JP6677691B2 - Adjustable nail clippers - Google Patents

Description

  The present invention relates to a nail clipper for cutting nails of hands and feet, and more particularly, to a blade-adjusting nail clipper having a function of adjusting an initial blade distance stepwise.

  A conventional general nail clipper has an upper plate and a lower plate in which two metal long plates are vertically opposed and a rear end is joined so as to form a forked shape, and a front end of each plate. A support shaft that penetrates each of the openings provided in the vicinity, is rotatable with respect to each plate, and is prevented from falling off with respect to the lower plate, and a diameter direction of the support shaft at an upper end portion of the support shaft. An operating handle rotatably supported as a rotation axis.

  Then, the front end of each plate is bent into a substantially L-shape so that the front ends thereof are opposed to each other, and the front ends are sharpened to form upper blades and lower blades, respectively. A gap is provided between the two to insert the tip of the fingernail.

  The operating handle further includes a fulcrum projection projecting from one surface of the front end portion, and the fulcrum projection is brought into contact with a part of the front end portion of the upper surface of the upper plate to perform a pressing operation. The front ends of the pair of bullets are elastically closed by leverage through the upper blade and the upper blade and the lower blade push the claw completely. Therefore, at least one of the upper plate and the lower plate has elasticity.

  In some cases, a cover for preventing scattering of cut nail waste is attached to the side surfaces of the upper plate and the lower plate.

  In such a configuration, when cutting the nail of the hand or foot, by pushing the rear end of the operation handle down to the upper plate side with the tip of the finger nail inserted in the gap between the upper blade and the lower blade, The tip of the nail is cut between the upper blade and the lower blade.

  At this time, it is used by positioning while visually checking the depth of the nail to be cut, but when cutting the nail of the foot, or when cutting the nail of another person, such as assistance for the elderly and children, etc. In addition, it is difficult to confirm the cutting position, and furthermore, there is a possibility that the cutting position shifts due to the hand being deviated before the operation handle is pressed down, resulting in deep nailing or damage to the meat portion.

  In view of such a problem, in order to prevent the flesh portion of the fingertip from invading into the space between the blades, the initial distance between the blades, which is the gap between the upper blade and the lower blade, is adjusted according to the size of the nail of the user. Nail clippers that can be adjusted appropriately have been developed.

  For example, the upper blade and the lower blade are formed by forming threads on the outer peripheral surface of the support shaft and the inner peripheral surface of the opening of the lower plate, screwing them together, and rotating the support shaft with the operation handle. (Patent Literature 1: Registered Utility Model No. 3161973) has been disclosed.

  Also, a thread is formed on the outer peripheral surface of the support shaft, a nut is provided on the lower surface side of the lower plate, screwed with the support shaft, and the support shaft is displaced with respect to the lower plate by screwing the nut, A nail clipper that adjusts the distance between the upper blade and the lower blade has been disclosed (Patent Document 2: Japanese Utility Model Laid-Open No. 2-138609).

  The nail clipper as described above has an advantage that it can be finely adjusted in a stepless manner because the nail clipper is driven by screwing, but the caregiver cuts the nails of a plurality of care recipients, and the like. When the adjustment between the blades is performed each time according to the user, it is inefficient because of lack of repeatability.

  On the other hand, the present applicant has a knob receiving portion which is coaxial with the support shaft and is fixed to the lower surface of the lower plate, and a knob which is opposed to the knob receiving portion in the vertical direction. There is disclosed a nail clipper in which a tread surface of a spiral staircase formed and an upwardly projecting protrusion formed on a knob are in contact with each other (Patent Document 3: Registered Utility Model No. 3205053, No. 3). Embodiment).

  This nail clipper restricts the movement of the knob in the axial direction with respect to the support shaft, and by rotating the knob, the protrusion moves up and down the spiral staircase and moves relative to the knob receiving portion and the lower plate. The support shaft and the upper plate are vertically displaced together with the knob to adjust the distance between the upper blade and the lower blade. Then, in order to adjust the inter-blade distance stepwise, by recording an arbitrary number of steps for each user or care receiver, it is possible to improve repeatability.

  However, in the case of the above-mentioned nail clipper, particularly when the side of the spiral staircase is rounded to form the protrusion so that the spiral staircase can easily ascend the spiral staircase, the protrusion is formed from the boundary between the tread surfaces of the spiral staircase. There is a risk of falling off unexpectedly. In order to prevent this, if the elastic modulus of the upper plate and / or the lower plate is increased, a large force is required when turning the knob or pressing down the operation handle, which not only hinders operability, Further, the frictional force between the protrusion and each tread surface may increase, which may promote wear of each component.

