JP5547700B2 - Replaceable blade pruning shears - Google Patents

Description

  The present invention relates to a pruning rod of a type called a anvil type that pushes a workpiece to be cut on a flat receiving floor with a cutting blade, and is an invention related to a replaceable blade pruning rod that can replace a blade plate. .

Conventionally, a replaceable blade type scissor capable of exchanging the blade plate is known. A conventional replaceable blade type scissor is a type of scissors that cuts an object by opening and closing a pair of blades that are pivotally supported at one point, and the replaceable blade itself is usually pivotally supported. .
Patent Document 1 includes a U-shaped notch that includes a U-shaped notch and a blade that is a replacement blade and a blade that is a replacement blade, and is fixed with a set screw. A scissor with a spindle passing through the part is disclosed. The U-shaped notch of the accessory plate has a width through which the shaft portion of the support shaft passes and the head does not pass, and the support shaft hole of the blade body is large enough to pass not only the shaft portion of the support shaft but also the head portion. It is said. A structure is disclosed in which a handle body to which the accessory plate is secured is removed by removing the accessory plate and the set screw of the blade body, and the blade body is passed through the head of the support hole to be attached and detached.

In Patent Document 2, a long hole having a large diameter portion and a small diameter portion is formed in a handle, and the large diameter portion of the long hole formed in the handle is passed through a spindle having a head. The idea that the blade body can be attached and detached in the same manner as in Patent Document 1 by making it detachable and removing the handle is disclosed.
Patent Document 3 discloses a structure in which an insertion groove is formed in a handle portion including a screw hole portion, and a slimming portion is inserted into the insertion groove to be pivotally supported.

JP-A-8-257259 JP-A-8-89670 JP-A-8-89669

  The conventional blades disclosed in Patent Documents 1 to 3 each have a pair of blades pivotally supported by a support shaft that opens and closes around the support shaft. Both have shaft support holes. Such a replaceable blade has a drawback in that the shaft support state changes by exchanging the blade body, and a tightening state suitable for cutting cannot always be maintained. Therefore, when the blade body is replaced, a suitable cutting state cannot be maintained unless the tightening state is adjusted one by one. Since it is difficult to maintain a contact state, that is, a good cutting state, there has been a drawback that the blade body is not always easily replaced.

  Moreover, the above-mentioned spare blades of the prior art each cut by a sliding rotation of a pair of blades pivotally supported by a support shaft, and push an object to be cut on a flat receiving floor. It is not a pruning shear. Furthermore, when using a scissors by sliding the blade supported at one point as a pruning scissors, the object to be cut between the pair of blades should be cut off due to the crossing angle of the blades. There is a drawback that the object to be cut escapes ahead when cutting a slightly thick branch or the like, and the cutting force is difficult to cut.

In view of the above disadvantages of the prior art, the present invention realizes a replaceable blade type in a pruning shear of a type in which an object to be cut on a receiving floor is pushed by a cutting blade.
Then, it is an object to realize a replaceable blade type pruning scissor that can more easily replace the blade body and does not need to adjust the tightening state of the shaft like a conventional replaceable scissors. Moreover, since a comparatively thin blade body can be used as a replacement blade in a stable state, the object is to provide an economical replacement blade with excellent sharpness.

  According to the first aspect of the present invention, which achieves the object of the present invention, the first handle body 1 and the second handle body 2 are pivotally supported by the main shaft 3, and the first handle body 1 is located at a position ahead of the pivot support position. A receiving floor 4 is formed. The first handle 1 that is pivotally supported by the main handle 3 and the second handle 2 is in a state in which the open edge of the back metal 5 having a substantially U-shaped cross section at the base rather than the pivot support position faces the receiving floor 4. Then, the base end portion of the back metal 5 is pivotally supported by the back metal shaft 6, and the front position of the second handle 2 and the front position of the back metal 5 are connected by the link rod 7. A replaceable blade 8 is formed on the other side edge of the replaceable blade 8 that is supported by the U-shaped folded edge 5a of the back metal 5 and protrudes from the open edge of the U-shaped back metal. The cutting blade 9 is detachably mounted so as to face the receiving floor 4, and the cutting edge 8 of the replaceable blade 7 is pressed against the receiving floor 4 by closing the first pattern body 1 and the second pattern body 2. This is a replaceable blade pruning shear.

