CN104412840A

CN104412840A - Chain saw

Info

Publication number: CN104412840A
Application number: CN201310399963.9A
Authority: CN
Inventors: 高振东
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2013-09-05
Filing date: 2013-09-05
Publication date: 2015-03-18

Abstract

The invention provides a chain saw, which comprises a flexible cutting element, a support board, a power driven device, a main machine shell, a handle device and a protective mechanism. The support board is used to support the flexible cutting element. The power driven device is used to drive the flexible cutting element to move circulatory around the support board. The main machine shell is used to contain the power driven device. The handle device is connected with the main machine shell. The protective mechanism is arranged above work components. Because the protective mechanism is at least partially made of metal, the protective mechanism is safe and solid. Even negative kicking of the chain saw occurred in cutting process, safety of the operator is ensured effectively.

Description

Chain saw

Technical Field

The invention relates to a power tool, in particular to a chain saw.

Background

Currently, a variety of tools for plant pruning are available on the market, such as scissors for pruning some relatively small branches and leaves. Also pruners and chain saws are commonly used to trim relatively thick trees and the like.

The traditional chain saw comprises a working head consisting of a saw chain and a supporting plate for supporting the saw chain, wherein the chain is driven by a motor to circularly rotate around the supporting plate; such chainsaws also include a main handle located at the rear of the working head and an auxiliary handle located between the working head and the main handle. A baffle plate is usually arranged in front of the auxiliary handle and behind the support plate of the chain saw to prevent the chain saw from kicking or jumping due to the fact that the chain saw touches a large load in the cutting process, and the baffle plate can move correspondingly under the action of kicking of the chain saw, so that the chain saw can realize automatic braking; in addition, a brake mechanism is usually provided on the chain saw, which can be manually controlled to brake when an operator is aware of an unsafe condition to be generated during cutting, so that the saw chain can be immediately stopped to prevent the saw chain from being injured, thereby keeping the safety of the operator.

Such an automatically and/or manually controlled brake mechanism is called a kickback safety mechanism, and the chainsaw is provided with such an automatically and/or manually controlled brake mechanism to ensure the safety of the operator in case of kickback during the actual cutting process. However, the connection relationship between the components of the kickback prevention mechanism is very complicated, the manufacturing precision requirement is high, not only the design and manufacturing cost of the chain saw is increased, but also the weight of the chain saw is increased due to the numerous components, which is not beneficial for an operator to perform cutting work.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a chain saw which cancels the traditional anti-kicking safety mechanism and can provide good protection for the safety of operators through safety regulation.

In order to solve the above problems, the present invention provides a chain saw including: a working assembly having a cutting element and a support plate supporting the cutting element; the power driving device is used for driving the cutting element to move around the supporting plate; a main machine housing accommodating the power driving device; a handle device connected to the main machine housing; a guard mechanism located on the working assembly; the guard mechanism is at least partially made of metal.

Preferably, the guard mechanism is pivotally arranged relative to the main housing.

Preferably, a plurality of observation windows are arranged on the protection mechanism.

Preferably, the protection mechanism comprises a top wall and a plurality of side walls extending from the top wall, the top wall and the plurality of side walls enclose a protection space which can completely receive the working assembly, and the protection space is provided with an opening which faces downwards.

Preferably, the top wall of the guard mechanism is made of metal.

Preferably, the top wall of the guard mechanism is made of steel plate.

Preferably, the top wall and the side wall of the guard mechanism are detachably connected.

Preferably, the top wall and the side wall of the guard mechanism are connected together by threaded fasteners.

Preferably, the top wall and the side wall of the guard mechanism are non-detachably connected.

Preferably, the top wall and the side wall of the guard mechanism are bonded together by an adhesive.

Preferably, the top wall and the side wall of the protection mechanism are combined together through an in-mold injection molding processing technology.

Preferably, the protection mechanism comprises an inner layer close to the working assembly and an outer layer far away from the working assembly, and the inner layer is of a metal framework structure.

Preferably, the outer layer of the protection mechanism is made of a shock absorption and buffering material.

Preferably, the damping and buffering material used for the outer layer of the protection mechanism is foam plastic or rubber.

Preferably, the inner and outer layers of the protective mechanism are bonded together by an adhesive.

Preferably, the inner layer and the outer layer of the protection mechanism are combined together through an in-mold injection molding processing technology.

Preferably, the inner metal framework of the protection mechanism comprises a plurality of U-shaped metal strips distributed at intervals.

