CN111185828A

CN111185828A - Electric tool

Info

Publication number: CN111185828A
Application number: CN201811355472.3A
Authority: CN
Inventors: 吉绍山; 梅杰; 党亚洲
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2018-11-14
Filing date: 2018-11-14
Publication date: 2020-05-22
Anticipated expiration: 2038-11-14
Also published as: CN111185828B

Abstract

The invention discloses an electric tool, comprising: the device comprises a machine body assembly, a control module and a control module, wherein the machine body assembly comprises a machine shell, a motor and a main switch; the chassis assembly comprises a working bottom plate and a tensioning mechanism; a control member configured to allow the work bottom plate to be separated from the tensioning mechanism in an open state and to lock the work bottom plate with the tensioning mechanism in a closed state; when the main switch is adjusted to the position for starting the motor, the main switch prevents the interlocking piece from moving, and the interlocking piece prevents the control piece from being switched to the open state; when the main switch is adjusted to the position for closing the motor, the control piece is switched to the opening state under the action of the elastic limiting piece; when the control piece is switched to the opening state, the elastic limiting piece prevents the main switch from being adjusted to the position for starting the motor. According to the electric tool provided by the embodiment of the invention, the main switch and the control piece cannot be simultaneously opened, so that the motor cannot be started when the working bottom plate is detached and replaced, and the damage of the motor is avoided.

Description

Electric tool

Technical Field

The invention relates to the technical field of tools, in particular to an electric tool.

Background

In the sanding machine in the related art, when a user replaces a working chassis or does not install the working chassis, a power switch can be turned on, so that the motor of the sanding machine is controlled to work, and the motor is easily damaged; moreover, in the using process, a user usually misunderstands the switch for replacing the working chassis as a power switch, so that the man-machine operation is not good, and the user experience is influenced. Thus, there is a need for improvement.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an electric tool, which has a main switch and a control member that cannot be turned on simultaneously, and which is highly reliable and safe to use.

According to an embodiment of the present invention, a power tool includes: the device comprises a machine body assembly and a control system, wherein the machine body assembly comprises a machine shell, a motor arranged in the machine shell and a main switch used for controlling the opening and closing of the motor; the chassis assembly comprises a working bottom plate and a tensioning mechanism, the working bottom plate is driven by the motor to rotate, and the tensioning mechanism is connected with the machine body assembly; a control mounted to the housing and switchable between an open state and a closed state, the control configured to allow the work bedplate to be separated from the tensioning mechanism in the open state and to lock the work bedplate with the tensioning mechanism in the closed state; when the main switch is adjusted to a position for starting the motor, the main switch abuts against the interlocking piece to prevent the interlocking piece from moving, and the interlocking piece is matched with the control piece to prevent the control piece from being switched to the open state; when the main switch is adjusted to a position for closing the motor, the interlocking piece is allowed to move, and when the interlocking piece is triggered to be disengaged from the control piece, the control piece is switched to the opening state under the action of the elastic limiting piece; when the control piece is switched to the opening state, the elastic limiting piece stops against the main switch to prevent the main switch from being adjusted to the position for starting the motor.

According to the electric tool provided by the embodiment of the invention, the interlocking piece and the elastic limiting piece are arranged, and the main switch is abutted against the interlocking piece when being adjusted to the position for starting the motor, so that the activity of the interlocking piece is limited, the control piece is limited in the closed state by the interlocking piece, and the control piece is prevented from being switched to the open state, so that a user cannot replace the working bottom plate; the control piece is switched to an open state, the main switch is stopped and abutted through the elastic limiting piece, so that the main switch is prevented from being adjusted to a position for starting the motor, a user cannot start the main switch to start the motor, the problem of motor burnout is prevented, and the damage of the whole electric tool is avoided. Therefore, the main switch and the control piece of the electric tool can not be opened simultaneously, the motor can not be opened when the working bottom plate is detached and replaced, the motor is prevented from being damaged, the working bottom plate can not be detached and replaced when the motor works, and the use reliability and the use safety of the electric tool are guaranteed.

According to one embodiment of the invention, the control element is in driving connection with the tensioning mechanism, and when the control element is in the open state, manipulation of the control element enables the tensioning mechanism to be disconnected from the work floor.

