US1820967A - Toy motor - Google Patents

Description

Sept. 1, 1931. 1.1:..ENYEART 1,320,967V

TOY MOTOR Filed NOV. 24. 1930 dumm,

Patented Sept. 1, 1931 PATENT "oFFlclai-Wy JAMES '13". ENYEART, OF DENVER, COLORADO TOY MOTOR Application filed November 24, 1930. Serial No. 497,660.

" This invention relates to improvements in motors and hasreference more particularly toan'improved motor for toys. y

l Intheconstruction of toys of the mechanififl cal typey and especially oaeroplanes and toy vehicles, itis necessary ,for the best results to khave a motorthat Willrun as long a time as possible and to develop a substantially con stant torque. during its Whole operation.

w When spring motors are used,the spring eX- erts a decreasingforce, as it is being un .Wound andy towards vthe last it becomes very Weakl With,y the result that the mechanism stops long before the spring is ully unwound.

` y It is theobject of this invention to produce ya motor thatshall be of such design that Ait vvilltake' uprvery little room and which shall beoperated byL elasticy bands, such as india rubber bands and which` shall be so 'i 122! y. constructedand designed that it will deliver substantially the same ktorqueV during its en.

tire operation.

This invention, briefly described, consists f of a rotatable driven member and a rotatable '257 anchoring device. Arubber band has one endf'fastened to the driven member and the other to the anchor and is Wound about the .v driven member lin extended form and isalso vvWound about the anchorY under tension, thev i '30 tension in that part of the band that is Wound f' about the driven member being greaterfthan f the tension of that portionof the rubber band that is Wound about the anchor. The anchor andthe driven member are so related ythat "pi3v5'yvhen the motor operates, the peripheral velocity of the driven member` isI greaterthan that 'of they arieh-orV` and .therefore when thek rubberrfband is unwound from the driven member and onto the-anchor, the ktension Will i 40 bedeereased .and held substantially constant during the entirel operation of ythe motor, kkwhereby a substantially constant torque Will be deliveredby the motorduring yits entire period of operation.

145. Having'v thus briefly described the inven! tion, the same will novvbe described indetail, y and forthis purpose reference Will bey had to y the 'accompanying' dravvingsin which the pre- Aferred:"embediment of the invention has been rr` illustrated, andjin which :'72

`icormkof my improved motor;

Fig. 2 is a section take-n on line 2-2, Fig. 1, and shows the position of the parts when the motor is in run-down condition; Y e 55 Fig. 3 is a section taken on line 3--3, Fig l, and shows one end of one of the bands secured to the anchor; and

Fig. 4t is a top plan view of a modified forni of the motor. i y 60 In the drawings reference numeral 1 desig nates the base which has been shown as a piece of board, to the ends of Which the metalvbrackets 2 and 3 are secured. These brackets may be secured to the ends of the base by means 'ot screws 4, and are each provided with three" openings that form bearings for the rotatable driven member 5 and the tivo anchors 6. One end of the driven member is provided vwith a pinion 7 and the corresponding ends of the. 70L anchors are provided with gear Wheels 8 that` mesh with the pinion in the mannerl shown in Figs. 1 and 2. y

It Will be seen from Fig. 2 that gears 8 are of larger diameter than the pinion 7 and it ,75 the driven member and the anchors have the same diameter their peripheral velocity Will be different because the driven member Will rotate at a greater angular velocityfthan the anchors due to the gear ratios. The difler-` so ence in rotation may beydiilerentfordierent types ot motors and since this is optional, no

i specific ratio will be used in this description because it is sutlicient for an understanding of the device to explain that they peripheral velocities of the'anehor's are less than that of the driven member. In order to simplify the fdrawingsand the description, a propeller 9 lrubber' band 12 extends through thi-s opening and the ends of this rubber band are secured to the anchors at points 13. Although I have shown a single band and shown it extending through an opening 11, l want itdistinctly understood that the band may be made with p chor-s ,with `a certain amount of tension, the

two parts and fastened to the driven member in any other way. In constructing the motor the rubber band is first wound about the anexact amount of tension being immaterial Ywith this exception, that it should not be very much under tension when the motor is first constructed. After the ends of the rubber band have been wound about the anchors and fastened to thel latter at points 13, a crank like that indicated by dotted linesat 14 'is appliedto the shaft of one `of the anchors and Y the-motor rotated in 'such a ldirection as to unwind the rubber Aband from the anchors andwind them'onto the driven member. Due

