Electric hair cutter

Abstract

The utility model discloses an electric hair cutter which comprises a cutter body and a cutter head assembly arranged at the front end of the cutter body, and the cutter head assembly is detachably connected with the cutter body through a connecting structure. The tool bit assembly is integrally and independently arranged, and when the tool bit assembly needs to be cleaned or replaced, the whole tool bit assembly can be quickly disassembled and separated from the machine body; during installation, the tool bit assembly can be rapidly installed on the machine body through the connecting structure, and a user can conveniently use the tool bit assembly. The connecting structure comprises a connecting convex buckle arranged on the tool bit shell and a connecting groove formed in the outer side wall of the machine body. The connecting structure is arranged on the outer side wall of the machine body instead of being arranged on the connecting end face of the tool bit assembly and the machine body, so that corresponding operation can be directly carried out on the connecting structure when the tool bit assembly is disassembled, the tool bit assembly is convenient to disassemble, and parts of the tool bit assembly cannot be loosened; the working effect of the electric hair cutter is improved, and the service life of the electric hair cutter is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric clipper technical field, especially electric clipper. BACKGROUND

[0002] Electric clipper is a common hair cutting and shaving tool, which is well known to all. It is mainly used for trimming human hair or animal hair. Generally, it includes an electric clipper head and an electric clipper body. The electric clipper head is arranged at the front end of the electric clipper body. The electric clipper head mainly includes a fixed blade, a movable blade, an adjusting wrench and other accessories. The tooth gap between the fixed blade and the movable blade is controlled by the adjusting wrench. The traditional electric clipper head is composed of scattered parts. When the head needs to be cleaned, the head parts can only be disassembled and cleaned. For ordinary users who are not professional, it is not easy to disassemble and install. After installation, the working effect of the head is easily affected.

[0003] With the development of electric clipper industry technology, electric clippers with a head arranged as a whole have appeared in the market. When the head needs to be cleaned, the whole head can be disassembled without disturbing the parts of the head. The installation is convenient and fast, and the use of the electric clipper is not affected after installation. There are two common installation methods for the electric clipper head: fixed connection by screw and clamping by embedded buckle. For the electric clipper with the head fixed by screw, when the head needs to be cleaned or replaced, the screws need to be removed one by one, and the screws need to be tightened one by one during installation. The operation is complicated and time-consuming. For the electric clipper with the head clamped by embedded buckle, the clamping structure is usually arranged on the connecting end face of the electric clipper head and the electric clipper body. When the head needs to be cleaned or replaced, the head needs to be grabbed and forced outward. During this process, the force first acts on the head, and then the buckle is pulled out of the clamping groove. When installing the head, the head needs to be grabbed and pressed inward with great force. During this process, the force first acts on the head, and then the buckle is clamped into the clamping groove. First, the disassembly and assembly are laborious, and frequent disassembly can cause the parts of the head to loosen, which poses a safety hazard and affects the service life of the head.

[0004] Therefore, it is necessary to improve the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defects and deficiencies of the prior art, and provides an electric clipper. The design of the whole and independent head assembly makes the disassembly, cleaning and installation of the head assembly simple and fast, which is convenient for users to use. The connection structure facilitates the disassembly of the head and does not cause the loosening of the parts of the head assembly, which is beneficial to improving the working effect of the electric clipper and prolonging the service life of the electric clipper.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] An electric clipper comprises a body and a cutter head assembly arranged at the front end of the body, the cutter head assembly is detachably connected with the body through a connecting structure, the cutter head assembly comprises a cutter head shell, a fixed blade, a movable blade and an adjusting wrench, the movable blade is movably connected with the fixed blade, the fixed blade is fixedly connected with a fixed blade holder, the fixed blade holder is slidably connected with the cutter head shell, the adjusting wrench is connected to the cutter head shell, and the adjusting wrench can rotate relative to the cutter head shell and synchronously drive the fixed blade holder to move relative to the cutter head shell, so as to change the distance between the movable blade and the fixed blade; the connecting structure comprises a connecting protrusion arranged on the cutter head shell and a connecting groove arranged on the outer side wall of the body, the cutter head shell is detachably fixedly connected to the front end of the body through the cooperation of the connecting protrusion and the connecting groove.

[0008] Further, one end of the cutter head shell close to the body is provided with a connecting piece, and the connecting protrusion is arranged on the side of the connecting piece facing the body.

[0009] Further, one end of the connecting protrusion close to the cutter head shell is provided with a first vertical surface, and the connecting groove is provided with a second vertical surface limiting cooperation with the first vertical surface.

