Angle-adjustable grass trimmer head

Abstract

The present invention relates to an angle-adjustable grass trimmer head. The grass trimmer head comprises a housing, a power transmission mechanism and an angle adjustment mechanism. The housing is composed of an upper housing and a lower housing. Both the upper housing and the lower housing are L-shaped tubes. The upper housing and the lower housing transverse tube are mutually movable and fixed and can rotate freely. The power transmission mechanism comprises a driving gear, a transmission gear and an output gear, which are all fan-shaped gears. The driving gear is arranged in a vertical tube of the upper housing, the transmission gear is arranged in a transverse tube where the upper housing and the lower housing are mutually movable and fixed, and the output gear is arranged in the vertical tube of the lower housing. At the same time, the driving gear is connected to a driving shaft in a handle bar and transmits power to the transmission gear and the output gear. Due to the meshing of the fan-shaped gears, the connecting gears are neither damaged nor affected in terms of power output. The angle adjustment mechanism is composed of a latch and a latch seat arranged on the lower housing and fixed to an adjustment sheet arranged on the upper housing. The latch passes through a latch seat fixing portion and is plugged into an adjustment hole of the adjustment sheet.

Description

Technical Field

[0001] The invention relates to a grass trimmer head, in particular to a grass trimmer head of a gasoline powered grass trimmer. Background Art

[0002] At present, lawn mowers are generally divided into electric mowers and gasoline-powered mowers. The power mechanism of the electric mower is located in the head of the mower. Therefore, the angle adjustment mechanism at the connection between the head and the handle does not affect the power output of the power mechanism. However, due to the capacity of the battery, the electric mower has a short service life and a heavy head, which greatly affects the work efficiency. In the gasoline-powered mower, the gasoline engine of the power mechanism is located at the rear end of the handle. The output shaft of the gasoline engine is connected to the output shaft of the head through the drive shaft located in the handle. The output shaft of the head and the drive shaft are connected through The two sector gears are connected and meshed at a fixed angle. Therefore, the mower heads of existing gasoline-powered mowers are all 7-shaped integrated parts. If a movable connection is directly set at the bend of the mower head for adjusting the angle between the mower head and the handle rod, then when the angle of the mower head changes, the sector gear of the output shaft of the mower head and the sector gear of the drive shaft cannot be tightly meshed, which not only affects the power output but also easily damages the gears. Therefore, the angle of the head of the existing gasoline-powered mowers cannot be adjusted. The inability to adjust the angle will affect the work efficiency of the workers and the effect of mowing the lawn. Summary of the invention

[0003] In view of the defects of the existing gasoline-powered lawn mower heads, the technical problem to be solved by the present invention is to provide a lawn mower head with an adjustable angle that does not affect the power output and does not damage the connecting gears.

[0004] In order to achieve the above object, according to one aspect of the present invention, the present invention is implemented by the following technical measures: an angle-adjustable grass trimmer head, comprising:

[0005] The housing is composed of an upper housing and a lower housing, both of which are L-shaped tubes, and the upper housing and the lower housing transverse tube are movably fixed to each other so that the upper housing and the lower housing can rotate freely;

[0006] A power transmission mechanism, the power transmission mechanism includes a driving gear, a transmission gear and an output gear, the driving gear, the transmission gear and the output gear are all sector gears, and the driving gear is arranged in the vertical tube of the upper shell, the transmission gear is arranged in the horizontal tube where the upper shell and the lower shell are movably fixed to each other, and the output gear is arranged in the vertical tube of the lower shell, and the driving gear is connected to the driving shaft in the handle bar and transmits power to the transmission gear and the output gear, and the output gear is also fixed with an output shaft;

[0007] An angle adjustment mechanism, the angle adjustment mechanism is composed of an adjustment plate, a latch seat fixing part, a latch and a spring, the adjustment plate is arranged on the upper shell, and a row of adjustment holes are provided on the adjustment plate, the latch seat fixing part is arranged on the lower shell, the latch passes through the latch seat fixing part and is inserted into the adjustment hole, and the latch can be separated from the adjustment hole by pulling the latch, and at the same time, the latch is prevented from being separated from the adjustment hole without external force by the elastic force of the spring arranged thereon.

