Automatic chain tensioning device for an electric chain saw

Abstract

The present invention discloses an automatic chain tension adjusting device for an electric chain saw, which comprises a polished rod, a tension adjusting seat, a first spring, a positioning frame and a second spring. The polished rod is arranged in an installation groove of the electric chain saw housing. The tension adjusting seat is sleeved on the polished rod, and the upper end of the tension adjusting seat is fixedly embedded in a positioning hole of the chain plate. The first spring is sleeved on the polished rod, and both ends thereof are respectively in contact with the rear end face of the tension adjusting seat and the rear inner wall of the installation groove. The positioning frame is installed on the electric chain saw housing in a vertically floating manner through the second spring. Before the chain plate is installed, the upper end of the positioning frame blocks the tension adjusting seat from sliding forward on the polished rod. After the chain plate is installed on the electric chain saw housing, the positioning hole of the chain plate is sleeved on the tension adjusting seat, and the chain plate presses down the positioning frame to drive the positioning frame to disengage from the tension adjusting seat. The tension adjusting seat slides forward on the polished rod under the elastic force of the first spring to drive the chain plate to move forward, thereby automatically adjusting the tension of the chain installed on the chain plate.

Description

Technical Field:

[0001] The present invention relates to the technical field of electric chain saw products, and particularly to an automatic chain tensioning device for an electric chain saw. Background Art:

[0002] An electric chain saw is a gardening tool mainly used for logging and lumbering. Its working principle is to achieve the shearing action by the rapid movement of the blades on the saw chain. Therefore, during the use of the electric chain saw, violent vibrations will occur, and the saw chain will move at high speed during use. If the saw chain is not tensioned (i.e., the tightness of the saw chain is adjusted) before use, the saw chain may become loose or even break away from the chain plate under violent vibrations, leading to safety accidents.

[0003] Therefore, current chain saws are all provided with a tensioning adjustment structure. For example, the Chinese invention patent with the patent number ZL202220788068.0 discloses a chain saw chain that is convenient for adjusting the tightness, including a machine frame, a mounting plate, a guide plate cover and a guide plate. The mounting plate, the guide plate cover and the guide plate are mutually matched through a limiting mechanism. A second clamping groove is formed on one side of the guide plate cover, and a transmission mechanism is movably matched inside the second clamping groove. When adjusting the tightness of the chain, first move outward along the axial direction of the second clamping block in the transmission mechanism, and disengage from the second clamping groove, and still contact the second clamping block. Then, by rotating the anti-slip shaft cap, under the cooperation of the first clamping groove and the second clamping block, the worm is driven to rotate, and then the worm gear meshing with the worm is driven, so as to drive the screw rod to rotate. Then, by using the action of the slider and the limiting groove in the limiting mechanism, the guide plate is limited, so that the guide plate can only move along the direction of the screw rod, and thus the tightness adjustment of the chain is completed.

[0004] However, the above patent requires a transmission mechanism, a rotating mechanism, a worm gear, a screw sleeve, a screw rod and other mechanisms or parts to adjust the tightness of the chain. Its structure is complex and there are many parts, resulting in a high cost and inconvenient installation. In addition, it is necessary to rotate the anti-slip shaft cap to drive the worm to rotate, and then drive the worm gear meshing with the worm, so as to drive the screw rod to rotate. Then, by using the action of the slider and the limiting groove in the limiting mechanism, the guide plate is limited, so that the guide plate can only move along the direction of the screw rod, and thus the tightness adjustment of the chain is completed. Obviously, the anti-slip shaft cap is exposed outside, and it needs to be manually driven to rotate, resulting in the inability to automatically adjust the tightness of the chain. It is more cumbersome and laborious to use, not convenient enough, and the efficiency is also low, so it cannot meet the needs of the current rapidly developing industrial production.

