Chain saw with brake arrangement

Abstract

The application discloses a chain saw with a brake structure, which comprises a casing, a motor, a gear box, a brake assembly, a switch and a chain saw assembly are arranged in the casing, a switch trigger assembly is arranged at the rear end of the casing, a brake switch assembly is arranged on the casing, the brake switch assembly comprises a brake trigger which can be horizontally translated on the casing, a brake connecting rod is rotatably connected to the brake trigger and located above the switch, and the brake connecting rod is connected with the brake assembly. Through the above mode, the chain saw with the brake structure can normally turn off and brake the chain saw through the switch trigger assembly under the starting state of the chain saw, and can also turn off and brake the chain saw through the brake trigger, so that the double switch structure is safe and reliable in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chain saws, in particular to a chain saw with a brake structure. BACKGROUND

[0002] The electric chain saw is a kind of electric tool which is widely used. Since the sawtooth of the electric chain saw is exposed and has a high rotating speed, the safety of use is very important. Since the chain saw blade of the electric chain saw will form a recoil towards the operator due to accidental collision during use, which brings danger to the operator, the brake device is generally installed in the electric chain saw.

[0003] The existing brake mechanism of the electric chain saw has a complex structure, and the production and assembly are more cumbersome, the cost is higher, and generally only the stop / start of the switch button can brake / release the power structure of the electric chain saw and open / close the circuit of the electric chain saw, and lacks protective measures. SUMMARY

[0004] The technical problem solved by the present application is to provide a chain saw with a brake structure, which can normally turn off the chain saw and brake the chain saw under the starting state of the chain saw through the switch trigger assembly, and can also turn off and brake the chain saw through the brake trigger, with double switch structure, safe and reliable to use.

[0005] To solve the above technical problems, one technical scheme adopted by the present application is to provide a chain saw with a brake structure, comprising a machine shell, a motor, a gear box, a brake assembly, a switch and a chain saw assembly are arranged in the machine shell, a switch trigger assembly is arranged at the rear end of the machine shell, a brake switch assembly is arranged on the machine shell, the brake switch assembly comprises a brake trigger which can translate left and right in the machine shell, a brake connecting rod above the switch is rotationally connected to the brake trigger, the brake connecting rod is connected with the brake assembly, the brake connecting rod has a first position in contact with the switch trigger assembly, under the first position, the switch trigger assembly presses down or releases the brake connecting rod, so that the brake connecting rod presses down or releases the switch and the brake assembly, so as to make the switch open and the brake assembly unlock, or make the switch close and the brake assembly brake; the brake plate drives the brake connecting rod to translate, so that the brake connecting rod is located at a second position separated from the switch trigger assembly, under the second position, the brake connecting rod is separated from the switch and releases the brake assembly, so as to make the brake assembly brake and the switch be in a closed state which cannot be opened.

[0006] In a preferred embodiment of the present application, the brake assembly comprises a connecting plate rotatably connected to the gear box, the right end of the connecting plate is connected to the gear box through a spring, the left end of the connecting plate is provided with a sliding groove, the brake steel belt is connected to the left end of the connecting plate, the connecting column of the left end of the brake connecting rod is movably connected in the sliding groove, in the first position, the connecting column presses or releases the connecting plate to make the connecting plate reciprocate, so that the brake steel belt is in the unlocking state or the braking state, in the second position, the connecting column moves right relative to the sliding groove, so that the connecting plate rotates right, so that the brake steel belt is in the braking state.

[0007] In a preferred embodiment of the present application, in the first position, the connecting column is located at the left side of the sliding groove, in the second position, the connecting column is located at the right side of the sliding groove.

[0008] In a preferred embodiment of the present application, the gear box is provided with a brake disc fixedly connected to the transmission shaft, the lower end of the brake steel belt is sleeved outside the brake disc, and the upper end of the brake steel belt is connected to the connecting plate, the rotation of the connecting plate makes the brake steel belt contact or separate from the brake disc, so that the brake assembly is in the braking state or the unlocking state.