Preferably, the inner metal framework of the protection mechanism is made of a steel plate with the thickness of 0.5-1.8 mm.

Preferably, the guard mechanism is made entirely of metal.

Preferably, the protection mechanism is made of aluminum alloy with the thickness of 2-5 mm.

Preferably, the protection mechanism is made of a steel plate with the thickness of 1-2 mm.

Preferably, the end of the guard mechanism remote from the main housing is made of metal.

Preferably, the end part of the protection mechanism far away from the main machine shell is made of aluminum alloy with the thickness of 2-5mm or steel plate with the thickness of 1-2 mm.

Preferably, the end of the top wall of the guard mechanism remote from the main housing is made of metal.

Preferably, the end of the top wall of the guard mechanism remote from the main housing is made of steel plate.

Due to the adoption of the technical scheme, the chain saw reduces the manufacturing cost, and greatly reduces the weight of the whole chain saw, so that a user has better operation experience. In addition, in the actual cutting process, the splashing of chips and sawdust can be effectively prevented, and an operator is protected. More importantly, the protection mechanism is made of metal completely or the top of the protection mechanism is made of metal or the metal framework of the protection mechanism is constructed, so that the hardness and the firmness of the protection mechanism can be greatly improved, and even if the operator kicks reversely during the cutting operation of the chain saw, the operator can be protected by the protection mechanism to avoid serious injury.

Drawings

The present invention is described in further detail below with reference to the attached drawings.

Fig. 1 is a schematic perspective view of a chain saw according to a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the chain saw disclosed in fig. 1.

Fig. 3 is a schematic view of the operation of the chain saw disclosed in fig. 1.

Fig. 4 is a perspective view of a guard mechanism of a chain saw according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of the guard mechanism of the chain saw disclosed in FIG. 4.

Fig. 6 is a front view of a guard mechanism of a chain saw according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of the guard mechanism of the chain saw disclosed in FIG. 6 taken along the A-A direction.

Fig. 8 is a perspective view of a guard mechanism of a chainsaw according to a fourth embodiment of the present invention.

Wherein,

Detailed Description

Referring to fig. 1 and 2, the chainsaw 10 includes a main frame housing 2, and a handle device is provided on the main frame housing 2. The working unit 12 extends to the outside of the main housing 2 along the longitudinal direction of the main housing 2, and when the work W is cut, the working unit 12 is located in front of the main housing 2. The handle device comprises a main handle 4 which is positioned at the rear part of the main machine shell 2 and extends along the longitudinal direction of the main machine shell 2, and an auxiliary handle 5 which is positioned in front of the main handle 4 and at one side of the main machine shell 2, and an operator can simultaneously hold the main handle 4 and the auxiliary handle 5 to execute double-hand operation in the cutting process.

The chainsaw 10 includes a working assembly 12 for machining a workpiece W, the working assembly 12 including a support plate 14 and a cutting element mounted on the support plate 14. In the present embodiment, the cutting element is a flexible chain 16, and the flexible chain 16 is mounted on the periphery of the supporting plate 14 and can rotate around the supporting plate 14. The main body casing 2 in this embodiment includes two half-shells 2a, and a cover 2b connected to one of the half-shells 2 a. Of course, the main body housing 2 is not limited to the above-described structure, and those skilled in the art can make appropriate changes. The main body casing 2 is provided with a driving device, the present embodiment adopts an electric motor 18, and the main body casing 2 is provided with a power supply line 8 for supplying power to the motor 18. Of course, the present invention may also provide dc power to the electric motor 18 via a battery pack. The high speed rotation of the motor 18 is transmitted through the transmission 17 to the sprocket 19, and the flexible chain 16 is driven by the sprocket 19. The supporting plate 14 is relatively fixedly supported in the main machine casing 2, and the flexible chain 16 is circularly moved around the supporting plate 14 at a high speed. Of course, the driving device of the present invention is not limited to the electric motor 18, and may be replaced with fuel, a steam engine, or the like.

