CN114799331A

CN114799331A - Oblique fracture saw

Info

Publication number: CN114799331A
Application number: CN202210464480.1A
Authority: CN
Inventors: 沈兴祥; 林飞
Original assignee: ZHANGJIAGANG CHUANGJI MACHINERY MANUFACTURING CO LTD
Current assignee: ZHANGJIAGANG CHUANGJI MACHINERY MANUFACTURING CO LTD
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-07-29

Abstract

The invention discloses a miter saw, which comprises: the oblique cutting saw comprises a turntable base with a cutting groove and a support, an oblique cutting saw body hinged on the support and a grab handle fixedly arranged on the oblique cutting saw body, wherein a locking reset structure for keeping the oblique cutting saw body in an upward lifting state is arranged between the support and the oblique cutting saw body; the miter saw body includes: the device comprises a fixed housing, a saw blade movably supported in the fixed housing, a movable housing hinged on the fixed housing, a driving structure for driving the saw blade to rotate and a control system for controlling the driving structure, wherein a trigger switch of the control system is fixedly arranged in an inner cavity of a grab handle, and a double-switch structure for controlling the trigger switch to be opened and closed is arranged on the grab handle; a connecting rod mechanism which can open the movable housing along with the downward swing of the miter saw body and lock the movable housing when the miter saw body is maintained in an upward lifting state is arranged between the movable housing and the fixed housing. The oblique saw with the structure can be suitable for left-hand operation and right-hand operation, and has high safety performance.

Description

Oblique cutting saw

Technical Field

The invention relates to an electric cutting tool, in particular to a miter saw.

Background

The oblique cutting saw is an electric cutting tool capable of positioning a workpiece and performing straight cutting or oblique cutting, and mainly comprises a turntable base with a cutting groove, an oblique cutting saw body and a grab handle fixedly arranged on the oblique cutting saw body, wherein the oblique cutting saw body is hinged on a support of the turntable base, and a locking reset structure which enables the oblique cutting saw body to maintain an upward lifting state and cannot swing downwards around a hinged joint of the oblique cutting saw body and the support under the action of self gravity is arranged between the oblique cutting saw body and the support; the handle is pressed downwards to unlock the locking reset structure, so that the miter saw body swings downwards around a hinged point of the miter saw body and the bracket under the action of pressing force; on the contrary, after the pressing acting force applied to the handle is released, the oblique fracture saw body can be restored and maintained in an upward lifting state through the locking reset structure. The oblique cutting saw body mainly comprises a saw blade, the saw blade movably supported in a fixed housing, a movable housing hinged on the fixed housing, a driving structure for driving the saw blade to rotate and a control system for controlling the driving structure, wherein a main switch of a trigger switch of the triggering control system is usually arranged on a grab handle. The oblique-cutting saw body on one side of the grab handle is also provided with a shifting plate structure for blocking the movable housing from being opened, and the blocking force for blocking the movable housing from being opened can be relieved only by shifting the shifting plate on the shifting plate structure. However, the miter saw of the above-described structure has two main drawbacks: (1) the main switch on the grab handle can be pressed to trigger the trigger switch, so that the trigger switch is easily triggered to start the driving structure due to mistaken touch of the main switch, the saw blade is rotated, and potential safety use hazards exist; (2) the saw blade can be exposed and rotated only by pressing the main switch and simultaneously shifting the shifting plate on the shifting plate structure, so that the saw blade is suitable for right-hand operation, is very inconvenient to use for workers accustomed to left-hand operation, and has potential safety use hazards.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the oblique cutting saw has a simple and compact structure, can be suitable for both left-handed operation and right-handed operation, and is simple and convenient to use. When the oblique cutting saw is in a power-on state, if any switch in the main switch or the button is touched by mistake, the trigger switch cannot be triggered, and the saw blade is always in a static state at the moment.

The miter saw of the present invention comprises: the oblique fracture saw comprises a turntable base with a cutting groove and a support, an oblique fracture saw body hinged on the support and a grab handle fixedly installed on the oblique fracture saw body, wherein a locking reset structure which enables the oblique fracture saw body to maintain an upward lifting state and cannot swing downwards around a hinged point of the oblique fracture saw body and the support under the action of self gravity is arranged between the support and the oblique fracture saw body; on the contrary, after the pressing acting force applied to the handle is released, the oblique fracture saw body can be restored and maintained in an upward lifting state through the locking reset structure. Wherein, oblique fracture saw body includes: the saw blade fixing device comprises a fixing housing, a saw blade movably supported in the fixing housing, a movable housing hinged to the fixing housing, a driving structure for driving the saw blade to rotate and a control system for controlling the driving structure, wherein a trigger switch of the control system is fixedly installed in an inner cavity of a grab handle.