[0010] Further, one end of the connecting protrusion away from the cutter head shell is provided with a first inclined surface, and the connecting groove is provided with a second inclined surface corresponding to the first inclined surface.

[0011] Further, a guide structure is arranged between the body and the cutter head assembly, the guide structure comprises a protruding rib arranged on the cutter head shell and a sliding groove arranged on the front end of the body corresponding to the protruding rib.

[0012] Further, a driving motor is arranged in the body and transmissionally cooperates with the movable blade, the cutter head shell is provided with a through hole through which the output shaft of the driving motor passes, and the protruding rib is arranged on the inner side wall of the through hole.

[0013] Further, an end cover is arranged at the front end of the body, the end cover is provided with a convex ring matched with the through hole, and the sliding groove is arranged on the convex ring.

[0014] Further, an eccentric shaft is arranged on the output shaft of the driving motor, and the eccentric shaft is transmissionally connected to the movable blade.

[0015] Further, the cutter head shell is provided with a guide rail, the fixed blade holder is provided with a bent edge slidably cooperating with the guide rail, and the fixed blade holder is slidably connected with the cutter head shell through the cooperation of the bent edge and the guide rail.

[0016] Further, the cutter head assembly further comprises a bolt and a rotation-stopping nut, the bolt is sequentially inserted into the cutter head shell and screwed with the rotation-stopping nut after passing through the adjusting wrench, the fixed cutter holder and the cutter head shell.

[0017] After the above structure is adopted, the utility model has the beneficial effects that:

[0018] (1) The utility model discloses a kind of electric hair clippers, including body and the cutter head assembly of being set to the front end of body, the cutter head assembly with the body is detachably connected by connecting structure. The cutter head assembly of the utility model is integrally, independently arranged, when needing to clean or replace cutter head assembly, entire cutter head assembly can be quickly disassembled, and separate from body;When installing, cutter head assembly can be quickly installed on body by connecting structure. The design of integrally, independent cutter head assembly makes the disassembly, cleaning, installation of cutter head assembly simple and fast, facilitate user to use.

[0019] (2) The utility model discloses a kind of electric hair clippers, the connecting structure includes the connecting convex buckle being set on cutter head shell and the connecting concave groove being set on the lateral wall of body, the cutter head shell is detachably fixedly connected to the front end of body by the connecting convex buckle with the connecting concave groove cooperation. The connecting structure of the utility model is set on the lateral wall of body, not set on the connecting end face of cutter head assembly and body, so that when disassembling cutter head assembly, corresponding operation can be directly carried out on connecting structure, specifically, when disassembling cutter head assembly, the force of being away from connecting concave groove can be applied to connecting convex buckle, so that first vertical surface and second vertical surface are separated from limit cooperation, then hold cutter head assembly and force in the direction of being away from body, cutter head assembly can be pulled out. The structure design is convenient for the disassembly of cutter head assembly, and will not cause the loosening of parts of cutter head assembly, beneficial to improve the working effect of electric hair clipper and prolong the service life of electric hair clipper.

[0020] (3) The utility model discloses a kind of electric hair clippers, the cutter head assembly includes cutter head shell, fixed blade, moving blade and adjusting wrench, the moving blade is movably cooperated with fixed blade, the fixed blade is fixedly connected with fixed cutter holder, the fixed cutter holder is slidably connected with cutter head shell, the adjusting wrench is connected to cutter head shell, and the adjusting wrench can be rotated relative to cutter head shell and simultaneously drive fixed cutter holder to move relative to cutter head shell, to change the interval between moving blade and fixed blade. The electric hair clipper commonly seen in market is designed on body, when discovering that the tooth interval between fixed blade and moving blade of cutter head assembly is unqualified, cutter head assembly and body need to be assembled to realize the adjustment of the tooth interval between fixed blade and moving blade. The utility model designs the adjusting wrench on cutter head assembly, to facilitate the timely adjustment of the tooth interval between fixed blade and moving blade, improve the qualified rate of cutter head assembly. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiment of the present application, the following will be a brief description of the drawings needed to be used in the description of the specific embodiment, obviously, the following description of the drawings is some embodiments of the present application, for those skilled in the art, without creative labor, according to these drawings, other drawings can also be obtained.

[0022] Figure 1 is the overall structure of the present application schematic diagram;

[0023] Figure 2 is the overall structure of the present application sectional view (partially);

[0024] Figure 3 is the overall structure of the present application exploded view;

[0025] Figure 4 is the overall structure of the present application exploded sectional view (partially);

[0026] Figure 5 is the exploded view of the tool bit assembly of the present application;

[0027] Figure 6 is the three-dimensional schematic diagram of the tool bit shell of the present application;

[0028] Figure 7 is the three-dimensional schematic diagram of the end cover of the present application.

