CN212936732U

CN212936732U - Grass cutter

Info

Publication number: CN212936732U
Application number: CN202020225458.8U
Authority: CN
Inventors: 马妙武; 熊建
Original assignee: Shanghai Congyuan Machinery Co ltd
Current assignee: Shanghai Shanke robot Co.,Ltd.
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2021-04-13
Anticipated expiration: 2030-02-28

Abstract

The application discloses a mower. The mower comprises a cover body and a chassis positioned below the cover body, wherein the cover body is movably connected to the chassis through a connecting device. The connecting device includes: the base is detachably and fixedly connected to the chassis; a linkage movably coupled at a first end to the cover; and the first end of the elastic piece is connected to the second end of the connecting rod, and the second end of the elastic piece is connected to the base. The application is convenient to assemble, and tools can be omitted.

Description

Grass cutter

Technical Field

The utility model relates to a garden equipment, concretely relates to lawn mower.

Background

The existing lawn mowers are more and more intelligent, most of intelligent lawn mowers transmit related signals to a controller when touching obstacles or being manually lifted, and the controller makes corresponding feedback, so that the lawn mowers correspondingly act, such as stop working.

Mowers typically have a chassis and a cover that is movably attached to the chassis. When the intelligent mower touches an obstacle or is lifted manually, the cover body part moves relative to the chassis part, and then a corresponding sensor or a microswitch is triggered to act, so that the mower acts related to actions, such as retreating or stopping working.

Currently, the cover is typically movably attached to the cover by attachment assemblies, which are typically comprised of multiple components and typically require screws to fixedly attach the cover to the chassis, which are relatively complex, time consuming and require tools to install. In addition, existing linkage assemblies are often complex in construction, resulting in high cost, or are not reliable enough to operate.

Therefore, there is a need for further improvements to existing lawn mowers to address the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lawn mower, it has the structure simple relatively, need not the connecting device that is used for connecting lid and chassis of instrument installation.

In order to achieve the above object, the present invention provides a lawn mower, the lawn mower includes a cover and a chassis located below the cover, wherein the cover is movably connected to the chassis through a connecting device, the connecting device includes:

the base is detachably and fixedly connected to the chassis;

a linkage movably coupled at a first end to the cover; and

the first end of the elastic piece is connected to the second end of the connecting rod, and the second end of the elastic piece is connected to the base.

In one embodiment, the base is removably secured to the chassis without tools.

In one embodiment, the base is fixedly connected to the chassis through a snap structure.

In an embodiment, the connecting device further includes a connecting sleeve, the connecting sleeve is connected to the cover, and the first end of the connecting rod is movably connected to the connecting sleeve.

In one embodiment, one of the outer wall of the connecting sleeve and the cover body is provided with a groove, and the other one is provided with a protrusion matched with the groove, and the connecting sleeve and the cover body are mutually connected through the matching of the groove and the protrusion.

In one embodiment, the cover body is provided with a mounting hole, the mounting hole is composed of two mutually communicated and intersected round holes with different diameters, and the connecting sleeve is arranged in the round hole with the smaller diameter.

In one embodiment, a hollow space is arranged inside the connecting sleeve, the hollow space is respectively an accommodating part, a necking part and an opening part which are communicated with each other from top to bottom, and the diameter of the necking part is reduced relative to the diameter of the accommodating part and the diameter of the opening part.

In one embodiment, the head of the connecting rod is spherical, and the accommodating portion is spherical matched with the head of the connecting rod.

In one embodiment, the base is provided with a hook, the chassis is provided with a clamping groove, and the base is fixed on the chassis through the matching of the hook and the clamping groove.

In one embodiment, the base has a plate-shaped body, two opposite sides of the plate-shaped body extend with an elastic arm respectively, and the end of the elastic arm is provided with a hook.

In one embodiment, a reinforcing rib is disposed between the elastic arm and the plate-shaped main body.

In one embodiment, the base has a plate-shaped body, the chassis is provided with an accommodating cavity, the accommodating cavity has an open end, and the plate-shaped body covers the open end.

In one embodiment, the link is further movably mounted to the chassis, the base is located below the link, and the resilient member is mounted between the link and the base.

In one embodiment, the outer edge of the chassis is provided with a mounting wall having a through hole therethrough, and the link has a head portion, a stem portion and a shoulder portion in sequence from top to bottom, wherein the head portion is movably coupled to the cover, the stem portion passes through the through hole, the shoulder portion is located below the mounting wall, and a first end of the elastic member is connected to an end portion of the link located below the shoulder portion, and a second end of the elastic member is connected to the base.

