JPH0339684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to nail clippers, and more particularly to a nail clipper that allows the tip of a toe to be cut well by cutting.

[Prior Art and Problems to be Solved by the Invention] When cutting nails with a commonly used nail clipper, the tip of the nail is inserted between the upper and lower blades that face each other, and these blades are moved by the operating arm. The levers are used to press each other against each other, and the pressure from the double blades is used to cut the claws. When the nail is cut, the cutting edges of both blades collide with each other. Therefore, in general nail clippers, the cutting edge angle of each blade is set to a value above a certain value in order to maintain the strength of the cutting edge.
This is because if the edge of the blade is made too sharp, the blade will chip.

For this reason, in conventional nail clippers, the nails are not cut well and it is necessary to finish the nails with a file or the like. Furthermore, cutting requires a certain amount of operating force, which may make cutting the nails difficult, especially for sick and elderly people. If the operating arm is lengthened in order to weaken the cutting force, handling becomes inconvenient. Furthermore, when cutting, so-called deep nails and meat cuts are likely to occur, which is somewhat dangerous, and there is also the problem that the nail chips are scattered.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a nail clipper that can cut nails well and safely with a small amount of force and does not cause scattering of chips.

[Means for Solving the Problems and Their Effects] In order to achieve the above object, the first invention includes a cutting blade that is pressed against the tip edge of the claw, and a cutting blade that transmits finger force to the cutting blade. It is equipped with a drive mechanism that moves the fingertip, and a guide member consisting of a pair of guide rollers that move along the end of the fingertip and control the depth of cut of the cutting blade, and the cutting edge of the cutting blade is connected to the tip of the nail. Finish the edge with a curved surface in the nail thickness direction.
The tip edge of the cross section along the radial direction is recessed so as to form an arc shape, and the cutting blade abuts over the entire thickness of the nail tip edge, and the thickness direction of the nail tip edge. It is configured to have a finishing blade that comes into contact with the upper surface side.

When cutting nails according to the first invention having such a configuration, first, the guide member is applied to the fleshy part of the finger tip so that the cutting blade comes into pressure contact with the tip edge of the nail to be cut, and then the finger is applied. When the cutting blade is actuated by force via the drive mechanism, the nail is cut by the operation of the cutting blade, and a nail cutting operation is performed. At this time, the cutting action is performed well with a small finger operating force, and the tip surface of the claw after cutting is rounded with a curvature surface that follows the arc shape of the cutting blade. At the same time, the cutting surface is finished in a very clean state by the finishing blade.

A second invention also provides a cutting blade that is pressed against the tip edge of the fingernail, a drive mechanism that transmits a finger force to the cutting blade to perform a cutting motion, and a drive mechanism that moves the cutting blade along the end of the fingertip. and a guide member consisting of a pair of guide rollers for controlling the depth of cut of the drive mechanism. A transmission mechanism consisting of a finger operation section that moves backward, a transmission mechanism consisting of a meshing mechanism of rack teeth and pinion gears that transmits the moving force of the finger operation section to the cutting blade as rotational force, and a transmission mechanism that uses the forward force of the finger operation section. and an intermittent mechanism that brings the rack teeth of the transmission mechanism and the pinion gear into a meshing state, and brings the rack teeth and the pinion gear of the transmission mechanism into a non-meshing state by the return force of the finger operation part. It is configured.

When cutting nails according to the second invention having such a configuration, the finger pressing force is transmitted as rotational force to the cutting blade through a transmission mechanism consisting of a meshing mechanism of rack teeth and pinion gears, and the cutting blade is The cutting of the claws is performed by the rotational action of. If the finger pressing force is released at this time, the intermittent mechanism immediately disengages the rack teeth and pinion gear at any timing, such as during cutting, and the cutting blade rotates in the opposite direction. Cutting is prevented.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, a slender frame extending along the longitudinal direction of the main case 1 (indicated by a two-dot chain line) includes a main case 1 (indicated by a two-dot chain line) made of a cylindrical body with a flat cross section. 2 is accommodated.

As shown in FIG. 3, a disc-shaped cutting blade 3 is rotatably supported by a rotating shaft 31 at one end (lower end in the figure) of the frame 2 in the longitudinal direction. is adapted to be rotationally driven in the direction of the arrow by a drive mechanism described later.
This cutting blade 3 is disposed at a position where a part of its outer circumferential side surface almost coincides with the end face part of the main body case 1, and a part of the outer circumferential side face is located at the lower end face part of the main body case 1 in FIG. It is designed to be exposed to the outside through the formed opening.

