A bidirectionally mountable toothless saw

Abstract

This utility model discloses a bidirectional toothless saw, relating to the field of toothless saws. It includes a toothless saw drive body and a saw blade. A belt cover extends from the front of the drive body, and a pulley is rotatably mounted inside the belt cover. The pulley is connected to the drive body via a belt. A first shaft hole is formed through the shaft of the pulley, and hexagonal grooves are formed at both ends of the first shaft hole. A bushing is fixed to the middle of the saw blade, and hexagonal convex shafts are formed at both ends of the bushing. A second shaft hole is formed through the bushing and bushing. The hexagonal convex shafts are laterally inserted into the hexagonal grooves, aligning the first and second shaft holes. This utility model allows for convenient connection or disassembly of the saw blade and pulley by inserting the hexagonal convex shafts into the hexagonal grooves and axially locking them with bolts passing through the first and second shaft holes. The saw blade can be installed on the right or left side of the belt cover according to the working conditions to reduce the distance between the saw blade and the wall, thus expanding the cutting range.

Description

Technical Field

[0001] This utility model relates to the field of toothless saw technology, and in particular to a bidirectional toothless saw. Background Technology

[0002] Toothless saws are used in fire rescue, stone processing, engineering construction, etc. They use a gasoline engine as the driving component, and the saw blade is located in front of the driving component. The saw blade is connected to the driving component through belt drive.

[0003] Currently, in order to facilitate operation and maintain stable control, the saw blade of a toothed saw is positioned directly in front of the drive body. When the side of the drive body touches a wall or the ground, the obstruction caused by the drive body creates a large uncuttable area between the saw blade and the wall or ground, thus limiting the cutting work. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a bidirectional toothless saw that solves the problem that in current toothless saws, the saw blade is positioned directly opposite the drive body, resulting in a large uncuttable area between the saw blade and the wall or ground when the side of the drive body contacts the wall or ground.

[0005] The technical solution of this utility model is as follows: A bidirectional toothed saw includes a toothed saw drive body and a saw blade. A belt cover extends from the front of the toothed saw drive body, and a pulley is rotatably disposed inside the belt cover. The pulley is connected to the toothed saw drive body via a belt. A first shaft hole is formed through the shaft of the pulley. Hexagonal grooves are formed at both ends of the first shaft hole. A bushing is fixed in the middle of the saw blade. Hexagonal convex shafts are formed at both ends of the bushing. A second shaft hole is formed through the bushing and the bushing. The hexagonal convex shafts are laterally inserted into the hexagonal grooves to align the first shaft hole and the second shaft hole. Bolts are set through the first shaft hole and the second shaft hole to fix and lock the bushing and the pulley.

[0006] Preferably, the bolt includes a post, which is adapted to pass through a first shaft hole and a second shaft hole. One end of the post is fixed with a hexagonal end, and the other end of the post has a threaded portion, which is threaded with a nut.

[0007] Preferably, the hexagonal end adapter is fitted into a hexagonal groove on the side away from the saw blade.

[0008] Preferably, the diameter of the threaded portion is smaller than the diameter of the shaft post, and a chamfer is provided at the connection between the threaded portion and the shaft post.

[0009] Preferably, the saw blade is covered with a protective cover, which is rotatably connected to the bushing housing. Positioning posts are symmetrically fixed on both sides of the protective cover, and positioning grooves are symmetrically opened on both sides of the belt cover. When the hexagonal convex shaft is laterally inserted into the hexagonal groove, the positioning post is laterally inserted into the positioning groove.

[0010] Preferably, the hexagonal cam shaft has a converging groove on its surface, and an annular groove is formed on the inner side of the hexagonal cam shaft opposite to the converging groove. A retaining cylinder is provided in the annular groove, and a converging hole is formed on the surface of the retaining cylinder opposite to the converging groove. A steel ball is provided in the converging groove. The outer diameter of the converging groove and the diameter of the converging hole are both smaller than the diameter of the steel ball, which restricts the movement of the steel ball in the converging groove. A spherical groove is formed on the inner wall of the hexagonal groove, and the bolt abuts against the steel ball and moves outward to engage with the spherical groove.