The chainsaw further includes a guard mechanism 20 disposed above the working assembly 12, and in the inoperative state, the working assembly 12 is effectively completely covered by the guard mechanism 20, i.e., the guard mechanism 20 completely houses the cutting element 12 therein. The shielding mechanism 20 in the present embodiment is made of metal, specifically, an aluminum alloy with a thickness of 2-5mm or a steel plate with a thickness of 1-2mm may be used, and the specific metals that may be used are not limited to the above two. The protective mechanism 20 is provided with a plurality of observation windows 28, which is convenient for observing the condition of the working assembly 12 during operation, the protective mechanism 20 can effectively prevent fragments generated during cutting the workpiece from splashing, and the protective mechanism is made of metal completely, so that the protective mechanism is safe and firm even if kicking occurs in the cutting process. The safety of the operator is also effectively protected and is therefore also referred to as a safety shield. The main body casing 2 is provided with a lock release device 30 for locking the inoperative position of the guard mechanism 20.

Referring to fig. 2, one end of the protection mechanism 20 is a connection end, and is pivotally connected to the main housing 2 through a rotation shaft 26, and the other end far away from the connection end protrudes in front of the working module 12 and is a free end; one of the shafts 26 is disposed on the casing 2b of the main housing 2, and the other shaft 26 is disposed on the other half-half 2a (not shown) opposite to the casing 2 b. The shielding mechanism 20 includes a top wall 24, a plurality of side walls extending downwardly from the top wall 24. Wherein the side walls include a pair of parallel side walls 22 (only one shown) extending downwardly from a top wall 24, and a front side wall 21 located in front of the cutting assembly 12 and connecting the two parallel side walls 22. The top wall 24, the parallel side walls 22 and the front side wall 21 together enclose a shielded space for receiving the working assembly 12, and the lower side of the shielded space forms an opening (not shown) opposite to the top wall 24; the plane in which the opening is located is below the working assembly 12 when the guard mechanism 20 is in the inoperative condition. The top wall 24 and the side wall 22 are provided with a plurality of viewing windows 28 arranged in parallel, respectively. The side walls 22 are provided with round holes 25 at positions close to the connecting ends, and the rotating shaft 26 is matched and connected with the round holes 25.

At least one locking and releasing device 30 is arranged on the main machine shell 2 and used for locking the non-working position of the protection mechanism 20; when the guard mechanism 20 is in the locked state, the cutting element 12 is fully received within the guard space of the guard mechanism 20 and the cutting element 12 is restricted from being exposed from the guard mechanism 20 to be accessed. The lock releasing device 30 includes an elastic member 31 located between the half-shell 2a and the casing 2b, a bracket 32 abutting against the elastic member 31, and a locking member 33 extending from the bracket 32 to the outside of the main housing 2, wherein the casing 2b is provided with an opening 27 through which the locking member 33 passes out of the casing 2 b. Under normal conditions, the bracket 32 is biased towards the direction of the casing 2b by the elastic element 31, at this time, the locking element 33 protrudes out of the outer surface of the casing 2b, and the locking element 33 is located at a position just matching with the parallel side wall 22 of the connecting end of the protection mechanism 20 for stopping, so that the protection mechanism 20 can be effectively prevented from overturning relative to the main machine casing 2, that is, the position of the protection mechanism 20 is effectively locked; and a lock member 33 protruding outside the housing 2b can be easily controlled by an operator to release the lock of the lock releasing device 30 (refer to fig. 1).

A biasing mechanism is disposed between the guard mechanism 20 and the main housing 2, and the biasing mechanism biases the guard mechanism 20 to the non-operating position, so that the guard mechanism 20 can automatically return to the safety state after the chain saw 10 completes the cutting operation, i.e., the working assembly 12 is completely accommodated in the guard space of the guard mechanism 20. The biasing mechanism in this embodiment is a torsion spring 35, one end of the torsion spring 35 is connected to the rotating shaft 26, and the other end is connected to the inner wall of the parallel side wall 33, so that the protection mechanism 20 always maintains the elastic biasing force toward the cutting assembly 12 during and after the cutting of the workpiece W. To allow the guard mechanism 20 to pivot flexibly relative to the main housing 2 during cutting, the parallel side walls 22 are provided with guide slots (not shown) on their inner walls to allow the abutment portions of the latches 33 to slidably engage therein when the guard mechanism 20 is rotated. When the working assembly 12 leaves the workpiece W after completing the cutting, the protection mechanism 20 automatically returns to the initial state, i.e., the non-working state, under the action of the biasing mechanism; the abutment of the blocking element 33 slides out of the guide slot and under the action of the spring element 31 passes through the opening 27 and engages with one of the parallel side walls 22 of the guard mechanism 20 to block this inoperative position of the guard mechanism 30 automatically.

