CN210282178U - Work head fixing mechanism and electric tool - Google Patents

Abstract

The utility model provides a work head fixed establishment and relevant electric tool, work head fixed establishment detachably fastens the work head on the output shaft, and fixed establishment includes: a body defining a main axis and an inner cavity disposed along the main axis; a working head holder at least partially disposed in the internal cavity; a coupling member disposed in the interior chamber and movable between first and second operative positions, the coupling member removably coupling the retaining member to the interior chamber, a biasing member biasing the coupling member to the first position; and a fastening mechanism that can lock the holder at a plurality of different axial positions along the main shaft; the retaining member is assembled and disassembled along the spindle, the retaining member and the connecting member are detachably configured by a fastening mechanism, the fastening mechanism maintains the retaining member and the connecting member in a locked position when the connecting member is in the first position, and the fastening mechanism is moved to a release position to release the retaining member when the connecting member is in the second position, while allowing the retaining member to be directly axially disassembled. The utility model has the advantages that the working heads with different thicknesses can be connected.

Description

Work head fixing mechanism and electric tool

Technical Field

The present invention relates to a fixing mechanism for a working head of an electric tool, and more particularly, to a fixing mechanism for a working head of a multifunctional electric tool.

Background

Electric tools, such as drills, saws, angle grinders, etc., have different working heads. These heads, such as drills, saw blades, grinding wheels, etc., are typically designed to be replaceable, with heads that have been adapted to different construction needs and that are susceptible to becoming dull or damaged.

Because of the large amount of heat generated by the operation of the power tool and the vibration generated by the movement of the motor, the working head of the power tool may be loosened from the clamp, and the accidental loosening of the working head may cause damage to the user, especially when the components of the power tool are in high-speed movement. Therefore, the mechanism for locking or fastening the working head usually needs to be fastened by using an additional tool such as a wrench, a screwdriver, etc. in cooperation with a specific bolt and a clamp, but a user may perform a working head mounting or dismounting process by using an improper wrench or screwdriver and damage the electric tool. Alternatively, the user may lose a particular work head replacement tool that is carried with the power tool and not replace or install the work head for the power tool.

SUMMERY OF THE UTILITY MODEL

Accordingly, embodiments of the present invention provide a new work head securing mechanism for an electric tool to overcome the above-mentioned problems.

In one aspect, the utility model provides a working head fixing mechanism for detachably fastens the working head on electric tool's output shaft, working head fixing mechanism includes:

a body defining a main axis and an interior cavity disposed along the main axis;

a working head holder at least partially disposed within the internal cavity;

the connecting piece is configured in the inner cavity and can move between a first working position and a second working position, and the connecting piece is detachably connected with the working head holding piece and the inner cavity;

a biasing member configured to bias the attachment member in the first operating position; and

a fastening mechanism that can lock the work head holder at a plurality of different axial positions along the spindle;

the working head holding piece can be assembled and disassembled along the main shaft, the working head holding piece and the connecting piece are detachably configured through the fastening mechanism, when the connecting piece is located at the first working position, the fastening mechanism keeps the connection between the working head holding piece and the connecting piece at a locking position, and when the connecting piece is located at the second working position, the fastening mechanism is moved to a releasing position to release the working head holding piece, and meanwhile, the working head holding piece can be directly and axially disassembled.

Preferably, the fastening mechanism is arranged on the connecting piece.

Preferably, the work head holder is configured to be completely separated from the main body to allow the work head to be mounted on the output shaft.

Preferably, the working head holding piece and the end part of the output shaft are provided with working head fastening structures which are matched with each other.

Preferably, at least a portion of the working head is clamped by the working head fastening structure.

Preferably, the work head fastening structure comprises an annular flange provided on the work head holder.

Preferably, the end of the output shaft is provided with an annular clamping portion which is engaged with the annular flange on the work head holder.

Preferably, the annular clamping portion has a working head fixing member configured to fix the working head.

Preferably, the work head fastening structure further comprises a work head adapter provided between the annular clamping portion and the work head holder, whereby the work head is clamped between the work head adapter and the work head holder.

Preferably, when the work head holder is locked to the connecting member, the end of the work head holder is fitted into the connecting member.

Preferably, the fastening mechanism includes an inner locking groove and an outer locking groove, the inner locking groove is provided on an inner surface of the connecting member and the outer locking groove is provided on an outer surface of the end portion of the working head holder.

Preferably, the inner locking groove is configured to move inwardly to the locking position and engage the outer locking groove when the attachment member is moved to the first working position, thereby lockingly connecting the work head holder to the attachment member.