In some examples, the control member is formed in an elongated wrench shape, and one end of the control member is pivotably connected to the housing, and the other end of the control member is adapted to interlock with the interlocking member.

In some examples, the other end of the control member has a slot open at one side, and the interlocking member has the interlocking projection adapted to be inserted into the slot.

According to an alternative embodiment of the present invention, the elastic limiting member comprises: a plug movable in an initial opening direction of the control member; the elastic piece is arranged in the shell and connected with the ejector head, the elastic piece can deform along the moving direction of the ejector head, and when the control piece is switched to the closed state, the ejector head stops against one side, facing the shell, of the control piece under the action of the elastic piece; when the control piece is switched to the opening state, the ejector head stops against the main switch; when the main switch is adjusted to a position for closing the motor, the ejector jacks up the control piece under the action of the elastic piece when the interlocking piece is triggered to be disengaged from the control piece.

In some examples, a guide seat is arranged in the casing, the guide seat is provided with a guide groove, the top head is movably matched with the guide groove relatively, and the elastic piece is positioned between the top head and the elastic piece.

In some examples, the plug has a stopper groove opened toward the guide holder, and the elastic member is mounted in the stopper groove.

In some examples, the resilient member is a spring.

According to another alternative embodiment of the present invention, the elastic limiting member is elastically deformable and has a convex portion, when the control member is switched to the closed state, the convex portion is pressed by the control member to store potential energy, and when the control member is switched to the open state, a side portion of the convex portion abuts against the main switch; when the main switch is adjusted to a position for closing the motor and the interlocking piece is triggered to be disengaged from the control piece, the elastic limiting piece releases potential energy and jacks up the control piece through the convex part.

In some examples, the elastic limiting member includes an elastic support and a cover body covering an outer surface of the elastic support, and at least a portion of the cover body forms the convex portion.

In some examples, the resilient mount comprises: the first bracket extends towards the control part along the longitudinal direction, and a part of the cladding body is coated on the outer surface of the first bracket to form the convex part; the second support extends along the transverse direction, one end of the second support is connected with the first support, and the other end of the second support extends along the longitudinal direction towards the direction far away from the control piece and then extends along the transverse direction towards the first support.

Further, the elastic support further comprises: the third support extends along the transverse direction in an inclined mode, one end of the third support is connected with the first support, and the other end of the third support extends along the longitudinal direction in a direction far away from the control piece.

According to a further embodiment of the present invention, the main switch is movable between a position of turning on the motor and a position of turning off the motor, wherein a portion of the main switch adjacent to the interlocking member is provided with an interference portion for interfering with the interlocking member to prevent the interlocking member from moving.

In some examples, the interlock is rotatable about a fixed axis and has a lock knob for manual operation and an abutment cooperating with the abutment.

In some examples, the interlock comprises: a rotating portion rotatable about the fixed axis; one end of the first connecting arm is connected with the rotating part, and the other end of the first connecting arm is provided with the stopping part; and one end of the second connecting arm is connected with the rotating part, and the other end of the second connecting arm is provided with the locking button part.

In some examples, the housing has an interlock avoidance slot for avoiding the lock knob portion.

According to a further embodiment of the invention, the main switch comprises: a switch section for manual operation; the linkage piece is connected with the switch part to move together with the switch part, the abutting part is arranged on the linkage piece, the elastic limiting piece penetrates through the linkage piece to abut against the control piece when the control piece is switched to the closing position, and the elastic limiting piece abuts against the linkage piece to prevent the main switch from moving when the control piece is switched to the opening state.

In some examples, a side of the interference portion facing away from the interlock member in a moving direction of the main switch has a fitting groove adapted to be fitted with the interference portion.

In some examples, the control member has a switch avoidance groove for avoiding the switch section.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a power tool according to an embodiment of the present invention, wherein the wrench assembly is in a closed position;

FIG. 2 is an enlarged view of section A shown in FIG. 1;

FIG. 3 is a schematic structural view of a power tool according to an embodiment of the present invention, wherein the wrench assembly is in an open position;

fig. 4 is an enlarged view of a portion B shown in fig. 3;

FIG. 5 is a partial schematic view of a power tool according to another embodiment of the present invention;

fig. 6 is a partial structural schematic view of a power tool according to still another embodiment of the present invention.

