CN212193016U - Handheld tool knife rest quick-change structure and handheld tool - Google Patents

Abstract

The utility model discloses a hand-held tool knife rest quick change structure and hand-held tool, hand-held tool knife rest quick change structure includes shell and detachably pegged graft the knife rest shell on the shell, be provided with the locking circle in the shell with rotating, the pore wall department of the central through-hole of locking circle is formed with at least one stopper, the knife rest shell can be pegged graft in the central through-hole of locking circle and has the dog that corresponds with the stopper on it, the stopper is driven by a deformation mechanism and is moved between the first position and the second position, in the first position, the stopper and the projection of dog on the plane perpendicular to the axis of locking circle at least partially coincide and their relative terminal surface lean on; and at the second position, the projection of the limiting block and the stop block on a plane vertical to the axis of the locking ring is not coincident. This scheme adopts knob formula unblock, locking structure, need not vigorously press so that the elasticity clamp expansion during the unblock, the processing ease to the locking of this scheme is realized by the face contact, and the stability of locking is good.

Description

Handheld tool knife rest quick-change structure and handheld tool

Technical Field

The utility model belongs to the technical field of hand-held tool and specifically relates to hand-held tool knife rest quick change structure and hand-held tool.

Background

The hand-held tool controls the start and stop of the motor through the start-stop button, so that the torque of the motor is transmitted to parts such as a drill bit, a saw, a grinding disc, a hammer and the like through a certain torque transmission structure, and the drill bit, the saw, a rotary disc and the like can rotate, stretch in and out in a reciprocating mode or shake.

As the kinds and functions of the hand-held tools become more and more abundant, users generally need to purchase hand-held tools with corresponding functions respectively to meet certain use requirements, which increases the use cost of users, and in view of that the driving structures of the hand-held tools are basically similar, a structure which can be detachably assembled with the tool holders with different types and functions through one driving structure is appeared, and the structure realizes the fixation of the tool holder through the contraction of an elastic clamp fixed on the shell and the embedding of the elastic clamp into a clamping groove on the tool holder; when the tool rest is detached, the elastic clamp hoop is driven by pressing a button on the shell to expand and withdraw from a clamping groove in the tool rest, so that the tool rest can be taken out by removing the limit on the tool rest.

However, in such a structure, a large force is required to expand the elastic band to withdraw the elastic band from the clip groove, and the requirement for the finger force of a user is high, and the elastic band is not changed for users such as women.

In addition, the elastic clamp is made of metal wires or metal sheets, the contact area between the elastic clamp and the knife rest is small, the tolerance is small, the fixing stability is weak, and certain vibration exists in the knife rest during work, so that the operation is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a handheld tool knife rest quick change structure and handheld instrument in order to solve the above-mentioned problem that exists among the prior art.

The purpose of the utility model is realized through the following technical scheme:

a quick change structure for a knife rest of a hand-held tool comprises a shell and a knife rest shell which is detachably inserted into an opening at one end of the shell, wherein a locking ring is arranged in the shell in a self-rotating manner, the locking ring is provided with a manual block extending to the outer surface of the shell, at least one limiting block is formed at the hole wall of a central through hole of the locking ring, the knife rest shell can be inserted into the central through hole of the locking ring and is provided with a stopping block corresponding to the limiting block, and the limiting block is driven by a deformation mechanism to move between a first position and a second position,

in the first position, the projection of the stop block on a plane perpendicular to the axis of the locking ring is at least partially overlapped with the projection of the stop block on the plane, and the opposite end faces of the stop block and the stop block abut against each other;

and at the second position, the projection of the limit block and the stop block on a plane vertical to the axis of the locking ring is not coincident.

Preferably, in the quick-change structure of the tool holder of the hand-held tool, a circular slot is formed in the inner wall of the housing, and a circular truncated cone embedded in the circular slot is arranged on the locking ring.

Preferably, in the quick-change structure of the tool holder for the hand-held tool, a limit surface is arranged on the side wall of the housing of the tool holder at the front end of the stop block, and the width of the limit block is equal to the distance between the stop block and the limit surface.

Preferably, in the quick-change structure of the tool holder for the hand-held tool, at least one guide strip extending in the axial direction of the tool holder housing is formed on the peripheral wall of the tool holder housing, and a guide groove matched with the guide strip is formed on the inner wall of the housing.

