US3184982A - Driving device for impulse counter - Google Patents

Driving device for impulse counter Download PDF

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Publication number
US3184982A
US3184982A US287062A US28706263A US3184982A US 3184982 A US3184982 A US 3184982A US 287062 A US287062 A US 287062A US 28706263 A US28706263 A US 28706263A US 3184982 A US3184982 A US 3184982A
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US
United States
Prior art keywords
ratchet wheel
pawls
wheel
driving device
pawl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US287062A
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English (en)
Inventor
Auer Ulrich Wolfgang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe des Compteurs de Geneve SODECO
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Societe des Compteurs de Geneve SODECO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Societe des Compteurs de Geneve SODECO filed Critical Societe des Compteurs de Geneve SODECO
Application granted granted Critical
Publication of US3184982A publication Critical patent/US3184982A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/065—Electromechanical oscillators; Vibrating magnetic drives
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/04—Design features of general application for driving the stage of lowest order
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/04—Design features of general application for driving the stage of lowest order
    • G06M1/041—Design features of general application for driving the stage of lowest order for drum-type indicating means
    • G06M1/042—Design features of general application for driving the stage of lowest order for drum-type indicating means with click devices
    • 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
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1553—Lever actuator
    • Y10T74/1555—Rotary driven element
    • Y10T74/1556—Multiple acting
    • 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
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets

Definitions

  • This invention relates to a driving device for impulse counters, wherein the reciprocating motion of an actuating member actuated by the electrical impulses to be counted, preferably the oscillation of the movable armature of an electromagnet excited by the impulses, is converted into the progressive rotation of the cipher rolls of a counter through a double pawl arrangement cooperating with a ratchet wheel, in such a manner that during the movement of the actuating member in one direction, one pawl rotates the ratchet wheel through half a step and during the movement in the other direction, the other pawl continues the rotation of the ratchet wheel through a further half step in the same direction.
  • Such known devices operate by means of a rigid double lever pivotable about an axle, the said lever being connected to the movable armature of an electromagnet and having two lever arms with pawls arranged on opposite sides of the ratchet wheel circumference.
  • a socalled star wheel is used as the ratchet wheel in which the pawls of the said lever arms mesh.
  • the object of the present invention is to provide a driving device, which can be manufactured cheaply in large numbers and can be easily mounted and in which jolts due to the impact of the pawls on the tooth flanks of the ratchet wheel are avoided. Furthermore, in the device according to the invention only a small stroke of the recip- 3,134,932 Patented May 25, 1965 rocating parts is required; this stroke corresponds only to the travel required for one half counting step. As a result, on the one hand the current consumption of the electromagnet preferably used as actuating device is re Jerusalem, and on the other hand even impulse sequences with a high impulse frequency can be counted.
  • base member, mounting attachment and both levers (each terminating in a pawl) of the double pawl arrangement form a common structural unit manufactured from a plastic material which is elastic in the hardened state, both pawls being permanently in engagement with the ratchet wheel, whilst the base member is secured to the actuating member, preferably to the movable armature of an electromagnet, and means are provided to prevent rotation of the ratchet wheel through more than one half step on every pawl movement.
  • the structural part comprising both pawl levers may thus be made according to the invention in one working operation as a simple casting from a casting resin or even as a moulded part, has no rotatable shafts, and on mounting needs only to be connected to the movable armature of an electromagnet.
  • the ratchet wheel itself is also made of plastic.
  • FIGURES 1 and 2 show a side view of the embodiment in both end positions which can be occupied by the double pawl arrangement.
  • the driving device comprises the double pawl arrangement 1, the ratchet wheel 12 driving the cipher rolls of a counter not illustrated and the locking wheel 17.
  • the double pawl arrangement consists of a base member 2, a mounting attachment 3 and the two levers 4 and 5 with their ends designed as driving pawls.
  • the structural part 1 constitutes a single part made from plastic material, which can be manufactured cheaply and in large numbers as a casting, for example.
  • the plastic used must have a certain elasticity in the hardened state, in order that on the one hand the base member 2 with the levers 4 and 5 can bear in a resilient manner against the mounting attachment 3, and on the other hand the levers themselves can be in elastic relation to the base member.
  • these parts are joined by webs 8 and 9, 1t), respectively.
  • the base member 2 itself sufficient rigidity without making it too thick, its edges and central part are provided with ribs 2.
  • Two holes I]. serve for securing the double pawl arrangement l by means of screws to the casing of a counter, not shown.
  • the hole diameter is preferably kept somewhat larger than the screw diameter, so that the position of the pawls relatively to the ratchet wheel. 12 as well as the necessary spring force required by the elasticity of the double pawl arrangement can be easily adjusted.
  • the two pawls d and 7 engage the circumference of the ratchet wheel 12, which has a toothed rim in saw tooth form, in which the larger flanks 13 extending substantially tangentially to the ratchet wheel are suitably curved. The purpose of these curved tooth flanks will be discussed later.
  • a larger ratchet wheel 15 On the shaft 14 of the ratchet Wheel 12 and rigidly connected therewith is arranged a larger ratchet wheel 15, which is in engagement with a locking wheel 17 rotatable about the shaft 16.
  • the toothed rim of the locking wheel 11.7 meshing with the ratchet wheel 15 has eight teeth, only four of which can be seen in the drawing, whilst the other four are located exactly behind the four projections 12% which are arranged on the face of the locking wheel 17 nearest the observer and project partly into a recess 19 in the base member 2 of the double pawl arrangement.
  • the shafts l4 and 16 of ratchet wheel 12 and 15 and locking wheel 17, respectively, are mounted in the casing, not shown, of a counter.
  • On the shaft 14 are located, for example, behind the ratchet wheel 15 the cipher rolls arranged in a known manner of a decimal counter, the cipher roll of which indicating the units may be rigidly connected to the ratchet wheel 15.
  • the ratchet wheel 12, the ratchet wheel 15 and the locking wheel 17 are also made of plastic.
  • the structural part 1 is connected to the driving actuating member, which is usually the movable armature of an electromagnet.
  • the driving actuating member which is usually the movable armature of an electromagnet.
  • an appendage 22 of this armature of the electromagnet indicated by a coil 32 in FIGURE 1 is secured in a recess on the base member of the structural part l.
  • the double pawl arrangement and the movable armature part of the electromagnet are in their rest position in FlGURE l, whilst in FIGURE 2 the pos, -on of the movable armature and hence of the double pawl arrangement is shown in the attracted state of the armature.
  • the bending point about which the base mem -er 2 and the levers tand 5 rotate relatively to the mounting attachment 3, is located in the web 8, the cross section of which is made to this end substantially smaller than the cross sections of the base member and the mounting attachment.
  • the four projections 18 of the locking wheel project into the recess 1? of the pawl arrangement, so that the projection indicated in FIGURE 2 at 155 abuts against the edge 34 or" the recess 19 on continuation of the rotation in anti-clockwise direction and locking wheel and ratchet wheel 12 are thus locked.
  • the edge of the recess 19 indicated in FIGURE 1 at 33 prevents further rotation of the locking wheel 1?, as its projection 18 shown in FTGURE 1 would abut against this edge 33.
  • the levers dand 5 are angled oil at the bending points 9 and it) by an angle differing through ninety degrees relatively to the longitudinal axis of the double pawl arrangement.
  • the bending point of the levers situated at the places of maximum curvature at 9 and it? has in each case a distance from the straight line passing through the horizontal diameter of the locking wheel which is greater than the radius of the ratchet wheel 12.
  • the force exerted on the pawl end during the driving of the ratchet wheel 12 acts in a direction tangential to the ratchet wheel and produces owing to the described position of the bending points of the lovers a torque which tends to rotate the pawl 6 or 7 which is driving at the time in a direction towards the centre of the ratchet wheel 12 and in this way ensures a secure engagement of the pawl in the toothed rim.
  • the non-driving pawl undergoes, owing to the torque exerted by the friction force on the pawl lever a force component reducing the contact pressure on the ratchet wheel 12.
  • the tooth flanks 13 of the ratchet wheel 12 extending approximately radially are not flat but are curved. In this way the height of the radial flanks and hence the deflection of the levers directed radially to the ratchet wheel 12 during rotation of the ratchet wheel through one tooth graduation are also kept small.
  • the result is obtained that the radial deflection and hence the increasing of the internal stress of the levers is an at least substantially linear function of the angle of rotation of the ratchet wheel.
  • the driving device described is characterized by simple manufacture and assembly, as the one-part double pawl arrangement requires neither a rotatable shaft nor a combination of parts. Further, the torque necessary for actuatin' the device is very small, as only slight friction resistances have to be overcome between the pawls and the ratchet Wheel flanks as Well as the small deformation resistance of the pawl arrangement. This small torque in conjunction with the small working stroke permits the use of weak electromagnets.
  • a driving device for electric impulse counters of the type comprising a base member, an actuating member to which the electric impulses to be counted impart a to-andfro movement, a ratchet wheel for operating the counter, a plastic member mounted on said base for flexible deformation by said actuating member and having two pawls in engagement with said ratchet wheel for rotatively driving same, said driving device being characterized by the fact that each of said two pawls is mounted at the extremity of a lever, said two levers which are integral with, and protrude from, said actuating member, being oppositely turned and substantially parallel to the direction of displacement of said actuating member, said two pawls being substantially tangent to the periphery of said ratchet W1 eel and diametrally positioned with respect to said wheel, locking means being provided to limit the amount of rotation of said ratchet wheel by the respective pawls as said plastic member is flexed and restored.
  • a driving device for electric impulse counters as claimed in claim 1 comprising a gear wheel mounted to rotate with said ratchet wheel and a locking wheel meshing therewith and mounted on said base member, the movement of said locking wheel checked by said plastic member when the required amount of rotation has been effected.
  • a driving device for electric impulse counters of the type comprising a base member, an actuating member to which the electric impulses to be counted impart a to-andfro movement, a ratchet wheel for operating the counter, a plastic member mounted on said base for flexible de formation by said actuating member and having two pawls in engagement with said ratchet wheel for rotatively driving same, said driving device being characterized by the fact that the said actuating member is the movable armature of an electro-rnagnet and that each of said two pawls is mounted at the extremity of a lever, said two levers which are integral with, and protrude from, said movable armature, being oppositely turned and substantially parallel to the direction of displacement of said movable armature, said two pawls being substantially tangent to the periphery of said ratchet wheel and diametrally positioned with respect to said wheel, locking means being provided to limit the amount of rotation of said ratchet wheel by the respective pawl
  • a driving device for electric impulse counters of the type comprising a base member, an actuating member to which the electric impulses to be counted impart a to-andfro movement, a ratchet wheel for operating the counter, a plastic member mounted on said base for flexible deformation by said actuating member and having two pawls in engagement with said ratchet wheel for rotatively driving same, said driving device being characterized by the fact that the said actuating member is the movable armature of an electric magnet and that each of said two pawls is mounted at the extremity of a lever, said two levers which are integral with, and protrude from, said movable armature, being oppositely turned and substantially parallel to the direction of displacement of said 20 movable armature, said two pawls being substantially tangent to the periphery of said ratchet wheel and diametrally positioned with respect to said wheel, locking means being provided to limit the amount of rotation of said ratchet wheel by the respective pawls as