Reference numerals:

in the case of the electric power tool 100,

the body assembly 10, the cabinet 11, the interlock escape groove 111, the motor 12, the main switch 13, the switch part 131, the link member 132, the interference part 1321, the fitting groove 1322,

a chassis assembly 20, a work floor 21, a tensioning mechanism 22,

a control member 30, a switch avoidance groove 31, a card groove 32,

an elastic limiting member 40, a plug 41, a limiting groove 411, an elastic member 42, a guide seat 43, a guide groove 431, a first bracket 441, a second bracket 442, a third bracket 443,

the interlocking member 50, the rotation portion 51, the first connecting arm 52, the abutting portion 521, the second connecting arm 53, the locking button portion 531, and the interlocking projection 5311.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

An electric power tool 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 6. The power tool 100 herein may be a sander, an angle grinder, or the like.

As shown in fig. 1 to 6, the power tool 100 according to the embodiment of the present invention includes a body assembly 10, a chassis assembly 20, and a control member 30.

The body assembly 10 includes a casing 11, a motor 12, and a main switch 13, the motor 12 is disposed in the casing 11, and the main switch 13 is used for controlling the motor 12 to be turned on or off, that is, the main switch 13 can be adjusted to a position for turning on the motor 12, and also can be adjusted to a position for turning off the motor 12.

The chassis assembly 20 includes a working base plate 21 and a tensioning mechanism 22, the working base plate 21 is driven by the motor 12 to rotate, the tensioning mechanism 22 is connected with the body assembly 10, the tensioning mechanism 22 and the working base plate 21 can be switched between a locked state and an unlocked state, when the tensioning mechanism 22 and the working base plate 21 are in the locked state, the two are not separable, and when the tensioning mechanism 22 and the working base plate 21 are in the unlocked state, the two are separable.

The control member 30 is mounted to the cabinet 11, and the control member 30 is switched between an open state in which the control member 30 allows the work base 21 to be separated from the tension mechanism 22 and a closed state in which the control member 30 locks the work base 21 to the tension mechanism 22.

The housing 11 is provided with an elastic limiting member 40 and an interlocking member 50, and the interlocking member 50 is adapted to cooperate with the control member 30. Specifically, when the main switch 13 is adjusted to the position for turning on the motor 12, the main switch 13 stops against the interlocking member 50 to prevent the interlocking member 50 from moving, and at this time, the interlocking member 50 cooperates with the control member 30 to prevent the control member 30 from being switched to the open state, that is, the control member 30 cannot be operated by the user, and the control member 30 is always in the closed state. When the main switch 13 is adjusted to a position for turning off the motor 12, the interlocking member 50 is allowed to move, and if the user triggers the interlocking member 50 to move, so that the interlocking member 50 is disengaged from the control member 30, the control member 30 is switched to an open state under the action of the elastic limiting member 40. When the control member 30 is switched to the open state, the elastic limiting member 40 stops against the main switch 13, so as to prevent the main switch 13 from being adjusted to the position for turning on the motor 12, that is, the user cannot operate the main switch 13, and the main switch 13 is always in the position for turning off the motor 12.

According to the electric tool 100 of the embodiment of the present invention, by providing the interlocking member 50 and the elastic limiting member 40, when the main switch 13 is adjusted to the position of turning on the motor 12, the interlocking member is stopped to limit the movement of the interlocking member 50, the interlocking member 50 is used to limit the control member 30 in the closed state, and further the control member 30 is prevented from being switched to the open state, so that the user cannot replace the working base plate 21; when the control member 30 is switched to the open state, the elastic limiting member 40 stops against the main switch 13, so that the main switch 13 is prevented from being adjusted to the position for starting the motor 12, a user cannot start the motor by starting the main switch 13, the problem of burning of the motor 12 is prevented, and the damage of the whole electric tool is avoided.

Therefore, the main switch 13 and the control member 30 of the electric tool 100 cannot be simultaneously turned on, so that the motor 12 cannot be turned on when the working base plate 21 is removed and replaced, thereby preventing the motor 12 from being damaged, and the working base plate 21 cannot be removed and replaced when the motor 12 works, thereby ensuring the use reliability and the use safety of the electric tool 100.