  The invention according to claim 2 is the invention according to claim 1, wherein an engagement portion 10 that is a notch that opens toward the base and narrows toward the tip is formed at the base end of the replaceable blade 8. The engaging portion 10 is supported on the back metal shaft 6 and fixed through the back metal 6 and the replacement blade 8 at the front position of the back metal 5 with the engaging portion 10 supported on the back metal shaft 6. It is fixed by the shaft 11.

  The invention described in claim 3 relates to a specific structure. The first patterned body 1 includes two first patterned plates 12 and 12 that are integrally fixed at a predetermined interval, and the back metal 5 is sandwiched between the two first patterned plates 12 and 12. Place. The second pattern body 2 includes two second pattern plates 13 and 13 that are integrally fixed at a predetermined interval that can be disposed between the two first pattern plates 12 and 12. The second handle plates 13 and 13 are positioned between the plates 12 and 12 and supported by the main shaft 3. Then, one end of the link rod 7 is pivotally supported between the second handle plates 13 and 13, and the other end of the link rod 7 is inserted between the side walls 5b and 5b of the back metal 5 bent in a U shape. It is to let you.

  Invention of Claim 4 is forming the receiving floor 4 formed in the front part of the 1st pattern body 1 with a synthetic resin material. In the invention according to claim 5, the receiving floor 4 formed of a synthetic resin material includes a main body portion 4a positioned between the two first handle plates 12, 12, and the two first handle plates 12, 12. The structure is provided with a flange 4b supported on the upper edge.

  According to the first aspect of the invention, the replacement blade 8 can be easily replaced by detachably mounting the replacement blade 8 on the back metal 5 having a substantially U-shaped cross section. At this time, the back metal 5 fitted with the replaceable blade 8 is not pivotally supported by the main shaft 3, but the base end is pivotally supported by the back metal shaft 6 at the base rather than the axial support position of the first handle 1. The The second handle 2 and the back metal 5 are connected by a link rod 7 at a position ahead of the pivotal support position by the main shaft. That is, the back metal 5 rotates about the back metal shaft 6 located behind the main shaft 3, and the cutting blade 9 of the replaceable blade 8 protruding from the open edge of the back metal 5 is pressed onto the receiving floor 4. .

Therefore, in the process leading to cutting, the angle formed between the receiving floor 4 and the cutting edge 9 can be set to an angle that is not greatly opened forward, so that the object to be cut is not easily pushed outward. Further, since the back metal 5 is driven by a link mechanism with a link rod 7 interposed, there is an effect that a large cutting force can be obtained by pressing the cutting blade 9 onto the receiving floor 4 with a larger force.
Furthermore, one side edge of the replacement blade 8 is firmly supported by the return edge 5a of the back metal 5 having a substantially U-shaped cross section, and both sides are held by the side surfaces 5b, 5b of the back metal 5, so A relatively thin blade plate can be used as the blade. Therefore, there is an effect that the replacement blade 8 provided with the sharper cutting blade 9 can be provided at low cost.

According to the second aspect of the present invention, the engaging portion 10 of the replaceable blade 8 is engaged with the back metal shaft 6 from the front of the back metal 5 toward the base, and a screw or the like is fixed at the front position of the back metal 5. By fixing with the shaft 11, the replaceable blade 8 can be easily and reliably mounted.
That is, even if the replaceable blade 8 is not necessarily in an accurate position, even if it is inserted at a slightly deviated position, the replaceable blade 8 is guided to an accurate position by the engaging portion 10 and is fixed by the fixed shaft 11. The state can be maintained.

  According to the third aspect of the present invention, the back metal 5 having a substantially U-shaped cross section on which the replacement blade 8 is mounted is held between the first handle plates 12 and 12 and the receiving floor 4 is the first handle plate. 12 and 12 are held. And the center position of the thickness direction of the 1st pattern body 1 and the 2nd pattern body 2 corresponds, and the link rod 7 which transmits motive power is also on the same plane as the center position of the 1st pattern body 1 and the 2nd pattern body 2. Located in. That is, all the structures are symmetrical with respect to the center in the thickness direction, and no twisting force acts between the first pattern body 1 and the second pattern body 2 during the turning operation for cutting. In other words, when the workpiece on the floor 4 is cut, no twisting force is applied to the cutting blade 9, so that it is difficult to cause spilling of the blade, and the relatively thin sharp replacement blade 8 is used for cutting with a light force. It becomes possible to do.

