TW201924518A - Connection tube of power tool characterized by increasing friction and having light weight and abrasion resistance, thereby looseness of the connection tube can be avoided and the purpose of safety improvement can be achieved - Google Patents

Abstract

A connection tube of power tool is provided to be sleeved with a sleeve tube of power tool and is located in the sleeve tube. The connection tube of power tool is characterized in that the outer wall of the connection tube has at least one first portion and at least one second portion. The first portion is a curved surface and is located on the circumference of a first virtual circle, so that the first portion can be attached to the inner wall of the sleeve tube when the connection tube is sleeved with the sleeve tube. The second portion is an uneven structure and includes a plurality of first peak portions and first valley portions, which are arranged in parallel and disposed at intervals. Moreover, the top ends of the first peak portions do not exceed the circumference of the first virtual circle. By aforementioned design, the connection tube not only can achieve the purposes of increasing friction and having light weight, but also can have the effect of abrasion resistance. Thereby, the looseness of the connection tube can be avoided and the purpose of safety improvement can be achieved.

Description

Connecting pipe fittings for power tools

The invention relates to a connecting pipe; in particular to a connecting pipe for a power tool.

With the advancement of industrialization, the work of gardening trimming has gradually changed from manual trimming manual tools to power tools that use the engine or motor to drive the trimming device, while the gardening power tools can be roughly divided into carts and handhelds. Two different aspects, such as the hand-held power tool, because of its high maneuverability and low manufacturing cost, it is widely used in gardening trimming operations.

For example, referring to FIG. 1 , a power tool 100 for trimming trees and leaves is commonly used in the workshop, and has a connecting pipe member 110 and a switch mechanism 120 and a cutter 130 at both ends of the connecting pipe member 110 , and the switch mechanism 120 The other end is connected with a power source 140 (here, a motor is taken as an example), and a connecting shaft (not shown) connecting the power source 140 and the cutter 130 is disposed in the connecting pipe member 110, so that the user The switch mechanism 120 can be operated to open and close the power source 140 to operate and drive the blade 130 through the drive shaft to perform linear reciprocating motion, thereby achieving the purpose of trimming trees and leaves.

The design of the connecting pipe member 110 is as described in the Republic of China Patent Publication No. D169103, and the outer wall thereof has a surrounding concave and convex structure, which can increase the frictional force when the user grasps the connecting pipe member 110, so that the user can grasp the The connecting pipe member 110 is not easy to slide, and the safety at the time of taking it can be increased. In addition, the above structure can also reduce the overall weight of the connecting pipe member 110 without affecting the physical strength thereof, and can greatly reduce the burden on the user's work.

However, referring to FIG. 2 , the connecting pipe 110 is usually tightly connected to the switch mechanism 120 after being sleeved on the sleeve 120A of the switch mechanism 120 , and when the power tool 100 is actuated, the power source 140 is Depending on the operation and the influence of the transmission, the connecting pipe member 110 will generate a reciprocating vibration in a predetermined direction W1 (usually a vertical vibration in the vertical direction), so that the connecting pipe member 110 in the predetermined direction W1 and in the vicinity will be long-term. Affected by the vibration, the tip of the bump 111 of the convex-concave structure on and adjacent to the predetermined direction W1 is gradually worn, thereby causing a gap between the connecting tube member 110 in the predetermined direction and the sleeve 120A. Further, there is a safety concern that causes the connecting pipe member 110 to be loosened. Therefore, the conventional structural design of the connecting pipe member 110 is not perfect and there are still improvements.

In view of the above, the object of the present invention is to provide a connecting pipe member for a power tool, which not only achieves the purpose of increasing friction and light weight, but also has the effect of being less prone to wear, thereby avoiding loosening of the connecting pipe member and thereby improving safety. The purpose.

In order to achieve the above object, the present invention provides a connecting pipe member for a power tool for being nested in a sleeve with a sleeve of a power tool, wherein the outer wall of the connecting pipe has at least a first portion. And at least a second portion; the first portion is curved and located on a circumference of a first virtual circle, and the first portion is engageable with the inner wall of the sleeve when the connecting tube is sleeved with the sleeve The second portion is a convex-concave structure and includes a plurality of spaced apart first peaks and first valleys, and the top ends of the first peaks do not exceed the circumference of the first virtual circle. Preferably, the second portion The top end of the first peak is located on the circumference of the first virtual circle.