Preferably, in the quick change structure of the tool holder of the hand-held tool, the guide groove is an isosceles trapezoid groove, the width of the opening end of the isosceles trapezoid groove is greater than that of the inner end of the isosceles trapezoid groove, and the guide strip is consistent with the guide groove in shape.

Preferably, in the quick-change structure of the tool holder of the hand-held tool, a retainer ring positioned behind the limiting block is coaxially arranged at the hole wall of the central through hole of the locking ring, the thickness of the retainer ring is greater than that of the limiting block, and the distance between the retainer ring and the limiting block is not less than the width of the stop block.

Preferably, in the quick-change structure for the tool holder of the hand-held tool, an auxiliary limiting ring is coaxially arranged in a central through hole of the locking ring, and the end surface of the auxiliary limiting ring opposite to the stop block is tightly attached to the locking ring in a locking state.

Preferably, in the quick-change structure of the tool holder of the hand-held tool, the deformation mechanism comprises at least one tension spring or torsion spring, one end of the tension spring or torsion spring is fixed on the locking ring, and the other end of the tension spring or torsion spring is fixed on the shell.

Preferably, in the quick-change structure of the tool holder of the hand tool, the deformation mechanism comprises two centrosymmetric U-shaped or V-shaped or L-shaped elastic pieces.

The handheld tool comprises the handheld tool knife rest quick-change structure, wherein a motor is arranged in the shell, and a rotating shaft of the motor is detachably connected with a power output structure arranged in the knife rest shell.

The utility model discloses technical scheme's advantage mainly embodies:

this scheme design is exquisite, adopts knob formula unblock structure, need not vigorously press so that elasticity clamp expansion when unblock and installation, and the processing ease is low to operating personnel's requirement to the locking of this scheme is realized by face contact, and the stability of locking is good.

The design of this scheme through multiple wedge guide structure can effectively simplify the assembly operation, both reduced the fit-up gap, makes the equal stable fixed of knife rest shell front and back end simultaneously, and the vibration of knife rest shell when avoiding using is favorable to improving the stability of operation and use experience and feels.

Through the design of retaining ring and supplementary spacing ring, can effectually carry on spacingly to the inner of dog to avoid it to remove, improve the stability of whole joint.

The reset structure of this scheme realization mode is various, can design according to the application scenario of difference, and is simple and easy, and the installation space who occupies is little, and stability is high.

Drawings

Fig. 1 is a cross-sectional view of the present invention (the right half of the housing is hidden);

fig. 2 is an exploded view of the present invention (with the right half of the housing hidden);

fig. 3 is a front end view of the present invention (with the right half of the housing hidden);

fig. 4 is a perspective view of the present invention (the right half of the housing is hidden);

FIG. 5 is a perspective view of the locking ring and deformation mechanism of the present invention;

fig. 6 is an end view of the locking ring of the present invention;

FIG. 7 is a side view of the tool holder housing and guide plate of the present invention;

figure 8 is an end view of the guide plate of the present invention;

fig. 9 is a cross-sectional view of the hand tool of the present invention;

FIG. 10 is a schematic view of the steering control mechanism of the present invention in a housing;

fig. 11 is an end view of the steering control mechanism of the present invention in a housing (with a portion of the housing hidden);

fig. 12 is a front view of the steering control mechanism of the present invention;

fig. 13 is a plan view of the steering control mechanism of the present invention;

fig. 14 is a plan view of the steering switch key of the present invention;

fig. 15 is an exploded view of the drive plate on the tool holder of the present invention corresponding to the steering control mechanism.

The structures of the parts in the figures are only schematic of the relevant structures and are not the only limitations on the parts.

Detailed Description

Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are merely exemplary embodiments for applying the technical solutions of the present invention, and all technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the scope of the present invention.

In the description of the embodiments, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

The quick-change structure of the tool holder of the hand tool disclosed in the present invention is explained below with reference to the accompanying drawings, as shown in fig. 1 to fig. 4, which include a housing 1, and the shape of the housing 1 may refer to the shape of various hand tools, for example, the housing of a gun-shaped electric drill or the housing of a pen-shaped electric drill. Use the rifle shape electric drill as the example, shell 1 can be that one inside that two symmetrical halves (only show the structure of half on the left side in the picture) combinations form has the cavity and has one end open-ended structure, and it includes the portion of gripping and the installation department that is used for the staff to grip, installation department is formed with a circular shape inner chamber, the opening is located the front end of installation department.