Preferably, the inner locking groove comprises a plurality of grooves disposed along the inner surface of the connector, and the outer locking groove comprises a plurality of projections, at least a portion of the projections engaging the grooves.

Preferably, the connecting member comprises a pair of connecting portions acting relative to each other.

Preferably, the connecting member further comprises an elastic member radially disposed around an outer surface of the connecting portion.

Preferably, when the connecting member is moved to the second operating position, the connecting portion is configured to move outwardly to the release position and the resilient member extends at least partially radially from an outer surface of the connecting portion.

Preferably, the output shaft is tubular, and when the connecting member is located at the first working position, the inner surface of the output shaft drives the inner locking groove to move inwards and engage with the outer locking groove.

Preferably, the output shaft has a plurality of portions of different internal diameters to urge the connecting portion inwardly or to allow the connecting portion to move towards the inner surface of the connecting member when the connecting member moves within the tubular output shaft.

Preferably, the working head fixing mechanism further comprises a working head releasing mechanism configured to drive the connecting member to move to the second working position.

Preferably, the work head release mechanism has an eccentric abutting the attachment.

Preferably, the work head release mechanism further has a handle connected to the eccentric wheel.

Preferably, the working head is at least one of a blade, a saw blade, a sanding plate, a sanding disc and a polishing pad.

Preferably, the biasing member is biased against the attachment member.

In another aspect, the present invention provides an electric power tool having a motor, an output shaft configured to transmit power of the motor to a working head, and a working head fixing mechanism of the present invention.

Preferably, the power tool is a multi-function power tool.

The present invention provides a work head securing mechanism for an electric power tool that provides a number of advantages. One of the advantages is that by its simple and effective connecting/locking means, work heads of different thicknesses can be fastened to the output shaft, and that the securing means, including a strong (at least 700N or more) spring, is allowed to clamp the work head by the work head fastening means, so as to avoid problems of unexpected displacement of the work head and even accidental detachment of the work head, especially when the electric tool is in operation, which may generate a lot of heat and/or vibration affecting the clamping performance of the work head fastening means. The eccentric may be designed to be smaller in size to provide more space for the internal cavity of the head securing mechanism, for example, a stronger spring may be further included to more securely hold the working head. In addition, the working head fixing mechanism does not need to be operated by additional tools such as a wrench, a screwdriver and the like, and different components are also provided with magnets to provide temporary fixed connection for different installation parts in different installation or disassembly steps, so that the working head is greatly convenient for a user to carry out the working head installation, replacement and disassembly processes.

Drawings

A further understanding of the nature and advantages of the present invention may be realized by reference to the remaining portions of the specification and the drawings; the same components are numbered the same throughout the several views. In some cases, a sublabel is placed after a reference numeral and hyphen to denote one of many similar components. When a reference numeral is used to refer to a particular feature, but not necessarily any particular element, it is intended to refer to that feature.

Fig. 1 illustrates a side sectional view including a work head securing mechanism for an electric tool according to an embodiment of the present invention, in which a work head is fastened to an output shaft by a work head holder;

FIG. 2 illustrates another operational state of the work head holding mechanism shown in FIG. 1, in which the work head holder is pushed out;

FIG. 3 illustrates another operational state of the work head securing mechanism of FIG. 1, wherein the work head holder is disassembled and completely separated from the main body;

FIG. 4 illustrates another operational state of the work head securing mechanism of FIG. 1 wherein the work head retainer is inserted into the internal cavity and attracted by the magnetic attachment member of the attachment member;

FIG. 5 illustrates another operational state of the workhead securing mechanism shown in FIG. 1 wherein the attachment member is biased by the biasing member to the first operative position and lockingly engaged with the workhead retaining member;

FIG. 6A illustrates a partial cross-sectional view of the work head securing mechanism of FIG. 1 showing details of the fastening mechanism;

FIG. 6B shows a partial enlarged view of FIG. 7A;

FIG. 7A illustrates another operational state of the work head securing mechanism of FIG. 1 showing the work head holder clamped by a pair of half nuts;

FIG. 7B shows a partial enlarged view of FIG. 7A;

FIG. 8A illustrates another operational state of the work head securing mechanism of FIG. 1 showing a pair of half nuts moving radially toward the inner surface of the connecting member;

FIG. 8B shows a partial enlarged view of FIG. 8A;

FIG. 9A illustrates another operational state of the work head securing mechanism shown in FIG. 1, showing the work head retainer fully released by the pair of half nuts;

FIG. 9B shows a partial enlarged view of FIG. 9A;

FIG. 10A illustrates the operation of the work head securing mechanism and work head adapter of FIG. 1; and

FIG. 10B shows an enlarged view of the work head adapter shown in FIG. 10A.

