CN214046678U - Grass trimmer - Google Patents

Abstract

The utility model discloses a grass trimmer, include: a front end housing formed with an accommodating chamber; a grass cutting head connected to the front end housing; the motor is arranged in the accommodating cavity and comprises an output shaft for driving the grass cutting head; a rear end housing formed with a coupling portion for connecting a power supply device; a connecting rod assembly connecting the rear end housing and the front end housing; the link assembly includes: a first rod member arranged to connect the front end housing; a second rod member configured to connect the first rod member and the rear end housing; the first rod piece is movably connected with the second rod piece, the first rod piece comprises a first length in a storage state and a second length in a working state, and the ratio of the first length to the second length is greater than or equal to 0.4 and less than or equal to 0.6. The grass trimmer is convenient to operate and operate.

Description

Grass trimmer

Technical Field

The utility model relates to a garden instrument technical field especially relates to machine of beating grass.

Background

In the gardening field, the use of the grass trimmer is indispensable. The grass trimmer comprises a grass trimming head and a grass trimming rope arranged on the grass trimming head, wherein the grass trimming head drives the grass trimming rope to rotate so as to realize a cutting function when rotating at a high speed, and the grass trimming rope is mainly used for trimming lawns.

Handheld lawn mowers are preferred for their small size and light weight. The handheld grass trimmer comprises an extension rod, wherein a grass trimming head is arranged at one end of the extension rod, and the grass trimming head is connected with the extension rod through a front end shell. The existing connecting rod assembly has limited telescopic function, and is inconvenient for a user to operate.

SUMMERY OF THE UTILITY MODEL

For solving the deficiencies of the prior art, the object of the utility model is to provide a grass trimmer which can be operated and adjusted conveniently.

In order to achieve the above object, the utility model adopts the following technical scheme:

a lawnmower comprising: a front end housing formed with an accommodating chamber; a grass cutting head connected to the front end housing; the motor is arranged in the accommodating cavity and comprises an output shaft for driving the grass cutting head; a rear end housing formed with a coupling portion for connecting a power supply device; a connecting rod assembly connecting the rear end housing and the front end housing; the link assembly includes: a first rod member arranged to connect the front end housing; a second rod member configured to connect the first rod member and the rear end housing; the first rod piece is movably connected with the second rod piece, the first rod piece comprises a first length in a storage state and a second length in a working state, and the ratio of the first length to the second length is greater than or equal to 0.4 and less than or equal to 0.6.

Further, the ratio of the first length to the second length is greater than or equal to 0.45 and less than or equal to 0.55.

Further, the connecting rod assembly comprises an operating part connected with the second rod in a sliding mode, and the connecting rod assembly is provided with a second length when the operating part is basically overlapped relative to the second rod and a third length when the operating part and the second rod generate relative displacement.

Further, the first length is less than the second length, which is less than the third length.

Further, the ratio of the second length to the third length is greater than or equal to 0.8 and less than 1.

Further, the ratio of the second length to the third length is greater than or equal to 0.85 and less than or equal to 0.95.

Further, the front end housing includes a first housing portion and a second housing portion, and the first housing portion is provided in a half-cylindrical shape.

Further, the second housing portion includes a first housing and a second housing, and the first housing and the second housing are connected to form a mounting hole for connecting the link assembly.

Further, still include the housing, the housing is connected with second casing portion is dismantled.

Furthermore, the power supply device is arranged at one end, far away from the front end shell, of the connecting rod assembly.

The utility model discloses an useful part lies in: through setting up the link assembly that can buckle, stretch out and draw back in the certain limit for the machine of beating grass is convenient for user's operation and regulation more.

Drawings

FIG. 1 is a schematic perspective view of a grass trimmer according to an embodiment of the present invention;

FIG. 2 is a schematic view of a three-dimensional structure of the lawn mower in a folded state according to an embodiment of the present invention;

FIG. 3 is an exploded view of a part of the structure of the grass trimmer according to the embodiment of the present invention;

FIG. 4 is a schematic view of another angle of the lawnmower of FIG. 2;

FIG. 5 is an enlarged view at A of FIG. 3;

fig. 6 is an exploded schematic view of another part of the structure of the grass trimmer provided by the embodiment of the invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a grass trimmer 100, including a grass trimming head 11, a front housing 12 and a connecting rod assembly 13, a motor is accommodated in the front housing 12, and the grass trimming head 11 can be connected to the front housing 12 and can be driven by the motor disposed inside the front housing 12 to trim grass. The link assembly 13 is connected at one end to the front end housing 12 and at the other end to the rear end housing 17, and the rear end housing 17 is provided with a coupling portion 171 for connection to a power supply device (not shown). The grass cutting head 11 is connected to the lower side of the front end housing 12, and the link assembly 13 is connected to the obliquely upper side of the front end housing 2.