In order to solve the problems in the background art, the invention designs the oblique fracture saw with the structure as follows: the first is that set up the double switch structure that control trigger switch opened and close on the grab handle, trigger switch is triggered through total switch and the button in touching the double switch simultaneously, starts the drive structure, makes the saw bit rotate. Secondly, a connecting rod mechanism is arranged between the movable housing and the fixed housing, and when the miter saw body maintains an upward lifting state, the movable housing is locked at the opening of the fixed housing through the connecting rod mechanism to cover the saw blade exposed at the opening of the fixed housing; in the process that the miter saw body swings downwards around a hinge point of the miter saw body and the support under the pressing action force, the movable housing swings upwards around the hinge point between the movable housing and the fixed housing through the connecting rod mechanism, and the movable housing leaves the opening of the fixed housing.

Further, in the miter saw, the grip is a closed annular housing structure formed by the grip housing and the extension housing which is bent, extended and butted with each other along the left end and the right end of the grip housing, and the trigger switch of the control system is located in the cavity of the grip housing. The double-switch structure is as follows: a mounting seat is arranged in a cavity of the holding shell at the touch key of the trigger switch; a first mounting groove communicated with the cavity of the grab handle is formed in the shell wall on the inner side of the holding shell, a second mounting groove communicated with the cavity of the grab handle is formed in the shell wall on the inner side of the extending shell on the right side of the holding shell, and the first mounting groove and the second mounting groove penetrate to form a complete L-shaped total mounting groove; the bottom of the main switch extends into the first mounting groove, the right end of the main switch extends into the second mounting groove, and the trigger rod at the bottom of the main switch faces to the touch key of the trigger switch; a first limiting structure for preventing the main switch from falling out of the first mounting groove is arranged between the bottom of the main switch and the inner cavity wall of the holding shell at the first mounting groove, and a transverse sliding structure for controlling the moving route of the main switch is arranged between the right end of the main switch and the inner cavity wall of the extending shell at the second mounting groove; at least one transverse spring is arranged between the mounting seat and the bottom of the main switch, and under the elastic force action of each transverse spring, the top of the main switch extends outwards out of the first mounting groove and then is positioned at the position of the maximum extending distance limited by the first limiting structure; a through groove which penetrates from the top end of the mounting seat to the bottom end of the mounting seat is formed in the mounting seat, the sliding plate is movably arranged in the through groove through a vertical sliding structure, a connecting hole which transversely penetrates through the sliding plate and can be used for the trigger rod to extend into is formed in the sliding plate, a button is fixedly arranged at the bottom of the sliding plate, the bottom of the button penetrates through a bottom through hole in the inner cavity wall at the bottom of the holding shell and then extends out of the holding handle, and a second limiting structure which prevents the button from falling out of the holding handle is arranged between the button and the inner cavity wall at the bottom of the holding shell; at least one vertical spring is arranged between the top of the sliding plate and the inner cavity wall of the top of the holding shell, under the elastic force action of each vertical spring, the sliding plate slides to the position of the maximum extending distance of the button, which is limited by the second limiting structure and extends out of the through hole at the bottom, from the top end of the sliding plate to the bottom end of the sliding plate, the connecting hole is located below the contact key of the trigger rod and the trigger switch, the sliding plate blocks the contact key of the trigger rod and the trigger switch, no matter how the main switch is pressed at the moment, the trigger rod can only be pressed on the sliding plate, and the contact key of the trigger switch can not be crossed by the sliding plate. When a user grasps the grab handle and presses the main switch and the button, the sliding plate overcomes the elastic force of the vertical spring to slide upwards to the position, at the same height as the touch key of the trigger switch, of the connecting hole under the action of external force, the main switch overcomes the elastic force of the transverse spring to move from the inner side of the grab handle to the outer side of the grab handle under the action of external force, and the trigger rod penetrates through the connecting hole to contact and press the touch key of the trigger switch to trigger the trigger switch.

First limit structure and second limit structure can adopt multiple structural style, and first limit structure preferred selection is as follows in this scheme: the upper end of the bottom of the main switch is provided with at least two upper limiting blocks which extend upwards out of the upper surface of the main switch, the inner cavity wall of the top of the holding shell positioned at the first mounting groove is provided with an upper limiting groove which prevents each upper limiting block from falling out of the first mounting groove, the lower end of the bottom of the main switch is provided with at least two lower limiting blocks which extend downwards out of the lower surface of the main switch, and the inner cavity wall of the bottom of the holding shell positioned at the first mounting groove is provided with a lower limiting groove which prevents each lower limiting block from falling out of the first mounting groove; under the elastic force effect of each transverse spring, the top of the main switch extends outwards from the first mounting groove until the upper limiting block abuts against the upper limiting groove and the lower limiting block which are arranged above the first mounting groove and abut against the lower limiting groove below the first mounting groove, and then the top of the main switch is located at the position, limited by the first limiting structure, of the maximum extending distance extending out of the first mounting groove.

In the scheme, the second limiting structure preferably selects the following structure: the second limit structure is as follows: the top of the button is provided with a limiting flange protruding outwards, and under the elastic action of each vertical spring, the sliding plate slides to the limiting flange from the top end of the sliding plate to the bottom end direction of the sliding plate and abuts against the inner cavity wall of the holding shell at the bottom through hole, and the button is located at the position of the maximum extending distance, limited by the second limiting structure, extending out of the bottom through hole.

