US3715198A - Apparatus for producing all-glass multiple sheet glazing units - Google Patents

Apparatus for producing all-glass multiple sheet glazing units Download PDF

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Publication number
US3715198A
US3715198A US00052471A US3715198DA US3715198A US 3715198 A US3715198 A US 3715198A US 00052471 A US00052471 A US 00052471A US 3715198D A US3715198D A US 3715198DA US 3715198 A US3715198 A US 3715198A
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United States
Prior art keywords
fluid medium
path
sheets
sealing
conduit
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Expired - Lifetime
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US00052471A
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English (en)
Inventor
L Wheat
O Tary
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Pilkington North America Inc
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Libbey Owens Ford Co
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Assigned to LOF GLASS, INC. reassignment LOF GLASS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LIBBEY-OWENS-FORD COMPANY AN OH. CORP.
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/24—Making hollow glass sheets or bricks
    • C03B23/245—Hollow glass sheets

Definitions

  • the primary object of this invention is to provide, in a method and apparatus of that type improved sensing and control means for more accurately and expeditiously locating and positioning the elements used in sealing the edges of the spaced sheets of glass.
  • FIG. 1 is a-perspective view of an all-glass multiple sheet glazing unit of the type with which this invention is concerned;
  • FIG. 2 is a sectional view of the glazing unit taken substantially along the line 2-2 in FIG. 1;
  • FIG. 3 is a fragmentary, longitudinal, vertical, sectional view of apparatus for producing all-glass multiple sheet glazing units according to this invention
  • FIG. 4 is a transverse vertical sectional view taken substantially along line 4-4 in FIG. 3;
  • FIG. 5 is a horizontal, plan view taken substantially along line 5-5 in FIG. 4;
  • FIG. 6 is a longitudinal, vertical, sectional view of a detecting unit constructed in accordance with this invention taken substantially along line 6-6 of FIG. 5;
  • FIG. 7 is a horizontal, sectional view taken substantially along the line 7-7 of FIG. 6;
  • FIG. 8 is a transverse, vertical, sectional view taken on the line 8-8 of FIG. 6;
  • FIG. 9 is a transverse, vertical, sectional view taken on the line 9-9 of FIG. 6;
  • FIG. 10 is a perspective view of an air-receiving plate
  • FIG. 11 is a schematic view of the manner of forming an edge wall.
  • FIG. 12 is a diagrammatic view of the control system in which the detecting or sensing unit is incorporated.
  • FIGS. 1 and 2 of the drawings an all-glass multiple sheet glazing unit of the character contemplated by the invention.
  • a hermetically sealed air space 26 from which any moisture-contain ing air may be removed through a tubular insert 27 (shown in dotted lines) which can then be sealed shut.
  • the means for producing such all-glass multiple sheet glazing units normally includes a furnace 30 and associated means 31 adapted to support and carry a pair of glass sheets upright and in spaced face to face relationship through the furnace.
  • a sealing assembly designated by the numeral 38 which include (FIG. 5) a support element or platform 40 on which may be mounted a sensing or detecting device 41, a fusion burner unit 42, an insert feeding unit 43, a pair of forming rolls 44 and a burner unit 45 for fire-polishing the outer surface of the newly formed edge wall.
  • the platform 40 is connected to the outer end of a rod 47 (FIGS.
  • the supporting and conveying means designated 31 may be of any known construction capable of supporting and conveying the glass sheets in proper relationship through the furnace and ofturning them at specified intervals to bring successive edges intooperative position, a substantially identical structure to that used for this purpose in U.S. Pat. No. 3,257,187, above referred to, has been illustrated more or less diagrammatically here and will be described only briefly.
  • the exterior or conveyor portion of the means 31, which has been shown in broken lines in FIG. 4, includes a roll supporting framework 55 and a carrier 56 equipped with runner bars 57.
  • the rolls 58 for supporting the runner bars are mounted in pairs on shafts 59 journaled in bearings 60 on the framework 55.
  • the roll shafts are driven by a common shaft 61 and meshing worm and wheel gears 62 and 63.
  • the carrier further includes meansfor structurally supporting a pair of vacuum platens 65 and 66, the opposed surfaces of which are provided with grooves 67 and 68 connected to a source of evacuation (not shown) to hold glass sheets against the said opposed surfaces.
  • the platen 65 is mounted at the end of a shaft 70 which is supported on the carrier in a manner to permit the platen 65 to be moved toward and away from the platen 66 as well as to turn the platen.
