US1676285A - Riddle - Google Patents

Description

July 10, 1928. 1,676,285 H. PRELL RIDDLE July 10, 1928. I 1,676,285

H. PRELL RIDDLE Filed Dec. 51, 1923 a Sheets- Sheet 2 ZJ liz'y ll IIIIJIIIIIII/ I July 10, 1923. 1,676,285

H. PRELL RIDDLE Filed Dec. 51,. 1925 a: Sheets- Sheet 3 Patented July 10, 1928.

HENRY PRELL, OF CHICAGO, ILLINOIS.

RIDDLE.

Application filed. December 31', 1-923. SerialNo. 683,658.

This invention relates to improvements in riddles for screening or sitting sand in foundries, in building and for other purposes.

The objects of this invention are to provide means for agitating a riddle by centrifugal force; to provide an improved means for suspending the riddle so as to produce an effective agitation or vibration thereof; to provide an improved means for freely supporting'the riddle and a. motor therefor; to provide an improved stand or support upon which the riddle is adapted to be suspended, such standibeing readily mov able by the opera-tor; toprovide an improved suspension connection of the riddle upon the stand or support therefor; to provide an improved means for clamping the riddle itself in the suspended frame.

I Further objects. of this invention are to provide an improved shaft connection bemotor casing and at the same time permit on line 1010 of Fig. 7.

oiling of the motor without removingthe casingcover. [Other objectswill beapparent from the following descriptionand claims when considered in connection with the accompanying drawings. V v 1 Fig. '1, isa perspective view of my. improved device in its entirety; Fig. 2 is a sectional detail view of the riddle without its support; Fig. 3 is a sectional detail view of my improved bearing lfor the ends of the shaft; Fig. 4 shows a modified'form of supportpFigs. 5 and 6 are detai'l views of the shaft connection between the motor and the weight;'Fig. 7 is a sectional viewtaken on line 7-7 of Fig. 2 and shows av second form of support includingatrolley; Fig. 8 is a view taken on line 8+8 of'Fig. 2; Fig. 9. is a detail view take-non line 99 of Fig. 2; and Fig. 10 is a detail view taken The riddle itself, which may be of suitable construction, is here illustrated as corn prising the wire mesh bottom 1 which is supported between the lower hoop member 2 of wood or any other suitable materiajliand the upper hoop 3, the edge portion-0t the wire mesh being flanged upwardly as indicated at sand secured in position by means I of the outer hoop 5. The outer hoop is riveted to the other two hoops 2 and. Thewi-re mesh 1 may of course be of any grade or gauge desired. The hoop 3 is clamped at diametrically opposite points :be-

tween the jaws 6 and '7 by meansof the bolts 8 extending therethrough and the wingjnuts 9 which are adapted to bescrewed upon the bolts. I The. jaws '6 are provided upon the 1 lower extreme end portions of the suspension rrame indicated in a general way by refer ence' numeral '10, while the jaws 7 are piv'j- .otal'ly mounted at thep'oints' 11 Within the cut-out portions l2 provided in the lower part of theit'rame' 10. The leaf springs'13- are secured by -means 'ofthe screws 14 to the upper part of the jaws 7, and bear at their other endsagainst the inside face of the re .cesses 12, the tendency of these springs being to normally force the jaws 7 into opened or released position so as to permit removal of the riddle from the suspension frame. There I I I are'provided also the projections 15 onopposite sides of the upper part o-t' the jaws 6, as clearly shown in Figs. 2 and 7 for the purpose of limiting the upward insertion, of v the riddle between thejaws, thereby 'insnring proper clamping engagement of the hoop 3 between the aws. The inner faces of the jaws 6 and 7 are tor-med in-the manner as I substantially pyramid form as illustrated in the drawing.

The upper part of the suspension trame,

- ofwhich the legs 10 form 'the'lower'partis enlarged so as to provide'an integralcasing for enclosure of the operating motorl 1,8. The entire suspension frame including the motor oasing is made as a single casting preferably of aluminum so as to keep the ;clearly illustrated in Figs; 9and. 10 so as to motor cool by rapid radiation of the, heat developed- The aluminum "cover 19 of the place is greatly facilitated.