Referring to fig. 1 and 3, when the chainsaw 10 is required to cut, the guard mechanism 20 is brought into close contact with the workpiece W, and the cutting element 16 is allowed to emerge from the guard mechanism 20 to be accessible to the workpiece W by pressing the lock member 33 against the urging force of the elastic member 31 to release the lock on the guard mechanism 20. Of course, the lock release 30 of the present invention may also be mechanically actuated. For example, by adding a control knob which is linked to the locking member 33, the operator can press the control knob to generate the corresponding unlocking movement of the locking member 33. During cutting, the bottom edges 22a of the two parallel side walls 22 of the guard mechanism 20 always abut against the workpiece W due to the action of the biasing mechanism, firstly, a part of the cutting elements close to the workpiece W is exposed out of the guard mechanism 20, and as the cutting depth increases, the turning angle of the guard mechanism 20 relative to the support plate 14 gradually increases, and more cutting elements are exposed out of the guard mechanism 20 and enter the workpiece W. Until the cutting is completed, the working assembly 12 is separated from the workpiece W, the protection mechanism 20 automatically returns to the initial state under the action of the biasing mechanism, and the non-working position of the protection mechanism 20 is automatically locked by the lock release device 30. The guard mechanism 20 is configured such that once the chainsaw 10 is structurally operated, the cutting element 16 is restricted from being exposed to the guard mechanism 20 and accessible, reducing the chance of injury; in addition, in the cutting process, the protection mechanism 20 is always positioned above the cutting element 16 and abutted against the workpiece W, and at least part of chips and sawdust generated by cutting is blocked by the protection mechanism 20, so that the injury risk can be further reduced, and the safety of a user is ensured.

Referring to fig. 4 and 5, a second embodiment of the present invention is shown, which has a similar structure to the first embodiment, and therefore, the same elements are labeled with the same numerals and are not repeated. The difference from the first embodiment is that the top wall 40 of the guard mechanism 36 is made of metal, such as steel plate, although the specific metal used for the top wall 40 is not limited to steel plate. The top wall 40 is made of metal, and the side walls 38 may be made of engineering plastic, nylon, polycarbonate, etc. In the present embodiment, the top wall 40 and the side wall 38 are detachably connected by screw fasteners, and the detachable connection is not limited to screw fasteners. Of course, the top wall 40 and the side wall 38 may be connected together in a non-detachable manner in the present invention, for example, the top wall 40 and the side wall 38 may be combined together by an adhesive or by an in-mold molding process, but not limited to the above two manners. Because the top wall 40 is made of metal, the guard mechanism 36 still provides the operator with great protection in the event of a kickback during cutting. Moreover, the top wall 40 is made of metal, and the side wall 38 is made of non-metal, so that the safety performance of the protection mechanism 36 is guaranteed, the whole weight of the protection mechanism 36 is reduced, and the use by an operator is facilitated.

Referring to fig. 6 and 7, a third embodiment of the present invention is shown, which has a similar structure to the first embodiment, and therefore, the same elements are labeled with the same numerals and are not repeated. Unlike the first embodiment, the guard mechanism 42 includes an inner layer 44 adjacent the working assembly 12 and an outer layer 46 distal from the working assembly 12, the inner layer 44 being constructed of a metal skeleton. While the shield mechanism 42 is shown in this embodiment as being constructed with an inner layer 44 and an outer layer 46, it will be appreciated by those skilled in the art that the shield mechanism 42 may also be constructed with multiple layers and is not limited to only two layers. In the present embodiment, the outer layer 46 of the guard mechanism 42 is made of a shock absorbing and cushioning material, such as, but not limited to, foam or rubber. During actual cutting, if the chain saw kicks back, the pivotally disposed guard mechanism 42 tends to spring toward the operator due to the force of the kickback of the working assembly 12. The shock absorbing cushioning material of the outer layer 46 is configured to provide good protection to the operator. The inner layer 44 of the shielding mechanism 42 is constructed by a metal frame, and in this embodiment, the metal frame of the inner layer 44 includes a plurality of U-shaped metal strips distributed at intervals. The metal framework can be made of a steel plate with the thickness of 0.5-1.8mm, and the specific metal adopted by the metal framework is not limited to the steel plate with the thickness of 0.5-1.8 mm. The inner layer 44 and the outer layer 46 of the guard mechanism 42 may be bonded together by an adhesive or by an in-mold molding process, but are not limited to the above two methods. The inner layer 44 is made of a metal framework, so that the safety of the chain saw in the actual cutting and machining process of an operator in the reverse kicking situation can be effectively protected, the weight of the protection mechanism 42 can be greatly reduced, and the chain saw is safe, light and convenient to use by the operator.