Horizontal sliding structure and vertical sliding structure can adopt multiple structural style, and horizontal sliding structure preferred selection is as follows in this scheme: be provided with the top deflector on the inner chamber wall at the extension casing top that is located second mounting groove department, be provided with the bottom deflector on the inner chamber wall that is located the extension casing bottom of second mounting groove department, the top deflector is parallel with the bottom deflector, be provided with the draw-in groove structure of taking draw-in groove and draw-in groove down at the master switch right-hand member, the activity inlay card of top deflector is in last draw-in groove, the activity inlay card of bottom deflector is under the draw-in groove, master switch can slide along top deflector and bottom deflector through the draw-in groove structure under the exogenic action or the elastic action of each transverse spring.

Vertical sliding structure preferred selection is as follows structure in this scheme: the left vertical clamping groove for clamping the left movable card of the sliding plate is formed in the side wall of the left side of the through groove, the right vertical clamping groove for clamping the right movable card of the sliding plate is formed in the side wall of the right side of the through groove, and the sliding plate can slide in the left vertical clamping groove and the right vertical clamping groove under the action of external force or the elastic force of each vertical spring.

Further, in the miter saw, the number of the transverse springs arranged between the mounting base and the bottom of the main switch is two, and the two transverse springs are mounted in the following manner: the left side and the right side of the through groove positioned on the mounting seat are respectively provided with an embedded groove for the end part of the transverse spring to extend into, the bottom of the main switch is provided with two embedded cylinders for the end part of the transverse spring to extend into, two ends of the two transverse springs respectively extend into the corresponding embedded grooves and the corresponding embedded cylinders, and the two transverse springs are parallel to each other; the quantity of the vertical springs arranged between the top of the sliding plate and the wall of the inner cavity at the top of the holding shell is one, and the installation mode of one vertical spring is as follows: the top of the sliding plate is provided with a vertical connecting rod, the bottom of the vertical spring is sleeved on the vertical connecting rod, and when the button is located at the position of the maximum extending distance, limited by the second limiting structure, extending out of the bottom through hole under the elastic action of the vertical spring, a gap for the sliding plate to move upwards is reserved between the top of the vertical connecting rod and the wall of the inner cavity at the top of the holding shell.

The link mechanism can adopt a plurality of rod piece combination modes, and the link mechanism in the scheme preferably selects the following structure, including: the connecting rod is hinged at the lower part of the fixed encloser, the pin shaft is arranged on the bracket, and the extending arm is formed by extending the edge of the movable encloser at the hinged point of the movable encloser and the fixed encloser to the direction of the fixed encloser; the upper part of the connecting rod and the lower part of the connecting rod are respectively positioned at two sides of a hinge joint of the connecting rod and the fixed housing, an arc-shaped sliding groove is formed in the upper part of the connecting rod, and a sliding block movably placed in the arc-shaped sliding groove is arranged on the extension arm; the pin shaft is provided with a convex ring which protrudes outwards, a top clamping groove for clamping the lower part of the connecting rod is formed among the convex ring, the pin shaft and the support, and the lower part of the connecting rod is clamped in the top clamping groove and then is abutted against the pin shaft between the convex ring and the support.

The main switch and the button are pressed simultaneously, the grab handle is pressed downwards, the locking reset structure is unlocked, the miter saw body swings downwards around a hinge point of the miter saw body and the support under the pressing action force, the movable housing swings upwards around the hinge point between the movable housing and the fixed housing through the connecting rod mechanism, the miter saw leaves the open opening of the fixed housing, the saw blade located at the open opening of the fixed housing is exposed, and at the moment, the exposed saw blade contacts and cuts a workpiece located on the turntable base under the pressing action force. When the thickness of work piece is thick, the bottom edge of the opening of activity housing probably touches the work piece, causes the card to die, damages work piece scheduling problem, therefore this scheme is provided with a pair of gyro wheel at the bottom edge of the opening of activity housing to solve above-mentioned problem.

The invention has the beneficial effects that: firstly, when the oblique cutting saw is in a power-on state, only two switches, namely a main switch and a button, are pressed to trigger a trigger switch, and a driving structure is started to enable a saw blade to rotate; if any switch in the main switch or the button is touched by mistake, the trigger switch cannot be triggered, and the saw blade is always in a static state at the moment; the safety use performance of the oblique cutting saw is improved; secondly, the opening and closing of the movable housing and the swing position of the oblique saw body are bound together through a connecting rod mechanism: when the oblique cutting saw body is kept in an upward lifting state, the movable housing is locked at the opening of the fixed housing through the connecting rod mechanism, and the saw blade exposed at the opening of the fixed housing is covered; the in-process of the pin joint down-swing of oblique fracture saw body around oblique fracture saw body and support under pressing the effort, the activity housing passes through link mechanism and swings upwards around the pin joint between activity housing and the fixed housing, leave the uncovered mouth of fixed housing, the automatic of activity housing is opened and close along with the different realization of the wobbling position of oblique fracture saw body, need not additionally to set up again and need the manual work to go to stir the group board structure that dials that the board just can make the activity housing open, the maloperation phenomenon has been avoided, the safety in use performance of oblique fracture saw has been improved.

