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Publication numberUS1591627 A
Publication typeGrant
Publication dateJul 6, 1926
Filing dateSep 20, 1922
Priority dateSep 20, 1922
Publication numberUS 1591627 A, US 1591627A, US-A-1591627, US1591627 A, US1591627A
InventorsHopkins Nevil Monroe
Original AssigneeNat Carbon Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Handlamp
US 1591627 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

July 6 1926.

N. M. HOPKINS HANDLAMP Filed Sept. 20, 1922 2 Sheets-Sheet 1 July 6 1926.

N. M. HOPKINS HANDLAMP Filed Sept. 20, 1322 2 Sheets-Sheet 2 Patented July 6, 1926.

UNITED STATES PATENT OFFICE.

HANDLAMP.

This invention relates to battery operated hand lamps and particularly to that type in whlch a head member, carrying a lamp bulb, is adjustable upon a tubular casing.

The principal object of the invention is to simplify the construction of such devices so far as is consistent with efiiciency and ease of IoIperation.

and lamps manufactured according to the preferred form of the present invention consist of an integral tubular casing having an apertured bottomof special form, a lamp-carrying head adjustable upon the casing, and resilient means between the lamp and a battery contained in the casing, the circuit, through the lamp being controlled by adjustment of the head. In the accompanying drawings:

Fig. 1 is a vertical section through the improved hand lamp, showing the battery cells in elevation;

Fi 2 is a similar view, showing a modified orm of resilient means;

Fig. 3 is a view similar to that of Fig. 2, the lamp being shown in operative position;

Fig. 4 is a vertical section through a hand lamp having a non-conductive casing; and

Fig. 5 is a perspective view of the conductor strip used in the device of Fig. 4.

Referring to Fig. 1 of the drawing, numeral 1 denotes a casing having a bottom 2 integral therewith. Casing 1 is preferably made from sheet brass or aluminum stamped or drawn into the desired shape, but the invention is not limited to casings made from these metals nor to any particular method of metal working. Aametallic head member 3, preferably shaped to form a reflective surface 4, is screw-threaded to engage cooperating threads at the upper portion of easing 1. A lamp bulb 5 is received by a threaded central socket 5- in reflector 4. A coil spring 6 is under compression between the base of the reflector and the top of battery cell 7. The s ring encircles'the carbon pole of that cell but 18 well spaced from it to prevent the possibilit of contact. The casing bottom 2 1s provi ed with an aperture 8 defined by an upstanding wall 9 having a relatively sharp edge presenting a substantially level support upon which the zinc base of cell 10 rests. The zinc cups of cells 7 and 10 are jacketed in paper or are otherwise suitably protected from contact with the casing wall. A fiber washer 11 may be placed on the top of cell 7 to prevent the possibility of the spring cutting into the seal or coming into contact with the zinc wall of the cell.

The circuit through the lamp 5- is closed and opened by screwing the head member 3 in and out, respectively. hen the head is turned outwardly from the position shown in Fig. 1, the inner terminal 12 of the lamp is moved out of contact with the carbon pole of cell 7, and this spaced relation is maintained by the action of spring 6. The thrust of the spring against the head member is sufiicient to insure its remaining in adjusted position.

One of the important advantages of the present construction is the means for making contact with the base of the lowest bat-- tery cell. The upturned sharp edge of wall 9 scores or abrades the zinc to a suflicient extent to insure clean metallic contact at all times, and the wall provides an integral path by which the current may pass to the casing. A permanent low-resistance connection is thus obtained in a very simple manner.

.A further advantage of the construction just described is that the aperture 8, formed by striking up the casing bottom to provide the contact wall 9, permits the easy ejection of the cells. If the cells become bound in the casing they may be readily displaced by inserting a rod, a pencil for example, through the aperture. Also, the top edge of the wall 9 supports the battery squarely in the casing, thereby reducin the tendency of the battery to fit obliquely in the casing and become bound therein.

In the form of the invention shown in Figs. 2 and 3, the construction difi'ers from Fig. 1 only in the substitution of a resilient. non-metallic member for the coil spring 6. The resilient member may be a rubber tube 13 placed between the reflector 4 and the top of cell 7. When the lamp is not in use, the tube 13 spaces the opposed lamp and battery terminals (Fig. 2). When the head member 3 is screwed inwardly to bring the lamp into operative position (Fig. 3), the

tube is compressed or bowed outwardly and exerts a pressure upon the head suflicient to hold it in adjusted position.

It is possible to dispense with resilient 1 members. The slight freedom of movement mice path from cell 10 to of the battery,

spring, are not sufficiently extensive to give" rise to destructive impact upon the lamp. However, the resilient members 6 and 13 have useful functions, as above pointed out, and will usually be employed.

