JPS6226051Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to scissors having a new contact point mechanism and particularly suitable for hairdressing.

(Prior Art) A contact point is formed at the pivot joint of a pair of blades constituting scissors, and the function of the contact point generates a shearing force between the cutting edges of the blades from the base of the blade to the tip of the blade. However, when the contact point is integrally formed on the opposing surface of the blade pivot joint, it is difficult to adjust the shearing force, and the strength varies, and when the contact point wears out with use and the shearing force decreases, it is necessary to replace the scissors with a new one. Must.

Therefore, in order to make it easier to adjust the shearing force and to make it possible to replace only the contact point function part, a contact point mechanism has been installed between the blade pivot parts. No. 75196/1984 discloses that one or two leaf springs are interposed between the pivot parts of the blade and their tips are locked in small holes in the blade.

(Problem to be solved by the invention) However, such a leaf spring type contact mechanism,
When the scissors are open, the leaf spring is largely exposed to the outside, which gives it a poor appearance.Furthermore, since the tip of the exposed part is only slightly inserted diagonally into the small hole to lock it, it causes unstable locking. There is a problem that the leaf spring easily comes off due to the stoppage.

Therefore, the purpose of the present invention is to improve the appearance by housing the contact point mechanism inside without exposing it to the outside, and to create a pair of scissors in which the shearing force increases rapidly from the middle as the scissors are closed. It is on offer.

(Means for Solving the Problems) In order to solve the above problems and achieve the purpose, the present invention provides a through-hole 2 , 34 are formed in the flat-bottom circular recesses 25, 35, and small holes 2 are formed in the flat bottom surfaces 26, 36 of the circular recesses 25, 35.
7, 37, and have protrusions 47, 57 that engage with the small holes 27, 37 on flat lower surfaces 46, 56, and have through holes 44, 54 in the center, forming a pair of circular media made of a rigid body. The members 4 and 5 are inserted into the circular recesses 25 and 3.
5, and the upper surface of the circular intermediary members 4, 5 is extended from the thinnest parts 42, 52 on the blade cutting edges 21, 31 side to the thickest parts 43, 53 on the blade handle 22, 32 side from the middle. The inclined curved surfaces 41 and 51 are formed so that the curvature changes rapidly and the wall thickness increases rapidly.
1 and 51 are brought into contact with each other to form the circular intermediary members 4 and 5.
is inserted between the flat bottom surfaces 26, 36 of the circular recesses 25, 35, and the blade bodies 2, 3 are inserted into the through holes 24, 3.
Pivotally coupled at 4, 44, 54,
The sum H of the thicknesses of the thickest parts 43 and 53 of the circular intermediate members 4 and 5 is defined as the flat bottom surface 2 of the circular recesses 25 and 35.
It is characterized by being set larger than the sum h of the depths of 6 and 36.

(Function) The scissors 1 is configured in this way, and in particular, the upper surface has a curvature from the thinnest parts 42, 52 on the blade cutting blades 21, 31 side to the thickest parts 43, 53 on the blade handle 22, 32 side. Circular intermediary members 4, 5 made of rigid bodies formed on inclined curved surfaces 41, 51 whose wall thicknesses rapidly change and rapidly increase are formed on opposing surfaces at the pivot joints of the blades 2, 3 and penetrated. Since the circular intermediary members 4 and 5 are interposed between the flat-bottom circular recesses 25 and 35 having holes 24 and 34 at their centers, as the scissors 1 is closed, the circular intermediate members 4 and 5 rotate together with the respective blade bodies 2 and 3, Thickest wall part 43,
53 move toward each other via the circular intermediate member 6, and due to its lifting action, the handles 2 of the blade bodies 2, 3
The 2nd and 32nd sides receive the expansion pressing force.

As a result, the shearing force of the cutting blades 21 and 31 gradually increases from the blade base to the cutting edge, and especially from the point where the curvature suddenly changes and the wall thickness rapidly increases in the middle, where the blades come into contact with each other, the blade body 2,3 pattern 22,3
Since the expansion pressing force between the two sides increases rapidly, the shearing force of the cutting blades 21 and 31 increases rapidly, and the shearing force is highest at the cutting edge where the thickest parts 43 and 53 are in phase. .

