Electric scissors

• US 9,832,936 B2
• Filed: 05/16/2013
• Issued: 12/05/2017
• Est. Priority Date: 01/30/2009
• Status: Active Grant

• Current Assignee: Max Co Limited (., Max)
• Original Assignee: Max Co Limited (., Max)
• Inventors: Ishiguro, Hiroki
• Primary Examiner(s): Peterson, Kenneth E.
• Assistant Examiner(s): DAVIES, SAMUEL ALLEN
• Application Number:
  US13/896,143
• Publication Number:
  US 20130247384A1
• Time in Patent Office: 1,664 Days
• Field of Search: 30228, 30251, 30249
• CPC Class Codes: A01G 3/037 the driving means being an electric motor
• CPC Class Codes: A01G 3/08 Other tools for pruning, branching or delimbing standing trees
• CPC Class Codes: B26B 15/00 Hand-held shears with motor-driven blades

Abstract

Electric scissors (1A, 1B) is provided with: a first blade (2A, 2B); a second blade (3A, 3B); a toggle link mechanism (7A, 7B) including a first link (71A, 71B), a second link (72A, 72B), and a drive shaft (70A, 70B); and a drive section (5, 6). One end of the first link (71A, 71B) is rotatably connected to a transmission portion (21A, 21B) of the first blade (2A, 2B). One end of the second link (72A, 72B) is rotatably connected to a transmission portion (31A, 31B) of the second blade (3A, 3B). The other end of the first link (71A, 71B) is rotatably connected to the other end of the second link (72A, 72B) through the drive shaft (70A, 70B). The drive section (5, 6) is configured to open/close the first blade (2A, 2B) and the second blade (3A, 3B) by displacing the drive shaft (70A, 70B) in a direction perpendicular to an axial direction of the drive shaft (70A, 70B).

Claims

1. Electric scissors comprising:

a first blade including a first cutting edge portion and a first transmission portion, and rotatably supported by a fulcrum shaft serving as a fulcrum;

wherein the first cutting edge portion is disposed on one side of the first blade with respect to a position in which the first blade is supported by the fulcrum shaft,

the first transmission portion is disposed on the other side of the first blade with respect to the position, and

an angle between the first cutting edge portion and the first transmission portion is a predetermined obtuse angle;

a second blade including a second cutting edge portion and a second transmission portion,

wherein the second cutting edge portion is disposed on one side of the second blade with respect to a position in which the second blade is fixed relative to the fulcrum shaft, and

the second transmission portion is disposed on the other side of the second blade with respect to the position;

a drive section including a nut portion configured to linearly move a transmission member, wherein one side of the transmission member is rotatably connected to a guide shaft provided in the nut portion;

a first link, wherein the first link is a separate member from the transmission member, one end portion of the first link is rotatably connected to the other end portion of the transmission member via a drive shaft, and the other end portion of the first link is rotatably connected to the first transmission portion via a first transmission shaft serving as a first transmission fulcrum for the first transmission portion; and

a second link, wherein the second link is a separate member from the transmission member, one end portion of the second link is rotatably connected to the other end portion of the transmission member via the drive shaft, and the other end portion of the second link is rotatably connected to the second transmission portion via a second transmission shaft serving as a second transmission fulcrum for the second transmission portion,

wherein the first cutting edge portion is configured to be closed relative to the second cutting edge portion by rotating, around the fulcrum shaft, in a direction in which an angle between the first transmission portion and the second transmission portion increases, and the first cutting edge portion is configured to be opened relative to the second cutting edge portion by rotating, around the fulcrum shaft, in the direction in which the angle between the first transmission portion and the second transmission portion decreases,

wherein the drive section includes a motor to be rotatably driven and a ball screw mechanism configured to convert a rotation of the motor into a linear motion and to transmit the linear motion to the drive shaft, the ball screw mechanism including a screw shaft and the nut portion configured to linearly move along the screw shaft by rotating the screw shaft, the drive shaft being connected to the nut portion via the transmission member,

wherein the fulcrum shaft is disposed on a longitudinal axis with the screw shaft in a longitudinal direction,

wherein the screw shaft and the nut portion are disposed on an opposite side of the drive shaft, which is connected to the other end portion of the transmission member, from the first link and the second link in the longitudinal direction at all times, and

wherein rotation of the transmission member around the guide shaft moves the drive shaft so as to be off of the longitudinal axis of the screw shaft of the ball screw mechanism when the first blade and the second blade are closed to a maximum extent.

2. The electric scissors according to claim 1, wherein said angle between the first link and the second link becomes close to 180 degrees, when the first blade and the second blade are closed to a maximum extent.