A large number of cutting blades 4 are provided on the outer periphery of this cutting blade 3. Each of these cutting edges 4 is particularly
As shown in the figure, the cutting blade 4 is provided so as to extend in a direction substantially orthogonal to the circumferential direction of the cutting blade 3, that is, in the thickness direction of the cutting blade 3, and the cutting edge portion of each cutting blade 4 is used for cutting. It is recessed to have an arcuate cross section so that the tip edge of the claw has a curved surface. Therefore, the cutting blade 3 is attached to the main body case 1.
One side of the outside, which is close to the inner wall of the tube, has a large diameter, and one side of the inside, which is close to the inner wall, has a small diameter. Further, the cutting blade 4 has a cutting blade 41 that extends to the full thickness of the cutting blade 3, and a finishing blade 42 that extends to approximately half the thickness of the cutting blade 3 at the large diameter side portion of the cutting blade 3. It is formed from. The cutting blade 41 comes into contact with the entire thickness of the edge of the claw, while the finishing blade 42 comes into contact with the upper surface side of the end face of the claw.

Further, the cutting blade 3 is housed in a blade case 5 that stores chips discharged from the cutting blade 3. As shown in FIG. 3, this blade case 5 includes a chip receiving section 51 made of a U-shaped band member provided so as to surround the chamber containing the cutting blade 3, and a chip receiving section 51 as shown in FIG. As shown, the main body case 1 is formed of a lid part 52 which is provided at the end opening of the main body case 1 so as to be openable and closable. The chip receiving part 51
Both ends of the main body case 1 are installed so as to correspond to opposite sides of the end opening of the main body case 1, respectively.
In the chip receiving portion 51, chips from the claws are accumulated in order from the downstream side in the rotational direction of the cutting blade 3. The lid part 52 is disposed so as to span both end edges of the chip receiving part 51, and is a part of the main body case 1 so that the chips accumulated in the chip receiving part 51 can be disposed of outside. It is attached to the side edge via a hinge mechanism 53 so that it can be opened and closed. This lid portion 52 is connected to the main body case 1.
It only covers a part of the end opening of the lid part 5.
2 does not cover the opening, the cutting blade 3
A part of it is exposed to the outside. Further, a chip stopper 54 is provided at an end portion of the lid portion 52 corresponding to the downstream side in the rotational direction of the cutting blade 3, which is bent and extends in a dogleg shape toward the inside of the chip receiving portion 51. . The chips that accumulate in the chip receiving portion 51 are stopped by the chip stopper 54.

Further, in the vicinity of the cutting blade 3, two guide rollers 6, 6 are rotatably provided, which are moved along the end of the fingertip and control the amount of cutting of the cutting blade 3. These two guide rollers 6, 6 are
Adjacent to the inner surface of the cutting blade 3,
It is provided so as to sandwich it from both sides of the cutting blade 3, and its circumferential side surface is arranged at a position that substantially coincides with the outer circumferential surface of the cutting blade 3.

Furthermore, the rotating shaft 31 of the cutting blade 3 penetrates the frame 2 and protrudes to the opposite side, and a small-diameter driven gear 71 constituting the drive transmission mechanism 7 is attached to the protruding portion on the opposite side. There is. A first intermediate gear 72 having a large diameter is meshed with the drive gear 71, and a second intermediate gear 73 is meshed with the first intermediate gear 72. The second intermediate gear 73 is disposed approximately in the center of the frame 2, and its rotation axis 7
4 protrudes through the frame 2 to the opposite side, that is, the side where the cutting blade 3 is installed, and a small-diameter pinion drive gear 75 is attached to the protruding portion.

