JP6257954B2 - Lawn clippers - Google Patents

Description

  The present invention relates to a lawn hair clipper that cuts grass.

  Patent Document 1 discloses a lawn hair clipper that cuts grass. This lawn hair clipper includes an electric motor provided inside the housing, and a pair of upper and lower trimming blades that project forward from the lower part of the housing and reciprocate in the left-right direction via the crank mechanism by the operation of the electric motor. ing. When the electric motor is operated, the pair of upper and lower trimming blades reciprocate in the left-right direction, and the grass growing on the ground can be trimmed by the reciprocating mowing blades.

  In this lawn hair clipper, a guard plate protruding slightly forward from the cutting blade is provided at the front part of the housing, and the cutting blade comes into contact with the structure when cutting the lawn near the structure called cutting. I try to prevent it.

JP 2012-135256 A

  However, in the lawn hair clipper of the above-mentioned Patent Document 1, the guard plate is provided directly above the cutting blade (the guard plate is about 10 mm to 20 mm above the cutting blade), so that the grass cut by the cutting blade is the guard plate. Clogged with the cutting blade, and sometimes the grass could not be cut. In this case, the mowing operation was stopped and the grass between the guard plate and the mowing blade had to be removed. In addition, when a transparent plate material is used for the guard plate, the cutting blade can be seen from the upper side of the guard plate. However, if the cut grass or soil adheres to the lower surface of the guard plate, the cutting blade can be seen from the upper side of the guard plate. May not be visible. The present invention prevents the cutting blade from clogging between the guard plate and the cutting blade that prevents the cutting blade from contacting a structure such as a building, and improves the visibility of the cutting blade from the guard plate. With the goal.

In order to solve the above-described problems, the present invention provides a prime mover provided inside a housing and a forward projecting portion provided at a lower portion of the housing, and reciprocally moves in the left-right direction relatively via a crank mechanism by the actuation of the prime mover. A lawn hair clipper provided with a pair of upper and lower cutting blades and a guard plate that projects forward from the cutting blade at the front of the housing and covers the upper side of the cutting blade, the guard plate from the upper surface of the cutting blade A lawn hair clipper is provided, which is provided at a height of 30 mm or more, and an opening for visually recognizing the front part of the cutting blade is provided at the front part of the guard plate .

In grass clipper configured as described above, since the guard plate was set vignetting 30mm or more height than the upper surface of the trimming blade, grass reaped by trimming blade is hardly clogged between the guard plate and the trimmed edge Become. Thereby, in order to remove the turf clogged between the guard plate and the cutting blade, there is no need to stop the turf cutting operation. In addition, an opening for visually recognizing the front part of the cutting blade is provided in the front part of the guard plate, so that the cutting blade can be visually recognized from the upper side of the guard plate, improving workability when performing the cutting operation. To do.

In the lawn hair clipper configured as described above, the guard plate is preferably a transparent member. When doing so, the tip of the cutting blade can be visually recognized from the upper side of the guard plate, and the cutting operation is performed. Workability is improved. In addition, when the guard plate is a transparent member, there is a risk that the cut grass or soil may adhere to the lower surface of the guard plate and the tip of the cutting blade may not be visible. The part can be visually recognized, and the workability when performing the trimming work is improved.

In grass clipper configured as described above, is provided in parallel to the guard plate relative to the trimming blade it is preferred.

  In the lawn hair clipper configured as described above, the guard plate is rotatable between a horizontal position covering the upper side of the cutting blade at the front portion of the housing and a retreat position where the front end side is rotated upward. In this way, when the guard plate is unnecessary, it is only necessary to rotate it to the retracted position, and the lawn clipper is easy to use.

It is a perspective view of one Embodiment of the lawn hair clipper of this invention. It is a side view of FIG. FIG. 3 is a longitudinal cross-sectional view along the front-rear direction of FIG. 2. It is a side view of the modification of a lawn hair clipper.