[0009] In a preferred embodiment of the present application, a plurality of grooves are uniformly arranged circumferentially in the gear box, the isolation blocks are fixedly arranged in the grooves, the isolation blocks are located outside the lower end of the brake steel belt, and the outside of the isolation blocks protrudes inward in the radial direction to block the brake steel belt from contacting the inner wall of the gear box.

[0010] In a preferred embodiment of the present application, the right end of the brake connecting rod is rotatably connected to the brake trigger, and the left end is provided with a contact pushing surface, the switch trigger assembly presses the contact pushing surface to make the right end of the brake connecting rod rotate around the brake trigger, and the switch trigger assembly releases the contact pushing surface to release the brake connecting rod.

[0011] In a preferred embodiment of the present application, the switch trigger assembly comprises a switch trigger rotatably connected to the casing, the right end of the switch trigger is connected to the contact block through a transmission shaft, the contact block is rotatably connected to the casing and the gear box, in the first position, the contact block contacts and presses the contact pushing surface to press the brake connecting rod, in the second position, the contact block releases the contact pushing surface to release the brake connecting rod, and in the second position, the contact block is separated from the contact pushing surface to release the brake connecting rod.

[0012] In a preferred embodiment of the present application, the brake connecting rod and the connecting plate are arranged in parallel, and the connecting plate is located in front of the brake connecting rod.

[0013] In a preferred embodiment of the present application, the right end of the casing is provided with a mounting groove, the lower end of the brake trigger is movably connected in the mounting groove and slides left and right along the mounting groove, and extends into the casing to be connected with the brake connecting rod.

[0014] The chain saw with the brake structure has the following beneficial effects: the brake link is separated from the switch in the normal closing state of the chain saw, and the brake assembly is in the braking state; the switch trigger assembly is pressed to open the switch through the brake link and release the brake assembly, so that the chain saw can be normally started; the brake link plays a dual role of opening the switch and releasing the brake, and the structure of the switch is simplified.

[0015] The chain saw with the brake structure can realize emergency shutdown and braking by translating the brake trigger, synchronously moving the brake link to be separated from the switch, closing the switch and braking the chain saw through the brake assembly in the normal working state of the chain saw.

[0016] The chain saw with the brake structure can effectively avoid misstarting caused by accidentally touching the switch trigger assembly after emergency braking, and ensure use safety. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 is a structure schematic view of a preferred embodiment of the chain saw with the brake structure;

[0019] Figure 2 is an internal structure schematic view of Figure 1 ;

[0020] Figure 3 is a shutdown state schematic view of the chain saw with the brake structure in the first position;

[0021] Figure 4 is a rear view of Figure 3 ;

[0022] Figure 5 is a start state schematic view of the chain saw with the brake structure in the first position;

[0023] Figure 6 is a rear view of Figure 5 ;

[0024] Figure 7 is a schematic view of the chain saw with the brake structure in the first position;

[0025] Figure 8 isa rear view of Figure 7 a rear view of

[0026] Figure 9 a rear view of Figure 7 a rear view of

[0027] Figure 10 a rear view of Figure 2 a rear view of

[0028] Figure 11 a rear view of

[0029] Figure 12 a rear view of

[0030] Figure 13 a rear view of

[0031] The reference signs of the components in the drawings are as follows: 1, a casing, 11, a mounting groove, 2, a motor, 3, a gear box, 31, a brake disc, 32, a spacer block, 4, a chain saw assembly, 5, a brake assembly, 51, a connecting plate, 511, a sliding groove, 52, a spring, 51, a brake steel band, 6, a switch, 7, a brake switch assembly, 71, a brake trigger, 72, a brake connecting rod, 721, a contact push surface, 722, a connecting column, 8, a switch trigger assembly, 81, a switch trigger, 82, a transmission shaft, 83, a contact block. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below. The structures, proportions, sizes, etc. shown in the drawings of the present specification are merely used to cooperate with the content disclosed in the present specification, to enable those skilled in the art to understand and read, and are not used to limit the defined conditions under which the present application can be implemented, and therefore do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in the present specification are merely for the convenience of understanding and clarity of description, and are not used to limit the implementable range, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the implementable scope of the present application.