According to one embodiment of the invention, the control member 30 is in driving connection with the tensioning means 22, and the tensioning means 22 is disconnected from the work bottom 21 by operating the control member 30 when the control member 30 is in the open state.

In some examples, the control member 30 may be reversible relative to the fuselage assembly 10, and the control member 30 may be rotated in the open state after the control member 30 is flipped from the closed state to the open state.

Referring to fig. 1, the control member 30 is in a closed state, and when the user turns the control member 30 clockwise to the position shown in fig. 3, the control member 30 is in an open state, and the tensioning mechanism 22 and the work base 21 are still in a locked state and are not separated during the turning of the control member 30.

When the control member 30 is switched to the open state, the tensioning mechanism 22 and the working bottom plate 21 are switched from the locked state to the unlocked state by rotating the control member 30, so that the working bottom plate 21 can be detached from the tensioning mechanism 22, and thus the control member 30 can realize the locking and unlocking of the tensioning mechanism 22 and the working bottom plate 21, and a user can conveniently replace the working bottom plate 21.

In some examples, the control member 30 is formed in an elongated wrench shape, and one end (a front end as shown in fig. 1) of the control member 30 is pivotably connected to the cabinet 11, and the other end (a rear end as shown in fig. 1) of the control member 30 is adapted to be engaged with the interlocking member 50. For example, one end of the control member 30 may be formed with a cam, whereby the rotational movement of the control member 30 can be transmitted to the tensioning mechanism 22 by rotating the control member 30 when the control member 30 is in the open state.

In some specific examples, the other end of the control member 30 has a slot 32 with one side open, and the interlocking member 50 has an interlocking protrusion 5311 adapted to be inserted into the slot 32, and the interlocking member 50 and the control member 30 can be detachably engaged by using the slot 32 and the interlocking protrusion 5311 to engage with each other. In addition, the interlocking piece 50, the main switch 13, the control piece 30 and the elastic limiting piece 40 are mutually matched, so that the purpose that the main switch 13 and the control piece 30 cannot be opened simultaneously is achieved, the use safety of the electric tool 100 is ensured, and the user experience is improved.

Referring to fig. 1 and 2, when the main switch 13 is adjusted to the position for turning on the motor 12, the main switch 13 stops against the interlocking member 50, so that the interlocking member 50 cannot move, and at this time, the interlocking protrusion 5311 of the interlocking member 50 is always inserted into the slot 32 of the control member 30, so that the control member 30 cannot be switched from the closed state to the open state.

Referring to fig. 3 and 4, when the main switch 13 is adjusted to a position for turning off the motor 12, the interlocking member 50 may be activated, and when the user triggers the interlocking member 50 to disengage the interlocking protrusion 5311 of the interlocking member 50 from the engaging groove 32 of the control member 30, the control member 30 is sprung up by the elastic limiting member 40, thereby being switched from the closed state to the open state.

As shown in fig. 1 to 4, according to an alternative embodiment of the present invention, the elastic limiting member 40 includes a plug 41 and an elastic member 42. The plug 41 is movable in an initial opening direction (up and down direction as shown in fig. 1 to 4) of the control member 30. The elastic member 42 is installed in the housing 11, and the elastic member 42 is connected to the plug 41, and the elastic member 42 is deformable in a moving direction of the plug 41.

Specifically, when the control member 30 is switched to the closed state, the plug 41 stops against a side (a lower side as shown in fig. 2) of the control member 30 facing the housing 11 under the action of the elastic member 42, that is, the elastic member 42 stores potential energy. When the main switch 13 is adjusted to the position for turning off the motor 12, if the user triggers the interlocking member 50 to disengage from the control member 30, the elastic member 42 releases potential energy, and the ejector 41 ejects the control member 30 under the action of the elastic member 42, so as to switch the control member 30 from the closed state to the open state.

Further, when the control member 30 is switched to the open state, the plug 41 stops against the main switch 13, so as to prevent the main switch 13 from moving toward the direction for turning on the motor 12, and further achieve the purpose that the control member 30 and the main switch 13 cannot be turned on simultaneously, at this time, the working base plate 21 can be detached from the tensioning mechanism 22 and the motor 12 is not turned on. When the main switch 13 is adjusted to the position for turning on the motor 12, the main switch 13 is stopped against the interlocking member 50, so that the interlocking member 50 is prevented from moving, the interlocking member 50 is always matched with the control member 30, and the control member 30 cannot be switched from the closed state to the open state, at this time, the motor 12 is turned on, and the work bottom plate 21 cannot be detached from the tensioning mechanism 22.

