JP3364448B2 - Pruning shears - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to scissors having a cutting force amplifying function.

[0002]

2. Description of the Related Art Pruning shears require a large cutting force to cut branches of various thicknesses and hardnesses. Further, since the branches to be cut are often separated from the hands, the branch cutting scissors need to obtain a cutting force at a position apart from the hands.

Conventionally, in the branch cutting scissors, as a means for obtaining a cutting force at a position away from the hand, a string-shaped body is connected to a cutting blade member provided with a cutting blade, and a pulling force is applied to the string-shaped body. Therefore, a method of pivoting the cutting edge with respect to the branch receiving portion is often adopted. Further, as the cutting scissors having a cutting force amplifying function, for example, there is one disclosed in Japanese Patent Publication No. 62-461129.

This branch cutting scissors with a cutting force amplifying function is shown in FIG.
As shown in FIG. 5, a receiving member 52 having a hook-shaped branch receiving portion 51 is attached to the tip of a handle 54 through a bracket 53, and the receiving member 52 has a cutting blade 55.
6 and the lever 57 are pivotally attached, and the cutting blade member 56 and the lever 57 are
Are linked by a link 58. Further, a movable pulley 59 and a fixed pulley 60 are attached to the tip of the lever 57 and the bracket 53, respectively, and a string 62 whose one end is tied to a suspension fitting 61 of the movable pulley 59 is a fixed pulley 60 and a movable pulley 59.
Is wrapped around. Therefore, by applying a traction force to the other end of the string 62, the moving pulley 59 is fixed.
Moving to the side, the lever 57 is rotated clockwise, and the cutting blade 55 of the cutting blade member 56 joined by the link 58 is pivoted toward the hook-shaped branch receiving portion 51. Although not shown, the lever 57 is a coil spring attached to the rotary shaft and is biased counterclockwise.

The above-mentioned branch cutting scissors have a moving pulley attached to a lever to amplify the cutting force by using the pulley mechanism and the principle of leverage. The cutting force amplifying function is obtained by directly attaching the moving pulley to the cutting blade member. There are also branch cutting scissors.

[0006]

In the above-mentioned conventional branch cutting scissors with a cutting force amplifying function, since the pulley mechanism is externally attached to the tip end of the handle provided with the cutting blade, these pulley mechanisms are There is a problem that it is difficult to cut the dense branches when hitting the surrounding branches. In addition, the string-shaped body of the pulley mechanism may be caught on a branch or the like around the pulley, and the string-shaped body may not be smoothly pulled.

Therefore, an object of the present invention is to provide a branch cutting scissors which has a compact tip end of a handle provided with a cutting blade and which can easily cut a branch even at a densely packed branch.

[0008]

In order to solve the above problems, the present invention provides a receiving member provided on the tip side of a handle and having a hook-shaped branch receiving portion, the branch receiving portion being engaged with the receiving member. A cutting blade member having a separating cutting blade is pivotally attached, and this cutting blade member is biased by a spring in a direction in which the cutting blade separates from the branch receiving portion, and directly or indirectly to this cutting blade member. In the branch cutting scissors for connecting the first string-shaped body and applying a traction force to the first string-shaped body, the cutting blade is pivoted toward the branch receiving portion, and the handle is formed into a tubular shape. Then, a movable pulley supporting member having a movable pulley is accommodated in the handle so as to be slidable in the longitudinal direction, and the first string-like body connected to the cutting blade member is guided into the handle to make the movable pulley. Insert the fixed pulley support member, which is connected to the support member and has the fixed pulley arranged on the base end side of the handle, to The second string-shaped body is fixed so as to face the supporting member, and one end of the second string-like body is coupled to the moving pulley supporting member or the fixed pulley supporting member, and the winding is alternately wound around the moving pulley and the fixed pulley, and the other end is the handle. Take it out of this second
By pulling the cord-shaped body, the cutting blade is pivoted toward the branch receiving portion.

That is, the handle is formed in a tubular shape and is connected to the cutting blade member by the first string-like body, and the moving pulley supporting member having the moving pulley is slidably accommodated in the handle and fixed. By inserting a fixed pulley supporting member with pulleys into the handle and fixing it, a pulley mechanism that amplifies the cutting force is incorporated into the handle, and the tip of the handle with cutting blade is made compact. .