Drawings

Fig. 1 is a schematic perspective view of a miter saw according to the present invention.

Fig. 2 is a partial structural schematic view of the grip of fig. 1.

Fig. 3 is a partial structural view of the grip in another viewing orientation.

Fig. 4 is a partial structure diagram of a dual switch structure inside the handle.

Fig. 5 is a partial schematic structure diagram of fig. 4 with the main switch removed.

Fig. 6 is a partial schematic view of the structure of fig. 5 with the slide plate removed.

Fig. 7 is a partial structure diagram between the main switch and the handle.

Fig. 8 is a schematic view of the structure of the slide plate.

FIG. 9 is a schematic view of the movable housing locking cover covering the saw blade.

Fig. 10 is a schematic structural view of the movable cover in an operating state after being opened.

Fig. 11 is a partial structural schematic view on the turntable base.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

Example one

A current miter saw, as shown in fig. 1, 9 and 10, includes: the oblique-cutting saw comprises a turntable base 11 with a cutting groove and a support 12, an oblique-cutting saw body 3 hinged on the support 12 and a grab handle 2 fixedly installed on the oblique-cutting saw body 3, wherein a locking reset structure which enables the oblique-cutting saw body 3 to maintain an upward lifting state and cannot swing downwards around a hinged point of the oblique-cutting saw body 3 and the support 12 under the action of self gravity is arranged between the support 12 and the oblique-cutting saw body 3, and the locking reset structure can be unlocked under the pressing action force of pressing the grab handle 2 downwards so that the oblique-cutting saw body 3 can swing downwards around the hinged point of the oblique-cutting saw body 3 and the support 12 under the pressing action force; on the contrary, when the pressing force applied to the handle 2 is released, the miter saw body 3 can be restored and maintained in the upward lifted state by the lock reset structure. Wherein, oblique fracture saw body 3 includes: the fixed housing 31, the saw bit 32 that the activity supported in fixed housing 31, articulate the movable housing 33 on fixed housing 31, drive saw bit 32 pivoted drive structure and control drive structure's control system, control system's trigger switch 13 fixed mounting is in the inner chamber of grab handle 2, be provided with the master switch of control trigger switch 13 on grab handle 2, press the master switch on grab handle 2 and can trigger switch 13, therefore very easily trigger switch because of mistake touching master switch and start drive structure, make the saw bit rotate, there is the potential safety hazard in use.

The present embodiment is an improvement on the basic oblique fracture saw structure, and a single-switch control trigger switch is changed into a double-switch control trigger switch. In addition, in order to realize the synchronization of the opening and closing of the movable housing 33 and the swing of the miter saw body 3, a link mechanism is arranged between the movable housing 33 and the fixed housing 31, when the miter saw body 3 maintains an upward lifting state, the movable housing 33 is locked at the opening of the fixed housing 31 through the link mechanism, and covers the saw blade 32 exposed at the opening of the fixed housing 31; in the process that the miter saw body 3 swings downwards around the hinge point of the miter saw body 3 and the bracket 12 under the pressing force, the movable housing 33 swings upwards around the hinge point between the movable housing 33 and the fixed housing 31 through the link mechanism, and leaves the opening of the fixed housing 32.

The locking and restoring structure for maintaining the miter saw body 3 in the upward-lifted state without swinging downward around the hinge point of the miter saw body 3 and the bracket 12 under the action of its own weight may employ a torsion spring structure 14, as shown in fig. 11, the miter saw body 3 is maintained in the upward-lifted state by the elasticity of the torsion spring. The grab handle 2 is pressed downwards, the pressing force pressed on the grab handle 2 overcomes the elasticity of the torsion spring 14 and compresses the torsion spring 14, at the moment, the oblique-cutting saw body 3 swings downwards around the hinged point of the oblique-cutting saw body 3 and the support 12 under the pressing action force, so that the oblique-cutting saw body 3 is gradually close to a workpiece arranged on the turntable base 11, and if the driving structure is in a starting state at the moment, the saw blade rotating at high speed can directly cut the workpiece fixed on the turntable base 11.

For the purpose of beveling, as shown in fig. 11, the bracket 12 is designed into a first bracket 121 and a second bracket 123, the second bracket 123 is hinged to the first bracket 121, the miter saw body 3 is hinged to the second bracket 121, the first bracket 121 is provided with a swing arc groove 122 for the miter saw body 3 to swing, and a slider on the second bracket 123 is movably installed in the swing arc groove 122 to adjust an inclination angle of a saw blade in the miter saw body 3 relative to a workpiece, so as to achieve the purpose of beveling.

As shown in fig. 1, 2 and 3, in the present embodiment, the grip 2 is configured as a closed ring-shaped housing structure including a grip housing 21 and an extension housing 22 that is bent and extended along the left and right ends of the grip housing 21, respectively, and then is abutted thereto, and the trigger switch 13 of the control system is located in a cavity of the grip housing 21. For convenience of description, the portion located inside the ring of the grip 2 is defined as the inside of the grip 2, and the portion located outside the ring of the grip 2 is defined as the outside of the grip 2.

