JP5468044B2 - Trimming shears - Google Patents

Description

  The present invention relates to a cutting shear.

  Conventionally, a pair of handle portions and a pair of blade portions provided at the tips of the handle portions have been provided as cutting shears for cutting branches and leaves of planted trees, garden trees, etc. Tied cutting shears are widely used (see Patent Document 1).

Registered Utility Model No. 3074834

  However, in order to cope with the cutting of thick and hard tree branches, it has been necessary to form the length of the handle portion to be somewhat long. The more you try to cut thick and hard branches with a small force, the longer the length of the handle part, and the larger the external dimensions and weight, the more inconvenient to carry. was there. Further, there is a problem that the work efficiency is easily reduced due to the increase in weight, and the work efficiency tends to be reduced.

  Therefore, an object of the present invention is to provide a trimming scissor that is compact and can be easily cut even with a thick and hard branch with a small force.

The trimming scissors according to the present invention have a pair of plate-like blade portions that are pivotably pivoted by a first pivot portion and intersect in an X shape, and a short plate-like connecting portion at the tip is a second pivot. A pair of pivotally pivoted at the joint and pivotally pivoted at the third pivotal portion on the base end side of the plate-like blade portion from the second pivoted portion to the proximal end side A pair of the plate-like blade portions, and a pair of the plate-like blade portions, in the vicinity of the proximal end side of the first pivotal portion, a sliding contact piece that prevents the distal blade portions from separating from each other at the time of cutting. It is what you have .

Also, the pair of the plate-piece-shaped blade portion, At a closed state, a cutout recess that contacts close to those at the distal end of the connecting portion in which are formed adjacent to the sliding contact protrusion.

  Further, as viewed from the axial direction of the first pivoting portion, the pair of plate-like blade portions has a front first blade portion and a rear second blade portion, and the front first blade The rear second connecting part is close to the back surface of the base end side attaching part of the part, and the front first connecting part is close to the front face of the base end side attaching part of the rear second blade part. Further, the thickness dimension of the first and second blade part proximal end side mounting parts and the thickness dimension of the first and second connecting parts are set substantially the same, and the plate The total thickness dimension of the piece-like blade part and the connecting part is configured to be twice the thickness dimension of each of the proximal end side attachment parts of the first and second blade parts.

  According to the trimming scissors of the present invention, it is not necessary to lengthen the handle, and the tree branch can be easily cut with a small force. In particular, a large cutting force can be exerted at the start of cutting with the blade portion wide open, and even a thick and hard branch can be cut lightly and smoothly with a small force. Moreover, since the thickness dimension is not different from the conventional one, it is difficult to interfere with the branches of the tree. Moreover, it is compact and easy to carry.

It is the front view which showed the closed state of one Embodiment of the cutting shears concerning this invention. It is the front view which showed the intermediate state of the cutting shears of this invention. It is the front view which showed the fully open state of the cutting shears of this invention. It is a principal part enlarged front view of a cutting shear. It is a principal part enlarged front view of a cutting shear. It is XX sectional drawing of FIG. It is YY sectional drawing of FIG. It is a simplified diagram for explaining the operation. It is a simplified diagram for explaining the operation. It is the left view which showed the principal part of the trimming shears.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 3 show an embodiment of a cutting shear according to the present invention. FIG. 1 shows a closed state, FIG. 2 shows an intermediate state, and FIG. 3 shows a fully opened state. ing.
The trimming scissors of the present invention have a pair of plate-like blade portions 3, 3 pivotably pivoted by a first pivoting portion 11 and intersecting in an X shape, and a short plate-like connecting portion 2 at the tip. , 2 are pivotably pivoted at the second pivotal portion 12, and the base end side mounting portions 3 </ b> B, 3 </ b> B of the plate-like blade portions 3, 3 are pivoted to the third pivot from the second pivotal portion 12 to the proximal end side. A pair of handle portions 4 and 4 pivotably connected by the connecting portions 13 and 13 are provided.
The plate-like blade portion 3 is made of a metal plate material, and includes a blade portion 3A having a cutting edge 30 (distal side) on the distal end side from the first pivoting portion 11, and closer to the proximal end side than the first pivoting portion 11. A mounting portion 3B having a through-hole 33 in the vicinity of the lower end edge (base end side) is provided. The plate-like blade portions 3 and 3 are integrally pivoted at the first pivot portion 11 by bolts, nuts and the like. The plate-like blade portion 3 is bent in the vicinity of the first pivoting portion 11 and is formed in a substantially square shape. A stopper 14 is fixed to the tip side blade portion 3A of one plate-like blade portion 3 of the two sheets.