As shown in fig. 2, a knife rest housing 2 is detachably inserted into an opening of the housing 1, specifically, a circular slot 11 is disposed on an inner wall of the housing 1 near the opening, a locking ring 3 is coaxially and rotatably disposed at the circular slot 11, a circular truncated cone 33 embedded in the circular slot 11 is disposed on a circumferential surface of the locking ring 3, a width of the circular truncated cone 33 is equal to a width of the circular slot 11, and thus the circular slot 11 can effectively limit the circular truncated cone 33 to limit the locking ring 3. Of course, the circular truncated cone 33 may be a complete circle, or may be several discontinuous circular arc blocks. In other embodiments, the circular slot 11 formed on the inner wall of the housing 1 may also be replaced by a circular protrusion, and the outer wall of the locking ring 3 is formed with a slot matching with the circular protrusion, so as to limit the locking ring 3.

Further, as shown in fig. 2-5, the locking ring 3 has a manual block 31 extending to the outer surface of the housing 1, an avoiding hole 13 is formed on the housing 1 for the manual block 31 to pass through, and the width of the avoiding hole 13 is greater than that of the manual block 31, so that the manual block 31 has a certain rotation stroke. Preferably, the manual blocks 31 are two and symmetrically disposed on the left and right sides of the housing 1.

As shown in fig. 1, fig. 2 and fig. 5, at least one stopper 34 is formed on the wall of the central through hole 32 of the locking ring 3, the tool holder housing 2 can be inserted into the central through hole 32 of the locking ring 3 and has a stopper 21 thereon corresponding to the stopper 34, the stopper 34 is driven by a deformation mechanism 4 to move between a first position and a second position,

in the first position, the stop block 34 and the projection of the stop block 21 on the plane perpendicular to the axis of the locking ring 3 are at least partially overlapped and the opposite end faces abut;

in the second position, the stopper 34 is not coincident with the projection of the stopper 21 on a plane perpendicular to the axis of the locking ring 3.

In detail, as shown in fig. 2, the tool holder housing 2 has a first cylinder 25 and a second cylinder 26 which are coaxial and have different outer diameters, the circumferential wall of the first cylinder 25 is formed with four stoppers 21 which extend from the tail end surface to the front end surface for a certain distance and equally divide the circumferential wall, the four stoppers 21 can realize multipoint balanced clamping, the stability of clamping is ensured, and meanwhile, the damage of parts caused by local stress is avoided, and certainly, the number of the stoppers 21 can be more or less. Each stopper 21 has a certain radian, a gap is formed between the end faces of the stoppers 21 and the second cylinders 26, the end face of the second cylinder 26 facing the stopper 21 is a limiting face 22, and the width of the limiting block 34 is equal to the distance 23 between the stopper 21 and the limiting face 22, so that when the connection is performed, the limiting block 34 can be embedded into the gap between the end faces of the stoppers 21 and the second cylinders 26 to block the stopper 21 and position the limiting block 34.

When the tool rest shell 2 and the shell 1 need to be detached, the locking ring 3 is driven to rotate through the manual block, so that each limit block 34 on the locking ring 3 and the stop block 21 on the tool rest shell 2 are staggered, the limit blocks 34 do not shield the stop blocks 21, and the tool rest shell 2 can be pulled out of the locking ring 3.

When the knife rest shell 2 is installed, the locking ring 3 is rotated firstly, so that the limiting block 34 rotates to the second position, namely, the limiting block is dislocated with the stop block 21, at the moment, the limiting block 34 does not obstruct the axial movement of the knife rest shell 2, when the stop block 21 is inserted into the locking ring 3 and the limiting block 34 is positioned at the gap between the stop block 21 and the limiting surface 22, the manual block 31 is loosened, the manual block rotates reversely under the reaction force of the deformation mechanism 4 to reset, so that the locking ring 3 rotates reversely to reset, at the moment, each limiting block 34 is superposed with one stop block 21 and positioned at the outer side of the stop block 21, and therefore the stop block 21 is limited.

Further, in order to increase convenience in plugging and ensure the position precision between the stopper 21 and the limiting block 34, as shown in fig. 2 to fig. 3, at least one guide strip 24 extending along the axial direction of the cartridge housing 2 is formed at the outer peripheral wall of the second cylinder 26, and a guide groove 12 matching with the guide strip 24 is formed on the inner wall of the housing 1, so that the cartridge housing can be accurately positioned by inserting the guide strip 24 into the guide groove 12.