As shown in fig. 4, 5 and 6, the dual-switch structure in this embodiment is: a mounting seat 23 is provided in a cavity of the grip housing 21 at the touch key 131 of the trigger switch 13. A first mounting groove 211 communicated with the cavity of the grip handle 2 is formed on the wall of the inner side of the holding shell 21, a second mounting groove 221 communicated with the cavity of the grip handle 2 is formed on the wall of the inner side of the extension shell 22 on the right side of the holding shell 21, and the first mounting groove 211 and the second mounting groove 221 penetrate to form a complete L-shaped overall mounting groove. The bottom of the main switch 51 extends into the first mounting groove 211, the right end of the main switch 51 extends into the second mounting groove 221, and the trigger rod 511 at the bottom of the main switch 51 faces the touch key 131 of the trigger switch 13. A first limit structure for preventing the main switch 51 from falling out of the first mounting groove 211 is arranged between the bottom of the main switch 51 and the inner cavity wall of the holding shell 21 at the first mounting groove 211, and a transverse sliding structure for controlling the moving route of the main switch 51 is arranged between the right end of the main switch 51 and the inner cavity wall of the extension shell 22 at the second mounting groove 221.

As shown in fig. 4, 7 and 8, at least one transverse spring 53 is disposed between the mounting seat 23 and the bottom of the main switch 51, and under the elastic force of each transverse spring 53, the top of the main switch 51 is located at the maximum protruding distance position limited by the first limit structure after protruding outward from the first mounting groove 211. Offer on mount pad 23 by the through groove 231 that the mount pad top runs through to mount pad bottom end direction, slide 7 sets up in leading to the inslot 231 through vertical sliding structure activity, set up transversely to run through and can supply the connecting hole 71 that trigger bar 511 stretched into on slide 7, at the fixed button 52 that is provided with in slide 71 bottom, the button 52 bottom is passed and is stretched out outside the grab handle 2 after gripping the bottom through-hole 212 on the inner chamber wall of casing 21 bottom, be provided with between the inner chamber wall of button 52 and casing 21 bottom and prevent that the button from falling 52 and go out the outer second limit structure of grab handle 2. At least one vertical spring 54 is arranged between the top of the sliding plate 7 and the inner cavity wall of the top of the holding shell 21, under the elastic force of each vertical spring 54, the sliding plate 7 slides from the top end of the sliding plate to the bottom end direction of the sliding plate to the maximum extending distance position of the button 52 outside the through hole of the bottom limited by the second limiting structure, and the connecting hole 71 is positioned below the position between the trigger lever 511 and the touch key 131 of the trigger switch 13. At this time, the sliding plate 7 is blocked between the trigger lever 511 and the touch key 131 of the trigger switch 13, and at this time, the trigger lever 511 can only press against the sliding plate 7 and cannot contact the touch key 131 of the trigger switch 13 beyond the sliding plate 7 no matter how the main switch 51 is pressed.

It should be noted that the upper and lower directions are defined by the position of the miter saw in fig. 9, and all descriptions related to the upper and lower directions shall be regarded as the standard. For example, the top end of the slide 7 is located above the bottom end of the slide 7 with respect to the bottom end of the slide 7, so the direction of movement from the bottom end of the slide 7 to the top end of the slide 7 will be described as upward movement.

When the miter saw is in the power-on state, the main switch 51 and the button 52 need to be pressed by human hands: the button 52 pushes the sliding plate 7 to slide upwards to the same height of the connecting hole 71 between the trigger bar 511 and the touch key 131 of the trigger switch 13 against the elastic force of the vertical spring 54 under the pressing action of a human hand, the main switch 51 overcomes the elastic force of the transverse spring 53 under the pressing action of the human hand to move from the inner side of the grab handle 2 to the outer side of the grab handle 2, the trigger bar 511 passes through the connecting hole 71 to contact and press the touch key 131 of the trigger switch 13 to trigger the trigger switch 13, the driving structure is started, and at the moment, the saw blade 32 rotates. If any one of the main switch 51 or the button 52 is touched by mistake, the trigger switch 13 cannot be triggered due to the double-switch structure, and the saw blade 32 is always in a static state, so that the use safety performance of the miter saw is greatly improved. In addition, the position design of the main switch 51 and the button 52 ensures that the left hand can well grasp and control the main switch 51 and the button 52, and the right hand can also well grasp and control the main switch 51 and the button 52, so that the left hand and the right hand can both well grasp and control the double-switch structure, the use is flexible, and the operation safety performance is greatly improved.

Example two

First limit structure and second limit structure can adopt the common multiple structural style on the market, and this embodiment expandes first limit structure and second limit structure's concrete structure on the basis of embodiment one, selects a more suitable structure, makes whole simple, compact more.

