CN208353977U - Shearing tool - Google Patents
Shearing tool Download PDFInfo
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- CN208353977U CN208353977U CN201820653369.6U CN201820653369U CN208353977U CN 208353977 U CN208353977 U CN 208353977U CN 201820653369 U CN201820653369 U CN 201820653369U CN 208353977 U CN208353977 U CN 208353977U
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- blade
- shear
- line
- sword line
- sword
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Abstract
The utility model relates to a kind of shearing tools, which is characterized in that the equation of the sword line of left shear-blade is set as y=f (xC), the Curvature varying i.e. tangent slope for pinpointing C is set as KC=f(1)(xC), the equation of the sword line of right shear-blade is set as y=g (xD), the Curvature varying i.e. tangent slope for pinpointing D is set as KD=g(1)(xD), then the slope K of C is pinpointed on left shear-blade sword lineC=f(1)(xC) slope K with point D on the sword line of right shear-bladeD=g(1)(xD) equation group should be met: xC 2+f(xC)2=xD 2+g(xD)2arctan(KD)-arctan(KC)-θ=β。
Description
Technical field
The present invention relates to a kind of shearing tools, and in particular, to the manual operation of a kind of picking apple or similar fruit
Shearing tool.
Background technique
In the picking of the fruit such as such as apple, pears, peach, citrus, it usually needs fruit is picked with small stem, it is former
Because being if without small stem, fruit will cracking be infected by bacterial and rot.This pole be unfavorable for fruit later period storage with
Sale.Therefore, for the picking of such fruit, the small stem of fruit need to be cut using cutter, and cannot be by the way of pullling.
Meanwhile in order to prevent durings storage, transport etc., to prevent from being reserved in, the small stem on fruit is too long and stabs or weighs wounded and is other
Fruit, it usually needs the small stem length degree that control is reserved on fruit.
And in existing fruit picking, orchard workers generally use scissors or secateurs carrys out fruit-picking, but with scissors or
When secateurs carrys out fruit-picking, it usually needs hold fruit with a hand, it is complete that another hand cuts small stem using scissors or secateurs
At picking.Itself main reason is that, the use of scissors or secateurs needs while occupying thumb, index finger, middle finger and the third finger, nothing
The small stem of fruit is cut off while method realization is hold by one hand fruit.
On the other hand, because the handle of common scissors or secateurs is located at the opposite side of the blade centered on hinge, structure
Size is larger, opposite to seem heavy, cannot well adapt in fruit picking, compact and flexible requirement.
In addition, design feature of the handle of scissors or secateurs not according to human hands, setting can be such that finger hooks naturally
Grip part, in use, scissors or secateurs are not only easy to fall, but also will cause finger and handle when use for a long time
Ache contact site.
Summary of the invention
Problems to be solved by the invention is to provide a kind of shearing tool, specifically, provides one kind and adapts to human hands structure
Feature is conveniently connected to finger and hand, realizes the flexible, small and exquisite, laborsaving of the small stem cutting of fruit while being hold by one hand fruit
Shearing tool, on the other hand, the curve shape of shear blade is improved, makes it in shear history by the root of shear blade
Part until front end, intersecting angle formed by two-edged line is substantially constant with rupturing operation with off-position, to change
It is apt to the stress condition of the shear blade in shear history.
In order to solve the above-mentioned technical problems, the present invention provides a kind of shearing tools, comprising: left shear-blade, right shearing
Blade and the pin shaft for combining the left shear-blade rotatably freely in end with right shear-blade, in the left shear knife
The cutter head portion of piece and right shear-blade is provided with the finger hook portion that the finger for user is hooked in scheduled finger areas,
The sword line of the left shear-blade and right shear-blade is curve-like,
It is characterized in that, in the state of opening the shearing tool,
The staggered cross-point of the sword line of the sword line of left shear-blade and right shear-blade is set as A, by left shear-blade
Sword line be set as β (rad) in the angle that the tangent line of cross-point A intersects in the tangent line of cross-point A and the sword line of right shear-blade,
It will be described in the tie line and the right shear-blade of the fixed point C of the left shear-blade and rotation center O
The angle that the tie line of the fixed point D and rotation center O intersects is set as θ (rad),
The equation of the sword line of left shear-blade is set as y=f (xC), the Curvature varying i.e. tangent slope for pinpointing C is set as KC
=f(1)( xC), the equation of the sword line of right shear-blade is set as y=g (xD), the Curvature varying i.e. tangent slope for pinpointing D is set as KD=
g(1)(xD),
The slope K of C is then pinpointed on left shear-blade sword lineC =f(1)( xC) slope with point D on the sword line of right shear-blade
KD=g(1)(xD) equation group should be met:
xC 2+f(xc)2= xD 2+g(xD)2,
arctan(KD)-arctan (KC)-θ=β,
Wherein β (rad) is fixed angle.
