CN108781713B

CN108781713B - Walk-behind self-propelled machine

Info

Publication number: CN108781713B
Application number: CN201710301318.7A
Authority: CN
Inventors: 严语; 许海深; 刘扬子
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2017-05-02
Filing date: 2017-05-02
Publication date: 2020-12-01
Anticipated expiration: 2037-05-02
Also published as: CN108781713A

Abstract

The invention discloses a walk-behind self-propelled machine, comprising: a chassis; wheels for supporting the chassis and rotating relative to the chassis; the driving motor drives the wheels to rotate; a handle for the walk-behind self-propelled machine to be pushed by a user, the handle forming a gripping portion for the user to grip; a starting trigger for a user to operate and start the driving motor; the starting trigger is arranged on the holding part; the start trigger includes an operation portion; the operation part can be operated by a hand of a user holding the holding part to move forwards to start the driving motor when holding the holding part. The user of the walk-behind self-propelled machine disclosed by the invention can conveniently and quickly start and close the starting trigger when holding the holding part.

Description

Walk-behind self-propelled machine

Technical Field

The invention relates to a walk-behind self-propelled machine.

Background

The walk-behind self-propelled machine includes a drive motor and wheels. The driving motor drives the wheels to rotate, so that the walk-behind self-propelled machine advances on the ground, and the self-propelled function is realized. The walk-behind self-propelled machine includes a handle. The handle is arranged at the rear part of the backward-walking self-propelled machine, the backward-walking self-propelled machine moves forwards, and a user is positioned at the rear part of the backward-walking self-propelled machine and holds the handle to operate and control the backward-walking self-propelled machine.

Mowers and snowplows having self-propelled functionality are common walk-behind self-propelled machines.

The backward-walking self-propelled machine is provided with a speed regulating part and a starting trigger. The speed regulating part is used for controlling the advancing speed of the backward-moving self-propelled machine. The start trigger is used to start the travel function of the walk-behind self-propelled machine.

The speed regulating part of the existing backward-walking self-propelled machine is inconvenient for users to regulate the speed when holding the handle.

Existing walk-behind self-propelled machines do not facilitate a user quickly switching between turning off the travel function, pulling the machine backwards, and activating the travel function.

Disclosure of Invention

In order to solve the disadvantages of the prior art, an object of the present invention is to provide a walk-behind self-propelled machine that can conveniently control a driving motor when a user holds a handle.

In order to achieve the above object, the present invention adopts the following technical solutions:

a walk-behind self-propelled machine comprising: a chassis; wheels for supporting the chassis and rotating relative to the chassis; the driving motor drives the wheels to rotate; a handle for the walk-behind self-propelled machine to be pushed by a user, the handle forming a gripping portion for the user to grip; a starting trigger for a user to operate and start the driving motor; the starting trigger is arranged on the holding part; the start trigger includes an operation portion; the operation part can be operated by a hand of a user holding the holding part to move forwards to start the driving motor when holding the holding part.

Further, the starting trigger comprises an operating part protruding backwards from the handle;

further, the walk-behind self-propelled machine further includes: the starting switch can be controlled by the starting trigger and used for starting the driving motor, and the starting switch is electrically connected with the driving motor; the starting switch is arranged in the handle.

Further, the walk-behind self-propelled machine includes two start-up triggers; the handle forms two holding parts; the two holding parts are symmetrical about a symmetrical plane; the two activation triggers are symmetrical about a plane of symmetry.

Further, the walk-behind self-propelled machine further comprises a work motor: a working attachment driven by a working motor to perform a function of a walk-behind self-propelled machine; a working trigger for starting the working motor; the working trigger comprises a movable part for the operation of a user; the movable part is arranged in front of the handle and can be operated by a user to move backwards to start the working motor; the holding portion, the movable portion, and the operation portion can be held by a single hand of a user.

Further, the grip portion includes: a first grip portion extending along a straight line; a second grip portion extending along a straight line; a connecting portion connecting the first grip portion and the second grip portion; the first holding part, the second holding part and the connecting part form an L shape; the starting trigger is arranged on the first holding part and the connecting part.

Further, the activation trigger is pivotally coupled to the handle.

Further, the maximum distance from any point on the activation trigger to the handle is less than or equal to 20 mm.

