JPH0728608B2 - Takaeda cutting scissors - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high branch cutting scissors having enhanced cutting force.

[0002]

2. Description of the Related Art Conventionally, as a high-branch cutting scissors capable of cutting a branch at a high place from the ground, for example, as shown in FIG. 7, a telescopic rod a whose length can be adjusted according to the height of the branch is used. At the tip of the blade, attach scissors consisting of a hook-shaped blade receiver b and a blade body c pivotally supported by the blade receiver b, and attach pulleys d and e to the end portion of the blade body c and the rod a, and attach the rope to the rope. There is one that cuts a branch by multiplying the rope with f and pulling this rope down from the ground.

[0003]

However, the conventional high-branch cutting scissors as described above cannot cut a thick branch because the cutting force is small. Except for uncertainties such as sharpness of blade, arm strength of user, etc., the cutting force of scissors is expressed by the ratio of the length of force point to fulcrum and fulcrum to action point when limited to the performance of equipment. be able to. Referring to FIG. 7, the operation of the high branch cutting scissors grips the rope overhead and pulls it down to the shoulder position. The range of reduction is 400-, though there are individual differences.
It is about 500 mm. If this is replaced with the force point of the blade of the high-branch cutting scissors using a pulley-the length of the fulcrum, 140-160 mm
Is. The diameter of the branch that can be cut with this depends on the material, but it is 20
A saw g is used for items having a size of about mm or more. But,
The saw does not cut well because the branch moves along with the saw at the middle of the branch or the tip of the branch. Also, it takes time to attach and remove. It is an object of the present invention to provide a compact high-branch cutting scissors having a stronger cutting force than the conventional one.

[0004]

In order to achieve the above object, the high-branch cutting scissors of the present invention has a hook-shaped blade receiving portion and a base portion attachable to the tip of a rod, and has a central portion at the center portion. A blade receiving member having a through hole formed therein, and an internal gear portion formed on the inner peripheral side of the arc portion rotatably supported by the blade receiving member, and a blade body portion provided on one side end portion. A fan-shaped blade member,
A spur gear that engages with the internal gear portion, and a pawl gear that is connected to the spur gear by a common shaft rod that passes through a through hole.
An arm member to which a pawl engaging with the pawl gear is attached and one end of which is rotatably supported by the common shaft rod; a pulley fixed to the other end of the arm member and to which an operating rope is hung; Is attached to the tip of the arm member and the other end is attached to the blade receiving member, respectively, and a return spring for returning the arm member to the original position, an outer end of the arm receiving member side and an inner end of the common shaft rod. Each of them is provided with a fixed spring spring and a reverse rotation preventing / releasing means for preventing the reverse rotation of the claw gear until the completion of cutting and canceling the reverse rotation of the claw gear at the cutting completion position of the blade member.

Further, the reverse rotation preventing / releasing means of the claw gear includes a locking pin for engaging the tooth portion of the claw gear and a locking pin support for oscillatingly supporting the locking pin urged by a first spring. And a locking pin holding means for holding the locking pin at the release position at the cutting completion position of the blade member, the locking pin support member and the locking pin holding member are provided by the rotation of the blade member. Configured to work.

Further, the claw gear reversing / releasing means is arranged around the through hole of the blade receiving member.

[0007]

As described above, the high-branch cutting scissors of the present invention cuts by repeating the rope pulling down operation 3 to 4 times, and the pulling down of the rope causes the arm member to rotate and the reverse rotation preventing engagement. The claw gear with which the pin engages is rotated in one direction via the claw, and the spur gear connected with the common shaft also rotates with it, and the fan-shaped blade member rotates to the cutting completion position. When it reaches, the locking pin that was engaged with the tooth portion of the pawl gear is held at the release position, and when the final operation rope is loosened and the arm member returns to the upper position, the pawl disengages from the pawl gear and is caught. The blade receiving member returns to the original position all at once by the elastic force of the mainspring which has been in the state.

[0008]