[0033] Please refer to Figures 1 to 13A chain saw with brake structure, comprising a casing 1, a motor 2, a gear box 3, a chain saw assembly 4, a brake assembly 5 and a switch 6 are arranged in the casing 1. The brake assembly 5 and the switch 6 can be connected to the gear box 3 or the casing 1, or can be assembled and connected by other connecting members. The switch serves as a master control switch and is responsible for the power supply of the motor 2. The electrical connection structure of the switch 6 and the motor 2 and the power supply is connected in the conventional manner in the art, which will not be described here. The motor 2 drives the chain saw assembly 4 to move through the gear box 3 and is powered by a battery pack. The arrangement of the motor 2, the gear box 3 and the chain saw assembly 4 adopts a conventional structure.

[0034] A brake switch assembly 7 is arranged on the casing 1. The brake switch assembly 7 comprises a brake trigger 71 which can translate left and right on the casing 1, and a brake connecting rod 72 which is rotatably connected to the brake trigger 71 and located above the switch 6. The brake connecting rod 72 is arranged in parallel with the connecting plate 51, and the connecting plate 51 is located in front of the brake connecting rod 72. The right end of the casing 1 is provided with a mounting groove 11, and the lower end of the brake trigger 71 is movably connected in the mounting groove 11 and slides left and right along the mounting groove 11, and extends into the casing 1 and is connected with the brake connecting rod 72. The right end of the brake connecting rod 72 is rotatably connected to the brake trigger 71, and the left end has a contact push surface 721. When the contact push surface 721 acts on the brake connecting rod 72 and contacts the contact block 83, the contact push surface 721 is pushed by the contact block 83 to make the brake connecting rod 72 move. The right end of the brake connecting rod 72 is rotatably connected to the brake trigger, so that the brake connecting rod 72 has a rotation angle. The brake trigger 71 can translate on the casing 1, and the brake trigger 71 translates right to drive the brake connecting rod 72 to move synchronously, so that the contact push surface 721 is separated from the contact block 83, and at this time the switch trigger assembly 8 no longer has the function of switch. Conversely, when the brake trigger 71 moves left, the contact block 83 contacts the contact push surface 721, and the switch trigger assembly 8 has the function of switch.

[0035] The brake assembly 5 comprises a connecting plate 51 which is rotatably connected to the gear box 3. The right end of the connecting plate 51 is connected to the gear box 3 by a spring 52, and the left end of the connecting plate 51 has a sliding groove 511. The brake steel belt 53 is connected to the left end of the connecting plate 51. The connecting column 722 of the left end of the brake connecting rod 72 is movably connected in the sliding groove 511. The spring 52 is always in tension, constantly providing tension to the right end of the connecting plate 51, so that the connecting plate 51 will deflect to the right under no external force, that is, the sliding groove 511 of the connecting plate 51 is in a state of no pressure provided by the connecting column 722, and the brake steel belt 53 is in a state of brake. When the brake connecting rod 72 moves, the force is transmitted to the connecting plate 51 through the connecting column 722, the brake connecting rod 72 rotates downward, and the connecting column 722 synchronously drives the connecting plate 51 to rotate downward, at this time the brake steel belt 53 releases the brake disc, and the brake assembly 5 is in an unlocked state.

[0036] The rear end of the casing 1 is provided with a switch trigger assembly 8. The switch trigger assembly 8 comprises a switch trigger 81 rotatably connected to the casing 1. The right end of the switch trigger 81 is connected with a contact block 83 through a transmission shaft 82. The contact block 83 is rotatably connected to the casing 1 and the gear box 3 。 When the switch trigger 81 is pressed, the switch trigger 81 is rotated upward, driving the transmission shaft 82 to push the contact block 83 to rotate downward. In the initial state, when the switch trigger 81 is pressed, the brake connecting rod 72 is pressed downward through the contact block 83, and the brake connecting rod 72 is rotated under the force. When the brake connecting rod 72 contacts the switch 6 below, the connecting plate 51 moves downward synchronously with the brake connecting rod 72, the brake steel belt 53 releases the brake disc of the gear box 3, and the gear box 3 is unlocked. At this time, the chain saw is powered on and starts to start, which is the normal starting state.