Therefore, by adopting the elastic limiting piece 40 comprising the top head 41 and the elastic piece 42, the potential energy of the elastic piece 42 can be stored and released, the control piece 30 can be bounced by the released potential energy, and the top head 41 can limit the movement of the main switch 13 when the control piece 30 is in an open state, so that the main switch 13 is prevented from being adjusted to a position for starting the motor 12, and the motor 12 is ensured to be in a closed state when the working bottom plate 21 is disassembled and replaced.

In some examples, a guide seat 43 is provided in the housing 11, the guide seat 43 has a guide groove 431 with an open upper end, the plug 41 movably fits the guide groove 431 of the guide seat 43, and the elastic member 42 is located between the plug 41 and the elastic member 42. Through setting up the guide holder 43, both can play the supporting role to top 41 and elastic component 42, can play limiting displacement to the motion of top 41 and elastic component 42 again, guarantee the normal work of elasticity locating part 40.

In some examples, the plug 41 has a stopper groove 411 opened toward the guide seat 43, that is, the plug 41 has a stopper groove 411 opened downward as shown in fig. 2 and 4, and the elastic member 42 is fitted in the stopper groove 411. By limiting the limiting groove 411 on the plug 41, the elastic member 42 can be supported, and the elastic member 42 can be limited, so that the normal operation of the elastic limiting member 40 is ensured.

In some examples, the resilient member 42 is a spring.

When the control member 30 is switched to the closed state, the spring is in a compressed state, and the plug 41 stops against the side of the control member 30 facing the casing 11 under the action of the spring, that is, the elastic member 42 stores potential energy.

When the main switch 13 is adjusted to the position for turning off the motor 12, if the user triggers the interlocking member 50 to disengage from the control member 30, the elastic member 42 releases potential energy, and the ejector 41 ejects the control member 30 under the restoring force of the elastic member 42, thereby switching the control member 30 from the closed state to the open state.

When the control member 30 is switched to the open state, the plug 41 stops against the main switch 13, so that the main switch 13 is prevented from moving towards the direction of starting the motor 12, and the purpose that the control member 30 and the main switch 13 cannot be started simultaneously is achieved, at this time, the working base plate 21 can be detached from the tensioning mechanism 22, and the motor 12 is not started.

When the main switch 13 is adjusted to the position for turning on the motor 12, the main switch 13 is stopped against the interlocking member 50, so that the interlocking member 50 is prevented from moving, the interlocking member 50 is always matched with the control member 30, and the control member 30 cannot be switched from the closed state to the open state, at this time, the motor 12 is turned on, and the work bottom plate 21 cannot be detached from the tensioning mechanism 22.

As shown in fig. 5 and fig. 6, according to another alternative embodiment of the present invention, the elastic limiting member 40 can be elastically deformed, that is, the elastic limiting member 40 has elastic properties, and the elastic limiting member 40 has a convex portion.

When the control member 30 is switched to the closed state, the convex part is pressed by the control member 30, so that the elastic limiting member 40 stores potential energy, and when the control member 30 is switched to the open state, the side part of the convex part stops against the main switch 13, so that the main switch 13 is prevented from being adjusted to the position for starting the motor 12; when the main switch 13 is adjusted to the position for turning off the motor 12, if the user triggers the interlocking member 50 to disengage from the control member 30, the elastic limiting member 40 releases potential energy, so that the control member 30 is jacked up through the convex portion, the structure of the elastic limiting member 40 is simple, and the above functions are easily realized.

In some examples, the elastic limiting member 40 includes an elastic support and a coating body coated on the outer surface of the elastic support. The cladding body cladding is at the surface of elastic support, and at least partly of cladding body forms the convex part, and forms the partly cladding of convex part and wrap the partly of elastic support in, and the cladding body can play the effect of protection to the elastic support to can also increase the volume of elasticity locating part 40, make its installation easier, improve the use reliability of elasticity locating part 40.

