JP2018094093A - Pivotal shaft structure for scissors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pivotal shaft structure for scissors that improves the feeling of use by a user by reducing a quantity of its jumping out from a blade body surface.SOLUTION: A coil spring 6 is fitted by being inserted such that a shaft part 4a of a shaft member 4 and a shaft part 5a of a shaft member 5 face respective through-holes 2c in respective blade bodies 2, and in a state of being mutually threadedly engaged and connected, one end contacts with a head part 4b of the shaft member 4 and the other end contacts with one blade body 2 so that both the blade bodies 2 are sandwiched between a head part 5b of the shaft member 5 and the coil spring via energization force. The head part 4b comprises a disk part 4c extending outwardly in a radial direction from a base end of the shaft part 4a and an annular extension part 4d which extends to the one blade body 2 side from an outer peripheral edge of the disk part 4c with the extending end thereof in contact with the one blade body 2 so as to form a housing space S1 for housing the coil spring 6 between the shaft part 4a and itself. The shaft member 4 is a one-piece machined article.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pivot shaft structure for connecting a pair of blade bodies to each other in a midway portion thereof so as to be rotatable.

  Conventionally, a general scissor has a pair of blade bodies having a blade portion on one end side and a finger ring portion on the other end, and each blade body is pivoted in a through-hole formed in each middle portion thereof. Are inserted so as to be rotatable with respect to each other, and the blade portions of both blade bodies are opened and closed by moving the finger ring portions closer to or away from each other.

  By the way, when both blade bodies are rotated when using the above-described scissors, if one blade body is inclined in the plate thickness direction with respect to the other blade body, the blade portion side of both blade bodies is opened in the plate thickness direction. As a result, there arises a problem that the sharpness is lowered, or the opening / closing operation on the blade part side in both blade bodies is not smooth.

  In order to avoid this, for example, the pivot shaft of Patent Document 1 includes a shaft member including a screw portion and a head portion, and a nut that can be screwed to the screw portion of the shaft member. It has the disc part which has a joint hole, and the cyclic | annular extension part extended to the blade body side from the outer peripheral part of this disc part. Then, by overlapping the middle parts of both blade bodies, screwing the screw part of the shaft member into both through holes, and screwing the nut in a state where a coil spring is sheathed from the tip side of the screw part. In a state where the coil spring is disposed inside the annular extending portion, the disc portion and the surface of the one blade body are brought into contact with each other and the both blade bodies are sandwiched between the heads of the shaft members by the biasing force. At the same time, the extending end of the annular extending portion comes into contact with the surface of the one blade body. As a result, the two blade bodies rotate while being in close contact with each other. Furthermore, even if one blade body is inclined in the plate thickness direction with respect to the other blade body, the surface of one blade body is Since the blade side of both blades does not open in the plate thickness direction in contact with the extended end of the annular extension of the nut, the sharpness is good, and the opening and closing operation on the blade side of both blades is smooth. It has become.

Japanese Unexamined Patent Publication No. 2013-081748 (paragraphs 0025 and 0026, FIG. 3)

  By the way, in the pivotal shaft structure of the scissors as in Patent Document 1, it is necessary to provide a region in which the coil spring is disposed on the surface side of one blade body, and further, to secure the minimum necessary number of screws in the screwing hole of the nut. Therefore, it is necessary to set the thickness of the disc part of the nut to a predetermined value or more. Therefore, the nut protrudes greatly from the surface of one of the blades, which may interfere with the user who uses the scissors.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a pivot structure of the heel that reduces the amount of protrusion from the blade surface and improves the feeling of use by the user. It is in.

  In order to achieve the above object, the present invention is characterized in that the pivot is composed of a pair of shaft members and the shape thereof is devised.

  Specifically, a pair of blade bodies having a blade portion on one end side and a finger ring portion on the other end are inserted into a through hole formed in each middle portion of the pair of blade bodies so as to be pivotably connected to each other. The following measures were taken for the pivot structure of the scissors that enables the blades of the both blades to be opened and closed by the approaching / separating operations of the finger ring portions.