Detailed Description

The embodiment of the utility model discloses an electric tool who has work head fixed establishment has been used, for example can connect the multi-functional electric tool of the work head of different thickness. Various other benefits and advantages provided by various embodiments of the present invention will be readily apparent from the following description.

Referring to fig. 1-10, the present invention provides a working head fixing mechanism 100 for detachably fastening a working head 128 on an output shaft 130 of an electric tool, the working head fixing mechanism 100 comprising: a body 116 defining a main axis and an internal cavity disposed along the main axis; a work head holder 126, the work head holder 126 being at least partially disposed within the internal cavity; the connecting piece 106 is arranged in the inner cavity and can move between a first working position and a second working position, and the connecting piece 106 is detachably connected with the working head holding piece 126 and the inner cavity; a biasing member 118, the biasing member 118 configured to bias the attachment member 106 in the first operating position; and a fastening mechanism 112, the fastening mechanism 112 being lockable in a plurality of different axial positions along the spindle for the work head holder 126. The work head holder 126 is attachable and detachable along the spindle, the work head holder 126 and the connecting member 106 are detachably configured by the fastening mechanism 112, when the connecting member 106 is in the first working position, the fastening mechanism 112 maintains the work head holder 126 and the connecting member 106 in a locked position, and when the connecting member 106 is in the second working position, the fastening mechanism 112 is moved to a released position to release the work head holder 126, while allowing the work head holder 126 to be directly axially detached.

The work head securing mechanism 100 may be used to secure a replaceable work head 128 to an output shaft 130, for example, the work head 128 may preferably be any one of a blade, a saw blade, a sanding plate, a sanding disc, and a polishing pad. The power tool may have a motor (not shown) and a suitable transmission 114 to transmit the power of the motor to the output shaft 130 and its associated working head 128. The power tool can be used as a multi-function power tool to meet the requirements of different operations (e.g., cutting, grinding, polishing, etc.).

As shown in FIG. 1, workhead securing mechanism 100 has a main body 116 to secure various components of workhead securing mechanism 100 within its internal cavity, including a preferably tubular output shaft 130, a coupling member 106 movable within the internal cavity, a biasing member 118 configured to bias coupling member 106, and a workhead holder 126 at least partially configured within the internal cavity. Preferably, the lumen is disposed along a major axis defined by the body 116, and the different components are disposed along the major axis in different portions of the lumen. In addition, the hollow portion of the tubular output shaft 130 may accommodate a spring 118 serving as a biasing member, and a workhead holder 126 for holding the workhead 128, and the output shaft 130, the spring 118, and the workhead holder 126 are preferably coaxially arranged.

The work head holder 126 preferably has a long rod 126A of similar length to the output shaft 130 and an annular flange 126B provided at its end. Referring to fig. 1-2, the annular flange 126B may cooperate with an annular clamping portion 124 provided at an end of the output shaft 130 to form a working head fastening structure for clamping the working head 128 or a portion of the working head 128. The annular clamping portion 124 may be fixedly coupled to an end of the output shaft 130, or may be integrally formed on a surface of the end, thereby transferring motion received by the output shaft 130 to the working head 128 through the working head fastening structure. The cross-sectional shape of the other end of the elongated rod 126A fits into the hollow of the attachment member 106 so that the end of the elongated rod 126A fits over the hollow of the attachment member 106 and locks the work head holder 126 to the attachment member 106 via the fastening mechanism. In addition, the surface of the end portion of the working head holder 126 that is telescoped into the attachment member 106 is provided with an external locking groove 115B for engaging the lock body on the attachment member 106.

As shown in FIG. 1, the work head holder 126 and the connecting member 106 are detachably disposed by the fastening mechanism 112 disposed on the connecting member 106, so that the work head holder 126 can be assembled and disassembled along the spindle to fasten the work head 128 to the work head holding mechanism 100 and to detach the work head 128 from the work head holding mechanism 100. Preferably, the fastening mechanism 112 includes an inner locking groove 115A provided on the inner surface of the connecting member 106 and an outer locking groove 115B provided on the outer surface on the end of the head holder 126. For example, the connecting member 106 includes a pair of connecting portions 112A,112B acting relative to each other, such as a pair of half nuts, and an elastic member 113, such as a C-spring, provided along an outer surface of the half nuts 112A, 112B. A C-spring 113 extends at least partially radially from the outer surface of the connecting portions 112A, 112B.