[0037] As shown in Figure 12 and Figure 13 , the gear box 3 has a brake disc 31 fixedly connected with the transmission shaft 82, and the brake steel belt 53 has a lower end sleeved outside the brake disc and an upper end connected with the connecting plate 51. The rotation of the connecting plate 51 makes the brake steel belt 53 contact or separate from the brake disc, so that the brake assembly 5 is in the braking state or the unlocking state. When the brake steel belt 53 is separated from the brake disc, the gear box 3 can normally output power to the chain saw assembly 4. When the connecting plate 51 is lifted and rotated upward, the brake steel belt 53 is lifted upward synchronously, and the lower end of the brake steel belt 53 tightly holds the brake disc, thereby braking the gear box 3.

[0038] A plurality of grooves are uniformly formed in the circumferential direction in the gear box 3, and a separation block 32 is fixedly arranged in the grooves. The separation block is located outside the lower end of the brake steel belt 53, and the outer side of the separation block 32 protrudes radially inward to block the brake steel belt 53 from contacting the inner wall of the gear box 3. In the unlocking state of the brake assembly 5, the brake steel belt 53 and the inner wall of the gear box 3 are arranged in a gap, and the brake steel belt 53 will move upward in the braking state. Because the brake steel belt 53 holds the brake disc, a large amount of heat will be generated due to friction. In order to prevent the heat generated by the brake steel belt 53 and the brake disc after moving upward from being transmitted to the gear box 3, the separation block 32 separates the brake steel belt 53 and the inner wall of the gear box 3. At the same time, ventilation grooves can be formed on the surface of the gear box 3 to achieve internal heat dissipation.

[0039] When the chain saw is in the initial state, that is, the brake trigger 71 is at the leftmost side, and the switch trigger 81 is not pressed, at this time, the contact pushing surface 721 of the brake connecting rod 72 contacts the contact block 83. The initial state is the first position, and in the first position, the left end of the brake connecting rod 72 is just above the switch 6.

[0040] As shown in Figure 3 and Figure 4As shown, in the first position, the switch trigger 81 is pressed, the switch trigger 81 drives the brake link 72 to rotate downward through the contact block 83, at this time the brake link 72 will touch the contact on the switch 6, the switch 6 is opened, the chain saw starts to start. At this time, the connecting column 722 is located on the left side of the sliding groove 511, the brake link 72 drives the sliding groove 511 to move downward through the connecting column 722, so that the connecting plate 51 is driven by the brake link 72 to move downward synchronously, the brake steel belt 53 is separated from the brake disc, the brake disc is in the unlocked state, the gear box 3 can rotate normally, at this time the motor drives the chain saw to work normally through the gear box 3. As shown in Figure 5 And Figure 6 As shown, the opposite is also true, the switch trigger 81 is released, the contact opposite loses the pressure of the contact block 83, the connecting plate 51 is pulled back to the original position under the action of the spring 52, the connecting plate 51 synchronously reversely drives the brake link 72 to reset, the switch 6 is disconnected, and the brake disc is locked again.

[0041] As shown in Figures 7 to 9 Suppose that the chain saw needs to be braked in an emergency during normal operation, at this time the brake trigger 71 is pushed to move to the right, the brake link 72 moves to the right synchronously, the contact push surface 721 of the brake link 72 is separated from the contact block 83, at this time it is the second position, the connecting column 722 is located on the right side of the sliding groove 511. In this state, because the contact push surface 721 is separated from the contact block 83, the contact block 83 no longer provides pressure to the contact push surface 721, the connecting plate 51 is pulled back to the original position under the action of the spring 52, the connecting plate 51 synchronously reversely drives the brake link to rotate and reset. At the same time, because the brake link 72 is translated by the brake trigger 71, the brake link 72 is also staggered with the switch 6 in the vertical direction. Therefore, in the second position, the brake link 72 and the switch 6 do not overlap in any part in the horizontal and vertical directions, the switch 6 is disconnected, the brake assembly 5 is braked again, the chain saw is stopped and braked, and the state is maintained until it is completely stopped. In the second state, because the brake link 72 is separated from the switch 6 and the contact block 83, no matter how the switch trigger 81 is pressed, the switch 6 will not be opened again, in this state, the chain saw cannot be started by mistake, only when the switch trigger 81 is released and the brake trigger 71 is moved to the left to reset to the first position, the chain saw can be started again. Therefore, the second position is equivalent to the forced closing state of the chain saw, and the chain saw cannot be started by any operation. Further, even if the switch 6 fails in this case, the brake assembly 5 can still brake in an emergency, which improves the personal safety of the operator, gives the operator time to remove the battery, and effectively ensures the safety of the operator.