A plurality of at least one of the moving pulley and the fixed pulley are arranged on the respective supporting members along the longitudinal direction of the handle, and one end is connected to the moving pulley supporting member or the fixed pulley supporting member. A second string-like body in a pulley mechanism is formed by winding a string-shaped body around the moving pulley and the fixed pulley arranged in the plural or singular order, in order from the pulleys arranged near the supporting member side of the opponent. It is possible to increase the cutting force amplification factor by increasing the number of windings, and it is possible to take out the wound second string-shaped body to the outside without interfering with it.

In the above case, when the second string-like body is connected to the moving pulley supporting member side, the number of moving pulleys and the number of fixed pulleys are the same, and both of them are plural. on the other hand,
When the second string-like body is connected to the fixed pulley supporting member, the number of the fixed pulleys is one less than that of the moving pulleys, and the number of the fixed pulleys is singular only when the number of the moving pulleys is two.

Either one or both of the plurality of moving pulleys and the fixed pulleys, which are arranged closer to the opposing supporting member side, are formed to have a smaller diameter, or the second string-like body is formed. The guide surfaces on the outer circumference of each pulley to be guided are axially shifted between the pulleys in order, and a groove is formed around each of the guide surfaces so that a second string-like member can be wound around the guide surface. It is possible to prevent the second string-shaped bodies from interfering with each other and smoothly pull the second string-shaped bodies.

The fixed pulley support member inserted into the base end side of the handle is provided with a boss portion projecting from the base end side of the handle, and an extension handle is inserted into the boss portion to add a boss to cut a high branch. Can also be used.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show a first embodiment. As shown in FIG. 1 and FIG. 2, this branch cutting scissors has a support 2 which is inserted into the tip of a tubular handle 1.
A receiving member 4 having a hook-shaped branch receiving portion 3 is swingably attached to the support tool 2 with a screw 5, and a cutting blade member 7 having a cutting blade 6 is pivotally attached to the receiving member 4. There is.

The cutting blade member 7 is provided with large and small arms 8 and 9, and a string 10 is connected to the tip of the large arm 8. By applying a traction force to the cord 10, the cutting blade member 7 is pivoted in a direction toward the branch 11 in which the cutting blade 6 is received by the branch receiving portion 3, as indicated by a chain double-dashed line in FIG. It Further, the tip end of the small arm 9 has a coil spring 1
2 is connected to the base portion of the receiving member 4 and the cutting blade 6 is connected to the branch receiving portion 3
It is urged to return from.

The support tool 2 is provided with a cord passing hole 13 and a pair of roller guides 14, and the cord 10 is guided into the handle 1 from between the pair of roller guides 14 through the cord passing hole 13. , Is connected to a movable pulley supporting member 15 slidably accommodated in the handle 1. The fixed pulley supporting member 1 is provided at the base end of the handle 1 so as to face the moving pulley supporting member 15.
6 is inserted and fixed. The fixed pulley supporting member 16 is provided with a boss portion 17 that projects outward from the handle 1, and an extension handle 18 can be added to the boss portion 17.

As shown in FIGS. 3 (a) and 3 (b), the handle 1 is formed in a flat tubular shape, and the movable pulley supporting member 15 is parallel so as to substantially match the inner peripheral cross section of the handle 1. Side plate part 19
Are integrally connected by two upper and lower pillar portions 20, 21 and three movable pulleys 22a, 22b, 22 are provided between the parallel side plate portions 19.
c are arranged along the longitudinal direction of the handle 1 and are rotatably attached to the shaft. A diameter difference is provided between the moving sheaves 22a, 22b, 22c, and those arranged closer to the fixed sheave support member 16 side have smaller diameters. The string 10 is joined to the upper column 20.

