CN110614602A

CN110614602A - Screwdriver for electric power

Info

Publication number: CN110614602A
Application number: CN201910756663.9A
Authority: CN
Inventors: 张瑞; 王其林; 郑润蓝; 冯宗建; 陈文广; 程景清; 王勋江; 童斯琦
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2019-12-27

Abstract

The invention relates to a screwdriver for electric power, which comprises an insulating handle, a metal screwdriver handle and an insulating protection structure. One end of the metal knife handle is arranged on the insulating handle, and the other end of the metal knife handle is provided with a metal knife head. The insulation protection structure comprises a fixed insulation sleeve and a movable insulation sleeve. The fixed insulating sleeve is sleeved at one end of the metal knife handle close to the insulating handle. The length of the fixed insulating sleeve is less than or equal to that of the metal knife handle. The movable insulating sleeve is sleeved on the fixed insulating sleeve. The movable insulating sleeve can slide along the metal cutter handle until the metal cutter head is contracted in the movable insulating sleeve or the metal cutter head extends out of the movable insulating sleeve. Therefore, the arrangement of the insulation protection structure effectively improves the use safety of the electric screwdriver.

Description

Screwdriver for electric power

Technical Field

The invention relates to the technical field of hardware tools, in particular to a screwdriver for electric power.

Background

A screwdriver is a tool used to turn a screw to force it into place, usually consisting of a thin wedge-shaped head that can be inserted into a slot or recess in the head of the screw, mainly in the form of a straight (minus) and a cross (plus), and also a hexagonal screwdriver, both internal and external hexagonal. In a power system, a live operation is often required, so that a screwdriver used in the power system is usually provided with an insulating structure at a position where a metal handle is close to a handle.

However, in the screwdriver having the insulating structure, there is a high possibility that the metal shank or the metal bit may collide with a different terminal or a different wire in the vicinity to cause a short circuit when the live wire is connected or disconnected. Therefore, the safety performance of the conventional electric power screwdriver is not high.

Disclosure of Invention

Accordingly, it is necessary to provide a power screwdriver which can improve the safety of use in view of the problem that the conventional screwdriver is not high in safety.

An electric screwdriver comprising:

an insulated handle;

one end of the metal knife handle is arranged on the insulating handle, and the other end of the metal knife handle is provided with a metal knife head;

and

insulating protective structure includes:

the fixed insulating sleeve is sleeved at one end, close to the insulating handle, of the metal handle, and the length of the fixed insulating sleeve is smaller than or equal to that of the metal handle;

the movable insulating sleeve is sleeved on the fixed insulating sleeve and can operatively slide along the metal cutter handle until the metal cutter head is contracted in the movable insulating sleeve or the metal cutter head extends out of the movable insulating sleeve.

In one embodiment, the fixed insulating sleeve is an insulating layer attached to the outer surface of the metal rod.

In one embodiment, the movable insulating sleeve is a polycarbonate sleeve.

In one embodiment, the insulation protection structure further comprises a limiting collar formed at one end, far away from the insulation handle, of the fixed insulation sleeve, a limiting step is formed on the inner wall of the movable insulation sleeve, and the movable insulation sleeve can slide along a direction back to the insulation handle until the limiting step abuts against the limiting collar.

In one embodiment, the limiting ring is sleeved and fixed at one end of the fixed insulating sleeve close to the metal cutter head.

In one embodiment, the fixed insulating sleeve and the movable insulating sleeve are both elastic rubber structures, and the limiting lantern ring is an elastic rubber ring.

In one embodiment, a limiting groove is circumferentially formed in the inner wall of the movable insulating sleeve, which is close to one end of the insulating handle, a limiting protrusion is arranged on the outer wall of the fixed insulating sleeve, and the movable insulating sleeve slides along the metal handle so that the limiting groove and the limiting protrusion can be clamped.

In one embodiment, the outer wall of the fixed insulating sleeve is provided with a plurality of limiting protrusions arranged at intervals in the extending direction, and the movable insulating sleeve slides along the metal tool handle, so that the limiting groove can be clamped with any one of the limiting protrusions.