[0005] In view of this, the inventor of the present invention proposes the following technical solutions. Summary of the Invention:

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide an automatic chain tensioning device for an electric chain saw.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: The automatic chain tensioning device for the electric chain saw includes a smooth rod, a tensioning adjustment seat, a first spring, a positioning frame, and a second spring. The smooth rod is arranged in the installation groove of the electric chain saw housing and distributed along the length direction of the chain plate. The tensioning adjustment seat is sleeved on the smooth rod and can slide on the smooth rod, and the upper end of the tensioning adjustment seat is inlaid and fixed in the positioning hole of the chain plate. The first spring is sleeved on the smooth rod. Among them, the two ends of the first spring are respectively in contact with the rear end face of the tensioning adjustment seat and the rear inner wall of the installation groove. The positioning frame is installed on the electric chain saw housing in a floating manner up and down through the second spring, and can block the tensioning adjustment seat from sliding forward on the smooth rod, and the upper end of the positioning frame protrudes into the installation groove under the elastic force of the second spring. Before the chain plate is installed, the upper end of the positioning frame protrudes into the installation groove under the elastic force of the second spring. At this time, the positioning frame blocks the tensioning adjustment seat from sliding forward on the smooth rod. When the chain plate is installed on the electric chain saw housing, the positioning hole of the chain plate is sleeved on the tensioning adjustment seat, and the chain plate will press down the positioning frame to drive the positioning frame to move downward to disengage from the tensioning adjustment seat. At this time, the tensioning adjustment seat slides forward on the smooth rod under the elastic force of the first spring to drive the chain plate to move forward, thereby automatically adjusting the tension of the chain installed on the chain plate.

[0008] Furthermore, in the above technical solution, the positioning frame is U-shaped, and a block for blocking the tensioning adjustment seat is formed in the middle of the positioning frame.

[0009] Furthermore, in the above technical solution, the block is formed with an inclined surface to facilitate the tensioning adjustment seat to cross over the positioning frame.

[0010] Furthermore, in the above technical solution, longitudinal sliding grooves are formed on the inner walls of both sides of the installation groove, and a receiving groove for receiving the second spring is arranged at the bottom of the installation groove. The second spring is installed in the receiving groove. The positioning frame is arranged in the longitudinal sliding groove, and the lower end of the positioning frame is also embedded in the upper end of the second spring.

[0011] Furthermore, in the above technical solution, a convex column is formed at the lower end of the positioning frame; the upper end of the second spring is sleeved on the convex column.

[0012] Furthermore, in the above technical solution, the tensioning adjustment seat includes a lower seat body and a cylinder integrally formed at the upper end of the lower seat body. Among them, the lower seat body is provided with a sliding hole penetrating the front and rear ends and is sleeved on the smooth rod through the sliding hole. The rear end of the lower seat body is in contact with the front end of the first spring, and the cylinder is embedded in the positioning hole of the chain plate.

[0013] Furthermore, in the above technical solution, a rib is formed on the outer shell of the electric chain saw. A driving gear is arranged at the rear side of the rib. The rear end of the chain bypasses the driving gear, and a bolt is arranged inside the outer shell of the electric chain saw and passes through the hole position on the rib and extends out of the upper end of the rib. A strip-shaped notch is arranged at the rear end of the chain plate, and the chain plate is nested around the rib through the strip-shaped notch. A cover plate and a rotatable rotary cover are arranged on the outer shell of the electric chain saw. The cover plate covers the driving gear, the rear end of the chain, and the rib and the rear end of the chain plate. A nut column is fixedly embedded in the rotary cover, and the lower end of the nut column passes through the through hole of the cover plate and is spirally installed on the bolt. The lower end of the nut column presses the upper end surface of the rear end of the chain plate to fasten the chain plate.

[0014] Furthermore, in the above technical solution, the upper end of the nut column has a hexagonal part, and the hexagonal part is fixedly embedded in the rotary cover. A ring groove is arranged at the lower end of the nut column, and a snap ring is clamped in the ring groove. The snap ring presses against the upper end of the rear end of the chain plate.

[0015] Furthermore, in the above technical solution, a limiting circular groove is formed at the upper end of the cover plate. The rotary cover is placed in the limiting circular groove, and a plurality of helical teeth are formed on the lower end surface of the rotary cover. The helical teeth are in contact with the bottom of the limiting circular groove.

