Working machine and blade unit

Patent metadata

Field	Value
Publication number	US-12426535-B2
Application number	US-202318178581-A
Country	US
Kind code	B2
Filing date	Mar 6, 2023
Priority date	Mar 10, 2022
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A working machine may include: a first blade; a second blade overlapping with the first blade in an up-down direction; and a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction. The first blade may be configured to reciprocate in a direction perpendicular to the up-down direction with respect to the second blade. The first blade may include a first elongated hole having a longitudinal direction along the reciprocating direction. The second blade may include a second elongated hole having a longitudinal direction along the reciprocating direction. The holding unit may include: a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part.

First claim

What is claimed is:

1. A working machine comprising:
a prime mover;
a conversion mechanism configured to move in response to rotation of the prime mover;
a first blade connected to the conversion mechanism;
a second blade overlapping with the first blade in an up-down direction; and
a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction,
wherein
the first blade is configured to reciprocate in a reciprocating direction perpendicular to the up-down direction with respect to the second blade when the conversion mechanism moves,
the first blade includes a first elongated hole having a longitudinal direction along the reciprocating direction,
the second blade includes a second elongated hole having a longitudinal direction along the reciprocating direction,
the holding unit comprises:
a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and
an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part,

the holding part comprises an inner sleeve inserted in the outer sleeve, an outer circumference surface of the inner sleeve having a circular shape in cross-section, and
a length of the outer sleeve in the up-down direction is shorter than a length of the inner sleeve in the up-down direction.

2. The working machine according to claim 1 , wherein the outer sleeve is disposed in the first elongated hole and the second elongated hole.

3. The working machine according to claim 1 , wherein
the holding part further comprises:
a bolt comprising a head and supporting the inner sleeve;
a nut screwed to the bolt; and
a washer in which the bolt is inserted, the washer being disposed between the inner sleeve and the head, and

the inner sleeve, the bolt, the nut, and the washer hold the first blade and the second blade overlapping each other in the up-down direction.

4. The working machine according to claim 3 , wherein the inner sleeve and the bolt are separate components.

5. The working machine according to claim 1 , wherein hardness of the outer sleeve is different from hardness of the inner sleeve.

6. The working machine according to claim 1 , wherein a material of the outer sleeve is different from a material of the inner sleeve.

7. A working machine, comprising:
a prime mover;
a conversion mechanism configured to move in response to rotation of the prime mover;
a first blade connected to the conversion mechanism;
a second blade overlapping with the first blade in an up-down direction; and
a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction,
wherein
the first blade is configured to reciprocate in a reciprocating direction perpendicular to the up-down direction with respect to the second blade when the conversion mechanism moves,
the first blade includes a first elongated hole having a longitudinal direction along the reciprocating direction,
the second blade includes a second elongated hole having a longitudinal direction along the reciprocating direction,
the holding unit comprises:
a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and
an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part,

wherein
the first elongated hole of the first blade comprises a plurality of first elongated holes arranged along the reciprocating direction,
the second elongated hole of the second blade comprises a plurality of second elongated holes arranged along the reciprocating direction,
the plurality of first elongated holes comprises a first one-end elongated hole disposed at one end of the plurality of first elongated holes in the reciprocating direction,
the plurality of second elongated holes comprises a second one-end elongated hole disposed at one end of the plurality of second elongated holes in the reciprocating direction, the second one-end elongated hole overlapping with the first one-end elongated hole in the up-down direction, and
the holding part is inserted in the first one-end elongated hole and the second one-end elongated hole.

8. The working machine according to claim 7 , wherein
the holding unit comprises a plurality of holding units,
the plurality of first elongated holes further comprises a first other-end elongated hole disposed at other end of the plurality of first elongated holes in the reciprocating direction,
the plurality of second elongated holes further comprises a second other-end elongated hole disposed at other end of the plurality of second elongated holes in the reciprocating direction, the second other-end elongated hole overlapping with the first other-end elongated hole in the up-down direction,
the holding part of a holding unit of the plurality of holding units is inserted in the first one-end elongated hole and the second one-end elongated hole, and
the holding part of another holding unit of the plurality of holding units is inserted in the first other-end elongated hole and the second other-end elongated hole.

9. The working machine according to claim 2 , wherein
the holding part further comprises:
a bolt comprising a head and supporting the inner sleeve;
a nut screwed to the bolt; and
a washer in which the bolt is inserted, the washer being disposed between the inner sleeve and the head,

the inner sleeve, the bolt, the nut, and the washer hold the first blade and the second blade overlapping each other in the up-down direction,
the inner sleeve and the bolt are separate components,
hardness of the outer sleeve is different from hardness of the inner sleeve,
a material of the outer sleeve is different from a material of the inner sleeve,
the first elongated hole of the first blade comprises a plurality of first elongated holes arranged along the reciprocating direction,
the second elongated hole of the second blade comprises a plurality of second elongated holes arranged along the reciprocating direction,
the plurality of first elongated holes comprises a first one-end elongated hole disposed at one end of the plurality of first elongated holes in the reciprocating direction,
the plurality of second elongated holes comprises a second one-end elongated hole disposed at one end of the plurality of second elongated holes in the reciprocating direction, the second one-end elongated hole overlapping with the first one-end elongated hole in the up-down direction,
the holding part is inserted in the first one-end elongated hole and the second one-end elongated hole,
the holding unit comprises a plurality of holding units,
the plurality of first elongated holes further comprises a first other-end elongated hole disposed at other end of the plurality of first elongated holes in the reciprocating direction,
the plurality of second elongated holes further comprises a second other-end elongated hole disposed at other end of the plurality of second elongated holes in the reciprocating direction, and the second other-end elongated hole overlapping with the first other-end elongated hole in the up-down direction,
the holding part of a holding unit of the plurality of holding units is inserted in the first one-end elongated hole and the second one-end elongated hole, and
the holding part of another holding unit of the plurality of holding units is inserted in the first other-end elongated hole and the second other-end elongated hole.

10. A blade unit to which a motion of a prime mover is transmitted via

Assignees

• Makita Corp

Inventors

• Oishi Kohei
• Iio Takayoshi
• Kutsuna Tomoyuki
• Takahashi Satoshi

Classifications

• A01D34/145

  Devices for connecting the knife-bars to the driving mechanism · CPC title

• A01D34/37

  electric · CPC title

• A01G3/053

  motor-driven · CPC title

• A01D34/10 Primary

  with motor driven cutters or wheels · CPC title

• A01G3/067

  Motor-driven shears for lawns · CPC title