阅读说明：本技术 链锯 (Chain saw ) 是由 李夏子 于 2019-10-18 设计创作，主要内容包括：本发明提供了一种链锯,包括壳体、安装在所述壳体上的驱动系统、自所述壳体向外延伸的导板、设置在所述导板上并可被所述驱动系统驱动的链条以及可张紧所述链条的张紧组件。所述导板设有受力部,所述张紧组件包括旋钮、与所述受力部相配合的张紧件以及同时与所述张紧件和所述旋钮固持配合的支架,所述旋钮与所述支架可脱扣配合,以在所述旋钮上施加驱动力时,驱动所述受力部并使所述导板移动而张紧所述链条,同时在所述链条张紧后,释放进一步施加在所述旋钮上的驱动力。相较于现有技术,本发明的链锯不仅可以实现链条的张紧,而且可以实现导板的紧固,从而方便使用者使用,且结构简单、可降低生产和使用成本。(The invention provides a chain saw, which comprises a shell, a driving system arranged on the shell, a guide plate extending outwards from the shell, a chain arranged on the guide plate and driven by the driving system, and a tensioning assembly capable of tensioning the chain. The baffle is equipped with atress portion, the tensioning subassembly include the knob, with atress portion complex tensioning piece and simultaneously with tensioning piece with knob retaining complex support, the knob with but the support dropout cooperation, in order when exerting drive power on the knob, the drive atress portion makes the baffle removes and the tensioning the chain is in simultaneously behind the chain tensioning, the release is further exerted drive power on the knob. Compared with the prior art, the chain saw not only can tension a chain, but also can fasten the guide plate, so that the chain saw is convenient for a user to use, has a simple structure, and can reduce the production and use cost.)

1. A chain saw comprising a housing, a drive system mounted on the housing, a guide plate extending outwardly from the housing, a chain disposed on the guide plate and drivable by the drive system, and a tensioning assembly operable to tension the chain, wherein: the baffle is equipped with atress portion, the tensioning subassembly include the knob, with atress portion complex tensioning piece and simultaneously with tensioning piece with knob retaining complex support, the knob with but the support dropout cooperation, in order when exerting drive power on the knob, the drive atress portion makes the baffle removes and the tensioning the chain is in simultaneously behind the chain tensioning, the release is further exerted drive power on the knob.

2. The chain saw as recited in claim 1, wherein: the tensioning assembly further includes a spring mounted to the bracket for providing a spring force when the knob is releasably engaged with the bracket.

3. The chain saw as recited in claim 2, wherein: the center position department of support is provided with the reference column, the elastic component cover is established on the reference column.

4. The chain saw as recited in claim 3, wherein: the tensioning assembly further comprises an adjusting part movably connected with the positioning column, and the elastic part is arranged between the support and the adjusting part so as to adjust the elastic compression degree of the elastic part by adjusting the adjusting part.

5. The chain saw as recited in claim 1, wherein: the support is equipped with the orientation the convex column that the tensioning piece extends, set up on the tensioning piece with the corresponding perforation of convex column, so that the tensioning piece with convex column fixed connection.

6. The chain saw as recited in claim 1, wherein: the top inside wall of the knob is provided with a first end tooth, the support is provided with a second end tooth which is meshed with the first end tooth in a tripping manner, and the second end tooth is correspondingly arranged on the top outside wall of the support.

7. The chain saw as recited in claim 1, wherein: the interior perisporium of knob is equipped with protruding muscle, be equipped with on the periphery wall of support with protruding muscle assorted draw-in groove, and when the knob with support intermeshing, protruding muscle is spacing accept in the draw-in groove.

8. The chain saw as recited in claim 7, wherein: the convex rib is provided with two first side walls which extend along the axis direction of the knob and are oppositely arranged, the two first side walls are inclined walls, and the included angle between the two first side walls and the inner peripheral wall of the knob is larger than 90 degrees; the draw-in groove is by locating suddenly two fin on the support periphery wall are injectd and are formed, two fin are equipped with the edge two second lateral walls that extend and relative setting of the axis direction of support, two second lateral walls be the hang plate and with the contained angle of the periphery wall of support is greater than 90 degrees.