[0008] The angle-adjustable grass trimmer head is movably fixed by an L-shaped upper shell and a lower shell, and a driving gear and an output gear are connected between the transmission shaft and the transmission gear. The angle of the gasoline-powered grass trimmer head can be adjusted without changing the meshing degree of each connecting gear, thereby not damaging the connecting gears and not affecting the power output.

[0009] Furthermore, the driving gear is fixed in the vertical tube of the upper shell, and the fan end of the driving gear extends into the horizontal tube of the upper shell, the output gear is fixed in the vertical tube of the lower shell, and the fan end of the output gear extends into the horizontal tube of the lower shell, and there are two transmission gears, and the two transmission gears are connected by a transmission shaft. The above design has a reasonable structure, is easy to install, and has relatively stable power transmission.

[0010] Furthermore, the driving gear, transmission gear and output gear in the upper shell and the lower shell are all provided with bearings, wherein the bearings on the driving gear and the output gear are sleeved on the driving gear and the output gear and contact the inner tube wall of the upper shell and the lower shell, and the bearing on the transmission gear is inserted into the transmission shaft. The above design is to reduce friction, and the gears are fixed more firmly and are not easy to shake.

[0011] Furthermore, a plug-in tube extends from one side of the transverse tube of the upper shell, which is plugged into the transverse tube of the lower shell to movably fix the upper shell and the lower shell, and a fastening bolt is plugged into the bearing in the transmission shaft, and both ends of the fastening bolt extend out of the transverse tubes of the upper shell and the lower shell, and nuts are screwed on both ends of the fastening bolt, and the angle between the upper shell and the lower shell is fixed by the nuts. The above design structure is simple and reasonable, and at the same time, due to the large torque when the machine head is used, the life of the latch is increased.

[0012] Furthermore, the upper shell and the lower shell are both provided with bolt holes for the fastening bolts to be screwed in. The above design allows the fastening bolts to be directly fixed, so that the nuts only have the functions of limiting and auxiliary locking, and the structure is more reliable.

[0013] Furthermore, the side of the plug inserted in the adjustment hole is a conical head, the diameter of the conical head is larger than the return spring, so that one end of the spring can abut against the conical head, and the other end abuts against the plug seat fixing part, and the plug away from the conical head side passes through the plug seat fixing part and is fixed to the pull handle. The above structure is simple and reasonable.

[0014] Furthermore, a threaded center hole is provided at the center of the bolt seat fixing part, a bolt seat is screwed into the threaded center hole, a bolt seat fixing part extends from the side of the bolt seat away from the adjustment hole and is fixed to the clamping plate, a plug block fixed to the clamping plate is provided on the pull handle, and the bolt passes through the bolt seat and is fixed to the pull handle. The above design makes the bolt more stable when pulled out, and will not cause shaking problems, which is convenient for subsequent reset and reinsertion into the adjustment hole.

[0015] Compared with the prior art, the invention has the advantages of achieving angle adjustment of the head of a gasoline-powered grass trimmer without changing the meshing degree of each connecting gear, thereby neither damaging the connecting gears nor affecting the power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the parts of a grass trimmer head with adjustable angle according to the present invention.

[0018] Explanation of the accompanying drawings: 1. Upper shell; 2. Lower shell; 3. Adjustment plate; 4. Adjustment hole; 5. Plug tube; 6. Latch seat fixing part; 7. Bolt hole; 8. Drive gear; 9. Transmission gear; 10. Output gear; 11. Output shaft; 12. End cover; 13. Fastening bolt; 14. Nut; 15. Transmission shaft; 16. Bearing; 17. Latch; 18. Conical head; 19. Latch seat; 20. Clamp; 21. Pull handle; 22. Plug block. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0020] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "bottom", "top", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] Example 1