motor casing is detachably secured by means of the screw bolts and is provided with an apertured ear 21 for suspension upon the hook 22. The upper portion of the hook 22 extends through an apertured ring member 23 which is provided upon its upper marginal portion with radially extending grooves or serrations 24 to provide seating engagement for the cross bar 25 on the upper end of the hook 22. The annular ring member 23 forms part of a bracket 26 which is removably secured by means of set screw 27 on the overhanging end portion of the upright standard or support 28. An eye 29 is alse provided upon the one side of the bracket 26, such eye serving as a means for threading the electric wire 30 which has the socket connection 31 through the casing cover to the electric motor 13. The lower end of the standard 28 is adapted to rest upon the floor or ground where the riddle is being used and a three arm single casting 32 is secured to the standard 23 by means of the set screw 33, while the other two arms of the casting have secured therein by means of the set screws 34 the angular-1y disposed and downwardly extending pipes or rods 35 upon the lower end of which are mounted the rollers 36. Thus there is provided a three point supporting means, with the riddle it self supported at a point between the rollers and'the bottom of the standard 28. The handle 36 which is secured upon the standard 28 by means of the set screw 37 serves as a means of raising the standard from the floor so as to roll the entire device on the wheels or rollers 36 to the position desired, the riddle during this time being conveniently suspended at a point substantially above the rollers themselves. In this way the movement of the device from place to It will be seen also that by virtue of the free manner of suspension of the riddle upon its support, it can be readily swung about the hook 22 so as to dump the same without disturbing the rest of the device. I Fig. 4illustrates the con ncction of an extension rod 28 which may be connected to the support 28 by means of the sleeve 28" and sct'screws 28, and upon the outer end of which the bracket 26 may be secured, so as to suspend the riddle over the workmans bench.

The electric motor 18 is mounted upon the pads 38 provided in the bottom of the casing and the wire connection 30 to the motor is shown'in Fig. 2. The auxiliary shafts 39 extend in alignment with the stub shaft ends 40 of the rotor of'the electric motor and a yieldable connection is provided between the adjacent ends of the auxiliary shafts and rotor shaft ends so as to permit cooking or universal movement of the auxiliary shafts 39 as may be necessary due to inaccurate .seatingof the motor. Such yieldable connection comprises the collar 41 which is fixed upon the shaft- 39 by means of the set screw 42, and the collar 43 which is fixed upon the end of the rotor shaft by means of the set screw 44, these parts being so arranged that the extreme end port-ions of the auxiliary shafts 39 project into the collars 43 as clearly indicated in Fig. 2. There is also a slight clearance at all times between the adjacent ends of the shafts 39 and the shaft ends of the rotor. The collar 41 is provided with the arm 45 to which is secured at 45 one end of the strap 46 of leather or other suit able flexible material, the other end of which is secured at 43 to the collar 43. The leather connection 46 extends circumferentially of the axis of the shaft connection and there is a certaindegree of pivotal movement permitted at the points 43 and 45, so that the necessary degree of automatic adjustment is permitted without any noise. The motor shaft rotates in such direction that it pulls the auxiliary shafts with it. Upon the outer ends of the auxiliary shafts 39 are mounted the centrifugal weights 47 by means of the set screws 48, these two weights being placedat substantially180 with respect to each other uponthe main operating axis of the motor. Proper clearance is allowed bet-ween the weights and the ends of the casing so as to avoid chattering. These weights are preferably of substantially the same size, as illustrated in Fig. 2 of the drawing, although they may vary. The extreme end portions of the auxiliary shaft 39 are formed wit-h a double bevel as indicated at 49 and are provided with the ball bearing 50, the crest of the bevel end portions being on the center line of the balls 51 of the bearing, this being clearly indicated in Fig. 3. The ball bearing is supported within the suitably formed cap 52 which is clamped onto the ends of the casing by means of the screw bolts 53 so as to permit ready removal thereof. Between the ball bearing and the cap itself there is provided the felt packing 54 which is adapted not only to hold the oil for the bearing but also to serve'as a screen for keeping dirt and other foreign matter out of the bearing, the oil being supplied through the oil cup 55 which is threaded into the center portion of the cap 52..

The oil wells 56 on the ends of the motor are provided with the upwardly extending tubes 57 upon which are provided the en larged collar members 58. These enlarged portions 58 are adapted to receive by telescopic engagement the lower ends of the oil feed pipes 59 which are screwed into the casing cover 19 and extend therethrough to the outside as clearly indicated in the draw- 1 ings. In this wayit is possible to oil the motor without removing thecasing cover while at the same time it is possible also to vided'in the oil' feed means.

remove the casing cover whenever desired due tothe readily separable connection pro- Such orl connections are prov ded upon opposite sides In this way it is possible to open the closure andadjust the brushes without otherwise disturbing the motor or its enclosing casing.

