JP5252875B2 - Horticultural hair clipper and blade assembly used for it - Google Patents

Description

  The present invention relates to a gardening hair clipper used for trimming a lawn or a hedge.

Patent Documents 1 and 2 describe a gardening hair clipper. The gardening hair clipper includes a main body and a pair of blades provided on the main body. At least one of the blades is supported to be swingable with respect to the main body. The main body has a built-in power source that reciprocates at least one of the blades, and the power source relatively moves the pair of blades reciprocally.
In each blade, a plurality of blade forming portions having blade edges on the side portions are formed in a comb shape, a plurality of blade edges formed on one blade, and a plurality of blade edges formed on the other blade, A plurality of blade tip pairs are configured. Each pair of blade tips is repeatedly opened and closed in accordance with the relative reciprocal angular movement of the pair of blades, and repeatedly cuts plants such as lawns and hedges.

JP 2004-147562 A JP 7-194224 A

In a gardening clipper, it is desirable that all pairs of cutting edges formed on a pair of blades slide while contacting with sufficient pressure. However, with conventional horticultural clippers, there are blade pairs where the blade edge and blade edge are not in contact with sufficient pressure. It has become.
The present invention solves the above problems. The present invention provides a technique for embodying a horticultural hair clipper in which all pairs of cutting edges formed on a pair of blades are in contact with each other with sufficient pressure.

A horticultural hair clipper embodied by the present invention includes a main body, a pair of blades that are provided on the main body and at least one of which is swingably supported, and a pair of blades that are built in the main body and relatively Is provided with a power mechanism for reciprocating angular movement. Each blade has a plurality of blade forming portions each having a cutting edge on its side portion formed in a comb shape. In one of the pair of blades, each of the plurality of blade forming portions is curved with a predetermined radius of curvature from the base portion to the tip end on the other blade side, and the curvature radius of at least one blade forming portion is the other blade. It differs from the curvature radius of a formation part.

  When the blade forming portion of one blade is curved as described above, the contact pressure of the pair of blade tips formed in the pair of blades can be significantly increased. However, the amount of change that occurs in the contact pressure of the blade tip pair with respect to the amount of bending applied to the blade forming portion varies depending on the position and shape of the blade forming portion. For this reason, for example, if all the blade forming parts are bent with the same radius of curvature, the cutting edge and the cutting edge come into contact with each other with a sufficient pressure in some cutting edge pairs, but the cutting edge and the cutting edge are not suitable in some cutting edge pairs. A contact with sufficient pressure can occur. At this time, by selectively changing the radius of curvature of at least one blade forming portion, it is possible to increase the contact pressure of the blade tip pair in which the blade tip contacts the blade tip with insufficient pressure. And it becomes possible to make all the blade edge | tip pairs comprised by a pair of blade contact with sufficient pressure.

In the horticultural hair clipper described above, it is preferable that, in one of the pair of blades, the radius of curvature of the blade forming portion located closest to the center and the radius of curvature of the blade forming portions located at both ends are different from each other.
As described above, the amount of change that occurs in the contact pressure of the pair of blade tips with respect to the amount of bending applied to the blade forming portion varies depending on the position and shape of the blade forming portion. Therefore, in the plurality of blade forming portions formed in a comb shape, it is preferable that the curvature radii of the blade forming portions located at both ends and the curvature radii of the blade forming portions located on the most central side are different from each other. Thereby, it becomes possible to make all the blade edge | tip pairs comprised by a pair of blades contact with more sufficient pressure.

Further, in one of the pair of blades, it is preferable that the radius of curvature of the blade forming portions positioned at both ends is smaller than the radius of curvature of the blade forming portion positioned at the most central side.
According to this form, it becomes possible to make all the blade edge | tip pairs comprised by a pair of blades contact with more sufficient pressure.

In addition, it is more preferable that one of the pair of blades has a smaller radius of curvature as the blade forming portions are located at both ends.
According to this form, it becomes possible to make all the blade edge | tip pairs comprised by a pair of blades contact with more sufficient pressure.