[0022] Please refer to Figure 1The present embodiment provides an angle-adjustable grass trimmer head, comprising an upper shell 1, a lower shell 2, an output shaft 11, an output gear 10, a transmission shaft 15, a transmission gear 9, a driving gear 8, a bearing 16, a fastening bolt 13, an end cover 12 and an angle adjustment device. The upper shell 1 and the lower shell 2 are both L-shaped aluminum alloy round tubes. A plug-in tube 5 with a diameter smaller than that of the horizontal tube is extended outward from the horizontal tube mouth of the upper shell 1. The upper shell 1 is plugged with the horizontal tube of the lower shell 2 through the plug-in tube 5, so that the upper and lower shells can rotate freely. The closed ends of the horizontal tubes of the upper shell 1 and the lower shell 2 are both provided with bolt holes 7 at the centers, and the stepped mouth of the horizontal tube of the upper shell 1 extends upward. An arc-shaped adjustment sheet 3 is extended, and a row of adjustment holes 4 are opened on the adjustment sheet 3. A latch seat fixing portion 6 is fixed above the horizontal tube of the lower shell 2, and the center hole of the latch seat fixing portion 6 is a threaded through hole. The drive gear 8, the transmission gear 9 and the output gear 10 are all fan-shaped gears. The drive gear 8 is fixed in the vertical tube of the upper shell 1 through a bearing 16, and the fan end of the drive gear 8 extends into the horizontal tube of the upper shell 1. At the same time, the rear end of the drive gear 8 is connected to the drive shaft in the handle bar. The output gear 10 is fixed in the vertical tube of the lower shell 2 through a bearing 16, and the fan end of the output gear 10 extends into the horizontal tube of the lower shell 2. The lower end of the output gear 10 is fixed The output shaft 11, the end cover 12 has a center hole in the center, and after the center hole of the end cover 12 passes through the output shaft 11, the end cover 12 is screwed on the lower shell 2 to close the lower shell 2, the fastening bolt 13 is inserted from the bolt hole 7 of the lower shell 2, and passes out from the bolt hole of the upper shell 1, and a nut 14 is screwed on each end of the fastening bolt 13, a bearing is fixed on the fastening bolt 13, and a transmission shaft 15 is connected to the bearing sleeve, and a transmission gear 9 is fixed on each end of the transmission shaft 15, and the two transmission gears 9 are respectively meshed with the driving gear 8 and the output gear 10. In addition to the latch seat fixing portion 6 and the adjustment sheet 3, the angle adjustment device also includes a latch seat 19, a latch 17, handle 21, reset spring, one end of the latch seat 19 is a hollow threaded tube, the other end is a hexagonal nut, and two parallel clamping plates 20 extend from the hexagonal nut, the hollow threaded tube end of the latch seat 19 is screwed in from the right end of the latch seat fixing portion 6 of the lower shell 2, and the left end of the handle 21 extends with a plug block 22 plugged into the two clamping plates 20 of the latch seat 19, the left end of the latch 17 is a conical head 18, and the right side diameter of the conical head 18 is larger than the diameter of the latch 17 body, the right end of the latch 17 passes through the spring and the center of the latch seat 19 and is plugged into the handle 21, and the conical head 18 of the latch 17 is plugged into the adjustment hole 4 of the adjustment plate 3 and is tightened by the spring.