In some specific examples, the resilient legs include a first leg 441 and a second leg 442. The first bracket 441 extends toward the control member 30 in a longitudinal direction (vertical direction as shown in fig. 6), and a part of the cover is covered on an outer surface of the first bracket 441 to form a convex portion. The second bracket 442 extends in the transverse direction, one end of the second bracket 442 is connected to the first bracket 441, and the other end of the second bracket 442 extends in the longitudinal direction away from the control member 30 and then extends in the transverse direction toward the first bracket 441.

Therefore, the first bracket 441 extending along the longitudinal direction and the coating body coated on the outer surface of the first bracket 441 are arranged, so that the control element 30 can be supported, and when the control element 30 is in a closed state, the elastic limiting element 40 can be well abutted against the control element 30 through the first bracket 441; by providing the second support 442 extending in the transverse direction, the elastic support can have the property of deforming in the longitudinal direction, so that the elastic limiting member 40 can be elastically deformed to store potential energy.

In a further example, the elastic bracket further includes a third bracket 443, the third bracket 443 obliquely extends in a lateral direction and one end of the third bracket 443 is connected to the first bracket 441, and the other end of the third bracket 443 extends in a longitudinal direction away from the control member 30.

For example, referring to fig. 6, the third support 443 extends obliquely upward along one end thereof to the other end thereof. Through setting up third support 443 and the cladding body of cladding at its surface, can also play the supporting role to guaranteeing elastic limiting part 40's structural stability and stress balance, improve elastic limiting part 40's use reliability.

According to a further embodiment of the invention, the main switch 13 is movable between a position in which the motor 12 is switched on and a position in which the motor 12 is switched off. Wherein, the main switch 13 is provided with an interference part 1321 adjacent to the interlocking piece 50 for abutting against the interlocking piece 50 to prevent the interlocking piece 50 from moving,

in some examples, the main switch 13 may move in the front-back direction shown in fig. 1 to 6, the interlocking member 50 is disposed behind the main switch 13, and an interference portion 1321 is disposed at the rear portion of the main switch 13, when the main switch 13 moves to the position of turning on the motor 12, the interference portion 1321 of the main switch 13 abuts against the interlocking member 50, so as to prevent the interlocking member 50 from moving, ensure that the interlocking protrusion 5311 of the interlocking member 50 is always engaged with the slot 32 of the control member 30, and further ensure that the control member 30 cannot be switched from the closed state to the open state.

In some examples, the interlock 50 is rotatable about a fixed axis, and the interlock 50 has a locking button portion 531 and an abutment portion 521. The locking button portion 531 is adapted to be operated by a user's hand to facilitate the user to control the rotation of the interlocking member 50, and the abutting portion 1321 is adapted to be engaged with the abutting portion 521 to achieve the engagement of the interlocking member 50 with the main switch 13. The interference portion 1321 may be a downward protrusion of the main switch 13, and the interference portion 521 is an upward extending hook of the interlock member 50.

When the main switch 13 is adjusted to the position for turning off the motor 12, the abutting portion 521 of the interlocking piece 50 is disengaged from the abutting portion 1321 of the main switch 13, when the user triggers the locking button portion 531 of the interlocking piece 50, the slot 32 of the control member 30 is disengaged from the interlocking protrusion 5311 of the interlocking piece 50, and the control member 30 is sprung upward under the action of the elastic limiting piece 40, so that the control member 30 is switched from the closed state to the open state. When the main switch 13 is adjusted to the position for turning on the motor 12, the abutting portion 1321 of the main switch 13 abuts against the abutting portion 521 of the interlocking member 50, so that the interlocking member 50 is prevented from rotating, the interlocking protrusion 5311 of the interlocking member 50 is ensured to be always matched with the slot 32 of the control member 30, and the control member 30 cannot be switched from the closed state to the open state.

In some examples, the interlock 50 includes a swivel portion 51, a first connecting arm 52, and a second connecting arm 53. The rotating portion 51 is rotatable around a fixed axis, one end of the first connecting arm 52 is connected with the rotating portion 51, the other end of the first connecting arm 52 is provided with a stop portion 521, one end of the second connecting arm 53 is connected with the rotating portion 51, and the other end of the second connecting arm 53 is provided with a locking button portion 531.

