Power tool

• US 10,307,904 B2
• Filed: 02/01/2016
• Issued: 06/04/2019
• Est. Priority Date: 02/02/2015
• Status: Active Grant

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: Aoki, Yonosuke
• Primary Examiner(s): Lopez, Michelle
• Application Number:
  US15/012,015
• Publication Number:
  US 20160221175A1
• Time in Patent Office: 1,219 Days
• Field of Search: 173216
• CPC Class Codes: B23D 47/005 Vibration-damping
• CPC Class Codes: B23D 51/10 for hand-held or hand-operated devices
• CPC Class Codes: B23D 51/16 of drives or feed mechanisms for straight tools, e.g. saw blades, or bows
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades

Abstract

It is an object of the invention to provide a technique for increasing the degree of freedom in designing a grip part in order to improve operability of a power tool. A representative electric vibration tool 100 is provided which mainly includes a body housing 101, an inner housing 110, a driving motor 115 and a spindle 124. A blade 145 as a tool accessory is held between the spindle 124 and a clamp shaft 127 and driven by the driving motor 115. The driving motor 115 and the spindle 124 are housed within the inner housing 110. The inner housing 110 is housed within a front region of the body housing 101. A grip part 107 is arranged behind the front region of the body housing 101.

Claims

1. A power tool, which drives a tool accessory and performs an operation on a workpiece, comprising:

a motor,

a tool accessory driving shaft that has a rotation driving axis and is driven by the motor to reciprocatingly drive the tool accessory within a prescribed angular range around the rotation driving axis,

an inner housing that houses the motor and at least part of the tool accessory driving shaft,

an outer housing that has a first region for housing the inner housing and a second region which is different from the first region and configured to be held by a user during the operation of the power tool on the workpiece, and

an elastic member that is disposed between the inner housing and the outer housing and reduces transmission of vibration from the inner housing to the outer housing.

2. The power tool as defined in claim 1, wherein the tool accessory driving shaft has a longitudinal axis that is parallel to a rotation axis of the motor.

3. The power tool as defined in claim 1, wherein the elastic member is arranged around an axis of the tool accessory driving shaft.

4. The power tool as defined in claim 1, wherein the elastic member is arranged around a rotation axis of the motor.

5. The power tool as defined in claim 1, wherein the elastic member includes a first elastic member and a second elastic member, and the first elastic member and the second elastic member are separate members that are disposed on opposite sides of the inner housing in a direction of the rotation driving axis of the tool accessory driving shaft.

6. The power tool as defined in claim 1, comprising a motor power switch for turning on and off the motor, wherein the motor power switch is disposed in the outer housing.

7. The power tool as defined in claim 6, wherein the motor power switch has a power switch operation part which is configured to be manually operated by the user, and the power switch operation part is configured to be slidable along a prescribed direction.

8. The power tool as defined in claim 6, comprising a motor speed-changing switch for changing rotation speed of the motor, wherein the motor speed-changing switch is disposed in the outer housing.

9. The power tool as defined in claim 1, wherein a battery mounting part to which a battery can be mounted is provided on a side of the second region opposite to the first region.

10. The power tool as defined in claim 1, further comprising a plurality of separate and spaced cylindrical elastic elements, wherein each of the plurality of separate and spaced cylindrical elastic elements is disposed coaxially with the tool accessory driving shaft.

11. The power tool as defined in claim 1, further comprising:

a tool accessory holding member that can move between a clamp position to clamp the tool accessory between the tool accessory holding member and the tool accessory driving shaft in order to hold the tool accessory and a release position to release the clamping of the tool accessory in order to remove the tool accessory, and

a holding mechanism for holding the tool accessory holding member in the clamp position,

wherein the holding mechanism includes an engagement member that can engage with the tool accessory holding member in the clamp position, and a biasing member that biases the engagement member so as to provide the engagement member with a force of holding the tool accessory holding member in the clamp position.

12. The power tool as defined in claim 11, further comprising:

a transmitting member that is connected to the tool accessory driving shaft and transmits rotation of the motor to the tool accessory driving shaft, wherein;

the tool accessory is held on one end region of the tool accessory driving shaft and the engagement member is disposed on another end region of the tool accessory driving shaft in an axial direction of the tool accessory driving shaft from the one end region, and

the transmitting member is connected to the tool accessory driving shaft between ends of the tool accessory driving shaft.

13. The power tool as defined in 11, wherein the biasing member is disposed between an end of the tool accessory driving shaft and the transmitting member and biases the engagement member along the rotation driving axis of the tool accessory driving shaft.

14. A power tool, which drives a tool accessory and performs an operation on a workpiece, comprising:

a motor,

a tool accessory driving shaft that has a rotation driving axis and is driven by the motor to reciprocatingly drive the tool accessory within a prescribed angular range around the rotation driving axis,

an inner housing including;

a first portion that houses at least part of the tool accessory driving shaft,

a second portion that houses the motor, and

a partition wall that separates and is a complete barrier between the first portion and the second portion,

an outer housing that has a first region for housing the inner housing and a second region which is configured to be held by a user during the operation of the power tool on the workpiece, and

an elastic member that is disposed between the inner housing and the outer housing and reduces transmission of vibration from the inner housing to the outer housing.