  • Vacuum platen 66 on the other hand is carried on a beam 72 supported from the carrier by spaced annular bars 73 and 74 (FIGS. 3 and 4), and platen 66 is adapted to be turned with reference to the platen 65 so that the pair of glass sheets can be rotated to sequentially present their edge portions for the sealing operation.
  • the shaft 70 and bars 73-74 from the carrier extend into the furnace by way of an elongated slot, indicated at 75, in the wall 33, to move the glass sheets into and through each of the one or more sealing stations.
  • a pair of glass sheets 20 are preferably preheated to temperatures above their point of strain, then located between the platens 65 and 66 and supported thereby in spaced face to face relation for movement through the sealing furnace 30.
  • each leg 81 and 82 is provided with a bore 87 and 88, respectively, connected to pipes 89 and 90 by suitable pipe fittings 91 and 92 to provide conduits opposing each other across the pass 80.
  • the pipe 89 is used as the supply pipe from a source of air under pressure which is directed through a coiled section 93 (FIG. 5) before reaching the section of pipe designated by the numeral 89.
  • the incoming air is thereby heated to sustain the relatively high tempera ture at the marginal edge portions of the sheets presently heated above the point of strain. This also acts to reduce turbulence and rapid expansion of the air at the detecting device 41.
  • the pipe 90 serves as the receiver pipe and connects to an element of the control system, as will shortly be described.
  • a plate 95 On the inner surface of leg 81, a plate 95, having aperture 96 axially aligned with the bore 87, is mounted by screws 97; said plate carrying a centrally disposed disc 98 secured therein by screws 99.
  • screws 101 support a plate 102 having an aperture 103, axially aligned with the bore 88, and a centrally disposed disc 104 secured by screws 105.
  • disc 98 is provided with a vertical slot defining a supply orifice 107, while the disc 104, as in FIGS. 7 and 9, has a vertical slot defining a receiver orifice 108; supply slot 107 being of narrower width or horizontal dimension thanthe opposed slot 108.
  • the disc 104 is provided on one surface with a pair of cars 109 having opposed, outwardly divergent surfaces 110.
  • the cars 109 are located in the bore 88 of the leg 82 and by their surfaces 110 reduce turbulence in the air stream passing through the receiver slot 108.
  • a stream of air A flowing across the pass 80 will thus also cross'and be located in the path traversed by the lower edge portions of the glass sheets so that these edge portions, as they move therepast will intercept at least a portion of the air in said stream and so affect the amount of pressure received at the orifice 108.
  • This pressure differential then becomes instrumental in causing the sealing assembly to be moved vertically i.e., upwardly or downwardly until particularly the fusion burner unit 42 and the pair of forming rolls 44 are located at a predetermined elevation with reference to the margins of the lowermost edges of the glass sheets.
  • the system also embodies electric circuitry which directs the pressure of a hydraulic fluid to the cylinder actuator 49.
  • the receiver pipe 90 connects to a chamber 112 closed at one side by a diaphragm 113 so that the static pressure of air in the chamber 112 will effect deflection of said diaphragm.
  • the diaphragm 113 thus provides the actuator component of a pressure, or differential pressure transducer-transmitter 114 which includes a rod 115 fixed to the medial area of the diaphragm 113 and forming an integral portion of an armature 116 in the center of a coil 117.
  • the coil 117 of the transducertransmitter 114 has a primary side connected to an oscillator 118 through lines 119 and 120; said oscillator being powered from a source 121 of AC. (alternating current) electrical energy by lines 122 and 123.
  • the secondary side of the transducer-transmitter 114 through lines 125 and 126 is connected to a demodulator 127 with the output signal being proportional to displacement of the armature 116 during deflection of the diaphragm 113.
  • the demodulator 127 by line 128 feeds a signal of DC (direct current) voltage to an amplifier 130 through an input junction or electrical network 131'and line 132.
  • Junction 131 is connected by line 133 to the manually. adjusted set-point 135 of a potentiometer 136.
  • the resistance 137 of the potentiometer is connected by lines 138 and 139 to a source of DC (direct current) electrical energy 140.
  • set-point 135 is adjusted to a position with reference to the resistance 137 such that the voltage carried by line 133 will be of opposite polarity to that of line 128.
  • the amplifier 130 is connected by lines 141 and 142 to a torque motor 143 associated with the servo-valve 144.
  • This valve is connected by pipe 145 to a source of hydraulic pressure and pipe 146 to a return or sump.
  • pipe 147 one side of the valve 144 is connected to a spring-biased blocking valve 148, having solenoid 149, and thence by pipe 150 to the head end of the cylinder 49.
  • the other side of valve 144 is connected by pipe 151 through the spring-biased blocking" valve 152, having solenoid 153, to a pipe 154 and the rod end of cylinder 49.
