US3187122A - Check operated time switch - Google Patents

Check operated time switch Download PDF

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Publication number
US3187122A
US3187122A US174802A US17480262A US3187122A US 3187122 A US3187122 A US 3187122A US 174802 A US174802 A US 174802A US 17480262 A US17480262 A US 17480262A US 3187122 A US3187122 A US 3187122A
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Prior art keywords
time
time switch
shaft
disk
control
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Expired - Lifetime
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US174802A
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English (en)
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Schmid August
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Individual
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F3/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
    • G04F3/02—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with mechanical driving mechanisms
    • G04F3/027—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with mechanical driving mechanisms using electrical contacts, e.g. for actuating electro-acoustic device
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F3/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
    • G04F3/06—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with electric driving mechanisms
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
    • G07F15/12—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity in which metering is on a time basis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/1836—Rotary to rotary

Definitions

  • This invention relates to a prepayment time switch, Whose running time is started by the insertion of a coin for an installation, particularly an automatic bowlingpin setting-up device, with a variable time availability.
  • the prepayment time switch is designed to keep in operation for a certain time interval per coin any installation, particularly one intended for public use, such as an electrically-operated bowling-pin setting-up device.
  • the time interval per coin shall thereby be adjustable in order to cater for varying electricity costs.
  • the prepayment time switch shall indicate externally visible details of the time interval per coin inserted and also the total time still available for operation oi the installation.
  • the prepayment time switch is principally characterized in that, by means of devices controlled by a clock, several equal and adjustable time availabilities of the installation are allotted to several time periods of the day which are adjustable with respect to both length and time of day.
  • FIG. l shows a front View of the prepayment time switch
  • FIG. 2 shows a front View according to FIG. l illustratinv the positions of the component parts
  • FIG. 3 is a top plan View partly in section showing the prepayment time switch
  • FIG. 4 is a sectional view showing a control shaft with sliding axle for an electric motor of the prepayment time switch
  • FIG. 5 is a sectional view showing a detail according to FlG. 4;
  • FIG. 6 is a cross section of the prepayment time switch, as developed.
  • FIG. 7 is a sectional View of a control shaft
  • FIG. 8 is a perspective View showing the control cams or the control shaft
  • FIG. 9 is a side View showing aodiaettilc control mechanism.
  • the prepayment time switch is accommodated within a substantially rectangular case 11.
  • the auxiliary means described hereinafter, providing automatic operation, are mainly arranged on axles or shafts that are xed to or journaled in two case walls on plates 13 and 14 which are spaced apart by three distancing bolts 12 (FIG. 2).
  • the front case wall 13 carries a control panel 15 having arranged thereon the means necessary for operating, adjusting, checking, etc. the prepayment time switch.
  • the prepayment time switch in the form shown shall record each coin inserted to operate the unit. Por this purpose a conventional register 16 is provided (NGS. 1 and 3).
  • the prepayment time switch shall, furthermore, permit the storage of several coins and thus a multiple of the time interval per coin available for operation ofthe unit without the same being switched oil. at the end of each time interval for each coin.
  • the number of coins stored in the prepayment time switch can be read YXZ Patented June 1, 1965 externally on a scale disc 17 (FIGS. l and 3). In the form shown a maximum storage of sixteen coins is possible, as may be seen from the graduations on the periphery of scale disk 17.
  • various time intervals available per coin for operation of the unit can be read on the control panel 15 of the prepayment time switch.
  • the time interval available for operation of the unit is read in minutes per coin on scale 1S for high tariff and on scale 19 for low tariff.
  • the time interval applying at any given moment is indicated on the index visible through window 2i) and is controlled by an ordinary clock 21 in accordance with the time of day (FIG. l).
  • the scales 17 to 21 visible in windows of control panel 1S are sections of dials which, on rotation, can only show part of the scale through the windows.
  • the control panel 15 has furthermore arranged thereon a slot 23 for the insertion of the coin, and button 24 for coin return with collector 25 for the rejected false coin (FiG. l).
