CN212367910U

CN212367910U - Safety starting mechanism of grass trimmer

Info

Publication number: CN212367910U
Application number: CN202020901196.2U
Authority: CN
Inventors: 王成; 吴波; 熊晓华; 冉启舸
Original assignee: Chongqing Dajiang Power Equipment Manufacturing Co ltd
Current assignee: Chongqing Dajiang Power Equipment Manufacturing Co ltd; Chongqing Dajiang Power Equipment Co Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-01-19
Anticipated expiration: 2030-05-26

Abstract

A safe starting mechanism of a grass trimmer comprises a switch box, a limit button, a switch button and a microswitch; the limit button comprises a limit handle and a limit hook fixedly connected with the limit handle, the limit handle extends out of the switch box, and the limit button is rotatably arranged in the switch box at the joint of the limit hook and the limit handle; the switch key comprises a switch handle and a pressing arm fixedly connected with the switch handle, the switch handle extends out of the switch box, and the switch key is rotatably arranged in the switch box at the joint of the pressing arm and the switch handle; the pressure arm and the limit hook form an up-and-down interlocking structure through rotation; the microswitch is fixed on the lower side of the rotating path of the pressure arm; a manual button is also arranged in the switch box, and the manual button and the microswitch are connected with a starting circuit of the grass trimmer in series. Through setting up these three start actions, further reduced the probability that the quick-witted cutter of grass was started by mistake, improved the operational safety.

Description

Safety starting mechanism of grass trimmer

Technical Field

The utility model relates to a grass trimmer technical field specifically is a grass trimmer safety starting mechanism.

Background

A lawn mower is a hand-held tool used for cutting weeds in lawns, gardens, pastures and the like. Generally comprises a front-mounted or rear-mounted power mechanism, a chopping mechanism and a transmission mechanism connecting the power mechanism and the chopping mechanism. The cutting mechanism comprises a cutter, a cutter head support and a protective cover on the upper part of the cutter head. When the weed cutting machine works, the power of the power machine component is transmitted to the cutting mechanism through the power of the transmission machine component, so that the cutter rotates at a high speed to cut weeds. The protective cover on the upper portion of the cutter head plays a role in preventing the cutter from cutting a user in the working process, but when the grass trimmer is started by mistake, the user is relieved from the protection, and the cutter has the potential safety hazard of mistakenly hurting people.

In order to avoid false touch, the invention patent with application number 2014105110830 in the prior art discloses a grass trimmer, and discloses a main control trigger and a speed regulation trigger; the main control trigger and the speed regulation trigger are exposed out of two sides of the handle shell, the main control trigger and the speed regulation trigger can be simultaneously operated by one hand, and the speed regulation trigger can trigger the speed regulation switch to regulate the speed only when the main control trigger triggers the main control switch to conduct the power supply circuit; through the interlocking structure of the main control trigger and the speed regulation trigger, the power supply sequence accords with the on-off sequence of current, and a user is protected.

However, the double-trigger arrangement still has the possibility of mistaken touch, namely when a user subconsciously presses the main control trigger and the speed regulating trigger simultaneously, the sudden start of the grass trimmer still has the potential safety hazard of hurting people.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a quick-witted safe starting mechanism beats grass, its operation security performance is higher, can more effectively avoid the mistake to start producing.

In order to realize the purpose, the following technical scheme is provided:

a safe starting mechanism of a grass trimmer comprises a switch box, a limit button, a switch button and a microswitch; the limit button comprises a limit handle and a limit hook fixedly connected with the limit handle, the limit handle extends out of the switch box, and the limit button is rotatably arranged in the switch box at the joint of the limit hook and the limit handle; the switch key comprises a switch handle and a pressing arm fixedly connected with the switch handle, the switch handle extends out of the switch box, and the switch key is rotatably arranged in the switch box at the joint of the pressing arm and the switch handle; the pressure arm and the limit hook form an up-and-down interlocking structure through rotation; the microswitch is fixed on the lower side of the rotating path of the pressure arm; a transverse mounting groove is further formed in the switch box, a manual button is arranged in the transverse mounting groove, and a button opening is formed in the shell of the switch box opposite to the manual button; the manual button and the microswitch are connected with the starting circuit of the grass trimmer in series.