Further, the handle forms two gripping portions; the two holding parts are symmetrical about a symmetrical plane; the walk-behind self-propelled machine further comprises: a speed regulating member moving relative to the handle to regulate a rotational speed of the driving motor; the speed regulating part can be operated by a user when holding the holding part with one hand; the speed regulating part is arranged between the two holding parts; the speed regulating member is rotatably connected to the handle.

Further, the walk-behind self-propelled machine further includes: a work motor; the mowing blade is driven by the working motor to rotate so as to realize the mowing function of the backward-moving self-propelled machine; the chassis is formed with a cutting cavity that receives a mowing blade.

Further, the walk-behind self-propelled machine further includes: a work motor; the snow sweeping paddle is driven by the working motor to rotate so as to realize the snow sweeping function of the backward-moving self-propelled machine; and the snow throwing part guides the movement of the snow.

A walk-behind self-propelled machine comprising: a chassis; wheels for supporting the chassis and rotating relative to the chassis; the driving motor drives the wheels to rotate; a handle for the user to push the walk-behind self-propelled machine; the handle forms two holding parts for holding by the left hand and the right hand of a user respectively; a speed regulating member moving relative to the handle to regulate a rotational speed of the driving motor; the speed regulating part can be operated by a user when holding the holding part with one hand; the speed regulating part is arranged between the two holding parts; the electromechanical conversion device converts the position change of the speed regulating part relative to the handle into an electric signal; the circuit board assembly controls the rotating speed of the driving motor according to the electric signal of the electromechanical conversion device; the circuit board assembly is electrically connected with the driving motor and the electromechanical conversion device; the speed regulating member moves between a first position and a second position relative to the handle; when the speed regulating part is located at the first position, the circuit board assembly controls the rotating speed of the driving motor to be greater than that when the speed regulating part is located at the second position.

Further, the electromechanical conversion device is arranged in the handle; the electromechanical conversion device is located between the two holding portions.

Further, the speed member is rotatably connected to the handle about the central axis.

Further, the speed regulating member is constructed as an annular member; the speed regulating member surrounds the handle.

Further, the handle is symmetrical about a plane of symmetry perpendicular to the central axis; the grip portion comprises a first grip portion extending along the central axis; in the radial direction of the central axis, the maximum dimension of the speed regulating member is larger than the maximum dimension of the first grip portion.

Further, the electromechanical conversion device is a slide rheostat; the slide rheostat comprises a body and a slide block sliding relative to the body; the slide rheostat outputs different electric signals when the slide block is positioned at different positions relative to the body; the speed regulating part rotates relative to the handle to drive the sliding block to slide relative to the body.

Further, the electromechanical conversion device is arranged in the handle; the electromechanical conversion device corresponds to the position of the speed regulating part; the speed regulating part rotates around the central axis relative to the handle to drive the sliding block to slide along the direction parallel to the central axis relative to the body.

Further, the speed regulating member is formed with a chute inclined to the central axis; the handle is formed with a long hole extending in a direction parallel to the central axis; the chute is matched with the sliding block, and the chute drives the sliding block to slide relative to the body along a direction parallel to the central axis when moving relative to the sliding block; the elongated hole guides the slider to slide relative to the handle in a direction parallel to the central axis.

Further, the electromechanical conversion device is a hall sensor; the Hall sensor includes: a Hall element fixed to the handle; a magnetic member fixed to the speed adjusting member; the Hall sensor outputs different electric signals when the magnetic part is positioned at different positions relative to the Hall element.

Further, the walk-behind self-propelled machine further includes: a starting trigger for a user to operate and start the driving motor; when a user holds the holding part with one hand, the trigger and the speed regulating part can be operated; the grip portion includes: a first grip portion extending along a straight line; a second grip portion extending along a straight line; a connecting portion connecting the first grip portion and the second grip portion; the first holding part is arranged between the speed regulating part and the connecting part; the first holding part, the second holding part and the connecting part form an L shape; the starting trigger is arranged on the first holding part and the connecting part.

Further, the walk-behind self-propelled machine further includes: a starting trigger for a user to operate and start the driving motor; when a user holds the holding part with one hand, the trigger and the speed regulating part can be operated; the starting switch can be controlled by the starting trigger and used for starting the driving motor, and the starting switch is electrically connected with the driving motor; the starting switch is arranged in the handle.

Further, a walk-behind self-propelled machine, comprising: a work motor; the mowing blade is driven by the working motor to rotate so as to realize the mowing function of the backward-moving self-propelled machine; the chassis is formed with a cutting cavity that receives a mowing blade.

