JP2761862B2 - Manual cable cutter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual cable cutter capable of easily cutting various kinds of metal cables such as wire ropes, electric wires, communication wires, and reinforcing bars. It is related to the improvement of. 2. Description of the Related Art An example of a conventional cable cutter of this type is disclosed in Japanese Patent Publication No. 58-28049. Although not specifically shown, the basic structure of the conventional cutter includes a pair of handles whose upper portions are interconnected and urged in the expanding direction by a spring action, and one of the two handles is a fixed handle, Make the other a swing handle,
At the top of the fixed handle, the base of the fixed cutting blade is fixed, and at the tip of the fixed cutting blade, the base end of the revolving cutting blade having teeth formed continuously on the arcuate outer surface is axially mounted. The revolving cutting blade is configured to be revolvable around the shaft attachment portion. [0003] An operating lever having an engagement claw that meshes with the outer teeth of the revolving cutting blade is rotatably mounted on the upper portion of the swing handle so as to be rotatable. For the pushing operation of the operating lever, the turning cutting blade in the occlusion state is turned in the closing direction, that is, in the cutting direction of the cable. [0004] In actual use, the swivel cutting blade is opened, and a cable as a workpiece is inserted into a space defined between the swivel cutting blade and the fixed cutting blade.
The free end of the turning cutting blade is guided in the closing direction with the pivot point as a fulcrum, and the turning cutting blade and the fixed cutting blade completely surround the outer peripheral area of the cable. When the moving handle is continuously opened and closed, each time the swinging handle is opened and closed, the operating lever that engages its own engaging claw with the outer tooth portion of the rotating cutting blade is used for slipping and pushing operation of the operating lever. Since the blade automatically pivots until the space becomes zero, various metal cables are cut by the blades formed on the opposite side edges of the revolving cutting blade and the fixed cutting blade. Further, in such a conventional cutter, a configuration in which a base end portion of a revolving cutting blade is axially mounted on a distal end portion of a fixed cutting blade and a shaft mounting portion of both the cutting blades is set at the uppermost portion of the cutter body is as follows.
Because it is possible to cut the cable under the condition that the cable is completely surrounded by the fixed cutting blade and the turning cutting blade,
There is an advantage that a metal cable having a relatively large diameter can be cut. However, in a conventional cable cutter, an operating lever pivotally mounted on a swing handle is attached to a driving means for moving the rotary cutting blade in a closing direction. When only looking at the point where the turning cutting blade is moved in the closing direction and the cable is cut in conjunction with the opening and closing operation of the swing handle, the operating lever itself is the point where the cutting blades are attached to the shaft. And a cooperating point of the swing handle to form a so-called toggle mechanism, which has the advantage of providing a large shearing force to the revolving cutting blade with a relatively small force, but the adoption of such a toggle mechanism is However, there is a major structural disadvantage that the turning cutting blade cannot be forcibly returned in the opening direction while the metal cable is being cut. [0007] That is, in the cutting work of various metal cables, due to the cutting ability of the cutter and the hardness and diameter of the cable, even if the swing handle is opened and closed, the turning cutting blade closes in the middle of cutting even if it is operated. Unexpected troubles that make it impossible to make a turning movement often occur. Therefore, this type of cable cutter has a structure that can cope with such troubles very quickly, in other words, a structure that can easily remove the trouble cable by forcibly reversing the turning cutting blade in the opening direction. Although it is absolutely required, the conventional cutter, as described above, cannot forcibly reverse the revolving cutting blade in the event of a trouble, as described above. It has become a challenge. The conventional cable cutter is provided with a mechanism for releasing the engagement of the engaging claw of the operating lever with the outer teeth of the rotary cutting blade. However, this is only after the cutting is completed or after the cutting. Before the start, the swivel cutting blade is gripped by