TWI715519B - Cutting tool change structure - Google Patents

Abstract

A tool changing structure includes a tool box, two balls and a rod. The knife case includes: a chamber is formed inside the knife case; an entrance is on one side of the knife case, which enters a straight hole of the knife case through the chamber to the opposite side; two straight holes are inserted into the knife case in parallel to form a container On the wall of the chamber, the center of at least one straight hole intersects the straight hole perpendicularly. These balls are placed in the chamber of the knife box, and the two sides of the ball are limited by the corresponding straight holes, so that the local balls are exposed in the chamber and can reciprocate in the knife box along the length direction of the straight holes. The rod passes through the straight hole and enters and exits the straight hole through the chamber of the knife box, and the two balls are separated by the rod entering the straight hole as normal. The tool change structure is configured on a blade handle of a scissors. The blade handle covers the blade change structure, which neither affects the interaction between the ball and the rod, nor does it cover the entrance and exit. The blade change structure can be used to install a blade or perform the elimination. Change to a new tool change operation.

Description

Cutting tool change structure

The invention relates to the field of tool change of shears, in particular to a tool change structure suitable for a water pipe cutter.

As shown in FIG. 8, the known pipe cutter 80 includes a handle 84 and a blade handle 90. The shank 84 and a tool holder 85 are integrally formed, and a pivot hole 91 is formed at a position where the shank 84 is adjacent to the tool holder 85. A shaft 81 passes through the handle 84 and the blade handle 90 partially inserted into the pivot hole 91, with the shaft 81 as the center, the handle 84 and the blade handle 90 reciprocate in an open position and a shear position. Specifically, the shaft 81 is composed of a screw cylinder 83 locking a stud 82.

In the open position, the shank 84 and the shank 90 are separated to an angle, and the shank 90 operates a blade 87 to leave a slit 86 of the knife seat 85. At this moment, the knife seat 85 of the water pipe cutter 80 can be close to a water pipe (not shown). In the cutting position, the handle 84 and the knife handle 90 are close to each other, and the knife handle 90 operates a knife edge 88 of the blade 87 to intersect the slit 86 of the knife holder 85 to cut a water pipe of a certain length.

Figure 9 is a three-dimensional view showing a water pipe cutter 80 partially cut away. Among them, the blade 87 has an exposed end 89 and a joint end 92, and the joint end 92 penetrates into the shank 90 so that the shank 90 receives the position of the blade 87 close to the joint end 92. At the same time, the shaft 81 passes through a hole 93 of the blade 87.

When changing the knife, the shaft 81 is removed into a stud 82 and a screw cylinder 83. The blade handle 90 and the blade 87 leave the pivot hole 91 of the handle 84, and the old blade 87 is drawn out from the blade handle 90.

When assembled, the joint end 92 of the new blade 87 penetrates into the shank 90, and the shank 90 together with the new blade 87 passes through the pivot hole 91 of the shank 84. The screw cylinder 83 locks the stud 82 to become the shaft 81, and the shaft 81 passes The handle 84, the blade handle 90 and the hole 93 of the new blade 87 complete the tool change operation of the water pipe cutter 80.

Because the screw cylinder 83 not only passes through the handle 84, the blade handle 90, and the hole 93 of the new blade 87, but also aligns with the stud 82 to be locked, so the tool change operation is quite complicated, and improvement is necessary.

In view of this, the inventor of the present case proposes a tool-changing structure, which is suitable for cutting tools for cutting water pipes. The main purpose is: the use of a catch structure, without the need to remove the shaft, can perform tool-changing operations on the cutting tool, achieving easy replacement , Save time and other effects.

From the achievement of the above objective, the tool change structure of the present invention includes:

A knife case includes: a chamber formed inside the knife case; an entrance and exit on one side of the knife case, which enters a straight hole of the knife case through the chamber to the opposite side; two straight holes sink into the knife case in parallel to form a container On the wall of the chamber, the center of at least one straight hole intersects the straight hole perpendicularly;

Two balls are placed in the chamber of the knife box. The two sides of the ball are limited by the corresponding straight holes, so that the partial balls are exposed in the chamber and can reciprocate in the knife box along the length of the straight holes; and

One rod passes through the straight hole, enters and exits the straight hole through the chamber of the knife box, and the two balls are separated by the straight hole as normal.