Registered Utility Model No. 3161973 Japanese Utility Model Publication No. 2-138609 Registered Utility Model No. 3205053

  Therefore, the present invention has been made in view of the above-described circumstances, and is adapted to various users and usage situations, and at the same time, while ensuring stability in a handle at the time of use, a stage having excellent repeatability and operability. It is an object of the present invention to provide an adjustable inter-blade adjusting nail clipper.

  In order to solve the above-mentioned problem, the blade adjusting claw cutter according to the present invention has a thick cylindrical shape in which a lower surface of a support shaft has an upper surface fixed to a lower surface of a lower plate and a lower surface formed in a spiral surface. And a knob rotatably supported by the support shaft and having a projection that is provided below the knob receiving portion and that is projected upward so as to oppose the position of the center diameter on the spiral surface. With the rotation of the knob, the tip of the protrusion slides on the spiral surface, whereby the relative distance between the knob receiving portion and the knob is displaced, and the initial inter-blade distance is adjusted, Further, a plurality of recesses are formed at the position of the center diameter on the spiral surface, and when the tips of the projections face the recesses, the tips of the projections bite into the recesses, and the knob is turned. It is designed to be locked to the knob receiving portion.

  As described above, the initial blade distance, that is, the distance on the support shaft between the upper plate and the lower plate is changed by changing the relative distance between the knob receiving portion and the knob as the knob is rotated. At this time, since the protrusion formed on the knob slides on the spiral surface formed on the knob receiving portion, the spiral staircase as in the third embodiment of Patent Document 3 is moved up and down. Compared with, the smoothness of the knob operation is remarkably improved.

  Further, since a plurality of concave holes are provided on the spiral surface and the projections are bitten in stepwise, if a scale or the like is provided on the exterior of the knob so that each position locked in each concave hole can be recognized. By recording the best position according to the user and the part to be used, it is possible to quickly adjust to the best inter-blade distance when repeatedly used.

FIG. 2A is a plan view, FIG. 2B is a right side view, and FIG. It is a longitudinal section showing (a) at the time of the maximum of the distance between blades, and (b) at the time of the minimum of the distance between the blades in the embodiment of the inter-blade adjusting nail clipper according to the present invention. 1A is an assembly view, and FIG. It is (a) top view, (b) side view, (c) bottom view, (d) expanded sectional view in the center diameter of the knob receiving part in embodiment of the inter-blade adjusting nail clipper according to the present invention. . It is (a) a top view, (b) one side sectional drawing, (c) bottom view, and (d) one side sectional view of a knob in an embodiment of an inter-blade adjusting nail clipper according to the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following examples are merely preferred embodiments of the present invention, and the technical scope of the present invention is not limited to the following examples.

  1 and 2 includes an upper plate 2 forming an upper blade 21 at a front end, a lower plate 3 forming a lower blade 31 at a front end, a handle cover 4, and a support shaft. 5, an operation handle 6, a pin 7, a knob receiving portion 8, and a knob 9.

  The upper plate 2 and the lower plate 3 are long plates of metal having elasticity, respectively, are arranged vertically facing each other, and their rear ends are joined so as to form a bifurcated shape. The front end portion is always urged in the opening direction by the elasticity of the lower plate 3.

  The upper plate 2 is bent downward at its front end, and the upper end thereof is sharpened to form the upper blade 21. Similarly, the lower plate 3 is bent upward at its front end, and the tip thereof is sharpened to form the lower blade 31, and the tip of the fingernail is inserted between the lower plate 3 and the upper blade 21. A gap is provided.

  A substantially cylindrical support shaft 5 penetrates through each of the openings (not denoted by reference numerals) provided near the front ends of the upper plate 2 and the lower plate 3.

  The support shaft 5 is provided so as to be slidable in the axial direction with respect to the upper plate 2 and the lower plate 3 and rotatable around the shaft, and a lower end thereof supports a knob 9 described later. A flange portion 51 is formed to prevent the shaft portion 5 from coming off from the upper side.

  In the vicinity of the upper end of the support shaft 5, a pin 7 having a rotation axis in the diametric direction of the support shaft 5 is pivotally supported, and further via the pin 7, the operation handle 6 is pivotably pivoted with respect to the support shaft 5. Is tied.

  The operation handle 6 forms a fulcrum projection 61 protruding from one surface of the front end thereof, and presses the fulcrum projection 61 downward by contacting a part of the front end of the upper surface of the upper plate 2. Thus, the upper plate 2 is pushed down along the support shaft 5 by leverage via the fulcrum.

  Further, a hooking hole 62 is formed at the distal end side of the operation handle 6 so that the rear end of the operation handle 6 can be hooked and stored on a hook or the like provided on a wall in a state where the rear end is inclined forward.

  In addition, like the nail clipper of Patent Document 3 (registered utility model No. 3205053), the rear end of the operation handle 6 is attached to the upper plate 2 with the fulcrum 61 for the fulcrum of the operation handle 6 facing upward. By pressing down, the operating handle 6 can be stored along the upper plate 2.