  • the door 134 which swivels on hinges 133 is locked, so that only certain knobs and scales are accessible or visible to the user of the prepayment time switch (FIG. 3).
  • the operation of the prepayment time switch i.e. the cooperation of the time purchased by insertion of the coin with the normal elapse of the time of day is switched on by a rotary knob 26 (FIGS. l and 3). Operation of the prepayment time switch controls an electric Contact 22 through the position of which the unit, say, an automatic bowling-pin setting-up device, is switched either on or olf.
  • the shaft 31 together with the driving jaw 3i) attached thereto can only be rotated through a little more than 90, whereupon the nose 35 on the driving jaw 3i) rests against the stop 36 on the case (FIG. 3).
  • Shaft 31, driving jaw 3i? and rotary knob 26 are continuously urged against the stop 36 by an initially tensioned torsion spring 37 and can only be rotated clockwise against the action of the spring 37. Due to the friction coupling 32, only the rotary knob can be turned in either direction and through any angle exceeding the predetermined angle of rotation of slightly more than 90, thus preventing darnage to the apparatus as a result of incorrect handling from outside.
  • the shalt 29 is coupled by means of a pin 39 to a shaft 38 which is journaled in the rear case wall 14.
  • the shaft 29 is thus rotatably supported at one end in the rear case wall 14 over shaft 38 and, at the other end, on the butt end of shaft 31 (FlG. 3).
  • Said shaft 33 has fixed thereto a notched disk itl with two notches 41 displaced Iby PEG. 2).
  • a roller at the end of an arm 43 which is biased by a spring ft2 rests on said notched disk dit.
  • Said disk itl has two cams 45 distributed on its periphery between the notches 41 so that, upon insertion of a coin 46, the shaft 29 has to be turned by means of rotary knob 25 through approximately 90 only as a result of which the roller i4 rests on the notched disk just over the highest point of a cam 45, whereupon the further rotation of shaft 29 up to the engagement of roller 44 in the next notch i1 is automatically effected by the springbiased arm The shaft is therefore rotated through alst/,isa
  • a pinion d3 which is fixed to the shaft Et (FIG. 3) and preferably integral with shaft 29, is thus rotated through 180 for every passage of a coin from the coin tester 27 to the coin till i7 and drives the hollow wheel of a sun-and-planet gear Sti through a certain angle allotted to the coin inserted (FIG. 3).
  • the sun wheel 51. of the sun-and-planet gear Sti is mounted on shaft 5?; (FIG. 7) and is driven by a friction disk S5 over a gear train comprising the wheel pair 53 and S4 (FIGS. 3 and 7).
  • the friction disk is driven by the conical driving wheel 56 of an electric motor 57.
  • the friction disk 55 is driven with a variable transmission ratio for a constant speed of the electric motor 57; the speed of the sun wheel 511 of the snn-and-planet gear 5G may, therefore, be varied for constant speed of the electric motor 57 by axially displacing the electric motor S7 and, therewith, the driving wheel 56.
  • the momentary diameter of the driving wheel 56, on which the friction disk 55 runs, is, as described hereinafter, a criterion for the various time intervals indicated on scales 1S and 119 mounted on the control panel 15 (FGS. 1 and 2).
  • a different time interval for operation of the installation say, an automatic bowling-pin setting-up device, is allotted to every effective diameter of the driving wheel 56.
  • the electric motor 57 is mounted on an axle 6th which is journaled inthe case walls 1? and 1dby means of a bracket 59 with bearing boss 58 (FIGS. 4 and 6). Said axle 6h is displaceable endwise and rotatable for the purpose of shifting the electric motor 57 with respect to the friction disk 55. rThe amount of rotation is given by the various diameters of the driving wheel 56.
  • the endwise displacement of axle 6d represents the axial displacement of wheel S6 and is limited by two manually and selectively adjustable stops 61 and 62 (HG. 6). Said stops are carried respectively on rotatable right-hand threaded spindles 63 'and 6d, and on axle 6ft to secure them against rotation.