  • the desired elevation of the sealing assembly with reference to the lowermost edges of the sheets is obtained by use of the manually adjustable potentiometer 136.
  • a potential of adjustably controlled voltage will be imelectrical network 131.
  • the voltage of line 133 has an opposite polarity to that of the DC signal carried by line 128.
  • the elevation of the sealing assembly can be determined by the voltage fed to the amplifier 130 when the sum of the voltages in line 128 and 133 equal zero.
  • the sealing assembly 38 is preferably located at a lowered or rest elevation that may, by way of example, be in the order of about onefourth inch below the required elevation for sealing of the edge portions of sheets.
  • a full volume of pressure will exist in the height of air stream between the orifices 107 and 108 of the discs 98 and 104 respectively, resulting in a full volume of air pressure in the pipe 90 that will deflect the diaphragm 113 in the chamber 112-to displace the armature 116 by rod 115.
  • valves 148 and 152 are adapted to be opened, in a manner to shortly be more fully explained, and the effective pressure of the air stream entering the receiver slot 108 will be dependent upon the upward movement or elevation of the sealing assembly with reference to the lower edges of the sheets.
  • the pressure of air will be varied by upward movement of the sealing assembly and the-desiredvolume of pressure will be obtained when the volume of air pressure at the chamber 112 is reduced, by way of example, to substantially one-half, which is determined by the setting to which the potentiometer' 136 has been adjusted. Reduction of the pressure within the chamber 112 will cause less deflection of the diaphragm 113 to produce a change in the demodulator 127 whereby voltage of the DC current in line 128' will be decreased until it balances the predetermined voltage of opposite polarity from the set-point 135.
  • the demodulator will feed DC current of (plus) 1 volt through line 128 to the junction 131.
  • the adjusted setting of potentiometer 136 will permit feeding of DC current of- (minus) one-half volt by line 133 to said junction with the resultant sum of voltage being supplied by line 132 to the amplifier.
  • the control system is conditioned to cause upward movement of the sealing assembly 38 if valves 148 and 152 are unblocked.
  • the solenoid 149 of blocking valve 148 and solenoid 153 of valve 152 are energized when the leading ends of the sheet have advanced a distance as of about 1 inch through the detecting device 41 as at the single dot line indicated by the letter L in FIG. 3. Then, when the trailing ends of the sheets are within a distance of about 3 inches from the detecting device, as at the doubleldot line indicated by the letter T in FIG. 3, the said'solenoids will be de-energized to definitely block pipes 147-150 and 151-154 at the respective valves 148 and 152.
  • switch devices are located in spaced relation to one another and are actuated in sequence during movement of the carrier 56 on the conveyor system 31.
  • a switch device LS 156 will be tripped by an actuator bar 157 on the carrier when the edges of leading ends of the sheets, supported by platens 65 and 66, reach the position of line L in FIG. 3.
  • Switch device LS 158 will then be similarly tripped by the bar 157 when the trailing ends of the sheets arrive at the position of line T.
  • the actuator bar 157 is caused to move downward into a position such that it will trip LS 156 and LS 158 after vacuum is applied to support the sheets on the platens 65 and 66.
  • the actuator bar 157 in one way or another, will remain in an inoperable position. Consequently, as the platens are moved through the sealing area, neither LS 156 nor LS 158 will be tripped.
  • a source line 160 is connected to one side of LS 156 which at its other side is in circuit by line 161 through the solenoid 162 of a relay switch RS 163, having opposed solenoid 164 and normally disengaged pairs of contacts 165 and 166, to the opposite source line 168.
  • Contact pair 165 is adapted to complete a circuit from source line 160 via line 169 through the solenoid 149 of valve 148 to opposite source line 168.
  • Contact pair 166 also complete a circuit from the source 160 by line 172 through the solenoid 153 of valve 152 to source line 168.
  • valves 148 and 152 now being open, pipes 147-150 will direct hydraulic pressure to the head end of cylinder actuator 49 and beneath the piston 48, causing rod 47 to move the sealing assembly upwardly to seek or detect the lower edges of the sheets. At the same time, pressure at the rod end of the cylinder will be drained through pipes 151 and 154 to the return or sump.
  • LS 156 can also be instrumental in opening the supply pipes from a source of combustible gas to the fusion burner unit 42 and firepolishing unit 45 whereby the flames in one unit will raise the lower edge portions of the sheets to a semiplastic condition and the flames of the second unit will wall after it has been formed'by the rolls 44.
  • LS 158 is tripped by the actuator bar 157, on the carrier 56, substantially at the instant the trailing ends of the sheets reach the position T.
