US1129018A - Frictional gearing. - Google Patents

Description

L. L. ROBERTSON.

FRICTIONAL GEARING.

- APPLIGATION FILED MAY 14, 1914.

1,129,018. Patented Feb. 16, 1915.

2 SHEETS-SHEBT 1.

132m I amioewt oz W W I L. L. Razfiwfsm 6] bl'oonu L. 'L. ROBERTSON.

FRIGTIONAL GEARING.

APPLICATION IILED MAY 14, 1914 1, 1 $9M 1 Patented Feb. 16,1915.

2 SHEBTS-SHEET 2.

w-i-bmwaeo f vemoz 10 LL. RobeWZ 60/21 THE NcRRls PETERS cm, WASHINGTON, n c

LEVI L. ROBERTSON, OF MADISON, MINNESOTA.

FRICTIONAL GE'A'HRING.

Specification of IiettersfPat'ent.

Patented Feb. 16,1315.

.AppIicationsfiIed-May '14, 1914. Serial N 0.183%,521.

To all whom z't-mayconcem Be it-known {that I, LEvI L. RoBnR'rsoN, a citizen of the United States, residing at Madison, the county of Lao qui Parle and State of Minnesota, have invented certain new and useful Tmprovementsin Frictional Gearing, of which the following is a specification.

My invention relates-to improvements in frictional gearing, adapted to be used in driving endless carriers or the like, While not necessarily restricted to such use.

Animp'ortant object of the invention is to provide .gearing of the above mentioned character, which .issimple in construction, and convenient in use.

Other objects and advantages of the .in vention will be apparent during the course of the following description.

in the accompanying drawings forming a part of this specification and in which "like numerals are employed to. designate like parts throughout the same, Figure l is a perspective view :of apparatus embodying my invention, Fig. 2 is 'a side elevation of frictional gearing embodying the invention, Fig. 3 is an edge elevation of the same, and Fig. 4: is a plan view of the same.

The numeral 1 15 designates a vertical frame or supporting structure, as a .whole. This frame :is shown as comprising upright transverse suppprting members '16 and 17, which are identical. It is to be understood that the construction of these upright supporting members may :be varied, as :may be found advantageous. The upper and lower ends of these transverse supporting members are connected by horizontal rods 18, as shown.

Arranged within the compartments or spaces occurring between the upright supporting members 16 and '17 are pairs of end-.

less belts 19. In the compartment between the upright supporting members 16, are arranged carriers 20, in the form of shelves. These shelves are pivotally connected with the endless belts 19. In the compartment between the upright supporting members 16 and 17 are carriers 25,*pivoted to the endless belt 19. The endless :belts 19 are passed about upper and lower pulleys or' wheels '27 and 28. The upper pulleys .or wheels 27 are retatably mounted upon stub-shafts 29 by a clamp-nut 3 :orthe like, suitably secured to the upright supporting-members. The lower pairs of pulleys or wheels28 are -ri idly mounted upon independently rotata 1e :horizontal shafts 3.0, .suitably .journaled through portlons of the upright supporting members 16 and 17 as shown. It is obvious that by rotatlng each of the upper pairs of wheels or pulleys 27, the carriers may be raised or lowered, depending upon the direction of such rotation. The pulleys or Wheels 27 and 28ers preferably provided near their outer ends1 with annular flanges 31 and 32 respectivey.

As more clearly shown in Figs. 2, 3, and 4;, a reclprocatory carriage 33 is arranged upon the inner side of the upright supporting member, above and adjacent the flanged wheel or pulley 27. This reciprocatory carriage includes a frame portion 34:, provided with .a tubular extension 35, preferably "in- .tegral therewith. The numeral 36 desigenates a 1 horizontal guide-rod, .which is square :in cross-section and has its outer end rigidly-secured .to the adjacent upright by a clamp 36. The inner end of the rod 36 is slidably :mounted in the tubular extension 35 of the frame 33, as shown, to support the same. Surrounding the rod 36 is a suitably :stifi compressible-and expansible coil spring :37, serving to automatically move the carriage 34: inwardly or rear-wardly and normally retain the .same in such position. Piv- :otally mounted upon the tubular extension :35 'of the frame 33, is an apertured longitudinally curved brake-shoe 38, held in place 7 and arranged to engage with the flange 31. Rotatably mounted Within the carriage 34 is an intermediate friction wheel or pulley 39, which is out of engagement with the flange 31 when the brakeshoe engages the same but is adapted to engage with this flange when the brake shoe disengages the flange. The friction pulley or wheel 39 :iscarried by a stub-shaft 3.9 operating through elongated slots 39', formed in the-carriage, asshown.