According to the above concept, the inner wall of the connecting pipe has at least a third portion and a fourth portion, the third portion being a curved surface and located on a circumference of a second virtual circle, the fourth portion being a convex and concave structure The second peak portion and the second valley portion are arranged in a plurality of parallel and spaced intervals, and the top ends of the second peak portions do not exceed the circumference of the second virtual circle. Preferably, the top end of the second peak portion is Located on the circumference of the second virtual circle.

According to the above concept, the third portion is located at a position corresponding to the second portion of the inner wall, and the fourth portion is located at a position corresponding to the first portion of the inner wall.

According to the above concept, the first portion has the fourth portion corresponding to the inner wall, and the second portion has the third portion corresponding to the inner wall.

According to the above concept, the circumferential circumference of the first virtual circle corresponding to the first portion accounts for 20% to 80%, preferably 50%, of the total circumference of the first virtual circle. In addition, the circumferential circumference of the first virtual circle corresponding to the second portion accounts for 80%-20% of the total circumference of the first virtual circle, preferably 50%.

According to the above concept, the circumferential circumference of the second virtual circle corresponding to the third portion accounts for 20% to 80%, preferably 50%, of the total circumference of the second virtual circle. In addition, the circumferential circumference of the second virtual circle corresponding to the fourth portion accounts for 80%-20% of the total circumference of the second virtual circle, preferably 50%.

According to the above concept, the first virtual circle portion corresponding to the first portion has a central angle of 72 degrees to 288 degrees, preferably 180 degrees. In addition, the first virtual circle portion corresponding to the second portion has a central angle of 288 degrees to 72 degrees, preferably 180 degrees.

According to the above concept, the second virtual circle portion corresponding to the third portion has a central angle of 72 degrees to 288 degrees, preferably 180 degrees. In addition, the second virtual circle portion corresponding to the fourth portion has a central angle of 288 degrees to 72 degrees, preferably 180 degrees.

According to the above concept, when the power tool is actuated, a reciprocating vibration of a predetermined direction is generated, and after the connecting pipe is sleeved with the sleeve of the power tool, the first portion is located in a predetermined direction, and the second portion is not located. In the predetermined direction.

In this way, through the above design, the connecting pipe member of the present invention not only achieves the purpose of increasing friction and light weight, but also has the effect of being less prone to wear, and can avoid the looseness of the connecting pipe member and thereby achieve the purpose of improving safety.

In order that the present invention may be more clearly described, the preferred embodiments are described in detail with reference to the drawings. Referring to FIG. 3 to FIG. 5, the connecting pipe member 10 of the preferred embodiment of the present invention is used for splicing a sleeve 20 of a power tool (not shown), and is located in the sleeve 20, and when the sleeve is When the bolt 22 on the tube 20 is tightened, the connecting tube 10 is forced and fixed in the sleeve 20. In addition, the other structures of the foregoing power tools are known in the art, and are not described herein again. Reference may be made to or use the structure of the conventional structure or other power tools as shown in FIG. 1 (for example, the model EBC is produced by Yuhe Industrial Co., Ltd.) -2401, EBC-240D, EBC-240MT, EBC-240W, APT-240, S-400, S-400JT, V-600, V-800, X-600, X-600D, X-800D, X-800W , BP-269, KT-350 or KT-430 power tool), the main focus of the invention is the structural design of the connecting pipe 10, the main features of which are as follows:

3 and FIG. 4, in the embodiment, the outer wall of the connecting pipe member 10 has two first portions 11 and two second portions 12, and the first portions 11 and the second portions 12 are connected around the connecting pipe. 10 and arranged in a spaced arrangement. Each of the first portions 11 is a smooth curved surface and is located on a circumference of a first virtual circle C1, and the second portion 12 is a convex-concave structure and includes a plurality of parallel and spaced first peak portions 121 and first The valley portion 122, and the top ends of the first peak portions 121 exhibit a design that does not exceed the circumference of the first virtual circle C1. In this embodiment, the top end of the first peak portion 121 is designed to be aligned with the circumference of the first virtual circle C1 and located on the circumference of the first virtual circle C1.