Further, a walk-behind self-propelled machine, comprising: a work motor; the snow sweeping paddle is driven by the working motor to rotate so as to realize the snow sweeping function of the backward-moving self-propelled machine; and the snow throwing part guides the movement of the snow.

According to the back-walking self-propelled machine disclosed by the invention, a user can start the driving motor to enable the back-walking self-propelled machine to be self-propelled forwards while holding the handle, when the user releases the holding of the handle and pulls the machine backwards, the driving motor can be turned off, and the back-walking self-propelled machine is pulled by the user to move backwards. The two modes are switched quickly and conveniently.

Drawings

FIG. 1 is a schematic illustration of a walk-behind self-propelled machine;

FIG. 2 is a schematic illustration of another perspective of the walk-behind self-propelled machine of FIG. 1;

FIG. 3 is an exploded view of a portion of the construction of the walk-behind self-propelled machine of FIG. 1;

FIG. 4 is a schematic illustration of a control assembly of the walk-behind self-propelled machine of FIG. 1;

FIG. 5 is a schematic diagram of the internal structure of the switch box of the control assembly of FIG. 4;

FIG. 6 is a schematic view of the internal structure of the handle of the control assembly of FIG. 4;

FIG. 7 is an exploded view of a portion of the structure of the control assembly of FIG. 4;

FIG. 8 is a schematic view of another perspective of the control assembly of FIG. 4;

FIG. 9 is a schematic view of the electromechanical transducer device and the speed member of the control assembly of FIG. 4;

FIG. 10 is an exploded view of the speed member of FIG. 9;

FIG. 11 is a schematic view from another perspective of the electromechanical conversion device and the speed adjusting member of FIG. 9;

FIG. 12 is a schematic view of an electromechanical conversion device, a speed adjustment member and a handle;

FIG. 13 is a schematic view of another electromechanical conversion device, a speed adjustment member and a handle;

FIG. 14 is a schematic view of another walk-behind self-propelled machine.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in fig. 1 and 2, walk-behind self-propelled machine 100 includes chassis 10, wheels 20, drive motor 30, and control assembly 40.

The chassis 10 serves as the primary support structure for the walk-behind self-propelled machine 100, assembling the various parts together.

The wheels 20 are used to support the chassis 10. The wheels 20 rotate relative to the chassis 10 to move the chassis 10 over the ground.

The driving motor 30 is used for driving the wheel 20 to rotate. The driving motor 30 is mounted to the chassis 10. Walk-behind self-propelled machine 100 also includes a transmission 31. The transmission mechanism 31 connects the driving motor 30 and the wheel 20.

The control assembly 40 is used to control the walk-behind self-propelled machine 100. The control assembly 40 includes a handle 41. The user can push the walk-behind self-propelled machine 100 to travel by pushing the handle 41. The handle 41 is connected to the chassis 10. Specifically, walk-behind self-propelled machine 100 also includes a linkage 50, linkage 50 connecting handle 41 and chassis 10. As an alternative embodiment, the handle 41 and the link 50 may be integrally formed. I.e. the handle 41 and the link 50 as one piece.

As shown in fig. 2 and 3, the walk-behind self-propelled machine 100 includes a work attachment 60 and a work motor 70. The work motor 70 drives the work attachment 60 to perform the function of the walk-behind self-propelled machine 100. The work motor 70 may be an electric motor powered by electric power or an internal combustion engine powered by fuel combustion. The chassis 10 carries a work motor 70. As a specific embodiment, the working motor 70 is an electric motor. Walk-behind self-propelled machine 100 also includes battery pack 80. The battery pack 80 supplies power to the working motor 70. The battery pack 80 supplies power to the driving motor 30. As another alternative, the working motor may not be provided, and the driving motor may drive the working attachment.

As a specific embodiment, the walk-behind self-propelled machine 100 shown in fig. 1 and 2 is a lawn mower. The mower includes a mowing blade. The mowing blade performs a mowing function as the working attachment 60. The chassis 10 is formed with a cutting cavity 11. The cutting chamber 11 houses a mowing blade. The mowing blade rotates within the cutting chamber 11.

