US3576563A - Railroad signal having light piping from source mounted an exterior of reflector cone - Google Patents

Railroad signal having light piping from source mounted an exterior of reflector cone Download PDF

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Publication number
US3576563A
US3576563A US730482A US3576563DA US3576563A US 3576563 A US3576563 A US 3576563A US 730482 A US730482 A US 730482A US 3576563D A US3576563D A US 3576563DA US 3576563 A US3576563 A US 3576563A
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Prior art keywords
light
signal
railroad
railroad signal
trunk
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Expired - Lifetime
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US730482A
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English (en)
Inventor
Harrison A Scott
James E Moe
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RAILROAD ACCESSORIES CORP
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RAILROAD ACCESSORIES CORP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1827—Daylight signals using light sources of different colours and a common optical system

Definitions

  • a railroad signal has separate light sources for each of the separate colors employed, such as red, yellow, and green or other standard colors.
  • the light sources are located away from the external lens of the signal unit, and are housed deep within the metal casing in order to protect them from vandalism.
  • This invention is particularly concerned with signals for railroad use, and generally relates to traffic signals or any application requiring the display of colored indications.
  • Multicolor traffic control signals are employed for the control of both road and rail traffic.
  • a red signal indicates stop
  • a yellow signal indicates caution
  • a green signal allows the traffic to proceed.
  • another color such as blue or lunar white may be required for a particular signaling function.
  • Such traffic control signals suffer from a number of problems, particularly in the railroad field.
  • Railroad trains often include a large number of cars traveling at substantial speeds, and therefore develop such great momentum that they are very difficult to stop quickly when the need arises.
  • Another approach to the problem has been to provide a single light source and a single lens system, and to change the color of the signal by interposing different color filters between the light source and the lens system by mechanical means, electromagnetically operated.
  • the light pipe material suggested in the Peter patent is conventional plastic such as polymerized methyl methacrilate, commonly known by various trademarks such as Lucite, Plexiglass, or, as referred to in the Peter patent, Perspex.
  • this material although well suited for various lightconducting applications where light intensity is not a serious problem, is subject to a very serious defect which makes it totally unacceptable in the present environment.
  • the material suggested in the Peter patent conducts light by means of internal reflection with an efficiency of approximately 50 percent per reflection.
  • This invention aims to provide a railroad signal of very high efficiency and generally improved design. More specifically, an objective of this invention is to provide a railroad signal of such high efficiency that it will produce an adequate and acceptable signal indication. At the same time, it is also an object of this invention to achieve this result without the use of any mechanical moving parts. The object is to change signal colors entirely by means of electrical switching. However, it is an objective to accomplish this without the use of separate optical systems. To state the matter another way, this invention for the first time provides a plurality of different colors, operating through a common optical system, without an objectionable loss of light flux through the system.
  • Another specific object of the invention is to provide a railroad signal having a high efficiency light-piping system, with no interfaces whatsoever interposed in the path of the signal light.
  • Fiber optics are bundles of individual light-conducting fibers, each fiber within the bundle being individually coated with a material which causes the walls of the individual fibers to achieve substantially total internal reflection as the light is guided through the fiber.
  • a material which causes the walls of the individual fibers to achieve substantially total internal reflection as the light is guided through the fiber.
  • the present invention for the first time provides a railroad signal constructed with the light sources located deep within the confines of the metal housing of the signal, where they are protected from vandalism, yet the light produced by these sources is piped with very high efficiency, to a common optical outlet.
  • the result is the very first railroad signal of this type which is intense enough to be practical for actual railroad applications.
  • this construction obviates the necessity for a plurality of individual optical outlets for the signal light, thus effecting economies in the construction, installation, and alignment of the railroad signal.
  • FIG. 1 is a front elevational view of the railroad signal in accordance with this invention, mounted upon a supporting post;
  • FIG. 2 is a sectional view of the same railroad signal taken along the lines 2-2 of FIG. 3;
  • FIG. 3 is a rear view of the signal of the previous F IGS., with the rear casing cover removed to reveal details of the interior construction;
  • H0. 4 is a side elevational view, with parts sectioned, of the fiber optic light pipe of the railroad signal of the previous FIGS.,
  • FIGS. 5, 6, 7 and 8 are sectional views of the fiber optic light pipe of FIG. 4 taken along the lines 55, 66, 7-7, and 8-8 thereof respectively;
  • FIG. 9 is a perspective view, partially schematic, of a test facility in accordance with additional aspects of this invention.
