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Publication numberUS2035812 A
Publication typeGrant
Publication dateMar 31, 1936
Filing dateDec 12, 1934
Priority dateDec 15, 1933
Publication numberUS 2035812 A, US 2035812A, US-A-2035812, US2035812 A, US2035812A
InventorsOtto Janzen
Original AssigneeOtto Janzen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric hand lamp
US 2035812 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

. March 31, 1936.

o. JANZEN 2,035,812

ELECTRIC HAND LAMP Filed Dec. 12, 1934 Illlllllll J22 vezzior:

, the invention, 40

him have been pressed Patented Mar. 31', 1936 UNITED STATES. PATENT OFFICE E ili -3:1,, OttoJanzcmBcflImGermany Application December 12 1934. Serial No. 151,205 In Germany December 15, 1933 4 claim. (01. 240-105) toothed wheel into a movement of rotation of the dynamo. In such hand lamps the rotor has had a very high speed of rotation, particularly when the rotor has formed the magnet, with the induced winding arranged on the stator, With these dynamos, which are generally four-pole machines, either a very frequent or a powerful pressure has had to be' exerted on the operating lever in order to obtain the necessary Lwattage output, which has been Hand .lamps have also been proposed wherein the various compone is of the internal mechainto the two halves of an outer casing made of insulating material,

the two halves ofthe casing being provided with a screw-thread by means of which they are assembled together. In this case, however, there has been the disadvantage that any inaccuracies or defects caused in the internal mechanism during the assembling of the parts or subsequently, cannot be remedied. In dynamos used for hand lamps and driven by lever pressure, it has also already been proposed to retain the pressure lever in the position of rest by means of a locking device or the like.

The present invention has for its object to provide an improved construction of hand lamp operating by means of a small dynamo wherein the above disadvantages are overcome. In a constructipn of hand lamp according to the lamp comprises a small twopole dynamo which is formed as a unit independent of the lamp casing. According to a feature of the inventio {the said dynamo unit is resiliently mounted'in the lamp casing. Preferably, the unit is only connected to the by means of its shaft, so that it is pivoted about this shaft. By means of this construction, cthe transmission -of the noise of the machine or of the driving mechanism to the exterior isreduced and any irregularities in manuthe dynamo and casare also compensated for.

facture, such as between .I'he dynamo may be set in rotation by means a power lever operated by hand and preferably comprises a'tw -pole magnet as rotor, so as to obtain maximum steel masses for the pole pieces i found inconvenient in using the lamp for a long period at a time.

' wattage output can be obtained.

' which is described hereafter,

as an independent unit.

which are required for electro-magnetic sons, which pole pieces, as is well-known, each extend preferably over a quarter of the circumference of the rotor. This two-pole bar-shaped rotor is completed to form a circular mass by 5 means of a heavy non-magnetic metal, whereby air resistances are avoided in the dynamo and the centrifugal mass of the rotor is substantially increased; In order to obtain a permanent connection between the magnetic and the nonmagnetic parts of the rotor, the heavy metal mass is so aiilxed to the magnetic part, preferably by means of the spray casting process, that the bar-shaped magnet is embedded in the heavy metal without the latter forming a short-cirl5 cuit. The'construction of the dynamo as a twopolemachine' with a rotating magnet armature also permits a relatively large amount ofiron tobeusedforthestatorinthesmallspace available, so that even at low The low speed in turn otters the advantage that only a fewgear wheels are required for the transmission. between the operating lever and the rotor of the dynamo, and these wheels maytherefore be of powerful f construction, whereby a comparatively small force is sufficient to drive the dynamo.

The invention will bejmore clearly understood from the particular embodiment thereof by way of example, with reference to the accompanying drawing, in which:

Figs. 1 and 2 represent, in a partial section in front and, side views respectively, the dynamo a sectionthrough dynamo inserted in the Fig. 3 is a side elevation of the casing, showing the casing Fig 4 is a front view of the dynamo inserted 4m in the casing, with half of the casing removed.

. The two-pole stator i, preferably of laminated iron, carries on its yoke the induced winding 2 and on its faces the bearing bracket 3 for the rotor I, which is formed as a two-pole bar magnet and is completed by a heavy non-mag-f .netic metal M5, to form a completely circular disc. This non-magnetic metal is sprayed round the magnetic barin such a. manner that it completely surrounds the latter on three sides, while leaving the pole pie'ces free, but penetrates on one of the flat sides into dovetail-like recesses i in the'rotor 4, whereby a. firm connection is obtained in the radial direction whilst avoiding a shortcircuit. A'gear wheel 1 is fixed on the" shaft of sne da z eo rubber tube of suitable length.

As shown in Figs. 3 and 4, the lamp casing comprises two halves M made from press-ed insulating material, a bulb it being, provided in the usual way, having means it and H for connection to the winding 2. The single-armed operating lever lil is pivotally mounted on the axis id in one of the halves oi the casing. The am's it automatically moves outwards under the action of the spring 29, and the lever 58 is provided at its end with an arcuate rack it which meshes with the driving wheel 12 of the dynamo. In the rack 2!, is provided a recess 22 in which engages a pawl 23 which when pressure is exerted on the lever H8 in the position of rest, releases this lever under pressure of the spring 2%, and is provided with a locking memher (not shown) passing through the casing.