As shown in fig. 4 to 8, the control assembly 40 includes a handle 41, a throttle 42, an electromechanical conversion device 43, start triggers 44a, 44b, start

switches

45a, 45b, a working trigger 46, a working switch 47, a security key 48, and a switch box 49.

The handle 41 is formed with a grip portion 411a for the left hand of the user and a grip portion 411b for the right hand. The grip portion 411a and the grip portion 411b are symmetrical with respect to a symmetry plane P1. The handle 41 is symmetrical with respect to a symmetry plane P1. The handle 41 is made of plastic. The handle 41 includes a first handle housing 412 and a second handle housing 413. The first handle housing 412 and the second handle housing 413 form a cavity.

The speed adjustment member 42 is operable by a user to adjust the rotational speed of the drive motor 30. The movement of the governor member 42 relative to the handle 41 adjusts the rotational speed of the drive motor 30. The speed regulating member 42 is provided in the middle of the handle 41. The speed member 42 is symmetrical about a plane of symmetry P1. The speed adjusting member 42 is disposed between the two

grips

411a, 411 b. The user can operate the speed adjusting member 42 with the left hand while holding the grip portion 411a with the left hand. Specifically, the user can operate the governor 42 with the thumb of the left hand while holding the grip 411a with the palm of the left hand. Also, the right hand can finish holding the grip 411b and operating the speed adjusting member 42 at the same time in the same manner as the left hand. The operation of the user is convenient. As a specific implementation, the speed adjusting member 42 is rotatably connected to the handle 41. The governor member 42 rotates about the center axis 101 with respect to the handle 41. The central axis 101 is perpendicular to the symmetry plane P1. The speed member 42 is constructed as an annular member. The speed regulating member 42 surrounds the handle 41. The speed regulating member 42 is provided with a plurality of grooves 423 arranged in the circumferential direction of the central axis 101. The groove 423 extends in the direction of the central axis 101. To facilitate rotation of the speed adjustment member 42 by the user. The speed regulating member 42 includes a first speed regulating housing 421 and a second speed regulating housing 422. The handle 41 is disposed between the first speed housing 421 and the second speed housing 422.

The electromechanical conversion device 43 converts the change in the position of the speed regulating member 42 relative to the grip 41 into an electric signal. The electromechanical conversion device 43 is provided in the handle 41. I.e. the electromechanical conversion device 43 is arranged in the cavity formed by the handle 41.

The actuation triggers 44a, 44b are used by a user to operate the actuation drive motor 30. The user can operate the start trigger 44a and the speed adjusting member 42 while holding the grip portion 411a with the left hand. Also, the user can operate the start trigger 44b and the throttle 42 while gripping the grip 411b with the right hand. Namely, the user can realize the control of two functions of starting and speed regulation by only one hand. And the control of the starting function and the speed regulation function can be realized no matter the holding part 411a or the holding part 411b is held.

The start switch 45a can be controlled by the start trigger 44a for starting the drive motor 30. The start switch 45a is electrically connected to the drive motor 30. The start switch 45b can be controlled by the start trigger 44b for starting the drive motor 30. The start switch 45b is electrically connected to the drive motor 30. As an alternative, it is also possible to provide only one start switch, both start triggers being used to activate the start switch and thus the drive motor. As an alternative, only one activation trigger may be provided. As a further alternative, the two actuating triggers can be formed as one part or can be moved synchronously. When the user operates the other start trigger to move, the other start trigger moves synchronously.

The work trigger 46 is used for user operation to activate the work motor 70. The working trigger 46 includes

movable portions

461a, 461b for operation by a user. The

movable portions

461a, 461b approach the handle 41 to activate the working motor 70. The working trigger 46 rotates relative to the handle 41 about a first axis 102. The first axis 102 is parallel to the central axis 101. The handle 41 rotates relative to the chassis 10 about the second axis 103 to perform the folding storage function of the handle 41. The second axis 103 is parallel to the central axis 101. The wheel 20 rotates relative to the chassis 10 about a third axis 104. The third axis 104 is parallel to the central axis 101. The link 50 includes a first link 51 and a second link 52. The first link 51 and the second link 52 constitute a sliding connection. The first link 51 slides relative to the second link 52 in the direction of the first line 105. The first line 105 is perpendicular to the central axis 101. The walk-behind self-propelled machine 100 includes a battery compartment 81 for mounting or housing a battery pack 80. The battery pack 80 is slidably connected to the battery compartment 81 in the direction of a second line 106. The second line 106 is perpendicular to the central axis 101. The axis of rotation of the working attachment 60 is parallel or perpendicular to the central axis 101.