As shown in FIGS. 4 and 5, the pair of plate-like blade portions 3, 3 has sliding contact protrusions 8, 8 that prevent the distal blade portions 3 A, 3 A from separating from each other during cutting. It is provided in the vicinity of the base end side of the connecting portion 11.
The sliding contact piece 8 is disposed in the vicinity of the base end side of the first pivotal portion 11 in the middle of the plate-like blade portion 3 and includes the corner portion of the substantially square plate-like blade portion 3. Is formed. The sliding contact pieces 8, 8 are in sliding contact with each other when the pair of plate-like blade portions 3, 3 are largely open, and are in contact with each other when the pair of plate-like blade portions 3, 3 are about to close. It is formed so as to be in sliding contact with the base end side mounting portion 3 </ b> B of the portion 3.

In addition, the pair of plate-like blade portions 3, 3 are slidable projecting pieces in the closed state shown in FIG. 8 and 8 are formed adjacent to each other.
8A corresponds to the intermediate state of FIG. 2, and FIG. 8B corresponds to the state where the plate-like blade portion 3 is slightly closed as compared to the intermediate state as shown in FIG. ) Corresponds to the closed state of FIG.
The notch recess 9 is formed by cutting out a connecting portion between the sliding contact piece 8 and the base end side attachment portion 3B in a substantially arc shape. When the plate-like blade portions 3 and 3 are closed and the tip portion 2A of the connecting portion 2 gradually approaches the plate-like blade portion 3, the tip portion 2A of the connecting portion 2 escapes into the notch recess 9 in the closed state. Thus, interference with the plate-like blade portion 3 is avoided.

The handle portion 4 has a handle main body portion 4A, and the connecting portion 2 extends from the distal end edge of the handle main body portion 4A. The handle main body 4A is formed in an elongated rod shape, and is covered with a synthetic resin or the like so that the user can easily grip it. ing. The handle portions 4 and 4 are pivotally coupled together by bolts, nuts, and the like at second pivotal portions 12 provided at the distal end portions 2A and 2A of the coupling portions 2 and 2.
The connecting portion 2 is made of a metal plate material and is bent inward in a front view. A through hole 23 is provided in the base end portion 2B of the connecting portion 2 so as to correspond to the through hole 33 provided in the base end side mounting portion 3B of the plate-like blade portion 3, and a third pivot. The plate-like blade portion 3 is pivotally connected to the portions 13 and 13 by bolts, nuts or the like.

As shown in FIGS. 4 and 5, when viewed from the axial direction of the first pivoting portion 11, the pair of plate-like blade portions 3 and 3 includes a front first blade portion 31 and a rear second blade portion. 32. Similarly, the handle parts 4, 4 have a front first connecting part 21 and a rear second connecting part 22. As shown in FIGS. 6 and 7, the rear second connecting portion 22 is close to the back surface of the base end side mounting portion 3 </ b> B of the front first blade portion 31, and the rear second blade portion. The front first connecting portion 21 is configured to be close to the front surface of the base end side mounting portion 3B. Further, the proximal mounting portion 3B of the first and second blade portions 31 and 32, for one sheet of 3B and thickness _{t 3} of the thickness _{t 2} of the first and second connecting portions 21, 22 substantially The total thickness dimension T of the plate-like blade part 3 and the connecting part 2 is set to be the same as the thickness dimension t ₃ of each of the proximal end side attachment parts 3B of the first and second blade parts 31 and 32. It is configured to be doubled.
In the illustrated example, as viewed from the front (in the axial direction of the first pivotal portion 11), the first blade portion 31 on the right side is the front and the second blade portion 32 on the left side is overlapped and assembled. In addition, the left first connecting portion 21 is set to the front to correspond closely to the back surface of the base end side mounting portion 3B of the first blade portion 31, and the right second connecting portion 22 is set to the rear to set the base of the second blade portion 32. It is made to correspond to the front surface of the end side attachment part 3B in proximity. With this configuration, the first and second blade portions 31 and 32 and the first and second connecting portions 21 and 22 are equivalent to the base end side mounting portions 3B and 3B of the first and second blade portions 31 and 32, respectively. It assembled with a thickness (corresponding to 2 times the thickness t _3), a compact, yet, less clearance between the parts, to prevent the biting of the branches and leaves during cutting.