  • Said spindles are journaled in the case walls i3 and 14 and are adjustable by means of rotary knobs 65 and 66 (FlGS. 2 and 6). With these rotary knobs 65' and 66, therefore, the amount of displacement of the driving wheel 56 relative to the friction disk 55 and also the position of the range of displacement along the length of the driving wheel 56 is determined thereby.
  • the amount of play a of the bearing boss Sti (FiG. 6) between the stops 61 and 62 represents the momentary possible range of displacement of the driving wheel 56, and the position of the stops 61 and 62 on their spindles 63 and 64 respectively determines the position of the range of displacement a along the length of the driving wheel 56 (FGS. 3 and 6).
  • the knobs 65 and 66 are provided with teeth 67 and 68 respectively to drive the scale disks 1S and 19 which are similarly provided with teeth (FIGS. 2 and 6).
  • the scale disks 1S and 19 are set to the running timD of the prepayment time ⁇ switch as desired by the proprietor, i.e. the position of the stops 61 and 62 on their spindles 63 and 64, and the spacing of the stops 61 and 62 are set (FIG. 6).
  • the amount of play a of the bearing boss 5S as determined by the position of the stops 61, 62 is thus a measure of the difference in time indicated by scales 1S and 119.
  • a second electric motor 69 within the case 11 runs at constant speed and drives through interposed gearing a timing shaft 7@ which is journaled in the case walls 13 and 14 so that said timing y'shaft performs one revolution every 24- hours.
  • the pinion 71 of the electric motor 69 drives said shaft '76 over tie gear steps of toothed rims 72 to fill.
  • the toothed rims 75 and 76 form a freely rotating gearwheel on an intermediate axle 32.
  • the pairs of toothed rims 7S/7d and T7/7? each form a gearwheel also, each of which is freely rotatable on timing shaft '76 and secured against displacement by bearing spacers d3 and (FIG. 6).
  • the toothed rim 79 is coupled frictionally to toothed rim titi.
  • an axially displaceable spring-loaded thrust disk 87 which is secured against rotation, the toothed rim 79 is pressed against the gearwhecl body 132 and thus establishes a friction-tight drive to the toothed rim titi.
  • the scale disk 2i with indication of the time of day in hours is arranged on a disk fixed to the timing shaft "iti (NGS. 1 and 6).
  • a sector llill, freely rotatable on timing shaft 7d, is pressed under the action of plate springs i321, so that its teeth 136 engage the spur teeth E37 of disk 85, and is thus driven by the timing shaft 7i).
  • the sector 11i can, however, be rotatedand adjusted to any position with respect to disk SS against the action of plate springs 1131.
  • rPhe disk 235 has a rotary knob S6 by means of which the disk 35 with its dial can be set to the correct time of day, i.e., the gearwheel Sil and Si?
  • the method of displacing the electric motor 57 land therewith the axle 6@ dependent on the time of day is disclosed in the following.
  • the gearwheel '72 (FIG. 6) driven by the pinion 71 of the electric motor 69 drives frictionally the shaft 83 which is supported between the case walls 13 4and L14. This is accomplished by arranging the gearwheel 72 friction-tight between two disks 69 and 9@ which are fixed to the shaft 88, said disk 96* being urged against the gearwheel 72 by the action of a coil spring 91 which is supported on the case.
  • Said disk Si@ is coupled by means of pins 92 to a control shaft 93 which is xed to shaft 68.
  • arm 95 is therefore always greater than the amount by which the driving wheel S6 of electric motor 57 can be displaced.
  • the arm 99 swings through the amount of possible displacement of axle 6i? until the bearing boss 53 abuts on stop 61 or 62 (FIG. 6), the difference in these swinging distances being taken up by the torsion springs 1191 .on thc two-armed lever 9d.
  • a camdisk 104 is mounted on shaft S8 (FIGS. 4, 6 and 9).