The utility model discloses a theory of operation and theory of use lie in: the switch box is a starting and stopping mechanism for controlling the rotation of the mower cutter, a limit button and a switch button are arranged in the switch box, when the switch box is not started, the limit handle and the switch handle are respectively tilted upwards and downwards, and a limit hook positioned in the switch box hooks the pressure arm, so that the pressure arm is far away from the elastic button on the microswitch and is locked; when the cutter of the grass mower is started, the limiting handle needs to be pressed downwards to enable the limiting hook to be lifted upwards, the limiting hook is separated from the pressing arm, the switch key is in an unlocking state, the switch handle is pulled upwards to enable the pressing arm to be pressed downwards, and the elastic key of the microswitch is pressed downwards to be started; and finally, pressing a manual button from a button opening on the switch box to enable the starting circuit of the grass trimmer to complete the path, and enabling the cutter to start rotating, or firstly pressing the manual button, and then sequentially pressing the limiting handle and the switch handle to realize that the starting circuit of the grass trimmer completes the path and the cutter starts rotating. When the grass trimmer is closed, the manual button can be pressed down or the switch handle and the limiting handle can be loosened in sequence, the limiting hook hooks the pressing arm again to enter a locking state, so that the starting circuit of the grass trimmer is disconnected, and the cutter stops rotating.

The utility model has the beneficial technical effects that: when the mower cutter is started, the manual button, the limit button and the switch button need to be opened, and the probability of false starting of the mower cutter is further reduced through three starting actions, so that the operation safety is improved.

Drawings

FIG. 1 is a schematic view of the structure of the locking state of the limit button and the switch button in the safety starting mechanism of the grass trimmer of the present invention.

FIG. 2 is a schematic view of the structure of the unlocking state of the limit button and the switch button in the safety starting mechanism of the grass trimmer of the present invention.

In the figure: 1. a switch box; 2. a switch box handle; 3. a limit key; 301. a limiting handle; 302. a limiting hook; 303. a first rotating drum; 304. a first rotating shaft; 4. switching a key; 401. a switch handle; 402. pressing the arm; 403. a second rotating drum; 404. a second rotating shaft; 5. a microswitch; 6. an upper key aperture; 7. a lower key-press opening; 8. A transverse mounting groove; 9. a manual button; 10. a button opening; 11. a spring receiving cavity; 12. a compression spring; 13. a first bevel; 14. a bayonet; 15. a second bevel; 16. clamping ribs; 17. avoiding a gap; 18. a limiting member; 19. and (5) fixing the column.

Detailed Description

The following will explain the safety starting mechanism of the grass trimmer according to the present invention with reference to the drawings and the specific embodiments.

A safe starting mechanism of a grass trimmer comprises a switch box 1, a limit key 3, a switch key 4 and a microswitch 5, wherein the rear part of the switch box 1 is respectively provided with an upper key opening 6 and a lower key opening 7; the limit key 3 comprises a limit handle 301 and a limit hook 302 fixedly connected with the limit handle 301, the limit handle 301 extends out of the switch box 1 at the upper key opening 6, and the limit key 3 is rotatably arranged in the switch box 1 at the connection part of the limit hook 302 and the limit handle 301; the switch button 4 comprises a switch handle 401 and a pressing arm 402 fixedly connected with the switch handle 401, the switch handle 401 extends out of the switch box 1 at the lower button hole 7, and the switch button 4 is rotatably arranged in the switch box 1 at the connection part of the pressing arm 402 and the switch handle 401; the pressing arm 402 and the limiting hook 302 form an up-and-down interlocking structure through rotation; the microswitch 5 is fixed on the lower side on the rotation path of the pressing arm 402; a transverse mounting groove 8 is further formed in the switch box 1, a manual button 9 is arranged in the transverse mounting groove 8, and a button opening 10 is formed in a shell of the switch box 1 opposite to the manual button 9; the manual button 9 is exposed out of the button opening 10 for the user to press. The manual button 9 may be fixed in the lateral mounting groove 8 by means of screws. The manual button 9, the microswitch 5 and the grass trimmer starting circuit are connected in series

