A chain saw with rapid braking

Abstract

The invention discloses a chain saw with rapid braking, comprising a machine head and a chain plate and a saw chain connected to the front end of the machine head. The machine head comprises a housing, an elastic trigger, a switch, and a driving device and a braking device arranged in the housing. The driving device is connected to the saw chain to drive the saw chain. A brake member is arranged on the driving device. The braking device comprises an elastic reset member, a brake link and a brake rod. One end of the brake rod is connected to the elastic reset member and the other end is connected to the brake link. The elastic trigger triggers the switch by pulling the brake link, and the elastic reset member presses the brake member to brake by pulling the brake rod. The invention drives the brake link to trigger the switch by the elastic trigger, so that the driving device drives the saw chain to cut trees. When the electric chain saw jumps up, the user releases the elastic trigger, and the elastic reset member pulls the brake link away from the switch through the brake rod under the action of elastic force to cut off the power supply of the driving device, and pulls the brake rod to contact the brake member to brake the driving device, which is safer to use.

Description

Technical Field

[0001] The invention belongs to the field of garden machinery, and in particular relates to a fast-braking chain saw. Background Art

[0002] The electric chain saw is a traditional power tool. In actual operation, it is dangerous. If the saw chain hits a hard object such as a tree knot or metal object when cutting trees, the electric chain saw may break away from the operator's hand and jump toward the operator's body, causing the running saw chain to cut the operator. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fast-braking chain saw to solve at least one of the above problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a chain saw with rapid braking, comprising a machine head and a chain plate and a saw chain connected to the front end of the machine head, the machine head comprising a shell, an elastic trigger, a switch, and a driving device and a braking device arranged in the shell, the driving device is connected to the saw chain to drive the saw chain, the driving device is provided with a brake member, the braking device comprises an elastic reset member connected to the shell, a brake connecting rod and a brake rod rotatably connected to the shell, one end of the brake rod is connected to the elastic reset member, and the other end is connected to the brake connecting rod, the elastic trigger triggers the switch by pulling the brake connecting rod, and the elastic reset member presses the brake member to brake by pulling the brake rod.

[0005] In the above-mentioned fast-braking chain saw, the brake link includes a vertically arranged trigger rod and a connecting rod, the trigger rod includes a mounting end and a trigger end, the trigger rod is connected to the middle part of the connecting rod through the mounting end to form a "T-shaped" brake link, and the elastic trigger triggers the switch by pulling the trigger end.

[0006] In the above-mentioned fast-braking chain saw, the linkage rod includes a first linkage end and a second linkage end, the first linkage end is provided with a slide groove, and the end of the brake rod is provided with a rotating shaft extending into the slide groove so that the linkage rod and the brake rod are slidably connected.

[0007] In the above-mentioned fast-braking chain saw, the braking device also includes a protective plate arranged outside the shell and a driving rod arranged inside the shell, one end of the driving rod is connected to the protective plate for common rotation, and the other end is rotationally connected to the second linkage end.

[0008] In the above-mentioned fast-braking chain saw, a positioning groove is provided on the driving rod, and a reset rod and an elastic member are rotatably connected in the housing, and the elastic member pushes the reset rod to snap into the positioning groove.

[0009] In the above-mentioned fast-braking chain saw, a trigger protrusion located at the lower part of the switch is provided on the trigger end, and a pulling protrusion abutting against the bottom of the trigger protrusion is provided on the elastic trigger.

[0010] In the above-mentioned fast-braking chain saw, the driving device includes a driving assembly and a transmission assembly, the driving assembly drives the saw chain through the transmission assembly, and the brake lever brakes by separating the driving assembly and the transmission assembly.

[0011] In the above-mentioned fast-braking chain saw, the driving assembly includes a driving motor and a reduction gear connected to the driving motor, the reduction gear includes a gear shaft, the transmission assembly includes an output shaft, and the brake member is a transmission torsion spring whose two ends are respectively sleeved on the outside of the output shaft and the gear shaft to drive the two to rotate. The brake rod abuts against the end of the transmission torsion spring to separate the transmission torsion spring from the output shaft or the gear shaft.

