US3676928A - Electric scissors - Google Patents

Electric scissors Download PDF

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Publication number
US3676928A
US3676928A US51466A US3676928DA US3676928A US 3676928 A US3676928 A US 3676928A US 51466 A US51466 A US 51466A US 3676928D A US3676928D A US 3676928DA US 3676928 A US3676928 A US 3676928A
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US
United States
Prior art keywords
blade
housing
ledger
motor
ledger blade
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
US51466A
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English (en)
Inventor
John A Herr
Oswald M Porter
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Application granted granted Critical
Publication of US3676928A publication Critical patent/US3676928A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • a first embodiment biases the ledger blade in a normally UNITED STATES PATENTS fixed position by a torsion spring which may be compressed to effect a snip by pushing the ledger blade against a table-like 1,587,718 6/1926 Gent le ..3o/247 Surfacg
  • the other mbodiment disclose a lever mangemem 1,656,626 1/1928 Ghana whereby the ledger blade is pivoted to effect a snip by 1,818,900 8/1931 MacNamee" manually squeezing a lever-link against the force of a spring. 2,709,300 5/1955 Bl0mberg together
  • Portable electric scissors of the prior art have a major disadvantage in that there is a general lack of control when cutting sharp angles and small contours.
  • a vibratory motor for normally oscillating the cutting blade.
  • the present invention therefore, provides an electric scissors in which the ledger blade is fixedly mounted relative to the motor driven cutting blade and the scissors housing during normal cutting operations, but may be moved selectively to effect a controlled snip.
  • the ledger blade is directly connected to a spring which biases the ledger blade about a pin into a fixed position during normal cutting operation.
  • the ledger blade is forced against a tablelike surface as the scissors housing is turned relative thereto.
  • the ledger blade is resiliently biased about a pin into a fixed position during normal cutting by a pair of lever-links and a spring acting against one of the links. When a snip is desired the operator merely squeezes one of the lever-links to compress the spring and force the other link to pivot the ledger blade into engagement with the motor driven cutting blade.
  • a primary object of the present invention to provide a power driven hand held scissors having a ledger blade mounted so as to be fixed during the normal cutting operations, but which is selectively movable to effect a controlled snip.
  • Another object of this invention is to provide an electric scissors having a cutting blade adapted to oscillate into engagement with a nonnally fixed ledger blade, and having means for permitting the ledger blade to be moved into cutting engagement with the cutting blade to effect a snip.
  • a further object of this invention is to provide an electric scissors having a rotary motor and having the capability of selectively effecting a controlled snip.
  • a still further object of this invention is to provide an electrically powered scissors in which the ledger blade may be moved selectively to effect a cut along substantially the entire cutting surface of the driven blade.
  • FIG. 1 is an elevational view of an electric scissors incorporating a first embodiment of our invention, with parts of said scissors broken away and in cross section, and with the ledger blade illustrated by solid lines in its normally fixed position and by broken lines in the full snip position;
  • FIG. 2 is a perspective view partially broken away of the drive incorporated in the scissors of FIG. 1;
  • FIG. 3 is an elevational view of an electric scissors incorporating a second embodiment of our invention, with parts thereof partially broken away and in cross section, and with the ledger blade shown by solid lines in its normally fixed position and with broken lines illustrating the full snip position.
  • FIG. 1 an electric scissors incorporating a first embodiment of our invention is illustrated in FIG. 1 and is generally indicated as 10.
  • the scissors unit includes a housing 12 preferably comprising two molded sections secured together by means of screws (not shown).
  • an electric motor 14 preferably of the rotary type having a rotatable output shaft 16.
  • a cutting blade 18 is pivotably mounted in the housing on a pin or axle 20.
  • the blade 18 is driven from the output shaft 16 of the motor 14 by any drive means capable of converting rotary motion to pivotal oscillatory motion.
  • a drive having this capability is generally indicated as 22 and is clearly illustrated in FIG. 2 as comprising a crank 24 having an eccentrically mounted crank pin 26.
  • a yoke member 30 Secured to the tail end 28 of the blade 18 is a yoke member 30 having a pair of legs 32 and 34 between which is mounted a block member 36 having a slot substantially parallel to the pin 20.
  • a pair of pins 40 mount the block 36 between the legs 32 and 34 to allow for limited pivotal movement of the block.
  • the crank pin drives the yoke 30 and blade 18 through the block 36 pivotally about the pin 20.
  • the slot 38 effectively restrains the motion of the yoke 30 to a single plane substantially normal to the pin 20.
  • the blade 18 operates against a ledger blade 42 by pivotably oscillating into and out of cooperative cutting engagement therewith.
  • the cut it should be noted, occurs along a very small portion of the blades, since the oscillation of blade 18 is small.
  • the ledger blade is pivotably mounted on the pin 20 along with the blade 18.
  • the ledger blade is biased to a normally fixed position about the pin 20 in a direction that tends to separate the two blades, i.e., counterclockwise as viewed in FIG. 1, by a torsion spring 44.
  • a stop 45 maybe utilized to prevent further counterclockwise movement of the blade 42 during normal cutting so that the spring need not be of excessive size.
  • the spring 44 is mounted upon a boss 46 which may form a portion of the means for securing the molded housing sections together.