The working switch 47 can be controlled by the working trigger 46 for starting the working motor 70. The work switch 47 is electrically connected to the work motor 70.

The security key 48 prevents the work trigger 46 from being touched by mistake and causing the work motor 70 to start. The user presses the security key 48 and then turns the work trigger 46 to activate the work switch 47 to start the work motor 70.

The switch case 49 is used to accommodate the operating switch 47. The working trigger 46 is rotatably connected to the switch box 49 about a first axis 102. The switch box 49 includes a switch box cover 491 and a switch box holder 492. The switch case 49 is fixed to the handle 41. The switch case 49 fixes the link 50. The switch case cover 491 and the switch case holder 492 sandwich the handle 41 and the link 50 from both sides.

Walk-behind self-propelled machine 100 also includes circuit board assembly 90. The circuit board assembly 90 controls the rotation speed of the drive motor 30 according to the electric signal of the electromechanical transducer 43. The circuit board assembly 90 electrically connects the driving motor 30 and the electromechanical transducer 43. As a specific embodiment, as shown in fig. 3, a circuit board assembly 90 is provided to the chassis 10. As other alternative embodiments, the circuit board assembly 90 may also be provided to the switch box 49 or the handle 41.

The speed member 42 is shown in a first position in fig. 4. The speed member 42 is shown in a second position in fig. 5. The governor member 42 is rotatable relative to the handle 41 from a first position to a second position. When the speed regulating member 42 is located at the first position, the circuit board assembly 90 controls the rotation speed of the driving motor 30 to be greater than the rotation speed of the driving motor 30 when the speed regulating member 42 is located at the second position. Specifically, the electromechanical conversion device 43 outputs different electric signals when the speed adjusting member 42 is in the first position and the second position. The circuit board assembly 90 controls the driving motor 30 to rotate at different speeds according to different electric signals of the electromechanical transducer 43.

The grip 411a includes a first grip 416a, a second grip 417a, and a connecting portion 418 a. The grip 411b includes a first grip 416b, a second grip 417b, and a connecting portion 418 b. The first grip portion 416a extends in a straight line. Specifically, the first grip portion 416a extends along the central axis 101. The first grip portion 416b extends along the central axis 101. The second grip portion 417a extends in a straight line. The second grip portion 417b extends in a straight line. The extending direction of the second grip portion 417a and the second grip portion 417b obliquely intersects the central axis 101. The first grip portion 416a and the first grip portion 416b are adjacent to the speed member 42. The speed adjustment member 42 is located between the first grip portion 416a and the first grip portion 416 b. The first grip portion 416a is disposed between the speed regulating member 42 and the connecting portion 418 a. The first grip portion 416b is disposed between the speed member 42 and the connecting portion 418 b. The first grip portion 416a, the second grip portion 417a, and the connecting portion 418a form an L-shape. The first grip portion 416b, the second grip portion 417b, and the connecting portion 418b form an L-shape.

In the radial direction of the central axis 101, the maximum dimension of the speed regulating member 42 is larger than the maximum dimension of the first grip portion 416a, and the maximum dimension of the speed regulating member 42 is larger than the maximum dimension of the first grip portion 416 b. The maximum dimension of the first grip portion 416a is the same as the maximum dimension of the first grip portion 416 b. The user can conveniently use the thumb to operate the speed regulating member 42 while holding the

first holding parts

416a and 416 b. In the radial direction of the central axis 101, the maximum dimension of the first grip portion 416a is the same as the maximum dimension of the first grip portion 416 b. The first grip portion 416a and the first grip portion 416b are symmetrical with respect to a symmetry plane P1.

The trigger 44a is provided to the grip 411 a. The trigger 44b is provided to the grip 411 b. The actuating triggers 44a, 44b are pivotally connected to the handle 41.