  • LS 158 is adapted to de-energize solenoids 149 and 153 and simultaneously activate a timing relay that is adapted to later cause return of the sealing assembly to the lowered elevation and also terminate connection of the burner units to the source of combustible gas.
  • LS 158 is connected to source line 160 and completes a circuit be line 173 through the opposed solenoid 164 of RS 163 to source line 168 to disengage pairs of contacts 165 and 166.
  • This will deenergize solenoids 149 and 153 of related valves 148 and 152 to again block communication between pipes 147-150 and 151-154 respectively.
  • Line 173 is also completed to timing relay TR 175, in series with source lines 160 and 168; said timing device being of the adjustable interval variety and presently set for the duration of time required for the trailing ends of the glass sheets to be carried from the detecting unit 41-, see line T in FIG. 3, to a point beyond the firepolishing burner unit 45, line T1 of FIG. 3.
  • This setting can be determined by the horizontal dimensions of the sheets. These of course (both the horizontal and vertical) will vary due to the variations of dimensional size of the sheets and completed glazing units formed therefrom.
  • a circuit will be extended by line 176 through the end 177 of a reversible four-way valve 178 to source line 168.
  • This valve suitably connected to supply pipe 145 and return pipe 146, has one side joined to pipe 150 by pipe 180 and its opposite side to pipe 154 by pipe 181. While the end 177 is energized, hydraulic pressure will be directed from pipe 145 through pipes 181 and 154 to the rod end of the cylinder 49 thereby driving piston 48 downward and lowering the sealing assembly. At the same time, pressure is exhausted from beneath the piston 48 by pipes 150-180 to pipe 146. With the flames of burner units 42 and 45 being extinguished, the sealing assembly will be conditioned for subsequent operation.
  • the set-point of the potentiometer should be adjusted to create a DC current of (minus) 0.6 volt in line 133.
  • the distance of the lowermost edges of the sheets from the surface 83 will be increased the determined amount and the voltage sum to line 132 will be reduced to zero when the original (plus) 1 volt in line 128 is reduced to (plus) 0.6. volt.
  • a two-way manual switch device MS 183 is equipped with a movable contact 184 connected to source line 160; fixed contact 185 connected by line 186 to the end 187 of the valve 178 and contact 188 connected by line 189 to the opposite end 177.
  • a circuit from contacts 184 and 185 by line 186 through the valve end 187 to source line 168 will cause the direction of pressure from supply pipe through pipes 180-150 to the head end of the cylinder 49 to raise the sealing assembly a desired distance; a return of fluid being obviously through pipes -181 and 146.
  • engagement of contact 184 with contact 188 will complete of the detecting device 41 and ultimately downward I under control of the timing relay TR 175.
  • An additional'novel feature of this invention is the provision of means for maintaining the open size ofthe receiver orifice 108 at its maximum area and the related edges unobstructed from dust or even particles of glass.
  • a vertical passageway 195 is made in the block 84 to open into the bore 87 of the integral leg 81 and a passageway 196 is similarly provided to open into the bore 88 of the leg 82. Both of the passageways are closedadjacent-the base 85 of the block by plugs 197.
  • the block is horizontally drilled to provide a cross-passageway 198 that is tapped at its opposite ends and closed by suitable pipe plugs 199.
  • the passageway 198 is internally threaded to receive a threaded plug 100 having a restricting bore 201 of relatively small dimension, as in FIG. 8.
  • the air pressure within the bore 87 of leg 81 and directed toward the orifice 107 in the disc 98 will thusly be also directed downwardly by passageway 195 through the restricting bore 201 of the plug 200 and by passageway 198 through passageway 196 upwardly into the bore 88 in leg 82.
  • This will result in reversely directed air pressure at the receiving orifice 108 to loosen, disperse or otherwise discharge any objectionable particles adhering to the edges of the slot or orifice 108.
  • the orifice 108, and bore 88 in the leg portion 82 of the body portion or block 84, are connected by pipe 90 to the chamber 112 in the casing of the pressure transducer 114.
  • the diaphragm 113 closing the chamber and being deflected outwardly by the contained air pressure, moves the armature 116 by rod 115 to displace the same with reference to coil 117. Froma normally idle position, displacement of the armature 116 causes a maximum output signal from the secondary side of the coil 117 to produce a response in the amplifier 130 such that it will activate the torque motor 143, and through the servovalve 144, act to direct hydraulic pressure from supply pipe 145 to pipe 147"and returnpipe 146 to pipe 151. Connection of these pipes to associated pipes 150 and 154 and the respective ends of the cylinder 49 is however at this time interrupted by the blocking valves 148 and 152.