Cutting Komi鋏of the present invention, the plate piece-like cutting portions 3 pivotally connected to (first and second blade portions 31, 32) openably to the first axis L ₁ around the first pivotally connected portion 11 as a fulcrum and, and, and pivotally connected openably the handle portion 4, 4 to the second axis L ₂ around the second pivotally connected portions 12 as a fulcrum. Moreover, it is pivotally connected pivotably to the plate piece-like blade section 3 and the handle portion 4 to the third axis L ₃ around at third pivot connection part 13. As described above, a plurality of fulcrums are formed on the plate-like blade portions 3 and 3 and the handle portions 4 and 4 to constitute a booster mechanism using the lever principle. That is, the trimming scissors of the present invention are configured such that a large cutting force can be obtained with a small force (compared to the conventional scissors scissors) by this boosting mechanism.

The usage method (action) of the above-described cutting shears of the present invention will be described.
In FIG. 1 to FIG. 3, the operation when the handle portions 4 and 4 are closed from the fully opened state (see FIG. 3) will be described.
As shown in FIG. 3, the handle portions 4, 4 are swung in the opening direction, and are deployed until the plate-like blade portions 3, 3 come into contact with the stopper 14 and stop. In this fully open state, when the angle of the handle portions 4 forms when opening up excursion maximum full open swing angle theta _2, the plate-piece-shaped blade portions 3 are expanded with a maximum unfolded angle beta.

Then, across the Hikarizai _{Z 1} between the plate piece-like blade section 3,3, the handle main body 4A of the handle portions 4 and applying a pressing force _F 0, _{F 0} inwardly 4A, handle The parts 4 and 4 swing in the closing direction, and the third pivot parts 13 and 13 approach each other. As the third pivotal portions 13 and 13 approach, the plate-like blade portions 3 and 3 swing in the closing direction with the first pivotal portion 11 as a fulcrum, and the plate-like blade portions 3 and 3 the cutting material _{Z 1} is cut by sandwiching the edge 30, 30. At this time, the plate-like blade portions 3 and 3 are subjected to cutting forces F _A and F _A larger than the pressing forces F ₀ and F ₀ applied to the handle portions 4 and 4 by the lever principle. That is, upon cleavage of Hikarizai Z _1, even if that requires a large cutting force, the pressing force F ₀ applied to the shank 4 and 4 requires a small force, a plate piece-like blade section 3,3 Can be cut by exerting a large cutting force F _A.

As shown in FIG. 2, when the handle parts 4 and 4 are further closed, the third pivot parts 13 and 13 further approach and the plate-like blade parts 3 and 3 swing in the closing direction. This intermediate state Te at, when the angle of the handle portions 4 makes with the intermediate oscillation angle theta _1, a plate piece-like blade section 3, 3 are assumed to be deployed with a intermediate deployment angle alpha. At this time, the handle main body 4A of the handle portions 4, the pressing force F ₁ is applied to 4A, the plate piece-like blade section 3,3, Te This principle than the pressing force F ₁ exerted on the shank 4 Also, a large cutting force F _B acts. Thus, the plate piece-like blade section 3, 3, with a great cutting force F _B than the pressing force F ₁ which is applied to the handle portions 4, to cut the Hikarizai Z _2.

Then, as shown in FIG. 1, when the plate-like blade portions 3 and 3 are closed until they contact the stopper 14, the angle formed by the blade edges 30 and 30 is almost 0 °, and the closed state is obtained. In this closed state, an angle formed by the handle parts 4 and 4 is defined as a minimum swing angle θ ₀ .