  That is, in the first invention, each of the pivot shafts has a shaft portion and a bowl-shaped head portion continuous to the proximal end of the shaft portion, and the distal ends of the shaft portions are screwed together by a screw structure. A pair of shaft members configured to be connectable are provided, and the shaft portions of the one shaft member are fitted so that the shaft portions face each other in the through-holes of the blade bodies with the intermediate portions overlapped. In the inserted and screwed state, one end is in contact with the one head and the other end is in contact with the one blade, and the two blades are connected to the other head by the biasing force. A coil spring sandwiched between the two and the one head portion accommodating the coil spring between a disc portion extending radially outward from a base end of the one shaft portion and the one shaft portion. Extending from the outer peripheral edge of the disk part to the one blade body side so that a space is formed And a extended end of portion out annular extending in contact with one of the blade above, a region of at least the shaft portion and the disk portion at one of the shaft member above, characterized in that it is an integral workpiece.

  According to a second invention, in the first invention, the disc portion and the annular extension portion are separate bodies, and an inner peripheral surface of the annular extension portion has a base end of the annular extension portion. An annular fitting step portion is formed, which extends along the periphery and is engaged with the outer periphery of the disk portion when the two shaft portions are screwed together.

  According to a third aspect, in the first aspect, the one shaft member is an integrally processed product.

  In a fourth invention, in any one of the first to third inventions, the surface of the one blade body extends along the peripheral edge of the opening in the through hole of the one blade body, and the annular extension An annular stepped portion that contacts the extended end of the portion is formed, and the coil spring is configured such that one end contacts the one head and the other end contacts the bottom surface of the annular stepped portion. .

  According to a fifth aspect, in the fourth aspect, the bottom surface of the annular stepped portion has a stepped shape in which the inner peripheral side is recessed rather than the outer peripheral side, and the annular extended portion extends to the outer peripheral side. One end is in contact with the other end, and the other end of the coil spring is in contact with the inner peripheral side.

  In the first invention, the region of the shaft portion and the disk portion in one shaft member is integrally processed, and the screw portion is formed on the shaft portion, while the disk portion has no screw portion, There is no restriction that the thickness of the disk portion is set to a predetermined value or more in order to secure the minimum number of screws. Therefore, since the thickness of the disk portion at the head of one shaft member can be reduced, the amount of the portion protruding from the surface of the blade body in the pivot structure is reduced, and this portion obstructs the user who uses the scissors. It does not become a habit of good usability.

  In the second invention, in the shaft member, the annular extending portion having a cylindrical shape and the substantially T-shaped portion in a side view including the shaft portion and the disc portion are separately processed. It is not necessary to perform complicated processing such as forming an annular groove portion for accommodating the coil spring in the portion later, and the number of processing steps can be reduced.

  In the third aspect of the invention, since the rigidity of the entire one shaft member is increased, a pivot structure in which deformation and breakage are unlikely to occur can be achieved.

  In the fourth invention, the amount of the portion protruding from the surface of the blade body in the pivot structure is further reduced by the dimension from the surface of one blade body to the bottom surface of the annular stepped portion. Can be increased.

  In the fifth invention, the coil spring comes to be positioned inside one blade body as compared with the structure of the fourth invention by the dimension from the outer peripheral side bottom surface to the inner peripheral side bottom surface of the annular stepped portion. The amount of the portion protruding from the surface of the blade can be further reduced as compared with the structure of the fourth invention, and the usability of the user who uses the scissors can be further enhanced.

It is a top view of the bag to which the pivot structure in Embodiment 1 of this invention was applied. It is sectional drawing in the II-II line of FIG. FIG. 3 is a view corresponding to FIG. 2 according to Embodiment 2 of the present invention. It is FIG. 2 equivalent view which concerns on Embodiment 3 of this invention. FIG. 6 is a view corresponding to FIG. 2 according to Embodiment 4 of the present invention. FIG. 6 is a view corresponding to FIG. 5 according to Embodiment 5 of the present invention.

Hereinafter, the pivot structure of the bag according to the embodiment of the present invention will be described with reference to the drawings.
Embodiment 1 of the Invention
FIG. 1 shows a barber 1 for hairdressing to which a pivot structure 10 according to Embodiment 1 of the present invention is applied. The scissors 1 include a pair of blade bodies 2 having a blade portion 2a on one end side and a finger ring portion 2b on the other end, and a midway portion of the both blade bodies 2 is provided in each middle portion of the both blade bodies 2. Through holes 2c corresponding to each other in the overlapped state are formed.

  The through hole 2c of one blade body 2 has a square cross section in a direction perpendicular to the hole center line.