  • FIG. 10 is a side elevational view of the sighting tube of the railroad signal of this invention.
  • FIG. I l is a side elevational view, with parts removed, of the light source and part of the optics of the railroad signal of this invention.
  • FIG. 12 is a sectional view, taken along the lines I242 of the light source of FIG. I I.
  • FIG. 1 shows the entire railroad signal 20 which is mounted beside a railroad track upon a supporting post 22 by means of U-bolts 24 cooperating with a triangular bracket 26.
  • a cable 28 carrying power and signal lines comes up through the interior of the supporting post 22 and emerges therefrom, entering the railroad signal 20 through a supporting hub 30 which is integral with the triangular bracket 26.
  • the signal 20 is rotatable upon the hub 30 in order to permit alignment with the track direction.
  • the signal is enclosed within a protective metal housing 32.
  • a protective metal housing 32 In the front view of FIG. I it is seen that the front wall of the housing 32 has a light-emitting port which is covered by a substantially circular collimating lens 34 of the Fresnel variety, which may be molded of glass or of an impactresistant plastic material such as Tenite" butyrate.
  • the lens 34 may be designed to provide any desired divergence or spread of the collimated beam in any desired direction by such means as the ribbed center portion thereof shown in FIGS. 1 and 2, or other superimposed ribbing or deflectors.
  • a plurality of bolts 36 secure the retaining ring 50 of the collimating lens 34 to the front wall of the housing 32.
  • the lens 34 provides a bright, highly visible and enticing target for vandals, it is vulnerable to rocks, pellets and rifle bullets.
  • prior art railroad signals there were one or more such lenses on each railroad signal with the light bulbs or mechanism mounted immediately behind the lens in optical relationship therewith. Accordingly, a rifle bullet fired at the apparent source of light, i.e. the lens, would destroy the light bulb or mechanism as well, and could thereby put the railroad signal entirely out of commission or cause it to display a false signal indication.
  • One additional feature, which is visible in the front view of FIG. 1, is the front end of an alignment sight 38 which is used for orienting the railroad signal 20 precisely parallel to the railroad track so that its light can be seen from great distances as the train approaches.
  • a pair of ears 40 which support the hinges 42 of a rear cover 44 cooperating with the housing 32 to provide a protective shell for the railroad signal 20.
  • the rear cover 44 may be opened by means of the hinges 42 to expose the internal components of the railroad signal 20 for servicing when necessary.
  • a bolt 46 serves to keep the rear cover 44 closed.
  • the bolts 36 pass through a flange of a metal cone 52.
  • This cone serves a variety of purposes. It is the basic support for a plurality of light bulbs 54, 55, and 57 and color filters 68, one for each color generated by the railroad signal 20. Any required number of colors may be similarly provided by the signal units of the invention, limited only by space requirements. In the following discussion, three units will be described, for simplicity of description.
  • the cone 52 also serves to support the transmitting end of a fiber optic bundle 56 which is inserted into a cylindrical opening at the narrow end of the cone and clamped in place by a setscrew 58.
  • the cone 52 also serves to absorb and avoid reflection of extraneous light, and to exclude extraneous light from the aperture of lens 34, and to exclude extraneous light from the aperture of lens 34, and to provide a contrasting background for the observation of the illuminated output end of liher hundle 56 if lens 34 should be destroyed by vandalism.
  • FIGS. 2 and 3 show the manner in which the light bulbs 54, $5 and 57 are mounted upon the cone 52. I-laeh of the light bulbs is supported within an electrical socket 64 which in turn is mounted upon a metal bracket 66 attached to-the outer surface of the metal cone 52 for firm support and good heat conduction.
  • the light from each bulb, e.g. the bulb 54 passes .through a colored filter such as filter 68 which determines the color of the signal light. ln a typical signal, light bulb 54 would have a red filter, light bulb 55 would have a yellow filter, and light bulb 57 would have a green filter.