The activation trigger 44a includes an operation portion 441a protruding from the handle 41. The activation trigger 44b includes an operation portion 441b protruding from the handle 41. The operating portion 441a can be operated by a hand of a user holding the holding portion 411a while holding the holding portion 411a to start the drive motor 30. The operating portion 441b can be operated by a hand of a user holding the holding portion 411b while holding the holding portion 411b to start the drive motor 30. Specifically, the operating

portions

441a, 441b project rearward from the handle 41. The operating portion 441a can be operated to move forward by a hand of a user holding the holding portion 411a while holding the holding portion 411a to start the drive motor 30. The operating portion 441b can be operated to move forward by a hand of a user holding the holding portion 411b while holding the holding portion 411b to start the drive motor 30. The drive motor 30 drives the walk-behind self-propelled machine 100 forward when the activation triggers 44a, 44b are activated. When the user grips the

grips

411a, 411b, pushing the handle 41 forward can activate the drive motor 30. When the user needs to manually pull the walk-behind self-propelled machine 100 backward, the start triggers 44a, 44b need to be released to turn off the drive motor 30. The user may release the grip of the handle 41 and pull the handle 41 rearwardly, while the actuation triggers 44a, 44b are free from hand forces and can be released. It is avoided that when the start triggers 44a, 44b are arranged in front of the handle 41, the start triggers 44a, 44b are still subjected to force from the hand when the handle 41 is pulled backwards, causing the start triggers 44a, 44b to be in an open state, i.e. the drive motor 30 is not switched off, and it is difficult for the user to pull the machine backwards. Specifically, the maximum distance from any point on the actuation triggers 44a, 44b to the handle 41 is less than or equal to 20 mm. The user is facilitated to have the actuation triggers 44a, 44b released when the user pulls the handle 41 rearwardly with the grip of the

grips

411a, 411b relaxed.

The activation trigger 44a is disposed on the first grip portion 416a and the connecting portion 418 a. The activation trigger 44b is provided to the first grip portion 416b and the connecting portion 418 b. Specifically, one end of the operation portion 441a is provided to the first grip portion 416 a; the other end of the operating portion 441a is provided at the connecting portion 418 a. One end of the operating portion 441b is disposed on the first grip portion 416 b; the other end of the operating portion 441b is provided to the connecting portion 418 b. The user may control the activation trigger 44a with his or her palm while holding the first grip portion 416 a. The activation trigger 44a is activated while the user grips the first grip portion 416 a. The walk-behind self-propelled machine 100 is in a self-propelled state. The operation is convenient and fast. Similarly, the user may control the activation trigger 44b with his or her palm while holding the first grip portion 416 b. The activation triggers 44a, 44b are not located at the

second grip

417a, 417 b. The actuation triggers 44a, 44b are not triggered by the user gripping the

second grip

417a, 417b while the user is gripping the

second grip

417a, 417 b. The walk-behind self-propelled machine 100 is now in a non-self-propelled state. When the user does not need to use the self-propulsion function, the

second grips

417a, 417b may be gripped for operation. The user can use the thumb to control the activation triggers 44a, 44b while gripping the

second grip portions

417a, 417b to place the walk-behind self-propelled machine 100 into a self-propelled state.

The working trigger 46 includes

movable portions

461a, 461b for left and right hand operation by the user, respectively. The

movable portions

461a and 461b are provided in front of the handle 41. The user operates the

movable portions

461a, 461b to move backward to activate the working motor 70. The grip portion 411a, the movable portion 461a, and the operating portion 441a can be gripped by one hand of the user. Also, the grip portion 411b, the movable portion 461b, and the operating portion 441b can be gripped by one hand of the user. The

movable portions

461a, 461b extend in a straight line. The working trigger further comprises a middle part 462 connecting the two

movable parts

461a, 461 b. The middle portion 462 is offset from the straight line along which the

movable portions

461a, 461b extend. The handle 41 is formed with a receiving groove capable of receiving the

movable portions

461a, 461 b. When the working trigger 46 is triggered by the user, the

movable portions

461a and 461b are located in the receiving slots, so that the user can conveniently hold the holding

portions

411a and 411 b.

The activation trigger 44a is used to activate the activation switch 45 a. The start trigger 44b is used to trigger a start switch 45 b. The handle 41 is formed with passing

holes

414a, 414 b. The actuating trigger 44a projects from the handle 41 through the through hole 414 a. The actuating trigger 44b protrudes from the handle 41 through the through hole 414 b. Specifically, the first handle case 412 is formed with passing

holes

414a, 414 b. The two

activation triggers

44a, 44b are symmetrical about a plane of symmetry P1. The start switches 45a, 45b are provided in the handle 41. The two

actuation switches

45a, 45b are symmetrical with respect to a symmetry plane P1.