In the horticultural hair clipper according to the present invention, it is preferable that the other of the pair of blades is curved in a concave shape with respect to one of the pair of blades. In this case, it is more preferable that the other of the pair of blades is curved in a cylindrical surface shape along a direction in which the plurality of blade forming portions are arranged in a comb shape. Compared with the case where is flat, it is possible to significantly increase the contact pressure of the pair of cutting edges formed by the pair of blades.

The technique of the present invention is also embodied in a blade assembly for use in a gardening clipper. The blade assembly includes a pair of blades that are swingably supported with respect to each other. Each blade has a plurality of blade forming portions each having a blade edge formed on a side thereof in a comb shape. In one blade, each of the plurality of blade forming portions is curved with a predetermined radius of curvature from the base portion to the tip end on the other blade side . Further, the radius of curvature of the blade forming portion positioned at both ends is smaller than the radius of curvature of the blade forming portion positioned closest to the center, and the curvature radius of the blade forming portion positioned at both ends is smaller. On the other hand, the other blade is concavely curved with respect to the one blade .
In this blade assembly, it becomes possible for all pairs of cutting edges formed in a pair of blades to contact with each other with sufficient pressure.

  According to the present invention, it becomes possible to contact all pairs of cutting edges configured in a pair of blades with sufficient pressure, and the trimming ability of the gardening clipper can be significantly improved.

First, the main features of the embodiments described below are listed.
(Mode 1) Each of the pair of blades is provided so as to be swingable with respect to the main body.
(Mode 2) Each of the pair of blades has a mirror-symmetric shape.
(Mode 3) The power mechanism built in the main body reciprocates the pair of blades with a phase difference of 180 degrees from each other.
(Mode 4) The blade assembly is configured to be detachable from the main body.

Example 1
A lawn hair clipper embodying the present invention will be described with reference to the drawings. A lawn hair clipper is a type of gardening hair clipper, and is mainly used for lawn mowing.
FIG. 1 shows a side cross-sectional view of a lawn hair clipper 10. FIG. 2 shows a bottom view of the lawn hair clipper 10. In FIG. 2, a part of the configuration is omitted, and the internal structure of the lawn clipper 10 is shown.
As shown in FIGS. 1 and 2, the lawn hair clipper 10 includes a main body 12 and a blade assembly 30 fixed to the main body 12. The main body 12 mainly includes a housing 14, a trigger switch 16 provided in the housing 14, a motor 18 incorporated in the housing 14, a gear group 20 that decelerates and outputs the rotational motion of the motor 18, A first eccentric cam 22 and a second eccentric cam 24 that are rotated by the gear group 20 are provided. The first eccentric cam 22 and the second eccentric cam 24 rotate eccentrically with a phase difference of 180 degrees from each other about the rotation shaft 23 as a rotation center. The diameter of the first eccentric cam 22 is larger than the diameter of the second eccentric cam 24. In the main body 12, when the operator operates the trigger switch 16, the first eccentric cam 22 and the second eccentric cam 24 are eccentrically rotated by the motor 18.

The configuration of the blade assembly 30 will be described with reference to FIGS. 1, 2, and 3. FIG. 3 shows only the blade assembly 30 alone. As shown in FIG. 3, the blade assembly 30 has a mirror-symmetric structure with the AA line as the axis of symmetry. Hereinafter, in the blade assembly 30, a direction parallel to the symmetry axis AA is defined as the front-rear direction, and a direction perpendicular to the symmetry axis AA is defined as the left-right direction.
The blade assembly 30 includes a mounting plate 32, an upper blade 40, and a lower blade 70. The mounting plate 32, the upper blade 40, and the lower blade 70 are connected to each other by a fulcrum pin 34. The mounting plate 32, the upper blade 40, and the lower blade 70 can swing independently of each other with the center axis R of the fulcrum pin 34 as the center axis. A spacer member 36 is interposed between the rear end of the upper blade 40 and the rear end of the lower blade 70, and the relative angle between the upper blade 40 and the lower blade 70 is adjusted to a predetermined value.
The blade assembly 30 is fixed to the main body 12 by a plurality of screws 28 and can be attached and detached by a user. The blade assembly 30 is a consumable that deteriorates due to progress of wear or the like. The deteriorated blade assembly 30 is replaced with a new blade assembly 30 by a user or the like.

