CN116533328A

CN116533328A - Chain saw

Info

Publication number: CN116533328A
Application number: CN202210096611.5A
Authority: CN
Inventors: 肖明贵; 刘来
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2023-08-04

Abstract

The invention discloses a chain saw, comprising: a housing forming an accommodating space, the housing including a grip portion for a user to grip; a chain; a guide plate supporting the chain; a sprocket for driving the chain to move; the transmission assembly drives the chain wheel to rotate; a motor driving the transmission assembly; the method is characterized in that: the chain saw further includes a tensioning mechanism, the tensioning mechanism including: the guide plate adjusting disc is rotated to drive the guide plate to change in position, so that tensioning or loosening of the chain is realized; one of the guide plate adjusting disc and the guide plate comprises an eccentric pin, and the other one of the guide plate adjusting disc and the guide plate comprises a containing opening, and the eccentric pin is matched with the containing opening; the locking knob is used for locking the guide plate adjusting disc, and when the locking knob is screwed, the position of the guide plate is fixed. The tensioning mechanism of the chain saw is simple to operate, good in adjusting effect, not prone to failure, and not prone to loosening after the guide plate of the chain saw is locked.

Description

Chain saw

Technical Field

The present invention relates to a hand-held power tool, and more particularly to a chain saw.

Background

Chain saws, also known as pruners, are commonly used to prune branches or trees. The chain saw is usually driven by a motor, and the chain wheel is driven to rotate under the decelerating action of the transmission assembly, so that the chain wheel drives the chain to move along the guide plate, and the cutting operation is realized. In order to ensure that the chain works properly along the guide plate, a tensioning mechanism is usually provided on the chain saw to allow the chain to be tensioned when loosening occurs, so as not to affect the cutting function thereof. Some chain saws have their chains tensioned by an additional spanner attachment, and some chain saws are directly operated by the operator without the need for additional attachments.

Therefore, how to make the tensioning mechanism of the chain saw simple in structure, stable, reliable, convenient and easy to operate and good in fastening effect is a problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a chain saw, and the tensioning mechanism of the chain saw is simple to operate, is not easy to loosen and saves space.

In order to achieve the above object, the present invention adopts the following technical scheme: a chain saw, comprising: a housing forming an accommodating space, the housing including a grip portion for a user to grip; a chain; a guide plate supporting the chain; a sprocket for driving the chain to move; the transmission assembly drives the chain wheel to rotate; a motor driving the transmission assembly; the method is characterized in that: the chain saw further includes a tensioning mechanism, the tensioning mechanism including: the guide plate adjusting disc is rotated to drive the guide plate to change in position, so that tensioning or loosening of the chain is realized; one of the guide plate adjusting disc and the guide plate comprises an eccentric pin, and the other one of the guide plate adjusting disc and the guide plate comprises a containing opening, and the eccentric pin is matched with the containing opening; the locking knob is used for locking the guide plate adjusting disc, and when the locking knob is screwed, the position of the guide plate is fixed.

Further, the tensioning mechanism also includes an insert that is operated by the locking knob.

Further, the insert passes through the locking knob and the guide plate adjusting plate to be engaged with the engaging piece fixed in the housing.

Optionally, the locking knob comprises a base and a pull ring, the base and the insert are moved synchronously, and by operating the pull ring to rotate, the base is driven to rotate, and the insert is driven to rotate.

Alternatively, the tab may be in a pulled-up position for easy operator operation, or in a flat position, the tab being rotatable between the pulled-up position and the flat position.

Optionally, the housing comprises a left housing and a right housing, and the mating member is disposed within the left housing.

Optionally, the housing further comprises a housing cover, the guide plate and the chain being partially accommodated between the housing cover and the left housing.

Alternatively, the insert is a bolt comprising an external thread and the mating member is a screw tube comprising an internal thread.

Optionally, the baffle regulating plate is formed by cooperation of an operation rotary table and a regulating base, the operation rotary table and the regulating base rotate together, and the accommodating port is positioned on the regulating base.

Alternatively, the rotation direction of the guide plate adjusting disc and the locking knob are consistent when the chain is tensioned by adjusting the tensioning mechanism.

