US3752965A - Counting device - Google Patents

Counting device Download PDF

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Publication number
US3752965A
US3752965A US00266131A US3752965DA US3752965A US 3752965 A US3752965 A US 3752965A US 00266131 A US00266131 A US 00266131A US 3752965D A US3752965D A US 3752965DA US 3752965 A US3752965 A US 3752965A
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Prior art keywords
drum
higher order
drums
transfer
lower order
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US00266131A
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English (en)
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A Haydon
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Tri Tech Inc
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Tri Tech Inc
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Assigned to MANUFACTURERS HANOVER TRUST COMPANY reassignment MANUFACTURERS HANOVER TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TRI-TECH, INC., A CT CORP
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Assigned to TRI-TECH, INC. reassignment TRI-TECH, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CHEMICAL BANK
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/14—Design features of general application for transferring a condition from one stage to a higher stage
    • G06M1/143—Design features of general application for transferring a condition from one stage to a higher stage with drums

Definitions

  • Trl-Tech, Inc. Waterbury, Conn.
  • ABSTRACT A transfer counter in which the planetary gears for transferring motion from one register drum to another are maintained at a fixed distance from the axis of the drums by a generally cylindrical guide member between the drums.
  • Each drum includes a compensating cam and a drive pinion on the side of the drum facing the next higher order drum, and a driven gear on the side facing the next lower order drum.
  • a resiliently biased transfer arm is pivotally supported about an axis parallel to but spaced from the axis of rotation of the drums. The transfer arm is slidably connected to the guide member, while the planetary gears are rotatably carried by the guide member in meshing engagement with the adjacent drive pinion and driven gear.
  • the transfer arm pivots the guide member under the control of the cam to produce orbital movement of the planetary gears which exactly compensates for the tendency of the gears to rotate the higher order drum.
  • the resilient bias of the transfer arm acts on the guide member and the planetary gears to rapidly move the higher order drum to its next position.
  • This invention relates to counting devices and more particularly to transfer counters of the type having a plurality of counting elements and a transfer mechanism between each pair of elements for transferring motion from the lower order element to the higher order element.
  • each cam has a particular gear ratios and the surface contour of each cam such that, as a given drum in a decade counter, for example, rotates from its zero position to its nine" position, the next higher order drum remains stationary. As the given drum is rotated from its nine" to its zero" position, however, the planetary gearing actuates the higher order drum to move it through a 36 angle, thus advancing the higher order drum one digit.
  • the support arm for the planetary gearing is provided with a biasing spring which, during the movement of the given drum from zero" to nine,” gradually builds up and stores the necessary force to drive the higher order drum with substantial driving energy.
  • Prior transfer counters including those of the foregoing type, commonly employed a large number of component parts, each of which had to be separately fabricated and then arranged in subassemblies which in turn were interconnected to form the completed unit.
  • the desire for miniaturization dictated that the axial width of each drum be as small as practical.
  • the available space for the hubs of the drums was too small in many instances, and the drums exhibited a tendency to wobble or otherwise get out of alignment particularly after repeated use.
  • special fixtures were often required in order to place the individual parts in their correct relationship.
  • One general object of this invention is to provide a new and improved transfer counter.
  • Another object of this invention is to provide a counter of the character indicated in which the wobbling of the individual counting elements after repeated usage for the most part is eliminated.
  • a further object of the invention is to provide a transfer counter which may be quickly and easily assembled in a rapid and straightforward manner.
  • a still further object of this invention is to provide a transfer counter utilizing comparatively simple mechanical components which is economical to manufacture and thoroughly reliable in operation.
  • the counter comprises a plurality of indicia-bearing counting elements in the form of register drums in coaxial relationship with each other.
  • Each of the drums includes a compensating cam and a drive pinion on the side of the drum facing the next higher order drum, and a driven gear on the side facing the next lower order drum.
  • the cams and gears advantageously are integral with the corresponding drum to form but a single part.
  • a transfer arm is interposed between each pair of adjacent drums, and a biasing spring resiliently urges the arm toward the drums rotational axis. The transfer arm controls the orbital position of a pair of planetary gears in respective meshing engagement with the drive pinion on the lower order drum and the driven gear on the higher order drum.
  • the action of the transfer arm offsets the tendency of the planetary gears to drive the higher order drum, and the higher order drum remains stationary.
  • the biasing spring urges the transfer arm and the cooperating gears in a direction to rapidly drive the higher order drum to its next incremental position.