  A long hole-shaped fitting hole 42 is formed in the rear portion of the upper blade 40 from the fulcrum pin 34, and the first eccentric cam 22 of the main body 12 is loosely fitted in the fitting hole 42. As a result, the upper blade 40 reciprocates about the swinging central axis R as the first eccentric cam 22 rotates eccentrically. Similarly, a long hole-shaped fitting hole 72 is formed in the rear portion of the lower blade 70 from the fulcrum pin 34, and the second eccentric cam 24 of the main body 12 is fitted into the fitting hole 72. ing. As a result, the lower blade 70 reciprocates about the swinging central axis R as the second eccentric cam 24 rotates eccentrically. Since the first eccentric cam 22 and the second eccentric cam 24 rotate eccentrically with a phase difference of 180 degrees, the upper blade 40 and the lower blade 70 reciprocate with a phase difference of 180 degrees. Further, since the first eccentric cam 22 has a larger diameter than the second eccentric cam 24, the upper blade 40 reciprocates with a larger amplitude than the lower blade 70.

The configuration of the upper blade 40 will be described with reference to FIGS. 4, 5, 6, 7, and 8. FIG. 4 shows only the upper blade 40 alone. FIG. 5 shows an end view taken along line VV in FIG. FIG. 6 shows an end view taken along line VI-VI in FIG. FIG. 7 shows an end view taken along line VII-VII in FIG. FIG. 8 shows an end view taken along line VIII-VIII in FIG. As shown in FIG. 4, the upper blade 40 has a mirror-symmetric shape with the straight line AA as an axis of symmetry. Hereinafter, also in the upper blade 40, a direction parallel to the symmetry axis AA is defined as the front-rear direction, and a direction perpendicular to the symmetry axis AA is defined as the left-right direction.
As shown in FIG. 4, six upper blade forming portions 51, 52, and 53 that protrude in a comb shape are formed substantially in the left-right direction in front of the fulcrum pin 34 of the upper blade 40. The six upper blade forming portions 51, 52, 53 are formed symmetrically, and the same reference numerals are given to the upper blade forming portions having a symmetrical shape. Hereinafter, the two upper blade forming portions 51 located on the most central side in the left-right direction are referred to as first upper blade forming portions, and the two upper blade forming portions 52 located on the left and right sides thereof are referred to as second upper blade forming portions. The two upper blade forming portions 53 located on both the left and right sides (located on both left and right ends) are referred to as third upper blade forming portions.

  As shown in FIG. 5, sharpened upper blade tips 61 and 62 are formed on the side of the first upper blade forming portion 51. Similarly, upper blade tips 63, 64, 65, 66 that are sharply processed are formed on the side portions of the second upper blade forming portion 52 and the third upper blade forming portion 53, and the upper blade 40 has a comb shape. A total of 12 upper blade edges 61, 62, 63, 64, 65, 66 are formed. The twelve upper blade tips 61-66 are formed symmetrically, and the same reference numerals are given to the upper blade tips having a symmetrical shape in the drawing. Hereinafter, the two upper cutting edges 61 located on the most central side in the left-right direction are referred to as first upper cutting edges, and the two upper cutting edges 62 located on the left and right sides thereof are referred to as second upper cutting edges, on the left and right sides. The two upper cutting edges 63 positioned are referred to as the third upper cutting edge, the two upper cutting edges 64 positioned on the left and right sides thereof are referred to as the fourth upper cutting edge, and the two upper cutting edges 65 positioned on the left and right sides thereof are referred to as the first. 5 upper cutting edges, and the two upper cutting edges 66 located on the left and right sides thereof are referred to as sixth upper cutting edges.