If the guide strips 24 and the guide grooves 12 are square, generally, in order to facilitate the insertion of the tool holder housing 2, as shown in fig. 2, the width of the guide grooves 12 is slightly larger than the width of the guide strips 24, and then, a certain gap exists between the guide strips 24 and the guide grooves 12, and when the tool holder housing is used later, the gap provides a space for vibration, so that the stability of the operation of the tool holder is reduced, and the operation hand feeling is affected.

Consequently, make guide way 12 is isosceles trapezoid groove, and its open end width is greater than inner width, gib block 24 with guide way 12 shape is unanimous to when gib block 24 inserts, grafting that can be convenient, can make the side of gib block 24 and the both sides inner wall of guide way 12 laminate completely simultaneously, thereby guarantee the fixed stability of front end (knife rest shell 2 is fixed when on the shell 1, the one end that is located the outside) of knife rest shell 2.

Further, in order to ensure the stability of the fixing of the stopper 21 and reduce the vibration of the end of the tool holder housing 2 extending into the housing, as shown in fig. 2, 5 and 6, a retaining ring 35 located behind the stopper 34 is coaxially arranged at the hole wall of the central through hole 32 of the locking ring 3, the thickness of the retaining ring 35 is greater than that of the stopper 34, and the distance between the retaining ring 35 and the stopper 34 is not less than the width of the stopper 21.

In an embodiment, when the distance between the retaining ring 35 and the stopper 34 is equal to the width of the stopper 21, the stopper 21 may be inserted into the gap between the retaining ring 35 and the stopper 34, and two side surfaces of the stopper 21 respectively abut against two opposite surfaces of the retaining ring 35 and the stopper 34, so as to achieve tight locking.

Of course, in another embodiment, as shown in fig. 1, the distance between the retainer ring 35 and the stopper 34 may be greater than the width of the stopper 21, an auxiliary stopper ring 6 is coaxially fixed in the central through hole of the locking ring 3, the auxiliary stopper ring 6 at least has a portion located between the retainer ring 35 and the stopper 34, and the end surface of the auxiliary stopper ring 6 opposite to the stopper 21 is tightly attached in the locked state of the stopper 21 and the locking ring 3, so that the inner end of the stopper 21 can be stably clamped between the auxiliary stopper ring 6 and the stopper 34 to avoid moving.

Meanwhile, as shown in fig. 1, a guide disc 5 coaxial with the locking ring 3 is fixed in the inner cavity of the housing 1, and as shown in fig. 7, the guide disc 5 may have an insertion block 51 inserted into a central through hole of the locking ring 3, so that the insertion block 51 can effectively cooperate with the circular truncated cone 33 on the locking ring 3 to realize axial positioning of the front end and the rear end of the locking ring 3, thereby ensuring the position accuracy of the locking ring 3 during rotation.

In addition, as shown in fig. 7 and 8, the surface 52 of the guide disc 5 facing the tool holder housing 2 has at least one limiting strip 53, in a preferred embodiment, the limiting strips 53 are multiple and equally divide the periphery of the central hole of the guide disc 5, and the limiting strips 53 are trapezoidal or wedge-shaped. The face of the tool holder housing 2 facing the guide disc 5 is provided with a limiting groove 28 matched with the limiting strips 53, each limiting groove 28 can be formed by a gap between two convex blocks 27 on the face of the tool holder housing, and the opposite vertex angle position of each convex block 27 is formed into a chamfer, so that the limiting groove 28 is formed into a shape that the width of an opening part is kept unchanged after the width of the opening part is gradually reduced, when the tool holder housing 2 is clamped with the locking ring 3, the two faces opposite to the convex blocks 27 are respectively attached to two side faces of one limiting strip 53, namely, the limiting strips 53 are embedded into the gaps of the two convex blocks 27 to be limited, in the structure, the auxiliary limiting ring 6 in the embodiment and the check ring 35 on the locking ring can be omitted, and meanwhile, the length of the first stop of the tool holder housing 2 and the width of the stop block are.

The deformation mechanism 4 can be various mechanisms that can make the locking ring 3 automatically reset when not being acted by other external force, for example, it can include at least one tension spring or torsion spring with one end fixed on the locking ring 3 and the other end fixed on the shell.