In one embodiment, the outer surface of the insulated handle is provided with anti-skid ribs along the extension direction of the insulated handle.

In one embodiment, the metal shank is removably coupled to the insulated handle.

When the screwdriver for electric power is used, the metal screwdriver head can be contracted in the insulating sleeve or extend out of the insulating sleeve by adjusting the position of the movable insulating sleeve. When the movable insulating sleeve slides along the direction from the metal tool bit to the insulating handle until the metal tool bit extends out of the movable insulating sleeve, the electric screwdriver can be used as a common screwdriver. If the operations of live wiring or live disconnection and the like are needed, the movable insulating sleeve can slide along the direction of the insulating handle pointing to the metal tool bit until the metal tool bit is contracted in the insulating sleeve, so that the condition that the metal tool bit or the metal tool shank is mistakenly collided with other leads or terminals to cause short circuit and the like in the process of live wiring or disconnection is avoided. Therefore, the arrangement of the insulation protection structure effectively improves the use safety of the electric screwdriver.

Drawings

Fig. 1 is a schematic view illustrating a state in which a metal cutter is retracted into a movable insulating sleeve in a screwdriver according to a preferred embodiment of the present invention;

fig. 2 is a sectional view of the electric power screwdriver of fig. 1;

FIG. 3 is a schematic view of the electric screwdriver of the preferred embodiment of the present invention extending out of the movable insulating sheath;

fig. 4 is a sectional view of the electric power screwdriver of fig. 3;

fig. 5 is a sectional view of a movable insulating sleeve of the screwdriver for electric power shown in fig. 1 and 3;

fig. 6 is a sectional view of a fixing insulating sleeve of the screwdriver for electric power shown in fig. 1 and 3.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a screwdriver 100 for electric power in accordance with a preferred embodiment of the present invention includes an insulating handle 110, a metal shank 120 in a rod shape, a metal tool bit 130, and an insulating protection structure 140.

The insulated handle 110 mainly serves for insulation and hand holding. During the use of the screwdriver 100, the operator needs to grip the insulating handle 110 to perform operations such as wiring and disconnecting. The insulated handle 110 may be a unitary structure made of one material or a split structure made of at least two materials. When the insulated handle 110 is of an integral structure, the insulated handle 110 is usually made of a material with high resistivity, such as rubber, wood, plastic, or ceramic. When the insulated handle 110 is a split structure, the insulated handle 110 is composed of a body and an insulating layer wrapped on the outer surface of the body. The main body mainly plays a supporting role and is usually made of stainless steel, cast steel, alloy steel, rubber, wood and other materials with high strength.

In the present embodiment, the outer surface of the insulated handle 110 is provided with an anti-slip ridge 111 along the extending direction. During the use of the screwdriver 100, the insulating handle 110 needs to be held by hand and the screwdriver 100 needs to be continuously screwed. Therefore, the arrangement of the anti-slip ribs 111 can effectively increase the friction force between the insulated handle 110 and the human hand, so as to reduce the probability of slipping between the human hand and the insulated handle 110 during the use of the screwdriver 100, thereby effectively improving the reliability of the screwdriver 100.

The metal shank 120 has a rod shape. One end of the metal handle 120 is mounted on the insulated handle 110, and the other end is formed with a metal bit 130.

The metal handle 120 mainly plays a supporting role and is generally made of high-carbon steel, chrome vanadium steel, chrome molybdenum steel and other materials with high strength and good impact resistance. The radial cross-sectional shape of the metal tool shank 120 may be rectangular, circular, triangular, oval, irregular, etc.

In this embodiment, one end of metal shank 120 is removably coupled to one end of insulated handle 110. Therefore, after the electric screwdriver 100 is used for a long time, the situation that the insulating handle 110 or the metal handle 120 is damaged and needs to be replaced inevitably occurs, and at the moment, the metal handle 120 and the insulating handle 110 are set to be in a detachable connection mode, so that the metal handle 120 and the insulating handle 110 are more convenient to disassemble and assemble, and further the maintenance and the part replacement of the electric screwdriver 100 are more convenient.