[0011] Preferably, a plurality of steel balls are arranged around the surface of the hexagonal convex shaft, and a plurality of spherical grooves corresponding to the steel balls are arranged on the inner wall of the hexagonal groove.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model uses a hexagonal convex shaft and a hexagonal slot for insertion, and a bolt is used to axially lock the saw blade through the first shaft hole and the second shaft hole. This allows for easy connection or disassembly of the saw blade and the pulley. The saw blade can be installed on the right or left side of the belt cover according to the working conditions, which can reduce the distance between the saw blade and the wall and expand the cutting range.

[0013] 2. This utility model has a steel ball placed in the constricting groove for limiting. During the insertion of the bolt parts, the steel ball is pressed outward by the shaft column, so that the steel ball is engaged with the spherical groove, and the hexagonal cam shaft and the pulley are prevented from detaching and jamming in the axial direction, thereby improving the connection stability between the saw blade and the pulley. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the centered installation of the saw blade of this utility model.

[0015] Figure 2 This is a schematic diagram of the saw blade installed on the center side of this utility model.

[0016] Figure 3 This is a schematic diagram showing the separation of the saw blade and the pulley of this utility model.

[0017] Figure 4 This is a schematic diagram of the connection between the saw blade and the pulley of this utility model.

[0018] Figure 5 This is a schematic diagram of the steel ball assembly structure of this utility model.

[0019] Figure 6 This is a schematic diagram of the side structure of the belt cover of this utility model.

[0020] Figure 7 This is a schematic diagram of the saw blade and protective cover structure of this utility model.

[0021] Reference numerals: 1. Toothless saw drive body; 2. Belt cover; 21. Positioning groove; 3. Protective cover; 31. Positioning post; 4. Pulley; 41. First shaft hole; 42. Hexagonal groove; 43. Spherical groove; 5. Saw blade; 51. Bushing housing; 52. Hexagonal convex shaft; 53. Second shaft hole; 54. Closing groove; 55. Ring groove; 6. Shaft post; 61. Threaded part; 62. Nut; 63. Hexagonal end; 7. Steel ball; 8. Retaining sleeve; 81. Closing hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Two-way mounted toothed saw, such as Figure 1-4 As shown, the toothed saw includes a toothed saw drive body 1 and a saw blade 5. The toothed saw drive body 1 is an existing structure, which has a main housing. A gasoline engine is installed inside the main housing. A belt cover 2 is installed at the front of the main housing. Pulleys 4 are installed inside the belt cover 2 and at the rotation output part of the gasoline engine. The pulleys 4 are connected to each other by a belt, so that the gasoline engine can drive the pulleys 4 inside the belt cover 2 to rotate.

[0024] like Figure 3-5 As shown, the shaft of the pulley 4 has a first shaft hole 41 through it. At both ends of the first shaft hole 41, there are enlarged hexagonal grooves 42. The central part of the saw blade 5 is fixed to the bushing shell 51 by riveting. The bushing shell 51 has hexagonal convex shafts 52 at both ends. The hexagonal convex shafts 52 and the hexagonal grooves 42 are structurally compatible. A second shaft hole 53 is opened through the bushing shell 51. The hexagonal convex shaft 52 and the hexagonal grooves 42 are laterally inserted to align the first shaft hole 41 and the second shaft hole 53. The bolts are then passed through the first shaft hole 41 and the second shaft hole 53 to fix and lock the bushing shell 51 and the pulley 4.

[0025] The bolt includes a post 6, which is adapted to pass through the first shaft hole 41 and the second shaft hole 53. One end of the post is fixed with a hexagonal end 63, and the other end of the post has a threaded part 61, which is threaded with a nut 62.