That is, the user drives the rotation portion 51 to rotate by touching the locking button portion 531, and the rotation portion 51 drives the stopping portion 521 on the first connecting arm 52 to move, so that when the main switch 13 is at the position for closing the motor 12, the main switch 13 is prevented from moving to the position for opening the motor 12, and the main switch 13 and the control member 30 cannot be opened simultaneously.

In some examples, the housing 11 has an interlock escape slot 111 for escaping the lock button portion 531. Through set up the interlocking on casing 11 and dodge groove 111, prevent that interlocking piece 50 from taking place to interfere with casing 11 when the activity, guarantee electric tool 100's normal work, promote user experience.

According to a further embodiment of the present invention, the main switch 13 includes a switch portion 131 and a link 132, the switch portion 131 is used for manual operation, the link 132 is connected to the switch portion 131 so that the link 132 moves together with the switch portion 131, and the interference portion 1321 is provided to the link 132. The elastic limiting member 40 is disposed through the linking member 132 to stop against the control member 30 when the control member 30 is switched to the closed position, and stop against the linking member 132 to stop the main switch 13 from moving when the control member 30 is switched to the open state.

In some examples, the link 132 is formed in a rod shape extending in the front-rear direction, the front end of the link 132 is connected to the switch portion 131, the rear end of the link 132 is provided with an interference portion 1321 extending downward, the middle portion of the link 132 is provided with an opening, the elastic limiting member 40 is inserted into the opening and abuts against the control member 30 when the control member 30 is in the closed state, and abuts against the main switch 13 when the control member 30 is in the open state, so that the main switch 13 is prevented from moving to the position where the motor 12 is turned on, and the structure is simple and convenient to control.

In some examples, a side of the interference portion 1321 facing away from the interlock piece 50 in the moving direction of the main switch 13 has a fitting groove 1322 adapted to be fitted with the interference portion 521.

That is, when the main switch 13 is in a position for turning off the motor 12, the main switch 13 is not engaged with the interlock 50 at this time, that is, the interlock 50 can be rotated, and if the user triggers the locking button portion 531 to rotate the interlock 50, the abutting portion 521 of the interlock 50 is engaged with the engaging groove 1322 of the link 132, that is, the interlock 50 hooks the main switch 13, so that the main switch 13 is prevented from moving to a position for turning on the motor 12, further, the main switch 13 and the control 30 cannot be simultaneously turned on, and the use safety of the electric switch and the replacement safety of the operating base plate 21 are ensured.

In some examples, the control member 30 has a switch avoidance groove 31 for avoiding the switch section 131. Through set up switch dodge groove 31 at control 30, prevent that control 30 from taking place to interfere with main switch 13 when the activity, guarantee the independence of control 30 and main switch 13's function and structure to guarantee electric tool 100's normal work, promote user experience.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Other constructions and operations of a power tool 100, such as a sander, according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric power tool, characterized by comprising:

the device comprises a machine body assembly and a control system, wherein the machine body assembly comprises a machine shell, a motor arranged in the machine shell and a main switch used for controlling the opening and closing of the motor;

the chassis assembly comprises a working bottom plate and a tensioning mechanism, the working bottom plate is driven by the motor to rotate, and the tensioning mechanism is connected with the machine body assembly;

a control mounted to the housing and switchable between an open state and a closed state, the control configured to allow the work bedplate to be separated from the tensioning mechanism in the open state and to lock the work bedplate with the tensioning mechanism in the closed state;

wherein the casing is provided with an elastic limiting piece and an interlocking piece which is suitable for being matched with the control piece,

when the main switch is adjusted to a position for starting the motor, the main switch is stopped against the interlocking piece to prevent the interlocking piece from moving, and the interlocking piece is matched with the control piece to prevent the control piece from being switched to the open state;

when the main switch is adjusted to a position for closing the motor, the interlocking piece is allowed to move, and when the interlocking piece is triggered to be disengaged from the control piece, the control piece is switched to the opening state under the action of the elastic limiting piece;

when the control piece is switched to the opening state, the elastic limiting piece stops against the main switch to prevent the main switch from being adjusted to the position for starting the motor.