In one embodiment, a neck is arranged between the head portion and the rod portion of the connecting rod, the head portion is spherical, the rod portion is columnar, and the diameter of the neck is smaller than that of the head portion.

In one embodiment, the upper surface of the shoulder is spherical, and the lower surface of the mounting wall is spherical.

In one embodiment, a mounting post extends from a lower surface of the shoulder, and a protruding post extends from an upper surface of the base, wherein a first end of the elastic member is mounted to the mounting post, and a second end of the elastic member is mounted to the protruding post.

In one embodiment, the link is further movably mounted to the chassis, the base is provided with a through hole, the first end of the elastic member passes through the through hole and is connected to the second end of the link, and the second end of the elastic member is connected to the lower end of the base.

In one embodiment, the connecting rod has a head portion, a rod portion and a spiral portion from top to bottom, wherein the head portion is movably connected to the cover body, the rod portion is rod-shaped, the spiral portion is provided with a spiral groove, and a first end of the elastic member is matched with the spiral groove to connect the elastic member to the connecting rod.

In one embodiment, the tip of the spiral part is provided with a projection projecting radially from the outer wall of the spiral part, and the inside of the spiral part is hollow and provided with a recess penetrating the outer wall of the spiral part.

In one embodiment, the base has a plate-shaped body, the lower surface of the plate-shaped body extends downward to form an elastic arm at two opposite sides, the end of the elastic arm is provided with a hook, the chassis is provided with a slot, the hook is in snap fit with the slot, the middle of the plate-shaped body is provided with a through hole, the first end of the elastic member passes through the through hole and is connected to the second end of the connecting rod, and the second end of the elastic member is connected to the lower end of the base.

In one embodiment, a convex column is further integrally extended from the lower surface of the plate-shaped main body, and the bottom surface of the convex column is pressed against the bottom of the elastic piece.

In one embodiment, the elastic member is a spring, the spring has a main body portion and a bottom portion located below the main body portion, the main body portion penetrates through the through hole and is fixedly connected to the second end of the connecting rod, and the bottom portion is located below the through hole and abuts against the base.

In one embodiment, the spring is integrally formed from the body portion and the base portion.

In one embodiment, the outer diameter of the main body of the spring is smaller than the inner diameter of the through hole of the base, and the inner diameter of the through hole of the base is smaller than the outer diameter of the bottom of the spring.

In one embodiment, the body portion is configured as a straight helical cylindrical spring and the base portion is configured as a truncated conical spring, a flat spiral spring or a helical cylindrical spring.

In one embodiment, the connecting device further comprises a rubber sleeve, the connecting rod is further provided with a groove part between the rod part and the spiral part, the groove part is provided with an annular groove, the base is provided with a plate-shaped main body and a boss protruding upwards from the plate-shaped main body, the outer side wall of the boss is provided with a groove, the bottom end of the rubber sleeve is connected to the groove of the boss, and the top end of the rubber sleeve is connected to the annular groove of the connecting rod.

In one embodiment, the connecting device further includes a rubber sleeve, a top end of the rubber sleeve is fixedly connected to the connecting rod, a bottom end of the rubber sleeve is fixedly connected to an upper end of the base, and the rubber sleeve at least surrounds a portion of the elastic member extending above the base.

In one embodiment, the rubber sleeve is in a bellows shape.

In one embodiment, the elastic member is a spring.

The application also provides an assembling method of the mower, the mower comprises a cover body and a chassis positioned below the cover body, wherein the cover body is movably connected to the chassis through a connecting device, and the assembling method is characterized by comprising the following steps of:

s1, preparing the connecting device, wherein the connecting device comprises a base, a connecting rod and an elastic piece;

s2, assembling the base, the connecting rod and the elastic piece together, wherein the base can be mounted to the chassis without tools;

and S3, connecting the connecting rod and the cover body to each other without tools.

In an embodiment, the connecting device further includes a connecting sleeve, and the assembling method further includes mounting the connecting sleeve to the cover.

In an embodiment, the connecting device further includes a connecting sleeve, the assembling method further includes mounting the connecting sleeve on the cover, and in step S2, the base, the elastic member and the connecting rod are assembled together in sequence from bottom to top, and then the base is snapped to the chassis; and in step S3, the cover is placed over the chassis and pressed downward, and the connection sleeve is sleeved on the connecting rod.

In one embodiment, the connecting device further comprises a rubber sleeve, and the elastic member is a spring, wherein, in step S2, the spring is first installed to the base, then the base is snapped to the chassis, then the rubber sleeve is sleeved outside the spring and the bottom end of the rubber sleeve is installed to the base, then the connecting rod is inserted into the first end of the spring and screwed, and finally the upper end of the rubber sleeve is connected to the connecting rod; and in step S3, the cover is placed over the chassis and pressed downward, and the connection sleeve is sleeved on the connecting rod.