Preferably, the equation of the sword line of the left shear-blade meets water droplet curve: y=x0.5(1-x).
Shearing tool provided by the present invention by the way that finger hook portion is set to cutter head side, and combines human hands knot
Structure feature improves the curve shape of shear blade, makes in shear history by the portion until the root to front end of shear blade
Point, intersecting angle formed by two-edged line is substantially constant with rupturing operation with off-position, so as to improve in shear history
The stress condition of shear blade keeps the gripping of cutter more convenient, operates more flexible laborsaving.
Detailed description of the invention
Fig. 1 is the perspective view of shearing tool of the present invention.
Fig. 2 is the top view of shearing tool of the present invention.
Fig. 3 is the perspective view of the left shear-blade of shearing tool of the present invention.
Fig. 4 is the top view of the left shear-blade of shearing tool of the present invention.
Fig. 5 is the perspective view of the right shear-blade of shearing tool of the present invention.
Fig. 6 is the top view of the right shear-blade of shearing tool of the present invention.
Fig. 7 is the top view under shearing tool open state of the present invention.
Fig. 8 is shearing tool sword line analysis diagram of the present invention.
Fig. 9 is shearing tool sword line derivation algorithm flow chart of the present invention.
Specific embodiment
In order to keep the above objects, features and advantages of the present invention more obvious and easy to understand, with reference to the accompanying drawing and specifically
The present invention is described in further detail for embodiment.
As shown in Figures 1 to 6, the shearing tool of present embodiment includes left shear-blade 11, right shear-blade 12 and makes
The left shear-blade 11 can be rotated the pin shaft 13 combined freely in end with right shear-blade 12.The pin shaft 13 is located at a left side
The end of shear-blade 11 and right shear-blade 12, the common scissors knot being located in the middle part of blade different from common hinge centres
Structure.
As depicted in figs. 1 and 2, the cutter head portion of the left shear-blade 11 is provided with the finger hook portion 21 in ring shape,
It is hooked in the middle part of finger for the thumb of user.And the root of the finger hook portion 21 in left shear-blade 11 is provided with one
For keeping off the interior convex arcuation lug 24 of shield user's thumb root, prevent from causing thumb root sour when using for a long time
Bitterly.The finger hook portion 22 of the right shear-blade 12 is hooked in finger in shape by packet ear for the index finger and middle finger of user
Portion or front, or finger middle part or front are hooked in for the middle finger and the third finger of user.
Now by taking user cuts off object with the right hand gripping shearing tool as an example, user's right hand thumb passes through a left side
The finger hook portion 21 in ring shape of 11 cutter head portion of shear-blade setting, right hand index finger and middle finger are each passed through right shear-blade
12 be in the ear hole 25,26 of the finger hook portion of shape by packet ear, and the shearing tool is placed between the tiger's jaw of user's right hand.Pass through
User's right hand thumb does opening and closing movement relative to index finger and middle finger to drive the left shear-blade 11 and right shear-blade
12 relatively rotate, to realize the function of shearing object.Because of the finger in ring shape of left 11 cutter head portion of shear-blade setting
Hook portion 21 is set on user's thumb, while right shear-blade 12 is set in the finger hook portion 22 of shape by packet ear and makes
The index finger and middle finger of user is hooked in the middle part of finger or front, so during use, shearing tool can be with relatively naturally
State is fixed between the finger, prevents falling and slipping in use.Likewise, user can also according to itself
Use habit right shear-blade 12 is set in the middle part of middle finger and nameless finger in the finger hook portion 22 of shape by packet ear or
Front.
