JP3309091B2 - Electric cable cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable cutter for cutting wires such as electric wires and steel bars, and more particularly to driving a planetary gear mechanism with an electric motor powered by a portable battery to cut electric wires and the like. The present invention relates to an electric cable cutter.

[0002]

2. Description of the Related Art A cable cutter is used to cut or connect a cable in an electric construction work. Many conventional cable cutters clamp an electric wire with a clamp and cut it with a hydraulic cutter. Alternatively, a manual cutting machine as shown in FIG. 6 is used. This manual cutting machine includes a link 101 having a blade 101a at a tip, a link 102 having a blade 102b, a link 103 and a handle 104,
105 together with a so-called toggle mechanism. This cutting machine has a handle 104 and a handle 105
Is turned in the direction of the arrow, the blades 101a and 102b rotate in opposite directions about the axis 106, and the cable or steel bar sandwiched between these blades is cut by shearing force. In addition, there are electric cable cutting machines, but many of them require a code for connecting to a power supply.

[0003]

In electric construction work, it is necessary to work in a state where the degree of freedom of the limbs is restricted, such as climbing to a high place, supporting the body with one hand, or holding another object. Often. Therefore, the above-described manual case
In order to use a bull cutter, a manual cutting machine, or the like in an inconvenient place such as a high place, it is necessary to use some kind of auxiliary tool, and it also requires considerable arm strength, which is very inconvenient. In addition,
There is an inconvenience that a bull cutting machine requiring a power supply has a limited available place.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a portable electric cable cutter which can be freely carried and operated with one hand even in an inconvenient place such as a high place. The purpose is.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is directed to an electric motor (2) and an electric motor (2). A gear reduction mechanism of a driven pinion (51a) and a large gear (51b); and an electric motor driven through the gear reduction mechanism, around an axis parallel to a drive axis direction of the electric motor (2) and the electric motor. A multi-stage planetary gear reduction mechanism (5) disposed in a gear case (6) adjacent to the drive shaft, and a drive shaft of the electric motor (2) on the same axis as the multi-stage planetary gear reduction mechanism (5). A pinion (56a) disposed at a position opposite to the position of 2a) and provided integrally with a drive shaft (56) driven by the multistage planetary gear reduction mechanism; and the gear case (6).
And a drive shaft (56) rotatably mounted on the fixed blade and provided with a blade portion on a rib portion and driven by the multi-stage planetary gear reduction mechanism (5). )
An electric cable cutter comprising: a rotary blade (8) formed on the outer peripheral edge thereof with a gear meshing with a pinion (56a) provided integrally with the motor; and a drive source (10) for the electric motor. Features.

According to a second aspect of the present invention, a drive shaft (5) driven by the multi-stage planetary gear reduction mechanism (5) is provided.
The gear (8b) formed on the outer peripheral edge of the rotary blade (8) that meshes with the pinion (56a) integrally provided in 6) is a sector gear.

[0007]

The operation when the electric cable cutter is used as the above means will be described with reference to the accompanying drawings (FIGS. 1 to 5). In the rotary blade (8), the gear (8b) portion is a planetary gear reduction mechanism (5).
The pinion (56a) at the end of the shaft is meshed with and driven to rotate. In this case, since the rotary blade (8) is driven with a large driving torque, a hard cable or the like placed between the fixed blade (7) and the rotary blade (8) is easily cut. Further, the rotary blade (8) whose arc portion is a sector gear (8b) comes off the pinion (56a), but re-engages with its own weight, so that the cable or the like from the direction of the arrow R as shown in FIG. Can be inserted. Therefore, in this case, even a long cable can be easily cut into the cutter portion from the side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an electric cable cutter according to the present invention, FIG. 2 is a side view as viewed in the direction of the arrow P in FIG. 1, and FIG. 3 is a sectional view as viewed in the direction of the arrow AA in FIG. FIG. 4 is a longitudinal sectional view showing the structure, and FIG. The electric cable cutter has a gear reduction mechanism including a pinion 51a driven by the electric motor 2 and a large gear 51b meshed with the pinion 51a, and a second gear formed on a boss of the large gear 51b. 2 pinions 5
A second gear reduction mechanism comprising a gear 2a and a large gear 52b meshing with the pinion 52a; a planetary gear reduction mechanism 5 starting from a sun gear 53a formed on a boss portion of the large gear 52b; A planetary gear reduction mechanism which is rotatably pivoted by a switch lever-3 for operating a switch for turning on and off the switch 2, a fixed blade 7 provided with a blade portion 7a, and a shaft 11 at an upper end of the fixed blade 7; A rotary blade 8 provided with a blade portion 8a driven by the power supply 5 and a storage battery cartridge 10 containing a storage battery serving as a power supply for the motor 2 (the storage battery is replaced with a plug-in type power supply). May be).