  • a guide member of unique configuration and arrangement is interposed between each pair of adjacent drums to maintain the rotational axis of the planetary gears at a fixed distance from the rotational axis of the drums and thus hold the gears in engagement with the corresponding drive pinion and driven gear.
  • the guide member replaces several of the parts of previous transfer counters of this type and exhibits other important advantages.
  • each of the drums is provided with a first hub on the side facing the next higher order drum and a second hub on the side facing the next lower order drum.
  • These hubs provide support for the guide members and serve to locate the members within the cylindrical flanges of the drums.
  • the planetary gears are rotatably carried adjacent the periphery of the guide member, while the transfer arm includes an integrally formed pin which is located in a radial slot in the guide member to permit sliding movement therebetween.
  • the arrangement is such that the various parts may be quickly and easily assembled in accurate alignment with one another.
  • FIG. 1 is a vertical sectional view of a clock-type transfer counter in accordance with an illustrative embodiment of the invention.
  • FIG. 2 is a sectional view taken generally along the line 2-2 in FIG. 1.
  • FIG. 3 is an exploded perspective view of certain portions of the counter.
  • FIG. 4 is a sectional view taken along the line 4--4 in FIG. 1.
  • FIG. 5 is a sectional view similar to FIG. 4 but showing portions of the counter in different positions.
  • FIG. 6 is a fragmentary sectional view taken generally along the line 6-6 in FIG. 2.
  • FIG. 7 is a perspective view of a guide member for the counter.
  • FIG. 1 of the drawings there is shown a transfer counter having a plurality of counting elements in the form of register drums 10-13.
  • the drums 10-13 are arrangedin progressively increasing order about a central shaft 15.
  • the counter is in the form of a digital clock, with the lowest order drum 10 representing tenths of minutes, the next pair of drums 11 and 12 representing minutes and the highest order drum 13 representing hours.
  • the peripheries of the drums include appropriate indicia 14 (FIG. 3) corresponding to the desired representation to provide a visible indication of the time shown by the counter.
  • the, drums may include suitable switch actuating means'to control an electrical circuit and thus produce coded signals corresponding to the angular positions of the drums.
  • Each of the drums 10-13 is of molded plastic construction.
  • the drums are of generally cup-shaped configuration and include indicia bearing flanges 16 and 160 about their outer peripheries which are spaced from the axis of the shaft 15 by integrally formed webs 17.
  • the flange 16a for the hour drum 13 is somewhat wider than the flanges 16 for the remaining drums to accommodate the additional digits.
  • the webs 17 are located with respect to the flanges 16 and 16a such that recesses 18 are formed in the portion of each drum which faces the next lower order drum. As will be more fully explained hereinafter, these recesses, in the interests of compactness, accommodatesubstantial portions of the various operating components of the counter.
  • each of the drums 10, 11 and 12 which faces the next higher order drum is provided with a compensating cam 20, a hub 21 and a drive pinion 22.
  • the opposite side of each of the drums 11, 12 and13, that is, the side facing the next lower order drum, is provided with a hub 23 and a driven gear 24.
  • These latter components are disposed wholly within the drum flanges 16 and 16a.
  • the cam 20, the hubs 21 and 23 and the gears 22 and 24 are all integrally molded with the corresponding drum web 17, such that all of these components on a given drum form a single integral part of the overall counter assembly.
  • the compensating cam 20 is disposed on the outer face of the drum.
  • the cam includes a major portion 26 of gradually increasing radius and a comparatively sharp step 27.
  • the hub 21 is located immediately adjacent the exposed face of the cam 20 and is of circular configuration, while the drive pinion 22 is positioned on the exposed face of the hub.
  • the hub 23 and the driven gear 24, on the other hand, are oriented on the opposite or inner face of the drum and are somewhat larger in diameter than the hub 21 and the pinion 22,-respectively.
  • a generally cylindrical guide member 30 of cage-type configuration Interposed between each pair of adjacent drums 10-13 is a generally cylindrical guide member 30 of cage-type configuration.
  • This guide member which is best illustrated in FIG. 7, includes two opposed faces 31 and 32 which are interconnected by a cylindrical portion 33 having an aperture 34 therein.
  • the faces 31 and 32 are provided with respective axial openings 35 and 36.
  • the opening 35 accommodates the hub 23 (FIG. 3) on the higher order drum, while the opening 36 accommodates the hub 21 on the adjacent lower order drum.
  • the guide member is freely rotatable relative to the drums and is disposed substantially entirely within the recess 18 in the higher order drum. With this arrangement, the flanges 16 and 16a of adjacent drums may be located in close proximity with one another to provide an extremely compact structure.
  • the guide member 30 is of molded' one-piece construction and advantageously is fabricated from synthetic plastic material.
  • Representative materials which are particularly suitable for this purpose include the acetol copolymer available commercially from the Celanese Corporation under its trademark CELCON, and the acetol homo-v polymer available commercially from E. l. DuPont de Nemours 8r. Co. under its trademark DELRIN.
  • materials of this type provide the necessary rigidity and yet have a degree of flexibility which makes it easier to assemble the cooperating parts.
  • the materials also exhibit extremely low coefficients of friction, with theresult that there is no need to lubricate the various bearing surfaces.
  • a keyhole-shaped aperture 37 is located in the guide member face 32.
  • the aperture 37 extends in a radially outward direction with its circular outer end 38 closely adjacent the periphery of the guide member.