In a preferred embodiment, as shown in fig. 1, fig. 2, fig. 4, and fig. 5, two blocks 36 with central symmetry are formed on the circumferential surface of the circular truncated cone 33 of the locking ring 3, and the two blocks 36 are distributed between the two manual blocks 31 on the locking ring 3, the blocks 36 are L-shaped and extend out of the slots 11 formed on the inner wall of the housing 1, and a space 14 for the blocks 36 to move is formed on the inner wall of the housing 1.

As shown in fig. 5, one end of a U-shaped or V-shaped or L-shaped elastic member 41, 42 is connected to each of the two blocks 36, the main body of the U-shaped or V-shaped or L-shaped elastic member 41, 42 is located at the space 14 formed on the housing 1, and the other end of the U-shaped or V-shaped or L-shaped elastic member 41, 42 abuts against or is fixed at the side wall 15 of the space 14, when the manual block 31 is manually driven to rotate, the locking ring 3 rotates and applies pressure to the elastic member 41, 42 to deform the elastic member 41, 42 to accumulate energy; when the operator releases the hand block, the elastic members 41, 42 release energy to restore the original shape, thereby driving the locking ring 3 to rotate reversely and reset.

The present disclosure further discloses a hand tool, as shown in fig. 9, which includes the quick-release quick-assembly connecting structure of the above embodiment, and the housing 1 is provided with a motor 10, a transmission structure (marked in the figure), a control board 20, and other structures. The housing 1 is provided with a start key 30 protruding out of the housing 1 to control the start and stop of the motor 10 and a steering switch key 40 partially protruding out of the housing body to control the forward rotation, the reverse rotation and the locking of the motor 10, and normally, when the steering switch key 40 is located at a middle position (locking position), the hand tool is locked, and the start key 30 cannot control the motor to rotate; when the steering switch key 40 is located at the left side (positive indexing), the start key 30 can control the motor to rotate forward; when the steering switch key 40 is in the right position (reverse position), the start key can control the motor to rotate in reverse. The entire hand tool may be powered by known mains power connections and/or by battery power. The above-mentioned structures of the motor 10, the control panel 20, the start key 30, the steering switch key 40, and the power supply are all conventional configurations of various handheld tools, which are not the design points of the present solution, and are not described herein again.

Further, other structures of the conventional hand tool, such as a torque transmission structure, a clutch mechanism, a torque adjusting mechanism, a lighting lamp, etc., can be arranged on or in the housing 1.

The tool rest housing 2 is a housing of the tool rest 90 with different functions, and each tool rest housing 2 is detachably connected with the housing 1, and when the tool rest housing 2 and the housing 1 are assembled into a whole, the housing is directly or indirectly connected with the motor 10 through a structure in the housing, so that the torque of the motor is transmitted to a working head, such as a drill bit or a reciprocating saw, installed on the tool rest 90, and the working head, such as the drill bit or the reciprocating saw, is driven to rotate or reciprocate.

A torque output structure that can be directly or indirectly connected to a motor and transmits torque is provided in the tool holder housing 2 of the tool holder 90 having different functions, for example, as shown in fig. 9, an output shaft 50 is coaxially and rotatably provided in the tool holder housing 2, and when the tool holder housing 2 is fixed in the housing 1, a spline 60 coaxially fixed to a rotation shaft of the motor 10 is inserted into a spline groove formed at an inner end surface of the output shaft 50, thereby achieving power transmission. And the torque output structure can change the rotation motion of the motor into reciprocating linear motion or swing motion and other forms for output, and the corresponding structures are known technologies, which are not the design points of the scheme and are not described herein. Of course, the connection structure of the torque output structure in the tool holder housing 2 and the motor can refer to the torque output structures disclosed in the prior art with application numbers 981185789, 991005600, 011119624, 2007200359081, and the like.

Since part of the tool holder 90, for example, the tool holder with functions of polishing machine, circular saw, etc., is assembled to the housing 1 and connected to the motor torque transmission, only one direction of rotation of the motor is needed, and correspondingly, a certain steering control mechanism is needed to achieve the above purpose, specifically, by controlling the steering switch key 40:

as shown in fig. 10 and 11, the steering control mechanism includes a steering switch lock 70 provided at the socket end of the housing 1, the steering switch lock 70 is driven to move linearly between a first position and a second position,

the steering switch lock 70 is in a first position that is unrestrained to movement of the steering switch key 40;

the steering switch lock 70 is in the second position, which restricts the steering switch key from being in the forward or reverse position or restricts the steering switch key 40 from being in the lock position and movable only to one side.

