US2900840A - Stepwise operating driving device - Google Patents

Stepwise operating driving device Download PDF

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Publication number
US2900840A
US2900840A US701798A US70179857A US2900840A US 2900840 A US2900840 A US 2900840A US 701798 A US701798 A US 701798A US 70179857 A US70179857 A US 70179857A US 2900840 A US2900840 A US 2900840A
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US
United States
Prior art keywords
pawl
edges
driving device
guide surface
armature
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
US701798A
Inventor
Greve Reinhard Cornelis
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
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Publication of US2900840A publication Critical patent/US2900840A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/04—Multi-position wiper switches having wipers movable only in one direction for purpose of selection
    • H01H67/06—Rotary switches, i.e. having angularly movable wipers
    • 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
    • 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
    • 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
    • Y10T74/1558—Grip units and features
    • Y10T74/1584—Gripper mountings, slide
    • 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
    • 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
    • Y10T74/2141—Sliding pawls

Definitions

  • the pawl end co-operating with the pawl wheel and the guide surface is shaped in the form of a uniformly thick, flat pin.
  • the pawl is secured to a blade spring connected to the armature of an electro-magnet.
  • the blade spring permits the pin-shaped end of the pawl, when returning, of moving precisely in its direction of length.
  • the invention has for'its object to provide a driving device comprising a pawl of a simple shape, which is adapted to be connected directly with its driving memher.
  • the two pawl edges co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively are circular and the common centre of the edges lies in between them.
  • the structure according to the invention has the advantage that during the return movement of the pawl rotation of the pawl is permitted, so that the pawl may be connected directly to the armature of a magnet or a further driving member which performs a rotary movement.
  • the two said edges of the pawl may be caused to follow the same circle; it is often more advantageous to have a radius of the edge co-operating with the teeth of the pawl wheel which is smaller than that of the edge cooperating with the guide surface.
  • Fig. 2 shows, on an enlarged scale, part of the pawl wheel and the pawl end cooperating herewith in the device shown in Fig. 1.
  • reference numeral 1 designates the yoke of an electro-magnet 2, which is provided with an excitation coil 3.
  • An armature 4 is secured rotatably at the area 5 to one limb of the yoke l and is held spaced United States Patent apart from the other limb of the yoke, in the deenergized I state of the magnet 2, by a spring 6 secured to a fixed point 7.
  • the free end of the armature 4 is provided with a pawl 8, which is rotatably secured thereto.
  • the end 9 of this pawl co-operates with the teeth 10 of a pawl wheel 12, seated on a rotary shaft 11, and with the guide surface 13 of a stationary stop 14.
  • the pawl end 9 has two circular edges 15 and 16, which cooperate with the teeth 10 and the guide surface 13 respectively, said surface Patented Aug. 25, 1959 being substantially parallel to the tooth surface 17, in contact with the pawl end 9, during the return stroke of said pawl.
  • the circular edges 15 and 16 have a common centre 20 lying in between them.
  • the device described operates as follows. In the position shown the magnet 2 is not energized. The armature 4 and the pawl 8 occupy the extreme right-hand position owing to the spring 6. When the electro-magnet 2 is energized, the armature 4 is attracted by the yoke 1 against the force of the spring 6, the end 9 of the pawl 8 being thus moved to the left. The return pawl 19 prevents the pawl wheel 12 from being rotated against the direction of rotation indicated by the arrow P.
  • the circular shape of the edges 15 and 16 of the end 9 of the-pawl provides that the relative distance between the less steep tooth edge 17 and the guide surface 13 cannot be reduced, in spite of a slight rotation of the pawl 8 due to the rotation of the armature about the point 5.
  • the arrangement of the electro-magnet 2 is such that at the end of the stroke of the armature 4 the pawl with the edge 15 falls behind that tooth 10, of which the edge 17 forms part.
  • the pawl 8 falls into the next-following interstice between the teeth under the action of a blade spring 21, secured to the armature 4.
  • the armature 4 with the pawl 8 are moved again to the right by the spring 6, the pawl wheel 12 being thus rotated in the direction P over a tooth interspace until the next-following rest position is reached.
  • the circular shape of the edges of the end 9 of the pawl 8 permits the pawl of being displaced not only linearly but also rotatably. This permits a direct connection of the pawl with the armature and permits of choosing a comparatively small distance between the pivot point of the armature and the pivot point of the pawl.
  • the two circular edges 15 and 16 may form part of the same circle, the centre of which lies in the centre between the edge 17 and the guide surface 13. With the embodiment described the radius of the edge 15 is, however, smaller than that of the edge 16. This has the advantage that the pawl end 9, when the pawl 8 rotates, is less likely to be jammed against the steep edge of a tooth 10 at the beginning of the return motion.
  • the pawl 8 is preferably made of linear superpolyamide (nylon). This has the advantage both of a small wear and a low amount of noise during the operation of the device.
  • a stepwise driving device comprising a toothed pawl movement wherein said pawl co-acts with the teeth of said pawl wheel, a stationary stop member having a guide surface, said guide surface and said toothed edge being substantially parallel during the return stroke of said pawl, said pawl having two edges, said two edges of said pawl co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively, and said edges are curvilinear and the common center of said edges lies therebetween.
  • a stepwise driving device comprising a toothed pawl wheel, a pawl, means mounting said pawl for rocking movement wherein said pawl co-acts with the teeth of said pawl wheel, a stationary stop member having a guide surface, said guide surface and said toothed edge being substantially parallel during the return stroke of said pawl, said pawl having two edges, said two edges of said pawl co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively, said edges are curvilinear and the common center of said edges lies therebetween, and the radius of the edge co-aeting with the pawl wheel is smaller than'the radius of the edge coacting with said guide surface.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Description