For example, half nuts 112A,112B have an internal locking groove 115A along their inner surfaces that includes a plurality of grooves. The outer locking slot 115B on the long rod 126A may include a plurality of projections at least a portion of which are adapted to mate with a plurality of recesses of the inner locking slot 115A in the half nuts 112A, 112B. The connection member 106 locks the workhead holder 126 in a plurality of different axial positions along the spindle by the engagement between the partial protrusion of the outer locking groove 115B in its axial position and the groove of the inner locking groove 115A. Or the fastening mechanism 112 may include different shaped or configured slots, pegs, needles, snaps, etc.

The operation of the fastening mechanism 112 may include: when the attachment 106 is in the first operating position as shown in FIGS. 1, 5, 6A or 7A, the securing mechanism 112 maintains the work head holder 126 attached to the attachment 106 in the locked position, and when the attachment 106 is in the second operating position as shown in FIGS. 2-4, 8A or 9A, the securing mechanism 112 is moved to the release position to release the work head holder 126, allowing the work head holder 126 to be directly axially removed. The half nuts 112A,112B on the attachment member 106 are moved radially inward or outward in response to movement of the attachment member 106 to different operating positions so that their inner locking slots 115A engage the outer locking slots 115B on the rod 126A and lock or release the work head retainer 126 that is telescoped into the attachment member 106.

Optionally, the annular clamp 124 also has a work head fixture 122 configured to secure the work head 128. The working head fixture 122 is preferably a magnetically attractive member or magnet that can be used to at least temporarily attach a working head 128 to the end of an annular clamp 124 or output shaft 130. As shown in fig. 2-3, when the working head holder 126 is pushed out, the working head 128 is still attracted by the magnetic attraction member 122 disposed on the annular clamping portion 124, so as to prevent the working head 128 from separating from the annular clamping portion 124 due to the attraction force, thereby facilitating the working head installation, replacement or detachment process of the user.

In addition, the work head securing mechanism 100 has a work head release mechanism that includes an eccentric 104 and a handle 102 coupled to the eccentric 104. As shown, the eccentric 104 is rotatably disposed above the connecting member 106 and abuts the connecting member 106, whereby a user can rotate the eccentric 104 using the handle 102 and (downwardly) move the connecting member 106 to the second working position to push the head holder 126 downwardly. Since the connecting member 106 is constantly biased by the spring 118 toward its first working position (up), when the user rotates the eccentric 104 in the opposite direction by using the handle 102, the connecting member 106 returns to the first working position (up), thereby moving the working head holder 126 upward relative to the output shaft 130, and clamping the working head 128 with the annular clamping portion 124.

Referring to fig. 1 to 3, the working head fixing mechanism 100 according to an embodiment of the present invention may be operated by a user in the following steps. When the tool bit 128 is gripped by the bit holding mechanism 100 as shown in fig. 1, the user can actuate the power tool to perform work. The output shaft 130 is fixedly coupled to the transmission assembly 114 and is secured within the interior cavity of the body 116 by the bearings 110, 120. The transmission assembly 114 may be configured to transmit a vibration force and/or a reciprocating motion with a certain amplitude/angle to the output shaft 130, and when the motor is energized, the reciprocating motion is transmitted to the working head 128 fixed to the end of the output shaft 130 to perform an operation such as cutting, grinding, polishing, etc. on a construction object. In the state shown in fig. 7A and 7B, the connection member 106 is in the locked position and the inner locking groove 115A engages the outer locking groove 115B on the work head holder 126, thereby lockingly connecting the work head holder 126 to the connection member 106.

When the user needs to replace or remove the working head 128, the handle 102 can be pulled to the right as shown in fig. 7A to rotate the eccentric 104 and drive the connecting member 106 to move to the second working position, and the working head fixing mechanism 100 is in the state shown in fig. 8A and 8B. Because the tubular output shaft 130 has a plurality of portions with different inner diameters, the larger inner diameter of the output shaft 130 allows the half nuts 112A,112B to move outwardly to the release position when the connecting member 106 moves within the output shaft 130 to the second operating position. The resilient member 113 extends at least partially radially from the outer surface of the half nuts 112A,112B when the half nuts 112A,112B are moved radially outward. The locking members 112A,112B on the connector 106 are movable at least partially toward the inner surface of the connector 106 while disengaging the external locking grooves 115B on the head retainer 126, leaving the head securing mechanism 100 in the condition shown in FIGS. 9A and 9B. At this point, the work head securing structure defines about a 1.5mm spacing for the user to grasp the annular flange 126B on the work head holder 126 with a fingertip or suitable tool.

