved mechanism is adapted to lock the drum automatically when the former is adjusted in a certain position, but both locking and releasing of the friction band applied to the drum may be easily and quickly effected.

The details of the construction, arrangement, and combination of parts are as hereinafter described, and illustrated in the accompanying drawings, in which Figure 1 is mainly a central vertical section of a hoisting drum and driving gear with our improved mechanism applied thereto. Fig. 2 is a side view of the friction band. Fig. 3 is mainly a face view of the driving gear with our improved mechanism applied thereto, some portions being shown in section. Fig. 4 is a plan view of the hoisting drum, the driving gear and our improved mechanism applied thereto, portions being broken away and shown in section for better illustration.

In Fig. 1 a hoisting drum 1, of which a portion only is shown, is mounted loose on a shaft 2, which, in practice, is parallel to a driving shaft operated directly from a motor. A large spur gear 3 is fast on the shaft 2, the same being driven in practice directly from the engine shaft. On the outer side the gear 3 is provided with an extended hub 3 upon which is mounted a yoke 4 whose diagonally opposite arms 4 are connected, see Fig. 3, by toggles 5 with knuckles 6 that are pivoted to crank arms 7 and 8. These crank arms are mounted upon pins 9 and 10, respectively, which are located diametrically opposite and close to the rim of the wheel through which they pass, and project from the opposite or inner side of the same. The pin 10, see Fig. 2, passes between the band 19 and a bowed plate spring 19 whose ends are connected with the band. The function of the spring 19 is to draw the band away from the periphery of the drum when the band is released by the toggle mechanism. The crank 8 is single, but the crank 7 is double, the arm 7 thereof projecting on the opposite side of the pivot 9 and being connected by a bar 11 with the opposite crank 8. The arm 7 and the crank 8 pro ject on the same side of their respective pivots 9 and 10 while the crank 7 projects on the side opposite or the reverse of the crank 8. The yoke 4 connected with the toggle links, as before stated, is shifted on the hub 3 of the drive wheel by means of a lever 12,

see Fig. 4, the inner end of the same being bifurcated and attached to pins 13 on a band 14 arranged in a groove on the hub of the yoke 4, so that the yoke may revolve freely independently of said band.

The outer end of the shifter lever 12 is pivoted loosely at 15 and it is operated for shifting the yoke 4 by means of toggle mechanism comprising links 16 and a rod 17 which is in practice connected with a hand lever (not shown). The said rod is attached to the pivot which connects the two links 16. The outer pivot 18 of the outer link is fixed in position and hence by traction on the rod 17 the link 16 may be brought into alinement, and the shifter lever 12 forced inward and the yoke 4 also forced inward on the hub 3 of the drive wheel, in which case it is apparent the links 5 that connect the yoke with the levers 7, 8, will be brought into alinement with those parts. Since the cranks 7, 8, are keyed to their respective pins 9 and 10 it is further apparent that this movement of the toggle mechanism will cause rotation of the said pins, although it is not absolutely essential that the pin 10 should be rotated. The crank pin 9 passes through a loop on one end of the friction band 19, see Fig. 2, and its inner end through a short crank 9 which is connected with the opposite end of the band 19 by a rod 20 that passes through a lug on the band and is provided with a spiral spring 21 which normally separates the band ends when released.

It will now be understood that when the toggle mechanism 16, 17 is operated and the shifter 12 is caused to move the yoke 4 inward on the hub of the driving wheel 3, the cranks 7 and 8 are forced apart, as indicated by dotted lines Fig. 3, whereby the pin 9 is rotated thus carrying its crank 9, see Fig. 2, to the left and drawing the ends of the band nearer each other so that it is clamped on the friction surface 22 of the hoisting drum 1, with the result that the drum is locked to the gear 3 and rotates therewith until the band 19 shall be released, Nuts 23 are applied to the rod 20, see Fig. 2, and serve as means for adjusting the normal distance between the ends of the band and thereby regulating the friction with which the band may be applied to the drum. In other words this arrangement enables a primary adjustment to be made and provides for taking up wear. When the parts are thus operated and the yoke 4 is moved inward to its limit so that the links 5 are brought into alinement with the connected parts, it is apparent that the toggle mechanism is self-locked and that it will retain its position until released by the application of due force. This is applied through the same means by which the yoke was shifted inward, namely, the toggle mechanism 16 and 17, the shifter 12 and the band 14 applied to the yoke 4. It is obvious that very little force is required toapply the.band to or to disengage it from the hoisting drum. 1n other'words, the power of the toggle mechanism increases as the band tightens on the drum, by a well understood law. It

will be further seen that the total power applied by the shifter and conveyed by the toggle links through the cranks and connecting bar is applied to the pin 9, that is to say, that pin which connects the ends of the friction band. The bar 11 equalizes the action of the cranks as will be readily perceived. Of course, the points of attachment of the links or rather the knuckles 6 to the respective cranks are the same distance from the respective pins 9 and 10.

We claim 1. The combination with a rotatable shaft, a driving gear keyed thereon and a drum loose thereon and provided with a peripheral friction surface, of a friction band applied to said surface, pins passing through the peripheral portion of the gear and provided with cranks one of the pins being connected with both ends of the divided band, single and double cranks applied to the pins on the outer side of the gear, an equalizing bar connecting the single crank with the double one, a yoke which is slidable on the hub of the gear, toggle links and pivoted knuckles connecting the yoke with the cranks of the two pins, and a shifter for moving the yoke in and out for applying the band and locking the same automatically as shown and described.

2. The combination with a rotatable shaft, a gear fast thereon and a hoisting drum mounted loose thereon and 'having a peripheral friction surface, of friction clutch one of them constructed double, an equalizing bar connecting said double crank with the opposite one, a yoke adapted to slide on the hub of the gear, and toggle links which operatively connect it on opposite sides with the cranks of the respective pins, the arrangement being such that when the yoke is moved inward the toggles are brought in alinement with the connected parts and the band thereby locked on the drum, and means for shifting the yoke, as described.

3. The combination with a rotatable shaft, a gear fast thereon and a drum loose thereon, a friction band, cranks and pins connected therewith and toggle mechanism for operating the band and including a yoke adapted to slide toward and from the gear, of means for shifting such yoke the same consisting of a pivoted lever, a band ap plied to the yoke circumferentially and connected with said lever, and toggle mechanism also connected with the lever for shifting it on its pivot, as described.

4. The combination with a rotatable shaft, a driving gear which is fast thereon and a loose hoisting drum mounted on the shaft, of a divided friction band applied to the drum, pins passing through the peripheral portion of JAMES P. KARR. JOHN D. RAUCH. Witnesses:

FRANK P. WILKINSON, HARRY C. KESLING.

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