2. The power tool of claim 1, wherein the control member is drivingly connected to the tensioning mechanism, and wherein manipulation of the control member disengages the tensioning mechanism from the work plate when the control member is in the open state.

3. The power tool of claim 2, wherein the control member is formed in an elongated wrench shape, and one end of the control member is pivotably connected to the housing, and the other end of the control member is adapted to interlock with the interlocking member.

4. The power tool of claim 3, wherein the other end of the control member has a slot open at one side, and the interlocking member has an interlocking projection adapted to be inserted into the slot.

5. The power tool of any one of claims 1-4, wherein the resilient stop comprises:

a plug movable in an initial opening direction of the control member;

an elastic member installed in the casing and connected to the plug, the elastic member being deformable in a moving direction of the plug,

when the control element is switched to the closed state, the ejector head stops against one side of the control element facing the shell under the action of the elastic element;

when the control piece is switched to the opening state, the ejector head stops against the main switch;

when the main switch is adjusted to a position for closing the motor, the ejector jacks up the control piece under the action of the elastic piece when the interlocking piece is triggered to be disengaged from the control piece.

6. The power tool of claim 5, wherein a guide seat is provided in the housing, the guide seat having a guide groove, the plug being movably engaged with the guide groove, and the elastic member being located between the plug and the elastic member.

7. The power tool according to claim 6, wherein the plug has a stopper groove opened toward the guide holder, and the elastic member is fitted in the stopper groove.

8. The power tool of claim 5, wherein the resilient member is a spring.

9. The power tool according to any one of claims 1 to 4, wherein the elastic stopper is elastically deformable and has a convex portion,

when the control member is switched to the closed state, the convex part is pressed by the control member to store potential energy,

when the control piece is switched to the opening state, the side part of the convex part stops against the main switch;

when the main switch is adjusted to a position for closing the motor and the interlocking piece is triggered to be disengaged from the control piece, the elastic limiting piece releases potential energy and jacks up the control piece through the convex part.

10. The power tool of claim 9, wherein the resilient retainer includes a resilient support and a coating covering an outer surface of the resilient support, at least a portion of the coating forming the protrusion.

11. The power tool of claim 10, wherein the resilient mount comprises:

the first bracket extends towards the control part along the longitudinal direction, and a part of the cladding body is coated on the outer surface of the first bracket to form the convex part;

the second support extends along the transverse direction, one end of the second support is connected with the first support, and the other end of the second support extends along the longitudinal direction towards the direction far away from the control piece and then extends along the transverse direction towards the first support.

12. The power tool of claim 11, wherein the resilient mount further comprises:

the third support extends along the transverse direction in an inclined mode, one end of the third support is connected with the first support, and the other end of the third support extends along the longitudinal direction in a direction far away from the control piece.

13. The electric power tool as claimed in any one of claims 1 to 4, wherein the main switch is movable between a position of turning on the motor and a position of turning off the motor, and a portion of the main switch adjacent to the interlock is provided with an interference portion for interfering with the interlock to prevent the interlock from moving.

14. The power tool of claim 13, wherein the interlock is rotatable about a fixed axis and has a lock knob for manual operation and an abutment cooperating with the abutment.

15. The power tool of claim 14, wherein the interlock comprises:

a rotating portion rotatable about the fixed axis;

one end of the first connecting arm is connected with the rotating part, and the other end of the first connecting arm is provided with the stopping part;

and one end of the second connecting arm is connected with the rotating part, and the other end of the second connecting arm is provided with the locking button part.

16. The power tool of claim 14, wherein the housing has an interlock avoidance slot for avoiding the lock knob portion.

17. The power tool of claim 14, wherein the main switch comprises:

a switch section for manual operation;

a linkage member connected with the switch portion to move together with the switch portion, the interference portion being provided to the linkage member,

the elastic limiting piece penetrates through the linkage piece to abut against the control piece when the control piece is switched to the closing position, and abuts against the linkage piece to prevent the main switch from moving when the control piece is switched to the opening state.

18. The electric power tool as claimed in claim 17, wherein a side of the interference portion facing away from the interlocking member in the moving direction of the main switch has a fitting groove adapted to fit with the interference portion.

19. The power tool of claim 17, wherein the control member has a switch avoidance groove for avoiding the switch portion.