DE-102025145705-A1 - ELECTRIC NEEDLE TRAUSTER

DE102025145705A1DE 102025145705 A1DE102025145705 A1DE 102025145705A1DE-102025145705-A1

Abstract

A needle scaler comprises a tool body, at least part of which extends along a drive axis defining a front-back direction of the scaler, an electric motor housed within the tool body, a battery mounting component configured to removably accommodate a battery, a power transmission mechanism housed within the tool body, and a release mechanism supported by a front end portion of the tool body. The release mechanism includes needles. The needles project forward such that they are exposed by the tool body and are supported to be movable in their respective axial directions. The power transmission mechanism comprises a power transmission component. The power transmission component is operably connected to the output shaft of the motor and moves back and forth along the drive axis, utilizing the rotation of the output shaft, and transmits an axial force to the needles.

Inventors

Tomohiro Saeki
Masanori Furusawa
Kei Watanabe
Yuji Sakakibara

Assignees

MAKITA CORPORATION

Dates

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

Claims (13)

Electric needle scaler, comprising: a tool body, at least part of which extends along a drive axis defining a front-back direction of the needle scaler; an electric motor housed in the tool body and having an output shaft rotatable about a first axis of rotation; a battery mounting part configured to removably accommodate a battery; a power transmission mechanism housed in the tool body; and a release mechanism supported by a front end part of the tool body and comprising needles projecting forward such that they are exposed from the tool body and supported such that they are movable in the respective axial directions of the needles; in which: the power transmission mechanism comprises a power transmission part operably connected to the output shaft of the motor and moving back and forth along the drive axis by utilizing the rotation of the output shaft, thereby transmitting a force to the needles in the respective axial directions.
Needle scaler Claim 1 , wherein the power transmission mechanism (i) comprises a reciprocating component which is operably connected to the output shaft of the motor and which moves back and forth along the drive axis in conjunction with the rotation of the output shaft, and (ii) comprises a percussion piston as the power transmission component which applies a hammer force to the needles by reciprocating the reciprocating component.
Needle scaler Claim 2 , wherein the power transmission mechanism (i) comprises an intermediate shaft which is operably connected to the output shaft and which rotates about a second axis of rotation parallel to the first axis of rotation in conjunction with the rotation of the output shaft, and (ii) comprises an oscillating component which is arranged on the intermediate shaft and which oscillates in the front-back direction in conjunction with the rotation of the intermediate shaft, and the reciprocating component which is operably connected to the oscillating component and which moves linearly back and forth along the drive axis in conjunction with the oscillation of the oscillating component.
Needle scaler Claim 2 or 3 , in which the reciprocating component has a piston that forms an air chamber between the reciprocating component and the impact piston, and the impact piston moves back and forth along the drive axis by pressure fluctuations generated in the air chamber by the reciprocating movement of the piston.
Needle scaler Claim 4 , in which the piston has a cylindrical piston cylinder with a base, the impact piston is slidable along the drive axis within the piston cylinder, and the air chamber between a base of the piston cylinder and the impact piston is defined.
Needle scaler Claim 2 or 3 , in which the power transmission mechanism further comprises an elastic component that elastically connects the reciprocating component and the impact piston, and the impact piston moves back and forth along the drive axis by an elastic force of the elastic component, which is generated by the reciprocating motion of the reciprocating component.
Needle scorcher after one of the Claims 1 until 6 , furthermore with a sleeve that is arranged within the front end part of the tool body and holds the release mechanism, wherein the front end part of the tool body is made of a synthetic resin, and the sleeve is made of a metal and is integral with the front end part.
Needle scorcher after one of the Claims 1 until 7 , wherein the release mechanism comprises a needle housing having a front end with an opening through which the needles are inserted and fixed to the tool body, a bearing that supports the needles so that they are movable in the respective axial directions, and an anvil arranged between the power transmission part and the bearing in the front-back direction and configured to apply the axial force to the needles by striking through the power transmission part, wherein the bearing has a cylindrical shape with a base, and (i) a base having holes through which the needles are each inserted, and (ii) a circumferential wall having a cylindrical shape extending rearward from a circumferential edge of the base and con The anvil is configured to slide in the front-back direction along the drive axis within the needle housing, the anvil (i) having a large diameter part configured to slide in the front-back direction along the drive axis within the needle housing, and (ii) having a small diameter part projecting forward from the large diameter part and having a smaller outside diameter than the large diameter part, and a rear end part of the circumferential wall of the bearing configured to fit onto the small diameter part of the anvil.
Needle scaler Claim 8 , in which an end part of each of the needles is movable in the axial direction within a space defined between the bottom of the bearing and the anvil in the front-back direction and surrounded by the circumferential wall of the bearing.
Needle scorcher after one of the Claims 1 until 9 , wherein the release mechanism comprises a needle housing having a front end with an opening through which the needles are inserted and fixed to the tool body, a bearing that supports the needles in such a way that they are movable in the respective axial directions and is configured to slide in the front-back direction along the drive axis within the needle housing, and an anvil that is arranged between the power transmission part and the bearing in the front-back direction and is configured to slide in the front-back direction along the drive axis within the needle housing, wherein the anvil is configured to apply the axial force to the needles by being struck through the power transmission part, and the needle scaler has an elastic element that is arranged between the anvil and a rear end part of the needle housing in the front-back direction.
Needle scorcher after one of the Claims 1 until 10 , further comprising a handle connected to the tool body and having a handle part extending in a first direction intersecting the drive axis, and an actuating component provided on a front side of the handle part and configured to be manually actuated by a user to instruct the start of the motor, wherein the handle part has a first end closer to the tool body and a second end further away from the tool body in the first direction, and the actuating component is arranged in a region of the handle part having at least one central position of the handle part which is substantially equidistant from the first and second ends in the first direction.
Needle scorcher after one of the Claims 1 until 11 , furthermore with a lighting device arranged in such a way as to illuminate an area in front of the needles.
Electric needle scaler, comprising: a tool body, at least part of which extends along a drive axis defining a front-back direction of the needle scaler; an electric motor housed in the tool body and having an output shaft rotatable about a first axis of rotation; a hammer mechanism housed in the tool body; and a release mechanism supported by a front end portion of the tool body and comprising needles projecting forward such that they are exposed by the tool body and are supported such that they are movable in the respective axial directions of the needles; in which the hammer mechanism comprises (i) a piston operably connected to the output shaft of the motor and reciprocating along the drive axis in conjunction with the rotation of the output shaft; and (ii) a striking piston reciprocating along the drive axis by pressure fluctuations caused in an air chamber by a reciprocating motion of the piston, and exerting a hammer force upon applies the needles.