As shown in fig. 4, 5, 6 and 7, the first limiting structure in the present embodiment is preferably selected from the following structures: the upper end of the bottom of the main switch 51 is provided with at least two upper limiting blocks 512 extending upwards out of the upper surface of the main switch, the inner cavity wall of the top of the holding shell 21 positioned at the first mounting groove 211 is provided with an upper limiting groove for preventing each upper limiting block 512 from falling out of the first mounting groove 211, the lower end of the bottom of the main switch 51 is provided with at least two lower limiting blocks 513 extending downwards out of the lower surface of the main switch, and the inner cavity wall of the bottom of the holding shell 21 positioned at the first mounting groove 211 is provided with a lower limiting groove 513 for preventing each lower limiting block 513 from falling out of the first mounting groove 211. Under the elastic force of each transverse spring 53, the top of the main switch 51 extends outwards from the first mounting groove 211 until the upper limiting block 512 abuts against the upper limiting groove above the first mounting groove 211 and the lower limiting block 513 abuts against the lower limiting groove below the first mounting groove 211, and then the top of the main switch 51 is located at the position of the maximum extending distance, which is limited by the first limiting structure and extends out of the first mounting groove 211, of the upper limiting groove and the lower limiting groove.

As shown in fig. 3 and 8, the second limiting structure in the present solution is preferably selected from the following structures: the second limit structure is as follows: the top of the button 52 is provided with a limiting flange 521 protruding outwards, and under the elastic force of each vertical spring 54, the sliding plate 7 slides from the top end of the sliding plate to the bottom end direction of the sliding plate until the limiting flange 521 abuts against the inner cavity wall of the holding shell 21 at the bottom through hole 212, and then the button 52 is located at the maximum protruding distance position which is limited by the second limiting structure and extends out of the bottom through hole.

EXAMPLE III

The transverse sliding structure and the vertical sliding structure can adopt various common structural forms on the market, the embodiment is that the specific structures of the transverse sliding structure and the vertical sliding structure are unfolded on the basis of the first embodiment or the second embodiment, and a more suitable structure is selected, so that the whole structure is simpler and more compact.

As shown in fig. 4, 5 and 7, the lateral sliding structure in the present embodiment is preferably selected from the following structures: the inner cavity wall at the top of the extension shell 22 at the second mounting groove 221 is provided with a top guide plate, the inner cavity wall at the bottom of the extension shell 22 at the second mounting groove 221 is provided with a bottom guide plate 24, the top guide plate is parallel to the bottom guide plate 24, the right end of the main switch 51 is provided with a clamping groove structure with an upper clamping groove 514 and a lower clamping groove 515, the top guide plate is movably clamped and embedded in the upper clamping groove 514, the bottom guide plate 24 is movably clamped and embedded in the lower clamping groove 515, and the main switch 51 can slide along the top guide plate and the bottom guide plate 24 through the clamping groove structure under the action of external force or the elastic force of each transverse spring 53.

As shown in fig. 5 and 6, the vertical sliding structure in the present embodiment is preferably selected from the following structures: a left vertical clamping groove for clamping the left movable part of the sliding plate 7 is formed in the left side wall of the through groove 231, a right vertical clamping groove 233 for clamping the right movable part of the sliding plate 7 is formed in the right side wall of the through groove 7, and the sliding plate 7 can slide in the left vertical clamping groove and the right vertical clamping groove 233 under the action of external force or the elastic force of each vertical spring 54.

In addition, this embodiment expandes the quantity and the mounting means of horizontal spring 53 and vertical spring 54 on this basis, selects a more suitable mounting means, makes things convenient for the installation and the change of horizontal spring 53, vertical spring 54, can make overall structure simpler, compact again, uses more reliably.

The number of the transverse springs 53 arranged between the mounting base 23 and the bottom of the main switch 51 is two, and the mounting modes of the two transverse springs 53 are as follows: the left side and the right side of the through groove 231 of the mounting seat 23 are respectively provided with an embedded groove 232 into which the end part of the transverse spring 53 extends, the bottom of the main switch 51 is provided with two embedded cylinders 516 into which the end part of the transverse spring 53 extends, two ends of two transverse springs 53 respectively extend into the corresponding embedded grooves 232 and the corresponding embedded cylinders 516, and the two transverse springs 53 are parallel to each other.

The number of the vertical springs 54 arranged between the top of the sliding plate 7 and the inner cavity wall of the top of the holding shell 21 is one, and the installation mode of one vertical spring 54 is as follows: the top of the sliding plate 7 is provided with a vertical connecting rod 73, the bottom of the vertical spring 54 is sleeved on the vertical connecting rod 73, and when the button 52 is located at the position of the maximum extending distance outside the through hole 212 at the bottom, which is limited by the second limiting structure, under the elastic action of the vertical spring 54, a gap for the sliding plate 7 to move upwards is reserved between the top of the vertical connecting rod 73 and the inner cavity wall at the top of the holding shell 21.

Example four

The link mechanism may adopt a plurality of rod assembly manners, and in this embodiment, the structure of the link mechanism is described in detail based on the first embodiment, the second embodiment, or the third embodiment.

