US1331813A - Headlight - Google Patents

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Publication number
US1331813A
US1331813A US121296A US12129616A US1331813A US 1331813 A US1331813 A US 1331813A US 121296 A US121296 A US 121296A US 12129616 A US12129616 A US 12129616A US 1331813 A US1331813 A US 1331813A
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US
United States
Prior art keywords
headlight
screen
prisms
series
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US121296A
Inventor
Ralph H Holman
Francis D Shenk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEGALITE Corp
Original Assignee
LEGALITE CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US6710515A external-priority patent/US1224421A/en
Application filed by LEGALITE CORP filed Critical LEGALITE CORP
Priority to US121296A priority Critical patent/US1331813A/en
Application granted granted Critical
Publication of US1331813A publication Critical patent/US1331813A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Definitions

  • This invention relates to headlight screens and particularly to the arrangement of adapted allel beam ofa headlight reflector to depress tribute the light satisfactorily along the a lllVlSlOIl or continu'ation of application, filed, Dec. 16, 1915, now Patent No.
  • plish this object generally by an arrangement of transverse prisms on the. glare screen which forms the front of a headlight, treating; the upper part of the beam with the angles of'which have a progressively increasing depresser function from the vtop toward the center and treating the lower part of the beam with series of prisms having angles v decreasing from the center toward the bottom, so
  • I Fig, 3 is a central a screen.
  • a lamp of the'usual type consisting of a shell 1 and a bulb'2 with a screen 3.
  • a refractive screen for a comprising a For this purpose 5 or even less- The exact degree of tions of the screen reversed in the maximal-.
  • the screen 3 consists of a circular thelower face decreased from the centransverse prismatic elements inothe upper transverse and, lower portions thereof 'having an op sitely progressiveangular gradation relative to each other, and an intermediate zone of risms o1- uniform angularity.

Description

R. H. HOLMAN AND F. D. SHENK.
HEADLIGHT. APPLICATION FILED SEPT. 20, 1916- I 1,331,813. Patented Feb. 24,1920.
/ RALPH H. HOLMAN, F STONEHA .ori g'i nal application filed December 16, 191 5, Serial No. 67,105.
. roadway, being in effect 1,224,421, issued May 1,1917.
series of prisms,
' the same below the "UNITED STATES PATENT OFFICE.
SETT S, ASSIGNOBS TO THE LEGALITE A CORPORATION OF MASSACHUSETTS.
M, AND FRANCIS D.- SHENK, MEDFORD, MASSACHTI- CORPORATION, 015 BOSTON, MASSACHUSETTS,
HEADLIGHT.
Specification of Letters Patent. 1 Patented Feb, 24, 1920.
Divided and this application filed S eptember 20, 1916. Serial no. 121.296.
of Middlesex, Commonwealth of Massachu setts, and Medford, .county of Middlesex, Commonwealth ,of Massachusetts, have invented certain new and useful Improvements in Headlights',of,w-h1ch the following is a specification.
This invention relates to headlight screens and particularly to the arrangement of adapted allel beam ofa headlight reflector to depress tribute the light satisfactorily along the a lllVlSlOIl or continu'ation of application, filed, Dec. 16, 1915, now Patent No.
plish this object generally by an arrangement of transverse prisms on the. glare screen which forms the front of a headlight, treating; the upper part of the beam with the angles of'which have a progressively increasing depresser function from the vtop toward the center and treating the lower part of the beam with series of prisms having angles v decreasing from the center toward the bottom, so
' that that portion of the upper part of the part of nation of the roadway.
beam lying nearest the center and of the greatest area is more depressed than the small area of the upper edge while the lower the beam is manner. The central prismsare preferably of'a uniform small angularity. in this manner maximum neutralization of the tendency of the lamp to glare and at the sametime secure a very uniform illumi- The construction and operation of our device will specification which trative embodiment is shown in the accompanying drawing, in which Figure 1 is a front elevation oi a prisv matic screen,
glare, level and tO dlS-r- Serial No. 67,105,v
'lVc accomtreated in the reverse.
We securebemore fully described in the follows and an illus- Fig. 2 is a central section through a lamp I equipped with the same, and
I Fig, 3 is a central a screen. I
In theform of our invention herein illustrated, we provide a lamp of the'usual type consisting of a shell 1 and a bulb'2 with a screen 3. glass disk rovided with means for lateral light distribution and having on its rear face a series of transverse horizontal prisms. Beginning at the upper edge of th lamp where the first prism is short, we in ke the succeeding prisms of slightlyincreasingaugula'rity, for example, the first six prisms beginning at the top are respectively of 5, 6, 6%, 7, 7% and 8 degrees. The corresponding six prisms at of the screen are ter downward so that the short prism at the bottom is again a 5 degree prism, the next above it is 6 and so on in reverse order to the top series thus again giving a maximum depressor function to the long prism adjacent the middle portion of the body portion anda series of sive angular function 1. A refractive screen for a comprising a For this purpose 5 or even less- The exact degree of tions of the screen reversed in the progres-.
time give a' distribu-- be approximately uniform lamp to the farthest point vertical section through a 'The screen 3 consists of a circular thelower face decreased from the centransverse prismatic elements inothe upper transverse and, lower portions thereof 'having an op sitely progressiveangular gradation relative to each other, and an intermediate zone of risms o1- uniform angularity.
2. A re active screen for a headlight,
comprising a body portion, and a series of transverse prismatic elements of an angularity increasing from the to toward the center and decreasing from t e center to ward the bottom, and in intermediate zone 10 of transverse'prisms of uniform singularity,
,In testimo y whereof we aflix our signa tures in presence of two witnesses.
. p RALPH H. HOLMAN. c FRANCIS'D. SHENK. Witnesses:
US121296A 1915-12-16 1916-09-20 Headlight Expired - Lifetime US1331813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US121296A US1331813A (en) 1915-12-16 1916-09-20 Headlight

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6710515A US1224421A (en) 1915-12-16 1915-12-16 Headlight.
US121296A US1331813A (en) 1915-12-16 1916-09-20 Headlight

Publications (1)

Publication Number Publication Date
US1331813A true US1331813A (en) 1920-02-24

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Family Applications (1)

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US121296A Expired - Lifetime US1331813A (en) 1915-12-16 1916-09-20 Headlight

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