US3472087A - Reversible stepping mechanisms - Google Patents

Reversible stepping mechanisms Download PDF

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Publication number
US3472087A
US3472087A US715228A US3472087DA US3472087A US 3472087 A US3472087 A US 3472087A US 715228 A US715228 A US 715228A US 3472087D A US3472087D A US 3472087DA US 3472087 A US3472087 A US 3472087A
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US
United States
Prior art keywords
pawl
ratchet wheel
leg
tooth
teeth
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
US715228A
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English (en)
Inventor
Klaus Johannes Ylinen
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Individual
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Individual
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Filing date
Publication date
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Publication of US3472087A publication Critical patent/US3472087A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H31/00—Other gearings with freewheeling members or other intermittently driving members
    • F16H31/003—Step-by-step mechanisms for rotary motion
    • F16H31/005—Step-by-step mechanisms for rotary motion with pawls driven by a reciprocating or oscillating transmission member
    • 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

Definitions

  • a reversible stepping mechanism comprises a ratchet wheel having teeth of substantially isosceles triangle shape, and two solenoid-actuated drive pawls, one on either side of the diametral plane of the ratchet wheel, for selectively driving the ratchet wheel stepwise in either direction.
  • the pawls have tooth-contacting portions and are mounted resiliently in such a manner that they are bent out of the way of the teeth upon disengagement of the pawl from the teeth.
  • a stepping mechanism comprises a ratchet wheel whose teeth are engaged one by one by a pawl that has a portion which is resiliently mounted to be deflected by the next tooth upon withdrawal of the pawl from the ratchet wheel.
  • the present invention relates to stepping mechanisms, more particularly of the reversible type in which two pawls disposed on opposite sides of the diametral plane of a ratchet wheel selectively drive the wheel stepwise in either direction.
  • Another object of the invention is to provide such a mechanism which will be relatively simple and inexpensive to manufacture, easy to operate, maintain and repair, and rugged and durable in use.
  • FIGURE 1 is a view of a stepping mechanism according to the present invention.
  • FIGURE 2 is a fragmentary View of a portion of the structure of FIG. l taken perpendicular to the plane of symmetry of FIG. 1;
  • FIGURE 3 is an enlarged fragmentary view showing the relationship of one pawl to the ratchet wheel at the middle of the stepping motion
  • FIGURE 4 is a view similar to FIG. 3 but showing the relationship of a pawl to the ratchet wheel at the end of a stepping motion.
  • a bushing 1 is secured in a holding plate 2, and in the bushing 1 is rotatably mounted a shaft 3, to the end of which shaft is attached a ratchet wheel 4.
  • the wheel 4 is provided along its circumference with a series of teeth 5 of substantially isosceles triangle shape.
  • a solenoid coil 6 On each side of the ratchet wheel is mounted a solenoid coil 6 with an iron core 7.
  • the coils are secured to the plate 2, for example by means of a threaded journal arranged at one end of the core 7 and a nut screwed onto said journal.
  • the journal extends through a hole in a tab 2a bent perpendicularly from the base plane of the plate 2.
  • a yoke portion 8 is clamped with one leg between the solenoid coil 6 and the tab 2a. It has an intermediate portion 9 which is deilected perpendicularly from the leg,
  • the yoke portion 8 is completed with an armature 10 which is rockingly mounted at the end 0f the intermediate portion 9 opposite to said leg.
  • a pawl 11 is mounted on the armature 10. To the outer end of the pawl according to FIG. 1, which end extends beyond the corresponding end of the armature 10 and is slightly bent downwards (in FIG. 1), one end of a tension spring 12 is fastened, the other end of which is fastened to the intermediate portion 9. Owing to the traction of the spring 12, the end of the pawl 11 facing the ratchet wheel 4 is kept out of engagement with the teeth 5 of the ratchet wheel 4, as shown in FIG. l, when the solenoid is deenergized.
  • the last-mentioned end 13 of the pawl 11 is bent to U-shape, and between the legs of this U-shaped end is arranged one leg 14 of an Lshaped member 14, 15 which is rockingly mounted in a slot 16 close to the bottom or bend of the U-shaped end 13.
  • the other leg 15 extends through the slot 16, and at the outer end of said leg is fastened one end of a tension spring 17, the other end of which is fastened to the base portion of the pawl 11. Due to the ⁇ action of spring 17, the L-shaped portion is resiliently supported in the position shown in FIG. 1 when the free outer end of its leg 14 is not subjected to external force.
  • the member 14, 15 is thus rockingly mounted in the slot 16 at the transition between the legs 14, 15.
  • a leaf spring 18 bears against the ratchet wheel 4 in the manner shown in order to prevent motion of the wheel 4 at the nonoperative position shown in FIG. 1.
  • a stop pin 19 limits the motion of the pawl 11 in the direction away from the iron core 7.
  • the step mechanism operates as follows:
  • a current impulse to the solenoid coil 6 effects the attraction of the armature 10 by the iron core 7.
  • the pawl 11 moves together with the armature in the direction of the arrow 21 (FIG. 3), so that the outer end of the leg 14 is applied close to the tip of a tooth 5 and slides along the tooth tlank 20 (see FIG. 3) while turning the ratchet wheel 4 in the direction of the arrow 22.
  • the end of the leg 14 has reached the bottom of the tooth gap and turned said wheel through an angle 23 corresponding to half a tooth division.
  • the motion of the pawl 11 and ratchet wheel 4 continues to the position shown in FIG.
  • a stepping mechanism comprising a ratchet wheel mounted for rotation about its axis and having ratchet teeth thereon, a drive pawl engageable with the ratchet teeth one by one to rotate the ratchet wheel stepwise, and means for moving the pawl into and out of engagement with the ratchet teeth; the improvement comprising means resiliently supporting that portion of the pawl which contacts a ratchet tooth so that said pawl portion will be deliected by the next ratchet tooth during movement of the pawl away from the ratchet wheel, said pawl having a U-shaped end portion which opens toward the ratchet wheel, said pawl portion being rockable between the legs of said U-shaped end portion.
  • Mechanism as claimed in claim 1 and a spring acting against said pawl portion to urge said pawl portion endwise outwardly of said pawl.
  • said pawl having a base portion on which said U-shaped end portion is disposed, said resiliently supported pawl portion being in the form of an L-shaped member having one leg disposed between the legs of said U-shaped end portion and the other leg extending through a slot close to the bottom of the U-shaped end portion, and a spring in tension between said other leg and said base portion of the pawl.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Lock And Its Accessories (AREA)
US715228A 1967-03-23 1968-03-22 Reversible stepping mechanisms Expired - Lifetime US3472087A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE04116/67A SE327236B (enrdf_load_html_response) 1967-03-23 1967-03-23