The lawn mower of the application is convenient to assemble, and the cover body can be movably mounted on the chassis without tools.

Drawings

Fig. 1 is a perspective view of a lawn mower according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of a lawn mower according to an embodiment of the present invention.

Fig. 3 is an exploded perspective view of a connecting device between a cover and a base plate of a lawn mower according to an embodiment of the present invention.

Fig. 4 is a bottom view of a lawn mower according to an embodiment of the present invention.

Fig. 5 is a sectional view taken along the section line a-a in fig. 4.

Fig. 6 is an enlarged view of a portion B in fig. 5.

Fig. 7 is an exploded perspective view of a portion of the cover of the lawn mower of fig. 1, showing a connection structure between the connection sleeve and the cover.

Fig. 8 is a top view of a connecting sleeve according to an embodiment of the present invention.

Fig. 9 is a sectional view taken along section line C-C in fig. 8.

Fig. 10 is a top view of a chassis according to an embodiment of the present invention.

Fig. 11 is a partially cut-away perspective view of the cross-section taken along section line D-D in fig. 10.

Fig. 11A is an enlarged view of a portion G in fig. 11.

Fig. 12 is a perspective view of a lawn mower according to another embodiment of the present invention.

Fig. 13 is a top view of a chassis of the mower of fig. 12.

Fig. 14 is an exploded perspective view of a connecting device between a cover and a base plate of a lawnmower according to another embodiment of the present invention.

Fig. 15 is a perspective view of the spring of fig. 14.

Fig. 16 is a bottom view of the mower of fig. 12.

Fig. 17 is a sectional view taken along section line E-E in fig. 16.

Fig. 18 is an enlarged view of portion F in fig. 17.

Detailed Description

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

As shown in fig. 1-2, mower 100 includes a cover 10 and a chassis 20 movably attached to cover 10. The chassis 20 is provided with a driving wheel 201 and a driven wheel 202. The drive wheel 201 and the driven wheel 202 are typically located at the front and rear ends of the mower, respectively. The driving wheel 201 is used for driving the mower 100 to walk and is connected with a driving motor or internally provided with a driving motor. The bottom of the chassis 20 mounts a cutting assembly 203 (see fig. 4) for mowing grass. The chassis also houses a control device (not shown) for controlling the operation of the mower and a battery pack (not shown) for providing power to the mower. The structures of the driving wheel 201, the driven wheel 202, the cutting assembly, the control device and the battery assembly can adopt the known prior art or the developed technology, and the structures are not described in detail herein.

The cover 10 is movably connected to the chassis 20 by means of a connecting device 30, so that the cover can be moved, e.g. displaced, relative to the chassis. The chassis 20 is provided with movement detection means which are particularly adapted to detect displacement of the cover so that when the cover 10 is moved, e.g. displaced, relative to the chassis 20, the movement is detected and a related signal is transmitted to the control means, so that when the mower is, for example, bumped or lifted manually, the control means can react accordingly to control the mower, e.g. to stop working or to move backwards. In one embodiment, the movement detection device comprises a permanent magnet (not shown) and a magnetic induction element (typically a hall element, not shown) respectively disposed at corresponding positions of the cover 10 and the chassis 20, when the cover leaves the initial position in case of a collision, the magnetic induction element disposed on the chassis senses a change in position of the permanent magnet disposed on the cover, i.e., outputs a signal indicative of the collision event to the control device, thereby controlling the action of the lawn mower. The above-described motion detection means and control means are well known in the art and may be implemented using known technologies or technologies yet to be developed, and will not be described in detail herein.

As shown in fig. 3 to 6, in the present embodiment, the connecting device 30 has a connecting sleeve 301, a connecting rod 302, a spring 303, and a base 304. The connection sleeve 301 is detachably connected to the cover 10. A first end of link 302 is movably connected to connection sleeve 301. In the embodiment shown, the first end of the link 302 is the upper end of the link 302. Link 302 is also movably mounted to chassis 20. Base 304 is fixedly attached to chassis 20 and is positioned below linkage 302. Spring 303 is mounted between link 302 and base 304. The spring 303 is used to urge the cover 10 back relative to the chassis 20 after a crash. Through the connecting device 30, when the cover 10 is bumped or lifted by a person, the cover 10 can be displaced and/or rotated in the horizontal direction and/or the vertical direction relative to the chassis 20. Specifically, the link 302 can rotate relative to the connection sleeve 301, and thus relative to the cover 10. Link 302 may also rotate relative to chassis 20. Thereby, the cover 10 can rotate with respect to the chassis 20. Further, the link 302 can also move up and down in the vertical direction with respect to the chassis 20, so that the cover 10 can move up and down in the vertical direction with respect to the chassis 20.