In addition, in the embodiment, the first portions 11 and the second portions 12 are equidistantly distributed on the outer wall of the connecting pipe member 10. More specifically, the first portions 11 correspond to the first portion. The circumference of the circumferential portion C1-1 on the virtual circle C1 occupies half (50%) of the total circumference of the first virtual circle C1, and the circumferential portion C1 of the first virtual circle C1 corresponding to the second portion 12 -1 week length also accounts for half (50%) of the total circumference of the first virtual circle C1. In other ways, the first portion 11 corresponds to the circumferential portion C1-1 on the first virtual circle C1, and the total angle of the central angles is 180 degrees, and the second portions 12 correspond to the first portion. The sum of the central angles of the circumferential portion C1-2 on the virtual circle C1 is also 180 degrees.

In this way, through the above structural design, the appearance of the connecting pipe member 10 also has a better friction force, so that the user does not easily slide when taking it, and the user sleeves the connecting pipe member 10 and the casing 20. The first portions 11 can be disposed at the upper and lower sides of the sleeve 20 and can be closely fitted to the inner wall of the sleeve 20, and the second portions 12 are disposed inside the sleeve 20 The left and right side positions, and the top end of the first peak portion 121 thereof can be abutted against the inner wall of the sleeve 20. Thereby, when the power tool is actuated to generate a reciprocating vibration in a predetermined direction W2 (usually a vertical vibration in the vertical ground direction), the first portions 11 will be located in the predetermined direction W2, and the arc surface of the first portion 11 is closely attached. The design of the inner wall of the sleeve 20 and the second portion 12 is not located in the predetermined direction W2 of the vibration can greatly reduce the chance of the outer wall of the connecting pipe 10 being worn, and the service life of the connecting pipe 10 can be increased and matched. The top end of the first peak portion 121 of the second portion 12 is also connected to the inner wall of the sleeve 20 to ensure that the connecting pipe member 10 does not easily fall off after being forced. It can improve the safety when used. In addition, the structural design of the second portion 12 described above can also reduce the overall weight of the connecting tube 10 without affecting its physical strength, thereby greatly reducing the burden on the user during operation.

Of course, in other embodiments, the distribution ratio of the first portion and the second portion may also be modified to achieve the same effect. For example, the circumference of the circumferential portion on the first virtual circle C1 corresponding to the first portion may be modified to be 20% to 80% of the total circumference of the first virtual circle C1 according to the use requirement, and the second portion The circumference of the circumferential portion on the first virtual circle C1 is correspondingly adjusted to be 80% to 20% of the total circumference of the first virtual circle C1, and the total length of the circumference corresponding to the first portion and the second portion is smaller than Or equal to the total circumference of the first virtual circle C1. That is, the first portion corresponds to the circumferential portion on the first virtual circle C1, and the total angle of the central angle of the circle can be modified to 72 to 288 degrees, and the second portion corresponds to the circumferential portion of the first virtual circle C1. The sum of the central angles may be adjusted to be 288 to 72 degrees, and the total of the central angles of the first portions and the circumferential portions corresponding to the second portions is less than or equal to 360 degrees.

More specifically, referring to FIG. 6, a connecting tube member 30 according to a second preferred embodiment of the present invention is different in design from the first embodiment in that the first portion 31 and the second portion 32 are not equidistant. Evenly distributed, in this embodiment, the proportion of the first portions 31 is large, and in more detail, the circumference of the circumferential portion C1-3 on the first virtual circle C1 corresponding to the first portions 31 is It occupies 2/3 of the total circumference of the first virtual circle C1, that is, the first portion 31 corresponds to the circumferential portion C1-3 on the first virtual circle, and the total angle of the central angles is about 240 degrees. In other words, the circumference of the circumferential portion C1-4 on the first virtual circle C1 corresponding to the second portion 32 in the embodiment is reduced to only 1/1 of the total circumference of the first virtual circle C1. 3, that is, the second portion corresponds to the b portion C1-4 on the first virtual circle C1, and the total angle of the central angles is only about 120 degrees, and the first portion 31 and the first portion are transmitted through the foregoing The distribution design of the two parts 32, the connecting tube 30 also has the characteristics of increasing the friction when taking, not being worn, lightweight, and structurally strong.