The switch box 1 is a starting and stopping mechanism for controlling the rotation of the grass trimmer cutter, and the switch box handle 2 is connected with the rear end of the switch box; a limit button 3 and a switch button 4 are arranged in the switch box 1, when the switch box is not started, the limit handle 301 and the switch handle 401 respectively tilt up and down, and the limit hook 302 positioned in the switch box 1 hooks the press arm 402, so that the press arm 402 is far away from the elastic button on the micro switch 5 and is locked; when the cutter of the grass mower is started, the limiting handle 301 needs to be pressed downwards firstly, the limiting hook 302 is lifted upwards, the limiting hook 302 is separated from the pressing arm 402, the switch button 4 is in an unlocking state, the switch handle 401 is pulled upwards, the pressing arm 402 is pressed downwards, and the elastic button of the microswitch 5 is pressed downwards for starting; and finally, pressing the manual button 9 on the switch box 1 to enable the starting circuit of the grass trimmer to complete the access, and enabling the cutter to start rotating, or firstly pressing the manual button 9, and then sequentially pressing the limiting handle 301 and the switch handle 401 to achieve the purpose that the starting circuit of the grass trimmer completes the access, and the cutter starts rotating. When the grass cutter is closed again, the manual button 9 is pressed down or the switch handle 401 and the limit handle 301 are sequentially loosened, the limit hook 302 hooks the press arm 402 again to enter a locking state, so that a starting circuit of the grass cutter is disconnected, and the cutter stops rotating.

By setting three starting actions of the manual button 9, the limit key 3 and the switch key 4, the probability of false starting of the mower cutter is further reduced, and the operation safety is improved.

In this embodiment, a first rotating barrel 303 is disposed between the limiting handle 301 and the limiting hook 302, and the first rotating barrel 303, the limiting handle 301 and the limiting hook 302 are integrally formed; a first rotating shaft 304 matched with the first rotating drum 303 is fixed on the side wall of the upper part of the switch box 1, and the first rotating drum 303 is sleeved on the first rotating shaft 304 so that the limit key 3 can rotate around the first rotating shaft 304; a second rotary drum 403 is arranged between the switch handle 401 and the press arm 402, and the second rotary drum 403, the switch handle 401 and the press arm 402 are of an integrally formed structure; a second rotating shaft 404 matched with the second rotating drum 403 is fixed on the side wall of the lower part of the switch box 1, and the second rotating drum 403 is sleeved on the second rotating shaft 404 so that the switch key 4 can rotate around the second rotating shaft 404; therefore, the limit key 3 and the switch key 4 are switched between a locking state and an unlocking state.

In this embodiment, the microswitch 5 is of the type of a single sided type microswitch 5.

Further, the upper part of the limit hook 302 is connected with the inner top of the switch box 1 through a compression spring 12; the end of the limiting hook 302 is provided with a first bevel 13, one side of the end of the pressing arm 402 is provided with a bayonet 14 matched with the bevel, and the end of the pressing arm 402 is provided with a second bevel 15 matched with the first bevel 13.

There is certain clearance between the circle of compression spring 12, and when spacing handle 301 pushed down, spacing collude 302 upwards lifted, extrudees compression spring 12, and compression spring 12 receives the spring contraction deformation when external load, stores the deformability, is in the unblock state between spacing collude 302 and the pressure arm 402 simultaneously. When the hand leaves the limit handle 301, the compression spring 12 presses the limit hook 302 downwards due to elastic stress, and meanwhile, due to the fact that the first bevel 13 of the limit hook 302 is in an abutting state with the second bevel 15 of the press arm 402, the second bevel 15 of the press arm 402 is pressed under the action of downward movement of the limit hook 302, so that the press arm 402 is lifted upwards, and then the limit hook 302 hooks the bayonet 14 of the press arm 402, so that the limit key 3 and the switch key 4 are in a locking state.

Through the arrangement, when the hand of an operator leaves the limit key 3 and the switch key 4, the limit key 3 and the switch key 4 can automatically enter a locking state and reset; simple structure, simple operation moreover.

Furthermore, the inner wall of the transverse mounting groove 8 is provided with a clamping rib 16, and the manual button 9 is clamped and fixed in the transverse mounting groove 8 through the clamping rib 16. The clamping ribs 16 are arranged at the upper part and the lower part of the transverse mounting groove 8 and are integrally molded with the switch box 1; the manual button 9 includes a circuit board and a switch, and the circuit board is inserted into a gap between the upper and lower clamping ribs 16 to achieve the purpose of fixing the manual button 9. In this embodiment, the manual button 9 is an ohigh key switch, and has a specification of 12mm × 12mm, an operating voltage of 12V, and an operating current of 0.2A.