  • One end of the spring 44 is located to abut against a stop member 48 while the other end thereof is bent to securely fit a hole 50 in the blade 42.
  • the location of the hole 50 is such that the torque of the spring creates a bending moment on the blade 42 relative to the pin 20 so that the blade 42 is biased away from the blade 18, and cannot move unless and until the spring 44 is compressed.
  • the operator When it is desired to effect a snip cut with the scissors disclosed in FIG. 1, the operator merely forces the ledger blade 42 against a table-like surface and rolls the housing 12 relative to that blade to create a bending moment on the blade that overcomes that due to the spring. This compresses the spring to the dotted position shown in FIG. 1 and the ledger blade may be moved to contact a portion of or the entire blade 18 to effect a snip with the blade 42 up until its tip 52.
  • FIG. 1 requires a surface against which the ledger blade must be forced to effect a snip. It is often desirable to have a scissors of this type in which a snip may be performed without the aid of such a surface.
  • the embodiment of FIG. 3 discloses an electric scissors 1 10 having this capability.
  • Mounted within a housing 112 is a rotary type motor 114 having an output shaft 116.
  • a cutting blade 118 is pivoted on a pin 120 in the housing and is pivotably oscillated from the shaft 116 by a crank 124 mounted on the shaft and which includes a crank pin 126 which oscillates the blade 118 through a yoke member 130 secured to the tail 128 of the blade 1 18.
  • This drive is similar to that described in connection with the embodiment of FIG. 1 and is detailed in FIG. 2.
  • the blade 118 operates against a ledger blade 142 to effect a cut along a small portion of the blade.
  • the ledger blade 142 is pivoted on the pin 120 and is biased to a normally fixed position, as shown by the solid lines, by means of a resiliently mounted lever arrangement, presently described.
  • a link 131 Pivotably mounted on a pin 129 in the housing is a link 131 having an open slot 133 at one end thereof and a pin 135 adjacent the other end thereof.
  • the pin 137 is fitted within the slot 133 to restrain the blade 142 against movement independently of the link 131.
  • a second link 141 is pivotably mounted at the rear of the housing by means of a pin 143, and is adapted to engage the pin 135.
  • a leaf spring 144 acts on the link 131 to bias the ledger blade 142 away from the oscillatable blade 118 and toward a stop member 145 similar to that of stop 45.
  • the spring and lever arrangement is such that the ledger blade is biased counterclockwise about pin 120 and remain as shown by the solid lines until the force of the spring is overcome. This is the position of the ledger blade during the normal cutting operation.
  • the operator merely squeezes the link lever 141.
  • the pin 135 on link 131 thereby causes this link to pivot about pin 129 and compress the spring 144.
  • the slot 133 of link 131 thereby applies a force against pin 137 on the ledger blade to pivot the blade clockwise to effect a snip, as shown by the broken lines in FIG. 3.
  • the snip may be a full contact between the ledger blade and the cutting blade or may be a portion thereof which is larger than the contact made between the blades during the normal cutting operation.
  • An electric scissors comprising a housing, a motor mounted in said housing, a normally fixed ledger blade, mounting means including pivot means for pivotably mounting said ledger blade to said housing, a second blade supported in said housing and adapted to be oscillated by said motor,
  • said drive means connecting said motor and said second blade for oscillating said second blade into and out of cooperative cutting engagement with said normally fixed ledger blade along a first contact area of said blades, said mounting means further including resilient means for selectively permitting the normally fixed ledger blade to be pivoted manually from the normally fixed position toward and into cutting engagement with said second blade along a second contact area of said blades to effect a snip, said second area being greater than said first area.
  • said resilient means comprises a torsion spring having one end thereof secured to said ledger blade at a location with respect to said pivot means such that when said ledger blade is selectively relatively pivoted about said pivot means into cutting engagement with said second blade to effect a snip said spring is compressed from a normal into an energystored condition
  • An electric scissors comprising a housing, a motor mounted in said housing, a normally fixed ledger blade mounted in said housing, a second blade supported in said housing and adapted to be oscillated by said motor, drive means connecting said motor and said second blade for oscillating said second blade into and out of cooperative cutting engagement with said normally fixed ledger blade, pivot means for supporting said ledger blade in said housing, lever means connected to said ledger blade and pivotably secured to said housing, and a spring in engagement with said lever means for biasing the same, said lever means being connected to said ledger blade at a location with respect to said pivot means such that said ledger blade is biased away from said second blade about said pivot means, said lever means being adapted to be manually selectively pivoted relative to said housing to overcome the bias of said spring for pivoting said ledger blade into cutting engagement with said second blade to effect a snip.
  • lever means comprises a first link, a pin pivotably mounting said first link in said housing, a second link having first and second extremities, said second link being pivotably mounted intermediate said extremities in said housing, means connecting said first extremity to said first link for pivotally moving said second link relative to said housing upon pivotal movement of said first link, and means for connecting said second extremity to said ledger blade.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)
US51466A 1970-07-01 1970-07-01 Electric scissors Expired - Lifetime US3676928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5146670A 1970-07-01 1970-07-01