  As shown in FIG. 6, the first upper blade forming portion 51 is curved toward the lower blade 70 from the base B toward the tip. Further, as shown in FIG. 7, the second upper blade forming portion 52 is curved toward the lower blade 70 from the base B toward the tip. Further, as shown in FIG. 8, the third upper blade forming portion 53 is curved toward the lower blade 70 from the base B toward the tip. The curvature radius R1 of the first upper blade formation portion 51, the curvature radius R2 of the second upper blade formation portion 52, and the curvature radius R3 of the third upper blade formation portion 53 can be individually determined based on experiments or the like. In the lawn hair clipper 10 of the present embodiment, the magnitude relationship of the curvature radius R1> the curvature radius R2> the curvature radius R3 is adjusted based on the experimental results described in the later stage. That is, the radius of curvature R1 of the first upper blade forming portion 51 located on the most central side in the left-right direction is the largest, and the radius of curvature R3 of the third upper blade forming portion 53 located on both ends in the left-right direction is the smallest. The radius of curvature is smaller as the position is located at. Specifically, the curvature radius R1 = 550 mm, the curvature radius R2 = 450 mm, and the curvature radius R3 = 270 mm. Here, the length of the first upper blade forming portion 51 (distance from the base B to the tip) is about 50 mm, the length of the second upper blade forming portion 52 is about 45 mm, and the third upper blade forming portion. The length of 53 is approximately 35 mm.

Next, the configuration of the lower blade 70 will be described with reference to FIGS. 9 and 10. FIG. 9 shows only the lower blade 70 alone. FIG. 10 shows an end view taken along line XX in FIG. As shown in FIG. 9, the lower blade 70 has a mirror-symmetric shape with the straight line AA as the axis of symmetry. Hereinafter, also in the lower blade 70, a direction parallel to the symmetry axis AA is defined as the front-rear direction, and a direction perpendicular to the symmetry axis AA is defined as the left-right direction.
As shown in FIG. 9, seven lower blade forming portions 81, 82, 83, and 84 that protrude in a comb shape are formed substantially along the left-right direction at the front portion of the fulcrum pin 34 of the lower blade 70. Yes. The seven lower blade forming portions 81, 82, 83, 84 are formed symmetrically, and the same reference numerals are given to the lower blade forming portions having a symmetrical shape. Hereinafter, one lower blade forming portion 81 located on the most central side in the left-right direction is referred to as a first lower blade forming portion, and two lower blade forming portions 82 located on the left and right sides thereof are referred to as second lower blade forming portions. The two lower blade forming portions 83 located on both the left and right sides are referred to as a third lower blade forming portion, and the two lower blade forming portions 84 located on both the left and right sides (located on both the left and right ends) are 4 This is called the lower blade forming part.

Similar to the upper blade forming portions 51, 52, and 53 of the upper blade, the side portions of the lower blade forming portions 81, 82, 83, and 84 are sharpened cutting edges. A total of 12 lower cutting edges 91, 92, 93, 94, 95, 96 are formed in a line. The twelve lower cutting edges 91-96 are formed symmetrically, and in the drawing, the same reference numerals are given to the lower cutting edges having a symmetrical shape. Hereinafter, the two lower cutting edges 91 located on the most central side in the left-right direction are referred to as first lower cutting edges, and the two lower cutting edges 92 located on the left and right sides thereof are referred to as second lower cutting edges, on the left and right sides. The two lower cutting edges 93 positioned are referred to as the third lower cutting edge, the two lower cutting edges 94 positioned on the left and right sides thereof are referred to as the fourth lower cutting edge, and the two lower cutting edges 95 positioned on the left and right sides thereof are referred to as the second lower cutting edge 95. 5 lower cutting edges, and the two lower cutting edges 96 located on the left and right sides thereof are referred to as sixth lower cutting edges.
As shown in FIG. 10, the lower blade 70 is curved concavely with respect to the upper blade 40. More specifically, the lower blade 70 is curved into a cylindrical surface along the left-right direction (the direction in which the lower blade forming portions 81-84 are arranged). A suitable value for the radius of curvature R4 of the lower blade 70 can be obtained by experiments or the like. In the lawn clipper 10 of the present embodiment, the radius of curvature R4 = 2500 mm based on the experimental results described later. Here, the entire width of the lower blade 70 in the left-right direction is approximately 160 mm.

