Driver, striking mechanism, and moving mechanism

Patent metadata

Field	Value
Publication number	US-11858101-B2
Application number	US-202217980980-A
Country	US
Kind code	B2
Filing date	Nov 4, 2022
Priority date	Apr 26, 2017
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A driver capable of suppressing increase in a load torque of a motor when a striking mechanism is moved by the torque of the motor against a force of a first moving mechanism is provided. The driver includes a striking mechanism 12 movable in a first direction B 1 and a second direction B 2 opposite to the first direction B 1 and a first moving mechanism configured to move the striking mechanism 12 in the first direction B 1 to strike a fastener, and the driver further includes a motor, a second moving mechanism 45 rotated by the torque of the motor and configured to move the striking mechanism 12 in the second direction against a force of the first moving mechanism, and torque suppression mechanisms 45 A to 45 H configured to suppress increase in the torque of the motor when the striking mechanism 12 is moved in the second direction B 2.

First claim

The invention claimed is:

1. A driver comprising:
a striking mechanism operable to move in a first direction and a second direction opposite to the first direction;
a first moving mechanism configured to move the striking mechanism in the first direction to strike a fastener;
a motor; and
a second moving mechanism configured to move the striking mechanism in the second direction against a force of the first moving mechanism,
wherein the striking mechanism includes:
a main body portion extending in the first direction; and
first engaging portions disposed on the main body portion, and spaced apart from each other in the first direction,

wherein the second moving mechanism includes:
a rotational element rotated by the motor, the rotational element including a drive shaft extending in a third direction crossing the first and second directions, and a first support and a second support spaced apart from each other in the third direction; and
second engaging portions disposed between the first support and the second support and spaced apart from each other in a rotation direction of the rotational element, the second engaging portions being engaged with and released from the first engaging portions, respectively, each second engaging portion having a pin shape,

wherein the first engaging portions protruding from the main body portion in a direction intersecting with the first and second directions,
wherein the first engaging portions include a first-first engaging portion having a first protrusion amount from a center line of the main body portion and a second-first engaging portion having a second protruding amount from the center line of the main body portion, the second protruding amount being greater than the first protrusion amount, the center line of the main body portion being parallel with the first direction, and
wherein the first-first engaging portion and the second-first engaging portion are arranged in that order in the first direction.

2. The driver according to claim 1 , wherein among the first engagement portions, the second-first engagement portion is a last one that engage with the second engaging portions when the striking mechanism moves in the second direction.

3. The driver according to claim 1 ,
wherein the second engaging portions include a first-second engaging portion having a first outer diameter and a second-second engaging portion having a second outer diameter, the second outer diameter being greater than the first outer diameter, and
wherein the first-second engaging portion and the second-second engaging portion are arranged in that order in the rotating direction.

4. The driver according to claim 3 , wherein among the second engagement portions, the second-second engaging portion is a last one that engage with the first engaging portions when the striking mechanism moves in the second direction.

5. The driver according to claim 1 , wherein the first engaging portions extend from the main body portion of the striking mechanism in a fourth direction crossing the first, second, and third directions.

6. The driver according to claim 1 ,
wherein the first support has a first region and a second region that are arranged in the rotating direction, the second region being closer to the drive shaft than the first region, and
wherein the second support has a third region and a fourth region that are arranged in the rotating direction, the fourth region being closer to the drive shaft than the third region.

7. The driver according to claim 1 ,
wherein the first direction is a direction in which the striking mechanism moves from a first position to a second position, the second direction is a direction in which the striking mechanism moves from the second position to the first position, and
wherein the driver further comprises a controller configured to, after striking the fastener, control the motor to drive the rotational element to engage the second engaging portions with the first engaging portions to move the striking mechanism in the second direction, and stop the striking mechanism at a standby position between the first position and the second position.

8. The driver according to claim 7 ,
wherein, when the striking mechanism moves from the first position to the second position, the second engaging portions are located outside an area through which the first engaging portions pass, and
wherein, when the striking mechanism is held in the standby position, at least two of the second engaging portions are located in the area.

9. The driver according to claim 1 , wherein the first moving mechanism includes a pressure chamber configured to move the striking mechanism in the first direction using gas pressure.

10. A driver comprising:
a striking mechanism operable to move in a first direction and a second direction opposite to the first direction;
a first moving mechanism configured to move the striking mechanism in the first direction to strike a fastener;
a motor; and
a second moving mechanism configured to move the striking mechanism in the second direction against a force of the first moving mechanism,
wherein the striking mechanism includes:
a main body portion extending in the first direction; and
first engaging portions disposed on the main body portion, and spaced apart from each other in the first direction,

wherein the second moving mechanism includes:
a rotational element rotated by the motor; and
second engaging portions spaced apart from each other in a rotation direction of the rotational element, the second engaging portions being engaged with and released from the first engaging portions, respectively, and

wherein the first engaging portions protruding from the main body portion in a direction intersecting with the first and second directions, and
wherein the first direction is a direction in which the striking mechanism moves from a first position to a second position, the second direction is a direction in which the striking mechanism moves from the second position to the first position,
wherein the driver further comprises a controller configured to, after striking the fastener, control the motor to drive the rotational element to engage the second engaging portions with the first engaging portions to move the striking mechanism in the second direction, and stop the striking mechanism at a standby position between the first position and the second position,
wherein the first engaging portions include a first-first engaging portion having a first protrusion amount from a center line of the main body portion and a second-first engaging portion having a second protruding amount from the center line of the main body portion, the second protruding amount being greater than the first protrusion amount, the center line of the main body portion being parallel with the first direction, and
wherein the first-first engaging portion and the second-first engaging portion are arranged in that order in the first direction.

11. The driver according to claim 10 ,
wherein the first engaging portions further include a third-first engaging portion, and
wherein the third-first engaging portion has a third protrusion amount shorter than the first and second protrusion amounts of the first-first and second-first engaging portions.

12. The driver according to claim 10 , wherein among the first engagement portions, the second-first engagement portion is a last one that engage with the second engaging portions when the striking mechanism moves in the second direction.

13. The driver according to claim 10 , wherein when the striking mechanism is held in the standby position, one or more of the

Assignees

• Koki Holdings Co Ltd

Inventors

• Saitou Takeshi
• Shige Tetsuhito
• KIYOHARA Daiki
• Nishida Masashi

Classifications

• B25D16/00 Primary

  Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} · CPC title

• B25C1/047 Primary

  Mechanical details · CPC title

• B25C1/06 Primary

  operated by electric power · CPC title

• B25D9/04

  of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member · CPC title

• B25D2250/371

  Use of springs · CPC title