As shown in FIG. 3, the work head holder 126 may be removed from the interior cavity of the work head securing mechanism 100 by a user and completely separated from the main body 116 of the work head securing mechanism 100. Although the working head 128 is no longer clamped by the working head fastening structure, the working head is still attracted to the annular clamping portion 124 of the output shaft 130 under the magnetic attraction of the working head fixing member 122, so as to prevent the working head 128 from being displaced or separated from the output shaft 130 by the attraction force to cause accidents or damage to the working head.

At this point, the user may remove the original working head 128. If the user needs to reinstall the working head for construction, the user can first attach the tool head 128 to the end of the output shaft 130 by using the magnet 122 on the annular clamping portion 124, insert the working head holder 126 into the inner cavity and temporarily fix the working head holder to form the state shown in fig. 2, and then the user can pull the handle 102 and rotate the eccentric wheel 104 to the left as shown in the figure. Under the bias of the spring 118, the linkage 106 moves from the second operating position to the first operating position, causing the work head holder 126 to move upward and clamp the work head 128 with the work head securing structure. While the half nuts 112A,112B in the connection member 106 are urged by the inner surface of the portion of the output shaft 130 having the smaller inner diameter to move radially inwardly to the locked position and engage the outer locking grooves 115B of the workhead holders 126, thereby lockingly connecting the workhead holders 126 to the connection member 106 and returning to the working condition shown in fig. 1.

Alternatively, if the user has completed the work, the user may insert the work head holder 126 into the inner cavity and fix it to the connecting member 106 by not mounting the work head as shown in fig. 4-5, and then pull the handle 102 to lock the work head holder 126 into the inner cavity of the work head fixing mechanism 100.

Advantageously, the present invention of the work head securing mechanism 100 is applicable to work heads 128 having different thicknesses. Because the work head holder 126 has an outer lock groove 115B of a certain axial length along its end portion, the work head holder 126 can lock the work head holder 126 at a plurality of different axial positions along the spindle depending on the thickness of the work head 128 to be gripped without adjusting the stroke of the handle 102.

Preferably, even if the thickness of the working head 128 is thinner than the range of thickness that the working head holder 126 can hold, in order to make the working head fixing mechanism 100 of the present invention, the working head fastening structure further includes a working head adapter 200. As shown in FIG. 10, the work head adapter 200 is disposed between the annular clamp 124 and the work head holder 126. Thus, the work head 128 is clamped between the work head adapter 200 and the work head holder 126.

Thus, having described several embodiments, it will be recognized by those of skill in the art that various modifications, additional structures, and equivalents may be used without departing from the spirit of the invention. Accordingly, the above description should not be taken as limiting the scope of the invention, which is defined by the claims of the present application.

Claims (25)

1. A work head securing mechanism (100) for removably securing a work head (128) to an output shaft (130) of an electric power tool, the work head securing mechanism (100) comprising:

a body (116) defining a main axis and an internal cavity disposed along the main axis;

a work head holder (126), the work head holder (126) being at least partially disposed within the internal cavity;

the connecting piece (106) is arranged in the inner cavity and can move between a first working position and a second working position, and the connecting piece (106) is detachably connected with the working head holding piece (126) and the inner cavity;

a biasing member (118), the biasing member (118) configured to bias the attachment member (106) in the first operating position; and

a fastening mechanism (112), said fastening mechanism (112) being lockable in a plurality of different axial positions along said spindle for a work head holder (126);

the method is characterized in that: the work head holder (126) is attachable and detachable along the spindle, the work head holder (126) and the connecting member (106) are detachably configured by the fastening mechanism (112), the fastening mechanism (112) maintains the work head holder (126) in connection with the connecting member (106) in a locked position when the connecting member (106) is in the first working position, and the fastening mechanism (112) is moved to a released position to release the work head holder (126) when the connecting member (106) is in the second working position, while allowing the work head holder (126) to be directly axially detachable.

2. The work head securing mechanism (100) according to claim 1, characterized in that: the fastening mechanism (112) is arranged on the connecting piece (106).

3. The work head securing mechanism (100) according to claim 1, characterized in that: the working head holder (126) is configured to be fully separated from the main body (116) to allow the working head (128) to be mounted to the output shaft (130).

