JPS646989Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is suitable for manually bending metal pipes such as copper pipes, such as water supply pipes to the tank of low-tank flush toilets or water supply pipes to washrooms, at the construction site. A tool used for an operating member that is connected to the operating member; a tool body that holds the operating member movably in directions toward and away from the pipe to be processed that is received by the receiving member;
The operating member is provided with a serrated locking portion that is attached along the direction of movement of the operating member, and a feed pawl that is removable from the locking portion. An operating lever that can swing back and forth about a first axis in an orthogonal direction is pivotally supported, and the forward swinging force of the operating lever causes the feed pawl that is locked to the locking portion to be moved along with the operating member. Relating to a bending tool configured to be moved toward the workpiece pipe side and to change the locking position of the feed pawl with respect to the locking portion to a position away from the workpiece pipe by a back-swiveling operation of the operating lever. .

Conventionally, in the bending tool mentioned above, in order to quickly and easily operate the operating lever, the backward swinging of the operating lever to change the locking position between the feed pawl and the locking part is applied to the biasing force of the return spring. I'm letting it go. In addition to the return spring, a coil spring or tension spring is provided between the feed pawl and the operating lever for constantly pressing the feed pawl against the locking portion.

In view of the above points, it is an object of the present invention to make it possible to apply a predetermined biasing force to the feed pawl and the operating lever with a simple and inexpensive structure through rational improvements.

In order to achieve the above object, the present invention provides the bending tool described at the beginning, in which one end of the tension spring is placed at a first position on the side opposite to the operating lever of the tool body in the forward swing direction. connecting the sides, and further parallel to the first axis,
and a second axis that pivotably connects the feed pawl to the operating lever so as to pass through the first position and the first axis in the entire operating swing range of the operating lever. The feed pawl is provided at a position closer to the operating member than the first imaginary straight line, and the feed pawl passes through the second axis and the first position in the entire range in which the feed pawl swings to engage and disengage from the locking portion. The other end of the spring is connected to the feed pawl at a location closer to the operating member than the second imaginary straight line.

In other words, in the entire operating swing range of the operating lever,
Since the second axis for pivotally supporting the feed pawl is provided at a position closer to the operating member than the first imaginary straight line, the tension force generated by the tension spring installed across the feed pawl and the first position is applied. always biases the operating lever toward the backward swinging side.

In connecting the tension spring to the feed pawl, the tension spring is connected at a location closer to the operating member than the second imaginary straight line, so the tension force by the tension spring is equal to the feed pawl. The side that presses the claw against the locking portion is also always biased.

In other words, a tension spring is connected at a reasonable position between the feed pawl and the tool body, and that single spring not only applies the return force for back-swinging to the operating lever. , the feed pawl can be kept in pressure contact with the locking portion at all times.

Therefore, instead of the conventional two springs, only one spring is required, which reduces the number of parts by half and simplifies the installation configuration, providing a bending tool that is simple in construction and inexpensive. Now I can do it.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

The tool main body 1 is provided with a grip part 2 on one end side, and a pair of receiving members 3, 3 formed with recesses 3a of different curvatures on each of four sides on the other end side, and the above-mentioned A round shaft-shaped operating member 5 is provided on the tool body 1 so as to be movable toward and away from the pipe to be processed 4 received by the receiving members 3, 3, and at the tip of the operating member 5, A bending shoe 6 is attached to the bending shoe 6, which can be replaced with various types according to the bending angle, curvature, etc., and the pipe to be processed 4 is received by the receiving members 3, 3.
The bending tool is configured to apply a pressing force to the pipe 4 through a bending shoe 6 to bend the pipe 4 to be processed at a desired curvature.

Serrated locking portions 7 are formed over a predetermined length of the operating member 5 in the longitudinal direction.
An operating lever 8 is pivotally connected to the tool main body 1 so as to be able to swing back and forth, and the operating lever 8 has a
A feed pawl 9 having a ratchet configuration is pivotally connected, and is configured to apply a swing operation force to the lever 8 via the feed pawl 9 only when displacing the bending shoe 6 toward the workpiece tube 4. ing.

That is, when the operating lever 8 is swung forward toward the side approaching the grip part 2, the feed pawl 9 is locked with the locking part 7, and the bending shoe 6 is forcibly displaced to move the pipe to be processed. 4 is forcibly bent, and conversely, when the operating lever 8 is pivoted back to the side away from the grip part 2, the feed pawl 9 is not locked and swings back, causing the locking part 7... The locking position for the pipe 4 is changed to a position facing away from the pipe 4 to be processed.

One tension spring 10 is connected between a predetermined first position P ₁ of the tool body 1 and the feed pawl 9, and is configured to swing the feed pawl 9 toward the locking portion 7. At the same time, it is biased so as to swing the operating lever 8 away from the grip portion 2.Next, its specific configuration will be described in detail.