Moreover, in practical application, in order to be convenient to use and store, one insulating handle 110 may be provided with a plurality of different metal tool shanks 120, each metal tool shank 120 is connected with the metal tool bits 130 of different specifications and sizes, and when in use, only the metal tool bit 130 of a proper specification needs to be selected according to actual needs, and the corresponding metal tool shank 120 is mounted on the insulating handle 110. Therefore, the metal shank 120 and the insulating handle 110 are detachably connected, which not only reduces the processing cost of the screwdriver 100 for electric power, but also facilitates the use of the screwdriver 100 for electric power.

Further, in the present embodiment, a threaded hole (not shown) is opened in an end surface of the insulated handle 110 facing one end of the metal shank 120. One end of the metal shank 120 is screwed into the threaded hole. Specifically, a threaded rod (not shown) is formed at one end of the metal handle 120 close to the insulated handle 110, and the threaded rod is screwed in the threaded hole. Therefore, in the process of assembling and disassembling the insulated handle 110 and the metal handle 120, only the metal handle 120 needs to be screwed, and the assembling and disassembling work of the insulated handle 110 and the metal handle 120 can be completed. Therefore, the insulating handle 110 is screwed into the threaded hole, so that the metal handle 120 and the insulating handle 110 can be more conveniently assembled and disassembled.

The metal cutting head 130 is primarily used to insert into a slot or recess of the screw head to facilitate turning and seating the screw. The metal tool bit 130 may be fixedly connected to the metal tool handle 120 by means of screwing, clamping, welding, or the like, or may be formed as an integrally formed structure with the metal tool handle 120 by casting or the like. Generally, the metal chip 130 is made of the same material as the metal holder 120. Specifically, the metal tool bit 130 includes a straight line, a cross, a T-shape (plum blossom shape), an H-shape (hexagonal shape), and the like.

In the present embodiment, the metal cutting head 130 and the metal tool shank 120 are formed as an integral structure. The integral molding is a one-time molding process. The metal tool tip 130 and the metal tool shank 120 are integrally formed, so that the metal tool tip 130 and the metal tool shank 120 are connected more firmly, and the electric screwdriver 100 is simpler to process.

The insulation protection structure 140 includes a fixed insulation sheath 141 and a movable insulation sheath 142.

The fixed insulating sleeve 141 is sleeved on one end of the metal handle 120 close to the insulating handle 110. The length of the fixed insulating sleeve 141 is less than or equal to the length of the metal tool shank 120. Therefore, the metal tool shank 120 may be entirely wrapped in the fixed insulating sheath 141, or only a portion near one end of the insulating handle 110 may be wrapped in the fixed insulating sheath 141. Specifically, the fixed insulating sleeve 141 may be an insulating layer attached to the outer surface of the metal handle 120, or an insulating sleeve that is sleeved and fixed on the metal handle 120 by bonding, pressing, or the like. The insulating sleeve 141 is fixed, so that the metal handle 120 can be prevented from directly contacting other guides or terminals in the operations of live wiring, live disconnection and the like of the screwdriver 100, the risks of short circuit and the like can be avoided, and the use safety of the screwdriver 100 can be improved.

In this embodiment, the fixed insulating sleeve 141 is an insulating layer attached to the outer surface of the metal tool shank 120. Specifically, the fixed insulating sleeve 141 is formed by wrapping a liquid insulating material on the outer surface of the metal tool shank 120, and after the liquid insulating material is cooled and solidified, an insulating layer (i.e., the fixed insulating sleeve 141) wrapped on the outer surface of the metal tool shank 120 can be formed. Therefore, the fixed insulating sleeve 141 is provided as an insulating layer laid on the outer surface of the metal handle 120, so that the connection between the fixed insulating sleeve 141 and the metal handle 120 is firmer, the looseness, the sliding and other situations of the fixed insulating sleeve 141 relative to the metal handle 120 are greatly reduced, and the reliability of the screwdriver 100 for electric power is effectively improved.