  As shown in FIG. 3, a thick cylindrical knob receiving portion 8 coaxial with the support shaft 5 is fixed to the lower surface near the front end of the lower plate 3, and the lower side and the side of the knob receiving portion 8 are further fixed. A substantially cylindrical knob 9 whose lower end is substantially closed is disposed so as to cover the knob. At this time, the inner diameter of the knob 9 is formed slightly larger than the outer diameter of the knob receiving portion 8 so that the knob 9 can rotate with respect to the knob receiving portion 8.

  The knob receiving portion 8 and the knob 9 have through holes 81 and 91 at their centers (see FIGS. 4 and 5 and the like). The support shaft 5 is provided in an opening (not given a reference number) provided near the front end of the lower plate 3 and the through holes 81 and 91, and the knob 9 is supported by the flange 51. The knob receiving portion 8 and the knob 9 are pressed against each other by being pressed against the flange portion 51 and the lower plate 3.

  As shown in FIG. 4, the knob receiving portion 8 is formed in a substantially thick cylindrical shape having a through hole 81 through which the support shaft 5 is inserted at the center.

  The upper surface of the knob receiving portion 8 is formed in a planar shape so as to be joined to the lower surface of the lower plate 3. For example, the grip receiving portion 8 and the lower plate 3 are provided with gripping claws and holes for fitting the same. And so on.

  The lower surface of the knob receiving portion 8 forms a normal spiral surface 82, and a locking projection of a knob 9 described later is provided at a position of a center diameter (indicated by a dashed line in FIG. 4C) on the normal spiral surface 82. Nine locking recesses 83a to 83i with which the tips of 92 are engaged are recessed at equal intervals.

  Further, in the vicinity of the boundary between the lowermost portion and the uppermost portion of the normal spiral surface 82, the lowermost locking recess 83a and the uppermost locking recess 83i among the locking recesses 83a to 83i. A lower end locking portion 84 and an upper end locking portion 85 each having a C-shape are formed on the boundary side so that a locking projection 95 described later does not reach the boundary portion.

  As shown in FIG. 5, the knob 9 closes a large-diameter cylindrical portion 92 and a small-diameter cylindrical portion 93 coaxial with the support shaft 5 and lower ends of the cylindrical portions 92, 93 and has a circumferential direction on the lower surface thereof. It is mainly composed of a scale plate 94 engraved with numbers 1 to 9 at respective positions divided into nine portions, and one locking projection 95 formed on the upper surface of the scale plate 94 and protruding upward.

  Then, as shown in FIG. 3, the through hole 81 of the knob receiving portion 8 and the outer surface of the small-diameter cylindrical portion 93 of the knob 9 face each other, and the outer surface of the knob receiving portion 8 and the large-diameter cylindrical portion 92 of the knob 9 correspond to each other. The large-diameter cylindrical portion 92, the small-diameter cylindrical portion 93, and the scale plate 94 such that the inner side faces each other, and the center diameter of the normal spiral surface 82 of the knob receiving portion 8 and the tip of the locking projection 95 of the knob 9 face each other. A knob receiving portion 8 is provided in a portion surrounded by the upper surface of the knob.

  That is, the knob 9 is rotatable around the axis with respect to the knob receiving portion 8 and is movable up and down in the axial direction. As described above, the knob receiving portion 8 and the knob 9 are connected to the flange portion 51 and the lower plate 3. When the knob 9 is rotated, the locking projection 95 slides on the center diameter of the knob receiving portion 8 on the normally spiral surface 82 of the knob receiving portion 8 because the knob 9 is rotated. The knob 9 and the support shaft 5 move up and down relatively to the receiving portion 8.

  Then, when the tip of the locking projection 95 of the knob 9 reaches one of the locking recesses 83a to 83i formed on the center diameter of the knob receiving portion 8 in the normal spiral surface 82, the locking recesses 83a to 83i are formed. The knob 9 is locked inside the knob receiving portion 8.

  Further, when the knob 9 is rotated, the tips of the locking projections 95 are disengaged from the locking recesses 83a to 83i, slide on the normal spiral surface 83, and then into the adjacent locking recesses 83a to 83i. Then, the knob 9 is locked again with the knob receiving portion 8.

  At this time, the diameter of the locking projection 95 is larger than the diameter of the locking recesses 83a to 83i, and the tip of the locking projection 95 is rounded so that the locking projection 95 can be easily removed from the locking recesses 83a to 83i. Has formed.

  In this embodiment, when each of the locking recesses 83i, 83h,..., 83b, 83a bites into the locking projection 95, "1", "2",. , “8”, and “9” indicate the protrusions 41 (see FIG. 1C), so that a locking projection 95, a normal spiral surface 82, and locking recesses 83a to 83i are formed. .