  • each of the brackets 66 has a hollow cylindrical extension 70 into which is inserted the input end of a branch of the fiber optic bundle 56. Additionally, this bracket extension 70 serves as a heat sink conducting heat produced by lamp 54 away from an input and ferrule 74 of liber bundle 56.
  • the fiber optic bundle is divided into branches 72, 80 and 82, each of which includes approximately one-third of the total number of fibers in the bundle 56.
  • the other branch fiber optic bundles 80 and 82 are inserted and clamped in the cylindrical extensions 70 of the supporting brackets 66 of the other signal'lamps 55 and 57.
  • a shrink-fit plastic sleeve 84 surrounds the fiber optic bundle 56 at the point where it separates into the three branch bundles 72, 80 and 82.
  • a terminal block 90 is mounted in the lower interior of the housing 32 to provide convenient electrical connections at the termination of the cable 28.
  • a bank of resistors 92 in the lower section of the housing 32 which are adjustable by means of slides 94 to control the voltage applied to the signal lamps 54, 55 and 57.
  • FIGS. 4 through 8 are enlarged views of the fiber optic bundle 56, and its branches 72, 80, and 82.
  • Light from one of the three bulbs, e.g. light bulb 54 enters one of the branch fiber optic bundles, e.g. the branch 72, at the end where it is bound by the metal ferrule 74, and continues on down the light pipe formed by each branch bundle until all three branches are joined into one trunk fiber optic bundle 56 comprising a 'uniform intermixture and distribution of all the fibers from the three branches across the entire cross section of trunk bundle 56, in order to spread the light from'each bulb 54 uniformly across the entire output end area of bundle 56.
  • the light then continues through the trunk bundle 56 until it emerges from the end of the bundle which is clamped in the cylindrical opening of the cone 52.
  • the termination of the fiber optic bundle 56 constitutes the source of a light beam 100 which emerges from the fiber optic bundle 56 with a spread of about 60 as shown in FIG. 2.
  • This light beam 100 is then collimated by the plastic'lens 34 to provide a collimated beam each branch bundle 72, 80 and 82 across the cross section of trunk bundle 56.
  • the entire fiber optic assembly is a unit specially fabricated in the form illustrated, including the metal ferrule 74 at the end of each branch bundle 72, 80 and 82. Behind the metal ferrules the branch bundles are protected by flexible plastic sleeves 103 and further on by the shrink-fit sleeve 84 where the three branch bundles come together. Beyondthat point, a metal protective sleeve 104 is provided to prevent damage to the fiber optic bundle 56.
  • the flexible sleeves 103 provide protection for the branch bundles 72, 80 and 82, yet permit them to be flexed so as to assume the curved configuration required (see H6. 3) for connection to the three different cylindrical extensions 70 during construction of the signal 20. 1
  • each of the branch bundles 72, 80 and 82 become intermixed in a uniform fashion'between sections 6-6 and shown in FIG. 4.
  • This uniform intermixture means that the light beam which emerges from the end of the bundle 56 is substantially the same, except for color, regardless of which one of the three branch bundles is the source of the light at any given time.
  • the properties of the fiber optic bundle 56 are such that it has an extremely high light transmissivity, because it does not lose any light laterally at the interface of the core and coating of the fibers during refraction. This is because of the individual coating on the outside surface of each fiber, which causes nearly total internal refraction at the interface, so that the fibers act as highly efficient light guides.
  • the structure of the Peter patent results in delivery of the light from each of the branch light pipes to only one lateral portion of the trunk pipe, with the result that the beam which emerges from the delivery end of the combined pipe is not homogeneously distributed over the end face of the trunk pipe. ln contrast, the structure of the present invention guarantees far greater homogeneity, since the individual fibers which make up any one branch light pipe 72, 80 or 82 are distributed uniformly over the trunk bundle 56.
  • FIGS. 11 and 12 are closeup views of the light bulb, e.g. bulb 54, showing the filament 110, and ellipsoidal reflector surface 112 at the rear, and an annularly shaped segment of a spherical reflector surface 114 at the front of the bulb surrounding a transparent window 116.