The steering switching locking member 70 is located at an interface where the housing 1 is butted with different knife rests, and the front end of the steering switching locking member is exposed, and a guiding structure for guiding the steering switching locking member 70 is arranged on the housing 1, for example, a group of positioning notches or positioning grooves are arranged on the inner wall of the housing 1 to ensure that the steering switching locking member 70 can move along the axis Y direction parallel to the main body of the housing 1.

As shown in fig. 12 and 13, the steering switch locking member 70 includes a main plate 701 and a blocking portion 702 located on a bottom surface thereof, the main plate 701 includes a front end plate 703 and a rear end plate 704 having a height difference and a connecting portion 705 connecting the front end plate and the rear end plate 704, the rear end plate 704 has a front end and a rear end with different widths and a bent portion 706 formed at a distal end thereof, and the blocking portion 702 is a cylinder, and preferably a cylinder.

Meanwhile, the main plate 701 is held in the first position by an elastic member 80 abutting against the main plate, and the elastic member 80 may be an elastic element that deforms when pressed and automatically restores when the pressure is removed, such as a spring, a metal spring, or even a sponge, and preferably is a spring, and the spring is sleeved on the periphery of the rear end plate 704, and one end of the spring abuts against a step surface at the front end of the rear end plate 704, and the other end of the spring abuts against the baffle 102 formed on the inner wall of the housing 1. Therefore, when the front end of the main board 701 is stressed, the main board can move towards the inside of the shell; when the external force is removed, the elastic member 80 moves and resets the main plate 701.

As shown in fig. 12 and 14, during the movement of the main plate 701, the blocking portion 702 on the main plate limits the movement range of the steering switch 40 or drives the steering switch 40 to move to a fixed position. Correspondingly, the steering switch key 40 has a structure corresponding to the blocking portion 702, the steering switch key 40 at least includes a first blocking plate 401 perpendicular to the axis X of the steering switch key 40, when the steering switch key 40 is in the middle position, the first blocking plate 401 is located on one side (shown as the left side in the drawing) of the blocking portion 401, when the steering switch locking member 70 is in the first position, i.e., when the elastic member 80 is in the natural state, the blocking portion 702 is not in contact with the first blocking plate 401 of the steering switch key 40 in the middle position, and the first blocking plate 401 is completely displaced from the blocking portion 702, i.e., the blocking portion 702 is not located on the moving path of the first blocking plate 401, so that the first blocking plate 401 can move freely.

When the steering switch lock 70 is at the second position, the blocking portion 702 moves onto the moving path of the first shutter 401, so that the first shutter 401 defining the steering switch key 40 in the middle position moves to one side from the lock position.

Or the blocking portion 702 is fixed after the first shutter 401 driving the steering switching key 40 in the middle position moves from the middle position to a position on one side thereof during the moving process. At this time, a corresponding inclined surface is required to be provided on the blocking portion 702 so that the first shutter can be driven to move when the first shutter is in contact; of course, in another embodiment, the first blocking plate 401 may be engaged with a sloping plate 402 offset from the blocking portion 702, and the sloping plate 402 is located opposite to the blocking portion 702 when the steering key 40 is at the middle position, so that the blocking portion 702 contacts the sloping plate 402 when moving along the axis Y, and continuously slides inward so that the sloping plate 402 can be driven to finally drive the entire steering key 40 to move from the middle position to one side.

Also, when the steering switch lock 70 is in the first position, the blocking portion 702 is not on the moving path of the swash plate 402, so that it may not restrict the movement of the swash plate 402, and when the blocking portion 702 is moved on the moving path of the swash plate 402, it may restrict the movement of the entire steering switch key 40; as the blocking portion 702 is further moved toward the inside of the housing, the blocking portion 702 may push the swash plate 402 to thereby drive the entire steering switching key 40 to move from the neutral position to one side. This configuration thus effectively meets the requirements of different tool holders for the respective operations, i.e. by moving the blocking portion 702 by different strokes, it is possible to select between two operating states of the steering key 40, in one of which the steering key 40 can be moved between the middle position and the forward position or between the middle position and the reverse position; in another state, the steering key 40 can be in only the forward or reverse rotation position.

Further, the inner end of the first shutter 401 is engaged with a second shutter 403 perpendicular thereto, and the second shutter 403 defines the moving stroke of the steering switch lock 70, that is, when the blocking portion 702 abuts against the second shutter 403, the blocking portion 702 is defined so that the entire steering switch lock 70 cannot move any further.