The inside of the grass mowing head 11 is provided with a spool which is used for winding a grass mowing rope, and a through hole for the grass mowing rope to penetrate out is formed in the shell of the grass mowing head 11. Reference is made to the prior art with regard to the detailed construction of the grass-mowing head 11.

The lawn mower 100 further comprises an operating portion 14, wherein the rear end housing 17 and the operating portion 14 are arranged at one end of the connecting rod assembly 13 far away from the front end housing 12 to balance the weight of the two ends of the connecting rod assembly 13, the rear end housing 17 is arranged at the rear end of the operating portion 14, operation and control of an operator are not affected, and the power supply device arranged on the combining portion 171 is convenient to install and detach. The power supply device is used for supplying power to the motor, and the operation part 14 is used for controlling the starting and stopping of the motor, namely the operation part 14 controls the on-off of a circuit between the power supply device and the motor.

Specifically, the operation unit 14 includes a control switch 141 and a trigger 142, the control switch 141 is disposed on the upper side of the link assembly 13, the trigger 142 is disposed on the lower side of the link assembly 13, the control switch 5 is connected to the power supply device through a power supply circuit, the control switch 5 is connected to the motor through a control circuit, and the trigger 142 is used for controlling the on/off of the power supply circuit. When the motor is used, the motor can be started by firstly pressing the trigger 142 and then pressing the control switch 141, and the setting of the trigger 142 prevents the motor from being suddenly started due to mistaken touch of the control switch 141. One or more control switches 141 can be set, not only start and stop but also speed regulation can be realized, and the prior art can be referred to for a specific switch structure.

As shown in fig. 1 to 2, the connecting rod assembly 13 may be a complete long rod or may be formed by connecting multiple long rods. As a specific embodiment, the connecting rod assembly 13 is formed by connecting a first rod 131 and a second rod 132, and the connecting rod assembly 13 is easy to store and transport. In this embodiment, the first rod 131 and the second rod 132 are movably connected and can be fixed to form a longer connecting rod assembly 13, thereby facilitating the operation of the user; or can be folded to form two substantially parallel bars for ease of storage and transport. Specifically, the first rod 131 is provided at the front end, and is provided with one end connected to the front end housing 12 and the other end connected to the second rod 132. The second rod 132 is disposed at the rear end and is configured to have one end connected to the first rod 131 and the other end connected to the rear end housing 17. More specifically, the second rod 132 is also configured to be slidably connected to the operation portion 14, i.e., at least a portion of the second rod 132 is configured as an inner layer and the operation portion 14 is configured as an outer layer. The outer layer of the connecting rod assembly 13 is wrapped around the outer periphery of the inner layer. Wherein the thickness of the inner layer member is also set to be greater than that of the outer layer member, and the inner layer member and the outer layer member are both made of a carbon fiber material.

When the first link 131 and the second link 132 are folded and the second link 132 and the operating portion 14 substantially coincide and are in the collapsed state, the link assembly 13 has a first length; when the first rod 131 and the second rod 132 are fixedly connected and extend substantially in a straight direction, and the second rod 132 and the operating portion 14 substantially coincide, the link assembly 13 has a second length; when the first link 131 and the second link 132 are fixedly connected and extend substantially in a straight direction, the second link 132 and the operating portion 14 are relatively displaced, and the second link 132 and the operating portion 14 have the maximum relative length, the link assembly 13 has the third length. The first length is smaller than the second length, and the second length is smaller than or equal to the third length. The first length is set to the shortest length of the link assembly 13 in the stored state, the second length is set to the shortest length of the link assembly 13 in the operating state, and the third length is set to the longest length of the link assembly 13 in the operating state. The ratio of the first length to the second length is greater than or equal to 0.4 and less than or equal to 0.6; the ratio of the second length to the third length is greater than or equal to 0.8 and less than or equal to 1. Preferably, the ratio of the first length to the second length is greater than or equal to 0.45 and less than or equal to 0.55, and the ratio of the second length to the third length is greater than or equal to 0.85 and less than or equal to 0.95. Setting the second and third lengths of the linkage assembly 13 to have the ratio ranges described above allows the lawnmower 100 to have different extended lengths when operated, thereby accommodating operation by people of different heights and sizes. In addition, the second length and the third length are configured to have a larger ratio range, which allows the linkage assembly 13 of the lawnmower 100 to be adjusted over a larger range, thereby accommodating a larger number of people. In addition, when the second rod 132 and the operation portion 14 are substantially overlapped and in the contracted state, the ratio of the first rod 131 to each of the second rod 132 and the operation portion 14 when the second rod 132 and the operation portion 14 are relatively displaced and the second rod 132 and the operation portion 14 have the maximum relative length is set to 0.7 or more and 1 or less. With this arrangement, the first rod 131 and the second rod 132 can be extended sufficiently after being connected, and the space occupied by the two rods when being stored is small.

