US1854018A

US1854018A - Variable speed rotary motion transmitter

Info

Publication number: US1854018A
Application number: US487222A
Authority: US
Inventors: Carl S Carlberg
Original assignee: DAVID E KARLBERG
Current assignee: DAVID E KARLBERG
Priority date: 1930-10-08
Filing date: 1930-10-08
Publication date: 1932-04-12
Anticipated expiration: 1949-04-12

Description

April 12, 1932'. c. s. CARLBERG 1,354,018

VARIABLE SPEED ROTARY MQTION TRANSMITTER Filed Oct. 8, 1930 2 Sheets-Sheet l 'lll April '12, 1932- Q c. s. CARLBERG 1 1,854,018

VARIABLE SPEED ROTARY MOTION TRANSMITTER Filed Oct. 8, 1930 2 Sheets-Sheet 2 v BY/fVO/iWEXS.

- cm s. oABLBEaG.

Patented A r. 12, 1932 UNITED STATES PATEN'P OFFICE OI MO UND, MINNESOTA, ASSIGNOB OI ONE-HALF TO DAVID E.

KABLIBERG, OF TBENTON, NEW JERSEY VARIABLE SPEED BPTARY MOTION TRANSMITTER Application fled October a, 193o.- Serial no; 481,222.

My invention has for its object to provide an improved variable speed rotar mot on transmitter, and, to this end, my inventlon consists of the novel devices and combinail tions of devices hereinafter described and pointed out in the claims. Y

My invention in its preferred form is lllustrated in the accompanying drawings, wherein like notations refer to 11ke parts through-.

out the several views. o

In said drawings Fig.1 is a front elevatlon illustrating my invention as applied to transmit at variable speeds the rotary motlon'of the rotating part of an electric motor Fig. 2 is a view chiefly in end elevatlon but partlyin section on the line 2-2 of F1g. 1; Fig. 3 is a horizontal sectlon on the line 3-3 of Fig. 1;

Fig. 4 is a vertical section on the line 4-4 of Fig. 3;

Fi 5 is a vertical section on the hne 5-5 'of Fig. 3;

Fig. 6 is a horizontal secition on the line 6-6 of Fig. 1 and Fig. 7 is a vertical section on the l1ne,7-7 of Fig. 6. v

- The numeral 8 represents an electric motor of any standard or suitable construction. The rotating element of this electric motor, which, in this case, will be assumed to be the armature, has its shaft extended outward at one end to afford a projecting part thereof, which "is marked with the numeral 8a, on which some of the elements of my transmitter are mounted, as will presently be noted. The casing of themotor 8 is shown as provided with two pairs of spacing spools 8b PI'OJBCting outward therefrom parallel with the projecting portion 8a of the armature shaft. Two of these spools 81) project from near the bottom of the casing, in line with each other, and the other two project from nearthe top of the casing. in line with each other, as clearly shown in Figs. 1 and 2 of the draw- The numerals 9 represent a pair of horizontal bars provided with horizontal slots 9a near their opposite ends, and the numerals 10 represent headed bolts, the stems of which work through the slots 9a and are tapped into the spools 86 for adjustably securing the said bars 9 to the said s ools, and,

through. the latter, to the casing o the motor 8. The numeral 11 represents an n right bar provided with vertical slots 11a an 11b. The numerals 12 represent a pair of nut-equipped bolts, one of which works through the slot lla, and the other through the slot 116 for adustably securing the said bar 11 to the two orizontal bars-9. The saidv two bars 9 and the vertical bar 11, taken together, constitute a supporting bracket for some of the ele-v ments of my transmitter. The vertical bar 11 is of such length that it extends upward beyond the top of the motor, and has a vertical slot 110.

On the projecting part 8a of the motors armature shaft is directly, or indirectly mounted elements which co-operate to afford a prlmary pulley and a deliverypulley. These pulleys are both shown as of the conical flange type and are each diametrically divided into two sections which are axiall adjustable in orderto make the flanges o the respective pulleys engage the belt at different radial ihstancesfrom the axes of the respective'puleys.