Aug. 25, 1959 c; GREVE 2,900,840
STEPWISE OPERATING DRIVING DEVICE Filed Dec. 10, 1957 0 INVENTOR REINHARD CORNELIS GREVE BY M AG |T STEPWISE OPERATING DRIVING DEVICE Reinhard Cornelia Grev e, Hilversum, Netherlands, as-
signor to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware Application December 10, 1957, Serial No. 701,798
Claims priority, application Netherlands December 22, 1956 3 Claims. (Cl. 74-575) 'driven selectors for use in automatic telephone systems.
With a known drivingdevice of this kind the pawl end co-operating with the pawl wheel and the guide surface is shaped in the form of a uniformly thick, flat pin. In this case the pawl is secured to a blade spring connected to the armature of an electro-magnet. The blade spring permits the pin-shaped end of the pawl, when returning, of moving precisely in its direction of length.
The invention has for'its object to provide a driving device comprising a pawl of a simple shape, which is adapted to be connected directly with its driving memher.
In accordance with the invention the two pawl edges co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively are circular and the common centre of the edges lies in between them.
The structure according to the invention has the advantage that during the return movement of the pawl rotation of the pawl is permitted, so that the pawl may be connected directly to the armature of a magnet or a further driving member which performs a rotary movement.
The two said edges of the pawl may be caused to follow the same circle; it is often more advantageous to have a radius of the edge co-operating with the teeth of the pawl wheel which is smaller than that of the edge cooperating with the guide surface.
The invention will be described-with reference to the drawing, which shows one embodiment. In the drawmg- Fig. 1 shows diagrammatically a driving device according .to the invention, viewed in a direction transverse to the pawl wheel,
Fig. 2 shows, on an enlarged scale, part of the pawl wheel and the pawl end cooperating herewith in the device shown in Fig. 1.
Referring to Fig. 1, reference numeral 1 designates the yoke of an electro-magnet 2, which is provided with an excitation coil 3. An armature 4 is secured rotatably at the area 5 to one limb of the yoke l and is held spaced United States Patent apart from the other limb of the yoke, in the deenergized I state of the magnet 2, by a spring 6 secured to a fixed point 7. The free end of the armature 4 is provided with a pawl 8, which is rotatably secured thereto. The end 9 of this pawl co-operates with the teeth 10 of a pawl wheel 12, seated on a rotary shaft 11, and with the guide surface 13 of a stationary stop 14. The pawl end 9 has two circular edges 15 and 16, which cooperate with the teeth 10 and the guide surface 13 respectively, said surface Patented Aug. 25, 1959 being substantially parallel to the tooth surface 17, in contact with the pawl end 9, during the return stroke of said pawl. The circular edges 15 and 16 have a common centre 20 lying in between them.
With the teeth of the pawl wheel 12 co-operates, in addition, a pivotable return pawl 18, which is urged towards the teeth 10 by means of a blade spring 19.
The device described operates as follows. In the position shown the magnet 2 is not energized. The armature 4 and the pawl 8 occupy the extreme right-hand position owing to the spring 6. When the electro-magnet 2 is energized, the armature 4 is attracted by the yoke 1 against the force of the spring 6, the end 9 of the pawl 8 being thus moved to the left. The return pawl 19 prevents the pawl wheel 12 from being rotated against the direction of rotation indicated by the arrow P. The circular shape of the edges 15 and 16 of the end 9 of the-pawl provides that the relative distance between the less steep tooth edge 17 and the guide surface 13 cannot be reduced, in spite of a slight rotation of the pawl 8 due to the rotation of the armature about the point 5. This means, consequently, that the pawl wheel 12 cannot move in the direction P during the motion of the pawl 9 to the left. The arrangement of the electro-magnet 2 is such that at the end of the stroke of the armature 4 the pawl with the edge 15 falls behind that tooth 10, of which the edge 17 forms part.
As soon as the pawl end 9 passes by the said tooth, the pawl 8 falls into the next-following interstice between the teeth under the action of a blade spring 21, secured to the armature 4. When the energization of the electromagnet 2 is interrupted, the armature 4 with the pawl 8 are moved again to the right by the spring 6, the pawl wheel 12 being thus rotated in the direction P over a tooth interspace until the next-following rest position is reached. The circular shape of the edges of the end 9 of the pawl 8 permits the pawl of being displaced not only linearly but also rotatably. This permits a direct connection of the pawl with the armature and permits of choosing a comparatively small distance between the pivot point of the armature and the pivot point of the pawl.
The two circular edges 15 and 16 may form part of the same circle, the centre of which lies in the centre between the edge 17 and the guide surface 13. With the embodiment described the radius of the edge 15 is, however, smaller than that of the edge 16. This has the advantage that the pawl end 9, when the pawl 8 rotates, is less likely to be jammed against the steep edge of a tooth 10 at the beginning of the return motion.
The pawl 8 is preferably made of linear superpolyamide (nylon). This has the advantage both of a small wear and a low amount of noise during the operation of the device.
What is claimed is:
l. A stepwise driving device comprising a toothed pawl movement wherein said pawl co-acts with the teeth of said pawl wheel, a stationary stop member having a guide surface, said guide surface and said toothed edge being substantially parallel during the return stroke of said pawl, said pawl having two edges, said two edges of said pawl co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively, and said edges are curvilinear and the common center of said edges lies therebetween.
2. A stepwise driving device comprising a toothed pawl wheel, a pawl, means mounting said pawl for rocking movement wherein said pawl co-acts with the teeth of said pawl wheel, a stationary stop member having a guide surface, said guide surface and said toothed edge being substantially parallel during the return stroke of said pawl, said pawl having two edges, said two edges of said pawl co-operating with the teeth of the pawl wheel and the guide surface of the stop respectively, said edges are curvilinear and the common center of said edges lies therebetween, and the radius of the edge co-aeting with the pawl wheel is smaller than'the radius of the edge coacting with said guide surface.
3. A stepwise driving device as claimed in claim 1 wherein said pawl is constituted of a linear supeipolyamide.
References Cited in the file of this patent
US701798A 1956-12-22 1957-12-10 Stepwise operating driving device Expired - Lifetime US2900840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2900840X 1956-12-22