The fixed pulley supporting member 16 has a collar portion 23 that comes into contact with the base end of the handle 1, a parallel side plate portion 24 that is inserted into the handle 1, and the boss portion 17 that projects outward from the handle 1. Between the parallel side plates 24, two fixed pulleys 25
A and 25b are arranged along the longitudinal direction of the handle 1 and are rotatably attached to the shaft. A diameter difference is provided between the fixed pulleys 25a and 25b, and the fixed pulley 25a arranged near the moving pulley support member 15 side is formed to have a smaller diameter.

A pillar 26 is provided on the tip side of the side plate portion 24, and one end of a string 27 wound around the pulley mechanism is connected to the pillar 2.
It is connected to 6. The string 27 includes movable pulleys 22a, 22b,
22c and the fixed pulleys 25a and 25b are alternately wound from ones arranged close to each other, and the other end of the string 27 is wound around the outermost moving pulley 22c and then provided on the fixed pulley support member 16. It is taken out to the outside through the string passing hole 28. The string 27 wrapped around the pulley mechanism is
Due to the diameter difference provided between the pulleys, they do not interfere with each other.

When a pulling force F is applied to the other end of the string 27 taken out to the outside, the movable pulley supporting member 15 is pulled toward the fixed pulley supporting member 16 side, and the arm of the movable pulley supporting member 15 and the cutting blade member 7 is pulled. The traction force F is transmitted to the string 10 connecting the 8 and the cutting blade 6 is pivoted to cut the branch 11 received by the branch receiving portion 3. At this time, the pulling force F applied to the string 27 is amplified 6 times by the pulley mechanism in which the string 27 is wound around six times, and is transmitted to the string 10. The moment arm ratio of the blade 6 is about 2
It is amplified twice. Therefore, the cutting force transmitted to the cutting blade 6 is amplified to approximately 12 times the traction force F applied to the string 27.

FIGS. 4A and 4B show the second embodiment. This branch cutting scissors has the same basic structure as that of the first embodiment, and is different only in the form of the pulley mechanism. Between the parallel side plate portions 19 of the movable pulley supporting member 15, three movable pulleys 29a, 29b, 29c having the same diameter are arranged along the longitudinal direction of the handle 1. Each moving pulley 29a, 29b, 29c is provided with a guide surface in which a groove 30 around which the cord 27 is wound is formed, the axial position of which is sequentially shifted.

Two fixed pulleys 31a and 31b having the same diameter are arranged along the longitudinal direction of the handle 1 between the parallel side plate portions 24 of the fixed pulley supporting member 16. Each of these fixed pulleys 31a and 31b is also provided with a guide surface in which a groove 32 around which the string 27 is wound is formed, with its axial position displaced. In this embodiment, each movable pulley 2
Although 9a, 29b, 29c and the fixed pulleys 31a, 31b have the same diameter, a diameter difference may be provided between the respective pulleys as in the first embodiment.

In each of the above-mentioned embodiments, the hand-held cord is manually pulled, but it can also be applied to electric branch cutting scissors for winding the cord at hand by a motor. In this case, The motor can be made small in capacity and compact.

Further, in each of the above-mentioned embodiments, the cord-like body for pivoting the cutting blade is directly connected to the cutting blade member.
As disclosed in Japanese Patent No. 46129, it is also possible to connect via a lever or the like having a cutting force amplification function. The shape of the branch receiving member and the cutting blade member may be any shape as long as the cutting blade and the branch receiving portion are engaged and separated by the pivotal movement of the cutting blade member, and the branch receiving portion is provided with the receiving blade. You can also

Furthermore, the number of moving pulleys and fixed pulleys of the pulley mechanism can be set to any number within the range where the space in the handle is allowed, and one end of the string-like body wound around the pulley mechanism. May be connected to the movable pulley side.

[0026]

As described above, in this branch cutting scissors, the handle is formed in a tubular shape, and the movable pulley supporting member having the movable pulley arranged in the handle is connected to the cutting blade member by the string-shaped body. A handle with a cutting edge is installed because the pulley mechanism that amplifies the cutting force is incorporated into the handle by slidingly storing it and inserting and fixing the fixed pulley support member with the fixed pulley in it. The tip of the can be made into a compact form, and the branch can be easily cut even at a site where the branches are densely packed.