In the trimming scissors according to the present invention, from the fully open state to the intermediate state, the handle parts 4 and 4 change from the fully open swing angle θ ₂ to the intermediate swing angle θ _{1 and} swing at an angle of (θ ₂ −θ ₁ ). To do. As the handle portions 4 and 4 swing, the plate-like blade portions 3 and 3 close from the maximum deployment angle β to the intermediate deployment angle α and swing at an angle of (β−α). Since the trimming scissors of the present invention are provided with a boosting mechanism, the swing angle (θ ₂ −θ ₁ ) of the handle portions 4 and 4 is the swing angle (β-α) of the plate-like blade portions 3 and 3. From the law of conservation of momentum, it can be seen that it exerts a large cutting force with a small force.

In addition, the angle θ of the handle portions 4 and 4 in the fully open state with respect to the ratio α / θ ₁ between the angle θ ₁ of the handle portions 4 and 4 in the intermediate state and the angle α of the plate-like blade portions 3 and 3. ₂ the ratio beta / theta ₂ between the angle beta of the plate piece-like blade parts 3 is configured to be smaller. That is, as the handle part 4 and 4 are long wide open, Te the boosting action by the principle is exhibited larger and when felling example thick rigid object cutting material Z _1, cut started very gently smooth Yes. In other words, and when cut hard branches thick more than half, when cutting thin the cutting material Z ₂ is not less it requires a large cutting force to cut the thick stiff branches which requires the greatest cutting force At this time, the plate-like blade portions 3 and 3 (pattern portions 4 and 4) can be greatly opened to efficiently exhibit a large cutting force.

As shown in FIG. 10, separation forces F _X and F _X act on the plate-like blade portions 3 and 3 in a direction that separates the distal blade portions 3A and 3A from each other at the time of cutting. The plate-like blade portions 3 and 3 receive the separation forces F _X and F _X , and the sliding contact projections 8 and 8 come into pressure contact with each other, so that the holding forces F _Y and F against the separation forces F _X and F _X are obtained. _Y is exhibited. In FIG. 9, the plate-like blade portions 3, 3 receive the separation forces F _X , F _X in the arc-shaped area E near the tips of the sliding contact pieces 8, 8, and the holding force F as the repulsive force _{Y 1} and F _Y are exhibited. Since the arc-shaped area E is close to the first pivoting portion 11 serving as a fulcrum and is disposed within the range of the small radius R, the sliding contact piece 8 is provided with the first pivoting portion 11 by the lever principle. The holding forces F _Y and F _{Y that} are larger than the separation forces F _X and F _X acting at a position far away from the center act. In this way, the sliding contact protrusions 8 and 8 reliably prevent the tip side blade portions 3A and 3A of the plate-like blade portions 3 and 3 from separating from each other even when a thick and hard branch is cut.

  As shown in FIG. 8, the distal end portion 2 </ b> A of the connecting portion 2 gradually approaches the plate-like blade portion 3 as it approaches the closed state (see FIG. 8C), and approaches or slidably contacts the sliding contact protrusion 8. While entering the notch recess 9. In the closed state, the plate-like blade portion 3 accommodates the distal end portion 2A of the connecting portion 2 in a notch recess 9 adjacent to the sliding contact projection piece 8, and the sliding contact projection piece 8 has a sufficient size to be secured to the distal end. Interference between the plate-like blade portion 3 and the tip portion 2A of the connecting portion 2 is avoided without impairing the function of preventing the side blade portions 3A and 3A from separating.

  In the present invention, the design can be changed. For example, the handle portion 4 may be formed as a separate part in which the handle main body portion 4A and the connecting portion 2 are detachable. In this case, the plate-like blade portion 3 is formed. It is also possible to attach the handle body part 4A to the connecting part 2 by attaching the connecting part 2 to the connecting part 2 after the connecting part 2 is pivoted.

  As described above, the cutting shear according to the present invention includes the pair of plate-like blade portions 3 and 3 that are pivotably pivoted by the first pivoting portion 11 and intersect in an X shape, and the short plate at the tip. The piece-like connecting portions 2, 2 are pivotably pivoted at the second pivotal portion 12, and are attached to the base end side mounting portion 3 </ b> B of the plate-like blade portions 3, 3 on the proximal end side from the second pivotal portion 12. , 3B is pivotally pivoted at the third pivotal portions 13 and 13 so that the handle 4 and 4 can be pivoted. A large cutting force can be exhibited at the start of cutting when the blade portions 3 and 3 are opened widely, and even a thick and hard branch can be cut lightly and smoothly with a small force. Moreover, since it does not easily interfere with the branches of the tree and does not get in the way, it can be cut quickly. In addition, since the external dimensions do not increase, it is compact and easy to carry.