The numeral 40 designates an inner forked shifting frame, straddling the pulley 39 with its ends apertured to receive the and exipansible coil spring 41", having a than the spring 37, to compress or overcome the same.

Extending longitudinally through the.

supporting frame structure and near and above the Wheels or pulleys 27, is a common drive shaft 40, to one end of which is rigidly'connected a pulley 41, which may be rotated by any suitable form of prime mover, such as an electric motor, or the like. This pulley may be continuously rotated or intermittently rotated, as may be found advantageous Rigidly mounted upon the drive shaft 40 are friction pulleys 42, adapted to be engaged by the friction pulleys 39, as shown.

The springs 37 serve to normally retain the friction pulleys 39 out of engagement with the pulleys 42, and flanges 31 of the pulleys 27, the same being moved into engagement therewith by bell-crank levers 43, pivoted at 44. These bell-crank levers 43 have their upper ends apertured to loosely receive the ends of the inner frame 40 and engage the springs 41, to shift the carriage 34. Connected with these bell-crank levers are depending rods 45, having their lower ends pivotally' connected with frames46, in turn pivoted at 47. These frames are independently movable and have treadles 48 rigidly connected with the outer or forward ends thereof.

.The operation of the apparatus is as follows :Assuming that the drive shaft 40 is being rotated, when it is desired to operate either of the endless belt carriers, the corresponding treadle 48 is depressed. This movement of the treadle draws the rods 45 downwardly, whereby bell-crank levers 43 are swung outwardly. These bell-crank levers through the medium of the springs 41 and the inner frames 40 shift the carriages 34 forwardly, the springs 41 overcoming and compressing thesprings 37. The friction pulleys 39 are now moved into engagement with the pulleys 42 and the flanges 31 of the pulleys 27, the brake-shoes 38 being simultaneously moved out of engagement with the flanges 31. The rotation of the drive shaft 40 is now imparted to the pulleys 27, to drive the endless belt carriers. When the treadle 48 is released, springs 37 automatically shift the carriages 34'rearwardly, again applying brake-shoes 38 to the flanges 31, and simultaneously moving the pulleys 39 out of engagement with the pulleys 27 and 42. Attention is called to the fact that by the use of the springs 41,

the pulleys 39 are yieldingly held in frictional engagement with the pulleys 27 and 42. I

'It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape,

size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the sub- .joined claims.

for movement into and out of engagement with the same, and means to approximately simultaneously move the intermediate power transmitting pulley out of engagement with the driven pulley and brake the driven pulley to stop its rotation.

2. In apparatus of the character described, a driving pulley, a driven pulley, a movable support arranged near the driving and driven pulleys, an intermediate power transmitting pulley carried by the support and adapted for movement into and out of engagement with the driving and driven pulleys, and a brake member attached to the support and movable into engagement with the driven pulley when the intermediate pulley disengages the same.

3. In apparatus of the character described, a driving pulley, a driven pulley, a movable support arranged near the driving and driven pulleys, an intermediate power transmitting pulley carried by the support and adapted to engage and disengage the driving and driven pulleys, a brake member connected with the support and adapted to engage with the driven pulley when the intermediate pulley disengages the same, automatic means to move the support in one direction to move the intermediate pulley out of engagement with the driving and driven pulleys, and means to move the support in an opposite direction.

4. In apparatus of the character described, spaced driving and driven pulleys, a relatively stationary guide member arranged near and between the pulleys, a carriage mounted to reciprocate upon the guide member between the pulleys, an intermediate power transmitting pulley connected with the carriage to move longitudinally therewith, means to longitudinally shift the intermediate pulley and carriage in one direction, a spring to longitudinally shift the carriage in an opposite direction, and a brake element attached to the carriage and adapted to engage with the driven pulley.

55111 apparatus of the character described, spaced driving and driven pulleys, a relatively stationary guide member arranged near and between the pulleys, a main reciprocatory carriage mounted to slide upon the guide member and provided with longitudinal slots, a brake member connected With the carriage to engage and disengage the driven pulley, a supplemental reciprocatory carriage extending longitudinally of the main carriage and movable with relation thereto, a stub-shaft connected With the supplemental carriage With its ends projecting into the elongated slots of the main carriage, an intermediate pulley carried by the stub-shaft and adapted to engage and disengage the driving and driven 10 pulleys, and means to move the supplemental reciprocatory carriage.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

LEVI L. ROBERTSON. Witnesses:

I. M. HEGRE, OBERT R. NELSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

Images