The electromechanical conversion device 43 is provided in the handle 41. The electromechanical conversion device 43 is located between the two

grips

411a, 411 b. The electromechanical conversion device 43 corresponds to the position of the speed regulating member 42. The position of the electromechanical conversion device 43 is beneficial to reasonably utilizing the space inside the handle 41, and the electromechanical conversion device 43 corresponds to the position of the speed regulating member 42, so that the structure is simplified.

As a specific embodiment, the electromechanical conversion device 43 is a sliding varistor. It is understood that potentiometers also belong to the sliding rheostat.

Specifically, the sliding varistor includes a body 431 and a slider 432 that slides with respect to the body 431. The slide rheostat outputs different electrical signals when the slide 432 is in different positions relative to the body 431. The movement of the governor member 42 moves the slider 432 relative to the body 431. More specifically, the rotation of the governor 42 relative to the handle 41 causes the slider 432 to slide relative to the body 431. The slider 432 slides relative to the body 431 in a direction parallel to the central axis 101.

As shown in fig. 7, 9 to 11, the governor 42 is formed with a chute 424 inclined to the central axis 101. The first speed housing 421 forms a chute 424. The angled slot 424 mates with the slider 432. Specifically, walk-behind self-propelled machine 100 also includes a connector 433, connector 433 being fixed to slide 432. The connector 433 passes through the elongated hole 415. The connecting member 433 extends into the inclined groove 424 of the speed adjusting member 42 to achieve the engagement of the inclined groove 424 with the sliding block 432.

When the governor member 42 is rotated relative to the handle 41, the inclined groove 424 moves relative to the slider 432. The chute 424 guides the slider 432 to slide relative to the body 431 in a direction parallel to the central axis 101. The handle 41 is formed with a long hole 415; specifically, the elongated hole 415 extends in a direction parallel to the central axis 101. The elongated hole 415 guides the slider 432 to slide relative to the handle 41 in a direction parallel to the central axis 101. The passing

holes

414a, 414b are located on the same side of the handle 41 as the elongated hole 415. The first handle housing 412 defines an elongated aperture 415 and passing

apertures

414a, 414 b.

Compared with the sliding block 432 sliding along the central axis 101 and rotating along the central axis 101, the sliding block 432 sliding along the central axis 101 does not need to have a longer opening along the direction perpendicular to the central axis 101, which is beneficial to increasing the strength of the handle 41. The speed regulating member 42 is rotatably connected to the handle 41. Compared with the structure that the speed regulating part is connected to the handle in a sliding mode, the speed regulating part 42 is connected with the handle 41 in a rotating mode, so that a user can operate any one of two hands conveniently, and the operation modes of the two hands are the same, and the use is convenient.

As another specific embodiment, the electromechanical transducing device is a sensor. The sensor detects the position of the speed regulating member 142 relative to the handle 141. Specifically, as shown in fig. 12, the electromechanical conversion device is a hall sensor 143. The hall sensor 143 detects the position of the governor member 142 relative to the handle 141. The hall sensor 143 includes a hall element 1431 and a magnetic member 1432. The magnetic member 1432 fixes the speed adjusting member 142. The hall element 1431 is fixed to the handle 141. When the speed regulating member 142 moves relative to the handle 141, the magnetic member 1432 moves relative to the hall element 1431. When the magnetic member 1432 is located at different positions relative to the hall element 1431, the hall sensor 143 outputs different electrical signals. The rotation of the speed regulating member 142 relative to the handle 141 causes the magnetic member 1432 to rotate relative to the hall element 1431.

As shown in fig. 13, the electromechanical transducing device is a hall sensor 243. The hall sensor 243 detects the position of the governor 242 with respect to the handle 241. The hall sensor includes a hall element 2431 and two magnetic pieces 2432. Two magnetic members 2432 are fixed to the speed adjusting member 242. As a specific embodiment, the two magnetic members 2432 have opposite magnetic directions. The hall element 2431 is fixed to the handle 241. Specifically, the hall element 2431 extends out of the handle 241 and is located between the two magnetic members 2432. When the speed adjustment member 242 moves relative to the handle 241, the magnetic member 2432 moves relative to the hall element 2431. When the magnetic member 2432 is located at different positions relative to the hall element 2431, the hall sensor 243 outputs different electrical signals. The rotation of the speed adjusting member 242 relative to the handle 241 rotates the magnetic member 2432 relative to the hall element 2431.