Wherein, the tool change structure replaces a blade, the blade has an exposed end and a joint end, the joint end extends in the direction of the exposed end through a long hole of the blade, one end of the long hole becomes an opening through the joint end, and the other end It is closed, and two latches with openings facing each other are formed on the wall surface of the long hole around the blade.

When the joint end enters the chamber of the knife box through the entrance and exit, the rod exits the straight hole, and the two balls pass through the opening of the long hole together along the length of the straight hole until the catch is located between the two straight holes. When the long hole receives the rod, the rod enters the straight hole and separates the two balls. The ball jams the wall surface and the catch part of the straight hole, which can prevent the blade from being pulled out of the chamber of the knife box.

In addition, under the condition of not affecting the interaction between the ball and the rod, a blade handle covers the tool change structure but does not cover the entrance and exit. A shank and a tool seat are designed as a whole, and a pivot hole of the shank is adjacent to the tool seat, allowing the blade handle to wrap the part of the tool change structure to be placed in the pivot hole. A shaft passes through the handle, the blade handle, the chamber of the knife case and the long hole of the blade, with the shaft as the center, and one blade of the blade is staggered by a slit of the blade seat to form a scissors.

In the scissors provided with the knife changing structure of the present invention, the knife case is composed of a combined main body and a cover plate. The side of the main body sinks into a groove, and the wall of the groove facing the cover plate sinks into a straight hole. One side of the straight hole is a central hole penetrating the main body, and the other side is a semicircular groove sinking into the surface of the main body. The side of the cover plate is also provided with a central hole, the central hole is connected to a semicircular groove sinking into the side of the cover plate, and the semicircular groove perpendicularly intersects the straight hole of the cover plate.

During the merging, the groove is closed by the cover plate and becomes a chamber inside the knife box, restricting the two straight holes to be parallel to each other and the distance between each other is greater than the diameter of the ball. At the same time, the two semicircular grooves are merged into a straight hole, and the straight hole leads to the entrance and exit on the opposite side of the knife box through the chamber.

In addition, the end defining the rod inserted into the chamber is the inner end, the end of the rod exposing the knife case is regarded as the outer end, and between the outer end and the inner end are two flanges protruding from the outer surface of the rod. A switch is provided with a toggle part, the toggle part is inserted between two flanges, and the switch drives the toggle part to drive the flange to move along the axis of the rod.

Among them, one end of an arm is connected with the knife case, and the other end is bent into a bent part. The bent part has a column, and the column is opposite to the outer end of the rod. A compression spring covers the rod and the column. One end of the compression spring abuts the bent part and the other end is against the flange, providing a force required for the rod to be inserted into the chamber until the other flange is blocked by the knife box.

In terms of detailed structure, the shaft is composed of a screw barrel and a stud. Secondly, a fastener passes through a fisheye hole of the main body and is locked into a screw hole of the cover plate, and the fastener makes the main body and the cover plate together. Furthermore, the inner end of the rod is a cone.

In this way, the knife change structure of the present invention is suitable for cutting tools for cutting water pipes. A rod is used to separate two balls. The ball cooperates with the wall of the straight hole to block the clamping part of the blade. The cutting tool can be used without removing the shaft. Tool change operation achieves the effects of easy replacement and time saving.

In order to make the purpose, features and advantages of the present invention simple and understandable, one or more preferred embodiments are described in detail as follows with the accompanying drawings.

Figure 1 is a perspective view showing a preferred embodiment of the tool change structure 10, which can be broken down into a main body 20, a cover 30, two balls 40, a compression spring 41, a rod 42 and a switch 50. Group) pieces.