Description

TECHNICAL AREA The present disclosure relates to an electric needle scaler (needle stripper, needle scaler). STATE OF THE ART A needle scaler (also called a needle gun scaler or needle gun) is a tool for removing foreign material from the surface of a workpiece. The needle scaler has a number of needles (also called pins), each mounted axially movable by a bearing. The needle scaler is configured to remove foreign material from the surface of a workpiece by applying hammer force to the needles and striking the workpiece with the tips of the needles. For example, a needle scaler used in the JP S63 - 034 865 Y It is revealed to be configured to strike an anvil with a hammer which is moved back and forth by an electric motor, so that a hammer force is applied to the needles above the anvil. BRIEF SUMMARY The needle scaler is to be further improved in terms of durability and user-friendliness. It is therefore a non-restrictive objective of the present disclosure to provide a technique that contributes to an improvement in the durability and user-friendliness of an electric needle scaler. The above-mentioned problem is solved by an electric needle scaler according to claim 1 or claim 13. According to a non-restrictive aspect of the present disclosure, an electric needle scaler is provided which has a tool body, a motor, a battery mounting part, a power transmission mechanism and a removal mechanism (derusting mechanism, peeling mechanism, stripping mechanism, removal mechanism, scaling mechanism). At least part of the tool body extends along a drive axis that defines the forward and reverse direction of the needle scaler. The motor is an electric motor and is housed within the tool body. The motor has an output shaft that is rotatable about a first axis of rotation. The battery mounting component is configured to accept a removable battery (battery pack). The power transmission mechanism is housed within the tool body. The release mechanism includes needles. The needles project forward so that they are exposed by the tool body and are mounted to allow movement in their respective axial directions. The power transmission mechanism includes a power transmission component. The power transmission component is operationally connected to the motor's output shaft and moves back and forth along the drive axis by utilizing the rotation of the output shaft, transmitting power to the needles in their respective axial directions. The needle scaler, in this respect, features a battery mounting bracket to which a battery can be attached. Therefore, this needle scaler offers excellent ease of use and portability, and thus superior user comfort compared to a needle scaler that requires an external power source. According to another non-restrictive aspect of the present disclosure, an electric needle scaler is provided which includes a tool body, a motor, a hammer mechanism and a release mechanism. The tool body extends along a drive axis that defines the forward-reverse direction of the needle scaler. The motor is an electric motor and is housed within the tool body. The motor has an output shaft that is rotatable about a first axis of rotation. The hammer mechanism is also housed within the tool body. The peeling mechanism is supported by a front end portion of the tool body and includes needles. The needles project forward, so that they are exposed by the tool body, and are mounted to be movable in their respective axial directions. The hammer mechanism includes a piston and a striking piston. The piston is operatively connected to the motor's output shaft and configured to move back and forth along the drive axis in conjunction with the rotation of the output shaft. The striking piston is configured to move back and forth along the drive axis by means of pressure fluctuations generated in an air chamber by the piston's reciprocating motion, thereby applying a hammering force to the needles. According to this aspect, the needle scaler features a hammer mechanism which is operated by The hammer mechanism is driven by the power of the electric motor. The hammer mechanism moves the impact piston back and forth through the action of the air spring, or more specifically, through pressure fluctuations generated in the air chamber by the piston's reciprocating motion, applying a hammering force to the needles of the detachment mechanism. Therefore, the needle scaler is designed with excellent durability compared to a structure where the piston and impact piston are connected by a mechanical spring (such as a compression coil spring) to apply the hammering force. BRIEF DESCRIPTION OF THE DRAWINGS 1 is a left side view of a needle scaler according to a first embodiment.2 This is a perspective front view of the needle scaler.3 This is a cross-sectional view of the needle scaler.4 is a cross-sectional view along a line IV-IV in 1 .5 is an enlarged partial view of 3 .6 is a cross-sectional view along a line IV-IV in 4 .7 is a left side v