  • the filament is substantially at one focus of the ellipsoidal surface 112, while the entrance end of the branch fiber optic light pipe 72 is at the other focus. Therefore, the light originating from the filament 110 and initially striking the rear reflector 112, passes through the window 116 and is focused at a point inside the entrance end ofthe branch light pipe 72.
  • the filament 110 is also substantially at the center of the spherical front reflector surface 114, so that light originating from the filament and initially striking the front reflector is reflected back to the point of origin in the other direction, eventually reaching the reflector 112 and then being focused in the manner described above.
  • Light originating from the filament 110 and proceeding directly forwardly passes directly through the window 116.
  • Light rays having all these various paths of course pass through the colored filter 68 on their way to the light pipe branch 72.
  • color filter 68 is preferably tilted slightly to avoid direct and return reflections from filter 68 to ellipsoidal reflector 112.
  • ellipsoidal reflector 112 with filament 110 at its first focus and the input end of branch fiber bundle 72 at its second focus may be incorporated in other forms of lamp envelopes or lamp assemblies, or that a conventional condenser lens system may be used with reduced efficiency.
  • E16. 10 shows the alignment sight 38 for the railroad signal 20, together with the bracket for mounting and adjusting the sight within the casing 32. A technician can look through the alignment sight 38 and far down the track so as to determine the point toward which thesignal beam is directed.
  • FIG. 9 illustrates apparatus according to this invention for determining that the sight 38 is aligned properly with respect to the axis of the beam of signal 20.
  • a target board which has four photocells 132 at the comers thereof and a target 134 at the center.
  • the light beam of the signal is directed at the target board 130, and the signal is turned until the beam hits the center of the target 134.
  • Fine adjustments are made until the electrical response from all four photocells 132 is equal.
  • This condition can be determined by a sensitive electrical instrument such as a Wheatstone bridge having the four photocells 132 in the respective bridge arms. Such equality indicates that the beam of signal 20 is pointed directly toward the center of the target.
  • the signal 20 is then fixed in that position, and the alignment sight 38 is loosened and aligned with a secondary target 136 provided at the right-hand side of the target board 130. It is then assured that the sight is properly positioned with respect to the signal beam.
  • the alignment sight 38 can then be used to align the signal 20 with the railroad track during installation by sighting down the tube 38.
  • the present invention provides apparatus for precisely aligning the sight within the railroad signal unit. Then the sight can be used for aligning the signal beam with the track so that its high light output can be used for maximum effect and will be visible at great distances down the track.
  • a high-efficiency railroad signal comprising a plurality of sources of light beams of different colors, means providing a common axis egress from said railroad signal for said different-colored beams, and a light pipe including branches having entrance ends positioned for capturing respective different-colored light beams and combining into a common trunk having an exit end positioned to direct all of said different-colored light beams to said common egress, said light pipe being a fiber optic bundle comprising a plurality of discrete light-conducting fibers of a first material individually coated with a second material of a differing refractive index to produce total internal refraction at the interface between the materials, a different group of fibers originating from said common trunk and diverging therefrom to form each of said branches.
  • a railroad signal comprising a housing formed with an opening to allow a light beam to exit therefrom, a supporting cone having an opening at its apex and an opening at its base, said cone being mounted with said base in surrounding relationship to the opening in said housing, a lens mounted over said opening and cooperating with said cone substantially to enclose the interior thereof, at least one light source supported on the exterior of said supporting cone, and a light pipe arranged to convey light from said source to said apex opening.
  • a railroad signal as in claim 4 including means for focusing the light from said source upon the adjacent light pipe end.
  • said lightfocusing means include an ellipsoidally shaped reflector and a light source positioned substantially at a first focus of the ellipsoidal reflector, with the input end of said light pipe being positioned at a second focus of the ellipsoidal reflector.
  • a railroad signal comprising:
  • branch bundles being continuous and converging into a common trunk bundle
  • H means for collimating the light delivered by said trunk bundle end
  • trunk bundle end being cylindrically encased in a relatively rigid material
  • J. means engaging said rigid casing to secure said trunk bundle end in position relative to said collimating means.