Figs. 4 and 5 illustrate an embodiment of the invention in which a non-conductive casing 14 is used. A metallic strip 15 carries the current from cell 10 to the outer lamp terminal. The strip is bent at its ends to provide arms 16 and 17 extending at right angles to its body portion. Arm 16 passes through a slot 18 in the resilient tube 13, and has an upturned end 19 held by the tube against the metallic reflector socket 5. Arm 17 extends beneath cell 10 and is punched to provide the upstanding wall 20, upon which the zinc bottom of the cell rests. A clean zinc contact surface is maintained by engagement of the edge of wall 20 with the cell bottom, in the same way as in the devices of Figs. 1 and 2, and a low resistthe lamp is provided at all times. The strip 15 may be held in position by the cells and resilient tube 13 or may be secured to the casing in any suitable way.

I am aware that it has heretofore been proposed to construct flashlights with spring-pressed head members ad uStable to regulate the circuit through the lamp, and I claim this construction only in combination with the other advantageous features of the present invention. The devices illustrated herein are preferred forms capable of being modified with respect to various details of construction without de arting from the invention as defined in t e appended claims.

I claim 1. In a hand lamp, a casing containing 9.

battery provided with a contact surface, a closure for one end of said casing, an aperture in the closure for introducing a rod to eject the battery, and an upstanding member having a narrow marginal portion encircling said aperture and positioned between the closure and the contact surface, said upstanding member being in electrical connection with one terminal of the lamp.

2. In a hand lamp, a casing containing a battery provided with a contact surface, a closure for one end of said casing, an aper ture in the closure for introducing a rod to eject the battery, an upstanding member having a narrow marginal portion encircling said aperture and positioned between the closure and the contact surface, said upstanding member being in electrical connection with one terminal of the lamp, and resilient means arranged to press the con- Eact surface against said upstanding mem- 3. In a hand lamp, a casing containing a battery provided with a contact surface, a closure for one end of said casing and integral therewith, an aperture in the closure for introducing a rod to eject the bat tcry, said aperture having a raised marginal portion, and resilient means arranged to press the contact surface of the battery against said raised marginal portion.

4. In a hand lamp, a casing containing a battery provided with a contact surface, a closure for one end of the casing bearing an upstanding member in circuit with the lamp, said member having a sharp edged annular portion pressed against the contact surface of the battery, whereby the contact surface is abraded to insure good contact but the pressure against the contact surface is distributed to avoid rupturing the battery.

In testimony whereof, I afiix my signature.

N. MONROE HOPKINS.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2518437 *Aug 23, 1947Aug 15, 1950Butler BrothersFlashlight
US2665498 *Jun 24, 1950Jan 12, 1954Mitchell Edward CElectro plumb bob
US4041304 *Jan 22, 1976Aug 9, 1977Samuel SpectorFlashlight
US4473943 *Sep 28, 1982Oct 2, 1984Sotirios PapanikolaouIlluminated razor
US4725932 *May 14, 1986Feb 16, 1988Gammache Richard JMiniature flashlight
US4875146 *Aug 20, 1986Oct 17, 1989Duracell Inc.Flashlight bulb mounting
US6679616 *May 7, 2001Jan 20, 2004Mocap, Inc.Miniature flashlight and key chain
US6908209Jan 13, 2003Jun 21, 2005Mocap, Inc.Miniature flashlight and keyholder
US7083299Aug 19, 2004Aug 1, 2006Chapman/Leonard Enterprises, Inc.Flashlight having convex-concave lens
US7147343Mar 25, 2003Dec 12, 2006Chapman/Leonard Studio EquipmentFlashlight
US7152995Dec 16, 2004Dec 26, 2006Chapman/Leonard Enterprises, Inc.Flashlight
US7396141Apr 24, 2006Jul 8, 2008Chapman/Leonard Enterprises, Inc.LED push rod flashlight
US20040190286 *Aug 19, 2003Sep 30, 2004Chapman Leonard T.Flashlight
US20040190299 *Mar 25, 2003Sep 30, 2004Chapman/Leonard Studio EquipmentFlashlight
US20050088843 *Aug 19, 2004Apr 28, 2005Chapman Leonard T.Flashlight
US20050099805 *Dec 16, 2004May 12, 2005Chapman/Leonard Enterprises, Inc.Flashlight
Classifications
U.S. Classification362/203, 429/97, 43/17.5, 362/208
International ClassificationF21L4/00
Cooperative ClassificationF21L4/00, F21L15/06
European ClassificationF21L4/00, F21L15/06