The side of the main body 20 sinks into a groove 22, and the wall surface of the main body 20 surrounding the groove 22 sinks into a straight hole 25. One side of the straight hole 25 is a central hole 24 that penetrates the main body 20, and the other is into the main body 20. A semicircular groove 23 on the surface. From Figure 1, there is a height difference between the top surface of the main body 20 and the bottom surface of the groove 22, so that the central hole 24, the straight cavity 25 and the semicircular groove 23 are not directly connected together. One end of an arm 26 is designed to be integral with the main body 20, and the other end is bent into a bent portion 27, and the bent portion 27 extends a post 28 toward the semicircular groove 23.

There is also a central hole 33 on the side of the cover plate 30. The central hole 33 is connected to a semicircular groove 32. The semicircular groove 32 perpendicularly intersects with a straight cavity 34. The straight cavity 34, the semicircular groove 32 and the central hole 33 are all trapped in the cover plate. 30 on the same side.

In this embodiment, the functional shapes of the main body 20 and the cover plate 30 are inconsistent, and through a locking means, the two are combined into a knife case. The locking means generally refers to a fastener 15 like a bolt that passes through a fisheye hole 21 of the main body 20 and locks into a screw hole 31 of the cover plate 30 so that the main body 20 can be detachably combined with the cover plate 30.

In some embodiments, the knife case is formed by combining two bodies 20 with the same shape and opposite directions, so that they cannot be easily separated. For example, the hot melt technology replaces the locking structure and melts the peripheries of the two main bodies 20 together to form the same knife case.

As shown in FIGS. 1 and 2, during the merging period, the groove 22 is closed by the cover plate 30 and becomes the chamber 12 inside the knife magazine 11. Therefore, the two straight holes 25 and 34 sink in parallel to the wall surface of the chamber 12 enclosed by the knife box 11, that is, the bottom surface of the groove 22 and the side surface of the cover plate 30. At the same time, the two semi-circular grooves 23 and 32 are merged into a straight hole 14, and the straight hole 14 passes through the chamber 12 to the entrance and exit 13 on the opposite side of the knife cartridge 11.

From the fourth and fifth figures, the chamber 12 of the knife box 11 receives two balls 40. Because the diameter of the ball 40 is smaller than the distance between the two straight holes 25 and 34, but greater than the distance from the bottom surface of the groove 22 to the side surface of the cover plate 30, the two sides of the ball 40 are restricted by the straight holes 25 and 34, so that part of the ball 40 ( Usually the middle part) exposes the chamber 12 and can reciprocate along the length direction of the straight holes 25 and 34 in the knife box 11.

In FIG. 6, the rod 42 passes through the straight hole 14 and enters and exits the straight hole 34 through the chamber 12 of the knife cartridge 11. At the same time, the two balls 40 are separated by the rod 42 entering the straight hole 34 as normal. Specifically, one end of the defining rod 42 inserted into the chamber 12 is an inner end 44, and the inner end 44 is a cone. The end of the rod 42 exposing the knife holder 11 is regarded as the outer end 43, and the outer end 43 is opposite to the column 28 and provides the distance required for the rod 42 to enter and exit the straight cavity 34. In addition, the two flanges 45 and 46 protrude from the outer surface of the rod 42 and are located between the outer end 43 and the inner end 44.

The compression spring 41 covers the rod 42 and the post 28, and the post 28 and the rod 42 prevent the compression spring 41 from springing away from the cartridge 11. One end of the compression spring 41 is against the bent portion 27, and the other end is against the flange 45 to provide a force required for the rod 42 to be inserted into the chamber 12 until the other flange 46 is blocked by the outer surface of the knife cartridge 11. It is normal for the rod 42 to enter the straight hole 34.

The switch 50 is provided with a toggle portion 51. The toggle portion 51 is a U-shaped body. The U-shaped body stands on the bottom surface of the switch 50 and can be inserted between the two flanges 45 and 46. In the figure, the switch 50 protrudes from a convex portion 52, and the convex portion 52 makes the top surface of the switch 50 an undulating force-receiving surface for receiving force.