  • the end 38 is in axial alignment with a corresponding aperture 39 in the opposite face 31.
  • the face 32 also includes a comparatively shallow slot 40 which extends inwardly from the periphery of the guide member and, as best shown in FIGS. 4 and 5, is spaced from the aperture 37 by about thirty degrees.
  • Theapertures 37 and 39 on the guide member 30 accommodate a planetary gear assembly 42 of one-piece plastic construction.
  • the assembly 42 includes a large diameter gear 43 and a small diameter gear 44 which protrude through the opening 34 and are in respective meshing engagement with the drive pinion 22 on the lower order drum and the driven gear 24 on the higher order drum.
  • An axle 45 is integrally molded with the gears 43 and 44. One of the protruding ends of the axle 45 is inserted in the aperture 39, while the opposite end is manually pressed into the aperture 37 and is held in place in the end portion 38 by a snap fit.
  • the assembly 42 is freely rotatable relative to the guide member 30, and the guide member maintains the rotational axis of the assembly at a fixed orbital distance from the rotational axis of the drums. This distance is such that the gears 43 and 44 are held in meshing engagement with the pinion 22 and the gear 24 at all times.
  • a stationary rod 47 (FIG. 2) is positioned in spaced parallel-relationship with the drum shaft 15.
  • the rod 47 pivotally supports three resiliently biased transfer mechanisms 50 which extend between the respective pairs of adjacent drums -13.
  • each of the mechanisms 50 comprises a transfer arm 51 which illustratively is molded from a plastic material similar to that used for the guide member 30.
  • the arm 51 includes a straight, rigid portion 52 having a sleeve 53 at one end which accommodates the rod 47.
  • the remaining portion 54 of the arm 51 is slightly more flexible and extends along an arc substantially concentric with the shaft 15.
  • the free end of the portion 54 is provided with an integrally formed pin 55. This pin is slidably disposed in the guide member slot 40.
  • a follower 57 is integrally formed with the transfer arm 51 at the point at which the arm portions 52 and 54 meet.
  • the follower 57 is in the form of a small protrusion which rests on the adjacent compensating cam 20 and is resiliently urged against the cam by a biasing spring 60.
  • the spring 60 is disposed around the rod 47 and bears against the transfer arm 51 to urge the arm in a clockwise direction, as viewed in FIGS. 4 and 5, toward the rotational axis of the drums.
  • the portion of the spring which acts on the arm is held in place by three protruding lugs 62 which are integrally formed with the arm.
  • the drive mechanism for the counter is best illustrated in FIGS. 1 and 2 and is powered by an electric motor 63 having a reduction gear box 64.
  • the gear box 64 includes an output pinion 65 which is connected to the driven gear 24 on the lowest order drum 10 through a reduction gear train including idler gears 66 and 67.
  • a wide variety of motors may be used to drive the counter, illustrative motors that are particularly advantageous are disclosed, for example, in A. W. Haydon U.S. Pat. Nos. 3,370,189, 3,469,132, 3,495,107, 3,495,] l l, 3,495,113 and 3,564,314.
  • the motor is an ac synchronous clock motor, and the reduction gearing is such that the lowest order drum 10 rotates continuously at one rpm, thus providing a visual reading to the nearest tenth of a minute.
  • the motor operates as .a stepper motor to advance the drum 10 in successive discrete increments.
  • the motor 65 is affixed to a mounting plate 68.
  • a second mounting plate 62 is disposed in spaced parallel relationship with the plate 68, and the two plates provide support for the drum shaft and the transfer arm rod 47.
  • the plates 68 and 69 are mounted on a face member 70 which is disposed about a portion of the periphery of the drums 10-13.
  • the member 70 includes a transparent insert 71 to enable the visual reading of the indicia on the drums.
  • a housing 72 is-disposed about the remaining portion of the counter and includes a suitable grommet 73 for the motor lead wires (not shown).
  • the drums 10-13 are freely rotatable about the shaft 15, and the guide members 30 are freely rotatable about the drums. During the rotation of the lowest order drum 10 in response to the drive motor 65, the
  • the compensating cam 20 urges the follower 57 away from the shaft 15 to pivot the transfer arm 51 in a counterclockwise direction, as viewed in FIGS. 4 and 5, about the rod 47 against the biasing force of the spring 60.
  • the movement of the arm 51 pivots the guide member 30 and the rotational axis of the gears 43 and 44 about the axis of the shaft 15.
  • the cam 20 is contoured such that the movement of the gears 43 and 44 exactly compensates for the tendency of the gears to drive the higher order drum, with the result that the higher order drum 11 remains stationary.
  • the follower 57 drops off the lobe of the cam 20.
  • the transfer arm 51, the guide member 30, and the axis of the planetary gears 43 and move rapidly in a clockwise direction, as viewed in FIGS. 4 and 5, under the action of the stored energy in the spring 60.
  • the movement of the gears 43 and 44 produces rapid rotation of the higher order drum 11 through a 36 angle to urge the drum from its zero position to its one position.
  • the arrangement is such that the pivotal movement of the guide member 30 is controlled by the transfer arm 51, and the transfer arm's movement in turn is controlled by the compensating cam 20 and the spring 60.
  • the rotational axis of the planetary gears 43 and 44 is fixed relative to the guide member, and the guide member thus determines the orbital position of the planetary gears while at the same time maintaining the gears in engagement with the corresponding drive pinion 22 and the driven gear 24 during the operation of the higher order drum.
  • the construction and arrangement of the guide member and the cooperating transfer arm enable the elimination of such ancillary parts as radius arms, cam rollers, bushings, etc. commonly employed in counters used heretofore.