For enable left shear-blade 11 finger hook portion 21 and right shear-blade 12 finger hook portion 22 preferably with
The finger of user combines, and the finger hook portion 21 of left shear-blade 11 and the finger hook portion 22 of right shear-blade 12 are set as
Semi-closed structure.User can adjust the curvature of the finger hook portion 21 of left shear-blade 11 according to own situation, thus
To adjust the size of the ear hole 27 of left shear-blade 11 and the ear hole 25,26 of right shear-blade 12.In the present embodiment, left shearing
The cross sectional shape of the ear hole 27 of the finger hook portion 21 of blade 11 is set as a kind of elliptical shape, long axis 30mm, and short axle is
25mm.The cross sectional shape of the ear hole 25,26 of right shear-blade 12 is set as a kind of round, a diameter of 20mm.Ear hole 25 with
The center of ear hole 26 is away from for 25mm.
The left shear-blade 11 and right shear-blade 12 are metal plates to be made of stainless steel as material, entirely through one
Body punching press and bending technique forming.The thickness of the metal plate is arbitrary, and in the present embodiment, is set as 1.8mm.
In addition, in the present embodiment, which can be centered on pin shaft 13 relative to 12 turns of the right shear-blade
It is dynamic, it is unlikely to make to be cut object slippage, the sword line 31 of the left shear-blade 11 in order to make the shearing tool when shearing object
Sword line 32 with right shear-blade 12 is unsymmetric structure, and the sword line 31 of the left shear-blade 11 is a convex outer curve, described
The sword line 32 of right shear-blade 12 is an inner concave curve.In the course of rotation intersecting angle formed by two-edged line 31,32 with
Off-position is substantially constant with rupturing operation, alternatively, the intersecting angle becomes with off-position far from the pin shaft 13
Greatly.
As previously mentioned, 31 curved shape of sword line of left shear-blade 11 is a convex outer curve, but not will be before by sword line
The curvature being set to be constant until base portion is held, but makes the Curvature varying of sword line 31 at compared to front end side, base is gradually reduced
The radius of curvature of portion side, that is to say, that gradually increase the curvature of base portion side.The back of left shear-blade 11 is formed by shape and is
To approach the smooth curve or straight line of straight line, connection by left shear-blade 11 front end side to base portion shape.In addition, left shearing
Blade 11, which is bent to, gradually becomes smaller base portion to front end side.
Equally, 32 curved shape of sword line of right shear-blade 12 is an inner concave curve, is acted on using the hook of inner concave curve,
The curvature that prevents from being sheared the slippage of object in shearing, but will not be set to be constant until by the front end to base portion of sword line,
Its Curvature varying is 31 curved shape of sword line according to left shear-blade 11 and changes, and makes sword line 31 and the right side of left shear-blade 11
The sword line 32 of shear-blade 12 in the course of rotation intersecting angle formed by two-edged line as off-position is with rupturing operation
It is substantially constant, alternatively, the intersecting angle becomes larger with off-position far from the pin shaft 13.
As shown in fig. 7, in the present embodiment, using rotation center O as origin, with a fixed point B and rotation on left shear-blade 11
The line for turning center O establishes x-axis, establishes y-axis with the vertical direction of x-axis, and define and clockwise turn to positive direction.If a left side is cut
The sword line 31 of cutting edge 11 meets equation y=f (xC), the sword line 32 of right shear-blade 12 meets equation y=g (xD).In rotating
The distance of fixed point C of heart O to left shear-blade 11 is set as R(mm), the distance of the fixed point D of rotation center O to right shear-blade 12
It is set as S(mm), the angle between line OC and OD is θ (rad), i.e., when line OC rotates clockwise θ radian, C point and D point weight
It closes, if the angle between the tangent line of the fixed point D of the tangent line and right shear-blade 12 of the fixed point C of left shear-blade 11 is β (rad),
Then C point should meet with D point equation in coordinates:
xC 2+f(xC)2= xD 2+g(xD)2。
To which x can be set when not rotatingDAbout xCFunction be xD=Φ (xC) and xD> Φ (xC), left shear-blade 11
It is K that Curvature varying, that is, tangent slope of C is pinpointed on sword line 31c=f(1)( xC), wherein f(1)( xC) indicate f (x) in xCOne
Order derivative.Curvature varying, that is, tangent slope of point D is K on the sword line 32 of right shear-blade 12D=g(1)(xD), wherein g(1)(xD)
It is g (x) in xDFirst derivative, then on the sword line 31 of left shear-blade 11 pinpoint C slope Kc=f(1)(xc) and right shear-blade
The slope K of point D on 12 sword line 32D=g(1)(xD) equation should be met:
arctan(KD)-arctan (KC)-θ=β
Wherein β (rad) is fixed angle or an angle changing.
