JPS6222262Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a portable bender that can be easily transported by two people to a construction site.

For example, Tokko Akira has been a vendor in the past.
49-15544 is known. This device transmits the rotation of the motor to the turntable via a transmission, a reduction gear, a transmission gear, a driven gear, a rotating shaft, etc., and when the clamp member attached to the turntable rotates together with the turntable, Reinforcing bars and the like are bent between the clamp member and the center axis of the turntable. Then, an extremely large-scale electric control device is used to connect the motor to a speed reducer, and the motor is rotated forward and backward as programmed to bend the motor to any desired bending angle. By the way, this is an extremely large-scale stationary bender, although it allows you to obtain any desired bending angle.

Also known is a method disclosed in Japanese Patent Application Laid-Open No. 48-40668, in which a bending roll is attached above the main shaft, and a pipe is held between the holding piece and the bending roll. The pipe is bent while rotating the bending roll. Normal rotation and reverse rotation of the bending rolls, etc. is performed using limit switches, but each limit switch is fixedly installed so that only 180 degrees of bending can be achieved. This one is also a large stationary type.

By the way, especially in recent years, the use of bent reinforcing bars, etc. at construction sites has become more common, but until now, reinforcing bars, etc. were bent using a large factory-equipped bender like the one mentioned above, and then bent at the construction site. I was carrying it to This is extremely inconvenient, and it would be extremely convenient to be able to bend what you want on site as you wish, but this invention can be easily transported to the site with the help of two people and can be used with a regular household power source. The purpose of the present invention is to provide a convenient portable bender which has a simple mechanism, is easy to operate, and whose bending angle can be arbitrarily set.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a portable bender according to this invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a partially sectional perspective view showing a mechanical part. Reference numeral 1 denotes a case body having a substantially rectangular shape, and the case body 1 is made of a suitable light metal or the like, and has foldable handles 2, 2, 2, 2 attached on all sides. In the portable bender according to this invention, not only the case body 1 but also each component stored in the case body 1 is made as light as possible so that it can be carried by two people. ,2,2,
2 and use it.

A casing 3 sealed inside the case body 1
is fixed, and a motor 4 is mounted on the casing 3. The reason why the sealed casing 3 is used is mainly to prevent the electromagnetic clutch housed inside from attracting metal pieces on the outside. The motor 4 is a small single-phase commutator motor that can be used with a 100V AC power source in a general household and has the characteristic of providing a large starting torque. A rotary shaft 5 of the motor 4 is communicated within the casing 3, and the rotary shaft 5 is connected to an electromagnetic clutch 6 via a suitable reduction gear mechanism. A rotary shaft 7 disposed at the center of the electromagnetic clutch 6 is further connected to another rotary shaft 8 via a reduction gear so that power can be taken out of the casing 3. A transmission gear 9 is integrally formed at the upper end of the rotating shaft 8. Note that a separate transmission gear 9 may be attached to the rotating shaft 8.

A ball bearing 11 is attached to the lower surface of the upper plate 10 of the case body 1, and a vertical central axis 14 is mounted between the ball bearing 11 and the pillow block 13 attached to the lower plate 12.
is installed. The central shaft 14 is rotatable while being supported between the ball bearing 11 and the pillow block 13. A large driven gear 15 is fixed to the central shaft 14 and meshed with a transmission gear 9 of the rotating shaft 8. A pin 16 is provided protruding from one location on the lower surface of the driven gear 15. A central shaft 17 is fixed on the top plate 10 on the same axis as the central shaft 14. That is, the ball bearing 11
The central axis 17 is above the object to which it is attached.
A sleeve 18 is fitted around the outer periphery of the central shaft 17. Note that the upper plate 10 has an arc-shaped elongated hole 19 centered on the central axis 17. Also, the top plate 1
0, there is a receiver 20 for receiving the member to be bent.
is installed. The receiver 20 can be adjusted for movement in the front-rear direction, and is fixed by tightening with a tightening bolt 21.