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Transmission Devices (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US287062A 1962-07-14 1963-06-11 Driving device for impulse counter Expired - Lifetime US3184982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH850562A CH398133A (de) 1962-07-14 1962-07-14 Antriebsvorrichtung für Impulszähler

Publications (1)

Publication Number Publication Date
US3184982A true US3184982A (en) 1965-05-25

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ID=4341297

Family Applications (1)

Application Number Title Priority Date Filing Date
US287062A Expired - Lifetime US3184982A (en) 1962-07-14 1963-06-11 Driving device for impulse counter

Country Status (5)

Country Link
US (1) US3184982A (de)
AT (1) AT243543B (de)
CH (1) CH398133A (de)
DK (1) DK108799C (de)
GB (1) GB987159A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112278A (en) * 1976-11-23 1978-09-05 Cherry Electrical Products Corp. Push button switch
US4270399A (en) * 1979-06-15 1981-06-02 Eaton Corporation Counter drive mechanism
US4506147A (en) * 1984-03-14 1985-03-19 Standard Car Truck Company Hubodometer adapted for selectable gear ratios
US5685112A (en) * 1994-09-29 1997-11-11 Fara; Mark C. Apparatus and method for removing structural parts of a building without contaminating adjacent areas

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979028A (en) * 1932-10-20 1934-10-30 Teleregister Corp Pawl and ratchet mechanism
GB624331A (en) * 1947-07-03 1949-06-02 William Donald Douglas Improvements in or relating to lever systems, apparatus incorporating lever systems and a method of fabricating lever systems
US2943512A (en) * 1956-07-30 1960-07-05 American Nat Bank And Trust Co Switch ratchet structure
US3142149A (en) * 1962-05-16 1964-07-28 Gen Electric Drive mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979028A (en) * 1932-10-20 1934-10-30 Teleregister Corp Pawl and ratchet mechanism
GB624331A (en) * 1947-07-03 1949-06-02 William Donald Douglas Improvements in or relating to lever systems, apparatus incorporating lever systems and a method of fabricating lever systems
US2943512A (en) * 1956-07-30 1960-07-05 American Nat Bank And Trust Co Switch ratchet structure
US3142149A (en) * 1962-05-16 1964-07-28 Gen Electric Drive mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112278A (en) * 1976-11-23 1978-09-05 Cherry Electrical Products Corp. Push button switch
US4270399A (en) * 1979-06-15 1981-06-02 Eaton Corporation Counter drive mechanism
US4506147A (en) * 1984-03-14 1985-03-19 Standard Car Truck Company Hubodometer adapted for selectable gear ratios
US5685112A (en) * 1994-09-29 1997-11-11 Fara; Mark C. Apparatus and method for removing structural parts of a building without contaminating adjacent areas

Also Published As

Publication number Publication date
AT243543B (de) 1965-11-10
CH398133A (de) 1965-08-31
DK108799C (da) 1968-02-12
GB987159A (en) 1965-03-24

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