  As shown in FIG. 3, twelve upper cutting edges 61-66 formed on the upper blade 40 and twelve lower cutting edges 91-96 formed on the lower blade 70 constitute twelve cutting edge pairs facing each other. ing. When the upper blade 40 and the lower blade 70 perform a relative reciprocating angular movement, each pair of cutting edges is repeatedly opened and closed, and the plant is repeatedly cut by each pair of cutting edges. At this time, in order to cut more plants with each pair of cutting edges, each pair of cutting edges needs to be in contact with a sufficient contact pressure.

In the lawn hair clipper 10 of this embodiment, the upper blade forming portions 51, 52, 53 of the upper blade 40 are curved toward the lower blade 70 from the base B toward the tip. When the upper blade forming portions 51, 52, 53 of the upper blade 40 are curved as described above, the contact pressure of the pair of blade tips formed in the pair of blades 40, 70 can be significantly increased. However, the amount of change that occurs in the contact pressure of the pair of blade tips with respect to the amount of bending applied to the upper blade forming portions 51, 52, and 53 varies depending on the position and shape of the upper blade forming portions 51, 52, and 53. Therefore, if the curvature radii R1, R2, and R3 of the respective upper blade forming portions 51, 52, and 53 are set to the same value, the blade edge and the blade edge come into contact with each other with sufficient pressure in some blade edge pairs. In some blade edge pairs, the blade edge and the blade edge may contact with insufficient pressure. In the grass clipper 10 of the present embodiment, the radii of curvature R1, R2, and R3 of the upper blade forming portions 51, 52, and 53 are individually set based on experiments to be described later, and the pair of blades 40 and 70 are configured. All the blade edge pairs that have been made are adjusted so as to contact with a sufficient contact pressure.
Further, when the upper blade 40 is bent as described above, the contact pressure of the pair of blade tips formed on the pair of blades 40 and 70 is effectively obtained by bending the lower blade 70 into a cylindrical surface as described above. Can be adjusted. In the lawn hair clipper 10 of the present embodiment, the radius of curvature R4 of the lower blade 70 is set based on an experiment described later, and the contact pressure of the pair of blade tips formed in the pair of blades 40 and 70 is sufficiently increased. .

  Hereinafter, an experiment conducted for obtaining the optimum values of the curvature radii R1, R2, R3, and R4 will be described. In this experiment, six types of upper blades 40 shown in the table of FIG. 11 and four types of lower blades 70 shown in the table of FIG. 12 were prepared. In the table of FIG. 11, for the sample A of the upper blade 40, for example, the curvature radius R1 of the first upper blade formation portion 51 is 1500 mm, the curvature radius R2 of the second upper blade formation portion 52 is 1200 mm, and the third upper It shows that the radius of curvature R3 of the blade forming portion 53 is 750 mm. A sample Z shown in FIG. 11 is a known upper blade 40 prepared for a comparative experiment, and its entire surface is curved into a spherical shape with a curvature radius of 2500 mm. Similarly, the table of FIG. 12 shows that the curvature radius R4 of the cylindrical shape of the sample I of the lower blade 70 is 1250 mm, for example. A sample X shown in FIG. 12 is a known lower blade 70 prepared for a comparative experiment, and the entire surface thereof is planar.

  Next, the blade assembly 30 was assembled using the prepared samples of the upper blade 40 and the lower blade 70, and the contact pressures of the first blade edge pair, the third blade edge pair, and the fifth blade edge pair were measured with pressure sensitive paper. Here, the first cutting edge pair is a cutting edge pair consisting of a first upper cutting edge 61 and a first lower cutting edge 91, and the third cutting edge pair is a cutting edge pair consisting of a third upper cutting edge 63 and a third lower cutting edge 93, The five cutting edge pair is a cutting edge pair composed of a fifth upper cutting edge 65 and a fifth lower cutting edge 95. The result is shown in FIG. The column “condition” shown in the table of FIG. 13 indicates a combination of samples of the upper blade 40 and the lower blade 70. For example, the condition A + I means a combination of the sample A of the upper blade 40 and the sample I of the lower blade 70. In the case of the combination of conditions A + I, for example, it can be read that the average contact pressure of the first cutting edge pair 61, 91 was 0.9 MPa, and the maximum contact pressure was 2.3 MPa.