An arm 22 is attached near the upper end of the central shaft 14, and a vertical shaft 23 is attached to the tip of the arm 22. The upper end of the vertical shaft 23 extends upward through an arcuate long hole 19 formed in the top plate 10, and a bending roll 24 is rotatably attached thereto. Note that the bending rolls 24 can be exchanged with ones having different diameters. A spiral gear 25 is attached to the middle of the central shaft 14. The spiral gear 25 is connected to the central shaft 14
It is free against the ground and can be rotated freely. A limit switch 26 is attached above the spiral gear 25. Another spiral gear 27 is provided to mesh with the spiral gear 25, and a connecting rod 28 is fixed to the center of the spiral gear 27. When the connecting rod 28 is rotated, the spiral gear 27 rotates the spiral gear 25 to change the position of the limit switch 26.

Figure 4 shows how to connect the connecting rod 2 by turning the dial.
8 shows a mechanism for rotating the spiral gear 27. One half of the connecting tube 29 is fitted into the tip of the connecting rod 28, and the rear end of the operating rod 30 is fitted into the other side of the connecting tube 29. Connecting pipe 2
A longitudinal slit 31 is formed in 9, and a pin 32 is inserted into the operating rod 30 through the slit 31, thereby allowing the operating rod 30 to move back and forth. A scale plate 33 is attached to the front plate of the case body 1, and a tapered hole 34 is formed in the center of the scale plate 33 so that the rear side widens. Then, a taper plug 35 having a taper that matches the taper of the taper hole 34 is attached to the outer periphery near the tip of the operating rod 30, and a spring 37 is inserted between the connecting pipe 29 and the taper plug 35 to move the taper plug 35 forward. is energized. Attach the front end of the operating rod 30 to the case body 1
The dial 36 is attached to the outside.

When the motor 4 is turned on, the central shaft 14 is rotated via the reduction gear mechanism, the electromagnetic clutch 6, the rotating shafts 7, 8, the transmission gear 9, and the driven gear 15. A spring 38 is attached for urging in a direction opposite to the rotation direction. When the electromagnetic clutch 6 is disengaged, the force of the spring 38 causes the center shaft 14 to rotate in the opposite direction and return to its original position.

An eccentric ring 39 is fixed near the lower end of the central shaft 14. The eccentric wheel 39 rotates together with the central shaft 14, and a sliding ring 40 is fitted around the outer periphery of the eccentric wheel 39. One end of the sliding wheel 40 is attached to a rod 42 by a pin 41. The tip of the rod 42 is inserted into a cylinder 43 fixed to the case body 1. The cylinder 43 is provided with an air vent hole 44.

To operate the vendors listed above, do the following: First, when you press the dial 36, the spring 3
The operating rod 30 moves forward while retracting 7, and the taper plug 35 moves forward within the taper hole 34 to open the dial 36.
becomes able to rotate. When the dial 36 is turned to an appropriate angle according to the scale on the scale plate 33, the spiral gear 25 rotates via the operating rod 30, the connecting rod 28, and the spiral gear 27, and the limit switch 2
6 is rotated to set the bending angle of the member to be bent. When the dial 36 is released, the taper stopper 35 is fitted into the taper hole 34 by the force of the spring 37, and the dial 36 is fixed by frictional force, and therefore the position of the limit switch 26 is also fixed.