  • the transfer mechanism 50 between the drums 11 and 12 advances the drum 12 one step for each revolution of the drum 11.
  • the drum 12 has six incremental positions, corresponding to tens of minutes.
  • the transfer mechanism 50 between the drum 12 and the highest order drum 13 also advances the drum 13 from one incremental position to the next in response to each revolution of the drum 12.
  • the drum 13 is provided with 12 incremental positions corresponding to the hours of a standard clock, or with 24 incremental positions for a 24 hour clock.
  • the counter may be readily set to the correct time through the use of manually operable thumb wheels 75 and 76.
  • the wheels 75 and 76 protrude through corresponding openings 78 and 79 in the face member and respectively cooperate with the lowest order drum 10 and the highest order drum 13.
  • the wheel is rotatably supported on the mounting plate 68 and is in meshing engagement with an idler pinion 80 carried by a stub shaft 81.
  • a gear 82 is integral with the pinion 80 and meshes with a pinion 83 on the adjacent face of the drum 10.
  • the thumb wheel 76 is rigidly affixed to the web 17 of the highest order drum 13.
  • the wheel 76 surrounds an extemalhub portion 85 of the drum 13, and the wheel and the drum are rotatable as a unit about the central shaft 15.
  • the guide member hub 23 and the driven gear 24 for the drum 13 are formed on a separate connecting member 87.
  • the connecting member 87 likewise is rotatable relative to the shaft and includes a ratchet connection 89 for permitting slippage between the member 87 and the hub portion 85.
  • the connecting member 87 moves in response tothe transfer mechanism 50 between the drums l2 and 13, and similar motion is imparted to the drum 13 through the ratchet connection 89.
  • the thumb wheel 76 is rotated to locate the drum in the desired position.
  • slippage occurs between the hub portion 85 and the member 87 as a result of the connection 89, and the various transfer mechanisms and remaining drums remain in their initial positions.
  • the biasingspring 60 acts directly on the transfer arm 51 toresiliently urge the follower 57 against the cam 20.
  • the resilient bias is provided by a scissors-type spring (not shown) which engages the guide member 30*to urge the member in a clockwise direction, as viewed in FIGS. 4 and 5.
  • the rotational bias applied to the member 30 is transferred to the transfer arm through the protruding pin 55.
  • a counting device comprising, in combination:
  • a plurality of counting elements including a lower order element and a higher order element
  • lower order element including drive means and the f higher order element including driven means; means for operating said lower order element; resiliently biased transfer means interconnecting said drive means and said driven means for operating the higher order element in response to operation of the lower order element and in predetermined,
  • a counting device comprising, in combination:
  • a plurality of adjacent counting elements including a lower order element and a higher order element, the lower order element including drive means and the higher order element including driven means;
  • resiliently biased transfer means interconnecting said drive means and said driven means for operating the higher order element in response tooperation of the lower order element and in predetermined relationship therewith;
  • motion modifying means movable with said lower order element and cooperating with said transfer means for rendering the same ineffective to transfer motion to said higher order element except during selected'portions of the operation of said lower order element;
  • a counting device comprising, in combination:
  • a plurality of counting elements including a lower order element and a higher order element, the lower order element including drive means and the higher order element including driven means;
  • resiliently biased transfer means interconnecting said drive means and said driven means for operating the higherorderelement in response to operation of the lower order element andv in predetermined relationship therewith;
  • a counting device comprising, in combination; I, a plurality of register drums including alower order.
  • a counting device as defined in claim 4, in which the resiliently biased transfer means comprises:
  • a transfer arm pivotally supported about an axis spaced from the axis of rotation of the drums, the transfer arm being slidably connected to said guide member.
  • a counting device comprising, in combination:
  • a plurality of counting elements including a lower order element and a higher order element, the lower order element including drive means and the higher order element including driven means;
  • transfer means interposed between each pair of adjatransfer means inteconnecting said drive means and cent elements for operating the higher order elesaid driven means for operating th hi h order ment only during selected portions of the operation element in response to operation of the lower order of the lower Order element; and el ment a d i d t i d l i hi h means including a guide member interposed between with; each pair of adjacent elements and supported by motion modifying means movable with said lower the first and Second PP means on the elementsorder element and cooperating with said transfer in said Pair, Said guide member maintaining Said means for rendering the same ineffective to transtransfer in engagement W the drive means fer motion to said higher order element except duroh the lower order element and the drive" means ing selected portions of the operation of said lower on higher Order elementorder element; and 11.
  • a transfer counter comprising, in combination: means including a guide member supported by both a P i' of g e drums rranged in progressively said lower order element and said higher order elemcreasmg order m relaflonshll? f ment for maintaining said transfer means in enf l each of the drums mdudmg mcfnon modlfy' gagement with said drive means and said driven mg "F first supPon means i dnve means means during said operation of the higher order elthe i thefeof facmg the next higher order ement. and including second support means and driven 7.