9. The chain saw as recited in claim 8, wherein: when the knob rotates, the bracket and the knob synchronously rotate and drive the tensioning piece to synchronously rotate so as to push the guide plate to advance to tension the chain; the knob continues to rotate and when the tripping force between knob and the support is greater than the meshing force between the two, the tensioning piece with the support no longer rotates, the first lateral wall of protruding muscle with the second lateral wall of fin slides relatively, so that the protruding muscle breaks away from the draw-in groove.

10. The chain saw as recited in claim 1, wherein: the central point of knob puts the department and is equipped with the round pin post, the bottom end of round pin post is equipped with the ring channel, support and tensioning piece are all established on the round pin post, the tensioning subassembly is still established including the card retaining ring in the ring channel, with will knob, support and tensioning piece make up into an organic whole.

Technical Field

The invention relates to a chain saw, in particular to a chain tensioning structure of the chain saw.

Background

A chain saw is a gardening tool that cuts wood or branches using high-speed rotation of a chain with blades. If the chain of the chain saw is not properly tensioned, it may disengage from the guide plate and cause injury to the operator; if the chain is too tight, high temperature failure may result from excessive friction between the chain and the guide plate. During use, the chain tension changes considerably due to wear and tear, and over time the chain length increases and the tension decreases.

At present, the existing chain tensioning methods are roughly divided into two categories, one category is that one or more special tools are needed to directly or indirectly rotate an adjusting screw rod and fasten a clamping nut, but the structure needs a user to carry the adjusting tool with him, and the use is inconvenient; another type of adjustment mechanism is provided by adjusting a handle or knob that can be rotated by hand, without the aid of tools, to respectively tension the chain and secure the shoe, but such handles or knobs usually require the provision of an outer knob and an inner knob, the tensioning chain being stepped: the first step is chain tensioning, and the second step is guide plate compaction, so step operation not only brought the inconvenience of assembly for the user, but also the structure is more complicated.

In view of the above, there is a need for an improved chain tensioning structure to solve the above problems.

Disclosure of Invention

The invention aims to provide a chain saw which can realize tensioning of a chain and fastening of a guide plate, is convenient for a user to use, has a simple structure and can reduce production and use costs.

In order to achieve the above object, the present invention provides a chain saw comprising a housing, a driving system mounted on the housing, a guide plate extending outwardly from the housing, a chain arranged on the guide plate and drivable by the driving system, and a tensioning assembly capable of tensioning the chain, the guide plate being provided with a force receiving portion, the tensioning assembly comprising a knob, a tensioning member cooperating with the force receiving portion, and a bracket fixedly cooperating with both the tensioning member and the knob, the knob being in releasable engagement with the bracket to drive the force receiving portion and move the guide plate to tension the chain when a driving force is applied to the knob, and to release the driving force further applied to the knob after the chain is tensioned.

As a further improvement of the present invention, the tension assembly further comprises a spring mounted on the bracket for providing a spring force when the knob is releasably engaged with the bracket.

As a further improvement of the invention, a positioning column is arranged at the central position of the bracket, and the elastic piece is sleeved on the positioning column.

As a further improvement of the present invention, the tensioning assembly further includes an adjusting member movably connected to the positioning column, and the elastic member is disposed between the bracket and the adjusting member, so as to adjust the degree of elastic compression of the elastic member by adjusting the adjusting member.

As a further improvement of the present invention, the bracket is provided with a convex pillar extending toward the tensioning member, and the tensioning member is provided with a through hole corresponding to the convex pillar, so that the tensioning member is fixedly connected with the convex pillar.

As a further improvement of the invention, a first end tooth is arranged on the inner side wall of the top of the knob, a second end tooth which can be in tripping engagement with the first end tooth is arranged on the bracket, and the second end tooth is correspondingly arranged on the outer side wall of the top of the bracket.