The numeral 13 re resents a horizontal stud shaft removably ed to the up portion of the vertical bar 11 with its axis overlying and parallel with the axis of the PIOJGCtlIlg part'8a of the motors armature shaft; and this stud shaft 13 has mounted thereon and fixed thereto, a slotted sleeve 14, upon which is indirectly mounted, elements which co-operate to afford two conically flanged counter pulleys, each diametrically divided into two sections which are laterally adjustable in respect to each other in order to make the flanges ofthe pulleys engage the r end and bled; These detailswill now be ulle'y and delivery specified. The rima own i i ig. 6 of the drawpulley are best The co-operative sections of the primary P y 16, respectively. The section 15 is provided with'an enlarged hub 15a mounted directly onthe projecting portion 8a of the motors armature shaft and adapted to be rigidly connected therewith by a "am screw 15?), and,

hence, this sectio1i15a will be driven by the 7 motor shaft, at some constant predetermined shrunk together.

Iii) speed. The said hub of the section is also rovided with an axially projecting shaftike portion 150 on which is mounted the pulley section 16 and the lower members of a ball race track 17, which parts are rigidly connected to ther. As shown, said two parts shoulders which are are join by lap I aid section 16 also carries profileldowels lfia'which work through holes mthe sec 'on 15 and so connect the sections 15 and-.1 that they must always turn together. The numerals 18 represent the balls, and the numeral 19 the upper or outer sections of the race track. The numerals 20 and obvious that the pulley member 20, with the outer track 19, will rotate on the balls independent of the rotation of the

members

15 and 16 making up the primary pulley. The

member 21 of the delivery pulley has its body portion shouldered, and mounted on and secured to the upper track 22 of another ball race, the lower track 23 of which is mounted in' a recessed part of the stud shaft portion 150 of the section 15 of the primary pulley. section 21 of the delivery pulley extends inward and below the balls 24 and embraces a shouldered part of the inner track 23, and a retaining disk 25 is clamped against the outer ends of the said tracks by a headed screw 26 tapped into the end of the shaftlike' projected portion 150 of the section 15 of the primary pulley, as clearly shown in Fig. 6. In virtue of this mounting of the section 21 of the delivery pulley, it is obvious that it, and the upper track 22 of the ball race, willfturn on the balls 22 independently of the rotation of the primary pulley. The

section 20 of the delivery pulley has profile dowels 27 which pass through holes in the are marked with the numerals 15 and One wall of the recessed part of the member21, thereby connecting the sections 20 and 21 so they will always rotate together. The pulley sections 16 and 20 and the ball track sections to-which their inner ends are connected are loose on the laterall projecting or'stud shaft portion 150 of t e hub of the section 15 of the primary pulley, and, hence, may move laterally thereonand for this reason the said sections 16 an may be termed floating sections, the purpose of which will hereinafter appear.

Directing attention now to the elements of my transmitter which are mounted on the sleeve 14 carried by the stud shaft 13 fixed to the upright .bar 11 of the supporting bracket for'the transmitter, it has already been noted that the sleeve 14 is longitudinal- 1y slotted. These slots are opposite to each other, as best shown in Fi s. 3and 4 of the drawings, and both marke with the numeral 28.- In said sleeve 14 are a pair of nuts marked respectively 29 and 30, having webs which extend radially outward through the s'aid slots and travel therein. The outer por-,

tions of said nuts 29 and 30 are shouldered on their profile faces and recessed'on their peripheries, thereby adapting the same to serve as the under members of ball race tracks in which are mounted balls 31. The outer members 32 of the ball race tracks are held by curved retaining troughs 33 of channel shape in cross section. The inner edges of these channel walls embrace the shouldered outer portions of the lower track sections atforded by the outer portions of the nuts 30, hitherto noted.

The numeral 34 represents an annular track section mounted with freedom for sliding motion on thesleev'e 14, and recessed on its periphery to aflord seats for balls 35. The numeral 36 represents'outer track sections for co-operation with the inner track section 34, and this outer track is embraced by a curved trough-like retainer 37 of channel form in cross section, the inner flanges of which also embrace the shouldered outer-portion of the inner race track 34. The numeral 38 represents an open ended cylinder which serves as a pulley body and is swaged fast to the channel shaped curved troughs which house the two end ball race tracks shownvin Fig. 3 of the drawings. In other words, the cylinder 38 is swaged to the end trough. 33 and the end trough 37; and, it follows, of course, that the said cylinder or pulley body 38 will. turn with the said tracks on the said balls. The

said cylinder 38 is provided, at itslongitudi- Flg.

