US1270950A - Irreversible gearing. - Google Patents

Description

E. G. JOHANSON.

IRREVERSIBLE GE'ARING.

APPUCATION man ocT.25. 191a.

Patented July 2, 1918..

Wae55e6 @et I b l Ell/[IL GOTTFRIED JOHANSON, 0F ROCKFORD, ILLINOIEL IRRE'VERSIBLE GEARIN G.

Application filed October 25, 1913.

To all whom it may concern:

Be it known that I, EMIL Gor'rrnino Jo- HANSON, of Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Irreversible Gearing, of which the following is a specification.

My present invention relates in general to gearing, and more particularly to irreversible gearing, and has special reference to the provision of an improved form of irreversible speed changing gearing.

The principal objects of my present in vention are the provision of an improved power transmission gearing, and more particularly a gearing wherein the primary driven element is moved at a rate of speed different from the driving element, characterized by the fact that the ultimate driving clement, while it moves freely either clock wise or contraclockwise according to the motion imparted to it through the primarily driven element, nevertheless, in turn, is so disposed as to be incapable of transmitting motion to the said primary driven element; the provision of an improved structure of the class referred to which may be easily and inexpensively constructed but which, however, may be operated and maintained at a lowv cost and is not apt to become out of order.

While gearing of the present type has a wide field of usefulness, I find it peculiarly adapted for the delivery of power for the operation of passenger and freight elevators, where it is highly desirable that in the event of any failure of the motive power which drives the gearing, such gearing will not run loosely and allow the elevator car to descend rapidly, or fall as it is said, with consequent danger to life and property.

I have therefore in the present instance as a matter of convenience disclosed my improvements in a form applicable for elevator service, and in the accompanying drawing have illustrated a preferred type of construction employed by me for such purpose.

In the drawing- Figure 1 is an elevational view of an elevator driving mechanism embodying my present improvements;

Fig. 2 is a face view of speed changing gearing, the casing of which is indicated at Specification of Letters Patent.

Patented July 2, 121.2.

Serial No. 797244;.

2 in Fig. 1, regarding it from the aspect indicated by the arrow in such figure; and

Fig. 3 is a central sectional view of the gearing.

Referring first to Fig. 1 of the drawing it will be observed that I have here illus trated in a somewhat diagrammatic form an embodiment ofmy invention which is, as above stated, applicable for driving elevator cars, wherein I employ an electric niotor, 1, current for driving which is derived from any convenient source of supply (not shown), the outer end of the armature shaft 3 of said motor being supported by a standard 4 and provided with a pinion 5 for driving a chain 6 which in turn drives the pinion 7 of the speed changing gearing at one side of the casing or housing 2 thereof, the opposite side of said gearing being provided with a sprocket 8 which drives a chain 9 engaging a sprocket 10 on the overhead sheave shaft 11 which carries the main sheave (not shown) customarily employed for supporting the cables of the elevator car.

Referring now more particularly to Figs. 2 and 3, it will be observed that the main casing or fixed gear member 2 is provided with an annular flange 12 having a dependent portion 14 secured thereto in a suitable manner such as bolts 15, said member 14 be- 111g provided on its inner periphery with a number of gear teeth 16. Within the casing 2 and preferably concentrically with portion 14, is revolubly mounted. a second gear member 17 having a projecting annular flange 18 provided on its inner periphery with teeth 19, and within the casing is further mounted a third gear member, preferably a disk 20 having teeth 21 meshing with said teeth 16 and 19, said member 20 being preferably of materially less perimeter than the said portions 14 and 18. Ihe member 17 has provided thereon a hub 22 which extends through the casing 2 and carries at the extremity of such hub, as an ultimate driving element, a sprocket 8, non-rotatably mounted thereon, a collar 23 being employed to space said sprocket 8 away from the casing 2, and a collar 24 held in position by a set screw 25 bearing on the shaft 26 being utilized for holding said sprocket 8 in position on said hub 22 for rotation therewith. The shaft 26 has an eccentric or crank portion will 27 centrally engaging the gear 20, and a priinarily driven memberthe pinion 7-is carried at the extremity of said crank shaft 26 but spaced away from the gear 20 by a collar 28 held in-position bya set screw 29, bearing on the shaft 26. As will be clearly seen from examination of Fig. 2 of the drawing, the member 14 has teeth, 16, one more or less in number than the teeth, 19, on the member 18 for the purpose now to be described.

In the operation of the device it will be apparent than on motion being transmitted to the pinion 7 by means of the'chain 6, the shaft 26 will also be rotated through the eccentric or crank 27, thereby causing free rotation of the gear'2O in an opposite direction, and owing to the fact that the teeth 21 of said gear 20 mesh with the teeth '16 of-the annular member 14, the member 17 is r0- tated in a direction opposite to the pinion 7, and the sprocket 8 moves concentrically with said gear 17.

I vAs will be clear from the drawing, (Fig. 2) the pinion 7 moves freely either clockwise or contraclookwise, but owing to the locking of the gears 16 and 19 by means of the gear '20, when power is applied to thesprooket 8, as by the weight of the elevator car, no motion is transmitted and the mechanism remains stationary, since neither the gear 20 nor the pinion 7 or any other of the parts of the mechanism are movable by means of the sprocket 8.

The form of gearing here shown gives a reduction of about 33 to 1, but obviously a large range of reduction ratio may be attained by varying the proportion of the gear 20 to the gears 1e and 18.

Having thus described my invention and I of teeth being of a diameter which is less than the diameter of the member having the larger number of teeth, and a driving pinion located eccentrically within said gears and in mesh therewith, said pinion having portions of different diameters to conform to the difi'erence in the diameters of the internal gears.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

EMIL GOTTFRIED JOHANSON.

Vitnesses MARTHA WESTMAN, PAUL CARPENTER.

DQ013165 of thispatent may :be obtained for five cents each, by addressing the Commissioner of Patents, "Washington, D. G.

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