US3408875A - Power-operated tool - Google Patents

Power-operated tool Download PDF

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Publication number
US3408875A
US3408875A US621992A US62199267A US3408875A US 3408875 A US3408875 A US 3408875A US 621992 A US621992 A US 621992A US 62199267 A US62199267 A US 62199267A US 3408875 A US3408875 A US 3408875A
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US
United States
Prior art keywords
cam
power
trigger
teeth
operated tool
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
US621992A
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English (en)
Inventor
Briskman Arthur
Theodore N Saaty
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Individual
Original Assignee
Individual
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
Publication date
Application filed by Individual filed Critical Individual
Priority to US621992A priority Critical patent/US3408875A/en
Priority to DE19671553664 priority patent/DE1553664A1/de
Priority to DE19671728467 priority patent/DE1728467A1/de
Priority to GB53924/67A priority patent/GB1154610A/en
Priority to CH1729567A priority patent/CH470939A/de
Priority to FR1568870D priority patent/FR1568870A/fr
Application granted granted Critical
Publication of US3408875A publication Critical patent/US3408875A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades
    • A01G3/037—Secateurs; Flower or fruit shears having motor-driven blades the driving means being an electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B15/00—Hand-held shears with motor-driven blades
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18232—Crank and lever
    • Y10T74/1824—Slidable connections