  • the bar control system maintains the sealing assembly substan-
  • the detecting device 41 When especially the detecting device 41 has been moved upwardly with reference to the lowermost edges of the sheets, they will obstruct the stream of air in the pass between the orifices 107 and 108. As the pressure of the air is gradually reduced to substantially one-half by upward movement of the sealing assembly, the amount of pressure received within the chamber 112 will be proportionately reduced and cause displacement of the armature 116 relative to the coil 117 from the idle or rest position.
  • the potentiometer 136 can be adjusted to vary the voltage in line 133 and in actual operation, places a voltage of desired potential at the input junction, or electrical network, 131 to the amplifier said voltage having an opposite polarity to the polarity of the signal from the demodulator 127.
  • the signal from the transducer 114 will cause the demodulator 127 to supply DC current through the line 128 at a potential of, as for example, +0.4 volt.
  • the voltage in line 132 to the amplifier will be unbalanced or lowered such that said amplifier will activate the torque motor 143 and servo-valve 144 to lower the sealing assembly until the stream of air equals substantially half the full pressure and the sum of the voltages in lines 128 and 133 will equal zero. This is obtained by connecting supply pipe to pipes 151-154 and the rod end of the cylinder 49.
  • TR 175 completes a circuit through the valve 178 to connect supply pipe 145 through pipe 181 and 154 to the rod end of cylinder 49. This will operate to lower the sealing assembly to the elevation of its rest position.
  • a detecting device to control the elevation of a sealing assembly and thus initiate upward movement of the assembly relative to the lower edges of a pair of glass sheets
  • the detecting device as herein disclosed will be equally adapted for use to move a sealing assembly downwardly from an initial rest elevation.
  • a detecting device would be employed with an upper sealing assembly as well as a lower sealing assembly.
  • apparatus for sealing together the edge portions I of spaced glass sheets including means for supporting said sheets in spaced face-to-face relation, means for moving said sheet supporting means and the sheets supported thereby alonga definite path, sealing means arranged along said path, means fon-carrying said sealing means and supported for movement toward and away from said path, means for moving said carrying means, means for passing a fluid medium across said path, means.
  • said converting means includes an electrical circuit for controlling said impulses; and a differential pressure transducer-transmitter; said means for passing a fluid medium across said path comprises aconduit, means for supplying fluid under pressure to said conduit, and means restricting said conduit to a slot-like discharge passageway; said means for receiving said fluid medium comprises a conduit having a slot-like orifice leading thereto that is in substantial alignment with sad slot-like passageway from said first mentioned conduit; a pair of ears extend into said last mentioned conduit from opposite sides of said slot-like ope n ing; saiddifferential pressure transducer-transmitter comprises a chamber communicating with said fluid medium receiving means, a flexible diaphragm closing said chamber, an armature connected to said diaphragm for
  • apparatus for sealing together the edge portions of spaced glass sheets including means for supporting said sheets in spaced face-to-face relation, means for moving said sheet supporting means and the sheets supported thereby along a definite path, sealing means arranged along said path, means for carrying said sealing means and supported for movement toward and away from said path, means for moving said carrying means means'for passing a fluid medium acrosssaid path, means for receiving said fluid medium, and means for converting variations in the pressure of said received fluid medium into impulses which activate said moving means to move said carrying means and said sealing means toward and into and away from and out of sealing position with respect to the path of the marginal edge portions of said sheets; the improvement in which said converting means includes an electrical circuit for controlling said impulses; and a differential pressure transducer-transmitter comprising a chamber communicating with said fluid medium receiving means, a flexible diaphragm closing said chamber, an armature connected to said diaphragm for movement therewith, and a coil surrounding saidarmature and having a primary side connected to a source of power and a
  • said slotelectrical circuit further includes a manually adjustable potentiometer connected to a source of power and a motor for supplying power to said moving means, said connection from said demodulator to said amplifier is through an electrical network connected to said potentiometer, and said amplifier is connected to said motor.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US00052471A 1970-07-06 1970-07-06 Apparatus for producing all-glass multiple sheet glazing units Expired - Lifetime US3715198A (en)