  From the measurement results shown in FIG. 13, it was found that the shape of sample C is preferable for the upper blade 40, and the shape of sample II or sample III is preferable for the lower blade 70. With the combination of these shapes, the contact pressure of all the blade tip pairs formed in the pair of blades 40 and 70 can be sufficiently increased. Note that the measurement results shown in FIG. 13 largely depend on the shapes of the upper blade 40 and the lower blade 70 of this embodiment, and differently measured results may be obtained with blade assemblies of other shapes. However, from the measurement results shown in FIG. 13, the curvature radius R1 of the first upper blade formation portion 51, the curvature radius R2 of the second upper blade formation portion 52, the curvature radius R3 of the third upper blade formation portion 53, and the lower blade 70 It was confirmed that the contact pressure of the pair of cutting edges can be variously adjusted by the curvature radius R4. Therefore, it is considered that the contact pressures of all the blade tip pairs can be sufficiently increased by appropriately setting these radii of curvature R1, R2, R3, and R4 even in blade assemblies having other shapes.

As mentioned above, although embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, in the gardening clipper 10 of the above-described embodiment, the configurations of the upper blade 40 and the lower blade 70 described above can be interchanged.
For example, in the gardening clipper 10 of the above-described embodiment, the lower blade 70 does not necessarily have to be curved, and a flat lower blade 70 may be employed. Further, when the lower blade 70 is curved, it is not always necessary to bend into a cylindrical surface, and it is possible to bend into a spherical shape. The shape of the lower blade 70 can be appropriately changed according to the shape of the upper blade 40.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology illustrated in this specification or the drawings achieves a plurality of objects at the same time, and achieving one of the objects itself has technical utility.

Side sectional view of a lawn hair clipper. Bottom view of lawn hair clipper. The figure which shows a blade assembly. The figure which shows an upper blade. The VV line end view of FIG. The VI-VI line end view of FIG. The VII-VII line end view of FIG. VIII-VIII line end view of FIG. The figure which shows a lower blade. XX line end view of FIG. The figure which shows the sample shape of an upper blade. The figure which shows the sample shape of a lower blade. The figure which shows the result of having measured the contact pressure of a pair of blade tips.

Explanation of symbols

10: Lawn hair clipper 12: Body 14: Housing 18: Motor 20: Gear group 22: First eccentric cam 24: Second eccentric cam 30: Blade assembly 32: Mounting plate 40: Upper blades 51, 52, 53: Upper blade formation Portion 61-66: Upper blade edge 70: Lower blade 81-84: Lower blade forming portion 91-96: Lower blade edge

Claims (4)

The body,
A pair of blades provided on the main body and at least one of which is swingably supported;
A power mechanism that is built in the main body and relatively reciprocally moves a pair of blades,
Each blade is formed in a comb shape with a plurality of blade forming portions having blade edges on the sides thereof,
The one in the pair of blades, each of the plurality of blades forming portion with curved at a predetermined radius of curvature on the other blade side base portion or al destination Tanma, the cutting edge portion positioned closest to the center side The radius of curvature of the blade forming portion located at both ends is smaller than the radius of curvature, and the radius of curvature of the blade forming portion located at both ends is smaller .
The gardening hair clipper , wherein the other of the pair of blades is curved in a concave shape with respect to one of the pair of blades . The gardening hair clipper according to claim 1 , wherein the other of the pair of blades is curved in a cylindrical shape along a direction in which the plurality of blade forming portions are arranged in a comb shape. A blade assembly used for a gardening hair clipper,
A pair of blades supported so as to be swingable with respect to each other,
Each blade is formed in a comb shape with a plurality of blade forming portions with blade edges formed on the sides thereof,
Ends on one blade, with each of the plurality of cutting edge portion is curved at a predetermined radius of curvature on the other blade side to the base portion or al the tip, than the radius of curvature of the cutting edge portion positioned closest to the center side The radius of curvature of the blade forming part located at the smaller is smaller, and the radius of curvature of the blade forming part located at both ends is smaller,
The blade assembly is characterized in that the other blade is curved in a concave shape with respect to the one blade. The blade assembly according to claim 3, wherein the other blade is curved in a cylindrical surface shape along a direction in which the plurality of blade forming portions are arranged in a comb shape.

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