hand, and is used for swiveling in the opening direction, and is not for moving the swivel cutting blade in the reverse direction during cutting, so once a trouble occurs, In the case where the turning cutting blade is firmly cut into the metal cable, even if the engaging claw of the operating lever is released and the turning cutting blade is placed in a freely swivelable state, it is difficult to remove the hand. It is impossible at all to reverse this with only the force described above, and even if it could be done, extremely dangerous work would be required. SUMMARY OF THE INVENTION The present invention has been developed in order to effectively solve the problems of the conventional cable cutter, wherein the upper portions are connected to each other and are opened in the expanding direction by a spring action. A pair of biased handles, one of the handles being a fixed handle and the other being a swing handle,
The base of the fixed cutting blade is fixed to the upper part of the fixed handle, and the base end of the turning cutting blade having the teeth continuously formed on its arcuate outer surface at the distal end of the fixed cutting blade is pivotable. Assuming a manual cable cutter that cuts the cable while completely surrounding the cable with the turning cutting blade and the fixed cutting blade, a first gear that meshes with the outer tooth portion of the turning cutting blade on the fixed handle side. A second gear coaxially mounted on the first gear is provided, and a third gear meshing with the second gear is provided on the swing handle, and the third gear is moved in two directions, forward and reverse. A ratchet lever capable of switching to an occlusal state is provided, and the forward / reverse switching of the ratchet lever causes the third gear to rotate forward / reverse with the ratchet lever in accordance with the opening / closing operation of the swing handle, thereby reducing the rotational force of the third gear. Coaxial first tooth from second gear Through, without a structure for transmitting to the turning cutting blade, and adopts the configuration in which the reverse rotation preventing claw that can be switched to the occlusion and a neutral state to the third gear. Therefore, in the present invention, the ratchet lever is switched to the reverse biting state with respect to the third gear, and at the same time, the reverse rotation preventing pawl is switched to the neutral state, so that the first to third gears are rotated. After ensuring the free rotation state, simply by opening and closing the swing handle, the rotational force of the third gear is transmitted from the second gear to the revolving cutting blade via the coaxial first gear, and Since it becomes possible to automatically pivot the cutting blade in the reverse direction, it is possible to remove the cable from between the rotating cutting blade and the fixed cutting blade,
Trouble can be solved immediately. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention. As shown in FIGS. 1 to 5, the manual cable cutter according to the present embodiment includes a pair of handles that are urged in the expanding direction by a spring action, and one of the handles is a fixed handle 1 and the other is a fixed handle. As the swing handle 2 and above the fixed handle 1,
A wide base 3a of the fixed cutting blade 3 is fixed, and a shaft 7 is attached to the tip of the fixed cutting blade 3 at the base end of the revolving cutting blade 4 having teeth 4a continuously formed on its arcuate outer surface. Each of the cutting blades 3 and 4 is pivotally mounted on the respective cutting blades in a state where the cable is completely surrounded by the rotary cutting blade 4 and the fixed cutting blade 3.
Are cut by the receiving blade portion 5 and the pressing blade portion 6 formed on the opposite side edge of the blade. The upper front sides of the fixed handle 1 and the swing handle 2 are connected via a rectangular cover plate 8 having a bent wall 8a on one side. As for the relationship, the two members 1 and 8 are fixed with the screw member 9, and in the relationship with the swing handle 2, the two members are swingably connected via the shaft 10. The blades 3 are connected by a wide base 3a.
The relationship with the wide base 3a is also fixed by fixing the fixed handle 1 with the screw member 9 in the same manner, and connecting the swing handle 2 via the shaft 10 so as to swing. A structure capable of opening and closing the fixed handle 1 is adopted. In the present embodiment, the outer tooth portion 4a of the revolving cutting blade 4 is directly engaged with the fixed cutting blade 3 near the fixed handle 1 between the wide base 3a of the fixed cutting blade 3 and the cover plate 8. A first small gear 11 and a second large gear 12 which is coaxially mounted on the first small gear 11 are provided.
