DE-102025145722-A1 - POWER TOOL WITH A HAMMER MECHANISM

DE102025145722A1DE 102025145722 A1DE102025145722 A1DE 102025145722A1DE-102025145722-A1

Abstract

A power tool with a hammer mechanism comprises a tool holder, a motor, a drive mechanism, a tool body, a handle, and an actuating element. The handle is connected to the tool body and has a grip portion extending in a first direction intersecting a drive axis. The actuating element is located on a front side of the grip portion and is configured to be manually actuated by a user to command the start of the motor. The grip portion has, in the first direction intersecting the drive axis, a first end closer to the tool body and a second end farther from the tool body. The actuating element is located in a region of the grip portion that includes at least one midpoint of the grip portion which is substantially equidistant from the first and second ends in the first direction.

Inventors

Tomohiro Saeki
Masanori Furusawa
Yuji Sakakibara

Assignees

MAKITA CORPORATION

Dates

Publication Date: 20260513
Application Date: 20251106
Priority Date: 20241111

Claims (11)

Power tool with a hammer mechanism, comprising: a tool holder extending along a drive axis defining a front-back direction of the power tool and having a front end configured to removably hold a tool accessory selected from various types of tool accessories; a motor having an output shaft rotatable about a first axis of rotation; a drive mechanism operably connected to the output shaft and configured to linearly drive the tool accessory held by the tool holder along the drive axis when the motor is driven; a tool body extending along the drive axis and accommodating the tool holder, motor, and drive mechanism; a handle connected to the tool body having a grip portion extending in a first direction intersecting the drive axis; and an actuating component provided on a front side of the grip portion and configured to be manually actuated by a user to initiate the start of the motor; in which the grip portion in in the first direction has a first end that is closer to the tool body and a second end that is further away from the tool body, and the actuating component is arranged in a region of the handle part that has at least one central position of the handle part that is substantially equidistant from the first and second ends in the first direction.
Power tool with a hammer mechanism according to Claim 1 , in which the actuating component is located away from the first and second ends of the handle part in the first direction.
Power tool with a hammer mechanism according to Claim 2 , in which the actuating component is mounted by the handle part in such a way that it can slide linearly.
Power tool with a hammer mechanism according to Claim 1 , in which the actuating component extends from the first or the second end of the handle part to at least one position beyond the center position in the first direction.
Power tool with a hammer mechanism according to Claim 4 , in which the actuating component is mounted by the handle part in such a way that it can be rotated about an end part of the actuating component in a longitudinal direction.
Power tool with a hammer mechanism according to one of the Claims 1 until 5 , wherein the drive mechanism comprises (i) an intermediate shaft operably connected to the output shaft and rotated about a second axis of rotation by means of the rotation of the output shaft, (ii) an oscillating component arranged on the intermediate shaft and oscillated in the forward-backward direction by means of the rotation of the intermediate shaft, and (iii) a piston operably connected to the oscillating component and moved linearly back and forth along the drive axis by means of the oscillation of the oscillating component, the drive axis, the first axis of rotation and the second axis of rotation are parallel to each other, and the handle projects from the tool holder in one direction in the direction of the second axis of rotation.
Power tool with a hammer mechanism according to Claim 6 , in which the first axis of rotation of the output shaft is arranged between the drive shaft and the second axis of rotation of the intermediate shaft in the first direction.
Power tool with a hammer mechanism according to one of the Claims 1 until 7 , furthermore with a battery mounting part on which a battery is removablely mounted, wherein the drive shaft passes through the battery mounting part when the power tool is viewed in a second direction that is perpendicular to the front-back direction and the first direction.
Power tool with a hammer mechanism according to Claim 8 , wherein the battery mounting part has an engagement part configured to slide into engagement with the battery in a direction that crosses the drive axis.
Power tool with a hammer mechanism according to Claim 9 , in which the engagement part is configured to slide into engagement with the battery in the first direction.
Power tool with a hammer mechanism according to Claim 10 , in which the battery mounting part is arranged behind the handle part in the front-back direction, and the battery mounting part is configured such that the battery mounted on the battery mounting part is positioned on one side opposite to the second end of the handle part in the first direction relative to an area behind the handle part is where the user places a hand when holding the handle.