[0016] Furthermore, in the above technical solution, an arc arrow mark, a locking mark and an unlocking mark located at both ends of the arc arrow mark are also arranged on the cover plate.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: Before installing the chain plate, the upper end of the positioning frame protrudes into the installation groove under the elastic force of the second spring. At this time, the positioning frame blocks the forward sliding of the tension adjusting seat on the smooth rod, that is, the positioning frame can play a role in positioning the tension adjusting seat, which is convenient for the subsequent installation of the chain plate. When the chain plate is installed on the outer shell of the electric chain saw, the positioning hole of the chain plate is sleeved on the tension adjusting seat, and the chain plate will contact the positioning frame. When the chain plate is pressed down, the positioning frame will also be pressed down. When the positioning frame is pressed down, it will drive the positioning frame to move downward until the positioning frame disengages from the tension adjusting seat. At this time, the tension adjusting seat slides forward on the smooth rod under the elastic force of the first spring to drive the chain plate to move forward, thereby automatically adjusting the tension of the chain installed on the chain plate. That is to say, the present invention can automatically adjust the tension of the chain installed on the chain plate, with simple operation, labor saving, high efficiency, and extremely convenient to use, so that it can meet the needs of the current rapidly developing industrial production, making the present invention have extremely strong market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS:

[0018] Figure 1 is a three-dimensional view of an electric chain saw equipped with the present invention;

[0019] Figure 2 Is an exploded perspective view of the electric chain saw equipped with the present invention;

[0020] Figure 3 Is a perspective view of the electric chain saw equipped with the present invention after removing the rotating cover and the cover plate;

[0021] Figure 4 Is an assembly structure diagram of the present invention;

[0022] Figure 5 Is a perspective view of the present invention;

[0023] Figure 6 Is an assembly drawing of the present invention and the electric chain saw housing;

[0024] Figure 7 Is a perspective view of another angle of the present invention;

[0025] Figure 8 Is an assembly drawing of the present invention and the chain plate. Specific embodiments:

[0026] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0027] See Figure 1-8 As shown, it is an electric chain saw provided with a chain automatic tensioning device. The chain automatic tensioning device includes a smooth rod 1, a tensioning adjustment seat 2, a first spring 3, a positioning frame 4, and a second spring 5.

[0028] The polished rod 1 is arranged in the installation groove 61 of the electric chain saw housing 6 and distributed along the length direction of the chain plate 7. The tension adjusting seat 2 is sleeved on the polished rod 1 and can slide on the polished rod 1. The upper end of the tension adjusting seat 2 is fixedly embedded in the positioning hole 70 of the chain plate 7. The first spring 3 is sleeved on the polished rod 1. Among them, the two ends of the first spring 3 are respectively in contact with the rear end face of the tension adjusting seat 2 and the rear inner wall of the installation groove 61. The positioning frame 4 is installed on the electric chain saw housing 6 in a floating up and down manner through the second spring 5, and can block the tension adjusting seat 2 from sliding forward on the polished rod 1. The upper end of the positioning frame 4 protrudes into the installation groove 61 under the elastic force of the second spring 5. Before the chain plate 7 is installed, the upper end of the positioning frame 4 protrudes into the installation groove 61 under the elastic force of the second spring 5. At this time, the positioning frame 4 blocks the tension adjusting seat 2 from sliding forward on the polished rod 1. When the chain plate 7 is installed on the electric chain saw housing 6, the positioning hole 70 of the chain plate 7 is sleeved on the tension adjusting seat 2, and the chain plate 7 will press down the positioning frame 4 to drive the positioning frame 4 to move downward to disengage from the tension adjusting seat 2. At this time, the tension adjusting seat 2 slides forward on the polished rod 1 under the elastic force of the first spring 3 to drive the chain plate 7 to move forward, thereby automatically adjusting the tension of the chain 8 installed on the chain plate 7. That is to say, the present invention can automatically adjust the tension of the chain 8 installed on the chain plate 7, with simple operation, labor saving, high efficiency, and extremely convenient to use, so that it cannot meet the needs of the current rapidly developing industrial production, making the present invention have extremely strong market competitiveness.

