Reciprocating blades with sealing member for motion conversion mechanism

Patent metadata

Field	Value
Publication number	US-12364191-B2
Application number	US-202217954996-A
Country	US
Kind code	B2
Filing date	Sep 28, 2022
Priority date	Sep 29, 2021
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A working machine may include: a conversion mechanism configured to convert motion of a prime mover; a first blade connected to the conversion mechanism; a second blade overlapping with the first blade in an up-down direction and facing a first facing surface of the first blade; a sealing member engaged with a first non-facing surface of the first blade that is opposite to the first facing surface, wherein the sealing member includes a first sealing surface facing the first non-facing surface in the up-down direction; and a cover member facing a second sealing surface of the sealing member that is opposite to the first sealing surface of the sealing member. The sealing member may be disposed forward of the conversion mechanism and configured to suppress the object cut with the first blade and the second blade from moving toward the conversion mechanism between the first blade and the cover member.

First claim

What is claimed is:

1. A working machine comprising:
a prime mover;
a conversion mechanism configured to convert motion 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 facing a first facing surface of the first blade;
a sealing member in direct contact with a first non-facing surface of the first blade that is opposite to the first facing surface of the first blade, wherein the sealing member comprises a first sealing surface facing the first non-facing surface of the first blade in the up-down direction; and
a cover member facing a second sealing surface of the sealing member that is opposite to the first sealing surface of the sealing member,
wherein
the first blade comprises a first blade edge,
the second blade comprises a second blade edge,
the first blade is configured to reciprocate along a first direction with respect to the second blade by the motion of the prime mover,
the first blade edge of the first blade and the second blade edge of the second blade are configured to cut an object when the working machine moves forward along a front-rear direction, which is perpendicular to the up-down direction, with the first blade reciprocating with respect to the second blade,
the sealing member is disposed forward of the conversion mechanism and configured to suppress the object cut with the first blade edge of the first blade and the second blade edge of the second blade from moving toward the conversion mechanism between the first blade and the cover member,
the sealing member is configured to reciprocate together with the first blade along the first direction,
the cover member defines a mechanism chamber in which at least a part of the conversion mechanism is disposed,
the cover member comprises a discharge port communicating the mechanism chamber with a space outside of the working machine, and
an inlet of the discharge port is positioned to face the sealing member in the first direction.

2. The working machine according to claim 1 , wherein an outlet of the discharge port is positioned to face the inlet of the discharge port in the first direction.

3. The working machine according to claim 1 , wherein the cover member comprises a grease guard that is disposed rearward of the discharge port in the front-rear direction and configured to suppress movement of grease.

4. The working machine according to claim 1 , wherein
the cover member comprises a projecting wall that extends toward the first non-facing surface of the first blade and is disposed forward of the sealing member, and
the projecting wall overlaps with at least a part of the sealing member as the working machine is viewed in the front-rear direction.

5. The working machine according to claim 2 , wherein
the cover member comprises:
a grease guard that is disposed rearward of the discharge port in the front-rear direction and configured to suppress movement of a grease; and
a projecting wall that extends toward the first non-facing surface of the first blade and is disposed forward of the sealing member, and

the projecting wall overlaps with at least a part of the sealing member as the working machine is viewed in the front-rear direction.

Assignees

• Makita Corp

Inventors

• Oishi Kohei
• Kutsuna Tomoyuki
• Iio Takayoshi

Classifications

• A01D34/40

  Other details · CPC title

• A01D34/30

  Driving mechanisms for the cutters · CPC title

• A01D34/10 Primary

  with motor driven cutters or wheels · CPC title