1 is a perspective view showing the whole of the high branch cutting scissors according to the present invention, FIG. 2 is an enlarged perspective view of the scissors portion viewed from the side opposite to FIG. 1, and FIG. 3 is an exploded view of the scissors portion. It is a perspective view. In the figure, reference numeral 1 denotes a blade receiving member, which has a hook-like blade receiving portion 1 at its tip.
Through hole 1 in which a is formed and a common shaft rod to be described later is inserted in the center part 1
An attachment portion 1c for fixing to the rod is provided at the base portion. Reference numeral 2 is a fan-shaped blade member having a blade portion 2a formed at one end thereof, and an internal gear portion 2b is formed inside the arc portion, and is rotatable on one surface of the blade receiving member 1 by a shaft 3. It is installed. Reference numeral 4 is a spur gear that engages with the internal gear portion 2b of the blade member 2, and the common shaft rod 5 is inserted into the shaft hole 4a and fixed. 6 is a claw gear fixed to the common shaft rod 5 together with the spur gear 4, and 7 is a claw of the claw gear 6, which is rotatably supported by a shaft 7a and urged by a spring 8 to be pressed against the tooth portion 6a of the claw gear 6. Has been done. Reference numeral 9 is an arm member made up of _two plates 9 ₁ and 9 ₂ having different lengths. A pawl gear 6 and a pawl 7 are mounted between the _two members, and a shaft hole 9c through which the common shaft rod 5 passes is sandwiched between the two members. Board 9 ₁ ,
9 ₂ is stuck. Reference numeral 10 is a spiral spring for returning the blade-shaped blade member 2 to the original position, the inner end of which is fixed to the common shaft rod 5 and the outer end of which is provided on the blade receiving member 1 and fixed to the fixing pin 11. It Reference numeral 12 is a return spring for returning the arm member to the original position, one end of which is the top portion 1 of the blade receiving member 1.
At d, the other end is attached to a mounting member 13 fixed to the tip of the arm member 9. Reference numeral 14 is a pulley attached to a mounting member 13, and a rope 15 for rotating the arm member 9 is hung on the pulley.

FIG. 4 is an exploded perspective view of the reverse rotation preventing / releasing mechanism portion of the pawl gear, where 16 is a tooth portion 6 of the pawl gear 6.
It is a locking pin support member that swingably supports the locking pin 17 that engages a and prevents reverse rotation, and is pivotally supported by the blade receiving member 1 through the shaft hole 16a. Reference numeral 18 denotes a spring for urging the locking pin 17 to press it against the tooth portion 6a of the pawl gear 6, and the blade receiving member 1
Is disposed in the groove 1e formed in the central part of the blade, one end of which is the protrusion 16b of the locking pin support member 16 and the other end of which is the blade receiving member 1.
It is attached to each side. 19 is a cutting completion position,
A hook actuating member for actuating a hook member 20 for holding the locking pin 17 at a position apart from the tooth portion 6a of the pawl gear 6, and is provided on the blade receiving member 1 together with the releasing member 16 at the shaft hole 19a. It is pivotally supported. The hook member 20 is axially supported by a pin 19d fixed to the tip of the hook actuating member at the shaft hole 20a, and is biased by a spring 21 in the direction of arrow B. A stopper 22 of the hook member 20 is fixed to the blade receiving member. Reference numeral 23 is a spring for urging the hook operating member 19 in the direction of arrow C, one end of which is attached to the projection piece 19d of the hook operating member and the other end of which is attached to the stopper 22.

Next, the operation of the high branch cutting scissors configured as described above will be described. The high-branch cutting scissors according to the present invention inserts a branch to be cut between the blade receiving portion 1a and the blade body portion 2a, and pulls down the rope 3 to 4 times for cutting. First, when the blade member 2 is at the return position, each member of the pawl gear 6 reverse rotation preventing / releasing mechanism is in the state shown in FIG. When the rope 15 is pulled down from this state and the arm member 9 is rotated downward, the claw 7 pushes the tooth portion 6a of the claw gear 6 and rotates in the same direction as the arm member 9. At this time, the crest portion of the tooth portion 6a of the claw gear 6 pushes the locking pin 17 against the bias of the spring 18 for each crest, but the releasing member 1 is required each time.
6 swings around the shaft hole 16a as a center of rotation,
The locking pin 17 does not prevent the pawl gear 6 from rotating. When the pawl gear 6 rotates in the direction of arrow A (FIG. 3), the spur gear 4 rotates via the common shaft rod 5, and the fan-shaped blade member 2 rotates about 25 to 30 degrees in the same direction. When the blade member 2 rotates about 15 degrees from the return position, the end 2c of the blade member 2 separates from the contact piece 19c of the hook operating member, and the spring 23 causes
Hook operating member 1 biased in the direction of arrow C (FIG. 5)
9 rotates in the arrow C direction with the shaft hole 19a as the center of rotation. Then, the hook member 20 pivotally supported on the tip end portion of the hook operating member 19 rotates in the direction of arrow D (FIG. 5) about the stopper 22 as a fulcrum, and as shown in FIG.
0b is projected from the inner peripheral surface 19d of the hook operating member 19.

When the rope 15 is loosened after pulling down the rope 15 to rotate the tip of the arm member 9 to the lower position, the pawl gear 6 tries to rotate in reverse by the Zemanui spring 10, but the tooth portion 6a of the pawl gear 6 is rotated. The locking pin 17 is engaged with the locking pin support member 16, and the locking pin support member 16 is prevented from rotating in the reverse direction by the stopper 1f (FIG. 3) provided on the protruding blade receiving member 1. 6 remains in its rotational position and only the arm member 9 is returned by the return spring 12 to its original upper position.

