US706400A - Friction-clutch. - Google Patents

Description

Patented Aug. 5, I902.

0. A. FISHER.

FRICTION CLUTCH.

( Application filed Oct. 15. 1901.)

(No Model.)

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CHARLES ALBERT FISHER, OF TI-IQROLD, CANADA, ASSIGNOR OF ONE-TENTH TO CURT C. ANDREWS, OF NORTH TONAWANDA, NEWV YORK.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 706,400, dated August 5, 1902. Application filed October 15, 1901. Serial No- 78,'720. lNp mcdel.)

To all whom it may concern:

Be it known that I, (ll-IARLES ALBERT FISHER, a citizen of the UnitedStates, residing at Thorold, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Friction-Clutches; 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 use the same.

My invention relates to friction-clutches; and its primary object is to provide a simple, inexpensive, and effective device of the character named in which the operative mechanism will be entirely inclosed', thus avoiding projecting parts and presenting only smooth surfaces on the exterior of the clutch. I thus avoid the danger of injury to workmen caused by the contact of their hands or clothing with projecting revolving parts of the clutch.

The invention comprises a pulley loosely mounted upon a shaft, a disk fixed upon the shaft, friction devices carried by said disk, and a sleeve slidably supported upon the shaft for operating the friction devices.

The construction of the improvement will be fully described hereinafter in connection withthe accompanying drawings, which form part of this specification, and its novel features will be defined in the appended'claims.

In the drawings, Figure 1 is an elevation of the clutch in'its closed position. Fig. 2 is a similar view showing the clutch in its open or released position. Fig. 3is a section taken on the line 3 3 of Fig. 4. Fig. 4 is a transverse section showing the inner side of the disk and the friction devices secured thereto in elevation; and Fig. 5 is a detail section,on an enlarged scale, of one of the pivotal supports of the friction devices.

The reference-numeral1 designatesashaft, upon which is loosely mounted a pulley comprising a sleeve 2, a disk 3, and an annular horizontal flange i. The pulley is supported in position upon the shaft by a ring 5 and a set-screw 6.

7 designates a disk formed with an integral sleeve portion 8, which is fixed to the shaft by means of a suitable key 9. The sleeve 8 of the disk is formed at diametrically opposite points with elongated slots 10,within each of which is pivotally secu red an arm 11. The inner ends 12 of these arms extend within the pulley, as shown in Fig. 3, and are hooked to engage the links 13, by mearisof which the arms are connected to the hooked ends 14E of curved levers 15.

The levers 15 are pivotally secured to the inner side of the disk 7 at the points 16 and at their outer ends to friction-shoes 17, said shoes being rounded to conform to the inner surface of the flange at of the pulley. The shoes 17 are oppositely disposed, as shown in Fig. 4, and are pivotally secured adjacent to their ends to links 18, the inner ends of which are pivotally secured to bosses 19, projecting from the inner side of the disk 7 and adjustably secured thereto by bolts 20 and nuts 21. The bolts 20 are adjustably secured by setscrews 22.

The levers 15 are secured to the disk by coil-springs 23.

24=designatesasleeve slidably mounted upon the shaft and adapted to be forced over the arms 11 to press said armstoward each other and force the friction-shoes into engagement with the inner surface of the flange 4 of the pulley. The sleeve 24 is provided with an integral grooved extension 25 to receive a shifting ring 26, adapted to be operated by a lever 27, as illustrated in Fig. 1.

The operation of the mechanism as thus described is as follows: When the sleeve 24 is in the position shown in Fig. 2, the friction-shoes will be out of contact with the flange of the pulley, and said pulley will be thus released and will not turn with the shaft; but when the sleeve 2& is moved inward to the position shown in Figs. 1 and 3 the arms 11 will be movedtoward each other, thus tilting the curved levers 15 and forcing the shoes into frictional engagement with the inner surface of the pulley-flange 4. The pulley and disk are thus firmly locked together to turn with the shaft. When the sleeve 24 is moved outward to the position shown in Fig. 2, the springs 23 retract the curved levers to release the-friction-shoes. By means of the bolts 20 and the set-screws 22 the friction-sh0es may be adjusted to compensate for wear.

It will be noted that by the construction above described all of the operative mechanism is inclosed within the pulley and smooth surfaces are presented on both sides of the device as well as on the periphery of the pulley, and hence the liability of injury to workmen or others is entirely avoided.

I would have it understood that the inven tion is not restricted to all of the details of construction shown and described, but that I reserve the right to make all such modifications and changes as may properly fall within the scope of the invention as set forth in the following claims.

I claim-- I 1. A friction-clutch comprising a revoluble pulley, a fixed disk, arms pivotally secured to the disk, levers 'fnl'crnmed upon the disk and having friction-shoes, connections between the arms and levers, and laterallymovable means for operating the arms and levers.

2. A friction-clutch comprising a looselymounted pulley, a fixed disk having a slotted sleeve extension, arms pivotallysecu red within said extension, oppositely-disposed levers fulcrumed nponsaid disk, connections between said arms and levers, a sliding sleeve for operating said arms and friction-shoessecured to'said levers.

3. A friction-clutch comprising a looselymounted pulley; a fixed disk having a sleeve extension; arms pivotally secured within the CHARLES ALBERT FISHER.

Witnesses:

F. O. MCCLEARY, HERBERT D. LAWSON.

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