JPS62224517A - Pipe cutter - Google Patents

Abstract

PURPOSE:To enable the free adjustment of pipe threading and cutting works even at a restricted place by providing a rod having a plate spring and moving vertically on the turn of an operation lever, and a freely detachable handle for rotating a cutter edge on a ratchet. CONSTITUTION:An operation lever 30 is turned upward (arrow 'A'), a rod 25 is lifted, a pipe 2 is inserted in the opening 59 of a cutter proper 23 and the lever 30 is turned 90 deg. downward (arrow 'B'). Then, a plate spring 24 gives a proper pressing force and the threading depth of a cutter edge 4 into the pipe 2 is thereby determined. And a set knob frame 22 is turned together with the cutter proper 23 for cutting the pipe 2. Also, a feed member with a handle 46 is fitted to the side of the cutter proper 23 and when the handle 46 has been repeatedly turned back and forth (arrows 'C' and 'D'), the cutter proper 23 turns in one direction on a ratchet, thereby cutting the pipe 2. According to the aforesaid constitution, smooth pipe threading and cutting can be done using the plate spring 24 through the fall of a rod on lever operation. Also, a pipe can be cut even in a restricted space with the ratchet of the feed member having a freely detachable handle.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a handy type pipe cutter.

<Prior Art> As a conventional hand-held pipe cutter, one shown in FIG. 7, for example, is known. The pipe cutter 1 includes a pair of guide rollers 3 that support a pipe 2, a long set knob frame 5 having a cutting blade 4 for cutting the pipe 2, and a main body 7 having an opening 6 for inserting the pipe 2.
It is set up in

The cutting blade 4 is rotatably held at the lower end of a rod 9 with a knob 8 disposed within a set knob frame 5, and the feed amount can be adjusted by rotating the knob 8. In cutting the pipe 2, first, the pipe 2 is inserted through the opening 6 of the main body 7 between the cutting blade 4 and the pair of guide rollers 3, and the knob 8 is rotated to adjust the feeding amount of the cutting blade 4. . Next, the set knob frame 5 is rotated in the same direction several times to cause the cutting blade 4 to bite into the pipe 2, thereby cutting the pipe 2.

<Problems with the Prior Art> However, in such a conventional vibrator, the amount of biting of the cutting blade 4 is adjusted by rotating the knob 8 within the long set knob frame 5. In other words, the adjustment of the amount of biting depends on the operator's intuition, so first rotate the pipe cutter 1 to check the amount of biting of the cutting blade 4 into the rear pipe 2, and if the cut cannot be made, further adjust the knob 8. Only by rotating the pipe 2 can the pipe 2 be cut, which makes the work cumbersome and time-consuming. Additionally, since the set knob frame 5 is long, it may be difficult to freely rotate the set knob frame 5 depending on the work location.

<Means for solving the problems> Means for solving the problems described above will be explained below using FIGS. 1 to 6 corresponding to the embodiment.

In this invention, as the pipe cutter 20, the upper end 26 of the rod 25 with the disc spring 24 passed through the set knob frame 22 has a substantially inverted shape, and a plurality of presses having different lengths from the center of rotation have a surface. A lever 30 is rotatably provided. A holding frame 37 is provided at the lower end 35 so that the force of the spring 24 can be applied to the cutting blade 4 at all times. By rotating the operating lever 30, the loft 25 is lowered and the amount of pipe 2 fed can be adjusted. A ratchet pawl 51 is provided on one of the corresponding side surfaces 45 and 52 of the feed member 47 with a handle 46 having a shape and a corresponding side surface 45, 52 of the main body 23, and a ratchet pawl 51 is provided on the other side. A plurality of feed grooves 53 are formed which can freely engage with the ratchet pawl 51 in the center direction. And the main body 23
When mounted on the side surface 45, the cutting blade 4 together with the main body 23 can be rotated by rotating the handle 46.

<For production> Next, the action will be explained.

In cutting the pipe 2, a rod 25 with a disc spring 24 is disposed on the set knob frame 22, and a cutting blade 4 to which a force is applied to press the disc spring 24 is provided at the lower end 35 of this rod 25. . The pressing force selected by rotating the operating lever 30 provided at the upper end 26 of the rod 25 is adjusted according to the surface 34. Since it is adjustable, there is no need to operate the knob each time the main body 23 rotates, and since the disc spring 24 is used for feeding, the cutting is performed gradually and smoothly, resulting in extremely smooth cutting. Furthermore, in a work place where it is difficult to rotate the set knob frame 22 once, the handle 46
If space for repeated back and forth rotation can be secured, the ratchet pawl 5I of the main body 23 and the feed groove 53 of the sending part 47 can be ratcheted by attaching the feed member 47 with the handle 46 to the side surface 45 of the main body 23. handle 46
The pipe 2 can be cut by repeating the sequential feeding.

Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. Incidentally, the same parts as in the prior art are denoted by the same reference numerals, and redundant explanation will be omitted.

The pipe cutter 20 mainly includes a pair of guide rollers 21, a set knob frame 22 that rotatably supports the cutting blade 4, and a main body 23 that holds these.

The set knob frame 22 has a substantially U-shaped side surface, and is provided with a rod 25 with a disc spring 24 passing through the safe top frame 22. The upper end 26 of this rod 25 is made to protrude through the upper surface part 28 of the set knob frame 22 with the plate 27, and the protruding part 29 is connected to the operating lever 30 which has a substantially inverted shape.
are rotatably connected via a connecting portion 31 . More specifically, this connecting portion 31 is rotatably connected to the protruding portion 29 via a pin 32, and its pivot point 33 rotates the operating lever 30 by 90 degrees (as indicated by the arrow A in FIG. 2). The contact surface with the plate 27 has a curved shape so that it moves up and down when the plate 27 is moved (direction B). That is, the presses having different lengths from the center of rotation have surfaces 34 (see FIG. 2). The amount of vertical movement of this rotation fulcrum 33 is set as the amount of biting into the cutting blade 4.

A holding frame 37 is provided at the lower end 35 of the rod 25 so that pressing force of the disc spring 24 can be applied to the cutting blade 4 at all times. This holding frame 37 has a bifurcated shape as a whole, and a disc spring 24 is attached to the upper part.
The lower end portion of the receiver is provided with a seat 56 via a pin 57, and the rotary shaft 38 at both ends of the cutting blade 4 is rotatably held by notch support portions 58 on both side surfaces. Furthermore, the rotation axis 38 of the cutting blade 4
The re-extension shaft portion 39 is engaged in a guide hole 41 of a pair of guide plates 40 provided at the lower end 35 of the set knob frame 22 to face each other. That is, the cutting blade 4 is rotated by the rotation of the operating lever 30.
The vertical movement of the guide hole 41 is made smooth.

The main body 23 has a substantially curved U-shaped side surface, and one side surface (
the guide plate 40 of the set knob frame 22 (on the left in FIG. 3),
The support frame 42 of the pair of guide rollers 21 and the bolt 43
(The bolts on the guide plate 40 side are not shown). Note that 59 is an opening. The support frame 42 has long holes 4
4, and the diameter of the vibrator 2 and the amount of biting of the cutting blade 4 can be adjusted by moving the bolt 43 up and down within the elongated hole 44. And the other side 45 of the main body 23 (
On the right in FIG. 3) there is provided a feed member 47 with a handle 46 which is removable and has a corresponding mounting configuration. The other side surface 45 is provided with a protruding shaft portion 48 and has a recess 49 as shown in FIG.
is rotatably supported while being biased in one direction. A plurality of feed grooves 53 are formed on corresponding side surfaces 52 of the feed member 47 with the handle 46 so as to be able to engage the ratchet pawls 51 in the circular direction (see FIGS. 4 and 5). The feed portion 47 is inserted into the shaft portion 48 of the other side surface 45, and the feed groove 53 is engaged with the ratchet pawl 51, and is rotatably supported with respect to the shaft portion 48 via the stopper ring 54. It is something that The stopper ring 54 is removably attached to the engagement groove 55 of the shaft portion 48.

Next, the action will be explained.

In cutting the pipe 2, first, the case where the feed section 47 with the handle 46 is removed will be described.

Rotate the operating lever 30 upwards (to the right in Figure 3),
The pipe 2 is inserted through the opening 6 of the main body 23. Next, the operating lever 30 is rotated 90 degrees downward (in the direction of arrow B in the figure) so that it aligns with the set knob frame 22. At the same time, the rod 25 is moved downward to set the amount of biting of the cutting edge 4. The pipe 2 is supported at three points by the cutting blade 4 and a pair of guide rollers 21. At this time, an appropriate pressing force is applied to the cutting blade 4 by the disc spring 24. Then, by holding the safety top frame 22 and rotating the main body 23, the vibrator 2 will be cut off. Therefore, the amount of biting into the cutting blade 4 can be easily adjusted by simply rotating the operating lever 30. Since the biting of the vibrator 2 is performed by pressing the disc spring 24 through force, the feeding is performed gradually and smoothly, so that rotation becomes extremely smooth.