Referring to fig. 3 and 4, the movable insulating sleeve 142 is sleeved on the fixed insulating sleeve 141. Generally, the movable insulating sheath 142 and the fixed insulating sheath 141 are made of the same material. The movable insulation sleeve 142 is operable to slide along the metal tool shank 120 until the metal tool tip 130 is retracted within the movable insulation sleeve 142 or the metal tool tip 130 protrudes out of the movable insulation sleeve 142. Therefore, by adjusting the position of the movable insulating sleeve 142 on the fixed insulating sleeve 141, the metal tool bit 130 can be retracted into the movable insulating sleeve 142 or extended out of the movable insulating sleeve 142.

Specifically, when the metal cutting head 130 is retracted into the movable insulation sleeve 142, the positional relationship of the metal cutting head 130 includes the following two conditions: in the first condition, the end surface of the metal tool bit 130 away from the metal tool shank 120 is flush with the end surface of the movable insulating sleeve 142 away from the insulating handle 110; in the second case, the end surface of the metal tool tip 130 away from the metal tool shank 120 is located between the end surfaces of the two opposite ends of the movable insulating sleeve 142.

Further, when the movable insulating sleeve 142 slides along the metal tool shank 120 until the metal tool bit 130 extends out of the movable insulating sleeve 142, the electric power screwdriver 100 can be used as a common screwdriver in an uncharged environment; when the movable insulating sleeve 142 slides along the metal tool shank 120 until the metal tool bit 130 is retracted into the movable insulating sleeve 142, the screwdriver 100 can be used in a live environment. Therefore, the movable insulating sleeve 142 is slidably fitted over the fixed insulating sleeve 141, so that the screwdriver is more convenient to use.

Referring to fig. 5 and fig. 6, in the present embodiment, a limiting groove 1421 is formed on an inner wall of the movable insulating sleeve 142 near one end of the insulating handle 110 along a circumferential direction. The fixed insulating sleeve 141 slides along the metal tool shank 120, so that the limiting groove 1421 and the limiting protrusion 1411 can be clamped.

In one embodiment, the limiting protrusions 1411 are all provided in plurality, and the limiting protrusions 1411 are arranged at intervals along the circumference of the fixed insulating sleeve 141. The movable insulating sleeve 142 slides along the metal handle 120, so that the limiting groove 1421 and the plurality of limiting protrusions 1411 can be clamped. Therefore, the arrangement of the plurality of limiting protrusions 1411 effectively improves the limiting effect of the movable insulating sleeve 142 on the fixed insulating sleeve 141. .

Therefore, when the movable insulating sleeve 142 slides along the metal handle 120 until the metal tool bit 130 extends out of the movable insulating sleeve 142, the limiting protrusion 1411 is clamped in the limiting groove 1421 to limit the position of the movable insulating sleeve 142 on the fixed insulating sleeve 141. Therefore, the arrangement of the limiting groove 1421 and the limiting protrusion 1411 enables the metal bit 130 to extend out of the movable insulating sleeve 142, so that when the screwdriver 100 is used as a common screwdriver, the situation that the movable insulating sleeve 142 slides relative to the fixed insulating sleeve 141 under the action of gravity can be avoided, and the convenience in use of the screwdriver 100 is further improved.

In another embodiment, the outer wall of the fixed insulating sleeve 141 is provided with a plurality of limiting protrusions 1411 arranged at intervals in the extending direction. The movable insulating sleeve 142 slides along the metal handle 120, so that the limiting groove 1421 can be clamped with any one of the limiting protrusions 1411. Therefore, in the actual use process, the length of the metal cutter head 130 extending out of the movable insulating sleeve 142 can be determined according to the use environment. The plurality of limiting protrusions 1411 spaced apart from each other along the extending direction of the fixed insulating sleeve 141 can adjust the length of the metal bit 130 extending out of the movable insulating sleeve 142, so that the screwdriver 100 for electric power can be used more conveniently.

Referring to fig. 2, fig. 4 and fig. 5 again, in the present embodiment, the insulation protection structure 140 further includes a limiting collar 143 formed at an end of the fixed insulation sleeve 141 away from the insulation handle 110. The movable insulating sleeve 142 is formed with a stopper step 1422 in an annual ratio. The movable insulating sleeve 142 can slide along the direction back to the insulating handle 110 until the limit step 1422 abuts against the limit collar 143. Thus, the stopper 1422 is annular. The position limiting collar 143 may be a ring structure made of aluminum, stainless steel, rubber, plastic, etc.