Definitions

  • Another object of the present invention is to provide a drive mechanism in power-driven shears which may be set, by a simple operation of a trigger lever, for various modes of operation.
  • Yet another object of the invention is to provide a power-operated shear which will operate with a shearing motion similar to hand operated shears.
  • the invention includes a selective intermittent motion device as a drive between two rotary motions on same axis or shaft, one above or adjacent to the other.
  • the utilization of a curved slot provides controlled variable torque from a rotating driven stud due to difference in arcs of driving and driven members.
  • This feature provides more drive power to the relatively reciprocating members, such as shear blades, as the cutting load moves to the tips of the blades, when added drive power is needed.
  • the mechanically timed tool operates from a 24-volt transformer inserted along a line cord as a unit of the cord or its plug with the current being rectified into D.C.
  • a driving gear is provided upon which is rotatably mounted cam means having teeth.
  • a driven disk having a projection or pin.
  • a trigger is placed in operating position for normal cycle with cut, dwell, cut, dwell, etc. When the cam means associated with the drive means is in idle position, the cam does not engage the said pin.
  • the cam has two oppositely disposed high teeth and two oppositely disposed low teeth.
  • a limiting button is provided which is adapted to be pressed.
  • FIG. 1 is a partial section of the device, taken along the line I-I in FIG. 2;
  • FIG. 2 is a side view of the device with the cover thereof removed and with some parts removed for the sake of clarity;
  • FIG. 3 is an exploded perspective view of the drive mechanism
  • FIG. 4 is a schematic view of the drive reversing switch
  • FIG. 5 is a partial section of an interchangeable pair of scalloping shear blades as shown
  • FIG. 6 is a side view of an interchangeable pair of straight scissors blades
  • FIG. 7 is a side view of an interchangeable pair of sheet metal snips
  • FIG. 8 is a side view, partially in sections, of the mechanism for changing the mode of operation set for intermittent cutting operation
  • FIG. 9 is a side view, partially in section, of the mechanism shown in FIG. 8 set for stopping the motion of the blades while the motor keeps running;
  • FIG. 10 is a side view, partially in section, of the mechanism shown in FIG. 8, set for continuous motion of the blades;
  • FIG. 10a is a detail perspective of the cam wheel mounted on a gear driven by the motor shaft.
  • FIGS. 1 and 2 poweroperated shears designated by the general numeral 100.
  • the shears therein depicted as pinking shears have a stationary member or blade 11 and a movable member or blade 12, the latter being pivotally mounted on a stud 13.
  • Stationary blade 11 is fastened to a housing 14 by a screw 15.
  • Housing 14 which may be made of any suitable material, for example of aluminum, encloses the electric drive motor 16 and the operating mechanism which is driven by motor 16, and which is constructed as follows:
  • a gear 17 is fastened on a shaft 18.
  • Gear 17 is driven by a pinion 19 which is mounted on a short intermediate shaft 20 which also carries a worm-gear 21.
  • a worm 22 is mounted on a shaft 23 of motor 16, so that wormgear 21 is engaged and is driven by worm 22.
  • a sleeve or hub 24 is arranged on shaft 18 adapted to freely rotate about shaft 18.
  • Sleeve 24 carries on the upper end thereof a disk 25, and carries on the lower end thereof a lever 26.
  • Disk 25 has a cam follower roller 27, mounted on a certain radius.
  • Roller 28 engages a curved slot 28 of a plate or extension 29 which is fastened on movable blade 12 by a screw 30.
  • the kinematic chain comprised of disk 25, roller 27, slot 28 and plate 29 performs a slider-crank motion upon rotation of disk 25, and consequently shear blade 12 is swingably moved about pivot stud 13.
  • a cam member or wheel 31 is rotatably located on gear 17.
  • Cam wheel 31 has two oppositely disposed long or high ratchet teeth 32, 33 arranged 180 degrees apart from one another, and has two oppositely disposed short or low ratchet teeth 34, 35 positioned at 90 degrees with respect to long teeth 32, 33 as shown in FIGS. 8, 9 and 10.
  • Two cam walls 36, 37, separated by a slot 38 are provided on a cam wheel 31. Slot 38 is arranged in the direction of the center line drawn through long teeth 32, 33.
  • Lever 26 has a pin or like protrusion 39 projecting at a right angle over the end of lever 26, at such radius that pin 39 may pass through slot 38 when cam wheel 31 is in the position shown in FIG. 8, or may be driven by either cam wall 36 or 37 when rotatable wheel or cam member 31 is in the position shown in FIG. 9.
  • a pawl lever 40 is pivotally located outside of gear 17.
  • Lever 40 has a finger 41 on the end thereof, which can be brought into engagement with long ratchet teeth 32, 33 or with short ratchet teeth 34, 35, or may be withdrawn so that it may not engage any of the ratchet teeth.
  • a spring 42 is attached to lever 40 for urging the latter continuously to disengaged or withdrawn position.
  • a cam 43 At the rear of lever 40, substantially opposite finger 41, is a cam 43 which is engaged by the rounded nose 44 of a trigger 45, which is pivotally mounted in housing 14.
  • a spring 46 is attached to trigger 45, urging the latter into the position shown in FIG. 9, when it is not pulled.
