US3907198A - Resettable counter - Google Patents

Resettable counter Download PDF

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Publication number
US3907198A
US3907198A US460068A US46006874A US3907198A US 3907198 A US3907198 A US 3907198A US 460068 A US460068 A US 460068A US 46006874 A US46006874 A US 46006874A US 3907198 A US3907198 A US 3907198A
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US
United States
Prior art keywords
drive
gear
counter
gear coupling
spur
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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
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US460068A
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English (en)
Inventor
Heinz Kelch
Helmut Muller
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Individual
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Individual
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Publication date
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Publication of US3907198A publication Critical patent/US3907198A/en
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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
    • G06M1/28—Design features of general application for zeroising or setting to a particular value
    • G06M1/283—Design features of general application for zeroising or setting to a particular value with drums
    • 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
    • G06M1/06—Design features of general application for driving the stage of lowest order producing continuous revolution of the stage, e.g. with gear train

Definitions

  • ABSTRACT A drive shaft drives a counter wheel system through a gear coupling device with the aid of a step-up drive between the drive shaft and the coupling device and a step-down drive between the coupling device and the counter wheel system.
  • the step-down drive has a transmission ratio which is the inverse of the transmission ratio of thc step-up drive.
  • FIG.1 A first figure.
  • This invention relates to counters which can be reset, for example to zero, after a countings'operation; Such counters have been used particularly in fluid meters. They have been subject to the problem that a considerable counting error is caused by -the .recoupling of the gear coupling device pursuant to each uncoupling and resetting operation.
  • Another object is to provide a resettable counter which can be recoupled, persuant to uncoupling for resetting, with a recoupling error of considerably less than one two-hundredth of the input counter wheel pe riphery.
  • a further object is to provide such a counter which at the same time can be constructed simply and inexpensively.
  • the invention provides a gear coupling device for a resettable counter with a step-up drive (that is a speed-up transmission) for driving one of the coupling gears and with a step-down drive (that is a speed reducing transmission) driven by the second coupling gear.
  • the step-up transmission uses a speed-up ratio of approximately I to 4 and the reduction gearing which follows uses a speed reduction ratio of 4 to I.
  • a shaft 1 is driven, for example, by a fluid-flow respon'sive device such as a flow meter (not shown). Rigidly mounted on shaft 1 is a spur gear 2 which accordingly rotates in a plane normal to shaft 1. Gear 2 according to the invention constantly meshes with a pinion 3 and continuously drives this pinion so long as the flow meter and shaft 1 rotate.
  • Pinion 3 is pivoted to a lever 4 which can rock on shaft 1.
  • a spring 5 biases this lever 4 toward the left, as viewed in FIG. 1, against a stop 6.
  • a pivot 7, pivoted to lever 4 and rigid with pinion 3, is also rigid with a coupling spur gear 8, which in turn normally meshes with a second coupling spur gear 9, the coupling gears 8 and 9 being advantageously larger than pinion 3 and being of uniform size.
  • a shaft 10, rigid with the second coupling gear 9, is also rigid with a pinion 11 which in turn meshes with drive gear 12 of the input counter roller 13 of the counter, this gear 12 being four times larger than its drive pinion 11.
  • gears 2 and 3 provide a step-up drive ahead of gear coupling 8 and 9, whereas the gears 11 and 12 provide inverse step-down speed conversion.
  • the recoupling error of up to one-half of a gear tooth, existing at the coupling point between gears 8 and 9, is in effect reduced to a quarter of its value, that is to one-eighth of a tooth of gear 12 upon the speed reduction by the step-down drive 11, 12.
  • the above-mentioned typical tolerance of about one five-hundredth of the periphery of gear 12 is now exceeded by the new gear drive system.
  • the system is simple and inexpensive to build, using the illustrated spur gears 2, 3; 8, 9; and ll, 12, all rigid with and normal to their respective shafts.
  • lever 4 with coupling gear 8 is moved towards the right as shown by arrow 6a in FIGS. 1 and 2. This movement causes uncoupling of coupling gears 8 and 9. Also, if desired, the uncoupling movement of gear 8 may be limited by a brake roll 14. The movement of lever 4 and gear 8 can be effected manually or by any desired mechanism (not shown).
  • coupling gears 8 and 9 can have the crowns of their teeth provided with bevelled extensions 15, 16. It will be appreciated that these extensions provide a cam action between any one tooth of driving coupling gear 8 and a tooth of driven coupling gear 9 which may happen to be positioned opposite the driving tooth at the moment of recoupling. In this way, meshing of the gear coupling apparatus can be achieved without interference or blocking of the teeth regardless of the exact relative positions of the gear teeth.
  • a resettable counter comprising counter wheel means; drive means for driving the counter wheel means; gear coupling means between said drive means and said counter wheel means movable between an engaged position for driving said counter wheel means by said drive means and a disengaged position for allowing resetting said counter wheel means; a step-up drive between said drive means and said gear coupling means; and a step-down drive between said gear coupling means and said counter wheel means to minimize errors caused by reengagement of said gear coupling means after the latter has been disengaged for resetting said counter wheel means.
  • stepup and step-down drives are gear drives.
  • said gear coupling means comprises a pair of spur gears having bevelled extensions on their tooth faces to facilitate said reengagement.
  • stepdown drive has a transmission ratio which is the inverse of the transmission ratio of said step-up drive.
  • said drive means comprises a first spur gear arranged for continuous rotation; said gear coupling means comprising two spur gears in a plane parallel to said first spur gear; and including a lever pivotable about the axis of said first spur gear and a pinion on said lever and meshing with said first spur gear and one of said two spur gears of said gear coupling means coaxial with said pinion, said first spur gear and said pinion constituting said step-up drive; and means connected to said lever for biasing the latter in a direction for holding said two gears of said gear coupling in engagement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Structure Of Transmissions (AREA)
  • Transmission Devices (AREA)
  • Gear Transmission (AREA)
US460068A 1973-04-17 1974-04-11 Resettable counter Expired - Lifetime US3907198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2319369A DE2319369C3 (de) 1973-04-17 1973-04-17 Zählerantrieb

Publications (1)

Publication Number Publication Date
US3907198A true US3907198A (en) 1975-09-23

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ID=5878375

Family Applications (1)

Application Number Title Priority Date Filing Date
US460068A Expired - Lifetime US3907198A (en) 1973-04-17 1974-04-11 Resettable counter

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US (1) US3907198A (de)
DE (1) DE2319369C3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380100C (zh) * 2005-05-10 2008-04-09 宁波市科技园区长源电子有限公司 一种计量仪表的读数机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US979437A (en) * 1909-06-21 1910-12-27 Marshall Cornine Index.
US1477536A (en) * 1923-12-18 Schaft
US2081693A (en) * 1933-06-29 1937-05-25 Frank M Ashley Counting register

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1477536A (en) * 1923-12-18 Schaft
US979437A (en) * 1909-06-21 1910-12-27 Marshall Cornine Index.
US2081693A (en) * 1933-06-29 1937-05-25 Frank M Ashley Counting register

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380100C (zh) * 2005-05-10 2008-04-09 宁波市科技园区长源电子有限公司 一种计量仪表的读数机构

Also Published As

Publication number Publication date
DE2319369C3 (de) 1978-10-05
DE2319369B2 (de) 1975-10-02
DE2319369A1 (de) 1974-11-07

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