In addition, in order to achieve a lighter weight and reduce the user's burden of use, please refer to FIG. 7 , which is a connection tube member 40 according to a third preferred embodiment of the present invention. The design of the outer wall is the same as that of the first embodiment. Further, the difference from the foregoing embodiments is that the inner wall of the connecting pipe member 40 has two third portions 43 and two fourth portions 44 which are equally spaced and spaced apart, and each of the third portions 43 is a smooth arc. The surface is located on the circumference of a second virtual circle C2, and the fourth portion 44 is a convex-concave structure and also includes a plurality of parallel and spaced second and second valleys, and the second peaks The top end of the portion presents a design that does not exceed the circumference of the second virtual circle C2. In this embodiment, the top ends of the second peak portions are designed to be aligned with the circumference of the second virtual circle C2 and located on the circumference of the second virtual circle C2.

More specifically, the first portion 41 corresponding to the first portion 41 of the outer wall of the connecting pipe member 40 has the fourth portion 44, and the second portion 42 corresponding to the second portion 42 of the outer wall has the third portion 43. . In other words, the third portion 43 is located at a position where the inner wall corresponds to the second portion 22, and the fourth portion 44 is located at a position where the inner wall corresponds to the first portion 41. In addition, the third portions 43 and the fourth portions 44 are equidistantly distributed on the inner wall of the connecting pipe member 40, and more specifically, the second virtual circle C2 corresponding to the third portions 43 The upper circumferential circumference accounts for half (50%) of the total circumference of the second virtual circle C2, and the circumferential circumference of the second virtual circle C2 corresponding to the fourth portion 44 also occupies the second virtual The total circumference of the circle C2 is half (50%). In other ways, the third portion 43 corresponds to the portion C2-1 on the second virtual circle C2, and the total angle of the central angles is 180 degrees, and the fourth portions 44 correspond to the second portion. The sum of the central angles of the portion C2-2 on the virtual circle C2 is also 180 degrees.

In this way, through the design of the structure and position of the third portion 43 and the fourth portion 44, the weight of the connecting pipe member 40 can be greatly reduced without affecting the physical strength thereof. This makes it easier for the user to operate the power tool for related trimming operations.

Of course, in other embodiments, the ratio of the first portion to the second portion may be modified as in the foregoing embodiment, and the distribution ratios of the third portion and the fourth portion may be modified to achieve the same effect, and details are not described herein again. Finally, it should be noted that the above description is only a preferred embodiment of the present invention. For example, the virtual circles of the above embodiments are all in the form of a perfect circle, but in other implementations, the virtual circle It can also be changed to an ellipse according to the requirements of the equipment or structural design, and the equivalent changes of the specification and the scope of the patent application are intended to be included in the scope of the invention.

100‧‧‧Power Tools

110‧‧‧Connected fittings

111‧‧‧Bumps

120‧‧‧Switching mechanism

120A‧‧‧ casing

130‧‧‧Tools

140‧‧‧Power source

W1‧‧ Direction

10‧‧‧Connected fittings

11‧‧‧Part 1

12‧‧‧Part II

121‧‧‧First Peak

122‧‧‧First Valley

20‧‧‧ casing

22‧‧‧ bolt

C1‧‧‧First virtual circle

C1-1‧‧‧Circle

C1-2‧‧‧Circle

W2‧‧ Direction

30‧‧‧Connected fittings

31‧‧‧The first part

32‧‧‧Part II

C1-3‧‧‧Circle

C1-4‧‧‧Circle

40‧‧‧Connected fittings

41‧‧‧Part 1

42‧‧‧Part II

43‧‧‧Part III

44‧‧‧Part IV

C2‧‧‧Second virtual circle

C2-1‧‧‧Circle

C2-2‧‧‧Circle

Figure 1 is a perspective view of a conventional power tool. 2 is a cross-sectional view of a connecting pipe of a conventional power tool. Figure 3 is a perspective view of the connecting pipe of the power tool of the first preferred embodiment. Figure 4 is a cross-sectional view showing the connecting pipe of the power tool of the first preferred embodiment. Figure 5 is a cross-sectional view of the connecting pipe of Figure 4 in combination with a casing. Figure 6 is a cross-sectional view showing the connecting pipe of the power tool of the second preferred embodiment. Figure 7 is a cross-sectional view showing the connecting pipe of the power tool of the third preferred embodiment.