The lawn mower 100 further includes a handle 15, and the handle 15 is disposed at a front end of the operating portion 14 and is held by an operator. The handle 15 is provided on the linkage assembly 13 relatively close to the power supply means so that the operator can lift the lawnmower 100 with less effort. In use, the handle 15 can be held by the left hand and the control switch 141 and the operating member 52 can be operated by the right hand.

As shown in fig. 3 to 5, the front housing 12 includes a first housing part 121 and a second housing part 124, and the second housing part 124 is detachably connected to the first housing part 121. Wherein, the first housing part 121 is connected with the grass-mowing head 11 and is provided with a containing cavity (not shown) for containing a motor; the second housing portion 124 is configured to be coupled to the linkage assembly 13. First housing portion 121 is made of a first material; the second housing portion 124 is made of a second material. Specifically, first housing portion 121 is made of metal, and second housing portion 124 is made of plastic; the connection interface of the first housing part 121 and the second housing part 124 is parallel to or intersects with the output shaft of the motor. The first housing part 121 is made of metal, so that the first housing part 121 can have certain strength, and the texture of the product can be effectively improved; the second housing portion 124 is made of plastic, which controls the weight and reduces the cost of the front housing 12; the first housing part 121 and the second housing part 124 are detachably connected, and different materials are combined, so that the texture of the grass trimmer 100 is improved, and the technical effects of reducing weight and reducing cost can be achieved. When the grass trimmer 100 is in a working state, the grass-mowing head 11 collides with the ground when performing grass-mowing operation, and particularly, certain impact is generated on the front-end shell 12 by actions of falling, knocking, paying off and the like. Since the first housing part 121 and the second housing part 124 are detachably connected, a certain connection strength is required between the first housing part 121 and the second housing part 124. As an implementation manner, a connection interface between the first housing part 121 and the second housing part 124 is parallel to or intersects with an output shaft of the motor, so that the whole formed by connecting the first housing part 121 and the second housing part 124 is more stable; in addition, the installation and the disassembly are convenient, the shape of the first housing part 121 is regular, the processing and the production are convenient, and the connection with the motor is facilitated.

In the present embodiment, first housing part 121 is made of aluminum alloy. The aluminum alloy is light in weight and long in service life. Of course, other metals may be selected for first housing portion 121 as desired. The second housing portion 124 is made of PA6-GF 30. PA6-GF30 is a conventional material, and is commonly used in power tools, and is not described in detail herein. Specifically, the first housing part 121 is connected to the housing of the grass cutting head 11, and may be clamped or screwed, which is not limited herein.

In this embodiment, the first housing part 121 is clamped to the second housing part 124, so as to facilitate manufacturing, installation and disassembly. Specifically, a protrusion 122 is disposed on the first housing part 121, and a groove 124e capable of being engaged with the protrusion 122 is disposed on the second housing part 124. When the first housing part 121 and the second housing part 124 are assembled, the first housing part 121 and the second housing part 124 are close to each other and pressed, and since the second housing part 124 is made of plastic, the groove 124e is deformed under the action of a force, so that the protrusion 122 is pressed into the groove 124e, and the first housing part 121 and the second housing part 124 are clamped. Of course, in other embodiments, fixing means such as bonding or screw fastening between the first housing part 121 and the second housing part 124 may be provided, and the fixing means is not limited herein.

In the present embodiment, the first rod 131 is detachably connected to the front end housing 12. Specifically, the second housing portion 124 includes a first housing 124a and a second housing 124 b. The first housing 124a and the second housing 124b are connected to form the second housing portion 124. The first housing 124a and the second housing 124b are respectively formed with a coupling hole to which coupling is possible and an accommodating space for accommodating at least part of the link assembly 13. After the first housing 124a and the second housing 124b are connected, a mounting hole 124d is formed, the connecting rod assembly 13 is inserted into the mounting hole 124d, and the connecting rod assembly 13 and the second housing 124 can be clamped or screwed. In the present embodiment, the connecting rod assembly 13 is connected to the second housing portion 124 by screws. The mounting hole 124d is located at one end of the second housing part 124, and the groove 124e is located at the other end of the second housing part 124. One end of second housing portion 124 is connected to first housing portion 121, and the other end of second housing portion 124 extends obliquely upward relative to first housing portion 121, so that link assembly 13 can be tilted upward for easy handling.