[0029] The positioning frame 4 is U-shaped, and a block 41 for blocking the tension adjusting seat 2 is formed in the middle of the positioning frame 4. Among them, the upper part of the positioning frame 4 also wraps around the periphery of the polished rod 1 for later blocking the tension adjusting seat 2 to achieve the positioning of the tension adjusting seat 2. The block 41 can well block the tension adjusting seat 2 and stably block the tension adjusting seat 2 under the action of the second spring 5.

[0030] The block 41 is formed with an inclined surface 411 for facilitating the tension adjusting seat 2 to cross over the positioning frame 4. The function of the inclined surface 411 is that after the positioning frame 4 is pressed down, the second spring 5 is compressed. At this time, the block 41 will also be relative to the tension adjusting seat 2. Since the block 41 is formed with the inclined surface 411, it can cross over the block 41 more quickly to achieve the purpose of unlocking (that is, the relative disengagement of the tension adjusting seat 2 and the positioning frame 4).

[0031] The assembly structure of the positioning frame 4, the second spring 5 and the electric chain saw housing 6 is as follows: Longitudinal chutes 62 are formed on the inner walls on both sides of the installation groove 61, and a receiving groove 63 for receiving the second spring 5 is provided at the bottom of the installation groove 61. The second spring 5 is installed in the receiving groove 63. The positioning frame 4 is arranged in the longitudinal chute 62, and the lower end of the positioning frame 4 is also embedded in the upper end of the second spring 5, which ensures the stability of the assembly structure of the positioning frame 4, the second spring 5 and the electric chain saw housing 6.

[0032] A convex column 42 is formed at the lower end of the positioning frame 4; The upper end of the second spring 5 is sleeved on the convex column 42, so that the upper end of the second spring 5 is stably assembled with the lower end of the positioning frame 4, preventing accidental detachment, and thus avoiding the situation that the second spring 5 cannot stably provide elastic force to the positioning frame 4.

[0033] The tension adjustment seat 2 includes a lower seat body 21 and a cylinder 22 integrally formed at the upper end of the lower seat body 21. Among them, the lower seat body 21 is provided with a sliding hole 211 penetrating the front and rear ends, and is sleeved on the optical rod 1 through the sliding hole 211, ensuring the stability of the assembly of the lower seat body 21 and the optical rod 1 and enabling stable relative sliding. And the rear end of the lower seat body 21 contacts the front end of the first spring 3, and the cylinder 22 is embedded in the positioning hole 70 of the link plate 7, so that the tension adjustment seat 2 and the link plate 7 are stably assembled.

[0034] A convex strip 64 is formed on the electric chain saw housing 6. A driving gear 91 is arranged at the rear side of the convex strip 64. The rear end of the chain 8 bypasses the driving gear 91. And a bolt 65 is arranged inside the electric chain saw housing 6, passing through the hole position 641 on the convex strip 64 and extending out of the upper end of the convex strip 64; A strip-shaped notch 71 is arranged at the rear end of the link plate 7, and the link plate 7 is nested outside the convex strip 64 through the strip-shaped notch 71, achieving the positioning function and ensuring the stability of the assembly structure of the link plate 7.

[0035] A cover plate 92 and a rotatable rotary cover 93 are arranged on the electric chain saw housing 6. The cover plate 92 covers the driving gear 91, the rear end of the chain 8, the convex strip 64 and the rear end of the link plate 7, playing a protective role and also a decorative role; A nut column 94 is fixedly embedded in the rotary cover 93, and the lower end of the nut column 94 passes through the through hole 921 of the cover plate 92 and is screwed on the bolt 65. And the lower end of the nut column 94 presses on the upper end surface of the rear end of the link plate 7 to fasten the link plate 7. Its assembly structure is simple and stable, and is also convenient for disassembly and assembly, facilitating maintenance.