When the cutting operation of the rope 15 is repeated about three times and the blade member 2 approaches the cutting completion position, the blade member 2
End portion 2d (FIG. 3) of the contact pin contacts the contact piece 16c of the locking pin support member 16, the locking pin support member 16 rotates against the elastic force of the spring 18, and the locking pin 17 hooks. The hook member 20 hits the outer surface 20b of the tip portion of the member 20 and resists the elastic force of the spring 21, and the hook member 20 uses the shaft 20a as a rotation axis (see FIG. 6).
The tip 20c is pushed down, the arm member 9 is turned downward by the last pulling operation, and the blade member 2 is rotated.
Rotate to the position where the cutting is completed, and the locking pin 17
When it reaches the inside of the hook beyond 0c, the abutting portion 20d of the hook 20 is rotated by the elastic force of the spring 21 until it abuts on the stopper 22, the tip 20c is lifted and the locking pin 17 is held, and the locking pin 17 is held. The engagement of the pawl gear 6 of 17 with the tooth portion 6a is released.

When the rope 15 which has been pulled down is loosened and the arm spring 9 is returned to the upper position by the return spring 12, the projection 7b of the claw 7 is brought into contact with the contact portion 1g provided above the blade receiving member 1. As a result, the pawl 7 is rotated, the engagement with the pawl gear 6 is released, and the spiral spring 1 is caught.
With the elastic force of 0, the blade member 2 returns to its original position and returns to the original state.

[0014]

As described above, according to the high-branch cutting scissors of the present invention, the shaft supporting portion of the arm member and the gears for rotationally driving the blade are attached to the central portion of the blade receiving member. Therefore, the whole can be made compact and the branch cutting work becomes easy. In addition, since the rotary shafts of the internal gear, the pawl gear, and the arm member are pivotally attached to the common rotary shaft, the number of parts can be reduced and the assembly is easy, so that the manufacturing cost can be reduced. It is also structurally stable and has excellent effects such as increased durability.

[Brief description of drawings]

FIG. 1 is a perspective view showing the whole of high branch cutting scissors according to the present invention.

FIG. 2 is an enlarged perspective view of a scissors portion viewed from the opposite side to FIG.

FIG. 3 is an exploded perspective view of a scissors portion.

FIG. 4 is an exploded perspective view of a ratchet release mechanism portion.

FIG. 5 is an operation explanatory view of a ratchet release mechanism portion.

FIG. 6 is an operation explanatory diagram of a ratchet release mechanism portion.

FIG. 7 is a perspective view showing an example of conventional high branch cutting scissors.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blade receiving member, 1a ... Blade receiving part, 2 ... Blade member, 2a
... Blade part, 2b ... Internal gear part, 4 ... Spur gear, 5 ... Common shaft rod, 6 ... Claw gear, 7 ... Claw, 9 ... Arm member, 10 ... Spring spring, 12 ... Return spring, 14 ... Pulley, 15 ... rope, 16 ... locking pin support member, 17 ... locking pin, 19 ...
Hook operating member, 20 ... Hook member.

Claims (4)

[Claims] 1. A blade receiving member having a hook-shaped blade receiving portion, a base portion attachable to a tip of a rod, and a through hole formed in a central portion thereof, and a pivotally rotatably supporting member with respect to the blade receiving member. An internal gear portion is formed on the inner peripheral side of the arc portion, and a blade-shaped blade member having a blade portion at one side end, a spur gear that engages with the internal gear portion, and the penetrating portion. A pawl gear connected to the spur gear by a common shaft rod passing through the hole; an arm member having a pawl engaged with the pawl gear and having one end rotatably supported by the common shaft rod; A pulley fixed to the other end of the arm member and hung with an operating rope, and a return spring having one end attached to the tip of the arm member and the other end attached to the blade receiving member to return the arm member to the original position. The outer end is fixed to the blade receiving member side and the inner end is fixed to the common shaft. A high-branch cutting scissors comprising my spring and reverse rotation preventing / releasing means for preventing the reverse rotation of the pawl gear until the completion of cutting and for canceling the reverse rotation of the pawl gear at the cutting completion position of the blade member. 2. The reverse rotation preventing / releasing means of the pawl gear includes a locking pin that engages with a tooth portion of the pawl gear and a locking pin that is urged by a first spring to swingably support the locking pin. A pin support member and a locking pin holding means for holding the locking pin in the release position at the cutting completion position of the blade member, and the locking pin support member and the locking pin holding member are blade members. The high-branch cutting scissors according to claim 1, wherein the high-branch cutting scissors are operated by the rotation of the. 3. The locking pin holding means is pivotally supported swingably, is urged by a second spring, and is rotatably supported by a tip end portion of the hook activating member, and is a third spring. The high branch cutting scissors according to claim 2, further comprising a hook member biased by. 4. The high-branch cutting scissors according to claim 1, wherein the pawl gear reversing / releasing means is mounted around the through hole of the blade receiving member.