Moreover, the circular intermediary members 4, 5 are housed in the circular recesses 25, 35 on the surfaces of the blade bodies 2, 3 facing the pivot parts, and the projections 4 are inserted into the small holes 27, 37 of the flat bottom surfaces 26, 36.
7 and 57, the scissors 1 has a good appearance without exposing the contact mechanism to the outside, and the contact mechanism can be reliably stored and held.

(Example) Examples will be described below based on the accompanying drawings.

Figures 1 and 2 show an external view and an exploded view of the scissors.The scissors 1 are for hairdressing, and consist of a pair of blade bodies 2 and 3, which are a static blade and a moving blade, which are pivotally connected. Blade body 2,
3 includes cutting blades 21, 31, handles 22, 32, and ring 2.
3, 33 are formed, and flat-bottomed circular recesses 25, 35 having through holes 24, 34 at the center are formed on opposing surfaces of the pivoting parts of the blade bodies 2, 3.
5, 35 flat bottom surfaces 26, 36 blade handles 22, 32
Small holes 27, 37 are formed on the sides, and the touch point mechanism is accommodated in these circular recesses 25, 35.

The contact point mechanism consists of a pair of circular intermediary members 4, 5 made of a rigid body of hard resin or metal, and the upper surfaces of the circular intermediary members 4, 5 are formed into inclined curved surfaces 41, 51 as shown in FIG. It has through holes 44, 54 in the center, and protrusions 47, 57 are provided on flat lower surfaces 46, 56 perpendicular to the outer circumferential surfaces 45, 55. The inclined curved surfaces 41, 51 have curvatures from the middle so that the wall thickness of the circular intermediary members 4, 5 increases rapidly from the middle from the thickness d of the thinnest parts 42, 52 to the thickness D of the thickest parts 43, 53. It changes rapidly,
The protrusions 47 and 57 on the lower surfaces 46 and 56 are the thickest parts 4
It is provided on the 3rd and 53rd sides.

The contact point mechanism is housed in the circular recesses 25, 35 as shown in FIG.

That is, the projections 47, 57 are engaged with the small holes 27, 37 to accommodate the circular mediating members 4, 5 in the circular recesses 25, 35, respectively, and the inclined curved surfaces 41,
51 are brought into contact with each other, and the pivot pin 6 is inserted into the through holes 34 and 5.
4, 44, and 24, and the nut member 7 is screwed onto the threaded portion 61 at the tip thereof to pivotally connect the blade bodies 2 and 3.

In this way, the inclined curved surfaces 41 and 51 are brought into contact with each other so that the thinnest parts 42 and 52 are on the side of the cutting edges 21 and 31 of the blade body,
In particular, the circular intermediate members 4, 5 are interposed between the circular recesses 25, 35 with the thickest parts 43, 53 facing the blade handles 22, 32.

Note that a spring plate 8 having a long hole 81 for passing the pin 6 is interposed between the nut member 7 and the blade body 2, and a downward protrusion 82 provided at one end of the spring plate 8 is located on the side of the handle 22 of the blade body 2. It is engaged with a small hole 28 on the surface, and an upwardly directed projection 83 provided at the other end is resiliently engaged with a plurality of small holes (not shown) on the lower surface of the nut member 7.

In the above, the sum h of the depths of the flat bottom surfaces 26 and 36 of the circular recesses 25 and 35 shown by the two-dot chain line in FIG.
On the other hand, the thickest parts 43, 5 of the circular intermediary members 4, 5
Set the sum H (=2D) of the wall thicknesses D of 3 to a large value.

When the scissors 1 are wide open, the thickest part 4
3 and 53 are also largely separated from each other in phase, and the thickness of the interposed part in this state is approximately equal to or slightly smaller than the sum h of the depths of the flat bottom surfaces 26 and 36.