Next, the member to be bent is placed on the receiver 2 on the top plate 10.
0, and place it between the center shaft 17 and the bending roll 24. At this time, switch 45 of motor 4
has already been engaged, but when the switch 46 of the electromagnetic clutch 6 is engaged, the rotation of the motor 4 will be caused by the rotation shaft 5,
Reduction gear mechanism, electromagnetic clutch 6, rotating shafts 7, 8,
The central shaft 14 is rotated via the transmission gear 9 and the driven gear 15. The central shaft 14 rotates the vertical shaft 23 via the arm 22, and the vertical shaft 23 rotates within the arc-shaped elongated hole 19 of the top plate 10. At this time, the bending roll 24 bends the member to be bent between it and the central axis 17. In addition, a receiver 20 is provided at the rear of the bent member.
is being received. Then, when the bending roll 24 rotates by a predetermined angle to bend the bent member by a predetermined angle, the pin 16 of the driven gear 15 hits the limit switch 26 of the spiral gear 25 to disconnect the electromagnetic clutch 6. The moment the electromagnetic clutch 6 is disengaged, the central shaft 14 is pulled by the spring 38 and rotates in the opposite direction to return to its original position, preparing for the next bending operation. Eccentric wheel 39, sliding wheel 40, rod 4
2. The mechanism consisting of the cylinder 43 is for absorbing the shock at this time. This mechanism uses air action to absorb shocks, and this mechanism not only absorbs shocks well, but also has almost no failures no matter how many times it is operated. The switch 47 is for disengaging the electromagnetic clutch 6, and if an unexpected accident occurs during bending, pressing the switch 47 immediately interrupts the rotation of the bending roll 24 and returns to its original state.

Although one embodiment of this invention has been shown above, the embodiments of this invention are not limited to the above. For example, the pin 16 does not necessarily need to be attached to the driven gear 15, but may be attached to the central shaft 14 itself, or to some other object that moves integrally with the central shaft 14. Further, it is not necessarily necessary to use the pin 16, and any protrusion will suffice. In short, any object that presses the limit switch 26 is sufficient. The protrusion is driven gear 1
It may be provided on the spiral gear 25 instead of on the 5th etc. side. In this case, the limit switch 26 will be provided on the driven gear 15, etc. In addition,
Although the limit switch 26 is shown as being provided on the spiral gear 25, the limit switch 26 or the above-mentioned protrusion may be provided as long as it is an arbitrary rotating member that rotates around the central axis 14. Not even. Any mechanism may be used for rotating the rotating member by rotating the dial 36. Furthermore, any mechanism other than the use of the spring 38 may be used for rotating the center shaft 14 back to its original position when the electromagnetic clutch 6 is disengaged. Other design changes are possible in various places.

The structure of this invention is as described above, and this invention has the following excellent effects.

Conventional benders were large, stationary type benders, so up until now we had no choice but to use a large factory-equipped bender to bend reinforcing bars and the like before transporting them to the site, but this was very inconvenient. The first feature of the portable bender according to this invention is that it is a small and lightweight bender that can be carried by two people and taken to the site.In order to make it small and lightweight, the internal mechanism was first improved. The case body 1 has a substantially cubic shape as the most efficient shape for compactness, and is also small and lightweight. We have also made the internal mechanism as simple, lightweight, and compact as possible.
The entire device is small and lightweight enough to be carried by two people. A handle 2 for carrying is attached to the outer periphery of the case body 1, and two people can easily carry the case to a site while holding the handle 2. Since the single-phase commutator motor 4 is used and can be used with a general household power source, it can be used in any field. Therefore, compared to using conventional large stationary benders, it is extremely convenient because it can be easily transported to the site and bent the required reinforcing bars to the required angle on the spot. be.

In addition, even though the entire structure has been made smaller and lighter as mentioned above, the use of the single-phase commutator motor 4, which is small and light but has a large starting torque, has a bending capacity almost equal to that of conventional large stationary types. I was able to make it so big that it didn't change. Furthermore, an elastic return mechanism using a spring 38 or the like is provided so that the driven gear 15 or the like is rotated back to its original position when the electromagnetic clutch 6 is disengaged.
Even though the single-phase commutator motor 4, which is difficult to reverse, is used, the bending roll 24 can be quickly and easily returned to its original position at the end of bending to prepare for the next bending operation. bending roll 2
4 can be exchanged with one of a different diameter, so it is possible to bend various bent members with different diameters while exchanging it, and the range of use is extremely wide.