[0023] The angle-adjustable grass trimmer head provided in the present embodiment needs to adjust its angle. First, loosen the nut 14 at one end of the fastening bolt 13, then pull out the conical head 18 of the pin 17 of the angle adjustment device from the adjustment hole 4 of the adjustment plate 3, and then rotate the lower shell 2 so that the vertical tube of the lower shell 2 and the vertical tube of the upper shell 1 form a suitable angle, and then release the pull handle 21 of the pin 17. The pin 21 is reinserted into the other adjustment hole 4 of the adjustment plate 3 under the action of the spring to fix the upper and lower shells, and then tighten the nut 14 at one end of the fastening bolt 13. During the rotation of the lower shell 2 around the upper shell 1, the output gear 10 rotates around the transmission gear 9, while the transmission gear 9 and the drive gear 8 do not move. Therefore, the angle-adjustable grass trimmer head of the present invention connects the drive gear 8 and the output gear 11 through the transmission shaft 15 and the two transmission gears 9, which can realize the angle adjustment of the gasoline-powered grass trimmer head without changing the meshing degree of each connecting gear, and will neither damage the connecting gear nor affect the power output.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An angle-adjustable grass trimmer head, characterized in that: include: The housing is composed of an upper housing and a lower housing, both of which are L-shaped tubes, and the upper housing and the lower housing transverse tube are movably fixed to each other so that the upper housing and the lower housing can rotate freely; A power transmission mechanism, the power transmission mechanism includes a driving gear, a transmission gear and an output gear, the driving gear, the transmission gear and the output gear are all sector gears, and the driving gear is arranged in the vertical tube of the upper shell, the transmission gear is arranged in the horizontal tube where the upper shell and the lower shell are movably fixed to each other, and the output gear is arranged in the vertical tube of the lower shell, and the driving gear is connected to the driving shaft in the handle bar and transmits power to the transmission gear and the output gear, and the output gear is also fixed with an output shaft; An angle adjustment mechanism, the angle adjustment mechanism is composed of an adjustment plate, a latch seat fixing part, a latch and a spring, the adjustment plate is arranged on the upper shell, and a row of adjustment holes are provided on the adjustment plate, the latch seat fixing part is arranged on the lower shell, the latch passes through the latch seat fixing part and is inserted into the adjustment hole, and the latch can be separated from the adjustment hole by pulling the latch, and at the same time, the latch is prevented from being separated from the adjustment hole without external force by the elastic force of the spring arranged thereon.

2. The angle-adjustable grass trimmer head according to claim 1, characterized in that: The driving gear is fixed in the vertical tube of the upper shell, and the fan end of the driving gear extends into the horizontal tube of the upper shell. The output gear is fixed in the vertical tube of the lower shell, and the fan end of the output gear extends into the horizontal tube of the lower shell. There are two transmission gears, and the two transmission gears are connected by a transmission shaft.

3. The angle-adjustable grass trimmer head according to claim 1 or 2, characterized in that: The driving gear, transmission gear and output gear in the upper shell and the lower shell are all provided with bearings, wherein the bearings on the driving gear and the output gear are sleeved on the driving gear and the output gear and are in contact with the inner tube walls of the upper shell and the lower shell, and the bearings on the transmission gear are inserted into the transmission shaft.

4. The angle-adjustable grass trimmer head according to claim 3, characterized in that: A plug-in tube extends from one side of the transverse tube of the upper shell, and the plug-in tube is inserted into the transverse tube of the lower shell to movably fix the upper shell and the lower shell. A fastening bolt is inserted into the bearing in the transmission shaft, and both ends of the fastening bolt extend out of the transverse tubes of the upper shell and the lower shell, and nuts are screwed on both ends of the fastening bolts to fix the angle between the upper shell and the lower shell.

5. The angle-adjustable grass trimmer head according to claim 4, characterized in that: The upper shell and the lower shell are both provided with bolt holes for threaded connection of fastening bolts.

6. The angle-adjustable grass trimmer head according to claim 1, characterized in that: The pin has a conical head on one side inserted into the adjustment hole, and the diameter of the conical head is larger than the return spring, so that one end of the spring can abut against the conical head and the other end abuts against the pin seat fixing part. The pin away from the conical head side passes through the pin seat fixing part and is fixed to the pull handle.

7. The angle-adjustable grass trimmer head according to claim 6, characterized in that: A threaded center hole is provided in the center of the latch seat fixing part, and a latch seat is screwed into the threaded center hole. A latch seat fixing part extends from the side of the latch seat away from the adjustment hole and is fixed to the clamp plate. A plug block fixed to the clamp plate is provided on the pull handle, and the pin passes through the latch seat and is fixed to the pull handle.

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