According to the invention described in claim 4, by making the receiving floor 4 made of a synthetic resin, there is a possibility that the cutting edge 9 is spilled or worn compared to the case where the cutting edge is pressed against a metal receiving floor. There is an effect that the good sharpness of the spare blade 8 can be maintained for a long time.
According to the fifth aspect of the present invention, the synthetic resin receiving floor 4 can be stably and securely disposed at the front position of the first handle 1.

FIG. 1 is a front view of the entire replaceable blade pruning shears in a state in which the first handle and the second handle showing the embodiment of the present invention are closed, FIG. 2 is a front view of the entire replaceable blade pruning ridge with the shaft cover omitted and the first handle and the second handle opened. FIG. 3 is a longitudinal sectional view showing a state in which the first pattern body and the second pattern body are closed, FIG. 4 is a longitudinal sectional view of the first pattern body and the second pattern body opened. FIG. 5 is an enlarged cross-sectional view of the tip portion of the heel, showing a state where the replacement blade is removed, FIG. 1 is an enlarged sectional view taken along line VI-VI. FIG. 1 is an enlarged sectional view taken along line VII-VII, It is a VIII-VIII ship expanded sectional view of FIG.

Hereinafter, embodiments of the replaceable blade type pruning shears according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of an entire replaceable blade type pruning rod in a state in which a first pattern body and a second pattern body are closed, showing an embodiment of the present invention, and FIG. FIG.

  The replaceable blade type pruning shears according to the present invention pivotally support the first handle 1 and the second handle 2 with the main shaft 3, and form the receiving floor 4 at a portion ahead of the pivot support position of the first handle 1. . The first handle 1 that is pivotally supported by the main shaft 3 and the second handle 2 has an open edge of the back metal 5 having a substantially U-shaped cross section at the base than the pivot support position by the main shaft 3. The base end portion of the back metal 5 is pivotally supported by the back metal shaft 6 in the oriented state. A replaceable blade 8 having a thickness that can be inserted between the side walls 5b and 5b is attached to the back metal 5 having a substantially U-shaped cross section. The replaceable blade 8 has one side edge supported by the U-shaped folded edge 5a of the back metal 5 and the cutting blade 9 formed on the other side edge protrudes from the open edge of the U-shaped back metal to the receiving floor 4. Make them face each other.

  The second handle 2 is connected by a link rod 7 between the position ahead of the pivot support position of the first handle 1 and the lower end of the back metal 5. That is, as shown in FIG. 4, one end of the link rod 7 is pivotally supported on the second handle 2 by the support shaft 15, and the other end of the link rod 7 is supported by the support shaft 16 on the lower end of the back metal 5. Pivot. By setting it as this structure, when the 1st pattern body 1 and the 2nd pattern body 2 are closed, the cutting blade 9 of the replacement blade 8 will be pressed by the receiving floor 4, and the to-be-cut object on the receiving floor 4 can be cut | disconnected. . The force that acts on the cutting blade 9 to cut the workpiece acts as a force that presses the replacement blade 8 against the U-shaped folded edge 5a of the back metal 5, and the replacement blade itself is stabilized integrally with the back metal. .

As shown in FIG. 4, the force F applied to the link rod 7 by the second handle _{2 is} a ratio of the distance L ₁ between the main shaft 3 and the support shaft 15 and the distance L ₂ between the back metal shaft 6 and the support shaft 16. Since it is enhanced by L ₂ / L ₁ , the workpiece can be cut with a light force. A force F is applied to the link rod 7 by grasping the first pattern body 1 and the second pattern body 2, but a spring 17 is disposed between the first pattern body 1 and the second pattern body 2 and is always attached in the opening direction. The lock claw 18 can maintain a normally closed state.

  At this time, the back metal 5 rotates around the back metal shaft 6 at a position behind the main shaft 3. That is, since it rotates with respect to the receiving floor 4 formed at the front of the first handle 1 with the position above the extension line of the receiving floor 4 as a fulcrum, in the process leading to cutting, the receiving floor 4 and the cutting blade Since the angle formed by 9 is an angle that is not largely opened forward, the object to be cut can be hardly pushed outward. However, the direction of the cutting edge 9 of the replaceable blade 8 attached to the back metal 5 is set so that the direction of the cutting edge 9 and the receiving floor 4 coincide when the cutting edge 9 rotates on the receiving floor 4. Keep it.