Specifically, referring to fig. 6-9, connecting sleeve 301 is generally cylindrical. The outer peripheral wall of the connecting sleeve 301 is provided with an annular groove 3011. The inside of adapter sleeve 301 is equipped with hollow space. The hollow space is a housing portion 3012 and an opening portion 3013 which is open downward from top to bottom. The housing portion 3012 and the opening portion 3013 communicate with each other, and a constricted portion 3014 is provided therebetween. The housing section 3012 is a substantially spherical hollow space. The opening 3013 is a hollow space having a conical shape. The constricted portion 3014 has a size (diameter) narrowed to the housing portion 3012 and narrowed to the opening portion 3013. Thus, the head of the link 302 can pass through the opening 3013 and the neck 3014 in sequence and be rotatably accommodated in the accommodating portion 3012, so that the link 302 can be rotatably connected to the connecting sleeve 301. The conical space of the opening 3013 allows the link to swing in the space. The top end of the connecting sleeve can also be provided with a vent hole 3015.

As shown in fig. 7, the cover 10 is provided with a mounting hole 101. The mounting hole 101 is composed of two circular holes of different diameters communicating with each other and intersecting with each other. The diameter of the large round hole 1011 with a larger diameter is slightly larger than the outer diameter of the non-groove part of the connecting sleeve 301, and the diameter of the small round hole 1012 with a smaller diameter is smaller than the outer diameter of the non-groove part of the connecting sleeve and slightly larger than the outer diameter of the groove part. Thus, during assembly, the connection sleeve 301 enters the large circular hole 1011 in the axial direction, and then the connection sleeve 301 moves toward the small circular hole 1012 in the radial direction, so that the annular groove 3011 on the connection sleeve snaps into the protrusion 102 on the cover 10, thereby completing the installation of the connection sleeve 301. Preferably, the connection sleeve 301 is made of an elastic material such as a rubber material. It should be understood that the connecting sleeve 301 may also be made of other materials with certain elasticity, such as plastic materials.

In other embodiments, a groove may be formed on the cover, and an annular protrusion may be formed on an outer wall of the connection sleeve, so that the connection sleeve is mounted on the cover by the engagement of the annular protrusion and the groove. The connecting sleeve 301 can also be mounted on the cover body by other means, for example, the connecting sleeve is provided with a snap structure and is mounted on the cover body 10 by means of a snap. In another embodiment, instead of providing a separate adapter sleeve, a structure similar to the receiving portion, the opening portion, and the constricted portion of adapter sleeve 301 may be integrally formed on the cover.

As shown in fig. 2 and 6, the link 302 has a head portion 3021, a shaft portion 3022, and a shoulder portion 3023 in this order from top to bottom. The head portion 3021 is provided at the tip end of the link 302 and has a spherical shape. The stem 3022 is rod-shaped and preferably circular in cross-section. The head 3021 has a diameter greater than the diameter of the stem 3022. A neck 3024 is provided between the head 3021 and the stem 3022. The neck 3024 is narrowed relative to the stem, i.e., the diameter of the neck 3024 is smaller than the diameter of the stem. The shoulder 3023 extends radially outward relative to the outer side wall of the stem portion 3022 and is formed in a generally circular ring shape. Preferably, the upper surface of the shoulder 3023 is configured as at least a portion of a sphere. The lower surface of shoulder 3023 is recessed to facilitate receiving spring 303. The lower surface of shoulder 3023 extends beyond spring attachment portion 3025, which is used to mount a first end of spring 303. In the embodiment shown in the figures, the first end of the spring 303 is the upper end of the spring 303 and the second end of the spring 303 is the lower end of the spring 303. In this embodiment, the spring connecting portion 3025 is located at the lower end of the link below the shoulder, i.e., at the second end of the link, specifically one mounting post 3025 integrally extending from the lower surface of the shoulder 3023. It should be understood that the spring connecting portion 3025 may have other structures as long as it can be connected to one end of the spring 303. The spring 303 may be replaced by another elastic member as long as it can urge the cover 10 to be reset with respect to the chassis 20 after the collision.