In this way, when C point is rotated to D point, it can be by the sword line 31 of left shear-blade 11 and right shear-blade
12 sword line 32 the stagger angle β (rad) of staggered position maintain a fixed angle or an angle changing.
That is, regardless of the opening angle between left shear-blade 11 and right shear-blade 12 changes, left shearing
Angle of the crossing β formed by sword line 32 of the sword line 31 of blade 11 with right shear-blade 12 can be tieed up with off-position with rupturing operation
It holds in a fixed angle or an angle changing.
In the present embodiment, the equation of the sword line 31 of left shear-blade 11 meets water droplet curve:
y=x0.5(1-x)
Then the sword line 32 of right shear-blade 12 meets equation:
Arctan(g(1)(xl))-arctan(f(1)(x))-θ=β
Wherein xl=Φ (x) is EQUATION x2+f(x)2= xl 2+g(xl)2Solution, and meet xl< Φ (x),
Rotate angle, θ=arctan (g (xl)/xl)-arctan (f (x)/x).
Since above-mentioned equation is a nonlinear differential equation, it is difficult to provide general analytic solutions.Here, providing a pass
In the numerical algorithm of the sword line 32 of right shear-blade 12.As shown in Fig. 8, simplify sword line 31 and 32, sword line 31 is given song
Line, sword line 32 are to meet above-mentioned equation curve to be asked.In fig. 8, OCi=ODi, i.e. O is circular arc CiDiThe center of circle, and arc CiDi's
Central angle is θi。OCi+1=ODi+1, i.e. O is circular arc Ci+1Di+1The center of circle, and arc Ci+1Di+1Central angle be θi+1。 CiCoordinate be
(xCi,yCi), Ci+1Coordinate be (xCi+1,yCi+1), DiCoordinate be (xDi,yDi), Di+1Coordinate be (xDi+1,yDi+1), line
Section DiD+ i+1It is DiTangent section, and DiD+ i+1Length be equal to DiDi+1。
When sword line 31 rotates counterclockwise such that C around O pointiAnd DiPoint is overlapped.The angle of required rotation is θi, CiCut
Line and DiTangent line angle be β.As step delta x=xCi+1- xCiIt is sufficiently small, it can be line segment DiD+ i+1With DiDi+1It is considered as coincidence
Line segment, and with arc DiDi+1It is overlapped.It thus can be by Di+1It was considered as point DiTangent line and circular arc Ci+1Di+1Intersection point, then Di+1Seat
Mark (xDi+1,yDi+1) equation (x can be passed through2 Ci+1+ y2 Ci+1)0.5=(x2 Di+1+ y2 Di+1)0.5With equation yDi+1=KDi*( xDi+1-
xDi)+ yDiSimultaneous is found out.Wherein KDiFor DiD+ i+1In DiThe slope of point, xCi+1 = xCi+ Δ x and meet xDi+1> xDi.To guarantee
Ci+1With Di+1When coincidence, the corresponding tangent line angle of two o'clock is β, then crosses point Di+1Tangent slope KDi+1Meet equation arctan
(KDi+1)= arctan(KCi+1)+β+θi+1, wherein K Ci+1For Ci+1The slope of point.By all DiConnecting curve obtained can be close
It is seemingly sword line 32 to be asked.As shown in figure 9, its derivation algorithm is as follows:
Step 1: setting starting point C0(xC0,yC0), terminal (xe,ye), step delta x, D0(xD0,yD0) and C0To be overlapped
Point;
Step 2: calculating D0The slope K of pointD0Meet equation arctan (KD0)= arctan(KC0)+ β;
Step 3: xCi+1 = xCi+Δx, yCi+1=f(xCi+1);
Step 4: judging xCi+1< xeContinue the 5th step if set up, otherwise terminates；
Step 5: seeking Di+1(xDi+1,yDi+1) meet (x2 Ci+1+ y2 Ci+1)0.5=(x2 Di+1+ y2 Di+1)0.5With yDi+1=KDi*(
xDi+1- xDi)+ yDi；
Step 6: calculating K Ci+1And θi+1；
Step 7: calculating KDi+1Meet equation arctan (KDi+1)= arctan(KCi+1)+β+θi+1；
Step 8: returning to third step.