  • An axially movable button 47 is located in housing 14,
  • button 47 has a cutout 49, by which trig er may be pulled into an ultimate position, as shown in FIG. 10, when button 47 is pressed.
  • a second spring-loaded pushbutton 50 which has a small stem 51.
  • stem 51 abuts against-the back of trigger 45 and forces it into such position where finger 41 would not rotate cam wheel 31 because it would not contact the ratchet teeth.
  • an abutment of pushbutton 50 operates a microswitch 52 which is a reversing switch of the kind shown in FIG. 4.
  • microswitch 52 which is a reversing switch of the kind shown in FIG. 4.
  • motor 16 may be reversed when the shear blades are jammed by an obstacle.
  • Blades 11 and 12 can easily be exchanged with scalloping shear blades 53, straight scissors blades 54, metal snips 55, or any other type of cutting blade.
  • other use of the motorized tool could be made by simply exchanging the blades with other tools such as riveting prongs or the like (not shown in the drawing).
  • pawl lever 40 is withdrawn entirely by Spring 42 so that finger 41 no longer contacts any of the ratchet teeth of cam wheel 31. Whichever wall, 36 or 37, is in contact with pin 39, will remain in contact therewith, and the motion of the shear blade becomes a continuous one.
  • Power-operated tool comprising a stationary member, a housing, a pivotally mounted movable member, said movable member being arranged for engagement with said stationary member, a motor, drive means connecting said motor with said movable member, cam means in said housing associated with said drive means, and means for indexing said cam means for imposing a reciprocating motion upon said movable member.
  • said drive means including an intermittent motion device cooperable with said cam means providing a drive between two rotary motions on a common axis One adjacent to the other.
  • said cam means having two substantially diametrically opposed relatively long teeth and two substantially diametrically opposed relatively short teeth, said teeth being positioned substantially ninety degrees from each other, respectively, said cam means having spaced arcuate walls with a passage therebetween.
  • said cam indexing means comprising pivotal trigger means, a portion of which projects from said housing for engagement by an operator and pivoted lever means adapted to engage the teeth of said cam means, said lever means having a cam surface adapted to be engaged by said trigger means.
  • said cam indexing means comprising pivoted trigger means, a portion of which projects from said housing for engagement by an operator and pivoted lever means adapted to engage the teeth of said cam means, said lever means having a cam surface adapted to be engaged by said trigger means.
  • said cam indexing means comprising pivoted trigger means, a portion of which projects from said housing for engagement by an operator and pivoted lever means adapted to engage the teeth of said cam means, said levermeans having a cam surface adapted to be engaged by said trigger means.
  • said drive means comprising a shaft, a sleeve on said shaft, said sleeve freely rotatable on said shaft, a disk mounted one one end of said sleeve, a lever arm mounted on the other end of said sleeve, a pin at the end of said lever arm, a cam follower roller mounted on said disk, and a plate pivotally mounted on said housing together with said movable member, said plate having a curved slot, said follower roller engaging said slot for swingably moving said plate, and said movable member being attached to said plate.
  • cam means comprising a cam wheel rotatably mounted on said gear, cam walls on said cam wheel adapted to leave a passage therebetween, at least two relatively long ratchet teeth on said cam wheel, at least two relatively short ratchet teeth on said cam wheel, said long and said short teeth alternatingly arranged on said cam wheel, said cam walls driving said pin of said lever upon contact, said passage being wide enough to enable said pin to pass when said cam wheel has been indexed.
  • said cam indexing means comprising a pawl lever outside said gear, said pawl lever having a finger, said finger adapted to selectively intercept said long and said short teeth of said cam wheel, said pawl lever having a cam face on the side opposite said finger, at spring-loaded trigger, said trigger pivotally mounted in said housing, said trigger having a rounded nose, said nose engaging said cam face of said pawl lever, and a first releasable spring-loaded button located in said housing, said button constituting a stop for said trigger.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Scissors And Nippers (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Knives (AREA)
US621992A 1967-03-09 1967-03-09 Power-operated tool Expired - Lifetime US3408875A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US621992A US3408875A (en) 1967-03-09 1967-03-09 Power-operated tool
DE19671553664 DE1553664A1 (de) 1967-03-09 1967-11-10 Durch einen Elektromotor betriebene Schere
DE19671728467 DE1728467A1 (de) 1967-03-09 1967-11-10 Motorgetriebenes schneidwerkzeug, insbesondere schere
GB53924/67A GB1154610A (en) 1967-03-09 1967-11-27 Power Operated Tool.
CH1729567A CH470939A (de) 1967-03-09 1967-12-07 Elektrisch angetriebenes Werkzeug
FR1568870D FR1568870A (de) 1967-03-09 1968-01-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US621992A US3408875A (en) 1967-03-09 1967-03-09 Power-operated tool

