Патент USA US2120307код для вставки
June 14, 1938. D. R. BAKER ET AL DISPLAY DEVICE Filed Aug. 21, 1955 2,120,307 ' 2 Shéets-Sheet 1 @Ziz INVENTOR Donald H. Bake)’. Hang/Y F.’ Nordmark. ATYTORN EY June 14, 1938. D, R BAKER H M 2,120,307 DISPLAY DEVICE Filed Aug. 21, i935 '2 Sheets-Sheet 2 W '/' A INVENTOR _ ‘ Donald R?ahen Henry 1°. Hora’mark BY (YB ATTZRNEY 2,126,367 Patented June 14, 1938 UNITED STATES PATENT OFFECE 2,120,307 DISPLAY DEVICE Donald R. Baker, New York, N. Y., and Henry P. Nordmark, Grand Rapids, Mich., assignors to Kay Displays, Inc., New York, N. Y., a corpo ration of New York Application August 21, 1935, Serial No. 37,144 3 Claims. (Cl. 172—126) The invention relates to rotary display devices, and more particularly to new and improved actu ating means therefore. One object of the invention resides in the pro 5 vision of a device of the character described em bodying actuating means of high mechanical ef ficiency, low manufacturing cost and ready adaptability to display devices of varying sizes and operating characteristics. 10 It is yet another object of the invention to pro vide an actuator comprising a unitary structure including a prime mover, and an associated driv ing-connection adapted to communicate move ment from the prime mover to a display device, the prime mover and driving-connection unit, being adapted for ready attachment to a display device. Another object of the invention is the provision of a frictional driving-connection between a 20 prime mover and a display device, adapted to utilize the resistance to movement of the device to augment the frictional coefficient between the driving-connection and device. Other objects and advantages will be apparent 5 in the following description of a preferred em bodiment of the invention which has been se lected for illustration in the accompanying draw ings. It will be understood however, that many changes in form, construction and arrangement, may be made by those skilled in the art, without departing from the scope and spirit of the inven tion, as expressed in the appended claims. In the accompanying drawings; Figure 1 is a plan view of a display device embodying a pre ferred form of the invention, the display platform or turntable being removed to better illustrate the actuating mechanism therefor. Figure 2 is an elevational view of the device shown‘in Fig. 1, the turntable occupying its opera tive position and being partially broken away. Figure 3 is a vertical cross section taken on the line 3—3 of Fig. 1. Figure 4 is an enlarged perspective view of the unitary prime mover and driving connection I2 which additionally functions as a mounting for‘ an axial, and normally depending spindle l3. The spindle I3 is rigidly maintained in fixed relation with respect to the turntable, by a plural 01 ity of brackets M, which engage the spindle inter mediate its ends and extend radially outwardly, and upwardly, to points of attachment to the un~ der surface of the plate. The lower end of the spindle is adapted to be received in a step bearing 15, secured to the base I I, and a bearing bracket !6. likewise fixed to the base, and formed with a laterally extending bearing lug ll, serves to jour nal the spindle for rotation on a vertical axis. A circumferential apron I8, is secured to the pe 15 riphery of the turntable and projects downwardly therefrom into proximity to the surface of the base to shield the latter from View. A preferred form of actuator, comprising a unitary prime mover and driving-connection, is 20 shown as applied to a display device in Figs‘. 1 to 3 inclusive, the same unit being illustrated in a detached, enlarged perspective view in Fig. 4. The unit comprises generally, a prime mover H, a driving-connection 20, a prime mover control 25 switch 2|, and a common supporting frame 22. The prime mover, in this embodiment of the in vention, consists of an electro-magnet 23, the magnetic ?eld of which acts upon an armature 24, pivoted adjacent one of its ends to similar up 30 standing ears 25, formed on the frame 22. The free end of the armature is operatively con nected to a flywheel 26, by means of a link 21. The ?ywheel 26 is ?xed to a shaft 28 journaled in a vertical extension 29 of the frame. Referring now to Fig. 5, a spur gear 30 is non rotatably secured to shaft 28 intermediate the ?ywheel 26 and frame extension 29, and consti tutes the driving member of a gear train 30, 3| and 32. The gears 3|, 32 are carried on stub shafts 40 33, 34, journaled. in the side walls of a gear case 35, which in turn is operatively supported on shaft 28. The shaft 34 proiects externally of the side wall of the gear case to receive a fric shown in Figs. 1 to 3 inclusive. tion wheel 36 which is rigidly secured thereto. Figure 5 is an enlarged fragmentary sectional view of part of the driving connection of Figs. 1 1504 inclusive. will be seen that the gear case constitutes in ef feet, and