  As long as the replacement blade 8 is mounted so as not to drop off the back metal 5, the locking means can be designed arbitrarily. In the illustrated embodiment, as shown in FIG. 5, an engaging portion 10 that is a notched portion that opens toward the base and narrows toward the tip is formed at the base end portion of the replaceable blade 8. The back metal shaft 6 is supported. As a result, as shown by the arrow in FIG. 5, the replaceable blade 8 that is attached to the back metal 5 and pushed from the front to the base is stabilized at the fixed position of the engaging portion 10. As shown in FIGS. 1 to 3, the replaceable blade 8 mounted on the back metal 5 is fixed by a fixed shaft 11 that penetrates the back metal 5 and the replaceable blade 8 at a position ahead of the back metal 5. As shown in FIG. 7, the replaceable blade 8 and the back metal 5 are fastened and fixed using, for example, screws as the fixed shaft 11. With this structure, the replacement blade 8 is firmly fixed to the back metal 5 and can perform a stable cutting operation without rattling.

  The first handle 1 is composed of two first handle plates 12 and 12 that are integrally fixed at a predetermined interval. The outer periphery of the base that becomes the gripping portion of the first handle plates 12 and 12 is shown in FIG. As shown in FIG. 4, the synthetic resin material 19 is easy to hold as a grip handle. The back metal 5 is configured to rotate around the back metal shaft 6 in the space between the two first pattern boards 12 and 12 as shown in FIG. . FIG. 8 shows an embodiment in which the two first handle plates 12 and 12 and the synthetic resin material 19 are fixed with screws 20, but the first handle plates 12 and 12 are insert-molded into the synthetic resin material 19. The screw 20 can be omitted.

  The second handle 2 is composed of two second handle plates 13 and 13 that are integrally fixed at a predetermined interval that can be arranged between the first handle plates 12 and 12 described above. The outer periphery of the base that becomes the gripping portion of the second handle plates 13 and 13 is formed of a synthetic resin material 21 that is easy to hold as a gripping handle as shown in FIG. The second pattern boards 13 and 13 and the synthetic resin material 21 can be fixed by insert molding or screws 22. When the second handle plates 13 and 13 are insert-molded into the synthetic resin material 21, the screws 22 can be omitted.

  As shown in FIG. 6, the tip portion of the second pattern body 2 composed of the second pattern plates 13, 13 is arranged by positioning the second pattern plates 13, 13 between the first pattern plates 12, 12. It is supported by. At this time, one end of the link rod 7 is positioned between the second handle plates 13 and 13, and the second handle plates 13 and 13 and the link rod 7 are pivotally supported by the support shaft 15. The other end of the link rod 7 is inserted between the side walls 5b, 5b of the back metal 5 bent in a U shape, and the back metal 5 and the link rod 7 are supported by the support shaft 16. And the replaceable blade 8 inserted between the side walls 5b and 5b of the back metal 5 is located on the same plane as the link rod 7.

  With this configuration, there is no possibility that a twisting force acts between the first pattern boards 12 and 12 and the second pattern boards 13 and 13, and the back metal 5 located between the second pattern boards 13 and 13. Further, there is no possibility that a twisting force acts on the replacement blade 8. Therefore, the force that grips and acts on the first handle 1 and the second handle 2 acts as a force that pushes the cutting edge 9 of the replaceable blade 8 straight against the floor 3. While being able to cut | disconnect a to-be-cut object effectively, there is little possibility that a cutting edge 9 will produce a blade spill. Therefore, a relatively thin and sharp blade can be used as a replacement blade.

  The cutting blade 9 of the replaceable blade 8 is pressed straight against the flat receiving floor 4 as shown in FIG. At this time, the receiving floor 4 may be made of a hard metal, but by using a strong synthetic resin, damage such as spillage of the cutting edge 9 can be effectively prevented. In other words, a sharper blade can be used as a replacement blade for pruning shears. The material of the synthetic resin material may be a general-purpose synthetic resin material such as ABS resin or polyethylene resin, but higher-strength engineer plastic can be used.

  As shown in FIG. 7, the receiving floor 4 formed of a synthetic resin material disposed at the front of the first pattern body 1 is formed with flanges 4 b and 4 b on both sides of the upper portion, and the two first pattern plates 12, The main body portion 4a is positioned between 12 and the flange portions 4b and 4b are supported on the upper edges of the first pattern plates 12 and 12. By adopting this structure, the upward force acting on the floor 4 is reliably supported by the first pattern board 12, and does not act as a force for pushing the floor between the first pattern boards 12 and 12 downward. In order to prevent rattling and blind movement of the receiving floor 4, the main body 4 a portion of the receiving floor 4 and the second handle plates 12, 12 are penetrated and fixed with screws 23.