[0042] The brake plate machine drives the brake link 72 to translate so that the brake link 72 is located in the second position separated from the switch trigger assembly 8, in the second position, the brake link 72 is separated from the switch 6 and releases the brake assembly 5, so that the brake assembly 5 is braked and the switch 6 is in the closed state that cannot be started.

[0043] Different from the prior art, the chain saw with the brake structure can normally turn off and brake the chain saw through the switch trigger assembly in the starting state of the chain saw, and can also turn off and brake the chain saw through the brake trigger, and the double-switch structure is safe and reliable in use.

[0044] The above description of the present application and its embodiments is illustrative only, and is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the spirit of the present application, similar structural modes and embodiments can be designed without creativity, and all of them shall belong to the protection scope of the present application.

Claims

1. A chain saw with brake structure, comprising a casing, a motor, a gear box, a brake assembly, a switch and a chain saw assembly are arranged in the casing, a switch trigger assembly is arranged at the rear end of the casing, characterized in that, The brake switch assembly is arranged on the casing, and comprises a brake trigger capable of moving leftward and rightward on the casing, a brake connecting rod rotatably connected to the brake trigger and located above the switch, and a brake assembly connected to the brake connecting rod. The brake assembly comprises a connecting plate rotatably connected to the gear box, a ventilation slot is arranged on the surface of the gear box, the right end of the connecting plate is connected to the gear box through a spring, the left end of the connecting plate is provided with a sliding groove, a brake steel belt is connected to the left end of the connecting plate, and a connecting column at the left end of the brake connecting rod is movably connected to the sliding groove. The connecting column is located on the left side of the sliding groove in the first position, and the connecting column is located on the right side of the sliding groove in the second position.

2. The chain saw with a brake structure according to claim 1, characterized in that, The gear box is provided with a brake disc fixedly connected to a transmission shaft, the brake steel belt is sleeved outside the brake disc at the lower end and connected to the connecting plate at the upper end, and the connecting plate is rotated to make the brake steel belt contact or separate from the brake disc, so that the brake assembly is in the braking state or the unlocking state.

3. The chain saw with a brake structure according to claim 2, characterized in that, The gear box is provided with a plurality of grooves uniformly arranged in the circumferential direction, and a separation block is fixedly arranged in the groove.

4. The chain saw with a brake structure according to claim 3, characterized in that, The right end of the brake connecting rod is rotatably connected to the brake trigger, and the left end is provided with a contact pushing surface.

5. Chain saw with brake according to any of claims 2 to 4, characterized in that The switch trigger assembly comprises a switch trigger rotatably connected to the casing, the right end of the switch trigger is connected to a contact block through a transmission shaft, the contact block is rotatably connected to the casing and the gear box, the contact block is in contact with the contact pushing surface in the first position and presses the contact pushing surface downward to press the brake connecting rod, the contact block releases the contact pushing surface to release the brake connecting rod, and the contact block is separated from the contact pushing surface in the second position to release the brake connecting rod.

6. The chain saw with a brake structure according to claim 5, characterized in that, The brake connecting rod and the connecting plate are arranged in parallel, and the connecting plate is located in front of the brake connecting rod.

7. The chain saw having a brake structure according to claim 1, wherein The right end of the casing is provided with a mounting groove, the lower end of the brake trigger is movably connected to the mounting groove and slides leftward and rightward along the mounting groove, and extends into the casing to be connected to the brake connecting rod.

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