By providing the chain saw with the locking mechanism described above, the operator first adjusts the guide plate position through the guide plate adjustment plate and then fixes the guide plate position through the locking knob, thereby achieving tensioning or releasing of the chain. According to the chain saw disclosed by the invention, the locking mechanism enables an operator to adjust the position of the guide plate without touching the guide plate, the operation is simple, the adjusting effect is good, the guide plate is not easy to lose efficacy, and the guide plate is not easy to loosen after being locked through double compression of the guide plate adjusting disc and the locking knob.

Drawings

FIG. 1 is a schematic view of a chain saw;

FIG. 2 is an exploded view of a portion of the chain saw of FIG. 1 at a certain viewing angle;

FIG. 3 is a further exploded view of the chain saw of FIG. 1;

FIG. 4 is a schematic view of FIG. 3 at another perspective;

FIG. 5 is a top view of the chain saw of FIG. 1;

FIG. 6 is a cross-sectional view of the chain saw of FIG. 5 taken along the direction A-A;

FIG. 7 is a schematic perspective view of a locking knob of the chain saw tensioning mechanism;

FIG. 8 is a schematic view of the tab of FIG. 7 in a pulled-up position and a flat position;

FIG. 9 is an exploded view of the locking knob of FIG. 7 at a certain viewing angle;

FIG. 10 is a schematic view of the base of FIG. 9 from another perspective;

FIG. 11 is a schematic view of the guide plate adjustment plate of FIG. 2;

FIG. 12 is an exploded schematic view of one embodiment of the guide plate adjustment plate of FIG. 11;

FIG. 13 is a schematic view of the guide plate of FIG. 3;

FIG. 14 is a schematic view of the left housing of FIG. 3 at a certain viewing angle;

FIG. 15 is a schematic view of the left housing and mating element of FIG. 3 from another perspective;

fig. 16 is a cross-sectional view of the schematic in fig. 15.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and the described embodiments are only some embodiments of the present invention, but not all embodiments.

In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only, or to distinguish between different structures or components, and are not to be construed as indicating or implying relative importance.

Fig. 1 is a schematic view of a chain saw 10. The chain saw 10 includes a housing 300, the housing 300 being formed of a left housing 320 and a right housing 330, forming an accommodating space, the other side of the left housing 320 being connected to a housing cover 310. The housing 300 has a grip 301 for a user to grip, and a trigger 410 for controlling start and stop of the chain saw 10 is coupled to the housing 300. The cutting assembly 100 of the chainsaw 10 is composed of a guide plate 110, a chain 120 and a guard 130, the chain 120 being supported by the guide plate 110, the chain 120 moving along the guide plate 110 when the chainsaw 10 makes a cut, the chainsaw 10 further comprising a tensioning mechanism 200 to adjust the tightness of the chain 120. It will be appreciated that the chainsaw 10 may be powered by a battery pack or by an ac power source.

Fig. 2 to 4 are exploded views of the tensioning mechanism 200, and the tensioning mechanism 200 is adjusted to allow the chain 120 to operate normally when the chain 120 is not tightly attached to the guide plate 110, and when the chain 120 is loosened, or when the chain 120 needs to be replaced. From left to right, as shown in fig. 3, are the insert 210, the locking knob 220, the guide plate adjustment plate 250, the housing cover 310, the guide plate 110, the left housing 320, and the mating member 280, respectively. The guide plate 110 is located between the housing cover 310 and the left housing case 320, and in particular, the guide plate 110 is movable in a generally front-rear direction on the left housing case 320. When the guide plate 110 moves backward, i.e., toward the grip 301, the chain 110 is loosened, and an operator can adjust or replace the chain 110 as needed; as the guide plate 110 moves forward, the chain 110 is tensioned.

As shown in fig. 5, the chainsaw 10 further includes a motor 430 and a drive assembly 440 located within the receiving space of the housing 300. The energy provided by the battery pack or ac power source drives the motor 430 to rotate, and the output rotational speed of the motor 430 is reduced to a suitable rotational speed via the transmission assembly 440, thereby driving the cutting assembly 100 to move. Referring to FIG. 2, the drive assembly 440 drives the sprocket 140 to rotate, thereby driving the chain 120 along the guide plate 110 to perform the cutting function of the chainsaw 10.