The lawn mower 100 further comprises a wire, wherein the wire penetrates through the first housing part 121, the second housing part 124 and the connecting rod assembly 13, so that the wire is protected, and the space is fully utilized.

Specifically, the first housing portion 121 is provided with a threading hole 123 communicating with the accommodating cavity, and the threading hole 123 communicates with the inside of the second housing portion 124. The accommodating cavity and the threading hole 123 provide an accommodating space for the wire. Simultaneously, accept the chamber and can the holding motor for the output shaft of motor wears out to accept the chamber and is connected with the portion of beating the grass of beating grass head 11, and make full use of space reduces the axial dimension of beating the grass head 11.

The outer surface of the first housing part 121 can be arc-shaped, so that edges and corners are reduced, and abrasion caused by scraping is reduced. As one implementation, first housing portion 121 is provided as a cylindrical structure. Specifically, first housing part 121 may be formed in an 3/4 cylinder shape or a 1/2 cylinder shape to satisfy structural strength, and form a receiving cavity capable of receiving at least a part of the motor and ensuring that the motor is fixed at a predetermined position. The first housing part 124 may be provided as a metal material or a plastic material. When the first housing portion 124 is provided as a metallic material, its structural strength is substantially satisfactory; when the first housing part 124 is provided as a plastic material, the structural strength of the first housing part 124 may be increased by providing a reinforcing structure. It can be understood that the first housing part 121 is configured to be a half cylinder, which occupies a smaller volume, and the smaller the volume is, the lighter the mass of the first housing part 121 is, so that the weight of the whole front housing 12 can be reduced, and the operation by the user is more convenient.

The lawnmower 100 further includes a housing 16, the housing 16 being removably connected to the second housing portion 124. The cover 16 is arranged at the lower side of the second shell 124b and surrounds part of the grass mowing head 11, so that grass clippings generated in the grass mowing process do not affect an operator, and the grass mowing rope can be prevented from hurting the operator.

For the lawn mower 100 with the automatic line releasing and/or automatic line collecting function, the switch button 124c is arranged on the second housing part 124, and the switch button 124c is arranged to include a sealing structure, which can effectively cover the switch button 124c and can prevent dust, water and the like from entering the inside of the switch button 124c, thereby affecting the service life of the switch button 124 c.

By operating the switch button 124c, automatic paying-off and automatic winding-up can be realized, namely, the grass-mowing rope on the grass-mowing head 11 is adjusted. The automatic wire releasing and wire retrieving functions are not described herein, and reference may be made to the prior art.

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 adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. A lawnmower comprising:

a front end housing formed with an accommodating chamber;

a grass cutting head connected to the front end housing;

the motor is arranged in the accommodating cavity and comprises an output shaft for driving the grass cutting head;

a rear end housing formed with a coupling portion for connecting a power supply device;

a linkage assembly connecting the rear end housing and the front end housing;

characterized in that, link assembly includes:

a first rod member configured to connect the front end housing;

a second rod configured to connect the first rod and the rear end housing;

the first rod piece is movably connected with the second rod piece, the connecting rod assembly comprises a first length in a storage state and a second length in a working state, and the ratio of the first length to the second length is greater than or equal to 0.4 and less than or equal to 0.6.

2. A lawnmower according to claim 1,

the ratio of the first length to the second length is greater than or equal to 0.45 and less than or equal to 0.55.

3. A lawnmower according to claim 1,

the linkage assembly has a second length when the operating portion is substantially coincident with the second link and a third length when the operating portion is displaced relative to the second link.

4. A lawnmower according to claim 3,

the first length is less than the second length, which is less than the third length.

5. A lawnmower according to claim 4,

the ratio of the second length to the third length is greater than or equal to 0.8 and less than 1.

6. A lawnmower according to claim 4,

the ratio of the second length to the third length is greater than or equal to 0.85 and less than or equal to 0.95.

7. A lawnmower according to claim 1,

the front end housing includes a first housing portion and a second housing portion, and the first housing portion is provided in a half-cylindrical shape.

8. A lawnmower according to claim 7,

the second housing portion comprises a first housing and a second housing, and a mounting hole for connecting the connecting rod assembly is formed by connecting the first housing and the second housing.

9. A lawnmower according to claim 7,

still include the housing, the housing with the second casing portion can dismantle the connection.

10. A lawnmower according to claim 1,

the power supply device is arranged at one end, far away from the front end shell, of the connecting rod assembly.

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