[0026] The saw blade 5 can be installed on the left and right sides of the belt cover 2 according to the usage conditions. Under normal use, such as Figure 1 As shown, the saw blade 5 is installed on the left side of the belt cover 2, so that the saw blade 5 is located in the middle of the front of the toothless saw drive body 1, which facilitates stable operation of the saw blade 5 for cutting work. When the working environment is on the ground or in a corner, such as Figure 1 As shown, the toothless saw drive body 1 is blocked by the side wall, resulting in a large uncuttable area between the central saw blade 5 and the wall. Figure 1(In the shaded area), at this point, saw blade 5 can be disassembled and installed on the right side of belt cover 2, as shown. Figure 2 As shown, the distance between saw blade 5 and the wall is reduced to expand the cutting range.

[0027] The installation method for saw blade 5 is as follows: The hexagonal convex shaft 52 is inserted laterally into the hexagonal groove 42, locking the pulley 4 and the saw blade 5 together in the rotation direction. Then, the shaft post 6 passes through the first shaft hole 41 and the second shaft hole 53, with the hexagonal end 63 abutting against the side of the pulley 4. At the other end of the shaft post 6, the nut 62 is used to thread the threaded part 61 to lock the saw blade 5 and the pulley 4 together in the axial direction, so that the pulley 4 can drive the saw blade 5 to rotate stably.

[0028] The hexagonal end 63 and the hexagonal groove 42 are structurally compatible. When connecting the saw blade 5 and the pulley 4, the hexagonal end 63 is fitted into the hexagonal groove 42 on the side away from the saw blade 5, which makes it easy to tighten the nut 62 and the threaded part 61 at the other end, thereby improving the overall bonding strength between the bolt and the pulley 4 and the saw blade 5.

[0029] like Figure 3 , Figure 4 , Figure 6 As shown, a converging groove 54 is formed on the surface of the hexagonal cam shaft 52, and an annular groove 55 is formed on the inner side of the hexagonal cam shaft 52 opposite to the converging groove 54. A converging hole 81 is formed on the surface of the retaining cylinder 8. The steel ball 7 is placed into the converging groove 54, and then the retaining cylinder 8 is fixedly inserted into the annular groove 55 so that the converging hole 81 is directly opposite the converging groove 54. The outer diameter of the converging groove 54 and the diameter of the converging hole 81 are both smaller than the diameter of the steel ball 7, which restricts the movement of the steel ball 7 in the converging groove 54. A spherical groove 43 is formed on the inner wall of the hexagonal groove 42.

[0030] During the process of inserting the hexagonal cam shaft 52 into the hexagonal groove 42, the outer side of the steel ball 7 is resisted and retracts into the constriction groove 54. At this time, the inner side of the steel ball 7 protrudes from the constriction hole 81. When the shaft post 6 passes through the first shaft hole 41 and the second shaft hole 53, the shaft post 6 presses against the inner side of the steel ball 7, causing the steel ball 7 to move outward and be stuck into the spherical groove 43. This prevents the hexagonal cam shaft 52 from getting stuck with the pulley 4 in the axial direction, thereby improving the connection stability between the saw blade 5 and the pulley 4.

[0031] Multiple steel balls 7 can be arranged around the surface of the hexagonal convex shaft 52, and multiple spherical grooves 43 corresponding to the steel balls 7 can be arranged on the inner wall of the hexagonal groove 42 to form multiple sets of anti-disengagement joints, ensuring stable assembly and connection of the pulley 4 and the saw blade 5.

[0032] The diameter of the threaded part 61 is smaller than the diameter of the shaft post 6. A chamfer is provided at the connection between the threaded part 61 and the shaft post 6 to facilitate the shaft post 6 to press the steel ball 7 outward.

