Hand-held cutter

Patent metadata

Field	Value
Publication number	US-10427263-B2
Application number	US-201815946721-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Apr 6, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

The hand-held cutter includes: a cutting blade which is configured to rotate about a rotation shaft to cut a target; a cutter body which rotatably supports the cutting blade; a protection cover which covers a portion of the cutting blade and is rotatable about the rotation shaft; a pressing mechanism which is configured to move toward the protection cover to press a guide plate onto a support plate so as to impose and maintain restrictions on rotation of the protection cover; and a torsion coil spring exerting a biasing force to move the pressing mechanism toward the protection cover. The hand-held cutter is configured such that moving the pressing mechanism, against the biasing force of the torsion coil spring, away from the protection cover removes restrictions on the rotation of the protection cover.

First claim

What is claimed is:

1. A hand-held cutter comprising:
a disc-shaped cutting blade which is configured to rotate about a rotation shaft to cut a target;
a cutter body which rotatably supports the cutting blade;
a protection cover which is rotatable about the rotation shaft and covers a portion of the cutting blade; and
a pressing mechanism which is movable in parallel to the rotation shaft, and when positioned close to one side of the hand-held cutter, imposes and maintains restrictions on rotation of the protection cover by pressing the protection cover onto the cutter body or the cutter body onto the protection cover; wherein:
the pressing mechanism includes a biasing member which is configured to exert a biasing force to move the pressing mechanism toward the one side of the hand-held cutter;
the hand-held cutter is configured such that moving the pressing mechanism, against the biasing force of the biasing member, toward a side opposite to the one side of the hand-held cutter removes the restrictions on the rotation of the protection cover;
the pressing mechanism is movable in parallel to the rotation shaft by screwing movements;
the pressing mechanism includes a rod member of which one end is provided with a screwable portion and the other end thereof is fixed to a manipulation handle manipulatable by an operator,
the hand-held cutter further comprises a nut that includes a screw receiving portion which extends in parallel to the rotation shaft, and in which the screwable portion can be screwed toward and away from the cutter body, and
the biasing member has one end fixed to a support plate and the other end thereof fixed to the manipulation handle, and exerts the biasing force in a torsional direction in which the screwable portion is screwed toward the cutter body to cause the rod member to move toward the one side of the hand-held cutter.

2. The hand-held cutter of claim 1 , wherein
the biasing member is configured as a torsion coil spring mounted around the rod member.

3. The hand-held cutter of claim 2 , wherein
the hand-held cutter further comprises a guide plate attached on an outer surface of a sidewall of the protection cover,
the guide plate has an arch-shaped slit extending around the rotation shaft, and
the rod member passes through the slit, is movable in parallel to the rotation shaft, and is configured to move relative to the slit as the protection cover rotates.

4. The hand-held cutter of claim 1 , wherein
the manipulation handle extends in a direction perpendicular to the rotation shaft, is in a shape of a lever, and has one end fixed to the other end of the rod member, and the other end of the manipulation handle configured as a manipulation portion manipulatable by the operator.

5. The hand-held cutter of claim 4 , wherein
the cutter body is provided with a grip frame by which the operator can raise the cutter body,
the manipulation handle is located near the grip frame,
the manipulation portion is positioned above the rod member, and
turning the manipulation handle so as to bring the manipulation portion closer to the grip frame causes the rod member is screwed away from the cutter body.

6. The hand-held cutter of claim 1 , wherein
the rod member includes a shaft and a mounting plate,
the shaft has one end provided with the screwable portion, and the other end provided with a fitting portion having a shape of a regular polygon as viewed along the rotation shaft,
the mounting plate has a fitting hole which can be externally fitted on the fitting portion, and an engagement projection which projects from an outer periphery of the mounting plate and can engage with the manipulation handle,
a wall defining the fitting hole has a plurality of fitting recesses which each have a triangular shape as viewed in a direction in which the fitting hole penetrates the mounting plate and which are arranged regularly in a circumferential direction,
corners of the fitting portion can engage with the plurality of fitting recesses, and
the plurality of fitting recesses are arranged asymmetrically with respect to a line connecting a center of the engagement projection and a center of the fitting hole, as viewed in the direction in which the fitting hole penetrates the mounting plate.

Assignees

• Yamabiko Corp

Inventors

• Nakaganna Hiroshi

Classifications

• B28D1/04

  with circular {or cylindrical} saw-blades or saw-discs (B28D1/10 takes precedence) · CPC title

• B23Q11/08 Primary

  Protective coverings for parts of machine tools; Splash guards · CPC title

• B23Q11/06

  Safety devices for circular cutters · CPC title

• B27G19/04

  for manually-operated power-driven circular saws · CPC title

• B23D45/16 Primary

  Hand-held sawing devices with circular saw blades · CPC title