  • said branch bundles curve from said light sources to the place where they combine into said trunk bundle
  • a flexible protective coating covers said fiber optics between said rigid casings to permit flexing of said branch bundles for ease of installation in said railroad signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Light Guides In General And Applications Therefor (AREA)
US730482A 1968-05-20 1968-05-20 Railroad signal having light piping from source mounted an exterior of reflector cone Expired - Lifetime US3576563A (en)

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US73048268A 1968-05-20 1968-05-20

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US (1) US3576563A (de)
DE (1) DE1766835A1 (de)
ES (1) ES358339A1 (de)
FR (1) FR1588940A (de)
GB (1) GB1226855A (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829857A (en) * 1970-06-01 1974-08-13 Rank Organisation Ltd Optical signalling
JPS5057197A (de) * 1973-09-06 1975-05-19
US3899786A (en) * 1972-06-02 1975-08-12 Siemens Ag Liquid crystal color display system
EP0124795A2 (de) 1983-04-11 1984-11-14 Fuji Photo Film Co., Ltd. Photographische Silberhalogenidemulsionen
US4659176A (en) * 1982-12-31 1987-04-21 Kei Mori Structure and implement for positioning the light-receiving edge of the light conductor onto the focus of the lens
US5433166A (en) * 1992-10-13 1995-07-18 General Railway Signal Corporation Railway light signal
US5639047A (en) * 1995-07-24 1997-06-17 Union Switch & Signal, Inc. Railroad signal with remote light source
US5697584A (en) * 1995-07-27 1997-12-16 Union Switch & Signal Inc. Railroad searchlight signal with solid state illuminant and aspect indication
WO2001030634A1 (en) * 1999-10-28 2001-05-03 Dialight Corporation Led wayside signal for a railway
US6441750B1 (en) * 2000-08-22 2002-08-27 Power Signal Technologies Inc. Light alignment system for electronically steerable light output in traffic signals
US20020191920A1 (en) * 2001-06-14 2002-12-19 Schladenhauffen Mark S. Multiple viewing angle cover having integral light pipe
US20030076237A1 (en) * 2000-05-10 2003-04-24 Simon Blumel Signaling device for traffic signals
US20040134138A1 (en) * 1999-10-01 2004-07-15 Larue John L. Camouflaged structure and method of camouflaging a structure against a background having a generally uniform composition
US20050135106A1 (en) * 2003-12-22 2005-06-23 Schott Glas Fresnel lens spotlight with coupled variation of the spacing of lighting elements
US20050135096A1 (en) * 2003-12-22 2005-06-23 Schott Glas Fresnel spotlight
US20050162750A1 (en) * 2003-12-22 2005-07-28 Schott Ag Fresnel lens spotlight
US20050168995A1 (en) * 2003-12-22 2005-08-04 Schott Ag Fresnel lens spotlight with coupled variation of the spacing of lighting elements
US20060028834A1 (en) * 2004-08-09 2006-02-09 Miller Jack V Hybrid fiber optic framing projector
US20070074592A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure allowing for adjustment of sensor position
US20070074583A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with snapping feature
US20070074591A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with light pipe
US20070074582A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with adjustable swivel ball and panel mounting mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2394592B (en) * 2002-10-21 2005-12-14 * Dorman Traffic Products Limited Signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2305185A (en) * 1937-08-12 1942-12-15 Gen Railway Signal Co Control switch for railway traffic controlling systems
US2589569A (en) * 1948-08-04 1952-03-18 Westinghouse Brake & Signal Optical system for use in light signals, indicators, and the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2305185A (en) * 1937-08-12 1942-12-15 Gen Railway Signal Co Control switch for railway traffic controlling systems
US2589569A (en) * 1948-08-04 1952-03-18 Westinghouse Brake & Signal Optical system for use in light signals, indicators, and the like

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829857A (en) * 1970-06-01 1974-08-13 Rank Organisation Ltd Optical signalling