That is, in the entire swing range of the operating lever 8, a first imaginary straight line L ₁ passing through the first axis Q of the operating lever 8 and the first position P ₁ on the side of the grip portion 2 with respect to the first axis Q The feed pawl 9 is pivotally connected to the operating lever 8 at a location closer to the operating member 5 than the operating member 5. The feed claw 9 is connected to the locking portion 7...
In the entire range of rocking for engagement and disengagement while _constantly sliding on _... At a location closer to the operating member 5 than the virtual straight line _L2 ,
The other end of the tension spring 10 is connected to the feed pawl 9.

With the above configuration, the operating lever 8 can be used during bending.
When no force is applied to , the feed pawl 9 is pressed against the locking portion 7, as shown in Fig.
The operating lever 8 is swung away from the grip portion 2.

From this state, as the operating lever 8 is swung toward the side approaching the grip part 2, the feed pawl 9 is engaged with the engaging part 7, and the operating member 5 is rotated, as shown in FIG. The tube 4 to be processed is bent by forced movement.

Reference numeral 12 in the figure indicates a cam body that comes into contact with the feed pawl 9 and forcibly releases the feed pawl 9 from the locking portion 7, and a lever member 13 integrated with this cam body 12
As shown in FIG. 4, the operating member 5 is moved to the initial position against the biasing force of the compression coil spring 14 in a state where it is released from the locking portions 7. The cam body 12 also serves as a stopper that prevents the operating lever 8 from swinging away from the grip portion 2 .

In the figure, reference numeral 15 indicates a spring ball for biasing and maintaining the operating member 5 at the initial position. At the start of the bending operation, as the operating lever 8 is swung toward the side approaching the grip 2, the spring ball 15 is forcibly separated from the annular recess 16 by the operating force, and at the same time, the coil spring 14 Due to the biasing force, the operating member 5 is automatically displaced to the position where the bending shoe 6 comes into contact with the pipe to be processed 4, and the bending shoe 6 during the bending process is
The structure is such that it can be quickly set on the pipe 4 to be processed.

As the receiving member 3, a pulley-shaped member having a recess corresponding to the diameter of each tube 4 to be processed may be used, and may be replaced with a predetermined member as appropriate.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the bending tool according to the present invention; FIG. 1 is a front view, FIG. 2 is a partially cutaway side view, and FIG. FIG. 4 is an enlarged sectional view of the main part with the feed pawl released from the locking portion. DESCRIPTION OF SYMBOLS 1... Tool body, 3... Reception member, 4... Workpiece pipe, 5... Operating member, 6... Bending shoe, 7... Locking part, 8... Operating lever, 9...
Feed claw, 10... tension spring, P ₁ ...
1st position, P ₂ ...2nd axis, Q...1st axis,
_L1 ...first virtual straight line, _L2 ...second virtual straight line.

Claims (1)

[Scope of utility model registration request] A pair of receiving members 3, 3 are provided at one end of the tool body 1 and receive the pipe to be processed 4, and a bending shoe 6 is provided at the tip of the pipe to be processed 4 received by the receiving member 3. An operation member 5 that is arranged in series,
A tool main body 1 that holds the operating member 5 movably in a direction toward and away from the pipe to be processed 4 received by the receiving members 3, 3, and a tool body 1 that is attached to the operating member 5 along the direction of movement thereof. Serrated locking part 7
. . . and a feed pawl 9 that is removable from the locking portion 7, and a first axis Q in the direction perpendicular to the moving direction of the operating member 5 on the tool body 1.
A control lever 8 that can swing back and forth is pivoted around the
The locking portion 7 is
The feed pawl 9 that is engaged with the locking portion 7 is moved together with the operating member 5 toward the pipe to be processed 4, and the locking position of the feed pawl 9 with respect to the locking portion 7 is adjusted by swinging the operating lever 8 back and forth. In the bending tool configured to change the position away from the workpiece pipe 4, the bending tool is pulled to a first position _P1 on the side opposite to the operating lever 8 of the tool body 1 in the forward swing direction. A second axis P connects one end side of the tension spring 10, is parallel to the first axis Q, and pivotably connects the feed pawl 9 to the operating lever 8. ₂ at the first position P ₁ in the entire operating swing range of the operating lever 8.
and the first axis Q, and is provided at a position closer to the operating member 5 than the first imaginary straight line _L1 passing through the first axis Q, and the entire range in which the feed pawl 9 swings in order to engage and disengage from the locking portion 7. , the second axis P ₂ and the first position
The operating member 5 is closer to the second virtual straight line _L2 passing through _P1 .
A bending tool characterized in that the other end of the spring 10 is connected to the feed pawl 9 at a location on the side.