[0012] In the above-mentioned fast-braking chain saw, the end of the brake lever abuts against one end of the transmission torsion spring close to the gear shaft, so that one end of the torsion spring is separated from the gear shaft and the other end holds the transmission shaft tightly.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention drives the brake link to trigger the switch through the elastic trigger, so that the driving device drives the saw chain to cut the tree. When the electric chain saw is separated from the user's hand due to hitting a relatively hard object such as a tree knot or a metal object and jumps toward the user's body, at the moment of separation from the user's hand, the user releases the elastic trigger, and the elastic trigger no longer limits the brake link. Under the action of elastic force, the elastic reset member pulls the brake link away from the switch through the brake rod to cut off the power supply of the driving device, and pulls the brake rod to contact the brake member to brake the driving device, thereby achieving the power supply of the driving device being cut off and the driving device being braked, so that the electric chain saw can be quickly stopped and emergency braked to prevent the running saw chain from cutting the user, and the use is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0016] Figure 1 An exploded view of a chain saw with rapid braking according to the present invention;

[0017] Figure 2 A cross-sectional view of a fast-braking chain saw of the present invention in an unbraked state;

[0018] Figure 3 for Figure 2 A magnified view of part A;

[0019] Figure 4 for Figure 2 A magnified view of part B;

[0020] Figure 5 A cross-sectional view of a fast-braking chain saw in a braking state according to the present invention;

[0021] Figure 6 for Figure 5 Enlarged view of part C;

[0022] Figure 7 for Figure 5 Enlarged view of part D.

[0023] Reference numerals:

[0024] 100, housing; 110, brake member; 200, elastic trigger; 210, pulling protrusion; 300, switch; 400, driving assembly; 410, driving motor; 420, reduction gear; 500, transmission assembly; 600, elastic reset member; 700, brake connecting rod; 710, trigger rod; 711, mounting end; 712, trigger end; 713, trigger protrusion; 720, linkage rod; 721, first linkage end; 722, second linkage end; 723, slide groove; 800, brake rod; 810, rotating shaft; 900, protective plate; 910, driving rod; 911, positioning groove; 920, reset rod; 930, elastic member. DETAILED DESCRIPTION

[0025] The present invention provides a fast-braking chain saw, comprising a machine head and a chain plate and a saw chain connected to the front end of the machine head. The machine head comprises a shell, an elastic trigger, a switch, and a driving device and a braking device arranged in the shell. The driving device is connected to the saw chain to drive the saw chain. A brake member is provided on the driving device. The braking device comprises an elastic reset member connected to the shell, a brake connecting rod and a brake rod rotatably connected to the shell. One end of the brake rod is connected to the elastic reset member, and the other end is connected to the brake connecting rod. The elastic trigger triggers the switch by pulling the brake connecting rod, and the elastic reset member presses the brake member to brake by pulling the brake rod. The present invention drives the brake link to trigger the switch through the elastic trigger, so that the driving device drives the saw chain to cut the tree. When the electric chain saw is separated from the user's hand due to hitting a relatively hard object such as a tree knot or a metal object and jumps toward the operator's body, at the moment of separation from the user's hand, the user releases the elastic trigger, and the elastic trigger no longer limits the brake link. Under the action of elastic force, the elastic reset member pulls the brake link away from the switch through the brake rod to cut off the power supply of the driving device, and pulls the brake rod to contact the brake member to brake the driving device, thereby achieving the power supply of the driving device being cut off and the driving device being braked, so that the electric chain saw can be quickly stopped and emergency braked to prevent the running saw chain from cutting the user, and the use is safer.

[0026] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] Embodiment 1:

[0032] A fast-braking chain saw, such as Figures 1 to 7As shown, it includes a machine head and a chain plate and a saw chain connected to the front end of the machine head. The machine head includes a shell 100, an elastic trigger 200, a switch 300, and a driving device and a braking device arranged in the shell 100. The elastic trigger 200 and the switch 300 are arranged on the shell 100. The driving device is connected to the saw chain to drive the saw chain. The driving device is provided with a brake component. The braking device includes an elastic reset component 600 connected to the shell 100, a brake link 700 and a brake rod 800 rotatably connected to the shell 100. One end of the brake rod 800 is connected to the elastic reset component 600, and the other end is connected to the brake link 700.

[0033] When the chain saw needs to be turned on, the user presses the elastic trigger 200, and the elastic trigger 200 moves toward the switch 300 and pulls the end of the brake link 700 toward the switch 300, so that the brake link 700 contacts the switch 300 to trigger the switch 300. The switch 300 is triggered to energize the drive device and drive the saw chain to cut. At the same time, the end of the brake link 700 moves upward due to the pull of the elastic trigger 200, so the other end of the brake link 700 connected to the brake rod 800 also pulls the brake rod 800 upward at the same time, so that the end of the brake rod 800 close to the brake member rotates in the direction away from the brake member and pulls the elastic reset member 600.

