Hand-held tool

Patent metadata

Field	Value
Publication number	US-11964356-B2
Application number	US-201916981247-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Apr 5, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A hand-held tool, such as a disc grinder, is used to perform work at a high work site, a countermeasure is taken to prevent the hand-held tool from falling by using a suspension tool, such as a tether strap. If a coupling part that couples the suspension tool to the hand-held tool is damaged, this fact is notified to a user. Thereby, an original function of the suspension tool can be reliably performed. If a large impact is applied to a coupling member via a suspension tool, the coupling member is displaced to a second position, due to the deformation of a first position retaining member. A conductive portion disengages from contacts to cause a power circuit to be shut off, thereby prohibiting a main body part from being activated.

First claim

What is claimed is:

1. A hand-held tool that is held by a hand of a user to operate, comprising:
a main body housing a motor; and
a coupling part that couples to a suspension tool, wherein:
the coupling part includes a coupling member that is displaceably supported relative to the main body of the hand-held tool between a first position and a second position without separating from the main body, and a first position retaining member that holds the coupling member at the first position;
the coupling member is configured to translate along a longitudinal direction of the main body from the first position toward the second position; and
the coupling member is displaced to the second position due to plastic deformation of the first position retaining member, thereby preventing the motor from being activated and prohibiting the hand-held tool from being activated.

2. The hand-held tool according to claim 1 , wherein a shut off of a power circuit causes the hand-held tool to be prohibited from activation.

3. The hand-held tool according to claim 1 , wherein when the coupling member is displaced to the second position, a switch lever is prohibited from an ON operation, thereby prohibiting the hand-held tool from activation.

4. The hand-held tool according to claim 1 , wherein the plastic deformation prohibits the coupling member from returning to the first position after the coupling member has been displaced to the second position.

5. The hand-held tool according to claim 1 , wherein the first position retaining member holds the coupling member at the first position by biasing the coupling member to the first position.

6. A hand-held tool, comprising:
a main body housing a motor;
a coupling part comprising a coupling member displaceably supported relative to the main body between a first position and a second position without separating from the main body, the coupling part configured to couple to a suspension tool; and
a first position retaining member configured to bias the coupling member towards the first position;
wherein the coupling member is configured to translate along a longitudinal direction of the main body from the first position toward the second position;
wherein when the coupling member is in the second position, the first position retaining member is configured to prevent the coupling member from being displaced to the first position; and
wherein the translation of the coupling member from the first position to the second position and the coupling member being in the second position prevent the motor from being activated.

7. The hand-held tool according to claim 6 , wherein the coupling member is positioned further from the motor in the second position than in the first position.

8. The hand-held tool according to claim 1 , further comprising:
an informing means configured to visually notify the user that the coupling part has been deformed.

9. The hand-held tool according to claim 8 , wherein the informing means is positioned in the coupling part.

Assignees

• Makita Corp

Inventors

• Otani Ryosuke
• Ishikawa Junya
• Kotsuji Takafumi
• Ninagawa Satoshi
• Goto Ken
• Eto Yu

Classifications

• B24B23/02 Primary

  with rotating grinding tools; Accessories therefor · CPC title

• B25F5/02 Primary

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title