US1644277A

US1644277A - Lamp for instrument boards of motor vehicles

Info

Publication number: US1644277A
Application number: US40881A
Authority: US
Inventors: Rodanet Charles Hilaire Henri
Original assignee: ED Jaeger SA
Current assignee: ED Jaeger SA
Priority date: 1925-02-17
Filing date: 1925-07-01
Publication date: 1927-10-04
Anticipated expiration: 1944-10-04

Description

I 1644,277 -4 2 I x c. H. H. RQDANET LAM FOR INSTRUMENT BOARDS OF MOTOR VEHICLES, Fi led Julyl, 1925 Patented Oct. 4, 1927.

UNITED ST TES.

CHARLES HILAIRE HENRI IEtODANET, OF VERSAILLES, FRANCE, A SSIGNOR 'TO sooin'rn ANONYME ETABLISSEMENTS ED. JAEGER, or

COMPANY.

Application filed'July 1, 1925, Serial No.

Lamps are already known for the instrument board for a motor vehicle inwhich an electric lamp is located in a tubular casing formed with slots for the passage of light and furnished with a reflecting surface. The reflecting surface is conical with its axis coinciding with that of the lamp casing which carries it'and the summit of the cone is directed towards the lamp, the slots in the 19 casing being cut in the-upper part thereof in such a Way that the light rays passing therethrough are all received by the conical surface and reflected on the instrument board. V I

The present invention relates to improvements of the lamps and essentially consist in constructing and arranging the hood which covers the lamp and which is formed with the openings for the passage of the direct 20 light rays, and carries the conical reflecting surface so as to constitute the switch of the electric circuit feeding the said lamp. For that purpose, the hood is connected to one of the lamps, so as to make or break contact 26 with a contact piece, which, through the filament of the lamp, is connected to the other terminal of the said circuit.

Fig. 1 of the accompanying drawing shows in vertical section a lamp embodying 3c the present invention.

Fig. 2 is an elevation of the hood covering the lamp.

The lamp a is mounted in a socket Z) secured on the bottom 0 of a, metal casing d which passes through the instrument board 6. This casing 03 bears on the latter through its flange g and is secured in position by the washer f screwing on its screw threads. Between the instrument board and the washer f is clamped the connection 70 for the ground wire.

The reflecting surface j, which is terminated by a milled ledge 9' is secured to a cap or cover al in the bottom of which are provided openings i permitting the passage of the direct light rays issued from the source a. This cap or cover al carries a sleeve part Z longitudinally slotted for presenting a certain elasticity (Fig. 2) one of the edges of this slot is also provided with a notch m which engages with a finger it carried by the fixed casing (Z and its inward movement is limited by the ledge of the cap or cover (Z resting on the flange g. In these ing (Z.

PARIS, FRANCE, A FRENCH LAMP FOR INSTRUMENT BOARDS OF MOTUR VEHICLES.

40,881, and in France February 17, 1925.

conditions and as shown in Fig. 1, the lower end of the slotted sleeve Z is held at a certain distance from the bottom of the fixed cas- Between the bottom '0 of the casing and the bottom of the socket b is arranged a re.- silient blade at the free end of which is curved upwardly (Fig. 1). Thisblade u is in contact with the socket b but is electrically insulated from the bottom 0 of the casing (Z by a washer 0, the washer on which bears the upper part of the spring being made of insulating material. By angularly moving, the milled ledge y" provided on'the reflecting surface j, the cap-(Z? and sleeve Z are turned relatively to the casing (Z, and it is therefore possible to engage or disengage the said sleeve Z with the resilient blade 14, the positions of contact or noncontact being defined by the engagement of the ends of the notch m with the fixed finger at.

In these conditions, when the sleeve Z is in contact with the resilient blade u, the electric circuit is closed through the lamp (1, socket 6, blade 14, sleeve Z, casing d and washer f on the body connection it. It is obvious that when the contact is broken, the circuit of the lamp is also broken.

The arrangement indicated might also be applied in'the case of a lamphaving two contacts.

The arrangements described present, moreover, the advantage of permitting the extraction of the sleeve Z and cap d which cover the lamp a, the latter as well as the socket 6 remaining however secured on the instrument board a. It is thus possible, without other dismantling, to change the lamp a, or if necessary, to mount in the socket Z) a plug for feeding a hand lamp.

What I claim as my invention and desire to secure by Letters Patent is:

1. In an electric lamp for instrument board of motor vehicles, a cylindrical member surrounding and supporting the bulb and having openings in the top thereof,a conical reflector, external to said member, cooperating with the said openings for receiving and reflecting the rays emitted by the source of light-,-a metallic casing secured in the instrument board for internally receiving the cylindrical member and the socket supporting the bulb.

2. In an electric lamp for instrument board of motor vehicles a cylindrical member surrounding and supporting the bulb and having openings in the top thereof,a conical reflector, external to said member, cooperating With the said openings for re ceiving and reflecting the rays emitted by the source of light,a metallic casing secured in the instrument board for internally receiving the'cylindrical member and the 7 socket supporting the bulb,means for puttingthe source of light in and out of ac tion.

'3. In an electric lamp for instrument board of motor vehicles, a cylindrical member surrounding and supporting the bulb and having openings in the top. thereof,-a conical reflector, external to said member, cooperating With the said openings for receiving and reflecting the rays emitted by the source of light,a metallic casing se-' cured in the instrument board for internally receiving the cylindrical member and the socket supporting the bulb,-a central resilient contact passing through the bottom of the casing supporting the bulb,an insuj lated resilient blade, connected to the said casing,and means permitting putting the said resilient blade in and out of contact with the cylindrical member surrounding the bulb.

4. In an electric lamp for instrument board of motor vehicles a cylindrical member surrounding and supporting'the I bulb and having openings in the top thereof,-a conical reflector, external to said member, cooperating With the said openings for re ceiving and reflecting the rays emitted by the source of light,a metallic casing vSecured in the instrument board for internally receiving the cylindrical member and the socket supporting the bulb,-- a central resilient contact passing through the bottom of the casing supporting the bulb, an .insu-i lated resilient blade, connected to the said.

CHARLES HILAIRE HENRI RODANET.