Specifically, when the movable insulating sleeve 142 slides along the insulating handle 110 in the direction pointing to the metal tool bit 130 until the metal tool bit 130 is retracted into the movable insulating sleeve 142, the end of the limiting step 1422 facing one end of the metal tool bit 130 abuts against the limiting collar 143; when the movable insulating sleeve 142 slides along the direction of the metal tool bit 130 toward the insulating handle 110 until the metal tool bit 130 extends out of the movable insulating sleeve 142, the position-limiting collar 143 does not contact the position-limiting step 1422.

Therefore, when the metal tool bit 130 is retracted into the movable insulating sleeve 142, the limiting collar 143 abuts against the limiting step 1422, so that the situation that the movable insulating sleeve 142 slides excessively towards the metal tool bit 130 can be avoided, and the situation that the movable insulating sleeve 142 slides excessively to slide out of the metal tool bit 130 can be avoided, and the movable insulating sleeve 142 slides excessively to cause the situation that the movable insulating sleeve 142 slides out of the metal tool bit 130, even the movable insulating sleeve 142 slides out of the metal tool shank 120, so that the use of the screwdriver 100 for electric power is affected. Therefore, the limit collar 143 is engaged with the limit step 1422, which effectively improves the reliability of the electric power screwdriver 100.

Specifically, in this embodiment, when the movable insulating sleeve 142 is provided with the limiting step 1422 therein, the limiting groove 1421 is opened on the inner wall of the limiting step 1422.

Further, in this embodiment, the position-limiting ring 143 is sleeved and fixed on one end of the fixed insulating sleeve 141 close to the metal cutter 130. Therefore, the position of the limiting collar 143 is closer to the metal tool bit 130, so that the metal tool bit 130 can be contracted in the movable insulating sleeve 142 only by the movable insulating sleeve 142 which is shorter, the movable insulating sleeve 142 can be manufactured by using less materials, the processing cost of the movable insulating sleeve 142 is greatly reduced, and the processing cost of the electric screwdriver 100 is lower.

Further, in this embodiment, the position limiting sleeve 143 is an elastic rubber ring. Since the elastic rubber has a reversible deformation characteristic, in the manufacturing process of the screwdriver 100 for electric power, the position-limiting sleeve 143 is spread and sleeved on the fixed insulating sleeve 141, and then the position-limiting sleeve is released to return to the original position, so as to clamp the fixed insulating sleeve 141 in the position-limiting sleeve 143. Therefore, the check collar 143 is provided as an elastic rubber ring, so that the mounting work of the check collar 143 is simpler.

The fixed insulating sleeve 141 and the movable insulating sleeve 142 are both of rubber structures. Therefore, the fixed insulating sleeve 141, the movable insulating sleeve 142 and the position limiting sleeve ring 143 are made of the same material, so that the friction force between the movable insulating sleeve 142 and the position limiting sleeve ring 143 is smaller relative to the fixed insulating sleeve 141, and the probability of abrasion of the movable insulating sleeve 142 and the position limiting sleeve ring 143 is effectively reduced. Therefore, the materials of the fixed insulating sleeve 141, the movable insulating sleeve 142 and the position limiting sleeve 143 are all made of rubber, so that the service lives of the fixed insulating sleeve 141, the movable insulating sleeve 142 and the position limiting sleeve 143 are effectively prolonged, and the service life of the screwdriver 100 for electric power is further prolonged.

In another embodiment, the movable insulating sleeve 142 is a polycarbonate sleeve. Polycarbonate, abbreviated as PC, has the characteristics of high transparency, excellent electrical insulation performance, good weather resistance, etc., so the movable insulating sleeve 142 also has the advantages of high light transmittance, excellent electrical insulation performance, good weather resistance, etc.