Description

TECHNICAL AREA The present disclosure relates to a power tool that incorporates a hammer mechanism. STATE OF THE ART A power tool incorporating a hammer mechanism is configured to perform a machining operation on a workpiece by striking and linearly driving a tool attachment along a drive axis. Various types of tool attachments, suitable for different machining operations, can be selectively mounted on the power tool. This relatively small, portable power tool, easily used for various machining operations, features both a pistol-grip and a loop grip, where a handle forms a loop with part of the tool body (see JP 2019 - 038 093 A or JP 2022 - 036 660 A ). BRIEF SUMMARY Both of the power tools described above, which feature a hammer mechanism, are designed with a handle shaped to allow a user to easily grip the handle and press a tool attachment onto a workpiece along the drive axis. Furthermore, an actuating component for starting the motor is positioned on the handle for easy activation when the handle is positioned vertically below the drive axis. However, the power tool offers potential for further improvement in usability when used in other positions. Accordingly, it is a non-restrictive objective of the present disclosure to provide a power tool with a hammer mechanism that exhibits excellent operability in various positions. The above-mentioned problem is solved by a power tool with a hammer mechanism according to claim 1. According to a non-restrictive aspect of the present disclosure, a power tool with a hammer mechanism is provided, comprising a tool holder, a motor, a drive mechanism, a tool body, a handle and an actuating component. The tool holder extends along a drive axis that defines a front-back direction for the power tool. A front end portion of the tool holder is configured to removably hold a tool accessory selected from various types. The motor has an output shaft that rotates about a first axis of rotation. The drive mechanism is operably connected to the output shaft. The drive mechanism is configured to linearly drive a tool accessory, held by the tool holder, along the drive axis when the motor is driven. The tool body extends along the drive axis and accommodates the tool holder, the motor, and the drive mechanism. The handle is connected to the tool body and includes a grip portion. The grip portion extends in a first direction that intersects the drive axis. The actuating component is located on a front side of the grip portion and is configured to be manually actuated by a user to initiate motor start. The handle has a first end closer to the tool body and a second end further away from the tool body. The actuating component is located in a region of the handle that has at least one central position of the handle which is substantially equidistant from the first and second ends in the first direction. The handle of the power tool with a hammer mechanism, as described above, has a grip section that extends in the first direction, intersecting the drive axis. The actuating component is configured to be manually operated by a user to initiate a motor start and is located in an area where the grip section is centered in the first direction (along the longitudinal direction of the grip section). Thus, the actuating component can be easily operated by one or more of the user's fingers, regardless of whether the user holds the grip section in an orientation (alignment) with their thumb on a first end (the side facing the tool body) of the grip section (hereinafter referred to as a normal orientation) or in an orientation (alignment) with their thumb on a second end (the opposite side facing the tool body) of the grip section (hereinafter referred to as a reverse orientation). Furthermore, the power tool can be used in various positions, but the orientation in which the handle is held does not significantly affect the operability of the actuating component, so that the power tool has excellent operability in various positions. BRIEF DESCRIPTION OF THE DRAWINGS 1 is a left side view of a power tool with a hammer mechanism (according to a first embodiment), wherein a battery (battery pack) is mounted on it.2 is a perspective rear view of the power tool with a hammer mechanism, with the battery removed.3 This is a perspective view of a needle scaler.4 This is a partial cross-sectional view of the needle scaler.5 is a cross-sectional view of the power tool with a hammer mechanism, where a tool accessory is pressed onto a workpiece.6 is a cross-sectional view along a line VI-VI in 5 .7 is an enlarged partial view of 5 .8 is a cross-sectional view along a line VIII-VIII in 5 and an explanatory view to show a load condition.9 Is a cross-sectional view appropriate to 7 and shows the power tool with the needle scaler mounted on it in a non-loaded state.10 Is a cross-sectional view appropriate to 7 and shows the power tool with a different tool accessory than the needle scaler mounted on it in a n