  On the other hand, the through hole 2c of the other blade body 2 has a circular cross section in a direction orthogonal to the hole center line, and an inner peripheral surface thereof is provided on the one blade body 2 side, and the through hole 2c The first inner peripheral surface 2d that extends straight along the hole center line and the one inner peripheral surface on the opposite side of the one blade body 2 are provided continuously, and gradually expands as the distance from the one blade body 2 increases. A tapered second inner peripheral surface 2e having a diameter and the second inner peripheral surface 2e are continuously provided on the opposite side of one blade body 2, and extend straight along the hole center line of the through hole 2c. It is comprised with the 3rd internal peripheral surface 2f.

  A pivot 3 for connecting the blades 2 to each other in a rotatable manner is fitted in the through holes 2c. The pivot 3 is connected to the two blades 2 by the approaching / separating operation of the two finger ring portions 2b. The opening / closing operation on the blade portion 2a side is enabled.

  As shown in FIG. 2, the pivot 3 includes a pair of shaft members 4 and 5.

  The shaft member 4 is an integrally processed product formed by cutting out from a steel material, and includes a shaft portion 4a having a columnar shape and a bowl-shaped head portion 4b continuous with a base end of the shaft portion 4a.

  The head portion 4b includes a disc portion 4c extending radially outward from the base end of the shaft portion 4a, and a cylindrical annular shape extending from the outer peripheral edge portion of the disc portion 4c in the same direction as the shaft portion 4a. 4d, and the extended end of the annular extended portion 4d is positioned so as not to protrude beyond the tip of the shaft portion 4a.

  The outer peripheral surface of the substantially half of the tip end side of the shaft portion 4a has a square shape corresponding to the cross section of the through hole 2c in the one blade body 2, and the shaft portion 4a A threaded recess 4e that opens at the tip of the portion 4a is formed.

  In a portion surrounded by the shaft portion 4a, the disc portion 4c, and the annular extension portion 4d, an annular accommodation space S1 that opens to the extension end side of the shaft portion 4a is formed. The coil spring 6 in the state of being sheathed on the shaft portion 4a can be accommodated. When the coil spring 6 is housed in the housing space S1 in a natural length state, a part of the coil spring 6 protrudes from the opening portion of the housing space S1.

  In addition, a tapered surface 4f that gradually decreases in diameter toward the extension end side of the annular extension portion 4d is formed on the storage space S1 side of the disc portion 4c.

  The shaft member 5 is a so-called screw member, and includes a shaft portion 5a having a thread threaded on an outer peripheral surface thereof, and a hook-shaped head portion 5b continuous with a base end of the shaft portion 5a. 5a can be screwed into the screwing recess 4e of the shaft member 4.

  That is, the front end sides of the shaft members 4 and 5 are configured to be screwed together by a screw structure.

  The opposite surface of the head portion 5b to the shaft portion 5a is a curved surface that protrudes away from the shaft portion 5a.

  The outer diameter of the head 5b is designed to correspond to the inner diameter of the third inner peripheral surface 2f of the through hole 2c in the other blade body 2.

  And in the state which coat | covered the coil spring 6 in the axial part 4a of the shaft member 4, and accommodated the said coil spring 6 in accommodation space S1, the through-hole of one blade body 2 of each blade body 2 which piled up the middle part The shaft portion 4a of the shaft member 4 is inserted into 2c, while the shaft portion 5a of the shaft member 5 is inserted into the through hole 2c of the other blade body 2 so as to face the shaft portion 4a, and the screwing is performed. The shaft members 4 and 5 are screwed together by being screwed into the recess 4e.

  The extending end of the annular extending portion 4d of the shaft member 4 is in contact with the surface of the one blade body 2 in a state where the shaft members 4 and 5 are screwed together.

  Further, the head portion 5b of the shaft member 5 is located inside the third inner peripheral surface 2f and the outer peripheral edge portion thereof is the second inner peripheral surface in a state where the shaft members 4 and 5 are screwed together. It comes to contact 2e.

  And the said coil spring 6 is accommodated in the said accommodation space S1 in the compressed state in the state which the said shaft members 4 and 5 screwed together, and one end is set to the taper surface 4f of the disc part 4c. While being in contact, the other end is in contact with the surface of one of the blade bodies 2, and the both blade bodies 2 are sandwiched between the head 5 b of the shaft member 5 by the biasing force.

  As described above, according to the first embodiment of the present invention, the regions of the shaft portion 4a and the disc portion 4c in the shaft member 4 are integrally processed, and the screw portion 4e is formed in the shaft portion 4a. Since there is no threaded portion in the portion 4c, there is no restriction that the thickness of the disc portion 4c is set to a predetermined value or more in order to secure the minimum number of screws. Therefore, since the plate | board thickness of the disc part 4c in the head 4b of the shaft member 4 can be made thin, the quantity of the part which protrudes from the surface of the blade body 2 in the pivot structure 10 reduces, and the said part uses the scissors 1. It does not get in the way of the user, and it becomes a good feeling 1 for use.