A third small gear 15 meshing with the second large gear 12 via the shaft 10 can be rotated on the swing handle 2 extending between the wide base 3a of the fixed cutting blade 3 and the cover plate 8. And a ratchet lever 16 which can switch the third small gear 15 into a forward and reverse two-way engagement state. The ratchet lever 16 is, in particular,
As is apparent from FIG. 5, the outer part comprises an outer part and an inner part, the outer part operably protrudes outward from a notch 8b formed in the bent wall 8a of the cover plate 8, and the inner part is a support shaft 17 The push nail 16a and the other push nail 16b, which are rotatably mounted on the upper part of the swing handle 2 via the shaft and rotatably connected to the teeth of the third small gear 15 at the end and the middle thereof, are fixed to each other. A V-shaped projection 16c is formed on the rear surface side of the shaft mounting portion at an interval, and the rear surface side having the projection 16c is connected to a bearing 18 provided in the swing handle 2 and a spring. 19 and pressed. Accordingly, when the ratchet lever 16 is rotated to engage and lock the bearing 18 on one side surface of the projection 16c, only the one pressing claw 16a meshes with the teeth of the third small gear 15. Then, the ratchet lever 16 is placed in the positive engagement state with the third small gear 15, and conversely, when the ratchet lever 16 is rotated to engage and lock the bearing 18 with the other side surface of the projection 16c, this time, Can only switch the ratchet lever 16 to the opposite bite state with the third pinion gear 15 because only the other pressing claw 16b is meshed with the teeth of the third pinion gear 15. By simply switching between the forward and reverse directions and opening and closing the swing handle 2, the third small gear 15 can be automatically rotated in two forward and reverse directions. The other pressing claws 16 of the ratchet lever 16
b is engaged with the third small gear 15,
When the swing handle 2 is closed, the push claw 1
6b slips on the third small gear 15, and the swing handle 2
Is allowed, and only at the time of the opening operation, the third small gear 15 is pushed by the push claw 16b in the predetermined direction. Further, the cable cutter according to the present embodiment includes a reverse rotation preventing claw 20 which meshes with the third small gear 15 to prevent reverse rotation thereof. The reverse rotation preventing claw 20 is rotatably mounted on the wide base portion 3a of the fixed cutting blade 3 via a shaft 21 as shown in the drawing, and is mounted on the shaft 21 to bend the wall of the cover plate 8. The spring pressure of the torsion spring 22 interposed between the gears 8a constantly elastically urges the third small gear 15 to engage. In addition to this,
0, a pressing piece 23 is rotatably mounted on a shaft 24 via a shaft 24, and the wide base 3a of the fixed cutting blade 3 of the shaft 24.
An operation lever 25 for rotating the pressing piece 23 in a predetermined direction is integrally fixed to a tip projecting from the front end. Therefore, when the operating end 23a of the pressing piece 23 is rotated in a direction away from the side surface of the reverse rotation preventing claw 20 by the rotation operation of the operation lever 25, the reverse rotation preventing claw 20 is Is engaged with the teeth of the third small gear 15 by the spring pressure of
Although the reverse rotation of the third small gear 15 is surely prevented, when the third small gear 15 rotates in the forward direction, the rotation of the third small gear 15 is allowed in a slipping state. .
Conversely, the operation lever 25 is rotated to operate the pressing piece 23.