Fig. 6 is a cross-sectional view of the chainsaw 10 of fig. 5 taken along the center A-A of the tensioning mechanism 200, in conjunction with fig. 3 and 6, the insert 210 is controlled by the locking knob 220 to engage the engagement member 280 secured within the left housing 320 after passing through the guide plate adjustment plate 250, the housing cover 310 and the guide plate 110. As one embodiment, the insert 210 includes a pin head 211 and a shaft 212 having external threads, the pin head 211 being seated within the locking knob 220, the shaft 212 being screwed or unscrewed within the fitting 280 by operation of the locking knob 220.

Fig. 7 to 10 show an embodiment of the locking knob 220, and an operator rotates the locking knob 220 to rotate the insert 210 inside thereof together by rotating the locking knob 220, so that the locking knob 220 is an operator controlling the rotation of the insert 210. As shown in fig. 7 and 8, the locking knob 220 is comprised of a base 230 and a pull ring 240, the pull ring 240 being rotatable along a first axis 201 on the base, the pull ring 240 being pulled up to a pulled up position substantially perpendicular to an upper surface of the base 230 when an operator desires to adjust the locking knob 200 of the chainsaw 10; when the operator does not need to adjust the locking knob 200, the pull ring 240 can be placed flat to a flat position substantially parallel to the upper surface of the base 230.

As shown in fig. 9 to 10, the pull ring 240 has two recesses 241 thereon for cooperating with the connection rods 231 on the base 230. The connecting rod 231 is located on the base 233 of the pedestal 230, and the connecting rod 231 extends substantially along the first axis 201. The pull ring 240 also has an arcuate opening 242, the arcuate opening 242 being used to place a finger when the operator rotates the locking knob 220 to facilitate the force applied during operation. When the tab 240 is in the flat position, the upper surface of the tab 240 is substantially flush with the upper surface of the collar 232 on the base 233. The base 230 also includes a bottom 235, and the bottom 235 extends into the guide plate adjustment plate 250 and is retained by the guide plate adjustment plate 250 to allow rotational movement of the locking knob 220. The base 233 of the base 230 has a first mating portion 234, and the first mating portion 234 mates with the plug 211 of the insert 210 such that when the locking knob 220 is rotated, the insert 210 rotates together. The base 230 further includes a first through hole 236 through which the shaft 212 of the insert 210 passes into the guide plate adjustment plate 250 via the first through hole 236 of the locking knob 220. It should be noted that in the present embodiment, the rotation of the locking knob 220 does not drive the rotation of the guide plate adjusting plate 250 together, and the guide plate adjusting plate 220 is driven to rotate by the operator.

As shown in fig. 11, the guide plate adjusting plate 250 has an operating edge 261 for an operator to rotate, and the operating edge 261 includes protrusions or patterns or the like for increasing friction to prevent slipping during operation. The surface of the guide plate adjustment plate 250 adjacent to the guide plate 110 is a first surface 271, and the first surface 271 has at least one eccentric pin 272, and the eccentric pin 272 is located on the surface of the locking knob 220 that contacts the guide plate 110.

As shown in fig. 12, in one embodiment, the guide plate adjusting plate 250 is composed of an operating dial 260 and an adjusting base 270, and the operating dial 260 has a limit protrusion 262 thereon, and the limit protrusion 262 is engaged with a limit recess 273 on the adjusting base 270, so that the rotation of the operating dial 260 drives the adjusting base 270 to rotate together. In other embodiments, the engagement between the operation dial 260 and the adjustment base 270 may be implemented in other forms, such as other mutually matched shapes, etc., and is not necessarily limited to the form that the semicircular limit protrusion 262 and the limit groove 273 are matched as shown in fig. 12, so long as the rotation of the operation dial 260 can be implemented to drive the adjustment base 270 to rotate together. It will be appreciated that the operating dial 260 and adjustment base 270 may also be integrally formed as one piece during the manufacturing process.

Fig. 13 shows an embodiment of the guide plate 110, in which the guide plate 110 includes a receiving opening 111 (see fig. 4) for receiving the eccentric pin 272 of the guide plate adjusting disk 250, and when the guide plate adjusting disk 250 rotates, the eccentric pin 272 rotates together with the guide plate adjusting disk 250 while the eccentric pin 272 is positioned in the receiving opening 111 of the guide plate 110, thereby driving the guide plate 110 to move in the front-rear direction. As shown in fig. 13, the receiving opening 111 may be a first opening slot 111a or a second through hole 111b, and the receiving opening 111 may completely penetrate the guide plate 110, or may penetrate only a portion of the guide plate 110 without penetrating, which does not affect the eccentric pin 272 of the guide plate adjusting plate 250 to be engaged with the guide plate 110 and drive the guide plate 110 to move in the front-rear direction. Only one receiving opening 111 is required on one guide plate 110 to perform its function, but it is not to say that one guide plate 110 can only have one receiving opening 111, and the orientation of the receiving opening 111 affects the adjustment direction of the operator when rotating the guide plate adjustment plate 250.