As shown in fig. 9, 10 and 11, the link mechanism according to the present embodiment preferably includes: a connecting rod 6 hinged at the lower part of the fixed cover shell 31, a pin shaft 8 arranged on the bracket 12 and an extension arm 331 formed by extending towards the direction of the fixed cover shell along the edge of the movable cover shell at the hinged point of the movable cover shell 33 and the fixed cover shell 31. The upper part of the connecting rod 6 and the lower part of the connecting rod are respectively positioned at two sides of a hinge point of the connecting rod 6 and the fixed housing 31, an arc-shaped sliding groove 61 is arranged at the upper part of the connecting rod 6, and a sliding block 332 movably placed in the arc-shaped sliding groove 61 is arranged on the extension arm 331. The pin shaft 8 is provided with a convex ring 81 protruding outwards, a top clamping groove 7 for clamping the lower part of the connecting rod 6 is formed among the convex ring 81, the pin shaft 8 and the support 12, and the lower part of the connecting rod 6 is clamped into the top clamping groove 7 and then is abutted against the pin shaft 8 between the convex ring 81 and the support 12.

The handle 2 is pressed downwards, the locking reset structure is unlocked, the miter saw body 3 swings downwards around a hinge point between the miter saw body 3 and the support 12 under the pressing action force, the movable housing 33 swings upwards around the hinge point between the movable housing 33 and the fixed housing 31 through the link mechanism, the movable housing 33 leaves an open opening of the fixed housing 31, a saw blade 32 located at the open opening of the fixed housing 31 is exposed, and in the process, the lower part of the connecting rod 6 always abuts against the pin shaft 8 between the convex ring 81 and the support 12.

Simultaneously, the main switch 51 and the button 52 are pressed, the trigger switch 13 is triggered to start the driving structure, the exposed saw blade 32 rotates at a high speed, and the saw blade 32 rotating at a high speed contacts and cuts a workpiece fixed on the turntable base 11 under the pressing action force. When the thickness of the workpiece is thick, the bottom edge of the opening of the movable housing 33 may touch the workpiece, which may cause the workpiece to be jammed and damaged, and thus the present solution provides a pair of rollers 34 at the bottom edge of the opening of the movable housing 33 to solve the above-mentioned problems.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made in accordance with the technical spirit of the present invention are within the scope of the present invention as claimed.

Claims

1. A miter saw, comprising: the inclined cutting saw comprises a turntable base with a cutting groove and a support, an inclined cutting saw body hinged on the support and a grab handle fixedly installed on the inclined cutting saw body, wherein a locking reset structure which enables the inclined cutting saw body to maintain an upward lifting state is arranged between the support and the inclined cutting saw body; the oblique fracture saw body includes: fixed housing, activity support in fixed housing the saw bit, articulate the control system of activity housing, drive saw bit pivoted drive structure and control drive structure on fixed housing, control system's trigger switch fixed mounting is in the inner chamber of grab handle, its characterized in that: a double-switch structure for controlling the on-off of the trigger switch is arranged on the grab handle; a connecting rod mechanism is arranged between the movable housing and the fixed housing, and when the oblique cutting saw body maintains an upward lifting state, the movable housing is locked at the opening of the fixed housing through the connecting rod mechanism, and the saw blade exposed at the opening of the fixed housing is covered; in the process that the miter saw body swings downwards around the hinge point of the miter saw body and the support under the pressing action force, the movable housing swings upwards around the hinge point between the movable housing and the fixed housing through the connecting rod mechanism, and the movable housing leaves the opening of the fixed housing.

2. The miter saw of claim 1, wherein: the grab handle is a closed annular shell structure formed by a holding shell and an extending shell which is respectively bent, extended and butted along the left end and the right end of the holding shell, and a trigger switch of the control system is positioned in a cavity of the holding shell; the double-switch structure is as follows: a mounting seat is arranged in a cavity of the holding shell at the touch key of the trigger switch; a first mounting groove communicated with the cavity of the grab handle is formed in the shell wall on the inner side of the holding shell, a second mounting groove communicated with the cavity of the grab handle is formed in the shell wall on the inner side of the extending shell on the right side of the holding shell, and the first mounting groove and the second mounting groove penetrate to form a complete L-shaped total mounting groove; the bottom of the main switch extends into the first mounting groove, the right end of the main switch extends into the second mounting groove, and the trigger rod at the bottom of the main switch faces to the touch key of the trigger switch; a first limiting structure for preventing the main switch from falling out of the first mounting groove is arranged between the bottom of the main switch and the inner cavity wall of the holding shell at the first mounting groove, and a transverse sliding structure for controlling the moving route of the main switch is arranged between the right end of the main switch and the inner cavity wall of the extending shell at the second mounting groove; at least one transverse spring is arranged between the mounting seat and the bottom of the main switch, and under the elastic force action of each transverse spring, the top of the main switch extends outwards out of the first mounting groove and then is positioned at the position of the maximum extending distance limited by the first limiting structure; a through groove which penetrates from the top end of the mounting seat to the bottom end of the mounting seat is formed in the mounting seat, the sliding plate is movably arranged in the through groove through a vertical sliding structure, a connecting hole which transversely penetrates through the sliding plate and can be used for the trigger rod to extend into is formed in the sliding plate, a button is fixedly arranged at the bottom of the sliding plate, the bottom of the button penetrates through a bottom through hole in the inner cavity wall at the bottom of the holding shell and then extends out of the holding handle, and a second limiting structure which prevents the button from falling out of the holding handle is arranged between the button and the inner cavity wall at the bottom of the holding shell; at least one vertical spring is arranged between the top of the sliding plate and the inner cavity wall of the top of the holding shell, under the elastic force action of each vertical spring, the sliding plate slides from the top end of the sliding plate to the bottom end of the sliding plate to the position of the maximum extending distance of the button, which is limited by the second limiting structure and extends out of the through hole at the bottom, and the connecting hole is positioned below the contact key of the trigger rod and the trigger switch.