As shown in fig. 2, 6, and 11A, the chassis 20 is provided with a plurality of chassis connection portions 204. The chassis connection 204 is located at the outer edge of the chassis. Each chassis connection portion 204 has a mounting wall 2041 integrally formed to the chassis 20. The mounting wall 2041 has a through hole 2042 in the middle through which the link 302 passes. The lower surface of the mounting wall 2041 is configured to be at least a portion of a spherical surface that mates with the upper surface of the shoulder 3023 of the linkage 302 so that upon displacement of the cover, the upper surface of the shoulder is relatively movable against the lower surface of the mounting wall 2041. A receiving cavity 2043 is provided below the mounting wall 2041 for receiving the spring 303. On either side of the receiving cavity 2043 are locking slots 2044 configured to engage with hooks on the base 304 to secure the base 304 to the chassis 20 and to position the spring 303 within the receiving cavity 2043.

Referring to fig. 3 and 6, the base 304 has a plate-shaped body 3041. The plate-like body 3041 is shaped to match the shape of the open end of the housing cavity 2043 to cover the open end of the housing cavity when assembled. In this embodiment, the open end is the lower end of the accommodating cavity. A spring mounting portion 3042, which is a convex pillar integrally protruding upward from the plate-shaped body 3041, is provided in the middle of the upper surface of the plate-shaped body 3041. An elastic arm 3043 extends upward from the upper surface of the plate-shaped body 3041 at two opposite sides, and a hook 3044 is disposed at the end of the elastic arm 3043. The hook 3044 and the slot 2044 form a fastening structure together to fasten the base to the chassis. A reinforcing rib 3045 is connected between the elastic arm 3043 and the plate-like body 3041.

As shown in fig. 6, the upper end of the spring 303 is connected to the spring connecting portion 3025 of the link 302, and the lower end is attached to the spring attaching portion 3042 of the base. In this embodiment, the cover 10 and the chassis 20 are connected to each other by 4 connecting devices 30. It should be understood that other numbers of attachment devices 30 may be used to attach the cover 10 and the chassis 20 to each other as desired, such as 3, 5, or more.

The steps of assembling the cover 10 and the base plate 20 using the above-mentioned connecting device 30 are as follows:

s1, mounting a connecting sleeve on a cover body, and sequentially assembling a base, a spring and a connecting rod together from bottom to top, wherein two ends of the spring are respectively connected to the base and the connecting rod;

s2, inserting the head of each connecting rod into the connecting part of the chassis from the lower direction and penetrating through the through hole of the mounting wall until the shoulder of each connecting rod abuts against the lower surface of the mounting wall of the connecting part of the chassis, and clamping the clamping hook of the base with the clamping groove of the chassis;

s3, the cover body is arranged above the chassis, the connecting sleeve is aligned with the head of the connecting rod and pressed downwards, and the head enters the accommodating part, so that the assembly is completed.

In the installation process, the connection among the base, the connecting rod and the spring does not have a fastener such as a screw which can be assembled and disassembled only by using a special tool, the assembly and the disassembly are convenient, and the tool is not needed in the assembly and the disassembly. Here, tool-free assembly and disassembly means that assembly and disassembly can be performed by only bare hands without the aid of external tools. In addition, the structure of the connecting device is relatively simple, so that the operation is more reliable and the cost is lower.

After the assembly is completed, the head of the connecting rod can rotate relative to the connecting sleeve, the shoulder of the connecting rod can rotate relative to the chassis, and the connecting rod can move up and down along the through hole of the mounting wall. Therefore, the cover body of the mower can be allowed to move relative to the chassis, such as translating and/or rotating, when the cover body of the mower encounters an abnormal condition, such as collision with foreign matters or being lifted by people, in the working process of the mower, so that the control device is triggered to perform corresponding actions, and the mower is controlled to stop working or retreat. Further, when the mower is released from the abnormal condition, the mower can be restored to the normal working state through the reset action of the spring.

Fig. 12-18 illustrate a lawnmower 200 according to another embodiment of the present invention. The main differences between this embodiment and the embodiment shown in fig. 1-11A are the structure of the attachment means and the corresponding structure of the cover and chassis. Therefore, for clarity, the connecting device 40 and related structure of the present embodiment are mainly described herein, and other structures are not described again.

As shown in fig. 14 and 18, the connecting device 40 has a connecting sleeve 401, a link 402, a spring 403, a base 404, and a rubber sleeve 405. The connection sleeve 401 is detachably connected to the cover 10. A first end of the link 402 is movably connected to the connection sleeve 401. The link 402 is also movably mounted to the chassis 60 by a spring 403. The base 404 is fixedly attached to the chassis 60 and is provided with a through hole 4044. A first end of spring 403 passes from bottom to top through hole 4044 and connects to a second end of link 402. In the embodiment shown, the first end of link 402 is the upper end of link 402 and the second end of link 402 is the lower end of link 402. The second end of the spring abuts the lower end of the base 404. In the embodiment shown in the figures, the first end of spring 403 is the upper end of spring 403, and the second end of spring 403 is the lower end of spring 403. The spring 403 serves to urge the cover 50 back relative to the chassis 60 after impact. The rubber sleeve 405 is connected at its lower end to the upper end of the base 404 and at its upper end to the connecting rod 402. The rubber boot surrounds at least the portion of the spring 403 that extends above the base 404. The rubber sleeve 405 mainly plays a role of dust prevention. It should be understood that the rubber sleeve may be eliminated.