Therefore, in the direction of arrow A (see Figure 4), the switch 50 drives the toggle portion 51 to drive the flange 45 to move. The flange 45 is close to the bent portion 27 to deform the compression spring 41 and shorten the outer portion of the rod 42. The distance from end 43 to column 28. Or along the direction of arrow C, the compression spring 41 returns to its original shape and pushes the flange 45 and the outer end 43 of the rod 42 away from the column 28 until the flange 46 abuts the outer surface of the cartridge 11. At this moment, the inner end 44 of the rod 42 enters the straight hole 34 and separates the two balls 40, and the flange 45 forces the toggle portion 51 to cause the switch 50 to move in the same direction. In other words, the switch 50 drives the toggle portion 51 to drive the flange 45 to move back and forth along the axis of the rod 42.

Looking back to Figures 4 and 5, in order to achieve the effect of replacement, a blade 66 is assembled in the tool changing structure 10. Similar to the traditional structure, the blade 66 has an exposed end 68 and a joint end 69, and a cutting edge 67 is formed on one side of the blade 66 from the exposed end 68 to the joint end 69.

The difference is that both sides of the blade 66 are penetrated by a long hole 70. The long hole 70 extends from the coupling end 69 to the exposed end 68, one end of which becomes an opening 71 through the coupling end 69, and the other end is closed. In addition, the blade 66 is trapped in two latching portions 72 around the wall surface of the long hole 70. The latching portions 72 are semi-circular grooves, and the openings of these semi-circular grooves face each other. Therefore, these latching parts 72 are on both side walls of the blade 66 surrounding the long hole 70.

On the premise that the rod 42 exits the straight holes 25 and 34, in the direction of arrow B (see FIG. 4), the joint end 69 of the blade 66 enters the chamber 12 of the knife cartridge 11 through the entrance 13. Once the ball 40 falls into the opening 71 of the long hole 70, the blade 66 surrounds the wall of the long hole 70 to force the two balls 40 to move closer to the center of the straight hole 34. Losing the blocking effect of the ball 40, the joint end 69 of the blade 66 moves toward the depth of the groove 22 unimpededly, causing the latch 72 to come between the two straight holes 25 and 34.

On the contrary, the two balls 40 in the center of the straight hole 34 have no resistance and cannot prevent the blade 66 from moving in the direction of arrow D (see Fig. 4) until the joint end 69 leaves the chamber 12 of the knife cartridge 11 through the entrance and exit 13, complete The pre-work of tool change is "knife drawing".

Then see Figures 6 and 7, when the long hole 70 receives the rod 42 (or the rod 42 is inserted into the long hole 70), the inner end 44 of the rod 42 enters the straight holes 25 and 34, and then separates (or pushes apart) the two 40 balls. The thickness of the blade 66 is equivalent to the distance from the bottom surface of the groove 22 to the side surface of the cover plate 30, which just fills the inner space of the knife box 11 equivalent to the chamber 12, so the ball 40 clamps the wall surfaces of the straight holes 25 and 34 and the latch 72 , Which can prevent the blade 66 from being pulled out of the chamber 12 of the tool changing structure 10.

According to Figures 3, 4, and 6, it is not difficult to understand that the tool changing structure 10 and the blade 66 are components of a scissors 60. The components constituting the scissors 60 also include a shaft 61, a handle 62 and a blade handle 63. Under the condition of not affecting the interaction between the ball 40 and the rod 42 (even the compression spring 41), the blade handle 63 covers the tool changing structure 10, but does not cover the entrance and exit 13. The shank 62 is designed as a whole with a tool holder 64. A pivot hole 75 of the shank 62 is adjacent to the tool holder 64, allowing the blade handle 63 to wrap the part of the tool changing structure 10 to be placed in the pivot hole 75.

Although the shaft 61 is similar to the prior art, it is also composed of a screw cylinder 73 locking a stud 74. The shaft 61 passes through the handle 62, the blade handle 63, the chamber 12 (that is, the central holes 24, 33 of the main body 20 and the cover 30) of the knife holder 11, and the long hole 70 of the blade 66. The blade 66 is centered on the shaft 61. The blade 67 of the 66 crosses a slit 65 of the blade seat 64 to cut a water pipe of a certain length.