[0033] To improve the safety of operating the saw blade 5, a protective cover 3 needs to be installed on the outside of the saw blade 5. The installation method of the protective cover 3 is as follows: like Figure 3 , Figure 4 , Figure 7 As shown, the protective cover 3 is rotatably connected to the bushing housing 51 via bearings. Two sets of positioning pins 31 are symmetrically fixed on both sides of the protective cover 3. Two sets of positioning grooves 21 are symmetrically opened on both sides of the belt cover 2. During the assembly of the saw blade 5 and the belt pulley 4, when the hexagonal cam shaft 52 and the hexagonal groove 42 are laterally inserted, the positioning pins 31 are laterally inserted into the positioning grooves 21, locking the protective cover 3 and the belt cover 2 into a single unit quickly.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bidirectional toothless saw, comprising a toothless saw drive body (1) and a saw blade (5), wherein a belt cover (2) extends from the front of the toothless saw drive body (1), and a pulley (4) is rotatably disposed within the belt cover (2), the pulley (4) being connected to the toothless saw drive body (1) via a belt, characterized in that, The shaft of the pulley (4) has a first shaft hole (41) through it. The two ends of the first shaft hole (41) have hexagonal grooves (42). The middle of the saw blade (5) is fixed with a bushing shell (51). The two ends of the bushing shell (51) have hexagonal convex shafts (52). A second shaft hole (53) is opened through the bushing shell (51). The hexagonal convex shaft (52) is laterally inserted into the hexagonal groove (42) so that the first shaft hole (41) and the second shaft hole (53) are aligned. Bolts are installed through the first shaft hole (41) and the second shaft hole (53) to fix and lock the bushing shell (51) and the pulley (4).

2. The bidirectional toothless saw according to claim 1, characterized in that, The bolt includes a post (6), which is adapted to pass through the first shaft hole (41) and the second shaft hole (53). One end of the post is fixed with a hexagonal end (63), and the other end of the post has a threaded part (61), which is threaded with a nut (62).

3. The bidirectional toothless saw according to claim 2, characterized in that, The hexagonal end (63) is adapted to fit into the hexagonal groove (42) on the side away from the saw blade (5).

4. The bidirectional toothless saw according to claim 2, characterized in that, The diameter of the threaded part (61) is smaller than the diameter of the shaft (6), and a chamfer is provided at the connection between the threaded part (61) and the shaft (6).

5. The bidirectional toothless saw according to claim 1, characterized in that, The saw blade (5) is covered with a protective cover (3) on its outer side. The protective cover (3) is rotatably connected to the bushing housing (51). Positioning posts (31) are symmetrically fixed on both sides of the protective cover (3). Positioning grooves (21) are symmetrically opened on both sides of the belt cover (2). When the hexagonal convex shaft (52) is laterally inserted into the hexagonal groove (42), the positioning post (31) is laterally inserted into the positioning groove (21).

6. The bidirectional toothless saw according to claim 1, characterized in that, The hexagonal cam shaft (52) has a converging groove (54) on its surface. The inner side of the hexagonal cam shaft (52) is provided with an annular groove (55) facing the converging groove (54). A retaining cylinder (8) is provided in the annular groove (55). A converging hole (81) is provided on the surface of the retaining cylinder (8) facing the converging groove (54). A steel ball (7) is provided in the converging groove (54). The outer diameter of the converging groove (54) and the diameter of the converging hole (81) are both smaller than the diameter of the steel ball (7), which restricts the movement of the steel ball (7) in the converging groove (54). A spherical groove (43) is provided on the inner wall of the hexagonal groove (42). The bolt abuts against the steel ball (7) and moves outward to engage with the spherical groove (43).

7. The bidirectional toothless saw according to claim 6, characterized in that, Multiple steel balls (7) are arranged around the surface of the hexagonal convex shaft (52), and multiple spherical grooves (43) corresponding to the steel balls (7) are arranged on the inner wall of the hexagonal groove (42).

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