  • Said camdisk 16M includes two cams ltl' and 1196 on its front face, which are displaced radially and diametrically to each other and extend over approximately halt the circumference (FlG. 9).
  • Said cams 1%5, 1% operate in conjunction with a ratchet 167 which is pivotally mounted on the case.
  • the ratchet 1617 carries a stop 168 and a nose 1119 which is urged against the periphery of disk 85 by the action of spring 11G (FIG. 9). Since the carndisk 104 is driven friction-tight clockwise by the electric motor 69 (FlG.
  • the stop 1% of ratchet 1117 lies on cam 105 so that the camdisk 104 and also the control shaft 93 are held against rotation.
  • the continuously driven gearwheel '72 rotates frictionally between the two stationary disks 89 and 9@ (FGS. 6 and 4).
  • the control shaft 93 is thus rotated and the driving wheel 56 of electric motor 57 is not displaced relative to friction disk 5S.
  • the cams 165 and 106 ot cam disk 164 are so disposed as to permit the ratchet 187 with its stop 1% to pivot radially inwards against the action of spring 11d, to then rest against cam 1% when a sector 111 strikes against the nose 199.
  • the peripheral angle of the ector 111 is preferably variable. This may be effected, say, by interchanging various sector pieces. Since the rotation of disk 35 is a measure or" the elapsed time, a certain peripheral angle of the sector 111 secured on disk corresponds to a certain number of hours.
  • the size of the peripheral angle 111 thereby represents the period of time during which the ratchet 1%7 is positioned on cam M15 .or respectively and is thus proportional to the running time of the electric motor 57 with a certain diameter of driving wheel Se' to friction disk S5.
  • the driving wheel 56 is displaced through the set distance a.
  • the angular position of sector 111 on disk Sd determines the time of day at which the driving wheel 55 is to be displaced.
  • the ratchet lili is pivoted anticlockwise by the sector 111 and comes to rest on cam (FG. 9).
  • the control shaft 93 is rotated through 180, and the driving wheel 56 is displaced through distance a.
  • the driving wheel 56 now runs with a certain diameter for as long as the nose 199 slides on the periphery of sector 111. At the end of this period the nose drops onto the periphery of disk and the control shaft 93 can again rotate through 186, whereupon the driving wheel Sd is pushed back through distance a and again drives the friction disk 55 with the same diameter as in the start position.
  • the low electricity tariff in force when the installation is completed applies for the period of time during which the nose 169 slides on the periphery of sector 111.
  • the sector 111 is thereby txed to the disk 85 in such a position that this low tariilC period applies to the hours of night operation for the example shown.
  • the installation operates at the high electricity tariff, and the driving wheel 56 runs with a diameter which produces a shorter running time of the prepayment time switch in a way to be described later.
  • the front Iface of the camdisk 104 is inscribed with the words High tarii and Low tariff, one of these designations being always visible through the window 2t? in the control panel of the prepayment time switch.
  • the control mechanism illustrated in FIG. 9 varies the speed of the friction disk 55 and therewith the speed of sunwheel 51 of the sun-and-planet gear 50 in accordance with the time of day.
  • the sun-and-planet gear 50 comprises two driving systems. On the one hand, as described hereinbefore, the hollow wheel 49 of said gear Si) is rotated by pinion 48 through .a certain angle per coin deposited (FlG. 3) and, on the other hand, the sunwheel 51 is continuously driven by electric motor 57, whereby the speed of the sun wheel 51 is variable by altering the diameter of the driving wheel 56. The direction of rotation of hollow wheel 49 is opposite to that of the sunwheel 51. Since the speed of the sunwheel is Variable, the speed of the planet-wheel carrier 112 (FIG.
  • Said carrier 112 is mounted on shaft 11.3 carrying the dial 17 (FIG. 1).
  • Said dial indicates, as already mentioned, the number of coins deposited in the prepayment time switch, which have not yet been compensated by a corresponding time availability for operation of the installation, and thus remain to the credit of the player or consumer.