Further, at least one of the moving pulley and the fixed pulley is arranged on each supporting member along the longitudinal direction of the handle, and the cord-like body at hand which is wound around the pulley mechanism is close to the counterpart pulley. By wrapping in order from the arranged one, the number of wrapping of the string-shaped body in the pulley mechanism can be increased, the amplification factor of the cutting force can be increased, and the string-shaped body at hand can be taken out so as not to interfere. You can

Further, for one or both of the plurality of moving pulleys and the fixed pulleys, the pulleys arranged closer to the supporting member side of the other party are formed to have a smaller diameter, or a string-like body wound around the pulley mechanism. The guide surfaces for guiding the pulleys are sequentially shifted in the axial direction between the pulleys, and a groove is formed in each of these guide surfaces to prevent interference between the cord-shaped bodies wrapped around the pulleys, The string-like body can be pulled smoothly.

A fixed pulley supporting member to be inserted into the base end side of the handle is provided with a boss portion projecting from the base end side of the handle, and an extension handle is inserted into the boss portion to add a boss portion to cut a high branch. Can be used.

[Brief description of drawings]

FIG. 1 is a front view showing a branch cutting scissors according to a first embodiment.

FIG. 2 is a partially cutaway front view showing an enlarged tip portion of the branch cutting scissors of FIG.

3 is an enlarged front sectional view showing the inside of the handle of FIG. 1, and b is a side sectional view of a.

FIG. 4A is a front sectional view showing the inside of the branch cutting scissors handle of the second embodiment, and b is a side sectional view of a.

FIG. 5 is a front view showing a conventional branch cutting scissors.

[Explanation of symbols]

1 pattern 2 Support 3 Branch receiver 4 Receiving member 5 screws 6 cutting edges 7 Cutting blade member 8 and 9 arms 10 strings 11 branches 12 coil spring 13 string hole 14 Roller guide 15 Moving pulley support member 16 Fixed pulley support member 17 Boss 18 Handle for extension 19 Side plate 20, 21 Pillar 22a, 22b, 22c movable pulley 23 Collar 24 Side plate 25a, 25b fixed pulley 26 pillars 27 strings 28 String passing hole 29a, 29b, 29c Moving pulley 30 groove 31a, 31b Fixed pulley 32 groove

Claims (3)

(57) [Claims] 1. A cutting blade member having a cutting blade that engages and separates from the branch receiving portion is pivotally attached to a receiving member having a hook-shaped branch receiving portion provided on the tip side of the handle. The member is urged by a spring in a direction in which the cutting blade separates from the branch receiving portion, and the first string-shaped body is directly or indirectly connected to the cutting blade member. In the branch cutting scissors for pivoting the cutting edge toward the branch receiving portion by applying a traction force to the branch, the handle is formed in a tubular shape, and the moving pulley supporting member in which the moving pulley is arranged is placed in the handle. A fixed pulley supporting member having a fixed pulley arranged therein is slidably accommodated in the longitudinal direction, the first string-shaped body connected to the cutting blade member is guided into the handle and connected to the moving pulley supporting member, insert the base end side of the handle, and fixed by facing the movable pulley support members, said DoNamera
At least one of a car and a fixed pulley is supported by the respective
A plurality of members are arranged along the longitudinal direction of the handle, and one end of the second string-like body is coupled to the moving pulley supporting member or the fixed pulley supporting member to be fixed to the plurality or singularly arranged moving pulleys. for the pulley, the support member side of each of the counterpart
By alternately winding the pulleys arranged close to each other, taking the other end out of the handle, and pulling the second string-like body, the cutting blade is pivoted toward the branch receiving portion. Pruning scissors characterized by being made. Meanwhile wherein one of said plurality sequences were movable pulley and the fixed pulley, or both, debranching of claim 1 which is smaller in diameter as pulley arranged closer to the support member side of the other party to the opposing scissors. 3. With respect to either or both of the plurality of moving pulleys and fixed pulleys arranged, the guide surface of each pulley outer periphery for guiding the second string-shaped body is axially arranged between the pulleys. 3. The branch cutting scissors according to claim 1 or 2 , wherein the cutting grooves are shifted and each of these guide surfaces is formed with a concave groove around which a second string-like body is wound.