FASTENING TOOL

• US 20200130047A1
• Filed: 06/08/2018
• Published: 04/30/2020
• Est. Priority Date: 06/19/2017
• Status: Active Grant

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: YABUNAKA, Toshihito, IKUTA, Hiroki, KUROYANAGI, Takao
• Granted Patent: US 11,161,168 B2
• Time in Patent Office: Days
• CPC Class Codes: B21J 15/043 by pulling a mandrel
• CPC Class Codes: B21J 15/105 Portable riveters pliers for riveting B21J15/386
• CPC Class Codes: B21J 15/26 operated by rotary drive, e.g. by electric motor
• CPC Class Codes: B21J 15/326 Broken-off mandrel collection

Abstract

A fastening tool includes a housing, a fastener-abutment part, a pin-gripping part, a motor, a driving mechanism and a handle. The housing extends in a front-rear direction along a driving axis. The driving mechanism is configured to move the pin-gripping part rearward along the driving axis relative to the fastener-abutment part. The driving mechanism includes a rotary member and a movable member configured to linearly move in the front-rear direction when the rotary member is rotationally driven. The handle protrudes downward from the housing and has a trigger. A rotation axis of a motor shaft extends in parallel to the driving axis on a lower side of the driving axis. A virtual plane including the driving axis and the rotation axis passes a center of the handle in a left-right direction. The trigger is disposed between the rotary member and a motor body in the front-rear direction.

Claims

1. A fastening tool configured to fasten a workpiece via a fastener, the fastener having a pin and a cylindrical part, the fastening tool comprising:

a housing extending in a front-rear direction of the fastening tool along a specified driving axis;

a fastener-abutment part held by a front end portion of the housing so as to be capable of abutting on the cylindrical part;

a pin-gripping part held to be movable in the front-rear direction along the driving axis relative to the fastener-abutment part and configured to grip a portion of the pin;

a motor housed in the housing and including a motor body and a motor shaft, the motor body including a stator and a rotor, the motor shaft extending from the rotor;

a driving mechanism at least partially housed in the housing, and configured to be driven by power of the motor and to move the pin-gripping part rearward along the driving axis relative to the fastener-abutment part to pull the pin gripped by the pin-gripping part and deform the cylindrical part abutting on the fastener-abutment part, thereby fastening the workpiece via the fastener; and

a handle protruding downward from the housing in an up-down direction orthogonal to the front-rear direction, the handle having a trigger provided in an upper end portion of the handle and configured to be depressed by a user, wherein;

the driving mechanism includes;

a rotary member supported by the housing so as to be rotatable around the driving axis while its movement in the front-rear direction is restricted, the rotary member being configured to be rotationally driven by the power of the motor; and

a movable member connected to the pin-gripping part and configured to be engaged with the rotary member so as to be movable in the front-rear direction along the driving axis while its rotation around the driving axis is restricted, and to linearly move in the front-rear direction when the rotary member is rotationally driven,

a rotation axis of the motor shaft extends in parallel to the driving axis on a lower side of the driving axis,

a virtual plane including the driving axis and the rotation axis passes a center of the handle in a left-right direction orthogonal to the front-rear direction and the up-down direction, and

the trigger is disposed between the rotary member and the motor body in the front-rear direction.

2. The fastening tool as defined in claim 1, wherein the rotary member and the motor body are spaced apart from each other in the front-rear direction.

3. The fastening tool as defined in claim 2, wherein the rotary member and the motor are arranged to partially overlap with each other when viewed from the rear.

4. The fastening tool as defined in claim 1, wherein:

the rotary member has a driven gear formed on its outer periphery,

the driving mechanism further includes an intermediate shaft configured to be rotationally driven along with rotation of the motor shaft and having a driving gear engaged with the driven gear, and

the intermediate shaft is arranged coaxially with the motor shaft.

5. The fastening tool as defined in claim 1, wherein:

the driving mechanism is configured to fasten the workpiece via the fastener and break the pin at a small-diameter part for breakage, and

the fastening tool further comprises;

a pintail passage extending in the front-rear direction along the driving axis and configured to allow passage of a pintail separated by breakage of the pin; and

a collection container for the pintail removably attached to a rear end portion of the housing and having an internal space communicating with a rear end of the pintail passage.

6. The fastening tool as defined in claim 5, wherein the collection container is configured such that the driving axis and the rotation axis of the motor shaft are located within a region occupied by the collection container when viewed from the rear.

7. The fastening tool as defined in claim 5, wherein:

the movable member is formed as a hollow member having the pintail passage,

the fastening tool further comprises a dustproof member held by the rear end portion of the housing and held in contact with an outer peripheral surface of a rear end portion of the movable member, and

the dustproof member is disposed such that the movable member moves in the front-rear direction with the outer peripheral surface in sliding contact with the dustproof member, thereby preventing dust from entering an area forward of the dustproof member.

8. The fastening tool as defined in claim 1, further comprising:

an illumination device disposed in a lower end portion of the housing and configured to irradiate light to a peripheral region of a front end portion of the fastener-abutment part; and

a trigger-protection part extending from the lower end portion of the housing to a front end portion of the handle, while securing a space for a user'"'"'s finger in front of the trigger,

wherein the trigger-protection part has a passage for wiring for the illumination device inside.

9. The fastening tool as defined in claim 1, wherein:

the housing includes a rotary-member-holding part supporting the rotary member, and

the fastening tool further comprises an elastic member disposed behind the rotary member and between the rotary member and the rotary-member-holding part.

10. The fastening tool as defined in claim 1, wherein:

the housing includes a rotary-member-holding part supporting the rotary member,

the fastening tool further comprises;

an intervening member disposed between the rotary member and the rotary-member-holding part in the front-rear direction; and

a position-detecting mechanism configured to detect that the pin-gripping part is located in a specified reference position,

the driving mechanism is configured to move the pin-gripping part forward along the driving axis relative to the fastener-abutment part to be placed in a specified initial position based on a detection result of the detection device after the workpiece is fastened, and

the intervening member is configured to abut on an abutment part of the movable member when the pin-gripping part connected to the movable member is moved forward beyond the initial position, thereby preventing the movable member and the pin-gripping part from further moving forward.