The pinion drive gear 75 is connected to the finger operating section 9 via an intermittent mechanism 8 that transmits driving force in one direction and cuts off driving force in the opposite direction.
That is, the pinion drive gear 75 is configured to mesh with the lock gear 81 of the disconnection mechanism 8. A rack guide body 80 having a U-shaped cross section is provided to cover the back of the rack gear 81. Furthermore, two pins 82, 82 are protruded from the back of the rack guide body 80 at a predetermined distance apart, and each of these pins 82, 82 is provided on the side of the frame 2 so as to extend in the longitudinal direction. The pins 82 are loosely fitted into the slots 82.
The head of the gear is in sliding contact with the upper surface of the opening edge of the slotted portion 83 with a constant frictional force.Thereby, the above-mentioned rack gear 81 is supported so as to be able to reciprocate in the longitudinal direction. It's becoming like that. Also, two pins 84, 84 are protruded from the side of the rack gear 81 at a predetermined distance apart, and each of these pins 84, 84 extends obliquely to the side of the rack guide body 80. They are loosely fitted into two elongated holes 85, 85 formed as shown in FIG. Each of the elongated holes 85, 85 is formed such that its lower portion in FIG. 1 extends toward the center, that is, toward the pinion drive gear 75. Therefore, when the rack gear 81 is moved downward in FIG. 1, the pin 84 is guided by the elongated hole 85, and the entire rack gear 81 is moved toward the center, that is, toward the pinion drive gear 75. , the rack gear 81 is meshed with the pinion drive gear 75. On the other hand, when the rack gear 81 is moved upward in FIG. 1, the pin 84 is guided by the elongated hole 85, and the entire rack gear 81 is moved to the outside, that is, to the side away from the pinion drive gear 75. The rack gear 81 is now disengaged from the pinion drive gear 75.

Further, an L-shaped base plate 91 constituting the finger operation section 9 is connected to the base end of the rack gear 81. This base plate 91 is connected to the above-mentioned rack gear 81.
After being bent at a substantially right angle from the base end of the frame 2, it extends in the width direction of the frame 2. A knob 92 that is pressed by a finger is fixed to the widthwise extending portion of the knob 92 so as to protrude to the outside of the main body case 1 . A guide groove 11 is formed in the main body case 1 to guide the knob 92 so as to reciprocate in the longitudinal direction. On the other hand, the frame 2 is formed with an end plate portion 22 that extends in the width direction at a portion that projects further upward in FIG. 1 than the base plate 91. Coil springs 93 and 94 are respectively attached between the end plate portion 22, the base plate 91 and the rack guide body 80, and the spring biasing forces of the coil springs 93 and 94 cause the rack gear 81 and the rack guide body 80 to The knob 92 is
It is designed to be constantly drawn to the upper side of Figure 1.

When cutting nails using this embodiment, as shown in FIG.
is pressed against the tip edge of the nail 10 to be cut. At this time, by applying the guide rollers 6, 6 to the flesh of the finger tips, the cutting depth of the cutting blade 3 can be controlled, and extremely smooth finger movement can be achieved by the small diameter rollers 6, 6. It happens. In this state, place your thumb on the knob 92 and press down on the knob 92. As a result, the finger pressing force is transmitted to the cutting blade 3 via the drive transmission mechanism 7, and the cutting blade 3
is rotated. The claw 10 is then cut by the rotation of the cutting blade 3.

In this type of cutting, the cutting action is performed well with a small operating force, and the end surface of the claw after cutting is finished in such a beautiful state that no finishing operation is required. becomes.

In particular, in this embodiment, the claw 10 is cut into a round shape with a curvature surface that follows the arc shape provided on the cutting edge portion 4 of the cutting blade 3, and at the initial stage,
The cutting blade 41 of the cutting blade 3 makes a cut, and the cutting surface is then finished by the finishing blade 42. Therefore, an extremely good finished state can be obtained with one cutting operation.

Also, when the knob 92 is released halfway or when it is pushed all the way down, the coil spring 93,
Due to the biasing force of the spring 94, the knob 92 is pulled upward in FIG. 6 and returned to its original position. At this time, the rack gear 81 of the disconnection mechanism 8 is immediately separated from the pinion drive gear 75 because the pin 84 on the rack gear 81 side is guided into the elongated hole 85 on the rack guide body 80 side. Therefore, in this case, no driving force is transmitted to the cutting blade 3, the cutting blade 3 is placed in a free state, and reverse rotation of the cutting blade 3 is prevented. In this way, by providing the intermittent mechanism 8 that transmits the forward operation force in one direction of the finger operation part and cuts off the backward operation force in the opposite direction, the cutting operation can be performed intermittently as appropriate. This allows the pawl to be cut according to one's preference, and since the rack gear and pinion gear are immediately separated during the return movement, the return movement is quick and unnecessary friction is avoided. It is highly durable as it does not cause any damage.