[0036] The upper end of the nut column 94 has a hexagonal part 941, and the hexagonal part 941 is fixedly embedded in the rotary cover 93; A ring groove 942 is arranged at the lower end of the nut column 94, and a snap ring 943 is clamped in the ring groove 942, and the snap ring 943 presses against the upper end of the rear end of the link plate 7.

[0037] A limiting circular groove 920 is formed at the upper end of the cover plate 92. The rotary cover 93 is placed in the limiting circular groove 920. A plurality of helical teeth 931 are formed on the lower end surface of the rotary cover 93. The helical teeth 931 are in contact with the bottom of the limiting circular groove 920. After tightening, the helical teeth 931 play a locking role to ensure that the rotary cover 93 is stably assembled in the limiting circular groove 920 and prevent the rotary cover 93 from accidentally loosening.

[0038] An arc arrow mark 922, a locking mark 923 and an unlocking mark 924 located at both ends of the arc arrow mark 922 are further provided on the cover plate 92. They play a good marking role and are convenient for operation.

[0039] In summary, before installing the chain plate 7 of the present invention, the upper end of the positioning frame 4 protrudes into the installation groove 61 under the elastic force of the second spring 5. At this time, the positioning frame 4 blocks the forward sliding of the tension adjustment seat 2 on the optical rod 1, that is, the positioning frame 4 can play a role in positioning the tension adjustment seat 2, which is convenient for the subsequent installation of the chain plate 7; when the chain plate 7 is installed on the electric chain saw housing 6, the positioning hole 70 of the chain plate 7 is sleeved on the tension adjustment seat 2, and when the chain plate 7 contacts the positioning frame 4 and presses down the chain plate 7, the positioning frame 4 will also be pressed down. When the positioning frame 4 is pressed down, it will drive the positioning frame 4 to move downward until the positioning frame 4 disengages from the tension adjustment seat 2. At this time, the tension adjustment seat 2 slides forward on the optical rod 1 under the elastic force of the first spring 3 to drive the chain plate 7 to move forward, thereby automatically adjusting the tension of the chain 8 installed on the chain plate 7. That is to say, the present invention can automatically adjust the tension of the chain 8 installed on the chain plate 7. Its operation is simple, labor-saving, highly efficient, and extremely convenient to use, so that it cannot meet the needs of the current rapidly developing industrial production, making the present invention have extremely strong market competitiveness.

[0040] Certainly, the above are only specific embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention shall be included in the scope of the patent application of the present invention.

Claims

1. An automatic chain tensioning device for an electric chain saw, characterized in that: It includes a polished rod (1), a tension adjusting seat (2), a first spring (3), a positioning frame (4) and a second spring (5). The polished rod (1) is arranged in the installation groove (61) of the electric chain saw housing (6) and distributed along the length direction of the chain plate (7). The tension adjusting seat (2) is sleeved on the polished rod (1) and can slide on the polished rod (1). The upper end of the tension adjusting seat (2) is inlaid and fixed in the positioning hole (70) of the chain plate (7). The first spring (3) is sleeved on the polished rod (1). Among them, the two ends of the first spring (3) are respectively in contact with the rear end face of the tension adjusting seat (2) and the rear inner wall of the installation groove (61). The positioning frame (4) is installed on the electric chain saw housing (6) in a floating up and down manner through the second spring (5), and can block the tension adjusting seat (2) from sliding forward on the polished rod (1). The upper end of the positioning frame (4) protrudes into the installation groove (61) under the elastic force of the second spring (5). Before the chain plate (7) is installed, the upper end of the positioning frame (4) protrudes into the installation groove (61) under the elastic force of the second spring (5). At this time, the positioning frame (4) blocks the tension adjusting seat (2) from sliding forward on the polished rod (1). When the chain plate (7) is installed on the electric chain saw housing (6), the positioning hole (70) of the chain plate (7) is sleeved on the tension adjusting seat (2), and the chain plate (7) will press down the positioning frame (4) to drive the positioning frame (4) to move downward to disengage from the tension adjusting seat (2). At this time, the tension adjusting seat (2) slides forward on the polished rod (1) under the elastic force of the first spring (3) to drive the chain plate (7) to move forward, thereby automatically adjusting the tension of the chain (8) installed on the chain plate (7); The tension adjusting seat (2) includes a lower seat body (21) and a cylinder (22) integrally formed at the upper end of the lower seat body (21); a rib (64) is formed on the electric chain saw housing (6).