- and which respectively co-operate with coni-' cal pulley flanges 42 and 43 formed integral with the cylinder 38. The said cone 41 and the said pulley flanges 42 and 43 extend .en-

' tirely around the cylinder 38, and rotate and 446, which, respectively, engage the right therewith. Y

The numeral 44 represents a manual screw shaft provided with right and left screw threaded portions marked respectively 44a and left screw nuts 30 and 31;. and, it, of course, follows that when this screw shaft 44 is" turned, it will'move the nuts 29- and 30 in opposite directions and thereby cause the pulley sections to approach or separate from each other. Said screw shaft 44 1s held from longitudinal motion by a hand piece 45 of disk-like form removably fixed to the end of said shaft and reacting against balls 46 spring seated in a reaction block 47 of disklike form removably secured to the fixed non rotative sleeve 14. The end of the slotted sleeve 14 is filled by a filler block 14a fixed to the sleeve by screws 141), as shown in Figs. 3 and 5. This block 14a affords a bearing for the screw. shaft 44 and braces the on of the sleeve.

- Two round'belts are em loyed to connect the respective pairs of pul eys so far noted. These belts are shown in Figs. 1 and 2 of the drawings and marked, respectively, 48 and 49. The stud shaft 13 is adjustabl clamped to the upright bar 11 by a nut 13 engagm the screw-threaded end of said stud sha which extends through the slot 110 of said bar 11. This mounting of said stud shaft enables the same, and the counter .ulley thereon, to be .vertically adjusted for tightening the belts specified. The operation of the mechanismwhenever needed.

As illustrated, in the drawings, the ri h hand or outer section 21 of the delivery pul ey has secured thereto by screws 50a a stepped pulley 50 with flanges which cooperate with the outer surface of the pulley section 21 to afford three steps of different diameter for the application of transmitting belts, not shown. The said stepped pulley being in that location, is provided with a tool holding hub 51 to which any desired tool maybe secured in any suitable way. As shown, the hub is adapted to receive one end of a shaft 52 held therein by a jamb screw 53 and which, at its outer end, is shown in Fig. 1 as provided with an emery wheel 54.

The illustrated parts have now all been considered as an entirety, without much-reference to the details of the structure,-may be summarized as follows Assume that the motor is in action and driving its armature shaft at some predeterget I the sai' reduction of speed, as compared with the tions of the pulleys would be in the position shown in Fi s. 1 and 2 of the drawings. To arts into the position. there shown, it we have been necessary to take hold of the hand piece 45 of the screw shaft 44 and turn the same in such a direction that the sliding sections of the pulleys on the counter shaft would be separated from their cooperatin sections 'to the la est extent. If it'shoul be assumed that Fig. 3 shows the pulley sections of the counter shaft in what might be called a normal or neutral position, at which they would simp. transmit the speed of the armature sha t without any change therein, then it would be necessary to turn the worm shaft 44-clockwise to separate the sliding sections of the pulleys on the counter shaft and bring the parts into the ositions shown in Figs. 1 and 2. When t 's separation has taken lace, the primary belt 48 will be enga ed by t e co-operating flanges of the first pul ey of the counter shaft at the greatest available radial distance from the I axis of said counter shaft pulle and the co-operating flanges of the secon pulley on the counter shaft will engage the secondary belt49 at the shortest available radial distance from the axis of the secondary pulley on said counter shaft, and said secondary b'elt will engage the co-operating flanges of the delivery pulley at the greatest available radial distance from the axis of that pulley, thereby iving two reductions of the rotary motion rom the armature shaft. The lateral adjustments of the sliding members of the pulley flanges on the counter shaft are positively efl'ected'by the manually operated worm shaft; but, after this is done, the pull of the belts will make the necessary lateral adjustment of the laterall sliding members of the primary pulley an the delivery pul ley. In other words, these particular slidloo rections and thereby maintains alinement of the belts in relation to the and the'delivery pulley.