  • the hollow Wheel 49 carries on its front face a ring of serrations 114 (FIG. 7) on which rests a push rod 115 which operates on the register 16 (FIG. 3). Every rota- ,y tion of the hollow wheel i9 through a certain amount, i.e. every coin accepted by the prepayment time switch, is thus recorded on register 16.
  • the rotation of the planet-wheel carrier 112 determines the running time of the prepayment time switch and thus the time availability of the automatic bowlingpin setting-up device.
  • One complete revolution of the planet-wheel carrier 112 corresponds to the maximum running time of the time switch and, in the example shown, is obtained with sixteen coins inserted in succession.
  • the planet-wheel carrier 112 is coupled by means of a pin 11d to two control cams 117 and 118 (FIGS. 7 and 8). Said control cams are freely rotatable on shaft 113 and have slots 119 and 12h through which the pin 116 extends.
  • the pin 116 is provided with grooves 123 and 12dv in which are clipped respectively coil springs 121 and 122, the other ends thereof engage the control cams 117 and 113. Each control cam can thus rotate with respect to the pin 116 through the length of the slot 119 or 12h respectively against the action of the coil spring 121 or 122 respectively.
  • the control cam 117 is provided on its periphery with a notch 125 and a thrust face 126. rl ⁇ he control cam 11d has only one notch 127, and the planet-wheel carrier 112 has only one thrust face 12S (FIG. 8).
  • control cams 117 and 11S and the planet-wheel carrier 112 cooperate with the spring-biased ratchets 129 and 131i so as to cause the latter to slide on the periphery of control cams 117, 11S and planet-wheel carrier 112 (FIGS. 8, 7).
  • the ratchet 129 thereby rests only on the planet-wheel carrier 112 and control cam 117, while the ratchet 131i rests only on the control cams 117 and 113 (PGS. 7 and 8).
  • the ratchet 129 gives the control cam 117 a snap-action movement which is disclosed as description proceeds. With this rotary movement the contact 22 is operated with a snap-action movement by ratchet 13@ (NGS. 2 and 8).
  • the position of the control cams 117 and 118, the planet-wheel carrier 112 and the ratchets 129, 13h as shown in FiG. 8 is that in which the prepayment time switch is switched off, since the contact 22 is open, so that the electric motor 57 is switched off and the automatic bowling-pin setting-up device is not in operation. 1f the prepayment time switch is to be switched on, a coin is deposited, whereupon the hollow wheel t9 of the sunand-planet ⁇ gear Sti rotates (PEG. 8). The planet-wheel carrier 112 is thereby caused to rotate at half the peripheral speed in the same direction, i.e. anticlockwise.
  • the control cams 117, 11S cannot rotate, since the spring-loaded ratchets 129 and 131D are engaged respectively in the notches 125 and 129. Simultaneously, the ratchet 129 lies on the thrust face 12d (FIG. 8). Rotation of the planet-wheel carrier 112 causes tensioning of the coil springs 121 and 122 of the control cams and 11S, and the ratchet 129 slides on the thrust face 123 and thus out of the notch 125.
  • control cam 117 When the ratchet 129 has moved clear of the notch 125, the control cam 117, by action of the tensioned coil spring 121, instantaneously rotates in the direction of rotation of the planetwheel carrier 112 until it is stopped by the pin 116 striking against the other end of the slot 119.
  • This snapaction rotary movement of control cam 117 causes the thrust face 126 to press down the ratchet 1.311 instantaneously, thus closing the contact 22.
  • the 1E@ also becomes disengaged from the notch 127 in control cam 11h and the latter rotates with a snapaction movement in the direction of rotation of the planet-wheel carrier 112 and thus also that of pin 116 until the other end of the slot 12@ strikes against the pin 116.
  • Closure of the contact 22 switches on the electric motor 57, whereupon the time purchased commences to elapse, and the installation, say, an automatic bowlingpin setting up device, is available for use.