US3899786A (en) * 1972-06-02 1975-08-12 Siemens Ag Liquid crystal color display system
JPS5057197A (de) * 1973-09-06 1975-05-19
JPS56839B2 (de) * 1973-09-06 1981-01-09
US4659176A (en) * 1982-12-31 1987-04-21 Kei Mori Structure and implement for positioning the light-receiving edge of the light conductor onto the focus of the lens
EP0124795A2 (de) 1983-04-11 1984-11-14 Fuji Photo Film Co., Ltd. Photographische Silberhalogenidemulsionen
US5433166A (en) * 1992-10-13 1995-07-18 General Railway Signal Corporation Railway light signal
US5639047A (en) * 1995-07-24 1997-06-17 Union Switch & Signal, Inc. Railroad signal with remote light source
US5697584A (en) * 1995-07-27 1997-12-16 Union Switch & Signal Inc. Railroad searchlight signal with solid state illuminant and aspect indication
US7836661B2 (en) 1999-10-01 2010-11-23 Larue John J Method of camouflaging a structure against a background having a generally uniform composition
US20040134138A1 (en) * 1999-10-01 2004-07-15 Larue John L. Camouflaged structure and method of camouflaging a structure against a background having a generally uniform composition
US20070144109A1 (en) * 1999-10-01 2007-06-28 Larue John L Method of Camouflaging a Structure Against a Background Having a Generally Uniform Composition
US7216463B2 (en) * 1999-10-01 2007-05-15 Larue John L Camouflaged structure and method of camouflaging a structure against a background having a generally uniform composition
US6435459B1 (en) * 1999-10-28 2002-08-20 Dialight Corporation LED wayside signal for a railway
WO2001030634A1 (en) * 1999-10-28 2001-05-03 Dialight Corporation Led wayside signal for a railway
US20030076237A1 (en) * 2000-05-10 2003-04-24 Simon Blumel Signaling device for traffic signals
US6970296B2 (en) * 2000-05-10 2005-11-29 Osram Gmbh Signaling device for traffic signals
US6441750B1 (en) * 2000-08-22 2002-08-27 Power Signal Technologies Inc. Light alignment system for electronically steerable light output in traffic signals
US20020191920A1 (en) * 2001-06-14 2002-12-19 Schladenhauffen Mark S. Multiple viewing angle cover having integral light pipe
US6937812B2 (en) * 2001-06-14 2005-08-30 Rockwell Automation Technologies, Inc. Multiple viewing angle cover having integral light pipe
US20050135096A1 (en) * 2003-12-22 2005-06-23 Schott Glas Fresnel spotlight
US20050168995A1 (en) * 2003-12-22 2005-08-04 Schott Ag Fresnel lens spotlight with coupled variation of the spacing of lighting elements
US20050135106A1 (en) * 2003-12-22 2005-06-23 Schott Glas Fresnel lens spotlight with coupled variation of the spacing of lighting elements
US20050162750A1 (en) * 2003-12-22 2005-07-28 Schott Ag Fresnel lens spotlight
US20060028834A1 (en) * 2004-08-09 2006-02-09 Miller Jack V Hybrid fiber optic framing projector
US7223002B2 (en) * 2004-08-09 2007-05-29 Miller Jack V Hybrid fiber optic framing projector
US20070074591A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with light pipe
US20070074582A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with adjustable swivel ball and panel mounting mechanism
US20070074583A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure with snapping feature
US7412900B2 (en) 2005-09-30 2008-08-19 Rockwell Automation Technologies, Inc. Sensor mounting structure with adjustable swivel ball and panel mounting mechanism
US7415891B2 (en) 2005-09-30 2008-08-26 Rockwell Automation Technologies, Inc. Sensor mounting structure with snapping feature
US7527437B2 (en) 2005-09-30 2009-05-05 Rockwell Automation Technologies, Inc. Sensor mounting structure with light pipe
US7546780B2 (en) 2005-09-30 2009-06-16 Rockwell Automation Technologies, Inc. Sensor mounting structure allowing for adjustment of sensor position
US20070074592A1 (en) * 2005-09-30 2007-04-05 Santos Roberto S Sensor mounting structure allowing for adjustment of sensor position

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Publication number Publication date
ES358339A1 (es) 1970-08-16
GB1226855A (de) 1971-03-31
FR1588940A (de) 1970-03-16
DE1766835A1 (de) 1972-02-17

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