When the reverse rotation preventing claw 20 is pressed against the spring pressure of the torsion spring 22 at the working end 23a, the reverse rotation preventing claw 20 is forcibly disengaged from the teeth of the third small gear 15 and the third small gear 15 Can be switched to the neutral state. From the above configuration, under the present embodiment,
At the same time, the ratchet lever 16 is switched to the reverse biting state with respect to the third small gear 15, and
When 0 is also switched to the neutral state by the pressing piece 23,
The forward and reverse free rotation of the second large gear 12 and the first small gear 11 as well as the third small gear 15 can be ensured. In this state, the swinging handle 2 can be turned only by opening and closing. This makes it possible to forcibly turn the cutting blade 4 in the reverse direction. In the drawing, reference numeral 26 denotes a drum-shaped coil spring for urging the pair of handles 1.2 in the expanding direction, and reference numeral 27 denotes a lock member for locking the pair of handles 1.2 in a closed state when not in use. By engaging the lock member 27 provided on the fixed handle 1 in the lock groove 28 of the swing handle 2 against the spring pressure of the coil spring 26, the pair of handles 1 and 2 can be moved. Can be kept closed and not in use. Therefore, when cutting a metal cable (not shown) using the manual cable cutter having such a configuration, as shown in FIG. While the switch is set to the occlusion state with respect to 15, one pressing claw 16 a of the ratchet lever 16 is also occluded with the third small gear 15, and the ratchet lever 16 is set to the occlusion state in the forward direction. Next, the turning cutting blade 4 is opened, a cable is inserted into a space S defined between the turning cutting blade 4 and the fixed cutting blade 3, and then the free end of the turning cutting blade 4 is set. Part is guided between the cover plate 8 and the wide base 3a of the fixed cutting blade 3,
After the outer peripheral area of the cable is completely surrounded by the revolving cutting blade 4 and the fixed cutting blade 3, the pair of handles 1 and 2 are gripped and the swing handle 2 is opened and closed to open and close the swing handle 2. Each time, with one pressing claw 16a of the ratchet lever 16,
The third small gear 15 rotates in the arrow direction (positive direction) in the figure. Then, by the rotation of the third small gear 15, the second large gear 12 rotates, and at the same time, the first small gear 11 coaxial with the second large gear 12 also rotates in the direction of the arrow in FIG. Since the revolving cutting blade 4 that engages the outer tooth portion 4a of the first pinion 11 with the first small gear 11 is automatically revolved in the closing direction where the space S is zero, the cable is connected to the revolving cutting blade 4. It is easily cut by the pressing blade 6 and the receiving blade 5 of the fixed cutting blade 3. If a trouble occurs in the course of cutting the cable and the subsequent cutting cannot be continued,
Next, as shown in FIG. 5, the reverse rotation preventing claw 20 is switched to a neutral state with respect to the third small gear 15 by the pressing action of the pressing piece 23 accompanying the operation of the operation lever 25, and each gear 1
After the free rotation state of 5, 12, and 11 is ensured, the other pressing claw 16b of the ratchet lever 16 is engaged with the third small gear 15, and the ratchet lever 16 is switched and set to the opposite engagement state. Then, in such a switching set state,
When the swinging handle 2 is continuously opened and closed by holding the pair of handles 1 and 2, each time the swinging handle 2 is opened and closed, the ratchet lever 16 is used to push another pushing claw 16 b. , The third small gear 15 is in the direction of the arrow in the drawing (reverse direction).