In the following, the guide plate 110 is described in detail by taking an example in which it includes only one receiving opening 111. A second straight line 101 extending substantially in the front-rear direction is defined on the guide plate 110, the second straight line 101 substantially dividing the second open groove 112 of the guide plate 110 symmetrically up and down, and the central axis of the insert 210 intersects the second straight line 101. To adjust the guide plate 110 to the forward position to tension the chain 120, the guide plate adjustment plate 250 is rotated counterclockwise when the receiving opening 111 is located above the second straight line 101 (as shown in fig. 13); when the receiving opening 111 is located below the second straight line 101, the guide plate regulating plate 250 is rotated clockwise.

In order to prevent the eccentric pins 272 from being broken to be disabled when one eccentric pin 272 is moved in cooperation with one receiving opening 111 with the movable guide plate 110, the eccentric pins 272 may be provided in plural, for example, in a vertically symmetrical arrangement. Meanwhile, the accommodating openings 111 on the guide plate 110 are correspondingly arranged to be the same as the eccentric pins 272 in number, so that the transmission is more stable and is not easy to fail.

As shown in fig. 14, the left housing 320 includes a third through hole 321 and a fourth through hole 322, the third through hole 321 allowing the transmission assembly 440 to pass therethrough, and the fourth through hole 322 allowing the fitting 280 to pass therethrough. The second open slot 112 of the guide plate 110 cooperates with the first protrusion 323 of the left housing 320, and the front edge (not shown) and the rear edge 324 of the first protrusion 323 of the left housing 320 define the extreme positions at which the guide plate 110 can move in the front-rear direction of the chain saw 10 when the tensioning mechanism 200 is adjusted.

Fig. 15 and 16 show the way in which the fitting 280 is fitted to the left casing 320, the fitting 280 is inserted into the left casing 320, and the fitting 280 cannot rotate in the left casing 320. In the present embodiment, the engaging member 280 includes a first limiting portion 281 and a second limiting portion 282. The first limiting portion 281 is engaged with the second engaging portion 322 of the left housing 320, and the second limiting portion 282 is engaged with the third engaging portion 325 of the left housing 320. Specifically, the second limiting portion 282 of the engaging member 280 is hexagonal, but in practical application, the second limiting portion 282 and the third engaging portion 325 are matched in shape, so that the engaging member 280 cannot rotate in the left casing 320. The mating element 280 includes an inner bore 283 extending therethrough, and the surface of the third bore 283 has internal threads 284, the internal threads 284 mating with external threads of the stem 212 of the insert 210.

It will be appreciated that the engaging member 280 may have different shape features from the present embodiment, such as including a different number or different shape of limiting portions, or other engaging means such as screwing by external threads, so long as the engaging member 280 does not rotate in the left housing 320. Meanwhile, as shown in the cross-sectional view of fig. 6, if the fitting 280 is non-rotatably disposed in the right housing 330, the same technical effect as that of disposing it in the right housing 330 can be achieved, and the effect is equivalent to that of the present embodiment, so that it is also within the scope of the present invention.

With the above arrangement, when the operator rotates the guide plate adjustment plate 250, the eccentric pin 272 drives the guide plate 110 to tension or loosen the chain 100. When the guide plate 110 is adjusted to the proper position, the insert 210 is driven to rotate together by rotating the locking knob 220, and when the locking knob 220 is screwed, the rod portion 212 of the insert 210 is screwed into the internal thread of the mating member 280, thereby locking the position of the guide plate 110. The operator tightens or loosens the chain 120 of the chain saw 10 by adjusting the guide plate 110 to a proper position by adjusting the guide plate adjusting plate 250 and then operating the locking knob 220 to fix the guide plate 110.