[0029] Figures 1 to 7 The reference numerals are:

[0030] 1, the fuselage; 11, the driving motor; 111, the output shaft; 112, the eccentric shaft; 12, the end cover; 121, the convex ring; 2, the tool bit assembly; 21, the tool bit shell; 211, the guide rail; 22, the fixed blade; 23, the moving blade; 231, the moving knife holder; 2311, the clamping groove; 24, the adjusting wrench; 25, the fixed knife holder; 251, the bent edge; 26, the through hole; 27, the bolt; 28, the rotation-stopping nut; 3, the connecting structure; 31, the connecting convex buckle; 311, the first vertical surface; 312, the first inclined surface; 32, the connecting groove; 321, the second vertical surface; 322, the second inclined surface; 33, the connecting piece; 331, the indicating mark; 4, the guide structure; 41, the convex rib; 42, the sliding groove. DETAILED DESCRIPTION

[0031] In order to make the above object, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of the term "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the utility model, unless another definite provision and limitation, if there appear first feature on second feature "on" or "under" and similar description, its meaning can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature "on", "above" and "on" second feature can be first feature on second feature directly or obliquely, or just indicate first feature horizontal height higher than second feature. First feature "under", "below" and "under" second feature can be first feature under second feature directly or obliquely, or just indicate first feature horizontal height less than second feature.

[0036] It should be noted that if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions as used herein are for purposes of explanation only and are not intended to be limiting.

[0037] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0038] As Figures 1 to 7As shown, an electric clipper includes a body 1 and a cutter head assembly 2 arranged at the front end of the body 1, the cutter head assembly 2 is detachably connected with the body 1 through a connecting structure 3, the cutter head assembly 2 includes a cutter head shell 21, a fixed blade 22, a movable blade 23 and an adjusting wrench 24, the movable blade 23 is movably connected with the fixed blade 22, the fixed blade 22 is fixedly connected with a fixed blade holder 25, the fixed blade holder 25 is slidably connected with the cutter head shell 21, the adjusting wrench 24 is connected to the cutter head shell 21, and the adjusting wrench 24 can rotate relative to the cutter head shell 21 and synchronously drive the fixed blade holder 25 to move relative to the cutter head shell 21, so as to change the distance between the movable blade 23 and the fixed blade 22; the connecting structure 3 includes a connecting protruding buckle 31 arranged on the cutter head shell 21 and a connecting recess 32 arranged on the outer side wall of the body 1, and the cutter head shell 21 is detachably fixedly connected to the front end of the body 1 through the connecting of the connecting protruding buckle 31 and the connecting recess 32. One end of the cutter head shell 21 close to the body 1 is provided with a connecting piece 33, and the connecting protruding buckle 31 is arranged on one side of the connecting piece 33 facing the body 1. One end of the connecting protruding buckle 31 close to the cutter head shell 21 is provided with a first vertical surface 311, and the connecting recess 32 is provided with a second vertical surface 321 limiting cooperation with the first vertical surface 311. One end of the connecting protruding buckle 31 away from the cutter head shell 21 is provided with a first inclined surface 312, and the connecting recess 32 is provided with a second inclined surface 322 corresponding to the first inclined surface 312.

[0039] The utility model wants to solve is provide a kind of electric clipper, including body 1 and the cutter head assembly 2 arranged at the front end of body 1, the cutter head assembly 2 with the body 1 is detachably connected by connecting structure 3. The cutter head assembly 2 of the utility model is integrally, independently arranged, when needing to clean or replace cutter head assembly 2, entire cutter head assembly 2 can be quickly disassembled, and is separated from body 1;When installing, cutter head assembly 2 can be quickly installed on body 1 by connecting structure 3. The design of integrally, independent cutter head assembly 2 makes the disassembly, cleaning, installation of cutter head assembly 2 simple and fast, and facilitates user use. The connecting structure 3 includes connecting protruding buckle 31 arranged on cutter head shell 21 and connecting recess 32 arranged on the outer side wall of body 1, and the cutter head shell 21 is detachably fixedly connected to the front end of the body 1 by the connecting of the connecting protruding buckle 31 and the connecting recess 32. In the embodiment, as shown in the figure, Figure 1 and Figure 2As shown, the connecting structure 3 is arranged on the outer side wall of the body 1 instead of being arranged on the connecting end face of the head assembly 2 and the body 1, so that when the head assembly 2 is disassembled, the corresponding operation can be directly performed on the connecting structure 3. Specifically, when the head assembly 2 is disassembled, the action force away from the connecting groove 32 can be applied to the connecting protrusion 31, so that the first vertical surface 311 and the second vertical surface 321 are disengaged from the limiting cooperation, and then the head assembly 2 is gripped and forced to move away from the body 1, and the head assembly 2 can be pulled out. The structure design facilitates the disassembly of the head assembly 2, and does not cause the loosening of the parts of the head assembly 2, which is beneficial to improve the working effect of the electric clipper and prolong the service life of the electric clipper.