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FR (1) FR1188887A (en)
NL (2) NL93780C (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075055A (en) * 1959-06-11 1963-01-22 Mitchell A Hall Timer
US3095751A (en) * 1960-08-05 1963-07-02 George W Rapp High ratio double action stepper unit
US3192319A (en) * 1962-05-31 1965-06-29 Hogan Faximile Corp Facsimile phasing mechanism
US3434361A (en) * 1966-02-10 1969-03-25 Robert Blohm Magnetic stepping mechanism,especially for the feeding movements of grinding machines
US3501968A (en) * 1967-10-18 1970-03-24 Bliss Co Drive mechanism
US3543596A (en) * 1969-01-09 1970-12-01 Gulf & Western Industries Drive mechanism having improved locking means
US4152954A (en) * 1977-03-21 1979-05-08 P. R. Mallory & Co. Inc. Timing mechanism with coaxial drive system
US4267740A (en) * 1978-09-14 1981-05-19 Bbc Brown, Boveri & Co., Ltd. Shaft-turning device
US4536626A (en) * 1984-06-01 1985-08-20 The Singer Company Timer drive mechanism
US4769664A (en) * 1984-03-19 1988-09-06 Canon Kabushiki Kaisha Barrel driving device for camera
DE102004025590B4 (en) * 2004-05-25 2010-02-25 Lre Technology Partner Gmbh Mechanical rotation range limiter for limiting the angle of rotation of a shaft
US11725715B1 (en) * 2020-08-13 2023-08-15 Opsis Health, Inc. Advance and hold pawl actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736204A (en) * 1956-02-28 Indexing apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736204A (en) * 1956-02-28 Indexing apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075055A (en) * 1959-06-11 1963-01-22 Mitchell A Hall Timer
US3095751A (en) * 1960-08-05 1963-07-02 George W Rapp High ratio double action stepper unit
US3192319A (en) * 1962-05-31 1965-06-29 Hogan Faximile Corp Facsimile phasing mechanism
US3434361A (en) * 1966-02-10 1969-03-25 Robert Blohm Magnetic stepping mechanism,especially for the feeding movements of grinding machines
US3501968A (en) * 1967-10-18 1970-03-24 Bliss Co Drive mechanism
US3543596A (en) * 1969-01-09 1970-12-01 Gulf & Western Industries Drive mechanism having improved locking means
US4152954A (en) * 1977-03-21 1979-05-08 P. R. Mallory & Co. Inc. Timing mechanism with coaxial drive system
US4267740A (en) * 1978-09-14 1981-05-19 Bbc Brown, Boveri & Co., Ltd. Shaft-turning device
US4769664A (en) * 1984-03-19 1988-09-06 Canon Kabushiki Kaisha Barrel driving device for camera
US4536626A (en) * 1984-06-01 1985-08-20 The Singer Company Timer drive mechanism
DE102004025590B4 (en) * 2004-05-25 2010-02-25 Lre Technology Partner Gmbh Mechanical rotation range limiter for limiting the angle of rotation of a shaft
US11725715B1 (en) * 2020-08-13 2023-08-15 Opsis Health, Inc. Advance and hold pawl actuator

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Publication number Publication date
FR1188887A (en) 1959-09-25
NL213249A (en)
NL93780C (en)

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