  The relative distance between the knob 9 and the knob receiving portion 8 is smallest when the locking projection 95 is "1" in the locking recess 83i, and is "9" when the locking projection 95 is in the locking recess 83a. Sometimes the largest.

  The upper plate 2 is constantly urged upward, and moves up and down with respect to the knob receiving portion 8 and the lower plate 3 following the knob 9 and the support shaft 5, so that the upper blade in a state where the operation handle 6 is not pressed is provided. The initial distance between the blade 21 and the lower blade 31 is the largest when the locking projection 95 is “1” in the locking recess 83i, and the minimum when the locking projection 95 is “9” in the locking recess 83a. Become.

  In the present embodiment, the helical surface facing the locking projection 92 is the normal helical surface 91. However, by changing the inclination angle, for example, the displacement of the blade-to-blade distance can be changed by the scale plate “1”. It is also possible to set an interval of 0.25 mm between "6" and "6" and an interval of 0.6 mm between "6" and "9".

  The present invention secures stable safety even in various users and usage conditions, and records an appropriate graduation position according to the user and the site of use, so that complicated fine adjustments can be made when using repeatedly. It can be used comfortably and quickly without the need for multiple people, such as when cutting nails of infants and care receivers, as well as nails of their own hands and toes. It can also be usefully used.

REFERENCE SIGNS LIST 1 inter-blade adjusting nail clipper 2 upper plate 31 upper blade 3 lower plate 31 lower blade 4 handle cover 41-shaped protrusion 5 support shaft 51 flange 6 operation handle 61 fulcrum for fulcrum 7 pin 8 knob receiving portion 81 through hole 82 Regular spiral surfaces 83a to 83i Locking recessed hole 84 Lower end locking portion 85 Upper locking portion 9 Knob 91 Through hole 92 Large diameter cylindrical portion 93 Small diameter cylindrical portion 94 Scale plate 95 Locking projection

Claims (3)

An upper plate and a lower plate each having a rear end joined and a front end urged in an opening direction,
An upper blade formed at the tip of the upper plate,
A lower blade formed at the tip of the lower plate and cutting a nail between the upper blade,
A spindle that penetrates an opening provided on the front end side of the upper plate and the lower plate,
A knob rotatably supported at an end of the support shaft on the lower plate side ,
An operation handle that is swingably coupled to an end of the support shaft on the upper plate side, and is pivoted to one side so that the upper plate is pushed down to the lower plate side;
Provided between the knob and the lower plate, the relative distance between the knob is changed by rotating the knob, the initial inter-tooth distance between the upper blade and the lower blade is adjusted Knob bearing and
With
The knob bearing has a helical surface that faces the knob and is helical along the rotation circumferential direction of the knob,
On the spiral surface, a plurality of recesses are formed at intervals in the rotation circumferential direction of the knob,
The knob has a protrusion that projects toward the spiral surface side and fits into the concave hole, and the knob is rotated so that the protrusion comes out of the one concave hole. By sliding and fitting into the other holes, the initial inter-tooth distance is adjusted ,
The portion of the protrusion that fits into the concave hole, and the portion of the concave hole where the protrusion fits are formed in spherical shapes with each other,
An inter-blade adjusting nail clipper , wherein an outer diameter of a spherical portion of the projection is set to be larger than an inner diameter of the spherical portion of the concave hole . An upper plate and a lower plate each having a rear end joined and a front end urged in an opening direction,
An upper blade formed at the tip of the upper plate,
A lower blade formed at the tip of the lower plate and cutting a nail between the upper blade,
A spindle that penetrates an opening provided on the front end side of the upper plate and the lower plate,
A knob rotatably supported at an end of the support shaft on the lower plate side,
An operation handle that is swingably coupled to an end of the support shaft on the upper plate side, and that the upper plate is pushed down to the lower plate side by being swung to one side;
Provided between the knob and the lower plate, the relative distance between the knob is changed by rotating the knob, the initial inter-tooth distance between the upper blade and the lower blade is adjusted Knob bearing and
With
The knob bearing has a helical surface that faces the knob and is helical along the rotation circumferential direction of the knob,
On the spiral surface, a plurality of recesses are formed at intervals in the rotation circumferential direction of the knob,
The knob has a projection that protrudes toward the spiral surface side and fits into the concave hole, and the knob is rotated, and after the protrusion comes out of the one concave hole, the knob moves on the spiral surface. By sliding and fitting into the other holes, the initial inter-tooth distance is adjusted,
At the bottom of the concave hole, a second concave hole whose side in the same direction as the concave hole is opened is formed,
An inter-blade adjusting nail clipper, wherein a tip of the projection is disposed inside the second recess while the projection is fitted into the recess.   3. The inter-blade adjusting nail clipper according to claim 1, wherein an indication indicating which of the plurality of the concave holes the protrusion is fitted with is provided on the knob. 4.

Images