Publications (1)

Publication Number Publication Date
US3676928A true US3676928A (en) 1972-07-18

Family

ID=21971470

Family Applications (1)

Application Number Title Priority Date Filing Date
US51466A Expired - Lifetime US3676928A (en) 1970-07-01 1970-07-01 Electric scissors

Country Status (5)

Country Link
US (1) US3676928A (enExample)
CA (1) CA939132A (enExample)
DE (2) DE7119828U (enExample)
FR (1) FR2098130A1 (enExample)
GB (1) GB1331858A (enExample)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD292167S (en) 1985-04-17 1987-10-06 Black & Decker Inc. Cordless electric pruner
USD307232S (en) 1987-11-04 1990-04-17 Makita Electric Works, Ltd. Cordless electric pruner
US5353504A (en) * 1993-04-30 1994-10-11 Pai Chung Jen Motorized scissors
USD487386S1 (en) 2001-08-17 2004-03-09 Gardena Manufacturing Gmbh Cutting head
USD512623S1 (en) * 2004-01-26 2005-12-13 Hsin-Te Huang Metal shears
US20070017103A1 (en) * 2005-07-20 2007-01-25 Black & Decker Inc. Table mount holder for battery powered scissors
US20070144017A1 (en) * 2002-09-19 2007-06-28 George Miller Cast-cutter
USD555453S1 (en) * 2006-05-24 2007-11-20 Black & Decker Inc. Cutting head
USD555452S1 (en) * 2006-05-24 2007-11-20 Black & Decker Inc. Cutting head
USD555999S1 (en) * 2006-10-31 2007-11-27 Huo-Mu Lai Pair of power-operated scissors
USD633765S1 (en) * 2009-09-18 2011-03-08 Max Co., Ltd. Electric scissors
US20230137643A1 (en) * 2020-03-02 2023-05-04 Innovation Fabrication Commercialisation Infaco Shears with a mechanical end stop