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US5247170A 1970-07-06 1970-07-06

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US3715198A true US3715198A (en) 1973-02-06

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US (1) US3715198A (de)
AT (1) AT317463B (de)
BE (1) BE769497A (de)
CA (1) CA949750A (de)
CH (1) CH528448A (de)
DE (1) DE2134566A1 (de)
ES (1) ES392910A1 (de)
FR (1) FR2098175B1 (de)
GB (1) GB1345238A (de)
IE (1) IE35415B1 (de)
LU (1) LU63478A1 (de)
NL (1) NL7109339A (de)
NO (1) NO130153B (de)
ZA (1) ZA714339B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905841C2 (de) * 1979-02-15 1984-04-19 Josef Käuferle KG Stahlbau, 8890 Aichach Verfahren und Anlage zur Herstellung einer Verbundplatte
AT393830B (de) * 1988-01-11 1991-12-27 Lisec Peter Vorrichtung zum fuellen von isolierglas mit sondergas

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437603A (en) * 1943-12-18 1948-03-09 Bailey Meter Co Machine tool control
US2847625A (en) * 1954-07-09 1958-08-12 Honeywell Regulator Co Electrical control apparatus
US2954644A (en) * 1955-11-14 1960-10-04 Libbey Owens Ford Glass Co Apparatus for producing multiple sheet glazing units
US3147574A (en) * 1962-06-29 1964-09-08 Hupp Corp Dimensional control device
US3498109A (en) * 1966-07-08 1970-03-03 Int Computers & Tabulators Ltd Pressure to electrical transducers and apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR61821E (fr) * 1951-07-04 1955-05-18 Lampes Sa Perfectionnements aux douilles de lampes électriques
US2813535A (en) * 1956-04-03 1957-11-19 Askania Regulator Co Purged web edge detector
US2919712A (en) * 1956-05-25 1960-01-05 Gpe Controls Inc Fluid jet edge position detector
US3321838A (en) * 1965-07-29 1967-05-30 Owens Illinois Inc Gauging method and apparatus
US3454854A (en) * 1967-10-02 1969-07-08 Wallace & Tiernan Inc Inductive transducer with servo system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437603A (en) * 1943-12-18 1948-03-09 Bailey Meter Co Machine tool control
US2847625A (en) * 1954-07-09 1958-08-12 Honeywell Regulator Co Electrical control apparatus
US2954644A (en) * 1955-11-14 1960-10-04 Libbey Owens Ford Glass Co Apparatus for producing multiple sheet glazing units
US3147574A (en) * 1962-06-29 1964-09-08 Hupp Corp Dimensional control device
US3498109A (en) * 1966-07-08 1970-03-03 Int Computers & Tabulators Ltd Pressure to electrical transducers and apparatus

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AT317463B (de) 1974-08-26
DE2134566A1 (de) 1972-01-20
LU63478A1 (de) 1971-11-15
ES392910A1 (es) 1973-09-16
IE35415B1 (en) 1976-02-04
NO130153B (de) 1974-07-15
ZA714339B (en) 1972-03-29
CH528448A (de) 1972-09-30
GB1345238A (en) 1974-01-30
FR2098175B1 (de) 1975-07-11
NL7109339A (de) 1972-01-10
FR2098175A1 (de) 1972-03-10
IE35415L (en) 1972-01-06
BE769497A (fr) 1971-11-16
CA949750A (en) 1974-06-25

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AS Assignment

Owner name: LOF GLASS, INC.,OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIBBEY-OWENS-FORD COMPANY AN OH. CORP.;REEL/FRAME:004687/0980

Effective date: 19860320

Owner name: LOF GLASS, INC., 811 MADISON AVE., TOLEDO, OH 4369

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO CONDITION RECITED.;ASSIGNOR:LIBBEY-OWENS-FORD COMPANY AN OH. CORP.;REEL/FRAME:004687/0980

Effective date: 19860320