[0040] In further preferred embodiments, the connecting protrusion 31 is provided with a first inclined surface 312 at one end away from the head shell 21. When the head assembly 2 is disassembled, the user can conveniently apply the action force to the connecting piece 33 through the first inclined surface 312. In other preferred embodiments, the side of the connecting piece 33 away from the body 11 is provided with an indication mark 331 for guiding the user to apply the force in a direction when disassembling the head assembly 2.

[0041] As another preferred scheme of the utility model, the body 1 and the head assembly 2 are provided with a guide structure 4, the guide structure 4 comprises a convex rib 41 arranged on the head shell 21 and a sliding groove 42 arranged on the front end of the body 1 and corresponding to the convex rib 41. The body 1 is provided with a driving motor 11 in transmission cooperation with the moving blade 23, the head shell 21 is provided with a through hole 26 for the output shaft 111 of the driving motor 11 to pass through, and the convex rib 41 is arranged on the inner side wall of the through hole 26. The front end of the body 1 is provided with an end cover 12, the end cover 12 is provided with a convex ring 121 matched with the through hole 26, and the sliding groove 42 is arranged on the convex ring 121. In this embodiment, as shown in Figure 3 、 Figure 6 and Figure 7 As shown, when the head assembly 2 is installed, the convex ring 121 is inserted into the through hole 26, the convex rib 41 is inserted into the sliding groove 42, until the connecting protrusion 31 is clamped into the connecting groove 32, the circumferential rapid positioning of the head assembly 2 relative to the body 1 is realized through the cooperation of the convex rib 41 and the sliding groove 42, and the head assembly 2 and the body 1 realize the rotation-stopping cooperation. In this embodiment, the connecting piece 33 is elastic, so that when the connecting protrusion 31 moves above the connecting groove 32, it can be automatically clamped into the connecting groove 32; and the connecting piece 33 can be deformed when subjected to external force, driving the connecting protrusion 31 to move out of the connecting groove 32.

[0042] As another preferred scheme of the utility model, eccentric shaft 112 is arranged on the output shaft 111 of the driving motor 11, and the eccentric shaft 112 is drivingly connected to the moving blade 23. The moving blade 23 is fixedly connected with a moving blade holder 231, the moving blade holder 231 is provided with a clamping groove 2311, and the eccentric shaft 112 is connected to the clamping groove 2311. In the embodiment, as shown in Figure 2 And Figure 5 The eccentric shaft 112 is arranged so that the circumferential rotation of the driving motor 11 is converted into the left-right reciprocating motion of the moving blade 23, and the moving blade 23 cooperates with the fixed blade 22 to realize the function of cutting and trimming hair.

[0043] As another preferred scheme of the utility model, the cutter head shell 21 is provided with a guide rail 211, the fixed blade holder 25 is provided with a bent edge 251 that is slidingly matched with the guide rail 211, and the fixed blade holder 25 is slidingly connected with the cutter head shell 21 through the cooperation of the bent edge 251 and the guide rail 211. The cutter head assembly 2 further comprises a bolt 27 and a rotation-stopping nut 28, the bolt 27 is sequentially inserted into the cutter head shell 21 and is screwingly matched with the rotation-stopping nut 28 after passing through the adjusting wrench 24, the fixed blade holder 25 and the cutter head shell 21. The inside of the cutter head shell 21 is provided with a mounting clamping groove 2311 for clamping the rotation-stopping nut 28, and the mounting clamping groove 2311 is used for limiting the rotation of the rotation-stopping nut 28 relative to the cutter head shell 21. In the embodiment, as shown in Figure 5 And Figure 6 The fixed blade 22 is fixedly connected to the fixed blade holder 25, the fixed blade holder 25 is slidingly connected with the cutter head shell 21 through the cooperation of the guide rail 211 and the bent edge 251, and the fixed blade 22 is moved in the front-back reverse direction. The common electric hair clippers on the market are designed with the adjusting wrench 24 on the machine body 1, and when it is found that the tooth spacing between the fixed blade 22 and the moving blade 23 of the cutter head assembly 2 is unqualified, the cutter head assembly 2 needs to be assembled with the machine body 1 to adjust the tooth spacing between the fixed blade 22 and the moving blade 23. The adjusting wrench 24 is arranged on the cutter head assembly 2 in the embodiment, so that the tooth spacing between the fixed blade 22 and the moving blade 23 can be adjusted in time, and the qualified rate of the cutter head assembly 2 is improved.