And the movable insulating sleeve 142 is transparent due to high light transmittance, so that even if the metal bit 130 is shrunk in the movable insulating sleeve 142, an operator can still see the condition of the metal bit 130 in the movable insulating sleeve 142, so that the operator can observe the working condition of the metal bit 130 in real time in the working process of using the screwdriver 100 for electric power, and the screwdriver 100 for electric power is more convenient to use. And the good weather resistance makes the movable insulating sleeve 142 have a longer service life, thereby effectively prolonging the service life of the screwdriver 100 for electric power.

When the screwdriver 100 for electric power is needed to perform operations such as live connection or live disconnection, the movable insulating tool bit is slid along the direction of the insulating handle 110 pointing to the metal tool bit 130 until the metal tool bit 130 is retracted into the movable insulating sleeve 142, so as to avoid the risk of short circuit and the like caused by the mistaken collision of the metal tool bit 130 or the metal tool holder 120 with other wires or terminals in the process of live connection or live disconnection. Therefore, the fixed insulating sleeve 141 and the movable insulating sleeve 142 are mutually matched, so that the situation that other wires or terminals are directly contacted with the metal tool bit 130 and the metal tool shank 120 directly in the live operation process of the screwdriver 100 for electric power, and a circuit is short-circuited can be avoided. Therefore, the installation of the insulation protection structure 140 effectively improves the safety of the electric screwdriver 100.

When the screwdriver 100 for electric power is used, the metal bit 130 can be retracted into or extended out of the insulation sleeve by adjusting the position of the movable insulation sleeve 142. When the movable insulation sleeve 142 slides along the metal bit 130 toward the insulation handle 110 until the metal bit 130 protrudes out of the movable insulation sleeve 142, the screwdriver 100 can be used as a common screwdriver. If the operation such as live connection or live disconnection is required, the movable insulating sleeve 142 can slide along the insulating handle 110 in the direction pointing to the metal tool bit 130 until the metal tool bit 130 is retracted into the insulating sleeve, so as to avoid the risk of short circuit and the like caused by the mistaken collision of the metal tool bit 130 or the metal tool holder 120 with other wires or terminals in the process of live connection or disconnection. Therefore, the installation of the insulation protection structure 140 effectively improves the safety of the electric screwdriver 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An electric screwdriver, comprising:

an insulated handle;

one end of the metal knife handle is arranged on the insulating handle, and the other end of the metal knife handle is provided with a metal knife head; and

insulating protective structure includes:

2. The screwdriver as defined in claim 1, wherein said stationary insulating sleeve is an insulating layer attached to an outer surface of said metal rod.

3. The screwdriver as recited in claim 1 wherein said movable insulating sleeve is a polycarbonate sleeve.

4. The screwdriver as claimed in claim 1, wherein the insulation protection structure further comprises a stop collar formed at an end of the fixed insulation sleeve away from the insulation handle, a stop step is formed on an inner wall of the movable insulation sleeve, and the movable insulation sleeve is slidable along a direction back to the insulation handle until the stop step abuts against the stop collar.

5. The screwdriver as claimed in claim 4, wherein the collar is fixed to the fixed insulating sleeve at an end thereof adjacent to the metal bit.

6. The screwdriver as claimed in claim 4, wherein the fixed insulating sleeve and the movable insulating sleeve are both elastic rubber structures, and the limiting collar is an elastic rubber ring.

7. The screwdriver as claimed in claim 1, wherein a limiting groove is circumferentially formed in an inner wall of the movable insulating sleeve near one end of the insulating handle, a limiting protrusion is formed on an outer wall of the fixed insulating sleeve, and the movable insulating sleeve slides along the metal handle, so that the limiting groove and the limiting protrusion can be clamped.

8. The screwdriver as claimed in claim 7, wherein the outer wall of the fixed insulating sleeve is provided with a plurality of limiting protrusions arranged at intervals in the extending direction, and the movable insulating sleeve slides along the metal shank, so that the limiting groove can be clamped with any one of the limiting protrusions.

9. The screwdriver as recited in claim 1, wherein the outer surface of said insulated handle is provided with anti-slip ribs along the extension direction of said insulated handle.

10. The electric screwdriver of claim 1, wherein said metal shank is removably connected to said insulated handle.