Through the connecting device 40, when the cover 50 is bumped or lifted by a person, the cover 50 can be translated and/or rotated in a horizontal direction and/or a vertical direction relative to the chassis 60. Specifically, the link 402 can rotate relative to the connection sleeve 401, and thus relative to the cover 50. The link 402 may also rotate relative to the chassis 60. Thus, the cover 50 may translate and/or rotate relative to the chassis 60. Further, the linkage 402 may also translate in a vertical direction relative to the chassis 60 such that the cover 50 may translate in a vertical direction relative to the chassis 60.

Specifically, the structures of the connection sleeve 401 and the corresponding mounting hole 501 on the cover 50 are the same as the structures and mounting manners of the connection sleeve 301 and the mounting hole 101 of the embodiment shown in fig. 1-11, respectively, and will not be described in detail herein. Also, in the present embodiment, the connection sleeve 401 is preferably made of rubber. The connection sleeve 401 may also adopt different structures, for example, the connection sleeve is provided with a snap structure and is mounted on the cover 50 by a snap-fit manner. In another embodiment, instead of providing a separate adapter sleeve, a structure similar to the receiving portion, the opening portion, and the constricted portion of the adapter sleeve 401 may be integrally formed on the cover.

As shown in fig. 14 and 18, the connecting rod 402 has a head portion 4021, a rod portion 4022, a groove portion 4023, and a spiral portion 4024 in this order from top to bottom. Head 4021 is disposed at the top end of connecting rod 402 and is spherical. The rod portion 4022 is rod-shaped, and reinforcing ribs 4025 are provided on an outer wall thereof. Slot 4023 is located at the lower end of shaft 4022 and has an annular groove 4026. The spiral portion 4024 is located below the groove portion 4023 and has a cylindrical shape. The spiral 4024 is used to mount the spring 403. The outer wall of the spiral portion 4024 is provided with a spiral groove 4027. The tip of the spiral portion 4024 is provided with a projection 4028 projecting radially from the outer wall of the spiral portion. The protrusions 4028 are designed to abut the end faces of the springs as they are wound, ensuring that the wound strength of each spring (different springs on the same machine, springs on different machines) is consistent. The interior of the spiral portion 4024 is hollow and is provided with a recess 4029 that penetrates the outer wall of the spiral portion. Recess 4029 is configured to reduce the outer diameter of connecting rod 402 when subjected to a force. Specifically, when unstressed, the outer diameter of link 402 is slightly larger than the inner diameter of the spring, and when connected, the stressed outer diameter of the link is reduced and the spring can be sleeved on the outside of the link and wound. Due to the elasticity of the connecting rod, the spring can be clamped to prevent loosening.

As shown in fig. 13 and 18, the chassis 60 is provided with a plurality of chassis connection portions 601. The chassis connection 601 is located at an outer edge of the chassis. Each chassis interface 601 has an open receiving cavity 6021 that is a recessed cavity integrally formed in the chassis 60. The middle of the housing cavity 6021 has a post 6022. The lower end of the spring 403 is sleeved on the convex column 6022 and is in interference fit with the convex column 6022. The receiving cavity 6021 is provided with snap slots 6023 on opposite sides thereof that are configured to engage with snap hooks on the base 404 to secure the base 404 to the chassis 60 and to position the lower end of the spring 403 within the receiving cavity 6021, as will be described further below.

With continued reference to figures 14 and 18, the base 404 has a plate-like body 4041. The plate-like body 4041 is shaped to match the shape of the open end of the receiving cavity 6021 to cover the open end of the receiving cavity after assembly. In this embodiment, the open end is the upper end of the accommodating cavity. The plate-like body 4041 is provided at a middle portion of an upper surface thereof with a groove portion 4042 which is a boss protruding upward integrally from the plate-like body 4041. The outer side wall of the boss is provided with a groove 4043 for mounting the rubber sleeve 405. A convex column 4045 is also integrally extended from the middle part of the lower surface of the plate-shaped main body. When assembled, the bottom surface of post 4045 presses against the bottom of spring 403. The plate-shaped body 4041 is provided at a central portion thereof with a through hole 4044 through which the spring 403 passes. The through hole 4044 penetrates the boss and the protruding column 4045. The lower surface of the plate-shaped main body 4041 is extended with a resilient arm 4046 at two opposite sides, and a hook 4047 is arranged at the end of the resilient arm 4046. The hook 4047 and the groove 6023 of the chassis form a snap structure together to fasten the base on the chassis.