[0034] When the chain saw needs to be turned off and braked, the user releases the pressed elastic trigger 200, and the elastic trigger 200 moves away from the switch 300 under the action of the elastic force to reset. At this time, the elastic trigger 200 no longer pulls the brake link 700 upwards. After the brake link 700 loses the force pulling it upwards, the elastic reset member 600 pulls the brake rod 800 in the direction of the brake member under the action of the elastic force, so that the end of the brake rod 800 contacts the brake member to brake the drive device. While one end of the brake rod 800 rotates toward the brake member to brake, the other end pulls the brake link 700 in the direction away from the switch 300, so that the end of the brake link 700 disengages from the switch 300 to stop triggering the switch 300, cuts off the power supply of the drive device, and stops the operation of the saw chain.

[0035] The present invention drives the brake link 700 to trigger the switch 300 through the elastic trigger 200, so that the driving device drives the saw chain to cut trees. When the electric chain saw is separated from the user's hand and jumps toward the user's body due to hitting a relatively hard object such as a tree knot or a metal object, the user releases the elastic trigger 200 at the moment of separation from the user's hand, and the elastic trigger 200 no longer limits the brake link 700. The elastic reset member 600 pulls the brake link 700 away from the switch 300 through the brake rod 800 under the action of elastic force to cut off the power supply of the driving device, and pulls the brake rod 800 to contact the brake member to brake the driving device, thereby achieving the power supply of the driving device being cut off and the braking of the driving device, so that the electric chain saw can be quickly stopped and emergency braked to prevent the running saw chain from cutting the user, and the use is safer.

[0036] In this embodiment, the brake link 700 includes a trigger rod 710 and a connecting rod 720 which are vertically arranged. The trigger rod 710 includes a mounting end 711 and a trigger end 712. The trigger rod 710 is connected to the middle part of the connecting rod 720 through the mounting end 711 to form a "T-shaped" brake link 700. The elastic trigger 200 triggers the switch 300 by pulling the trigger end 712. The connecting rod 720 includes a first connecting end 721 and a second connecting end 722. A sliding groove 723 is provided on the first connecting end 721. A rotating shaft 810 extending into the sliding groove 723 is provided at the end of the brake rod 800 to enable the connecting rod 720 to be slidably connected to the brake rod 800.

[0037] The braking device in this embodiment also includes a protective plate 900 disposed outside the shell 100 and a driving rod 910 disposed inside the shell 100 . One end of the driving rod 910 is connected to the protective plate 900 for common rotation, and the other end is rotatably connected to the second linkage end 722 . When the user is using the electric chain saw, the protective plate 900 is located between the user's hand and the saw chain. When one end of the saw chain of the electric chain saw jumps toward the user's body, the user's hand will touch the protective plate 900 and push the protective plate 900 toward the saw chain at the front end of the machine head. The protective plate 900 rotates in the direction of the saw chain, driving the driving rod 910 to rotate toward the front end of the machine head. The driving rod 910 pulls the connecting rod 720 toward the front end of the machine head through the second connecting end 722, so that the trigger end 712 is disengaged from between the switch 300 and the elastic trigger 200. Even if the user's hand is still pressing on the elastic trigger 200, the drive device can be powered off and the elastic trigger 200 cannot continue to limit the brake link 700. Finally, the elastic reset member 600 pulls the brake rod 800 to contact the brake member under the action of the elastic force to brake the drive device. Even if the user does not release the elastic trigger 200, emergency braking can be performed through the protective plate 900. When the elastic trigger 200 is stuck or the user cannot release the elastic trigger 200, braking is performed, which is safer and more reliable. In this embodiment, preferably, the trigger end 712 is provided with a trigger protrusion 713 located at the lower part of the switch 300, and the elastic trigger 200 is provided with a pulling protrusion 210 that abuts against the bottom of the trigger protrusion 713. The elastic trigger 200 drives the trigger protrusion 713 to move by pulling the protrusion 210, which is more stable and reliable.

[0038] In this embodiment, a positioning groove 911 is provided on the driving rod 910, and a reset rod 920 and an elastic member 930 are rotatably connected in the housing 100. One end of the elastic member 930 is fixed in the housing 100, and the other end is against the reset rod 920. The elastic member 930 pushes the reset rod 920 in the direction of the positioning groove 911 under the action of elastic force so that the protrusion on the reset rod 920 is stuck in the positioning groove 911. When the user pushes the protective plate 900 forward, after the positioning groove 911 passes over the protrusion, the reset rod 920 pushes the driving rod 910 forward under the push of the elastic member 930. With the assistance of the elastic member 930, the driving rod 910 can more quickly drive the trigger end 712 of the brake link 700 to disengage from the switch 300 and the elastic trigger 200, and the braking is faster.