[0044] In the embodiment, the adjusting wrench 24 is installed on the cutter head shell 21 through the bolt 27, and the inside of the cutter head shell 21 is provided with a mounting clamping groove 2311 for limiting the rotation of the rotation-stopping nut 28, so that the adjusting wrench 24 is installed on the cutter head shell 21.

[0045] Obviously, the above embodiments are merely exemplary and not limiting. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. An electric clipper comprising a body (1) and a cutter head assembly (2) arranged at the front end of the body (1), the cutter head assembly (2) being detachably connected with the body (1) through a connecting structure (3), characterized in that: The tool head assembly (2) comprises a tool head shell (21), a fixed blade (22), a movable blade (23) and an adjusting wrench (24), the movable blade (23) is movably connected with the fixed blade (22), the fixed blade (22) is fixedly connected with a fixed blade holder (25), the fixed blade holder (25) is slidably connected with the tool head shell (21), the adjusting wrench (24) is connected to the tool head shell (21), and the adjusting wrench (24) can rotate relative to the tool head shell (21) and synchronously drive the fixed blade holder (25) to move relative to the tool head shell (21), so as to change the distance between the movable blade (23) and the fixed blade (22); the connecting structure (3) comprises a connecting protrusion (31) arranged on the tool head shell (21) and a connecting groove (32) arranged on the outer wall of the fuselage (1), and the tool head shell (21) is detachably fixedly connected to the front end of the fuselage (1) through the cooperation of the connecting protrusion (31) and the connecting groove (32).

2. An electric clipper according to claim 1, characterized in that: One end of the tool head shell (21) close to the fuselage (1) is provided with a connecting piece (33), and the connecting protrusion (31) is arranged on one side of the connecting piece (33) facing the fuselage (1).

3. An electric clipper according to claim 1 or 2, characterized in that: One end of the connecting protrusion (31) close to the tool head shell (21) is provided with a first vertical surface (311), and the connecting groove (32) is provided with a second vertical surface (321) limiting cooperation with the first vertical surface (311).

4. An electric clipper according to claim 3, characterized in that: One end of the connecting protrusion (31) away from the tool head shell (21) is provided with a first inclined surface (312), and the connecting groove (32) is provided with a second inclined surface (322) corresponding to the first inclined surface (312).

5. The electric clipper according to claim 1, characterized in that: The connecting structure (3) comprises a connecting protrusion (31) arranged on the tool head shell (21) and a connecting groove (32) arranged on the outer wall of the fuselage (1), and the tool head shell (21) is detachably fixedly connected to the front end of the fuselage (1) through the cooperation of the connecting protrusion (31) and the connecting groove (32).

6. An electric clipper according to claim 5, characterized in that: The fuselage (1) is provided with a driving motor (11) in transmission cooperation with the movable blade (23), the tool head shell (21) is provided with a through hole (26) through which the output shaft (111) of the driving motor (11) passes, and the convex rib (41) is arranged on the inner side wall of the through hole (26).

7. An electric clipper according to claim 6, characterized in that: The front end of the fuselage (1) is provided with an end cover (12), the end cover (12) is provided with a convex ring (121) matched with the through hole (26), and the sliding groove (42) is arranged on the convex ring (121).

8. An electric clipper according to claim 6, characterized in that: The output shaft (111) of the driving motor (11) is provided with an eccentric shaft (112), and the eccentric shaft (112) is drivingly connected to the movable blade (23).

9. The electric clipper according to claim 1, characterized in that: The tool head shell (21) is provided with a guide rail (211), the fixed blade holder (25) is provided with a bent edge (251) slidably connected with the guide rail (211), and the fixed blade holder (25) is slidably connected with the tool head shell (21) through the cooperation of the bent edge (251) and the guide rail (211).

10. The electric clipper according to claim 1, characterized in that: The tool bit assembly (2) further comprises a bolt (27) and a rotation-stopping nut (28), the bolt (27) is sequentially inserted into the tool bit housing (21) through an adjusting wrench (24), a fixed tool holder (25) and the tool bit housing (21) and is screwed with the rotation-stopping nut (28) in the tool bit housing (21).

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