In this embodiment, as shown in fig. 3, the insert 211 is a bolt including external threads, and the mating member 280 is a screw tube including internal threads. In some other embodiments, the structures of the insert 211 and the mating member 280 may be interchanged, specifically, the insert 211 is configured as a threaded tube with internal threads, the mating member 280 is configured as a threaded rod with external threads, and the locking knob 220 is kept to rotate to drive the insert 211 to mate with the mating member 280 in the housing 300 for synchronous rotation, which still accords with the technical concept of the present invention and is within the scope of the present invention.

It should be understood that if the eccentric pin 272 is disposed on the guide plate 110 and the receiving opening 111 is disposed on the guide plate adjusting plate 250, it is still satisfied that the eccentric pin 272 is matched with the receiving opening 111, and the rotation of the guide plate adjusting plate 250 can still drive the guide plate 110 to move, so it is also within the scope of the present invention.

The beneficial effects of the invention are summarized as follows: first, the operator does not need to touch the guide plate 110 by hand, and the adjustment of the position of the guide plate 110 can be achieved by merely rotating the guide plate adjusting plate 250, and driving the guide plate 110 to move by the eccentric pin 272 on the guide plate adjusting plate 250. This "touchless" adjustment of the guide plate helps to avoid hazards and inconvenience that may be associated with an operator adjusting the guide plate position by "hand touch" when the guide plate 110 is hot or the surface is not sufficiently clean. Second, when the operator operates the tensioning mechanism 200 to tension the chain 120, the rotation direction of the locking knob 220 is consistent with the rotation direction of the guide plate adjusting plate 250, so that a "double tightening" effect is achieved, and the friction force applied to the guide plate 110 by the first surface 271 of the guide plate adjusting plate 250 is increased, so that the chain 120 is less prone to loosening. Third, the operator fixes or loosens the position of the guide plate 110 by rotating the pull ring 240 of the locking knob 220 to screw in or out the insert 210 in the fitting 280. When the tensioning mechanism 200 is needed, the pull ring 240 can be pulled up, and an operator does not need to match with additional tools such as a spanner, so that the user operation is greatly facilitated; when the tensioning mechanism 200 is not needed, the pull ring 240 can be flattened to save space.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims

1. A chain saw, comprising:

a housing forming an accommodation space, the housing including a grip portion for a user to grip;

a chain;

a guide plate supporting the chain;

a sprocket for driving the chain to move;

the transmission assembly drives the chain wheel to rotate;

a motor driving the transmission assembly;

the method is characterized in that:

the chain saw further includes a tensioning mechanism comprising:

the guide plate adjusting disc is rotated to drive the position of the guide plate to change, so that tensioning or loosening of the chain is realized; one of the guide plate adjusting disc and the guide plate comprises an eccentric pin, and the other one comprises a receiving opening, and the eccentric pin is matched with the receiving opening;

and the locking knob is used for locking the guide plate adjusting disc, and when the locking knob is screwed, the position of the guide plate is fixed.

2. The chain saw as set forth in claim 1, wherein:

the tensioning mechanism also includes an insert operated by the locking knob.

3. The chain saw as set forth in claim 2, wherein:

the insert passes through the locking knob and the guide plate adjusting disk and is matched with a matching piece fixed in the shell.

4. A chain saw according to claim 3, wherein:

the locking knob includes a base and a pull ring, the base moves synchronously with the insert, and the insert is driven to rotate by operating the pull ring to rotate.

5. The chain saw as set forth in claim 4, wherein:

the tab may be in a pull-up position for easy operator operation or in a landing position, the tab being rotatable between the pull-up position and the landing position.

6. A chain saw according to claim 3, wherein:

the casing includes left casing and right casing, the cooperation piece is set up in the left casing.

7. The chain saw as in claim 6, wherein:

the housing further includes a housing cover, and the guide plate and the chain are partially accommodated between the housing cover and the left housing.

8. A chain saw according to claim 3, wherein:

the insert is a bolt comprising an external thread and the mating member is a screw tube comprising an internal thread.

9. A chain saw according to claim 3, wherein:

the guide plate adjusting disc is formed by matching an operating turntable with an adjusting base, the operating turntable and the adjusting base rotate together, and the accommodating opening is positioned on the adjusting base.

10. The chain saw as set forth in claim 1, wherein:

when the chain is tensioned by adjusting the tensioning mechanism, the rotating directions of the guide plate adjusting disc and the locking knob are consistent.