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ208927A (en) * 1983-07-26 1987-04-30 Kazimir Stolfa Power driven sheet metal shears; blade configuration allows cutting of left and right curves
DE3670970D1 (de) * 1985-10-31 1990-06-13 Andreas Weber Schneidvorrichtung fuer wand- und bodenbelaege.
DE3608147A1 (de) * 1986-03-12 1987-09-17 Andreas Weber Schneidvorrichtung fuer wand- und bodenbelaege
IT212378Z2 (it) * 1987-10-08 1989-07-04 Va Ri Me S R L Cesoia motorizzata autoalimentata utilizzabile in particolare per la potatura di piante

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1587718A (en) * 1924-07-03 1926-06-08 Gentile Pasquale Automatic scissors
US1656626A (en) * 1926-10-28 1928-01-17 Nichitu V Ghetia Hair clipper
US1818900A (en) * 1930-02-18 1931-08-11 Joseph B Macnamee Automatic scissors or shears
US2709300A (en) * 1952-07-14 1955-05-31 Eric W Blomberg Shearing attachment for portable motor tool
US2799928A (en) * 1956-10-03 1957-07-23 Artrice A Mays Electrically operated scissors or shears

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1587718A (en) * 1924-07-03 1926-06-08 Gentile Pasquale Automatic scissors
US1656626A (en) * 1926-10-28 1928-01-17 Nichitu V Ghetia Hair clipper
US1818900A (en) * 1930-02-18 1931-08-11 Joseph B Macnamee Automatic scissors or shears
US2709300A (en) * 1952-07-14 1955-05-31 Eric W Blomberg Shearing attachment for portable motor tool
US2799928A (en) * 1956-10-03 1957-07-23 Artrice A Mays Electrically operated scissors or shears

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD292167S (en) 1985-04-17 1987-10-06 Black & Decker Inc. Cordless electric pruner
USD307232S (en) 1987-11-04 1990-04-17 Makita Electric Works, Ltd. Cordless electric pruner
US5353504A (en) * 1993-04-30 1994-10-11 Pai Chung Jen Motorized scissors
USD487386S1 (en) 2001-08-17 2004-03-09 Gardena Manufacturing Gmbh Cutting head
US20070144017A1 (en) * 2002-09-19 2007-06-28 George Miller Cast-cutter
US8069757B2 (en) * 2002-09-19 2011-12-06 David J. Ross Cast-cutter
USD512623S1 (en) * 2004-01-26 2005-12-13 Hsin-Te Huang Metal shears
US20070017103A1 (en) * 2005-07-20 2007-01-25 Black & Decker Inc. Table mount holder for battery powered scissors
USD555453S1 (en) * 2006-05-24 2007-11-20 Black & Decker Inc. Cutting head
USD555452S1 (en) * 2006-05-24 2007-11-20 Black & Decker Inc. Cutting head
USD555999S1 (en) * 2006-10-31 2007-11-27 Huo-Mu Lai Pair of power-operated scissors
USD633765S1 (en) * 2009-09-18 2011-03-08 Max Co., Ltd. Electric scissors
US20230137643A1 (en) * 2020-03-02 2023-05-04 Innovation Fabrication Commercialisation Infaco Shears with a mechanical end stop

Also Published As

Publication number Publication date
DE7119828U (de) 1971-09-02
DE2130043A1 (de) 1972-01-05
GB1331858A (en) 1973-09-26
CA939132A (en) 1974-01-01
FR2098130A1 (enExample) 1972-03-03

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