The connection of the dynamo to the casing is merely efiected through the-driving shaft Q which may be constructed either directly as a connecting screw for the two halves of the casing or as a hollow shaft through which passes a connecting screw. Further connecting screws or the like for the casing may be provided, for

instance, in the shalt It or at the point 25 at the upper end of the lamp. 1% shown in Fig. 3, the hollow shaft 9 may be threaded to" engage the threads of a member such as e which extends through the casing. One such screw 9' may be provided on each side and these will serve to hold the two halves of the.

casing assembled with relation to the contained mechanism. Owing to the above construction, the dynamo is pivotally mounted on the axis 9 within the casing and is resiliently held therein by the rubber lining l3. Substantially circular recesses may be provided in the two halves of the at the bottom, into which recesses are pressed parts of the rubber lining during assemblage, so as to prevent any swinging movement of the dynamo. This may also be assisted byprojections 26 provided on-the narrow sides of the casing. Any inequalities in the depth of the two halves or the casing or inthe overall height of the dynamo are compensated by the resilient mounting of the latterinfa manner which substantially simplifies the assemblage of thewhole. a

l br operation of the handlamp, the lever l8, which is locked by hand in the position of rest by means of the pawl 23, is pressed slightly harder than usual against the casing ll, so as to unlock it under the action of spring 2!, and

the level then springs outwards under the action of spring 20. By pressing the lever l8 down again against the casing, the rotor of the dynamo is set in movement by means of the rack 2| which connected to the lever i8 and through the wheel l2, coupling ll andv I gear wheels 8 and I to the rotor. The necessary wattage output is'thus obtained to operate the lamp fromthe dynamm. When the pressure on thalcver I 8 ceases the lever is again moved outforce is not reduced.

aoeaeia wards by the spring 20, the driving wheel I! of the dynamo reversing; since, however, the coupling l l is inactive in this direction, the further rotation of the rotorgxaused by centrifugal 1. In an electric hand lamp, the combination of a lamp casing, said-casing having a removable portion, a hand-operated two-pole dynamo mounted therein and formed as a unit independ- 'ent of said casing, said dynamo unit including a stator having an induced winding, a rotor comprising a two-pole bar magnet and a member of heavy non-magnetic material ed thereto and forming with said magnet a substantially circular mass, and adriving shaft for said rotor, said driving shaft coacting with said casing. to pivotally mount said dynamo unit therein and serving also as a means for holding the two portions of said casing together when assembled, and resilient means for positioning said dynamo unit in said casing.

2. In an electric hand lamp, the combination of a lamp casing, said casing having a. removable portion, and a hand-operated two-pole dynamo mounted therein and formed as a unit independent or said casing, .said 0 unit including a stator having an induced winding and a rotor comprising a two-pole bar magnet and a member oi heavy non-magnetic material amxed thereto and forming with said magnet a substantially circular mass, a bracket on said stator for carrying said rotor, and a driving shaft for said rotor, said driving shaft coacting with independent of said casing, said dynamo unit including a stator havingan induced winding, a rotor comprising a two-pole bar magnet and a member of heavy non-magnetic material atfixed thereto and forming with said magnet a substantially circular mass, and means for driving saidrotor comprising a driving shaft, a first gear wheel mounted on said driving shait,and

. a second gear wheelialso mounted on said shaft and coupled to said first wheel by a coupling member operative only in one direction or rota-' tion of said shaft, resilient means for positioningsaiddynamounitinsaidcasingaspring controlled hand lever on said casing, and means including an arcuate rack coactingwith second gear wheel of said dynamo unitand operated by said hand lever, Ior'converting the movement of said hand lever-into a movement of rotation of said rotor or said dynamo unit.

4. In an electric hand lamp, the combination.

of a lanip casing, said casing having a removable portion, a' hand-operated two-pole dynamo mounted therein and formed asa unit independent of said casing, said dynamo unit in cluding a stator oflaminate'dlron carrying an induced winding and a rotor comprising a twopole bar magnet and a member of heavy nonmagnetic material afllxed thereto and forming with said magnet a substantially circular mass, a bracket on said stator for carrying said rotor, a facing of resilient material on the outer faces of said bracket which coact with the internal walls of said casing 'to position said dynamo .unit therein, a driving shaft for said rotor, said driving shaft coacting with said casing to pivotally mount said dynamo therein and serving also as a means for holding the two portions of said casing together when assembled, a first gear wheel mounted \on said driving shaft, and a ,3 second gear wheel also and coupled to said first wheel by a. coupling member operative only in one direction of rotation of said shaft, a spring-controlled hand lever on said casing, means including an arcuate rack coacting with said second gear wheel of said dynamo unit and operated'by said hand lever, for converting the movement of said hand lever into a movement of rotation of said rotor of said dynamo unit, and a spring-controlled stop member for locking said hand lever in the position of rest.

O'I'IO JANZEN.

mounted on said shaft-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2424700 *Nov 11, 1944Jul 29, 1947Dayton Acme CoGenerator light
US2535041 *Feb 14, 1948Dec 26, 1950Jeny CorpBatteryless flashlight
US7361074Feb 18, 2005Apr 22, 2008Rapid Pro Manufacturing, Martin And Periman PartnershipRotating light toy
Classifications
U.S. Classification362/192
International ClassificationF21L13/00, F21L13/08
Cooperative ClassificationF21L13/08
European ClassificationF21L13/08