[0039] In this embodiment, the driving device includes a driving component 400 and a transmission component 500. The driving component 400 drives the saw chain through the transmission component 500. The brake rod 800 brakes by separating the driving component 400 and the transmission component 500, so that the driving component 400 no longer continues to drive the transmission component 500 to rotate, thereby achieving the effect of cutting off the driving source of the saw chain. Compared with the friction braking of the brake pad, the braking effect of separating the driving component 400 and the transmission component 500 is better, which prevents the brake failure caused by the contact failure of the brake pad. Preferably, the drive assembly 400 includes a drive motor 410 and a reduction gear 420 connected to the drive motor 410, the reduction gear 420 includes a gear shaft, the transmission assembly 500 includes an output shaft, and the brake member is a transmission torsion spring whose two ends are respectively sleeved on the outside of the output shaft and the gear shaft to drive the two to rotate, and the transmission torsion spring is tightly clamped on the outside of the output shaft and the gear shaft. During braking, the end of the brake rod 800 is abutted against the end of the transmission torsion spring close to the gear shaft, so that the inner diameter of the end of the transmission torsion spring close to the gear shaft becomes larger, and the transmission torsion spring no longer clamps the gear shaft, that is, the transmission between the gear shaft and the output shaft through the transmission torsion spring is stopped, and at the same time, the end of the transmission torsion spring close to the output shaft clamps the transmission shaft to brake the transmission shaft.

[0040] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A fast-braking chain saw, comprising a machine head and a chain plate and a saw chain connected to the front end of the machine head, the machine head comprising a housing, an elastic trigger, a switch, and a driving device and a braking device arranged in the housing, the driving device being connected to the saw chain to drive the saw chain, characterized in that: The driving device is provided with a brake part, and the brake device includes an elastic return part connected to the shell, a brake connecting rod and a brake rod rotatably connected in the shell, one end of the brake rod is connected to the elastic return part, and the other end is connected to the brake connecting rod, the elastic trigger triggers the switch by pulling the brake connecting rod, and the elastic return part presses the brake part to brake by pulling the brake rod, the brake device also includes a driving rod arranged in the shell, the driving rod is provided with a positioning groove, a reset rod and an elastic part are rotatably connected in the shell, the elastic part pushes the reset rod to fit into the positioning groove, the brake connecting rod includes a vertically arranged trigger rod and a connecting rod, the trigger rod includes a trigger end, and the trigger end is provided with a trigger protrusion located at the lower part of the switch.

2. A fast-braking chain saw according to claim 1, characterized in that: The trigger rod includes a mounting end, and the trigger rod is connected to the middle part of the linkage rod through the mounting end to form a "T-shaped" brake linkage, and the elastic trigger triggers the switch by pulling the trigger end.

3. A fast-braking chain saw according to claim 2, characterized in that: The linkage rod comprises a first linkage end and a second linkage end. A sliding groove is arranged at the end of the brake rod. The first linkage end is provided with a rotating shaft extending into the sliding groove so that the linkage rod is slidably connected with the brake rod.

4. A fast-braking chain saw according to claim 3, characterized in that: The braking device further comprises a protection plate arranged outside the shell, one end of the driving rod is connected to the protection plate for common rotation, and the other end is rotationally connected to the second linkage end.

5. A fast-braking chain saw according to claim 2, characterized in that: The elastic trigger is provided with a pulling protrusion which abuts against the bottom of the triggering protrusion.

6. A fast-braking chain saw according to any one of claims 1 to 5, characterized in that: The driving device comprises a driving assembly and a transmission assembly. The driving assembly drives the saw chain through the transmission assembly. The brake lever brakes by separating the driving assembly and the transmission assembly.

7. A fast-braking chain saw according to claim 6, characterized in that: The driving assembly includes a driving motor and a reduction gear connected to the driving motor, the reduction gear includes a gear shaft, the transmission assembly includes an output shaft, the brake component is a transmission torsion spring whose two ends are respectively sleeved on the outside of the output shaft and the gear shaft to drive the two to rotate, and the brake rod abuts against the end of the transmission torsion spring to separate the transmission torsion spring from the output shaft or the gear shaft.

8. A fast-braking chain saw according to claim 7, characterized in that: The end of the brake rod abuts against one end of the transmission torsion spring close to the gear shaft, so that one end of the torsion spring is separated from the gear shaft and the other end tightly holds the transmission shaft.

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