Further, as shown in fig. 15, the tool rest 90 of the hand tool, which only needs the motor to rotate in one direction, has a driving portion 901 matching with the steering switch locking member 70, that is, the driving portion 901 is provided at the end of the tool rest housing of the tool rest 90 inserted into the housing 1, the driving portion 901 is a driving plate corresponding to the main plate 701, when the tool rest 90 and the housing 1 are integrally connected, the driving portion 901 abuts against the main plate 701 and pushes the main plate 701 to move into the housing, that is, to move from the first position to the second position. Preferably, the tool holder having the driving part 901 is a circular saw tool holder, a grinder tool holder, or a polisher tool holder.

The utility model has a plurality of implementation modes, and all technical schemes formed by adopting equivalent transformation or equivalent transformation all fall within the protection scope of the utility model.

Claims (10)

1. Handheld tool knife rest quick change structure is pegged graft knife rest shell (2) at shell (1) one end opening part including shell (1) and detachably, its characterized in that: a locking ring (3) is arranged in the shell (1) in a rotatable manner, the locking ring (3) is provided with a manual block (31) extending to the outer surface of the shell (1), at least one limiting block (34) is formed at the hole wall of a central through hole (32) of the locking ring (3), the knife rest shell (2) can be inserted into the central through hole (32) of the locking ring (3) and is provided with a stop block (21) corresponding to the limiting block (34), and the limiting block (34) is driven by a deformation mechanism (4) to move between a first position and a second position,

in the first position, the limit block (34) is at least partially overlapped with the projection of the stop block (21) on a plane vertical to the axis of the locking ring (3) and the opposite end surfaces of the limit block and the stop block abut against each other;

in the second position, the stop block (34) is not coincident with the projection of the stop block (21) on a plane perpendicular to the axis of the locking ring (3).

2. The hand tool blade carrier quick-change structure of claim 1, wherein: the inner wall of shell (1) is formed with circular draw-in groove (11), have on locking circle (3) and imbed the round platform in circular draw-in groove (11).

3. The hand tool blade carrier quick-change structure of claim 1, wherein: the side wall of the tool rest shell (2) is provided with a limiting surface (22) which is arranged at the front end of the stop block (21) in a clearance mode, and the width of the limiting block (34) is equivalent to the distance (23) between the stop block (21) and the limiting surface (22).

4. The hand tool blade carrier quick-change structure of claim 3, wherein: the tool holder is characterized in that at least one guide strip (24) extending along the axial direction of the tool holder shell (2) is formed on the peripheral wall of the tool holder shell (2), and a guide groove (12) matched with the guide strip (24) is formed on the inner wall of the shell (1).

5. The hand tool blade carrier quick-change structure of claim 4, wherein: the guide groove (12) is an isosceles trapezoid groove, the width of the opening end of the guide groove is larger than that of the inner end of the guide groove, and the guide strip (24) is consistent with the guide groove in shape.

6. The hand tool blade carrier quick-change structure of claim 1, wherein: the hole wall of the central through hole of the locking ring (3) is coaxially provided with a check ring (35) positioned behind the limiting block (34), the thickness of the check ring (35) is greater than that of the limiting block (34), and the distance between the check ring and the limiting block (34) is not less than the width of the stop block (21).

7. The hand tool blade carrier quick-change structure of claim 6, wherein: an auxiliary limiting ring (6) is coaxially arranged in a central through hole of the locking ring (3), and the end face of the auxiliary limiting ring (6) opposite to the stop block (21) is tightly attached to the stop block (21) in a locking state with the locking ring (3).

8. The quick-change structure of a tool holder of a hand tool according to any one of claims 1 to 7, wherein: the deformation mechanism (4) comprises a tension spring or a torsion spring, wherein at least one end of the deformation mechanism is fixed on the locking ring (3), and the other end of the deformation mechanism is fixed on the shell.

9. The quick-change structure of a tool holder of a hand tool according to any one of claims 1 to 7, wherein: the deformation mechanism (4) comprises two centrosymmetric U-shaped or V-shaped or L-shaped elastic pieces (41, 42).

10. Hand-held tool, its characterized in that: comprising a quick-change structure for a blade holder of a hand tool according to any one of claims 1-9, wherein a motor is arranged in the housing (1) and a rotating shaft thereof is detachably connected with a power output structure arranged in the housing of the blade holder.

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