As a further improvement of the invention, the inner peripheral wall of the knob is provided with a convex rib, the outer peripheral wall of the bracket is provided with a clamping groove matched with the convex rib, and the convex rib is limited and contained in the clamping groove when the knob is meshed with the bracket.

As a further improvement of the invention, the convex rib is provided with two first side walls which extend along the axial direction of the knob and are oppositely arranged, and the two first side walls are both inclined walls and have an included angle larger than 90 degrees with the inner peripheral wall of the knob; the draw-in groove is by locating suddenly two fin on the support periphery wall are injectd and are formed, two fin are equipped with the edge two second lateral walls that extend and relative setting of the axis direction of support, two second lateral walls be the hang plate and with the contained angle of the periphery wall of support is greater than 90 degrees.

As a further improvement of the present invention, when the knob rotates, the bracket and the knob rotate synchronously and drive the tensioning member to rotate synchronously, so as to push the guide plate to advance and tension the chain; the knob continues to rotate and when the tripping force between knob and the support is greater than the meshing force between the two, the tensioning piece with the support no longer rotates, the first lateral wall of protruding muscle with the second lateral wall of fin slides relatively, so that the protruding muscle breaks away from the draw-in groove.

As a further improvement of the invention, a pin column is arranged at the central position of the knob, an annular groove is arranged at the tail end of the bottom of the pin column, the support and the tensioning piece are sleeved on the pin column, and the tensioning assembly further comprises a check ring clamped in the annular groove so as to combine the knob, the support and the tensioning piece into a whole.

The invention has the beneficial effects that: the chain saw of the invention is provided with the knob and the bracket in a tripping matching way, so that when a driving force is exerted on the knob, the force-bearing part can be driven by the bracket and the tensioning piece, and the guide plate moves to tension the chain; meanwhile, after the chain is tensioned, the driving force further exerted on the knob can be released, the guide plate is fastened, the use by a user is facilitated, the structure is simple, and the production and use cost can be reduced.

Drawings

FIG. 1 is a perspective view of the chain saw of the present invention.

FIG. 2 is a perspective view of the chain saw shown in FIG. 1 with a portion of the housing removed.

FIG. 3 is a perspective view of the chainsaw shown in FIG. 2 with the tension assembly removed.

FIG. 4 is an exploded view of the tensioning assembly of the chain saw of FIG. 1.

Fig. 5 is a bottom view of the knob of fig. 4.

Fig. 6 is a bottom view of the bracket of fig. 4.

Fig. 7 is a bottom view of the first embodiment of the tension member of fig. 4.

Figure 8 is a cross-sectional view of the tension assembly shown in figure 4.

Fig. 9 is a bottom view of the second embodiment of the tension member of fig. 4.

Fig. 10 is a bottom view of a third embodiment of the tension member of fig. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 and 2, the present invention discloses a chainsaw 100 including a housing 2, a driving system 1 mounted on the housing 2, a guide plate 6 extending outward from the housing 2, a chain 7 disposed on the guide plate 6 and driven by the driving system 1 to reciprocate, and a tension assembly 8 for tensioning the chain 7. In this embodiment, the chainsaw 100 further includes a rear handle 3, a front handle 4, a fender 5, a power supply unit 9, a trigger 10, and a brake system (not shown) mounted on the housing 2. Since the housing 2, the rear handle 3, the front handle 4, the chain 7, the power supply unit 9 and the trigger 10 belong to the prior art, detailed descriptions of the specific structures of the housing 2, the rear handle 3, the front handle 4, the chain 7, the power supply unit 9 and the trigger 10 are omitted.

The fender 5 is mounted on the housing 2 and is rotatable relative to the housing 2, and upon rotation of the fender 5, a braking system of the chainsaw 100 is activated. The braking system may be a mechanical braking structure, an electronic braking system, or a combined mechanical and electronic braking system, which is not limited herein.

The power supply unit 9 is used for inserting a battery pack to supply power to the chain saw 100; of course, in other embodiments, the chain saw 100 can be operated by an external power source, an internal combustion engine, or other suitable energy source, and is not limited thereto.