The belts 48 and .49 are of the same length and are not extensible. When the cooperating flanges of the first counter pulley are brought closer together by the manipulation primary pulley of the worm shaft, so as to make them engage the primary belt 48 at a greater radial distance from the axis of said pulley, the coopice crating flanges of the primary pulley, which of said worm shaft, the flanges of the priflanges on age the said belt at a greater radial,

mary pulley will be drawn nearer together under the pull of that belt so as to make said distance rom the axis of that pulley. The same remarks apply in substance to the coopcrating flanges of the second counter pulleyrelative to the secondary belt 49 and its effect on the cooperatin flanges of the delivery pulley; but these a justments take place in an order which is the reverse of the above named adjustments of the pulley flanges which engage the primary belt 48. In virtue of this compensatin action of the respective pairs of pulleys w ich engage the said

respective belts

48 and 49, the span of each belt is constant.

' So far in tracing the operation of the illustrated mechanism, the stepped pulley 50 has been ignored. It must be obvious, however, that the presence of this stepped pulley 50 enables the motion of the delivery pulley to be further changed by the a plication of a transmitting belt (not shown to a selected one of the three steps made available by the pres ence of that pulley. As already noted, the tool holder 51 is shown as formed on the hub of this stepped pulley 50..

With this pulley 5O taken into consideration, along with other parts of the mechanism,

it must beobvious that I have provided a rotary motion transmitter which will make many variations in the speed at which the rotary motion of the motors armature shaft may be transmitted to any point desired. It

must also be noted that the variations in the speed available from the two sets of flanged pulleys and the two belts cooperating with the said two sets of flanged pulleys may be finely graduated by the proper manipulation of the worm shaft 44.

It should be further noted that, if the mechanism be so designed that the neutral or normal point at which the cooperating flanges of the respective counter pulleys be midway of the possible radial adjustment available for the grips of the belts, then this mechanism may be utilized (a) to transmit the rotary motion of the motors armature shaft at the same speed, or (b) at a decreased speed, or'

the forms and proportions of the parts may be varied without departing from the spirit of my invention herein disclosed and claimed.

What is claimed is:

1. The combination with a primary shaft and a primary pulley turning therewith and a delivery pulley loose on said primary shaft, of a counter shaft having a pan of connected pulleys on a common hub loosely mounted on said counter shaft, all of which ulleys are conically flanged and diametrically dlvided and the sections of which pulleys may be lat-.

erally ad'usted'in respect to each other and a pair 0 belts, one of which connects said primary pulley with one of said two connected pulle s loose on the counter shaft and the other 0 which belts connects the other of said counter shaft pulleys to the delivery pula pair, of belts, one of which connects said primary pulley with one of said two connected pulleys loose on the counter shaft and the other of which belts connects the other of said counter shaft pulleys to the delivery pulley loose on the said primary shaft, and a stepped pulley mounted to rotate with said delivery pulley, substantially as described and for the I purposes set forth.

3. The combination with a primary shaft and a counter shaft spaced apart from each other, of a primary pulley fixed to said primary shaft and a delivery pulley loose thereon, a pair of connected pulleys on a common hub loosely mounted on said counter shaft, all of which pulleys have radially tapered belt-engaging surfaces, and allof which pulleys are diametrically divided into sections axially adjustable in respect to each other,

and two parallel, laterally adjacent belts, one of which connects said primary pulley with one of said two connected pulleys loose on the countershaft, and the other of which belts connects the other of said counter shaft pulleys to the delivery pulley loose on said primary shaft, substantially as described and for the purposes set forth;

4. A variable speed rotary motion transmitter comprising a primary shaft having a primary pulley fixed to turn therewith and a delivery pulley loose thereon, a counter shaft having a pair of connected pulleys on a common hub loosely mounted on said counter shaft, all of which pulleys have radially tapered belt-engagingsurfaces/and are diametrically divided', and the sections of which pulleys are laterally adjustable in respect to each other, manual means for axially adjusting the pulley sections on the counter shaft in respect to each other, and two laterally adjacent parallel belts one of which connects said primary pulley with one of said counter pulle"s, and the other of which belts connects the other of said counter pulleys to said delivery pulley on said primary shaft, substantially as described and for the purposes set forth.

In testimony whereof I afiix my signature.

CARL S. CARLBERG.