DE-102025145712-A1 - ELECTRIC NEEDLE TRAUSTER

DE102025145712A1DE 102025145712 A1DE102025145712 A1DE 102025145712A1DE-102025145712-A1

Abstract

A needle scaler comprises a tool body, a motor, a battery mounting part, a hammer mechanism, a first locking part, and a tool holder. The battery mounting part is configured to removably accommodate a battery. The first locking part is provided on a front end portion of the tool body. The tool holder comprises (i) a second locking part that is removably locked to the first locking part, and (ii) a release mechanism comprising needles mounted to be movable in the respective axial directions of the needles. The hammer mechanism comprises (i) 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) a striking piston which moves back and forth along the drive axis in conjunction with the reciprocating motion of the reciprocating component and transmits a hammering force to the needles which are held by the tool holder.

Inventors

Tomohiro Saeki
Masanori Furusawa
Kei Watanabe
Yuji Sakakibara

Assignees

MAKITA CORPORATION

Dates

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

Claims (12)

Electric needle scaler, comprising: a tool body, at least a 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 hammer mechanism housed in the tool body; a first locking part provided at a front end part of the tool body; and a tool holder comprising (i) a second locking part removably locked to the first locking part; and (ii) a release mechanism comprising needles mounted to be movable in respective axial directions of the needles; in which: the hammer mechanism (i) is a reciprocating component operably connected to the output shaft of the motor and reciprocates along the drive axis in conjunction with the rotation of the output shaft. and (ii) has a striking piston which moves back and forth along the drive axis in conjunction with the reciprocating motion of the reciprocating component and transmits a hammering force to the needles which are held by the tool holder.
Needle scaler Claim 1 , in which the hammer mechanism further comprises a striking bolt which is struck by the piston and transmits the hammer force to the needles.
Needle scaler Claim 1 or 2 , wherein the tool holder has an actuating part configured to change the position of the second locking part to (i) a locking position in which the second locking part is locked to the first locking part, and (ii) an unlocking position in which the second locking part is unlocked from the first locking part.
Needle scaler Claim 1 or 2 , wherein the hammer mechanism (i) comprises an intermediate shaft which is operably connected to the output shaft and 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 oscillates in the front-back direction in conjunction with a rotation of the intermediate shaft, and the reciprocating component is operably connected to the oscillating component and moves linearly back and forth along the drive axis in conjunction with the oscillation of the oscillating component.
Needle scaler according to one of the Claims 1 until 4 , 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 air fluctuations caused in the air chamber by the reciprocating movement of the piston.
Needle scaler Claim 5 , 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 according to one of the Claims 1 until 4 , in which the hammer mechanism has an elastic component that elastically connects the reciprocating component and the striking piston, and the striking 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 scaler according to one of the Claims 1 until 7 , wherein the release mechanism comprises a needle housing having a front end having an opening through which the needles are inserted, a bearing that supports the needles so that they are movable in the respective axial directions, and an anvil arranged between the hammer mechanism and the bearing in the front-back direction and configured to apply the hammer force to the needles by being struck by the hammer mechanism, 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 an outer circumferential edge of the base and configured to slide in the front-back direction along the drive axis within the needle housing, the anvil (i) a large-diameter part which is configured to slide in the front-back direction along the drive axis within the needle housing, and (ii) has a small diameter portion projecting forward from the large diameter portion and having a smaller outer diameter than the large diameter portion, and a rear end portion of the circumferential wall of the bearing configured to fit onto the small diameter portion 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, a bearing that supports the needles so that they are movable in the respective axial directions and is configured to slide along the needle housing in the front-back direction along the drive axis, and an anvil arranged between the hammer mechanism and the bearing in the front-back direction and configured to slide within the needle housing in the front-back direction along the drive axis, wherein the anvil is configured to apply the hammer force to the needles by being struck by the hammer mechanism, and the needle scaler has an elastic element 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 , furthermore 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 command 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 front of the needles for illuminating an area.

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. According to a non-limiting aspect of the present disclosure, an electric needle scaler is provided comprising a tool body, a motor, a battery mounting part, a hammer mechanism, a first locking part and a tool holder. At least part of the tool body extends along a drive axis that defines a front-back direction for 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 part is configured to removably accommodate a battery (battery pack). The hammer mechanism is housed within the tool body. The first locking part is located at a front end of the tool body. The tool holder has (i) a second locking part that is removably locked to the first locking part, and (ii) a release mechanism (de-rusting mechanism, peeling mechanism, stripping mechanism, removal mechanism, scaling mechanism) comprising needles mounted to be movable in their respective axial directions. The hammer mechanism comprises (i) a reciprocating component which is operably connected to the output shaft of the motor and moves back and forth along the drive axis in conjunction with the rotation of the output shaft, and (ii) a striking piston which moves back and forth along the drive axis in conjunction with the reciprocating motion of the reciprocating component and transmits a hammering force to the needles which are held by the tool holder. The needle scaler, as designed, is configured such that the tool holder, which holds the release mechanism, is removable and locked to the tool body by a second locking element, which engages with the first locking element. This facilitates replacement of the release mechanism and improves the ease of use of the needle scaler. Furthermore, the needle scaler features a battery mounting bracket. Therefore, it offers excellent usability and portability, as well as a high level of user comfort, compared to needle scalers powered by an external mains source. The battery and tool holder can also be removed from the battery mounting bracket and the tool body. This reduces the size of the required container (case) for the needle scaler and improves its portability when not in use. According to a further, non-limiting aspect of the present disclosure, a tool holder is provided for a rechargeable needle scaler. The tool holder has a second locking part which is removably locked to a first locking part which is provided on a front end part of a tool body of the needle scaler, and a release mechanism which has needles which are mounted such that they are movable in respective axial directions of the needles. The tool holder, according to this aspect, is configured to be removable from the The tool body is locked by the second locking part, which locks with the first locking part. Therefore, the needle scaler's release mechanism can be easily replaced. 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 VI-VI in 4 .7 is a left side view of a needle scaler according to a second embodiment.8 This is a cross-sectional view of the needle scaler.9 This is a perspective rear view of the needle scaler, with a battery removed.10 is a cross-sectional view along a line XX in 8 .11 This is an explanatory view to show one way of using the needle scaler.12 is an explanatory view showing a needle scaler according to a third embodiment.13 This is an enlarged cross-sectional view showing a hammer mechanism and a tool holder.14 This is an explanatory vie