Publications (1)

Publication Number Publication Date
US3408875A true US3408875A (en) 1968-11-05

Family

ID=24492514

Family Applications (1)

Application Number Title Priority Date Filing Date
US621992A Expired - Lifetime US3408875A (en) 1967-03-09 1967-03-09 Power-operated tool

Country Status (5)

Country Link
US (1) US3408875A (de)
CH (1) CH470939A (de)
DE (2) DE1553664A1 (de)
FR (1) FR1568870A (de)
GB (1) GB1154610A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536976A (en) * 1967-03-09 1970-10-27 Arthur Briskman Power-driven electronically controlled tool
US3787742A (en) * 1972-03-07 1974-01-22 Arvin Ind Inc Electric shears
US4173069A (en) * 1978-05-24 1979-11-06 Kett Tool Co. Power shear head
US4602431A (en) * 1985-01-31 1986-07-29 Keel Gayle M Haircutting shears
FR2584566A1 (fr) * 1985-07-15 1987-01-16 Delmas Daniel Secateur automatique pour la taille de la vigne, arbres et autres...
US5058276A (en) * 1990-04-16 1991-10-22 Parker William H Hedge trimmer
US5867909A (en) * 1996-04-27 1999-02-09 J. Wagner Gmbh Branch shears tool
US6044564A (en) * 1996-04-27 2000-04-04 J. Wagner Gmbh Branch cutter tool
US6226875B1 (en) * 2000-02-19 2001-05-08 Sheau Pyng Lii Grass shears
US20040118257A1 (en) * 2002-12-16 2004-06-24 Kratzmaier Konstructionen Gmbh Motor-driven cutting device
USD559052S1 (en) 2006-07-06 2008-01-08 Benard Voelker Battery-operable pruning device
EP1969919A1 (de) * 2007-03-14 2008-09-17 Robert Bosch Gmbh Schneidewerkzeuge
EP2158805A1 (de) * 2008-08-26 2010-03-03 Robert Bosch GmbH Gemüseschneidewerkzeug
US20110061242A1 (en) * 2009-09-15 2011-03-17 Chervon Limited Electric shears
US20110314680A1 (en) * 2009-03-06 2011-12-29 Positec Power Tools (Suzhou) Co., Ltd. Shearing Tool
WO2012048286A2 (en) 2010-10-08 2012-04-12 Milwaukee Electric Tool Corporation Powered cutting tool
US9339938B2 (en) 2010-10-08 2016-05-17 Milwaukee Electric Tool Corporation Powered cutting tool
US9675011B2 (en) 2014-10-28 2017-06-13 Black & Decker Inc. Shearing tool

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424356C2 (de) * 1984-07-03 1986-05-07 Maschinenfabrik Otto Baier Gmbh, 7140 Ludwigsburg Sicherheitsvorrichtung, insbesondere für eine Schere
DE3446802C1 (de) * 1984-12-21 1986-04-24 Maschinenfabrik Otto Baier Gmbh, 7140 Ludwigsburg Sicherheitsvorrichtung, insbesondere für eine Schere
FR2580215B1 (fr) * 1985-04-15 1989-06-16 Black & Decker Inc Secateur a moteur
DE3524443A1 (de) * 1985-07-09 1987-01-15 Black & Decker Inc Elektrisch angetriebene astschere
FR2585612A1 (fr) * 1985-08-02 1987-02-06 Germain Pierre Secateur electrique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1465130A (en) * 1923-06-20 1923-08-14 Hernon Lon Automatic scissors
US1806555A (en) * 1931-05-19 gonsett
US1856092A (en) * 1930-04-18 1932-05-03 Gen Talking Pictures Corp Switching apparatus
US2600540A (en) * 1946-09-03 1952-06-17 Frank E King Power-operated disinfecting pruning shears
US2878333A (en) * 1955-07-25 1959-03-17 Gen Electric Controlled speed tap changing mechanism
US3155782A (en) * 1959-05-01 1964-11-03 Mc Graw Edison Co Switch actuating mechanism for controlled speed tap changer
US3178816A (en) * 1963-04-12 1965-04-20 Arvin E Schmid Power pruning shears