. to thel fact that the driven'V member rotates lfaster than lthe anchors, the rubber vband will bevk stretched to a greater extent on the driven Y.the rubber bandbetween the drivenmember andthe place where it contacts with'the rotatable anchors is constantly under Vtension and this*l tension is substantially constant p dr'iring the entirei'mwinding of the rubber band fromthe driven member and therefore the motor has a substantially constant torque during the Ventire'period of its operation.

InvFig. the rubber bands have been'shown as fastened tothe anchors at the end opposite from that where the band is fastened to theV drivenmember,.but it is possibleto fasten the ends of th'erubber band to the anchors near the gear wheel-sand towrap two turns of rubber bands about ythe anchors and inthis Y'the length of rubber band'can 'be dou! bled., lt is Yalso possible to have more than ft'wo layers of rubberl band on the y anchors when the motor is run down and therefore the length of rubber band employed can be increased to almostany extent desired without Y elf'ecting the operationof the motor. F or the 'purpose'of illustratioma single layer Vof rubberbands on the anchors makes the operation clearer .and the drawings has therefore been vshwowni'inr that wav.`

The distinctive feature underlying the motor that forms the subject of -this invention is that 'there is a rotatable driven member about which arubber band can be wound under tens-ion and an anchor-to which the 'other end of the rubber band secured` and means oner'atfed by the rotation of the driven member for'increasing the distance along the 'band t from the driven member to the point where it is connected withtheV anchor.

The desired operation can be most easily attained means of a rotatable anchor of the type shown in Figs. 1, 2 and 3 and either one or a larger number of rotatable anchors can be employed, as the number of anchoring` devices Vand the number of elastic bands employed is immaterial, and is controlled by the amount of. power that the motor is to supply.l

In Fig. 4 I have shown a somewhat different embodiment of the invention. In Fig.

'4 the base has been designated by reference tion 181.' This band passes abouta pulley' 2O located to one side of Vthe rotating mem- Vber';y when the rotatable member is turned,

the peripheral velocityy of section 17 will a yrubber bandl is wound about ysection 18 under tension andi-has oneV end secured to 'the section 17 at 21, then when fthe member :be greater than that of section v18,r due to the different diametersof these two sections. 1f

will continueto rotate in such a direction'as to wind the band about vsection 18'fandunwind it from section 17. i Due 'to the arrangement of the parts*` and their proportion, the tension inthe band betweenthepoints where it contacts with the surfacesof sect-ions 17 j and 18 remains substantially constant during the entire operation of Vthel motor and the latter therefore i deliversy a substantially consta-nt 'torque' through Vits' entirej operation.`

From the :above description it will be'fseen that have produced almotorl of a simple construction 'that employs as its motive power an elastic band which has one end secured to a rotatable driven member and the other to a rotatable "anchor and which is provided with means lfor rotating the anchor whenever the drivenmembe'r Iisrotated and in which the peripheral velocity of the driven memberis greater than that ofthe, anchors 'whereby the tension of the' 'elastic *bandV will be greater where it is wound about` the driven member than whereit is woundV about the anchor, 'thereby producing Ia' device in which the tension in the'rubber'band'betweenv the driven member and the anchor remains substantially constant during the entire operation of the motor.

Having described the .invention What is claimed as new is:

A motor comprising a single elongated rotor mounted for rotation about its longitudinal axis, said rotor having two oy lindrical sections, an elastic band having its ends connected With the cylindrical sections,

Y one end to each section, and avpulley located to one side of the rotor and mounted for rotation about an axis substantially perpendicular to the axis of the rotor, the elastic band passing over the pulley which serves to guide it from one cylindrical section to ythe other.

In testimony vvhereof I aiiix my signature.

JAMES ENYEART.

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