is adapted to function a lever arm pivoted on shaft 28 and that its angular move Figure 6 is an elevational view of an alternative 50 form of actuating mechanism. I surface being reinforced by an underlying plate It ment is accomplished without disturbing the driv ing connection between the shaft and friction In the drawings, the invention is shown as ap plied to a rotary display device consisting of a turntable I 0, supported for rotary movement in a horizontal plane spaced above a base H. The wheel 36. The gear case is normally urged in a counterclockwise direction as viewed in Figs. 2 and 4, by means of a counterweight 31, carried on turntable, as illustrated, is circular in contour, its radially of shaft 28 in a direction opposite from 55 an arm 38 secured to the gear case and projecting 2 2,120,307 the case. Thus the friction wheel 36 is yieldably urged into driving engagement with a peripheral track 39, de?ned by a downwardly dished section of the plate 12. It will be observed that the track 39 is of sub stantial radial width so that the actuating unit terweight 31 and thereby increasing the fric tional coe?icient between the driving wheel and its track. The desired result may likewise be attained by reversing the above mentioned relative positions of the pivotal axis and driving Wheel, and caus may be attached to the base II, by means of a ing the latter part to rotate in a counter-clock wise direction. laterally extending frame ?ange 22a, through a wide range of distances from the rotary axis of 10 the turntable, thus permitting operation of the turntable through a comparatively wide range of speeds, with a single speed actuator. In addition to the functions previously enu merated, the shaft 28 operates to control a flow of current to the electro-magnet 23. To this end the shaft is ?tted with a cam 40, arranged to engage one arm 4|, of the switch 2| which is supported by, and insulated from, the frame 22. A second arm 43 of the switch 2!, likewise sup— ported by, and insulated from the frame 22, is provided with a contact point arranged to coact with a similar contact on the arm 4l, so that rotation of the shaft 28 will intermittently cause the respective contact points of the switch arms 4| and 43 to abut, thereby permitting a flow of current from a source of electrical energy to one terminal of the electro-magnet. In the present embodiment of the invention it is contemplated that dry cell batteries will be Generally stated, the invention comprehends any angular disposition of the lever arm, and 10 any operating characteristic of the friction driv ing wheel, in which the resistance to movement of the turntable reacts in such a manner as to cause the lever arm to tend to move into engage ment with the turntable, thus augmenting the 15 frictional coefficient between the wheel and table. With a view to economical construction and ease of maintenance, manual, rather than auto— matic starting of the prime mover is contem plated, and in this connection the above discussed principle of reacting forces is again ,utilized. Referring again to Figs. 1 and 2, it will be obvi ous that manual rotation of the turntable, in the direction in which it is driven by the friction wheel 36, i. e. counter-clockwise; will exert a 25 force opposite to force 54, at the point of con tact of the track 39 with the friction wheel. Such a force will exercise a downward component on current might likewise be employed. Referring to Figs. 1, 2 and 3, dry cell batteries 44, are sup ported upon the base II, and shielded therefrom the lever arm 20 thus tending to diminish the coef?cient of friction between the track and fric 30 tion wheel. It has been found in practice that this effect is so marked as to frequently necessi tate several successive manual movements of the turntable in a counter-clockwise direction before by trays 45, adapted to prevent such electrolyte the prime mover is set in motion. as may leak from the batteries from injuring the quence, after moving the master switch 50 to 30 utilized as a source of electrical energy, but it will be understood that an external supply of base. The batteries in this instance are connected in parallel, one with the other, by means of 40 conductors 45 and 41, and a conductor 48 estab lishes a circuit between the negative poles of the batteries and one terminal of the electro-magnet. A conductor 49, master switch 50, conductor 5|, switch arms 4| and 43 of switch 2|, and con 45 ductor 52, complete the circuit from the positive poles of the batteries to the electro-magnet. Referring to Figs. 4 and 5, the arrow 53 indi cates the direction of rotation of the friction wheel 36 which, from an examination of Fig. 2, 50 will be seen to have the effect of rotating the turntable in a counter-clockwise direction, as viewed in Fig. 1. Reverting again to Fig. 2, it will be apparent that the inertia, and frictional resistance to 55 movement