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806555A (en) * 1931-05-19 gonsett
US1465130A (en) * 1923-06-20 1923-08-14 Hernon Lon Automatic scissors
US1856092A (en) * 1930-04-18 1932-05-03 Gen Talking Pictures Corp Switching apparatus
US2600540A (en) * 1946-09-03 1952-06-17 Frank E King Power-operated disinfecting pruning shears
US2878333A (en) * 1955-07-25 1959-03-17 Gen Electric Controlled speed tap changing mechanism
US3155782A (en) * 1959-05-01 1964-11-03 Mc Graw Edison Co Switch actuating mechanism for controlled speed tap changer
US3178816A (en) * 1963-04-12 1965-04-20 Arvin E Schmid Power pruning shears

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536976A (en) * 1967-03-09 1970-10-27 Arthur Briskman Power-driven electronically controlled tool
US3787742A (en) * 1972-03-07 1974-01-22 Arvin Ind Inc Electric shears
US4173069A (en) * 1978-05-24 1979-11-06 Kett Tool Co. Power shear head
US4602431A (en) * 1985-01-31 1986-07-29 Keel Gayle M Haircutting shears
FR2584566A1 (fr) * 1985-07-15 1987-01-16 Delmas Daniel Secateur automatique pour la taille de la vigne, arbres et autres...
EP0209481A1 (de) * 1985-07-15 1987-01-21 Daniel Delmas Automatische Schere zum Schneiden von Reben, Bäumen und dergleichen
US5058276A (en) * 1990-04-16 1991-10-22 Parker William H Hedge trimmer
US5867909A (en) * 1996-04-27 1999-02-09 J. Wagner Gmbh Branch shears tool
US6044564A (en) * 1996-04-27 2000-04-04 J. Wagner Gmbh Branch cutter tool
US6226875B1 (en) * 2000-02-19 2001-05-08 Sheau Pyng Lii Grass shears
US20040118257A1 (en) * 2002-12-16 2004-06-24 Kratzmaier Konstructionen Gmbh Motor-driven cutting device
USD559052S1 (en) 2006-07-06 2008-01-08 Benard Voelker Battery-operable pruning device
EP1969919A1 (de) * 2007-03-14 2008-09-17 Robert Bosch Gmbh Schneidewerkzeuge
US9820445B2 (en) 2007-03-14 2017-11-21 Robert Bosch Gmbh Reciprocating cutting tool
EP2338325A1 (de) * 2007-03-14 2011-06-29 Robert Bosch GmbH Schneidewerkzeuge
US20090188361A1 (en) * 2007-03-14 2009-07-30 Peter Simpson Cutting tools
EP2158805A1 (de) * 2008-08-26 2010-03-03 Robert Bosch GmbH Gemüseschneidewerkzeug
US20100077621A1 (en) * 2008-08-26 2010-04-01 Andrew Quigley Vegetation cutting tool
US20110314680A1 (en) * 2009-03-06 2011-12-29 Positec Power Tools (Suzhou) Co., Ltd. Shearing Tool
US20110061242A1 (en) * 2009-09-15 2011-03-17 Chervon Limited Electric shears
US8434234B2 (en) * 2009-09-15 2013-05-07 Chervon Limited Electric shears
WO2012048286A2 (en) 2010-10-08 2012-04-12 Milwaukee Electric Tool Corporation Powered cutting tool
US9339938B2 (en) 2010-10-08 2016-05-17 Milwaukee Electric Tool Corporation Powered cutting tool
US9757868B2 (en) 2010-10-08 2017-09-12 Milwaukee Electric Tool Corporation Powered cutting tool
EP2625010A4 (de) * 2010-10-08 2014-03-19 Milwaukee Electric Tool Corp Stromgetriebenes schneidewerkzeug
US9675011B2 (en) 2014-10-28 2017-06-13 Black & Decker Inc. Shearing tool
US9980438B2 (en) 2014-10-28 2018-05-29 Black & Decker Inc. Shearing tool

Also Published As

Publication number Publication date
DE1553664A1 (de) 1972-01-05
DE1728467A1 (de) 1973-02-01
CH470939A (de) 1969-04-15
GB1154610A (en) 1969-06-11
FR1568870A (de) 1969-05-30

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