As shown in fig. 14, the spring 403 is of unitary construction, including a body portion 4031 and a base portion 4032 below the body portion. Body 4031 is configured as a coiled cylindrical spring having an inner diameter that is adapted to the helical groove of the helical portion of connecting rod 402. The base 4032 is configured as a truncated cone or flat spiral spring, or a helical cylindrical spring. The outer diameter of the body 4031 of the spring 403 is smaller than the inner diameter of the through hole 4044 of the base 404, and the inner diameter of the through hole of the base 404 is smaller than the outer diameter of the bottom of the spring 403. Thus, the upper end of spring 403 may pass through-hole 4044 of base 404 to connect with the coil of linkage 402, while the lower end of spring 403 is located below through-hole 4044 and its bottom abuts against post 4045 of base 404. In other embodiments, the spring may be made of other resilient materials (e.g., rubber), with the upper end of the spring body being internally threaded and the fixed portion of the linkage being externally threaded for mating therewith. In other embodiments, the body portion and the base portion of the spring 403 may be formed separately and then joined together, such as by welding. At this time, the bottom of the spring 403 may be, for example, a disk or a ring. The spring 403 may be replaced by another elastic member as long as it can urge the cover to return with respect to the chassis after the collision.

With continued reference to fig. 14, the rubber sleeve 405 has a bellows shape with a bottom end having a diameter larger than that of the remaining portion. The rubber sleeve 405 is sleeved outside the spring 403. Rubber boot 405 has its bottom end attached to groove 4043 of boss of base 404 and its top end attached to groove 4026 of slot 4023 of link 402. Thus, the rubber sleeve 405 may function to seal and protect the spring. In other embodiments, the rubber sleeve may be eliminated.

In this embodiment, the cover 50 and the chassis 60 are connected to each other by 4 connecting devices 40. It should be understood that other numbers of attachment devices 40 may be used to interconnect the cover 50 and the chassis 60 as desired, such as 3, 5, or more.

The steps of assembling the cover 50 and the chassis 60 using the above-described connecting device 40 are as follows:

s1, mounting a connecting sleeve on a cover body, and enabling a main body part of a spring to penetrate through a through hole of a base from the lower side of the base, so that the bottom of the spring is abutted to the bottom surface of a convex column of the base;

s2, downwards buckling the base to a clamping groove of the base plate, and sleeving the rubber sleeve on the main body part of the spring to enable the lower end of the rubber sleeve to be connected to a boss at the upper end of the base;

s3, inserting the spiral part of the connecting rod into the upper end of the spring main body part and screwing the spiral part, and connecting the upper end of the rubber sleeve to the groove of the connecting rod;

s4, the cover body is arranged above the chassis, the connecting sleeve is aligned with the head of the connecting rod and pressed downwards, and the head enters the accommodating portion, so that assembly is completed.

After the chassis and the connecting piece are assembled, the bottom of the spring is clamped between the base and the chassis connecting part, and the upper end and the lower end of the spring are fastened. In the installation process, fasteners such as screws do not exist in the connection among the base, the connecting rod and the spring, the assembly is convenient, and tools are not needed in the assembly process. In addition, the structure of the connecting device is relatively simple, so that the operation is more reliable and the cost is lower.

After the assembly is completed, the head part of the connecting rod can rotate relative to the connecting sleeve, and the spiral part of the connecting rod can move up and down or rotate against the elastic force of the spring, so that the connecting rod can rotate relative to the chassis and/or move up and down, left and right. Therefore, the cover body of the mower can be allowed to move relative to the chassis, such as translating and/or rotating, when the cover body of the mower encounters an abnormal condition, such as collision with foreign matters or being lifted by people, in the working process of the mower, so that the control device is triggered to perform corresponding actions, and the mower is controlled to stop working or retreat. Further, when the mower is released from the abnormal condition, the mower can be restored to the normal working state through the reset action of the spring.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. A lawnmower comprising a cover and a chassis located beneath the cover, wherein the cover is movably connected to the chassis by a connection device, wherein the connection device comprises:

the base is detachably and fixedly connected to the chassis;

a linkage movably coupled at a first end to the cover; and

2. The lawnmower of claim 1, wherein the base is fixedly and tool-lessly removably attached to the chassis.

3. The mower of claim 1 wherein the base is fixedly attached to the chassis by a snap-fit arrangement.

4. A lawnmower as claimed in claim 1, wherein the connecting means is further provided with a connecting sleeve connected to the cover, the first end of the linkage being movably connected to the connecting sleeve.