In particular, the portable bender according to this invention is portable, small and lightweight, but has the following advantages that are comparable to large, stationary types with good performance. We have it. That is, not only is it really easy to set the bending angle, but it is also possible to set any bending angle. To set the bending angle, all that is required is to operate the rotating member disposed around the outer periphery of the central axis 14 of the driven gear 15 from outside the case body 1 and rotate it around the central axis 14 by the desired angle. When the rotating member is rotated by a desired angle, the limit switch 26 attached to the rotating member or the pin 16 for contacting and activating the limit switch 26 and other protrusions also move together with the rotating member. Rotates by the same angle as the rotation angle of. Then, the switch 45 of the single-phase commutator motor 4
When the switch 46 of the electromagnetic clutch 6 is turned on after inserting the The signal is transmitted to the bending roll 24, and the bending roll 24 is rotated to bend the bent member. At this time, the pin 16 provided in the driven gear 15 and other locations is used to contact and operate the limit switch 26. When the other protrusion or limit switch 26 rotates in unison with the driven gear 15, and rotates by the same angle as the rotation angle of the aforementioned rotating member, the limit switch 26 touches the pin 16 or other protrusion. It is activated by contact and disconnects the electromagnetic clutch 6 to stop the bending roll 24 from rotating. Therefore, the bending angle must be set using case body 1.
This can be done easily by external operation, and any desired bending angle can be set accurately.

Incidentally, at construction sites, etc., it is often necessary to re-bend something that has already been bent, and the portable bender according to this invention makes it extremely easy to correct the bending angle.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a portable bender according to this invention, FIG. 2 is a sectional view thereof, FIG. 3 is a partially sectional perspective view of the main part, and FIG. 4 is a sectional view of the main part. 1... Case body, 2... Handle, 3... Casing, 4... Motor, 5, 7, 8... Rotating shaft, 6
... Electromagnetic clutch, 9 ... Transmission gear, 10 ... Top plate, 14 ... Center shaft, 15 ... Driven gear, 16
... Pin, 17 ... Central shaft, 19 ... Arc-shaped long hole, 20 ... Receiver, 22 ... Arm, 23 ...
Vertical axis, 24...Bending roll, 26...Limit switch, 25, 27...Spiral gear, 28...
...Connection rod, 30...Operation rod, 36...Dial,
38... Spring, 45, 46, 47... Switch.

Claims (1)

[Scope of utility model registration request] A handle 2 for carrying is attached to the outer periphery of the case body 1, which is small and almost cubic in shape and lightweight. The transmission gear 9 is connected to the driven gear 15, and the driven gear 9 and the arm 22 are connected to each other.
A central axis 17 is connected to the driven gear 15 so as to rotate together with the driven gear 15 as a center, and a central axis 17 is located on the same line as the central axis 14 and on the top plate 10 of the case body 1.
A vertical shaft 23 is attached to the tip of the arm 22, and the upper end side of the vertical shaft 23 projects above the top plate 10 through an arcuate long hole 19 made in the top plate 10 about the central axis 17. A rotatable bending roll 24 is replaceably attached to the protruding part,
Further, the limit switch 26 or a pin 1 for contacting and operating the limit switch 26
6 is attached to the central axis 1 of the driven gear 15.
4, the rotating member is placed on the outer periphery of the case body 1.
A pin 16 that can be rotated around the central axis 14 by external operation and that contacts the limit switch 26 to actuate it.
Alternatively, a limit switch 26 is provided on the driven gear 15 so that it moves integrally with the driven gear 15,
The electromagnetic clutch 6 is wired so that when the pin 16 operates the limit switch 26, the electromagnetic clutch 6 is disengaged, and when the central shaft 14 rotates, it is biased in a direction to return it to its original position. An elastic return mechanism such as a spring 38 is provided between the central shaft 14 side and the case body 1 side, so that the driven gear 15 etc. can be rotated back to the original position when the electromagnetic clutch 6 is disengaged. Portable bender.