The difference is that the shaft 61 need not be disassembled during the tool change operation. Simply put, the handle 62 and the blade handle 63 swing outward to an angle, which drives the knife holder 64 and the blade 66 to expand to a corresponding angle. A user (not shown in the figure) operates the switch 50 to drive the rod 42 to move and release the jamming relationship between the ball 40 and the blade 66, and the old blade 66 can be easily taken out. The new blade 66 enters the chamber 12 of the knife cartridge 11 through the entrance and exit 13, releases the switch 50, the compression spring 41 pushes the rod 42 into the vertical holes 25, 34, and separates the two balls 40 to clamp the catch 72 of the blade 66 again. , Easy to complete the tool change operation.

In addition, the handle 62 and the blade handle 63 are close together, and the handle 62 protects the switch 50 from accidental touch by external force.

"Prior Art" 80: pipe cutter 81: axis 82: Stud 83: screw barrel 84: handle 85: knife holder 86: slit 87: Blade 88: Blade 89: Exposed 90: blade handle 91: pivot hole 92: binding end 93: Hole "this invention" 10: Tool change structure 11: knife case 12: Room 13: entrance and exit 14: straight hole 15: Fastener 20: main body 21: Fisheye 22: Groove 23, 32: semicircular groove 24, 33: Center hole 25, 34: straight point 26: arm 27: Bending part 28: Column 30: cover 31: screw hole 40: Ball 41: Compression spring 42: Rod 43: outer end 44: inner end 45, 46: flange 50: switch 51: Toggle part 52: Convex 60: Scissors 61: Axis 62: handle 63: blade handle 64: knife holder 65: slit 66: Blade 67: Blade 68: Exposed 69: binding end 70: Long hole 71: open 72: Card Control Department 73: screw barrel 74: Stud 75: pivot hole A, B, C, D: arrow

Figure 1 depicts the tool change structure of the present invention after decomposition. Figure 2 shows the tool change structure after combination. Figure 3 shows a preferred embodiment of a scissors with a tool change structure. Figure 4 plots the movement of the tool change. Figure 5 shows that the ball of Figure 4 moves relative to the cassette. Figure 6 shows the structure after tool change. Fig. 7 depicts the connection relationship of Fig. 6 with the ball stuck to the blade. Figures 8 and 9 show the partial structure of the prior art water pipe cutter and the internal section.

10: Tool change structure

11: knife case

12: Room

13: entrance and exit

14: straight hole

15: Fastener

20: main body

21: Fisheye

24: Center hole

26: arm

27: Bending part

28: Column

30: cover

41: Compression spring

42: Rod

45, 46: flange

50: switch

51: Toggle part

52: Convex

Claims (9)