Further, the inner sides of the limit handle 301 and the switch handle 401 are both provided with clearance gaps 17. The position of the clearance gap 17 is matched with the upper key opening 6 or the lower key opening 7, which is beneficial to reducing the sizes of the openings of the upper key opening 6 and the lower key opening 7 and simultaneously avoiding the interference between the limit handle 301 and the switch handle 401 and the shell of the switch box 1.

Further, a spring accommodating cavity 11 formed by two vertical ribs is arranged on the side wall of the switch box 1 at the top of the limiting hook 302, and the compression spring 12 is placed in the spring accommodating cavity 11. Spring holds chamber 11 and has been used for placing compression spring 12, and two perpendicular muscle can also play the effect to the rotation stroke restriction of spacing collude 302.

Further, the upper portion of the limiting hook 302 is further provided with a limiting member 18. The limiting member 18 is an upward arc for limiting the rotation of the limiting hook 302.

Claims

1. A safe starting mechanism of a grass trimmer comprises a switch box (1), a limit button (3), a switch button (4) and a microswitch (5); the limiting button (3) comprises a limiting handle (301) and a limiting hook (302) fixedly connected with the limiting handle (301), the limiting handle (301) extends out of the switch box (1), and the limiting button (3) is rotatably arranged in the switch box (1) at the connecting part of the limiting hook (302) and the limiting handle (301); the switch button (4) comprises a switch handle (401) and a pressing arm (402) fixedly connected with the switch handle (401), the switch handle (401) extends out of the switch box (1), and the switch button (4) is rotatably arranged in the switch box (1) at the connection part of the pressing arm (402) and the switch handle (401); the pressing arm (402) and the limiting hook (302) form an up-and-down interlocking structure through rotation; the microswitch (5) is fixed on the lower side of the rotating path of the pressure arm (402); the switch box is characterized in that a transverse mounting groove (8) is further formed in the switch box (1), a manual button (9) is arranged in the transverse mounting groove (8), and a button opening (10) is formed in a shell of the switch box (1) opposite to the manual button (9); the manual button (9) and the microswitch (5) are connected with the starting circuit of the grass trimmer in series.

2. The safe starting mechanism of the grass trimmer according to the claim 1, characterized in that the upper part of the limit hook (302) is connected with the inner top of the switch box (1) through a compression spring (12); the tip of spacing collude (302) is equipped with first oblique angle (13), and one side of pressing arm (402) tip is equipped with bayonet socket (14) with oblique angle assorted, presses arm (402) tip to be equipped with first oblique angle (13) matched with second oblique angle (15).

3. The safe starting mechanism of the grass trimmer according to the claim 1 or 2, characterized in that the inner wall of the transverse mounting groove (8) is provided with a clamping rib (16), and the manual button (9) is clamped in the transverse mounting groove (8) through the clamping rib (16).

4. A safety actuating mechanism of a grass cutter as claimed in claim 1 or 2, wherein the inner sides of the limit handle (301) and the switch handle (401) are provided with clearance gaps (17).

5. A safety actuating mechanism of a grass trimmer according to claim 3, characterized in that the inner sides of the limit handle (301) and the switch handle (401) are provided with clearance gaps (17).

6. The safety starting mechanism of the grass trimmer according to the claim 1, 2 or 5, characterized in that the side wall of the switch box (1) at the top of the limit hook (302) is provided with a spring accommodating cavity (11) formed by two vertical ribs, and the compression spring (12) is placed in the spring accommodating cavity (11).

7. A safety actuating mechanism of a grass cutter as claimed in claim 3, characterized in that a spring accommodating chamber (11) formed by two vertical ribs is provided on the side wall of the switch box (1) at the top of the limit hook (302), and the compression spring (12) is placed in the spring accommodating chamber (11).

8. The safety starting mechanism of the grass trimmer according to claim 4, characterized in that a spring accommodating cavity (11) formed by two vertical ribs is arranged on the side wall of the switch box (1) at the top of the limiting hook (302), and the compression spring (12) is placed in the spring accommodating cavity (11).