  Further, the pair of plate-like blade portions 3 and 3 are provided in the vicinity of the proximal end side of the first pivotal portion 11 with sliding contact pieces 8 and 8 that prevent the distal blade portions 3A and 3A from separating from each other during cutting. Therefore, even when a thick and hard branch is cut, the cutting edge portions 3A and 3A of the plate-like blade portions 3 and 3 are not separated and can be cut smoothly and reliably.

  Further, when the pair of plate-like blade portions 3 and 3 are in a closed state, the notched recesses 9 and 9 that are close to or abut against the distal end portions 2A and 2A of the connecting portions 2 and 2 are formed as sliding contact pieces 8 and 8, respectively. Since it forms adjacently, interference with the plate-shaped blade part 3 and the front-end | tip part 2A of the connection part 2 can be avoided.

Further, when viewed from the axial direction of the first pivotal portion 11, the pair of plate-like blade portions 3, 3 has a first blade portion 31 at the front and a second blade portion 32 at the rear, The rear second connecting portion 22 is close to the back surface of the base end side mounting portion 3B of the first blade portion 31, and the front side of the base end side mounting portion 3B of the rear second blade portion 32 is the front first. 1 connecting portion 21 is configured to close, further, the base end side mounting portion 3B of the first and second blade portions 31 and 32, first and second connecting and thickness _{t 3} of the one sheet of 3B set the thickness t ₂ parts 21, 22 in substantially the same total thickness T of the coupling portion 2 and the plate piece-like blade section 3, the proximal attachment of the first and second blade portions 31 and 32 since it is configured to be twice the respective thickness t ₃ parts 3B, compact in the thickness direction in spite and a booster mechanism, moreover, less clearance between the parts, during the cutting Branches and leaves Biting can be prevented.

2 connecting portion 2A tip portion 3 plate-like blade portion 3A tip side blade portion 3B base end side attachment portion 4 handle portion 8 sliding contact piece 9 notch recess portion 11 first pivot portion 12 second pivot portion 13 third pivot forming unit 21 first connecting portion 22 a second connecting portion 31 first blade section 32 second blade section t ₂ thickness t ₃ thickness T total thickness

Claims (3)

A pair of plate-like blade portions (3) and (3) pivotably pivoted by the first pivot portion (11) and intersecting in an X shape, and a short plate-like connecting portion (2) at the tip (2) is pivotably pivoted at the second pivotal portion (12) and is proximal to the second pivotal portion (12) at the proximal end of the plate-like blade portions (3) (3). side mounting portion and (3B) (3B) a third pivotally connected section (13) a pair of handle portions that pivotally connected pivotably at (13) (4) (4), comprising, a pair of the plate The piece-like blade portions (3) and (3) are provided with sliding contact projection pieces (8) and (8) for preventing the tip blade portions (3A) and (3A) from separating from each other during cutting. 11) A trimming scissor characterized by having it in the vicinity of the base end side . The pair of plate-like blade portions (3) and (3) are notched recesses (9) that are close to or abut on the tip portions (2A) and (2A) of the connecting portions (2) and (2) in the closed state. The trimming scissors according to claim 1, wherein (9) is formed adjacent to the sliding contact piece (8) (8) . The pair of plate-like blade portions (3), (3), as viewed from the axial direction of the first pivot portion (11), includes a front first blade portion (31) and a rear second blade portion ( 32), the rear second connecting portion (22) is close to the back surface of the base end side mounting portion (3B) of the front first blade portion (31), and the rear second The front first connecting portion (21) is configured to be close to the front surface of the base end side mounting portion (3B) of the blade portion (32),
Further, the thickness dimension (t ₃ ) of one of the base end side attachment portions (3B) (3B) of the first and second blade portions (31) and (32 ) and the first and second connecting portions ( 21) The thickness dimension (t ₂ ) of (22) is set to be substantially the same, and the total thickness dimension (T) of the plate-like blade part (3) and the connection part (2) is the first The trimming scissors according to claim 1 or 2 , configured to be twice the thickness dimension (t ₃ ) of each of the proximal end side attachment portions (3B) of the second blade portions (31) (32) .

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