As an alternative embodiment, the electromechanical conversion device may be a touch screen, and a user's finger slides on the touch screen to output different electrical signals so as to control the rotation speed of the driving motor.

As another alternative, the electromechanical conversion device may be a slider. Specifically, the finger of the user slides on the sliding strip from back to front once to increase the rotating speed of the driving motor by one gear, so that the rotating speed of the driving motor is increased; the finger of the user slides on the sliding strip from front to back once to reduce the rotating speed of the driving motor by one gear, and the rotating speed of the driving motor is reduced.

As a specific embodiment, the walk-behind self-propelled machine 200 is a snow blower, as shown in fig. 14. The snowplow includes a work motor 210, a snow plow paddle 220, a snow thrower 230, and a chassis 240. The snow-removing paddle 220 serves as a working attachment to perform the snow-removing function. The snow thrower 230 serves to guide the movement of the snow. The working motor 210 drives the snowplow to rotate and drive the snow to be thrown out of the snow thrower 230. The base plate 240 is formed with a channel 250. The snow-removing paddle 220 rotates within the channel 250. The snow sweeper shown in fig. 14 can be used in the same manner of controlling self-propulsion and the same structure for achieving self-propulsion as compared to the mower shown in fig. 1. Specifically, the control assembly 260 of the snowplow shown in fig. 14 is identical to the control assembly 40 of the mower shown in fig. 1.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A walk-behind self-propelled machine comprising:

a chassis;

wheels for supporting the chassis and rotating relative to the chassis;

a work motor for driving a work attachment;

the driving motor drives the wheels to rotate;

a handle for a user to push the walk-behind self-propelled machine, the handle forming two gripping portions for the user to grip with the left and right hands, respectively;

the working trigger comprises two movable parts which are respectively operated by the left hand and the right hand of a user, and the movable parts are arranged on the front side of the handle and are used for the user to operate and start the working motor;

a starting trigger for a user to operate and start the driving motor; the starting triggers are respectively arranged on the holding parts;

the activation trigger includes an operating portion projecting at least partially rearwardly of the handle,

the holding part, the movable part and the operation part which are positioned on the same side can be held by a single hand of a user.

2. The walk-behind self-propelled machine of claim 1, wherein:

the walk-behind self-propelled machine further comprises:

the starting switch can be controlled by the starting trigger and is used for starting the driving motor, and the starting switch is electrically connected with the driving motor;

the starting switch is arranged in the handle.

3. The walk-behind self-propelled machine of claim 1, wherein:

the walk-behind self-propelled machine comprises two of the start-up triggers;

the handle forms two of the holding parts;

the two holding parts are symmetrical about a symmetrical plane;

both of the activation triggers are symmetrical about the plane of symmetry.

4. The walk-behind self-propelled machine of claim 1, wherein:

the grip portion includes:

a first grip portion extending along a straight line;

a second grip portion extending along a straight line;

a connecting portion connecting the first grip portion and the second grip portion;

the first holding part, the second holding part and the connecting part form an L shape; the starting trigger is arranged on the first holding part and the connecting part.

5. The walk-behind self-propelled machine of claim 1, wherein:

the activation trigger is rotatably coupled to the handle.

6. The walk-behind self-propelled machine of claim 1, wherein:

the maximum distance from any point on the activation trigger to the handle is less than or equal to 20 mm.

7. The walk-behind self-propelled machine of claim 1, wherein:

the handle forms two of the holding parts;

the two holding parts are symmetrical about a symmetrical plane;

the walk-behind self-propelled machine further comprises:

a speed adjusting member moving relative to the handle to adjust a rotational speed of the driving motor; the speed regulating piece can be operated by a user when the holding part is held by one hand; the speed regulating part is arranged between the two holding parts;

the speed regulating member is rotatably connected to the handle.

8. The walk-behind self-propelled machine of claim 1, wherein:

the working accessory is a mowing blade and is driven by the working motor to rotate so as to realize the mowing function of the walk-behind self-propelled machine; the chassis is formed with a cutting cavity that receives a mowing blade.

9. The walk-behind self-propelled machine of claim 1, wherein:

the working accessory is a snow-sweeping paddle, and the working accessory is driven by the working motor to rotate so as to realize the snow sweeping function of the backward-moving self-propelled machine;

and the snow throwing part guides the movement of the snow.