In order to limit the big of opening and closing close angle degree when left shear-blade 11, right shear-blade 12 are rotated centered on pin shaft 13
It is small, be respectively arranged with mutual cooperation in the tail portion of left shear-blade 11, right shear-blade 12, for two shear-blades open with
The compressor body 41 and spacing breach 42 that closure angle is limited.
In addition, being provided with the spring for opening two shear-blades automatically between left shear-blade 11, right shear-blade 12
43, it can enumerate such as flowering structure: by adding compressed spring between the shear-blade of left and right, by between the shear-blade of left and right
Torsional spring is added centered on pin shaft.
Embodiments of the present invention are described in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned realities
Mode is applied, within the knowledge of one of ordinary skill in the art, many variations can also be made to it.Therefore,
Protection scope of the present invention is not limited merely to examples detailed above, and all technical solutions belonged under thinking of the present invention belong to the present invention
Protection scope.
Claims (2)
1. a kind of shearing tool, comprising: left shear-blade (11), right shear-blade (12) and make the left shear-blade (11) with
Right shear-blade (12) can be rotated the pin shaft (13) combined freely in end, in the left shear-blade (11) and right shear knife
The cutter head portion of piece (12) is provided with the finger hook portion (21,22) that the finger for user is hooked in scheduled finger areas,
The sword line (31,32) of the left shear-blade (11) and right shear-blade (12) is curve-like,
It is characterized in that, in the state of opening the shearing tool,
The staggered cross-point of the sword line (31) of left shear-blade (11) and the sword line (32) of right shear-blade (12) institute is set as A,
By the sword line (31) of left shear-blade (11) in the tangent line of cross-point A and the sword line (32) of right shear-blade (12) in cross-point A
Tangent line intersect angle be set as β (rad),
By the fixed point C of left shear-blade (11) and the tie line of rotation center O and fixed point D and the institute of the right shear-blade (12)
The angle for stating the tie line intersection of rotation center O is set as θ (rad),
The equation of the sword line (31) of left shear-blade (11) is set as y=f (xC), the Curvature varying i.e. tangent slope for pinpointing C is set
For KC=f(1)(xC), the equation of the sword line (32) of right shear-blade (12) is set as y=g (xD), pinpoint the i.e. tangent line of Curvature varying of D
Slope is set as KD=g(1)(xD),
The slope K of C is then pinpointed on left shear-blade (11) sword line (31)c=f(1)(xC) with the sword line (32) of right shear-blade (12)
The slope K of upper DD=g(1)(xD) equation group should be met:
xC 2+f(xC)2= xD 2+g(xD)2,
arctan(KD)-arctan (KC)-θ=β,
Wherein β (rad) is fixed angle.
2. shearing tool according to claim 1, which is characterized in that the side of the sword line (31) of the left shear-blade (11)
Journey meets water droplet curve: y=x0.5(1-x).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820653369.6U CN208353977U (en) | 2018-05-04 | 2018-05-04 | Shearing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820653369.6U CN208353977U (en) | 2018-05-04 | 2018-05-04 | Shearing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208353977U true CN208353977U (en) | 2019-01-11 |
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ID=64933487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820653369.6U Expired - Fee Related CN208353977U (en) | 2018-05-04 | 2018-05-04 | Shearing tool |
Country Status (1)
| Country | Link |
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| CN (1) | CN208353977U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307800A (en) * | 2018-05-04 | 2018-07-24 | 湖南师范大学 | Shearing tool |
-
2018
- 2018-05-04 CN CN201820653369.6U patent/CN208353977U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307800A (en) * | 2018-05-04 | 2018-07-24 | 湖南师范大学 | Shearing tool |
| CN108307800B (en) * | 2018-05-04 | 2023-10-10 | 湖南师范大学 | Shearing tool |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190111 Termination date: 20190504 |
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| CF01 | Termination of patent right due to non-payment of annual fee |