The trigger 10 is provided on the rear handle 3 for starting and closing the chainsaw 100.

As shown in fig. 2 and 3, the guide plate 6 is provided with a force receiving portion 60, and the force receiving portion 60 is an end of the guide plate 6 close to the driving system 1, so that when the tensioning assembly 8 operates, the entire guide plate 6 can be driven by the force receiving portion 60 to move, and then the tensioning of the chain 7 is achieved. Specifically, the force receiving portion 60 is provided with a guide groove 61, and the guide plate 6 is longitudinally movable along the guide groove 61 by the tension assembly 8, thereby performing tension and release of the chain 7.

And a positioning sheet 62 is fixedly arranged on the guide plate 6, one side surface of the positioning sheet 62 is attached to the stress part 60, and the other side surface of the positioning sheet 62 is contacted with the tensioning assembly 8. The positioning plate 62 is provided at a surface thereof contacting the tension assembly 8 with a plurality of protrusions 63, and the plurality of protrusions 63 are uniformly distributed along the longitudinal direction of the guide groove 61 for cooperating with the tension assembly 8 to drive the guide plate 6 to tension or loosen the chain 7.

The housing 2 is further provided with a bolt 64, and the bolt 64 penetrates through the guide groove 61 and the positioning piece 62 of the guide plate 6 to be assembled and fixed with the tensioning assembly 8, so that the guide plate 6 is fixedly connected with the tensioning assembly 8. At the same time, the tensioning assembly 8 is also moved synchronously in the direction of approaching the housing 2 when tensioning the chain 7, i.e. is locked in place by the screw 64, so that a synchronous clamping of the guide plate 6 is achieved.

As shown in fig. 4 to 6, the tensioning assembly 8 includes a knob 81, a tensioning member 87 cooperating with the force receiving portion 60, and a bracket 82 fixedly cooperating with both the tensioning member 87 and the knob 81. The knob 81 and the bracket 82 are in a releasable fit, so that when a user applies a driving force to the knob 81, the force receiving portion 60 is driven by the mutual fit of the knob 81 and the bracket 82, and the guide plate 6 is moved to tension the chain 7; at the same time, the driving force further applied to the knob 81 can be released after the chain 7 is tensioned.

The top inner side wall of the knob 81 is provided with a first end tooth 811, the bracket 82 is provided with a second end tooth 821 which is in releasable engagement with the first end tooth 811, the second end tooth 821 is correspondingly arranged on the top outer side wall of the bracket 82, and after the knob 81 and the bracket 82 are assembled, the first end tooth 811 is tightly engaged with the second end tooth 821 so as to drive the bracket 82 to synchronously rotate when the knob 81 is rotated.

A pin 812 extending downwards is arranged at the center of the knob 81, the outer surface of the pin 812 is a smooth surface, a receiving hole 8121 is formed in the bottom of the pin 812, and an internal thread is formed in the receiving hole 8121 so as to be in threaded connection with the bolt 64. The bottom end of the pin 812 is provided with an annular groove 814, and the annular groove 814 is formed by recessing the outer surface of the pin 812 inward. A positioning column 825 matched with the pin 812 is arranged at the central position of the bracket 82, a through hole 8251 is formed in the positioning column 825, and the pin 812 penetrates through the through hole 8251 so as to realize the fixed connection between the knob 81 and the bracket 82.

The inner peripheral wall 810 of the knob 81 is provided with a convex rib 813, the convex rib 813 is provided with two first side walls 8131 which extend along the axial direction of the knob 81 (i.e. the extending direction of the pin 812) and are oppositely arranged, and the two first side walls 8131 are both inclined walls and have an included angle greater than 90 degrees with the inner peripheral wall 810 of the knob 81. The outer peripheral wall 820 of the bracket 82 is provided with a clamping groove 822 matched with the convex rib 813, and when the knob 81 is meshed with the bracket 82, the convex rib 813 is limited and contained in the clamping groove 822. The locking groove 822 is defined by two protruding ribs 823 protruding from the outer circumferential wall 820 of the bracket 82, the two protruding ribs 823 are also provided with two second side walls 8230 extending along the axial direction of the bracket 82 (i.e. the extending direction of the positioning column 825) and oppositely disposed, and the two second side walls 8230 are also inclined walls and have an included angle greater than 90 degrees with the outer circumferential wall 820 of the bracket 82. That is, the two second side walls 8230 of the rib 823 are respectively matched with the two first side walls 8131 of the rib 813.