2. The automatic chain tensioning device for an electric chain saw according to claim 1, characterized in that: The positioning frame (4) is U-shaped, and a blocking block (41) for blocking the tension adjusting seat (2) is formed in the middle of the positioning frame (4).

3. The automatic chain tensioning device for an electric chain saw according to claim 2, characterized in that: The blocking block (41) is formed with an inclined surface (411) for facilitating the tension adjusting seat (2) to cross over the positioning frame (4).

4. The automatic chain tensioning device for an electric chain saw according to claim 3, characterized in that: Longitudinal sliding grooves (62) are formed on the inner walls of both sides of the installation groove (61), and a receiving groove (63) for receiving the second spring (5) is arranged at the bottom of the installation groove (61). The second spring (5) is installed in the receiving groove (63). The positioning frame (4) is arranged in the longitudinal sliding groove (62), and the lower end of the positioning frame (4) is also embedded in the upper end of the second spring (5).

5. The automatic chain tensioning device for an electric chain saw according to claim 3, characterized in that: A convex column (42) is formed at the lower end of the positioning frame (4); the upper end of the second spring (5) is sleeved on the convex column (42).

6. The automatic chain tensioning device for an electric chain saw according to any one of claims 1-5, characterized in that: The lower seat body (21) is provided with a sliding hole (211) penetrating the front and rear ends, and is sleeved on the polished rod (1) through the sliding hole (211). The rear end of the lower seat body (21) is in contact with the front end of the first spring (3), and the cylinder (22) is embedded in the positioning hole (70) of the chain plate (7).

7. The automatic chain tensioning device for an electric chain saw according to any one of claims 1-5, characterized in that: A drive gear (91) is provided at the rear side of the rib (64). The rear end of the chain (8) bypasses the drive gear (91), and a bolt (65) is provided inside the housing (6) of the electric chain saw, passing through a hole (641) on the rib (64) and extending outside the upper end of the rib (64). A strip-shaped notch (71) is provided at the rear end of the chain plate (7), and the chain plate (7) is nested around the rib (64) through the strip-shaped notch (71). A cover plate (92) and a rotatable rotary cover (93) are provided on the housing (6) of the electric chain saw. The cover plate (92) covers the drive gear (91), the rear end of the chain (8), and the rear ends of the rib (64) and the chain plate (7). A nut column (94) is fixedly embedded in the rotary cover (93), and the lower end of the nut column (94) passes through a through hole (921) of the cover plate (92) and is screwed onto the bolt (65). The lower end of the nut column (94) presses against the upper end surface of the rear end of the chain plate (7) to fasten the chain plate (7).

8. The automatic chain tensioning device for an electric chain saw according to claim 7, characterized in that: The upper end of the nut column (94) has a hexagonal portion (941), which is fixedly embedded in the rotary cover (93). A ring groove (942) is provided at the lower end of the nut column (94), and a snap ring (943) is clamped in the ring groove (942). The snap ring (943) presses against the upper end of the rear end of the chain plate (7).

9. The automatic chain tensioning device for an electric chain saw according to claim 7, characterized in that: A limiting circular groove (920) is formed at the upper end of the cover plate (92). The rotary cover (93) is placed in the limiting circular groove (920), and a plurality of helical teeth (931) are formed on the lower end surface of the rotary cover (93). The helical teeth (931) are in contact with the bottom of the limiting circular groove (920).

10. The automatic chain tensioning device for an electric chain saw according to claim 9, characterized in that: An arc arrow mark (922) and a locking mark (923) and an unlocking mark (924) located at both ends of the arc arrow mark (922) are further provided on the cover plate (92).

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