The form of suspension shown in Fig. 7 is especially adapted for use upon a trolley track where it is desired to have theriddle moved overhead and over a considerable distance. In this case the annular serrated ring member 23 instead of being provided, as

part of a bracket. on an upright standard is provided as part of a closed loop member 62, theupper restricted portion being supported in the hook 63 which in'turn is carried upon the bracket 64 having the rollers 65 for rolling engagement with theoverhead track 66.

The electric rail- 67 supplies current to the wiping contact member 68 which is carried by the bracket contact 64: and which is in circuit with the electric line 69. The wire 69 is threaded through the loop member'62 and thence through the motor casing to the motor in the same manner as before dey scribed.

Operation of the motor sets up a centrif ugal force due to the opposed arrangement of the weights on the ends of themotor axis and such force will be transmitted through the freely suspended frame to the riddle. As this centrifugal force is effective throughout the full 360 of rotation of the motor shaft. there will be continuous vibration or agitation of the supporting-frame and the riddle in continuously changing directions. The center of such vibratory motion of the motor shaft will correspond approximately with the central point of the motor itself. In other words, referring to the position shown in Fig. 2 of the drawing, there will be a downward motion of the left hand end of the motor-shaft. and at the same time an upward motion of the right hand motion of the righthand end of the motor shaft; then when the shaft has turned through 180 there will be opposite motions from V the two ends of the shaft respectively and the directions of the motions of the two ends of the motor shaft will change continuouslv in such manner throughout the entire 360 of travel. Thus the effect of the centrifugal force is at one instant to vibrate the supporting frame and the riddle through a vertical plane, at another inst-ant to cause such vibration through a horizontal plane, and at other intervening instants to cause vibration tion; Moreover, the freely suspended Weight through "the many intervening planes. Thus there may be said to setup somewhato'f a gyrating-mot-ion. v By virtue of the f-reemanner of suspension of the supportingframe the vibratory motion is-effectively transmitted to the rid die and at the same timethe motor itself which is likewise freely suspended does not suffer any detrimental shock from {such moof the motor assiststhe vibrating movement by virtue of its momentum. Furthermore, with the presentarrangement inwhich the motor and'ot-her parts-are so suspended that the motor vibrates about its center, a minimum amount of power is required to produce the desired vibration of the riddleitself which is suspended at the other end of the suspension frame 10. I

What I claim is: y

1. Apparatus of the'character described, comprising a casing, amotor centrally disposed therein and having a horizontal shaft,

auxiliary shafts on either'end of said motor shaft in substantially aligned driven relation therewith and having bearings in said casing, a weight carried by each of said auxiliary shafts and unbalancedtherefrom, depending arms on said casing adapted to support an element .to be vibrated in unison with said casing, andmeans for suspending said casing.

2. Apparatus of the character described,"

comprising a casing, a motor centrally disposed therein and having a-horizontal shaft, auxiliary shafts on either end of said motor shaft in substantially aligned driven relation therewith and having bearings in said casing, a weight carried by each auxiliary auxiliary shaft and unbalanced therefrom,

dependingarms on said casing adapted to support an element to be vibrated in unisonwith said casing, said auxiliary shafts and said arms lying in substantially the'same general I plane, and means for suspending said casing. V

4:. Apparatus of the character described, comprising a casing, a motor centrally disposed therein and having a horizontal shaft, auxiliary shafts on either end of said motor shaft in substantially aligned driven relation therewith, each auxiliary shaft being in supporting engagement at its inner end with 115 ends of said casing, a. weight carried by each an end of said motor shaft and bearing at its outer end in said casing, a Weight on each auxiliary shaft adjacent the bearing thereof in the casing and unbalanced on the shaft, depending arms on said casing adapted to support an element to be vibrated in unison with said casing, and means for suspending said casing.

5. Apparatus of the character described, comprising a casing, a motor cent-rally disposed therein and having a horizontal shaft, auxiliary shafts on either end of said motor shaft in substantially aligned driven relation therewith, each auxiliary shaft being in supporting engagement at its inner end With but angularly movable With respect to an end of said motor shaft and at its outer end bearing in said casing, a Weight on each auxiliary shaft adjacent the bearing thereof in the casing and unbalanced on the shaft, depending arms on said casing adapted to support an element to be vibrated in unison with said casing, and means for suspending said casing.

In testimony whereof I hereby affix signature.

HENRY PRELL.

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