In this embodiment, the number of the ribs 813 is preferably six, and the number of the locking grooves 822 is also preferably six.

The bracket 82 is further provided with at least one downwardly extending convex column 824, and the bottom end of the convex column 824 is provided with an internal threaded hole (not numbered). In this embodiment, the number of the protruding columns 824 is preferably four, and the protruding columns are uniformly distributed around the positioning columns 825, but not limited thereto.

The tension assembly 8 further includes an elastic member 83 and an adjustment member 85. The elastic member 83 is mounted on the bracket 82 for providing an elastic force when the knob 81 is releasably engaged with the bracket 82. The adjusting member 85 is movably connected to the positioning post 825. Specifically, the elastic member 83 is sleeved on the positioning column 825 and located between the bracket 82 and the adjusting member 85, so that the elastic compression degree of the elastic member 83 can be adjusted by adjusting the adjusting member 85, and further, after the elastic member 83 is fatigued in long-term use, the effective compression force of the elastic member 83 can be effectively adjusted, so that the releasable fit between the knob 81 and the bracket 82 is kept in an optimal state. In this embodiment, the elastic member 83 is a compression spring, and the force applied to the bracket 82 by the compression spring is adjustable, preferably 20N.

The adjusting member 85 and the positioning post 825 can be connected by a threaded connection manner, so as to adjust the elastic compression degree of the elastic member 83; of course, the connection and the fitting can be performed by other suitable methods, which are not limited herein.

The tension assembly 8 further includes a retainer ring 86 captured within an annular groove 814 of the pin 812. The pin 812 sequentially passes through the bracket 82, the elastic member 83, the tensioning member 87, the adjusting member 85 and the retainer ring 86 from top to bottom, and combines the knob 81, the bracket 82, the elastic member 83, the tensioning member 87 and the adjusting member 85 into a whole by means of the mutual matching of the retainer ring 86 and the annular groove 814. Specifically, the pin 812 sequentially passes through the through hole 8251 of the positioning post 825, the tensioning member 87, the adjusting member 85 and the retaining ring 86, and is rotatably engaged with the bolt 64, so as to finally realize the assembling and fixing of the tensioning assembly 8 and the guide plate 6.

As shown in fig. 7 and 8 in combination with fig. 4, the protruding pillar 824 extends toward the tensioning member 87, and a through hole 873 corresponding to the protruding pillar 824 is formed on the tensioning member 87, so that the tensioning member 87 is fixedly connected to the protruding pillar 824. Specifically, in this embodiment, the tensioning member 87 is a rotary disc, the rotary disc 87 includes a spiral guide 871 disposed on a lower end surface thereof and a middle hole 872 located at a central position thereof, the middle hole 872 is used for the positioning column 825 to pass through, and the through hole 873 is located on an outer periphery of the middle hole 872 and an inner periphery of the spiral guide 871, so that the countersunk head screw 84 can pass through the through hole 873 on the rotary disc 87 and be screwed with the internal thread hole at the bottom end of the convex column 824, thereby achieving the fixed connection of the rotary disc 87 and the bracket 82. The number of the countersunk head screws 84 and the through holes 873 is preferably four.

The distance between two adjacent protrusions 63 on the positioning plate 62 is greater than or equal to the width of the spiral guide 871, so that when the chain 7 needs to be tensioned, the guide plate 6 can be driven to move by the relative movement of the protrusions 63 along the spiral guide 871, and then the tensioning of the chain 7 is realized. In this embodiment, the helical guide 871 is provided with at least one, preferably two, because: after the tensioning assembly 8 is assembled, the tensioning degree of the chain 7 is calculated according to a spiral line equation, the eccentricity of a 180-degree single spiral line is 2-10 mm, and the spiral guide rails 871 of double spiral lines can effectively find meshing points.