of the turntable, will give rise to an opposed force of equal magnitude to that exer cised by the friction wheel at its point of con tact with the turntable; since for every action there is an equal and opposite reaction. This reacting force will be exerted tangentially of the friction wheel at the point of contact of the wheel with track 39, as indicated by arrow 54. By the application of well known principles of mechanics it will be seen that the force 54 will 65 be resolved into two or more components, one of which will act normally of the longitudinal As a conse 35 closed, or circuit making position, the turntable is preferably ?rst rotated in a reverse direction, i. e, clockwise, the tangential force exerted on the friction wheel assuming the same direction 40 as arrow 54 and thus having a component which tends to urge the friction wheel into driving en gagement with its track, to effectively communi cate movement to the prime mover. With the prime mover energized through rotation of shaft 45 28 and resultant actuation of switch 2 l, the flow ing current will tend to reverse its direction of operation, whereupon, a slight assisting counter clockwise thrust, applied to the table, will imme diately set the device in operation. 50 An alternative form of actuator is illustrated in Fig. 6 and consists generally of a rotary type motor 55 supported on an arm 56 of a bracket 51 pivoted at 57a on a pedestal 58. An arm 59 of bracket 57 carries a gear reduction unit 80 which serves to communicate rotary motion of the motor 55 to a friction wheel 6| adapted to engage the peripheral track 39. It will be observed that in this embodiment of the invention, the Weight of the motor functions to yieldably urge the friction 60 wheel into engagement with the track. It will be understood that suitable electrical connections will be made to the driving motor, and that a self-contained source of electrical energy such as the batteries of Figs. 1. and 3, or an external 65 supply of current may be employed. This con axis of lever arm 20 at the point of contact of struction, like that previously described, will be friction wheel 35 with track 39. Thus by posi tioning the pivotal axis 28 of the lever arm de seen to comprise a unitary structure including a prime mover and an associated driving connection adapted to communicate movement from the 70 prime mover to a display device. We claim as our invention: 1. In a device of the character described, in ?ned by gear case 35 to the left, (as viewed in Fig. 2) of the point of contact of the driving wheel with its track; and then causing the driv ing wheel to rotate in a clockwise direction, the reacting force will tend to rotate the lever arm upwardly, thus augmenting the action of coun cluding a turntable, the combination of a unitary turntable actuator comprising a frame, a prime 75 2,120,307 mover supported by said frame, a shaft journaled in said frame and operatively connected to said prime mover, a gear case pivotally mounted on said shaft, a gear train in said case arranged to be driven from said shaft, a friction driving wheel journaled adjacent the free end of said case for rotation on an axis parallel to said shaft and ar ranged to be driven by said gear train, a circuit connecting a source of electrical energy with said 10 prime mover, a switch in said circuit arranged to be actuated by said shaft to control a flow of current to the prime mover, and means tending to rotate said case to yieldably urge said friction wheel into engagement with said turntable. 15 2. In a device of the character described, in cluding a turntable, the combination of a turn table actuator comprising a frame, an arm pivoted on said frame for movement in a plane substan~ tially normal to the plane of the surface of the 20 turntable, a drive wheel operatively supported ad jacent the free end of said arm on an axis substan tially coincident with a radius of said table, a prime mover supported on said frame and ar 3 ranged to drive said wheel, and means to yieldably urge said wheel into driving engagement with said table. 3. In a device of the character described, the combination of a turntable supported for rotary movement in a horizontal plane, a frame, a lever arm pivoted below said table on said frame and extending laterally and upwardly toward the table in a plane normal thereto to de?ne an acute angle therewith, a friction wheel journaled ad 10 jacent the free end of said arm on an axis sub stantially coincident with a radius of said table for rotation in a plane parallel to the axis of said arm and normal to the plane of said table, yield able means to maintain said wheel in frictional 15 engagement with said table, and means on said frame to rotate said wheel in a direction to cause the resistance to movement of said table to exert a force tending to augment the action of said 20 yieldable means. DONALD R. BAKER. HENRY P. NORDMARK.