5. A lawnmower as claimed in claim 4, wherein one of the outer wall of the connecting sleeve and the cover is provided with a recess and the other is provided with a projection which engages with the recess, the connecting sleeve and the cover being connected to each other by engagement of the recess and the projection.

6. The mower of claim 1, wherein the base is provided with a hook, the chassis is provided with a slot, and the base is fixed to the chassis by the engagement of the hook and the slot.

7. The mower according to claim 1, wherein the base has a plate-shaped body, two elastic arms respectively extend from two opposite sides of the plate-shaped body, and the ends of the elastic arms are provided with hooks.

8. The mower of claim 1 wherein said base has a plate-like body, said chassis defining a receiving cavity having an open end, said plate-like body covering said open end.

9. The lawnmower of claim 1, wherein the linkage is further movably mounted to the chassis, the base is located below the linkage, and the resilient member is mounted between the linkage and the base.

10. The lawnmower of claim 1, wherein the outside edge of the chassis is provided with a mounting wall having a through hole therethrough, and the linkage has, in order from top to bottom, a head movably coupled to the cover, a stem passing through the through hole, and a shoulder located below the mounting wall, and wherein the first end of the spring is connected to the end of the linkage located below the shoulder, and the second end of the spring is connected to the base.

11. The mower of claim 10 wherein a mounting post extends from a lower surface of said shoulder and a post extends from an upper surface of said base, wherein a first end of said resilient member is mounted to said mounting post and a second end of said resilient member is mounted to said post.

12. The lawnmower of claim 1, wherein the linkage is further movably mounted to the chassis, the base is provided with a through hole, a first end of the resilient member passes through the through hole and is connected to a second end of the linkage, and a second end of the resilient member is connected to a lower end of the base.

13. The mower of claim 1, wherein the link comprises a head portion, a shaft portion and a spiral portion in sequence from top to bottom, wherein the head portion is movably connected to the cover, the shaft portion is rod-shaped, the spiral portion is provided with a spiral groove, and a first end of the elastic member is engaged with the spiral groove to connect the elastic member to the link.

14. The mower according to claim 13, wherein the tip of the spiral part is provided with a projection projecting radially from the outer wall of the spiral part, and the spiral part is hollow inside and provided with a recess penetrating the outer wall of the spiral part.

15. The mower according to claim 1, wherein the base has a plate-shaped body, the lower surface of the plate-shaped body extends downward with a resilient arm at opposite sides, the resilient arm is provided with a hook at the end, the chassis is provided with a slot, the hook is snap-fitted with the slot, the plate-shaped body is provided with a through hole at the middle portion, the first end of the resilient member passes through the through hole and is connected to the second end of the connecting rod, and the second end of the resilient member is connected to the lower end of the base.

16. The mower of claim 15, wherein a boss integrally extends from a lower surface of the plate-shaped body, and a bottom surface of the boss presses against a bottom of the elastic member.

17. The mower of claim 15 wherein the resilient member is a spring having a body portion and a base portion below the body portion, the body portion passing through the through hole and being fixedly connected to the second end of the linkage, and the base portion below the through hole and abutting the base.

18. The mower of claim 17 wherein the spring is integrally formed from the body portion and the bottom portion.

19. The mower of claim 17 wherein the outer diameter of the main body portion of the spring is less than the inner diameter of the through hole of the base, and the inner diameter of the through hole of the base is less than the outer diameter of the bottom of the spring.

20. The mower of claim 17 wherein the main body portion is configured as a garter spring and the base portion is configured as a frusto-conical spring, a flat spiral spring, or a helical cylindrical spring.

21. The mower according to claim 13, wherein said connecting means further comprises a rubber sleeve, said connecting rod further comprises a groove portion between said rod portion and said spiral portion, said groove portion is provided with an annular groove, and said base has a plate-like body and a boss integrally and upwardly protruding from said plate-like body, an outer side wall of said boss is provided with a groove, wherein a bottom end of said rubber sleeve is connected to said groove of said boss, and a top end of said rubber sleeve is connected to said annular groove of said connecting rod.

22. The mower of claim 1, wherein the attachment device further comprises a rubber sleeve, wherein a top end of the rubber sleeve is fixedly attached to the linkage, a bottom end of the rubber sleeve is fixedly attached to an upper end of the base, and the rubber sleeve surrounds at least a portion of the resilient member extending above the base.

23. A lawnmower according to any one of claims 1 to 16, 21 and 22, wherein the resilient member is a spring.