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US3472087A true US3472087A (en) 1969-10-14

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US715228A Expired - Lifetime US3472087A (en) 1967-03-23 1968-03-22 Reversible stepping mechanisms

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US (1) US3472087A (enrdf_load_html_response)
DE (1) DE1750041A1 (enrdf_load_html_response)
ES (1) ES352281A1 (enrdf_load_html_response)
GB (1) GB1189383A (enrdf_load_html_response)
SE (1) SE327236B (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4805481A (en) * 1986-05-14 1989-02-21 C. Rob. Hammerstein Gmbh Self-locking revolute joint, adjustable to an angle by moving an activation lever back and forth
US20100237216A1 (en) * 2009-03-17 2010-09-23 Mircea Napau Power seat height adjuster mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946181U (enrdf_load_html_response) * 1972-07-31 1974-04-23

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2150680A (en) * 1936-10-07 1939-03-14 Eastman Kodak Co Timing device
US2377583A (en) * 1942-11-27 1945-06-05 Automatic Elect Lab Stepping mechanism
US2990723A (en) * 1958-06-02 1961-07-04 Admiral Corp Stepping switch
US2994227A (en) * 1958-02-13 1961-08-01 Philips Corp Relay for stepwise movement of a toothed member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2150680A (en) * 1936-10-07 1939-03-14 Eastman Kodak Co Timing device
US2377583A (en) * 1942-11-27 1945-06-05 Automatic Elect Lab Stepping mechanism
US2994227A (en) * 1958-02-13 1961-08-01 Philips Corp Relay for stepwise movement of a toothed member
US2990723A (en) * 1958-06-02 1961-07-04 Admiral Corp Stepping switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4805481A (en) * 1986-05-14 1989-02-21 C. Rob. Hammerstein Gmbh Self-locking revolute joint, adjustable to an angle by moving an activation lever back and forth
US20100237216A1 (en) * 2009-03-17 2010-09-23 Mircea Napau Power seat height adjuster mechanism
US8556762B2 (en) 2009-03-17 2013-10-15 Crh North America, Inc. Power seat height adjuster mechanism

Also Published As

Publication number Publication date
GB1189383A (en) 1970-04-22
DE1750041A1 (de) 1971-01-07
ES352281A1 (es) 1969-07-01
SE327236B (enrdf_load_html_response) 1970-08-17

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