Claims (15)

A connecting pipe for a power tool for splicing with a sleeve of a power tool and located in the sleeve, wherein the outer wall of the connecting pipe has at least a first portion and at least a second portion; a portion is a curved surface and is located on a circumference of a first virtual circle, such that when the connecting tube is sleeved with the sleeve, the first portion can be attached to the inner wall of the sleeve; the second portion is a convex-concave structure The first peak portion and the first valley portion are arranged in a plurality of intervals, and the top ends of the first peak portions do not exceed the circumference of the first virtual circle. The connecting pipe of the power tool according to claim 1, wherein a top end of the first peak portion is located on a circumference of the first virtual circle. The connecting pipe of the power tool according to claim 1, wherein the inner wall has at least a third portion and at least a fourth portion, the third portion being a curved surface and located on a circumference of a second virtual circle, the first The four portions are convex and concave structures and include a plurality of parallel and spaced second peak portions and second valley portions, and the top ends of the second peak portions do not exceed the circumference of the second virtual circle. The connecting pipe of the power tool according to claim 3, wherein a top end of the second peak portion is located on a circumference of the second virtual circle. The connecting pipe of the power tool of claim 3, wherein the third portion is located at a position corresponding to the second portion of the inner wall, and the fourth portion is located at a position corresponding to the first portion of the inner wall . The connecting pipe of the power tool of claim 3, wherein the first portion has a fourth portion corresponding to the inner wall, and the second portion has the third portion corresponding to the inner wall. The connecting pipe of the power tool of claim 1, wherein the circumferential circumference of the first virtual circle corresponding to the first portion accounts for 20% to 80% of the total circumference of the first virtual circle; The circumferential circumference on the first virtual circle corresponding to the second portion accounts for 80%-20% of the total circumference of the first virtual circle. The connecting pipe of the power tool of claim 7, wherein the circumference of the first virtual circle corresponding to the first portion is 50% of the total circumference of the first virtual circle; in addition, the second The circumferential circumference on the first virtual circle corresponding to the portion is 50% of the total circumference of the first virtual circle. The connecting pipe of the power tool of claim 3, wherein the circumferential circumference of the second virtual circle corresponding to the third portion accounts for 20% to 80% of the total circumference of the second virtual circle; The circumferential circumference of the second virtual circle corresponding to the fourth portion accounts for 80%-20% of the total circumference of the second virtual circle. The connecting pipe of the power tool of claim 9, wherein the circumferential circumference of the second virtual circle corresponding to the third portion accounts for 50% of the total circumference of the second virtual circle; The circumferential circumference on the second virtual circle corresponding to the four portions is 50% of the total circumference of the second virtual circle. The connecting pipe of the power tool according to claim 1, wherein the first virtual circle portion corresponding to the first portion has a central angle of 72 degrees to 288 degrees; and the second portion corresponds to the second portion The first virtual circle portion has a central angle of 288 degrees to 72 degrees. The connection pipe of the power tool of claim 11, wherein the first virtual circle portion corresponding to the first portion has a central angle of 180 degrees; and the second portion corresponds to the first virtual The rounded part has a central angle of 180 degrees. The connection pipe of the power tool of claim 3, wherein the second virtual circle corresponding to the third portion has a central angle of 72 degrees to 288 degrees; and the fourth portion corresponds to The second virtual circle portion has a central angle of 288 degrees to 72 degrees. The connection pipe of the power tool of claim 13, wherein the second virtual circle corresponding to the third portion has a central angle of 180 degrees; and the second portion corresponds to the second The virtual circle has a central angle of 180 degrees. The connecting pipe of the power tool of claim 1, wherein the power tool generates a reciprocating vibration in a predetermined direction when the power tool is actuated, and the first part is located after the connecting pipe is sleeved with the sleeve of the power tool. In the direction, the second portion is not located in the predetermined direction.