Further, since the shaft member 4 is an integrally processed product, the rigidity of the shaft member 4 as a whole is increased, and the pivot structure 10 that is unlikely to be deformed or damaged can be obtained.
<< Embodiment 2 of the Invention >>
FIG. 3 shows the pivot structure 10 of the heel 1 according to Embodiment 2 of the present invention. The pivot structure 10 of the second embodiment is different from the first embodiment in the structure around the through-hole 2c in the other blade body 2, and the other parts are the same. Therefore, different parts will be described in detail.

  On the inner peripheral surface of the through hole 2c in the other blade body 2 of the second embodiment, a step-like annular fitting portion 2g extending along the opening peripheral edge on the opposite side of the one blade body 2 is formed. A bearing B1 is fitted in the joint portion 2g.

  The shaft portion 4a of the shaft member 4 in a state of being inserted from the through hole 2c of one blade body 2 and positioned in the through hole 2c of the other blade body 2 is fitted inside the inner race of the bearing B1. It is supposed to be.

  The surface on the opposite side of the shaft portion 5a of the head portion 5b of the shaft member 5 of the second embodiment is a flat surface, and the head portion 5b is in a state where the shaft portion 5a is screwed into the screwing recess 4e. In contact with the inner race of the bearing B1.

As described above, according to the second embodiment of the present invention, the same effect as in the first embodiment can be obtained, and the rotation operation of the other blade body 2 with respect to one blade body 2 can be further smoothed by the bearing B1. Can do.
<< Embodiment 3 of the Invention >>
FIG. 4 shows the pivot structure 10 of the heel 1 according to Embodiment 3 of the present invention. The pivot structure 10 of the third embodiment is different from the first embodiment in the structure of the head 4b of the shaft member 4, and the other parts are the same. Therefore, different parts will be described in detail.

  In the head portion 4b of the shaft member 4 in the third embodiment, the disc portion 4c and the annular extending portion 4d are separated. That is, the region of the shaft part 4a and the disk part 4c in the shaft member 4 is an integrally processed product, and extends along the inner peripheral surface of the annular extension part 4d along the base end periphery of the annular extension part 4d. When the shaft portion 5a is screwed into the screwing recess 4e, an annular fitting step portion 4g is formed in which the outer peripheral edge portion of the disc portion 4c is fitted.

As described above, according to the third embodiment of the present invention, in the shaft member 4, the annular extending portion 4d having a cylindrical shape and the portion having a substantially T shape in a side view including the shaft portion 4a and the disc portion 4c are formed. Since the processing is performed separately, it is not necessary to perform complicated processing such as forming an annular storage space S1 for storing the coil spring 6 in the head 4b of the shaft member 4 later, and the number of processing steps can be reduced.
<< Embodiment 4 of the Invention >>
FIG. 5 shows the pivot structure 10 of the heel 1 in Embodiment 4 of the present invention. Since the pivot structure 10 of the fourth embodiment is different from the first embodiment in the partial structure of one blade body 2 and the other parts are the same, the different parts will be described in detail.

  On the surface of one blade body 2 in the fourth embodiment, an annular step portion 2h extending along the opening periphery of the through hole 2c of the one blade body 2 is formed, and the annular extension in the head portion 4b of the shaft member 4 is formed. The extending end of the portion 4d is in contact with the bottom surface of the annular step portion 2h.

  The coil spring 6 has one end in contact with the head 4b of the shaft member 4 and the other end in contact with the bottom surface of the annular step portion 2h.

As described above, according to the fourth embodiment of the present invention, the amount of the portion protruding from the surface of the blade body 2 in the pivot structure 10 by the dimension from the surface of one blade body 2 to the bottom surface of the annular step portion 2h is the same as that of the first embodiment. Since it reduces further compared with a structure, the usability of the user who uses the bag 1 can further be improved.
<< Embodiment 5 of the Invention >>
FIG. 6 shows the pivot structure 10 of the heel 1 in Embodiment 5 of the present invention. Since the pivot structure 10 of the fifth embodiment is different from the fourth embodiment in the partial structure of one blade body 2 and is otherwise the same, the different parts will be described in detail.