4. The work head securing mechanism (100) according to claim 1, characterized in that: the end parts of the working head holding piece (126) and the output shaft (130) are provided with working head fastening structures which are matched with each other.

5. The work head securing mechanism (100) according to claim 4, characterized in that: at least a portion of the working head (128) is clamped by the working head fastening structure.

6. The work head securing mechanism (100) according to claim 4, characterized in that: the working head fastening structure comprises an annular flange (126B) arranged on the working head holder (126).

7. The work head securing mechanism (100) according to claim 6, characterized in that: the end part of the output shaft (130) is provided with an annular clamping part (124), and the annular clamping part (124) is matched with the annular flange (126B) on the working head holding piece (126).

8. The work head securing mechanism (100) according to claim 7, characterized in that: the annular clamping portion (124) has a work head securing member (122), the work head securing member (122) being configured to secure the work head (128).

9. The work head securing mechanism (100) according to claim 8, wherein: the work head fastening structure further comprises a work head adapter (200), the work head adapter (200) being disposed between the annular clamping portion (124) and the work head holder (126), whereby the work head (128) is clamped between the work head adapter (200) and the work head holder (126).

10. The work head securing mechanism (100) according to claim 1, characterized in that: when the work head holder (126) is locked on the connecting piece (106), the end part of the work head holder (126) is sleeved in the connecting piece (106).

11. The work head securing mechanism (100) according to claim 10, wherein: the fastening mechanism (112) includes an inner locking groove (115A) and an outer locking groove (115B), the inner locking groove (115A) is disposed on an inner surface of the connecting member (106) and the outer locking groove (115B) is disposed on an outer surface on the end of the working head holder (126).

12. The work head securing mechanism (100) according to claim 11, wherein: the inner locking groove (115A) is configured to move inwardly to the locked position and engage the outer locking groove (115B) when the attachment member (106) is moved to the first working position, thereby lockingly connecting the work head holder (126) to the attachment member (106).

13. The work head securing mechanism (100) according to claim 12, wherein: the inner locking groove (115A) comprises a plurality of grooves disposed along the inner surface of the connector (106), and the outer locking groove (115B) comprises a plurality of projections, at least a portion of the projections engaging the grooves.

14. The work head securing mechanism (100) according to claim 13, wherein: the connecting member (106) includes a pair of connecting portions (112A,112B) that act relative to each other.

15. The work head securing mechanism (100) according to claim 14, wherein: the connecting member (106) further comprises an elastic member (113) radially disposed around an outer surface of the connecting portion (112A, 112B).

16. The work head securing mechanism (100) according to claim 15, wherein: when the connecting member (106) is moved to the second operating position, the connecting portions (112A,112B) are configured to move outwardly to the release position and the resilient member (113) extends at least partially radially from an outer surface of the connecting portions (112A, 112B).

17. The work head securing mechanism (100) according to claim 16, wherein: the output shaft (130) is tubular, and when the connecting piece (106) is located at the first working position, the inner surface of the output shaft (130) drives the inner locking groove (115A) to move inwards and engage with the outer locking groove (115B).

18. The work head securing mechanism (100) according to claim 17, wherein: the output shaft (130) has a plurality of portions of different inner diameters to urge the connecting portions (112A,112B) inwardly or to allow the connecting portions (112A,112B) to move toward the inner surface of the connecting member (106) as the connecting member moves within the tubular output shaft (130).

19. The work head securing mechanism (100) according to claim 1, characterized in that: the work head securing mechanism also has a work head release mechanism configured to actuate the linkage (106) to move to the second working position.

20. The work head securing mechanism (100) according to claim 19, wherein: the work head release mechanism has an eccentric (104) abutting the link (106).

21. The work head securing mechanism (100) according to claim 20, wherein: the working head release mechanism further comprises a handle (102), and the handle (102) is connected with the eccentric wheel (104).

22. The work head securing mechanism (100) according to claim 1, characterized in that: the working head is at least one of a blade, a saw blade, a sanding plate, a sanding disc and a polishing pad.

23. The work head securing mechanism (100) according to claim 1, characterized in that: the biasing member (118) is biased against the attachment member (106).

24. An electric power tool characterized in that: having an electric motor, an output shaft (130) configured to transmit power of the electric motor to the working head (128), and a working head securing mechanism (100) according to any of claims 1-23.

25. The power tool of claim 24, wherein: the electric tool is a multifunctional electric tool.

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