3. The miter saw of claim 2, wherein: first limit structure do: the upper end of the bottom of the main switch is provided with at least two upper limiting blocks which extend upwards out of the upper surface of the main switch, the inner cavity wall of the top of the holding shell positioned at the first mounting groove is provided with an upper limiting groove which prevents each upper limiting block from falling out of the first mounting groove, the lower end of the bottom of the main switch is provided with at least two lower limiting blocks which extend downwards out of the lower surface of the main switch, and the inner cavity wall of the bottom of the holding shell positioned at the first mounting groove is provided with a lower limiting groove which prevents each lower limiting block from falling out of the first mounting groove; under the elastic force action of each transverse spring, the top of the main switch extends outwards from the first mounting groove until the upper limiting block abuts against the upper limiting groove and the lower limiting block which are arranged above the first mounting groove and abut against the lower limiting groove which is arranged below the first mounting groove, and then the top of the main switch is positioned at the position which is limited by the first limiting structure and extends out of the first mounting groove and has the maximum extending distance; the second limit structure is as follows: the top of the button is provided with a limiting flange protruding outwards, and under the elastic action of each vertical spring, the sliding plate slides to the limiting flange from the top end of the sliding plate to the bottom end direction of the sliding plate and abuts against the inner cavity wall of the holding shell at the bottom through hole, and the button is located at the position of the maximum extending distance, limited by the second limiting structure, extending out of the bottom through hole.

4. A miter saw as claimed in claim 2 or 3, wherein: the transverse sliding structure is as follows: a top guide plate is arranged on the inner cavity wall of the top of the extension shell positioned at the second mounting groove, a bottom guide plate is arranged on the inner cavity wall of the bottom of the extension shell positioned at the second mounting groove, the top guide plate is parallel to the bottom guide plate, a clamping groove structure with an upper clamping groove and a lower clamping groove is arranged at the right end of the main switch, the top guide plate is movably clamped and embedded in the upper clamping groove, the bottom guide plate is movably clamped and embedded in the lower clamping groove, and the main switch can slide along the top guide plate and the bottom guide plate through the clamping groove structure under the action of external force or the elastic force of each transverse spring; the vertical sliding structure is as follows: the left vertical clamping groove for clamping the left movable card of the sliding plate is formed in the side wall of the left side of the through groove, the right vertical clamping groove for clamping the right movable card of the sliding plate is formed in the side wall of the right side of the through groove, and the sliding plate can slide in the left vertical clamping groove and the right vertical clamping groove under the action of external force or the elastic force of each vertical spring.

5. A miter saw as claimed in claim 2 or 3, wherein: the quantity of the transverse springs arranged between the mounting seat and the bottom of the main switch is two, and the mounting modes of the two transverse springs are as follows: the left side and the right side of the through groove positioned on the mounting seat are respectively provided with an embedded groove for the end part of the transverse spring to extend into, the bottom of the main switch is provided with two embedded cylinders for the end part of the transverse spring to extend into, two ends of the two transverse springs respectively extend into the corresponding embedded grooves and the corresponding embedded cylinders, and the two transverse springs are parallel to each other; the quantity of the vertical springs arranged between the top of the sliding plate and the wall of the inner cavity at the top of the holding shell is one, and the installation mode of one vertical spring is as follows: the top of the sliding plate is provided with a vertical connecting rod, the bottom of the vertical spring is sleeved on the vertical connecting rod, and when the button is located at the position of the maximum extending distance, limited by the second limiting structure, extending out of the bottom through hole under the elastic action of the vertical spring, a gap for the sliding plate to move upwards is reserved between the top of the vertical connecting rod and the wall of the inner cavity at the top of the holding shell.

6. A miter saw according to claim 1 or 2, wherein: the link mechanism includes: the connecting rod is hinged at the lower part of the fixed encloser, the pin shaft is arranged on the bracket, and the extending arm is formed by extending the edge of the movable encloser at the hinged point of the movable encloser and the fixed encloser to the direction of the fixed encloser; the upper part of the connecting rod and the lower part of the connecting rod are respectively positioned at two sides of a hinge joint of the connecting rod and the fixed housing, an arc-shaped sliding groove is formed in the upper part of the connecting rod, and a sliding block movably placed in the arc-shaped sliding groove is arranged on the extension arm; the pin shaft is provided with a convex ring which protrudes outwards, a top clamping groove for clamping the lower part of the connecting rod is formed among the convex ring, the pin shaft and the support, and the lower part of the connecting rod is clamped in the top clamping groove and then is abutted against the pin shaft between the convex ring and the support.

7. A miter saw according to claim 1 or 2, wherein: a pair of rollers is arranged at the bottom end edge of the opening of the movable housing.