The planetary gear reduction mechanism 5 includes a gear case 6
The gear case 6 and the motor 2 are disposed inside the upper part of the split case 1 and the switch 4
The switch lever 3 is disposed below the case 1.
The storage battery cartridge 10 is detachably attached to the lower part of the case 1. The gear case 6 is arranged around an axis parallel to the drive shaft direction of the electric motor 2 and adjacent to the electric motor.

A switch lever-3 disposed below the case 1 includes a forward switch lever-3a for driving the motor 2 in a direction in which the rotary blade 8 advances (a direction in which the cable is cut). Reverse switch lever 3b to reverse
And a lock knob 31. In consideration of safety, the forward switch lever-3a and the reverse switch
The motor 2 is not turned on unless any of the switch levers 3b depresses the lock knob 31. As described above, this switch incorporates the lock knob 31 in order to use the switch lever-3 as a safety switch lever. However, a normal ON / OFF switch may be used.

The fixed blade 7 having a blade portion 7a on one side is fixed to an end of the gear case 6 with a bolt or the like. The rotary blade 8 has a blade portion 8a formed on an inner rib portion and a sector gear 8b formed on an outer arc portion. The sector gear 8b of the rotary blade 8 meshes with a pinion 56a at the final output end of the planetary gear reduction mechanism 5, as described later.
Incidentally, as the rotary blade 8, instead of forming the sector gear 8b, a blade portion may be formed on the inner rib portion as a normal circular gear.

As shown in FIG. 3, the drive shaft 2a of the motor 2
The first-stage small gear 51a fitted to the first gear drives the large gear 51b. A second-stage small gear 52a is formed on a shaft portion (boss) of the large gear 51b. A sun gear 53a is formed on the shaft of the second-stage large gear 52b.
a constitutes the planetary reduction mechanism 5.

Next, the planetary gear reduction mechanism 5 for driving the rotary blade 8 will be described. The sun gear 53a meshes with a planetary gear 53b, and the planetary gear 53b meshes with an internal gear 53c fixed to the gear case 6. The planet gear 53b is pivotally supported by a planet holding plate 53d having a sun gear 54a formed on the opposite side. The sun gear 54a has an internal gear 54c fixed to the gear case 6.
The planetary gear 54b that meshes with the gear is also meshed. The planetary gear 54b has a shaft 5 on the opposite side that forms a sun gear 55a.
And planetary holding plate 54d spline-coupled to 5
It is pivoted on.

Further, the sun gear 55a is a planetary gear 5 which meshes with an internal gear 55c fixed to the gear case 6.
The planetary gear 55b is rotatably supported by a planet holding plate 55d which is the last stage of the planetary gear reduction mechanism 5. The planetary holding plate 55d is spline-fitted to the drive shaft 56. The drive shaft 56 is on the same axis as the gear reduction mechanism 5 and is connected to the drive shaft 2 of the electric motor 2.
It will be located at a position opposite to the position a. Further, a pinion 56a is fixedly or integrally provided on the drive shaft 56. The pinion 56 a formed on the drive shaft 56 in this way meshes with the sector gear 8 b of the rotary blade 8 to drive the rotary blade 8.