  • the planetwheel carrier 112 driven by sunwhcel 51, rotates in a clockwise direction. Being coupled to the planet-wheel carrier 112 through pin 11d extending through the slots 119 and 12h, the cams 117 and 11S are also rotated until the ratchet 13) engages the notch 127. Shortly before this, the ratchet 129 engages the notch 125 so that, on the contact 22 opening and therewith on the automatic bowling-pin setting-up device being switched off, the ratchet 129 already lies in the notch 125, and the start position shown in FiG. 8 is again reached.
  • the prepayment time switch according to the invention many components, such as gearwheels, ratchets, hollow shafts, bearing bushes, etc. may be made of plastic material, so that cheap manufacture of the prepayment time switch with absolutely no maintenance is possible.
  • the frequency of automatic displacement of the driving wheel 5o may be increased in a simple manner by fixing several sectors 111 on the disk S5.
  • the general basic concept of the invention also includes the provision of the camdisk 1194 with a plurality of cams of a type similar to those 1% and 16e and displaced to each other whereby the peripheral angles of the cams may be different and as small as required (FIG. 9).
  • Check operated time switch with a time control particularly for an automatic bowling pin setting device with variable time changes comprising a motor mounted for adjustment axially thereof on an axle, a driving cone on the motor and operable thereby, a friction disk connected to contact the driving cone, adjustable means to shift the motor and cone on its axle through a distance depending upon the time of use as controlled by the number of checks used, and check control mechanism connected to the disk by gear elements to regulate the operation of the time interval available in dependence of the number of checks employed.
  • the adjustable means for the motor and cone includes a shaft to adjust the driving cone relative to the disk with the shaft being slidably mounted, and in which a cam and swing lever are provided connected to the shaft with means to rotate the cam.
  • a control shaft with an annular groove and two-armed lever are provided, and in which the adjustable means includes a bearing boss connected to the motor fixed to an axle between two stops whereby the control shaft has on its periphery an annular groove which is pitched so that one arm of the two-armed lever engages a shifting sleeve mounted on the axle, the bearing boss of the electric motor being fixed to the axle between two stops fixed with the distance between the stops adjustable by means of threaded spindles.
  • Check operated time switch in which a pair of spaced casing plates are provided for mounting the axle and adjustable means, and in which a plurality of shafts are rotatably mounted in the plates with a cam on one of the shafts to mount the check control mechanism.
  • a ratchet and a cam disk are provided to operate the check control mechanism.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
US174802A 1961-02-21 1962-02-21 Check operated time switch Expired - Lifetime US3187122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH219761A CH376065A (de) 1961-02-21 1961-02-21 Zeitkassierautomat

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Publication Number Publication Date
US3187122A true US3187122A (en) 1965-06-01

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Application Number Title Priority Date Filing Date
US174802A Expired - Lifetime US3187122A (en) 1961-02-21 1962-02-21 Check operated time switch

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US (1) US3187122A (de)
CH (2) CH219761A4 (de)
GB (1) GB974013A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581029A (en) * 1968-09-10 1971-05-25 Douglas G Noiles Tv on time control

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2209861B (en) * 1985-10-09 1989-12-28 Barcrest Ltd Operating system for a coin-freed machine
GB2569967A (en) * 2018-01-04 2019-07-10 Linde Ag Mechanic timer element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1957901A (en) * 1931-12-04 1934-05-08 Landis & Gyr Ag Coin reset time period control device
US2075056A (en) * 1932-05-07 1937-03-30 Frank S Rich Meter
US3082301A (en) * 1959-02-02 1963-03-19 Barmart Timing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1957901A (en) * 1931-12-04 1934-05-08 Landis & Gyr Ag Coin reset time period control device
US2075056A (en) * 1932-05-07 1937-03-30 Frank S Rich Meter
US3082301A (en) * 1959-02-02 1963-03-19 Barmart Timing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581029A (en) * 1968-09-10 1971-05-25 Douglas G Noiles Tv on time control

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Publication number Publication date
CH219761A4 (de) 1963-10-31
CH376065A (de) 1963-10-31
GB974013A (en) 1964-11-04

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