Since the contact mechanism is configured in this way, as the scissors 1 are closed, they are housed in the circular recesses 25 and 35,
The projections 4 are inserted into the small holes 27, 37 of the flat bottom surfaces 26, 36.
The circular intermediary members 4, 5 engaged at 7, 57 rotate together with the respective blade bodies 2, 3, and the thickest parts 43,
53 move toward each other, the lift action causes the blades 2 and 3 to move closer together as shown by the arrow in FIG.
The handle 22, 32 side receives the expansion pressing force.

As a result, the shearing force of the cutting blades 21 and 31 gradually increases from the blade base to the cutting edge, and especially from the point where the curvature suddenly changes and the wall thickness rapidly increases in the middle, where the blades come into contact with each other, the blade body 2,3 pattern 22,3
Since the expansion pressing force between the two sides increases rapidly, the shearing force of the cutting blades 21 and 31 increases rapidly, and the shearing force is highest at the cutting edge where the thickest parts 43 and 53 are in phase. .

Moreover, the circular intermediary members 4, 5 are housed in the circular recesses 25, 35 on the surfaces of the blade bodies 2, 3 facing the pivot parts, and the projections 4 are inserted into the small holes 27, 37 of the flat bottom surfaces 26, 36.
7 and 57, the scissors 1 has a good appearance without exposing the contact mechanism to the outside, and the contact mechanism can be reliably stored and held.

The curvature, wall thickness, etc. of the inclined curved surface of the circular intermediary member can be set in various ways depending on the hair type and user's preference, so it can be replaced to adjust the shearing force to the appropriate level, and it can also be used to prevent wear and tear due to use. In contrast, it is sufficient to simply replace the circular intermediary member without replacing the scissors.

Note that the pivot structure is not limited to the embodiment, and any arbitrary structure may be adopted.

(Effects of the invention) As described above, according to the scissors of the present invention, in particular, the circular recess on the surface facing the pivot point of the blade body is made of a rigid material, and the upper surface is connected from the thinnest part on the cutting edge side to the blade handle. The contact point mechanism is constructed by housing a circular intermediary member with an inclined curved surface whose curvature changes suddenly and the thickness rapidly increases from the middle toward the thickest part of the side, so as the scissors are closed, The shearing force can be rapidly increased, the appearance of the scissors can be improved without exposing the touch mechanism to the outside, and the touch mechanism can be reliably stored and retained.

[Brief explanation of the drawing]

Figures 1 and 2 are an external perspective view and an exploded perspective view of the scissors, Figure 3 is an enlarged perspective view of the circular intermediary member, and Figure 4 is a vertical cross-section taken along the - line in Figure 1 to clearly show the action. It is a diagram. In addition, in the drawing, 1 is scissors, 2, 3 are blade bodies, 21, 3
1 is a cutting blade, 22, 32 is a handle, 24, 34 are through holes, 25, 35 are circular recesses, 26, 36 are flat bottom surfaces, 27, 37 are small holes, 4, 5 are circular intermediate members,
41 and 51 are inclined curved surfaces, 42 and 52 are the thinnest parts,
43, 53 are the thickest parts, 44, 54 are through holes, 4
6 and 57 are lower surfaces, 47 and 57 are projections, 6 is a pivot pin, and 7 is a nut member.

Claims (1)

[Claim for Utility Model Registration] A flat-bottomed circular recess with a through-hole in the center is formed on opposing surfaces of the pivot joints of the pair of blades, and a small hole is formed in the flat bottom of the circular recess; A pair of circular intermediary members made of a rigid body having a flat lower surface with a protrusion that engages with the small hole and a through hole in the center is housed in the circular recess, and the upper surface of the circular intermediary member is cut with a blade. An inclined curved surface is formed in which the curvature suddenly changes from the thinnest part on the blade side to the thickest part on the handle side of the blade, and the thickness rapidly increases, and the inclined curved surfaces are brought into contact with each other to form the circular media. A member is interposed between the flat bottom surfaces of the circular recess to pivotally connect the blade body in the through hole, and the sum of the thicknesses of the thickest parts of the circular intermediate member is calculated as the sum of the thicknesses of the flat bottom surfaces of the circular recess. Scissors characterized by the fact that the depth is set to be greater than the sum of the depths.