  In the fifth embodiment, the bottom surface of the annular step portion 2h formed on one blade body 2 has a stepped shape in which the inner peripheral side bottom surface 2j is recessed rather than the outer peripheral side bottom surface 2i. While the extension end of the extension part 4d contacts, the other end of the coil spring 6 contacts the inner peripheral bottom surface 2j.

  As described above, according to the fifth embodiment of the present invention, the coil spring 6 is placed inside one blade body 2 by the dimension from the outer peripheral side bottom surface 2i to the inner peripheral side bottom surface 2j of the annular stepped portion 2h as compared with the structure of the fourth embodiment. Since it comes to be located, the amount of the portion protruding from the surface of the blade body 2 in the pivot structure 10 can be further reduced as compared with the structure of the fourth embodiment, and the usability of the user who uses the scissors 1 is further enhanced. Can do.

  In the first to fifth embodiments of the present invention, the shaft member 4 of the shaft members 4 and 5 is provided with the disc portion 4c and the annular extending portion 4d so that the coil spring 6 is accommodated in the accommodating space S1. On the other hand, the head 5b of the shaft member 5 is provided with a structure such as a disk portion 4c and an annular extension 4d, and an accommodation space S1 for accommodating the coil spring 6 is formed. You may make it the structure which sticks both the blades 2 between the heads 4b of the member 4. FIG.

  Moreover, in Embodiment 1-5 of this invention, although the cross-sectional shape of one blade body 2 is square, other polygonal shapes may be sufficient.

  Furthermore, although the pivot structure of each said Embodiment 1-5 is used for the pivot structure 10 of the barb 1 for hairdressing, it can be applied also to the pivot structure of the barb for a dressmaking other than this, for example.

DESCRIPTION OF SYMBOLS 1 ２ 2 Blade body 2a Blade part 2b Finger ring part 2c Through-hole 2h Annular step part 3 Pivot 4 Axle member 4a Axle part 4b Head part 4c Disk part 4d Annular extension part 4f Tapered surface 4g Fitting step part 4h Annular step part 4i outer peripheral side bottom surface 4j inner peripheral side bottom surface 5 shaft member 5a shaft portion 5b head portion 6 coil spring 10 pivot structure S1 accommodation space

Claims (5)

A pair of blade bodies having a blade portion at one end and a finger ring portion at the other end are inserted into a through-hole formed in each middle portion of the pair of blade bodies so as to be pivotably connected to each other, thereby the both finger ring portions. A pivot structure of the scissors that enables opening and closing operations on the blade side of the two blades by the approaching / separating operation of
Each of the pivots has a pair of shafts each having a shaft part and a bowl-shaped head part that is continuous with the base end of the shaft part, and the distal ends of the shaft parts are configured to be screwed together by a screw structure. A shaft member,
In the shaft portion of the one shaft member, the shaft portions are fitted and inserted so as to face each other in the respective through holes of the blade bodies in which the middle portions are superimposed, A coil spring that has one end in contact with the one head and the other end in contact with the one blade and sandwiching the two blades with the other head by the biasing force is sheathed,
The one head has an accommodating space for accommodating the coil spring between the disc portion extending radially outward from the base end of the one shaft portion and the one shaft portion. An annular extension part extending from the outer peripheral edge of the disc part toward the one blade body and having an extension end in contact with the one blade body;
A pivotal shaft structure of a scissors, wherein at least the region of the shaft portion and the disc portion of the one shaft member is an integrally processed product. In the pivot structure of the scissors according to claim 1,
The disc part and the annular extension part are separate bodies,
The inner peripheral surface of the annular extension portion extends along the base end periphery of the annular extension portion, and the outer peripheral edge portion of the disc portion is fitted when the shaft portions are screwed together. A pivotal shaft structure of a bag, characterized in that an annular fitting step portion is formed. In the pivot structure of the scissors according to claim 1,
The pivot shaft structure of the scissors, wherein the one shaft member is an integrally processed product. In the pivot structure of the scissors according to claim 3,
On the surface of the one blade body, an annular stepped portion is formed which extends along the peripheral edge of the opening in the through hole of the one blade body and is in contact with the extending end of the annular extending portion,
The coil spring is configured so that one end is in contact with the one head portion and the other end is in contact with the bottom surface of the annular step portion. In the pivot structure of the scissors according to claim 4,
The bottom surface of the annular stepped portion has a stepped shape in which the inner peripheral side is recessed rather than the outer peripheral side, the extension end of the annular extending portion contacts the outer peripheral side, and the coil spring on the inner peripheral side. A pivot structure of the heel, characterized in that the other end is in contact.

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