Next, the case where the feed member 47 with the handle 46 is used will be explained. First, the feed member 47 with handle 46 is attached to the other side surface 45 via the stopper ring 54.

Then, in exactly the same way as before, the vibrator 2 is placed in the vibrator cutter 1 just before the rotating state. By repeatedly rotating the handle 46 back and forth (arrow C5D in FIG. 1), the ratchet pawl 51 is sequentially engaged with the feed groove 53.
The main body 23 is rotated in one direction by repeating detachment and the vibrator 2 is cut. Therefore, the set knob frame 22
Even if you are at a work site where it is difficult to rotate the handle 46, as long as you have enough space to move the handle 46 in small increments,
The pipe 2 can be cut using the feed member 47 with the handle 46.

In the above explanation, the ratchet pawl 51 is referred to as the main body 23.
Although the feed groove 53 was provided on the side surface 52 of the feed member 47 with the handle 46, the ratchet pawl 51 was provided on the side surface 52 of the feed member 47 with the handle 46, quite the contrary.
Of course, the feed groove 53 can be provided on the side surface 45 of the main body 23.

Effects> Since the pipe cutter according to the present invention has the content as described above, when cutting a pipe, a rod with a disc spring is disposed on the set knob frame, and a disc spring is pressed against the lower end of the rod. is equipped with a cutting edge that is applied with force, and the amount of pipe feed can be adjusted by lowering the rod by rotating the operating lever provided at the upper end of the rod, so the knob can be operated one by one as the main body rotates. Moreover, since a disc spring is used for feeding, the cutting can be carried out gradually and smoothly, resulting in extremely smooth cutting. Furthermore, the feed member with a handle is detachable from the main body and engages with a ratchet, so even if you are in a work place where it is not possible to rotate the set knob frame once, you can cut the pipe as long as you have enough space to rotate the handle. Effects can also be obtained.

[Brief explanation of drawings]

Fig. 1 is an overall schematic perspective view of a pipe cutter showing an embodiment of the present invention, Fig. 2 is a side view seen from the direction indicated by the arrow - in Fig. 1, and Fig. 3 is a side view as seen from the direction indicated by the arrow - in Fig. 1. 4 is a plan view of the feeder with a handle, and 5 is a sectional view of the main parts as seen from the direction.
Fig. 4 is a side view seen from the direction indicated by the arrow ■, Fig. 6 is an explanatory view showing the engagement state between the ratchet pawl provided on the side surface of the main body and the feed groove of the feed section with handle, and Fig. 7 is FIG. 2 is a schematic side view showing a conventional pipe cutter. 20.--Pipe cutter 30.--Operation lever 2
1--Guide roller 34---Press surface 22.
--- Set knob frame 35 --- Lower end 23 ---
Body 37...Holding frame 24--Disc spring 46--Handle 25--Rod
47-・Feeding member 26・-・Top end
51-・Ratchet pawl Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 47 υ Butt male Fig. 6 23 pieces A) 'l]-ra

Claims (1)

[Claims] A pair of guide rollers for supporting the pipe and a set knob frame that rotatably supports a cutting blade for cutting the pipe are provided in a main body having an opening for inserting the pipe to insert and support the pipe. In a pipe cutter that cuts pipes by rotating the cutting blade along with the main body in the circumferential direction of the pipe, the upper end of the rod with a disc spring that passes through the set knob frame is approximately inverted L-shaped. An operating lever having a plurality of pressing surfaces of different lengths from the center of rotation is rotatably provided, and a holding frame is provided at the lower end of the lever that can constantly apply the pressing force of the disc spring to the cutting blade, and the operating lever is rotated. The feed amount of the pipe can be freely adjusted by lowering the rod at the handle, and a feed member with a handle that can be attached to and detached from the side of the main body and has a corresponding mounting shape, and a ratchet on one of the corresponding sides of the main body. A pawl is provided, and a plurality of feed grooves are formed on the other side that can freely engage the ratchet pawl in the circular direction,
A pipe cutter characterized by the fact that the cutting blade of the main body can be rotated by rotating the handle when attached to the side of the main body.