As shown in fig. 9, a bottom view of the second embodiment of the tensioning member 87 of fig. 4 is shown. In this embodiment, the tensioning member 87 'is a one-way cam, and the one-way cam 87' can be used to cooperate with the force-receiving portion 60 instead of the rotating disc 87 in the first embodiment to drive the guide plate 6 to move, so as to tension the chain 7. Of course, the structure other than the tensioning member 87' is the same and will not be described in detail.

As shown in fig. 10, a bottom view of the third embodiment of the tensioning member 87 of fig. 4 is shown. In this embodiment, the tensioning member 87 "is a bidirectional cam, and the bidirectional cam 87" can be used to cooperate with the force receiving portion 60 instead of the rotating disc 87 in the first embodiment to drive the guide plate 6 to move so as to tension the chain 7. Of course, the structure other than the tensioning member 87 "is the same and will not be described in detail.

Of course, in other embodiments, the tensioning member 87 may be any other suitable structure capable of cooperating with the force-receiving portion 60 to drive the guide plate 6 to move, and is not limited herein.

It should be noted that: when the one-way cam 87 'or the two-way cam 87 "is used instead of the rotating disk 87 as the eccentric rotating mechanism, the one-way cam 87' or the two-way cam 87" is installed in the same manner as the rotating disk 87, except that one protrusion 63 is provided on the positioning piece 62.

Taking the tensioning member 87 as an example of a rotary disc, after the tensioning assembly 8 is assembled, the bolt 64 sequentially passes through the guide slot 61 and the positioning plate 62, and is engaged and locked with the internal thread of the pin 812. At this time, the elastic member 83 is compressed to a certain degree, the second end teeth 821 of the bracket 82 and the first end teeth 811 of the knob 81 are engaged with each other, and the ribs 813 are limited and received in the corresponding slots 822. Due to the mutual engagement between the second end tooth 821 and the first end tooth 811 and the limit effect of the locking groove 822 on the rib 813, when the knob 81 is rotated by applying the driving force, the bracket 82 and the knob 81 are driven to rotate synchronously, and the rotation directions of the bracket 82 and the knob 81 are consistent. Then, the bracket 82 drives the turntable 87 to rotate synchronously, and the guide plate 6 is pushed to advance under the matching action of the spiral guide 871 of the turntable 87 and the protrusion 63 on the positioning sheet 62, and the chain 7 is tensioned.

When the chain 7 is tensioned, if the knob 81 is rotated continuously, the rotating disc 87 does not rotate any more, the bracket 82 does not rotate any more, and when the tripping force between the first end tooth 811 and the second end tooth 821 is larger than the meshing force between the first end tooth 811 and the second end tooth 821, the first end tooth 811 and the second end tooth 821 are tripped; meanwhile, the first side wall 8131 of the rib 813 slides relative to the second side wall 8230 of the rib 823, so that the rib 813 is separated from the slot 822, and a click-off sound is generated. At this time, the rotation of the knob 81 causes the pin 812 and the bolt 64 to rotate relatively, which in turn fastens the guide plate 6 to the housing 2 of the chainsaw 100, and thus fastens the guide plate 6.

As described above, the chainsaw 100 of the present invention is configured such that the knob 81 and the bracket 82 are arranged to be releasably engaged, so that when a driving force is applied to the knob 81, the force receiving portion 60 of the guide plate 6 is driven by the bracket 82 and the tensioning member 87, so that the guide plate 6 is moved to tension the chain 7; at the same time, after the chain 7 is tensioned, the driving force further exerted on the knob 81 can be released, achieving the fastening of the guide plate 6. Compared with the prior art, the chain saw 100 provided by the invention not only can tension the chain 7, but also can fasten the guide plate 6, is convenient for a user to use, has a simple structure, and can reduce the production and use cost.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.