  • a counting device comprising, in combination: il d h side thel'eof facing the lower a plurality of counting elements including a lower or order element and a higher order element of means for rotating the driven means on the lowest molded plastic construction in facing relationship (def drum; h I f with each other, the lower order element having "if?
  • a transfer counter comprising, in combination:
  • the resiliently biased transfer means comprises a transfer arm of molded plastic construction, and means for resiliently urging the transfer arm into engagement with the motion modifying means.
  • a transfer counter comprising, in combination: a plurality of indicia bearing counting elements arranged adjacent one another in progressively increasing order, each of the counting elements ineluding motion modifying means, first support means and drive means on the side thereof facing the next higher order element, and including seceach pair of adjacent drums for operating the higher order drum only during selected portions of the operation of the lower order drum; and
  • means including a generally cylindrical guide member interposed between each pair of adjacent drums and supported by at least one of the support means on the drums in said pair, said guide member maintaining said transfer means in engagement with the drive means on the lower order drum and the driven means on the higher order drum.
  • a transfer counter as defined in claim 12, the first and second supportmeans comprising cylindrical hubs coaxialwith said drums, said guide member being supported for rotation about said hubs.
  • a transfer counter comprising, in combination:
  • each of the drums including motion modifying means, first support means and drive means on the side thereof facing the next higher order drum, and including second support means and driven means on the side thereof facing the next lower order drum;
  • each of the transfer means including a transfer arm pivotally supported about an axis parallel to but spaced from the axis of rotation of the drums, said transfer means rotating said higher order drum only during selected portions of the rotation of the lower order drum;
  • a transfer counter comprising, in combination:
  • each of the drums including a first hub and drive means on the side thereof facing the next higher order drum, and including a second hub and driven means on the side thereof facing the next lower order drum;
  • transfer means interposed between each pair of adjacent drums for rotating the higher order drum only during selected portions of the rotation of the lower order drum; and t means including a guide member interposed between each pair of adjacent drums and supported for rotation about the first and second hubs on the drums 'in said pair, said guide member maintaining said transfer means in engagement with the drive means on the lower order drum and the driven means on the higher order drum.
  • a transfer counter comprising, in combination:
  • each of the drums including a first hub and a drive pinion on the side thereof facing the next higher order drum, and including a second hub and a driven gear on the side thereof facing the next lower order drum;
  • each of the transfer means including a pair of planetary gears in respective meshing engagement with the drive pinion on the lowest order drum and the driven gear on the higher order drum, to enable operation of said higher order drum only during selected portions of the operation of said lower order drum;' and means including a guide member interposed between each pair of adjacent drums and supported for rotation about the first and second hubs on the drums in said pair, said planetary gears being rotatably carried by said guide member, said guide member maintaining said planetary gears in respective meshing engagement with the drive pinion on the lower order drum and the driven gear on the higher order drum.
  • a transfer counter comprising, in combination:
  • each of the drums including a first hub and a drive pinion on the side thereof facing the next higher order drum, and including a second hub and a driven gear on the side thereof facing the next lower order drum, said hubs, pinions and gears being integrally formed with the corresponding drum;
  • each of the transfer means including integrally formed planetary gears in respective meshing engagement with the drive pinion on the lower order drum and the driven gear on the higher order drum and including a transfer arm pivotally supported about an axis parallel to but spaced from the axis of rotation of the drums, to enable operation of said higher order drum only during selected portions of the operation of said lower order drum;
  • said means including a generally cylindrical guide member interposed between each pair of adjacent drums and supported for rotation about the first and second hubs on the drums in said pair, said planetary gears being rotatably carried adjacent the periphery of said guide member and said transfer arm being slidably connected to said periphery, said guide member maintaining said planetary gears in respective meshing engagement with the drive pinion on. the lower order drum and the driven gear on the higher order drum.
  • a transfer counter comprising, in combination:
  • each of the drums including a compensating cam, a first hub and a drive pinion on the side thereof facing the next higher order drum, and including a second hub and a driven gear on the side thereof facing the next lower order drum, said cam, hubs, pinions and gears being integrally formed with the corresponding drum;
  • each of the transfer means including integrally formed planetary gears in respective meshing engagement with the drive pinion on the lower order drum and the driven gear on the higher order drum, including a transfer arm pivotally supported about an axis parallel to but spaced from the axis of rotation of the drums, and