At both ends of the rotary blade 8 are mounted springs 9 formed in a tooth shape 9a having substantially the same shape as the tooth shape of the sector gear 8b. In this case, the sector gear 8b and the spring 9
Is formed and attached as a series of tooth profiles. That is, first, the tooth shape 9a of the spring 9 is
6a and then the sector gear 8b meshes with the pinion 56a. Thus, the tooth profile 9 of the spring 9
When a is manufactured to have substantially the same shape as the tooth shape of the sector gear 8b and attached to the end, the tooth shape 9a of the spring 9 absorbs shock by its own elasticity when meshing with the pinion 56a, and
b and the pinion 56a function to induce smooth meshing.

FIG. 5 is a view of the electric cable cutter of FIG. 1 as viewed from behind, and shows a rotating state of the rotary blade 8 driven through the above-mentioned planetary reduction mechanism 5. The pinion 56
a meshes with the sector gear 8b and drives the rotary blade 8 to rotate. In this case, a large driving torque is generated in the pinion 56a as a result of the deceleration, so that the pinion 56a is placed between the fixed blade 7 and the rotary blade 8. Cables and the like are easily cut. In this embodiment, the rotary blade 8 forming the sector gear 8b is configured to be disengaged from the pinion 56a and re-engaged, during which the rotary blade 8 becomes free, and the cable or the like is moved in the direction of arrow R in FIG. Since the material to be cut can be inserted from the side, a long cable can be cut between the fixed blade 7 and the rotary blade 8 for cutting. If it is desired to reverse the rotary blade 8 in the middle of the cutting operation and return it to the original position, the reverse lever 3b on the lower side of the switch lever 3 in the handle portion is pressed, and the motor 2 reverses.

[0017]

Since the electric cable cutter of the present invention has the above-described structure, it can be easily operated with one hand even when the degree of freedom in high places is restricted during electric construction work or the like. In addition, cables and steel bars can be cut without the need for arm strength. Further, since the electric cable cutter is portable, it is portable and can be used freely in any place.

[Brief description of the drawings]

FIG. 1 is a front view of an electric cable cutter according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a longitudinal sectional view showing an internal structure of the planetary gear mechanism.

FIG. 4 is a part of a view taken in the direction of arrow Q in FIG. 3;

FIG. 5 is a rear view of the electric cable cutter of the present invention.

FIG. 6 is a schematic view of a conventional manual cutting machine for cutting cables and steel bars.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Electric motor 3 Switch lever 4 Switch 5 Planetary gear reduction mechanism 6 Gear case 7 Fixed blade 7a Blade 8 Rotating blade 8a Blade 8b Sector gear 9 Spring 9a Tooth 56a Pinion

Continuing on the front page (72) Inventor: Masashi Isobe 1 in Kinoshoin, Nishinosho, Inomaba-cho, Minami-ku, Kyoto, Japan Inside of Nippon Battery Co., Ltd. (72) Inventor: Shigeru Hirabayashi 3039, Sasaga, Matsumoto-shi, Nagano Pref. (56) References JP-A-5-146913 (JP, A) JP-A-63-23951 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23D 29/00

Claims (2)

(57) [Claims] An electric motor, a gear reduction mechanism of a pinion and a large gear driven by the electric motor, and driven through the gear reduction mechanism, parallel to the drive shaft direction of the electric motor. A multi-stage planetary gear reduction mechanism disposed in a gear case adjacent to the electric motor and adjacent to the electric motor, and on the same axis as the multi-stage planetary gear reduction mechanism and opposite to the position of the drive shaft of the electric motor. A pinion which is provided at a position on the side and is integrally provided on a drive shaft driven by the multi-stage planetary gear reduction mechanism, and a fixed blade fixed to a fixed portion of the gear case;
A rotary blade formed on an outer peripheral edge of a gear that is rotatably pivotally attached to the fixed blade and has a blade portion provided on a rib portion and a gear that meshes with a pinion integrally provided on a drive shaft driven by the multi-stage planetary gear reduction mechanism; And an electric motor driving source. 2. A gear formed on an outer peripheral edge of a rotary blade meshing with a pinion provided integrally with a drive shaft driven by the multi-stage planetary gear reduction mechanism is a sector gear. 2. The electric cable cutter according to item 1.