The chips of the claws cut out by the cutting operation of the cutting blade 3 are accumulated in the chip receiving part 51 of the blade case 5 that houses the cutting blade 3 in order from the downstream side in the rotational direction of the cutting blade 3. There is. At this time, the chips accumulated in the chip receiving portion 51 are stopped by a chip stopper 54 provided on the lid portion 52. This prevents chips from scattering to the outside. Moreover, by opening the lid part 52 outward, the chip receiving part 51 can be opened.
The chips stored inside are disposed of outside.

In the above embodiment, the cutting blade is configured in a disk shape, but a fan-shaped blade, a linear blade, or the like may also be adopted. Further, although a roller body is employed as the guide member, a fixed plate-shaped member or the like may also be employed. Furthermore, the lid for disposing of chips may be formed in the form of a drawer so that it can be opened and closed by being put in and taken out.

[Effects of the Invention] As described above, in the first invention, when cutting nails, the cutting blade is pressed against the tip edge of the nail to be cut by applying the flesh of the finger tip to the guide member. Since the nail was cut by operating the cutting blade through the drive mechanism using the finger force, the cutting action was performed well with a small finger force, and the nail was cut. The tip surface of the rear claw is roundly cut with a curvature surface that follows the arc shape of the cutting blade, and the cutting surface is finished in a very clean state by the finishing blade. Therefore, nails can be cut properly and safely with a small amount of force.

Furthermore, the second invention transmits the finger pressing force as a rotational force to the cutting blade through a transmission mechanism consisting of a meshing mechanism of rack teeth and pinion gears, and when the finger pressing force is released, there is Even when the timing is off, the intermittent mechanism immediately disengages the rack teeth and the pinion gear, which prevents the cutting blade from rotating in the opposite direction and allows it to return quickly, which also prevents unnecessary friction. It is highly durable because there is no Therefore, it is safer and moreover, the user can freely perform the nail cutting operation according to his/her preference.

[Brief explanation of drawings]

Figures 1 and 2 are front and back perspective views illustrating the inside of a nail clipper according to an embodiment of the present invention, and Figure 3 is one end of the nail clipper shown in Figures 1 and 2. Fig. 4 is a partially enlarged side view of the cutting blade, Fig. 5 is an enlarged perspective view showing the lid part, and Fig. 6 shows how to use the nail clipper shown in Figs. 1 and 2. It is a perspective view showing a state. 1... Main body case, 2... Frame, 3... Cutting blade,
4... Cutting blade, 41... Cutting blade, 42... Finishing blade, 5...
Blade case, 6... Guide roller, 7... Drive transmission mechanism, 8... Intermittent mechanism, 9... Finger operation section, 92... Knob,
93, 94...Coil spring.

Claims (1)

[Scope of Claims] 1. A cutting blade that is pressed against the tip edge of the fingernail, a drive mechanism that transmits finger force to the cutting blade to perform cutting motion, and a drive mechanism that moves along the edge of the fingertip to perform the cutting motion. a guide member consisting of a pair of guide rollers that controls the depth of cut of the cutting blade; The surface is formed into an arcuate concave shape, and the cutting blade includes a cutting blade that contacts the entire thickness of the nail tip edge, and a finishing blade that comes into contact with the upper surface side of the nail tip edge in the thickness direction. A nail clipper characterized by having and arranged side by side on the same outer peripheral surface. 2. A cutting blade that is pressed against the tip edge of the nail, a drive mechanism that transmits finger force to the cutting blade to perform cutting motion, and a drive mechanism that moves along the edge of the fingertip to control the depth of cut of the cutting blade. and a guide member consisting of a pair of guide rollers, and the drive mechanism is moved forward in one direction by the pressing force of a finger, and moved back in the opposite direction by the biasing force of a spring. A transmission mechanism consisting of a finger operation section, a meshing mechanism of rack teeth and pinion gears that transmits the moving force in the finger operation section to the cutting blade as rotational force, and a forward force of the finger operation section to transmit the above-mentioned transmission. and an intermittent mechanism that brings the rack teeth of the mechanism and the pinion gear into a meshing state, and brings the rack teeth and the pinion gear of the transmission mechanism into a non-meshing state by the return force of the finger operation part. A nail clipper featuring