Referring to fig. 8, a fourth embodiment of the present invention is shown, which has a similar structure to the first embodiment, and therefore, the same components are denoted by the same reference numerals and are not repeated. The difference from the first embodiment is that the end 52 of the top wall 50 of the guard mechanism 48 remote from the main housing 2 is made of metal. The end portion 52 may be, but is not limited to, a steel plate. Of course, the end of the whole protection mechanism 48 away from the main housing 2 may be made of metal, for example, aluminum alloy with a thickness of 2-5mm or steel plate with a thickness of 1-2mm, but is not limited thereto. The other parts of the protection mechanism 48 except the metal parts can be made of engineering plastics, nylon, polycarbonate and other materials. The metal and plastic parts of the guard mechanism 48 may be bonded together by an adhesive or by an in-mold molding process. During the actual cutting process of the operator, when the operator kicks back, the working module 12 is forced to strike the top wall 50 of the protection mechanism 48 away from the end 52 of the main housing 2, and when the operator kicks back, only the end 52 is actually struck by the working module 12. Because end 52 is made of metal, when being struck by the working assembly under the condition of kickback, the safety of an operator can be well protected, and only end 52 is made of metal, the weight of protection mechanism 48 can be further reduced, and a user can obtain better operation experience while the protection performance is not reduced. Those skilled in the art can appreciate that the technical effects to be achieved by the present embodiment can also be achieved by other manners, for example, the end portion 52 may not be made of metal, but only some metal meshes or metal strips are added on the basis of the original material to increase the hardness of the end portion 52, so as to prevent the working assembly 12 from being cut through when reverse kicking occurs during the operation process, thereby effectively ensuring the safety of the operator.

The present invention is not limited to the above-described embodiments, and other modifications are possible in the technical spirit of the present invention by those skilled in the art, and all that can be achieved is intended to be covered by the scope of the present invention as long as the functions achieved are the same as or similar to those of the present invention.

Claims

1. A chain saw, comprising: a working assembly having a cutting element and a support plate supporting the cutting element; a power drive for driving the cutting element to move about the support plate; a main machine housing accommodating the power driving device; a handle device connected to the main machine housing; a guard mechanism disposed on the working assembly; the method is characterized in that: the guard mechanism is at least partially made of metal.

2. The chain saw as recited in claim 1, wherein: the protection mechanism is arranged in a pivoting mode relative to the main machine shell.

3. The chain saw as recited in claim 1, wherein: and a plurality of observation windows are arranged on the protection mechanism.

4. The chain saw as recited in claim 1, wherein: the protection mechanism comprises a top wall and a plurality of side walls extending from the top wall, the top wall and the side walls form a protection space capable of completely receiving the working assembly, and the protection space is provided with an opening which faces downwards.

5. The chain saw as recited in claim 4, wherein: the top wall of the guard mechanism is made of metal.

6. The chain saw as recited in claim 5, wherein: the metal is a steel plate.

7. The chain saw as recited in claim 1, wherein: the protection mechanism comprises an inner layer close to the working assembly and an outer layer far away from the working assembly, and the inner layer is of a metal framework structure.

8. The chain saw as recited in claim 7, wherein: the outer layer is made of a damping and buffering material.

9. The chain saw as recited in claim 8, wherein: the shock absorption buffer material is foam plastic or rubber.

10. The chain saw as recited in claim 7, wherein: the inner and outer layers of the protective mechanism are bonded together by an adhesive.

11. The chain saw as recited in claim 7, wherein: the metal framework comprises a plurality of U-shaped metal strips distributed at intervals.

12. The chain saw as recited in claim 7, wherein: the metal framework is made of a steel plate with the thickness of 0.5-1.8 mm.

13. The chain saw as recited in claim 1, wherein: the end part of the protection mechanism far away from the main machine shell is made of metal.

14. The chain saw as recited in claim 13, wherein: the end part of the protection mechanism far away from the host shell is made of aluminum alloy with the thickness of 2-5mm or steel plate with the thickness of 1-2 mm.

15. The chain saw as recited in claim 4, wherein: the end part of the top wall of the protection mechanism far away from the main machine shell is made of metal.

16. The chain saw as recited in claim 4, wherein: the end part of the top wall of the protection mechanism far away from the main machine shell is made of a steel plate.