Rotate automatically. Then, by the reverse rotation of the third small gear 15, the second large gear 12 rotates, and at the same time, the first small gear 11 coaxial with the second large gear 12 also rotates in the direction of the arrow in the figure. Then, since the turning cutting blade 4 for engaging the outer tooth portion 4a of the first pinion 11 with the first pinion 11 is automatically turned this time in the reverse opening direction, the opening and closing operation of the swing handle 2 causes If the revolving cutting blade 4 is automatically opened, the cable can be easily removed from between the two cutting blades 3 and 4, and the trouble can be eliminated immediately. In particular, in the present embodiment, the swing cutting blade 4 is automatically opened and closed by the opening and closing operation of the swinging handle 2 similar to the cable cutting work. It has the advantage of being extremely rational and safe. As described above, according to the present invention, the first gear meshing with the outer tooth portion of the revolving cutting blade on the fixed handle side, and the second gear coaxially mounted on the first gear are provided. On the other hand, a third gear that meshes with the second gear on the swing handle side, a ratchet lever that can be switched to a normal and reverse two-way meshing state with the third gear, and a meshing state that is neutral with the third gear. It is characterized by having provided a reverse rotation preventing claw that can be switched to a state, so that the reverse rotation preventing claw and the ratchet lever are each switched and set to a desired state in advance, and then a pair of handles are gripped, and a swing handle is , It is possible to easily cut any kind of metal cable with the turning cutting blade and the fixed cutting blade. In addition, if a trouble occurs in the process of cutting the cable and the subsequent cutting cannot be continued, the ratchet lever is switched to the third gear in the reverse direction. At the same time, the anti-reverse pawl is switched to the neutral state to ensure the free rotation of each gear, and then the swing cutting blade can be automatically turned in the reverse direction only by opening and closing the swing handle. As a result, the cable can be removed from between the two cutting blades, and the trouble can be safely and immediately eliminated. Therefore, according to the present invention, it is possible to provide, for the first time, an extremely convenient manual cable cutter which solves the problem in use of the conventional cutter. In addition, the present invention makes it possible for the first time to forcibly return the revolving cutting blade described above for the first time, without using any conventional toggle mechanism and basically using a gear movement mechanism. Needless to say, by appropriately selecting the diameter ratio, the number of teeth, and the like of each gear, not only can the shear force according to the cut cable be set freely, but at the same time, the intermittent rotation of the third gear can be performed. By adjusting the feed amount, there is also an advantage that the rotation amount of each gear in one opening and closing operation of the swing handle, in other words, the cutting amount of the cable can be freely set.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a manual cable cutter according to an embodiment of the present invention. FIG. 2 is a rear view of the cable cutter. FIG. 3 is a side view of the cable cutter. FIG. 4 is an enlarged cross-sectional view of a main part showing a state of engagement between a ratchet lever and a reverse rotation preventing claw in a forward direction and a related structure thereof. FIG. 5 is an enlarged sectional view of a main part showing a state in which the ratchet lever is engaged in a reverse direction, a neutral state of the reverse rotation preventing claw, and a related structure thereof. DESCRIPTION OF SYMBOLS 1 Fixed handle 2 Swing handle 3 Fixed cutting blade 3a Wide base of fixed cutting blade 4 Turning cutting blade 4a Outer tooth portion of turning cutting blade 8 Cover plate 11 First small gear (first gear) 12 Second large gear (second gear) 13 Coaxial 15 Third small gear (third gear) 16 Ratchet lever 16a One push pawl 16b of ratchet lever Another push pawl 16c of ratchet lever Projection 18 of ratchet lever 18 Bearing 19 Spring Reference Signs List 20 reverse rotation preventing claw 22 torsion spring 23 pressing piece 25 operating lever 26 coil spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23D 29/00

Claims (1)

(57) [Claims] It has a pair of handles which are connected to each other and urged in the expanding direction by a spring action, one of the two handles being a fixed handle and the other being a swing handle, and a fixed cut is provided at the upper part of the fixed handle. While fixing the base of the blade, the base end of the revolving cutting blade having teeth formed continuously on its own arc-shaped outer surface is pivotally attached to the tip of the fixed cutting blade so as to be revolvable, and the cable is revolved. In a manual cable cutter for cutting in a state of being completely surrounded by a cutting blade and a fixed cutting blade, a first gear that meshes with an outer tooth portion of a revolving cutting blade on a fixed handle side, and is axially mounted coaxially with the first gear. While providing the second gears respectively provided, a third gear meshing with the second gear is provided on the swing handle side, and a ratchet lever capable of switching the third gear into a normal and reverse two-way meshing state is provided. , The ratchet lever In the forward / reverse switching, the third gear is rotated forward / reverse by the ratchet lever in accordance with the opening / closing operation of the swing handle, and the turning force of the third gear is transferred from the second gear through the first coaxial gear, and A manual cable cutter, wherein the cable is not transmitted to a cutting blade, and a reverse rotation preventing claw is provided for the third gear so as to switch between an engaged state and a neutral state.