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission Devices (AREA)
  • Measurement Of Distances Traversed On The Ground (AREA)
  • Electromechanical Clocks (AREA)
  • Retarders (AREA)
US00266131A 1972-06-26 1972-06-26 Counting device Expired - Lifetime US3752965A (en)

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US26613172A 1972-06-26 1972-06-26

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US (1) US3752965A (zh)
CA (1) CA985241A (zh)
DE (1) DE2305950C3 (zh)
FR (1) FR2191173B1 (zh)
GB (1) GB1398053A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918252A (en) * 1974-03-06 1975-11-11 Tri Tech Digital clock or other counting device with resilient coupling means in the drive train
US4142096A (en) * 1977-11-11 1979-02-27 Lehnert Daryl A Events accumulator device and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069083A (en) * 1959-01-28 1962-12-18 Haydon Switch Inc Transfer counter
US3223322A (en) * 1964-08-07 1965-12-14 Tri Tech Transfer counter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069083A (en) * 1959-01-28 1962-12-18 Haydon Switch Inc Transfer counter
US3223322A (en) * 1964-08-07 1965-12-14 Tri Tech Transfer counter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918252A (en) * 1974-03-06 1975-11-11 Tri Tech Digital clock or other counting device with resilient coupling means in the drive train
US4142096A (en) * 1977-11-11 1979-02-27 Lehnert Daryl A Events accumulator device and method

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Publication number Publication date
GB1398053A (en) 1975-06-18
DE2305950A1 (de) 1974-01-17
CA985241A (en) 1976-03-09
DE2305950C3 (de) 1975-05-22
FR2191173B1 (zh) 1976-06-11
DE2305950B2 (de) 1974-09-19
FR2191173A1 (zh) 1974-02-01

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Owner name: MANUFACTURERS HANOVER TRUST COMPANY

Free format text: SECURITY INTEREST;ASSIGNOR:TRI-TECH, INC., A CT CORP;REEL/FRAME:004448/0451

Effective date: 19850705

AS Assignment

Owner name: TRI-TECH, INC., CONNECTICUT

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:006850/0424

Effective date: 19931229