  The first pattern body 1 and the second pattern body 2 have the outer surface formed of a synthetic resin material 19 or 20 at the base rather than the mechanism portions such as the main shaft 3 and the back metal shaft 6 which are gripping portions. In the portion, the link rod 7 and the main shaft 3 are exposed. If the mechanism part such as the link rod 7 is exposed, there is a risk of crushing fingers. Therefore, the entire mechanism part is covered with the shaft covers 14 and 14 so that the drive part is not exposed. The shaft covers 14, 14 use a main shaft 3 that pivotally supports the first pattern body 1 and the second pattern body, and a back metal shaft 6 that pivotally supports the first pattern body 1 and the back metal 5. The first handle plates 12 and 12 constituting the body 1 are in contact with the outer side surfaces of the first pattern plates 12 and 12 and fixed integrally.

  The replacement blade of the pruning shears according to the present invention can be disposable. In this case, according to the present invention, a replacement blade sharply polished with a relatively thin blade plate can be provided at low cost, and a sharp cutting situation can always be realized. And, the replaceable blade of the relatively thin blade plate is firmly supported by the side walls 5b, 5b of the back metal 5 on both the left and right sides. Cutting work can be done with the same feeling. In FIG. 5, 24 is a through hole formed in the replaceable blade 8 for allowing the fixed shaft 11 to pass, and 25 is a screw hole for screwing the fixed shaft 11.

DESCRIPTION OF SYMBOLS 1 ... 1st pattern body, 2 ... 2nd pattern body, 3 ... Main axis | shaft, 4 ... Receiving floor, 4a ... Main part, 4b ... Gutter part, 5 ... Back metal, 5a ... U-shaped folding edge, 5b ... Side wall, 6 ... Back metal shaft, 7 ... Link rod, 8 ... Replacement blade, 9 ... Cutting blade, 10 ... Engagement portion, 11 ... Fixed shaft, 12 ... First handle plate, 13 ... Second handle plate, 14 ... Shaft portion Covers 15, 16 ... support shafts, 17 ... springs, 18 ... lock claws, 19, 21 ... synthetic resin, 20, 22, 23 ... screws, 24 ... through shafts, 25 ... screw holes.

Claims (5)

  The first pattern body and the second pattern body are pivotally supported by the main shaft, and a receiving bed is formed at a part ahead of the first pattern body pivot support position, and from the first pattern body and the second pattern body pivot support position. The base end of the back metal is pivotally supported on the first pattern body by the back metal shaft with the open edge of the back metal having a substantially U-shaped cross section at the base facing the receiving floor. Connect the tip position and the tip position of the back metal to the first handle with a link rod, and support the replacement blade against the back metal on one side edge of the U-shaped folded edge of the back metal. The cutting blade formed on the other side edge of the replaceable blade protruding from the open edge of the U-shaped back metal is detachably mounted so as to face the receiving floor, and the first pattern body and the second pattern body are mounted. A replaceable blade-type pruning shear that presses the cutting blade of the replaceable blade against the floor by closing.   An engaging portion that is a notch that opens toward the base and narrows toward the tip is formed at the base end of the replaceable blade, and the engaging portion is supported by the back metal shaft, and the engaging portion is 2. The replaceable blade type pruning according to claim 1, wherein the back metal and the replaceable blade are fixed by a fixed shaft that penetrates the back metal and the replaceable blade at a tip position of the back metal while being supported by the back metal shaft. scissors.   The first handle comprises two first handle plates that are integrally fixed at a predetermined interval, and a back metal is disposed in a manner that is sandwiched between the two first handle plates, Comprises two second pattern plates that are integrally fixed at a predetermined interval that can be arranged between the two first pattern plates, and the main shaft is positioned between the first pattern plates with the second pattern plate positioned between them. And one end of the link rod was pivotally supported between the two second handle plates, and the other end of the link rod was pivotally inserted between the side walls of the back metal bent in a U shape. The replaceable blade type pruning shears according to claim 1 or 2.   The replaceable blade pruning shears according to any one of claims 1 to 3, wherein the receiving floor formed on the front portion of the first handle is formed of a synthetic resin material.   The receiving floor formed in the front part of the first pattern body is provided with a main part located between the two first pattern boards and a collar part supported on the upper edges of the two first pattern boards. The replaceable blade type scissors according to claim 4 characterized by the above-mentioned.

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