A cutting tool changing structure includes: A knife cassette (11) includes: a chamber (12) formed inside the knife cassette (11); an entrance (13) on one side of the knife cassette (11), which enters the knife cassette (11) through the chamber (12) ) One straight hole (14) to the opposite side; two straight holes (25, 34) parallel to the wall surface of the chamber (12) enclosed by the knife box (11), at least one straight hole (34) center and straight hole (14) Intersect vertically; Two balls (40) are placed in the chamber (12) of the knife box (11). The two sides of the ball (40) are limited by the corresponding straight holes (25, 34), so that the partial balls (40) are exposed in the chamber (12) It can reciprocate along the length of the straight holes (25, 34) in the knife box (11); and A rod (42) passes through the straight hole (14), enters and exits the straight hole (25, 34) through the chamber (12) of the knife box (11), and two balls (40) are entered into the straight hole (25, 34) The rod (42) is separated as normal. The cutting tool change structure of the scissors according to claim 1, wherein a blade (66) has an exposed end (68) and a joint end (69), and the joint end (69) extends through the exposed end (68) A long hole (70) of the blade (66), one end of the long hole (70) becomes an opening (71) through the joint end (69), the other end is closed, and the blade (66) surrounds the long hole (70) Two latches (72) with openings facing each other are formed on the wall surface; When the joint end (69) enters the chamber (12) of the knife box (11) through the entrance (13), the rod (42) exits the straight hole (25, 34), and the two balls (40) follow the straight hole (25). , 34) Pass through the opening (71) of the long hole (70) in the longitudinal direction until the catch (72) is located between the two straight holes (25, 34); When the long hole (70) receives the rod (42), the rod (42) enters the straight hole (25, 34) and separates the two balls (40). The ball (40) catches the straight hole (25, 34). The wall surface and the catching part (72) can prevent the blade (66) from being pulled out of the chamber (12) of the knife box (11). The knife change structure of the scissors described in claim 2, wherein, under the condition of not affecting the interaction of the ball (40) and the rod (42), a handle (63) covers the knife change structure (10) but does not cover the entrance and exit ( 13); A shank (62) and a tool holder (64) are designed as one body. A pivot hole (75) of the shank (62) is adjacent to the tool holder (64), allowing the blade handle (63) to cover the tool change structure (10) The part of it is placed in the pivot hole (75); A shaft (61) passes through the handle (62), the blade handle (63), the chamber (12) of the knife holder (11) and the long hole (70) of the blade (66), centered on the shaft (61), the A cutting edge (67) of the blade (66) is interlaced with a slit (65) of the knife seat (64) to form a cutting tool (60). According to claim 3, the cutter change structure of the scissors, wherein the cutter box (11) is composed of a combined body (20) and a cover plate (30); the side of the body (20) sinks into a groove ( 22), the wall of the groove (22) facing the cover plate (30) is plunged into a straight hole (25), one side of the straight hole (25) is a central hole (24) that penetrates the main body (20), and the other is A semicircular groove (23) on the surface of the main body (20); the side of the cover plate (30) also has a central hole (33), and the central hole (33) is connected to a semicircular groove (32) on the side of the cover plate (30), The semicircular groove (32) perpendicularly intersects the straight hole (34) of the cover plate (30); During the merging, the groove (22) is closed by the cover plate (30) and becomes the chamber (12) inside the knife box (11), restricting the two straight holes (25, 34) to be parallel to each other and the distance between each other is greater than The diameter of the ball (40); the two semi-circular grooves (23, 32) merge into a straight hole (14), the straight hole (14) passes through the chamber (12) to the inlet and outlet (13) on the opposite side of the knife box (11) . The tool change structure of the scissors according to any one of claims 1 to 4, wherein the end of the defining rod (42) inserted into the chamber (12) is the inner end (44), and the rod (42) exposes the knife pocket ( 11) One end is regarded as the outer end (43). Between the outer end (43) and the inner end (44) are two flanges (45, 46) on the outside of the protruding rod (42); a switch (50) has one The toggle part (51), the toggle part (51) is placed between the two flanges (45, 46), and the switch (50) drives the toggle part (51) to drive the flanges (45, 46) along The axis of the rod (42) is displaced. According to claim 5, the cutting tool change structure, wherein one end of an arm (26) is connected with the knife holder (11), and the other end is bent into a bending part (27), and the bending part (27) has a A column (28), which is opposite to the outer end (43) of the rod (42); a compression spring (41) sleeves the rod (42) and the column (28), the compression spring (41) One end is against the bent part (27), and the other end is against the flange (45), providing a force required for the rod (42) to be inserted into the chamber (12) until the other flange (46) is blocked by the tool holder (11) So far. According to claim 3, the cutting tool change structure, wherein the shaft (61) is composed of a screw cylinder (73) and a stud (74). The cutting tool change structure of claim 4, wherein a fastener (15) passes through a fisheye hole (21) of the main body (20) and is locked into a screw hole (31) of the cover plate (30) , The fastener (15) connects the main body (20) and the cover plate (30) together. According to claim 5, the cutter change structure of the scissors, wherein the inner end (44) of the rod (42) is a cone.

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