  Hereinafter, an embodiment of a lawn hair clipper of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 to 3, the lawn hair clipper 10 includes a housing 11 that is integrally provided with a grip 12 held by an operator at the rear. The lawn hair clipper 10 is provided with an electric motor (prime mover) 21 provided upright inside the housing 11, and protrudes forward at the lower part of the housing 11, and is paired up and down via a crank mechanism provided at the lower part of the housing 11. The cutting blades 31 and 32 are provided.

  As shown in FIG. 3, the output shaft 21 a of the electric motor 21 is provided with a pinion gear 22, and the pinion gear 22 is rotatably supported by a support shaft 23 provided in the housing 11. Are engaged. A second intermediate gear 25 having a smaller diameter is integrally provided at a lower portion of the first intermediate gear 24, and the second intermediate gear 25 is rotatably supported on the support shaft 23 together with the first intermediate gear 24. ing. The second intermediate gear 25 is engaged with a drive gear 27 fixed to a support shaft 26 provided at a lower portion in the housing 11. A crank cam 28 constituting a crank mechanism is fixed to the lower surface side of the drive gear 27 by two pins, and power is transmitted from the drive gear 27 to the crank cam 28. The crank cam 28 includes a pair of upper and lower disks 28a and 28b arranged eccentrically with respect to the support shaft 26. The centers of both discs 28a, 28b of the crank cam 28 are positioned opposite to each other with the support shaft 26 therebetween, that is, a phase difference of 180 °.

  As shown in FIG. 1 to FIG. 3, a pair of upper and lower trimming blades 31, 32 are provided on the lower portion of the housing 11 so as to protrude forward, and the trimming blades 31, 32 are laterally moved at the lower portion of the housing 11. It is supported movably. The cutting blades 31, 32 have a wide shape in which the front portion extending forward from the rear portion attached to the lower portion of the housing 11 is longer in the left-right direction than the width of the housing 11. Toothed blade portions 31a and 32a are formed. In addition, engagement holes 31b and 32b having a rounded rectangular shape that is long in the front-rear direction are formed at the rear portions of the cutting blades 31 and 32. The discs 28a and 28b of the crank cam 28 are engaged with the engaging holes 31b and 32b of the trimming blades 31 and 32 so as to be slidable in the longitudinal direction.

  When the drive gear 27 is rotated by driving the electric motor 21, the disks 28 a and 28 b of the crank cam 28 revolve around the support shaft 26. As each disk 28a, 28b slides and moves in the longitudinal direction in the engagement holes 31b, 32b of the respective cutting blades 31, 32, the respective cutting blades 31, 32 reciprocate in the left-right direction. At this time, the discs 28a and 28b of the crank cam 28 are arranged at a phase difference of 180 ° with respect to the support shaft 26, so that the cutting blades 31 and 32 reciprocate in opposite directions in the left-right direction.

  As shown in FIGS. 1 and 2, the front portion of the housing 11 is provided with a guard plate 40 that covers the upper side of the trimming blades 31 and 32, and the support arm portion that extends rearward from the rear portion of the guard plate 40. 41 and 41 are detachably engaged with the side portion of the housing 11. The guard plate 40 is made of a transparent hard resin member such as acrylic resin or polyvinyl chloride resin. The guard plate 40 has a length slightly longer than the width of the cutting blades 31 and 32 and protrudes slightly forward from the front ends of the cutting blades 31 and 32. The guard plate 40 is provided at a position where the height h from the upper cutting blade 31 is 50 mm. In this embodiment, the height h from the trimming blade 31 on the upper side of the guard plate 40 is 50 mm. However, the height h is not limited to this, and the height h is 30 mm or more, and further 60 mm or less. preferable. A pair of left and right openings 42, 42 are formed in the front part of the guard plate 40, and the openings 42, 42 are for visually recognizing the front parts of the cutting blades 31, 32 from above.

  The lawn hair clipper 10 includes a height adjustment mechanism 50 that adjusts the height of the lawn mowing by changing the height position of the cutting blades 31 and 32 with respect to the ground. The height adjustment mechanism 50 includes a slider 51 that slides along the ground at the bottom of the housing 11. The slider 51 is supported by a support block 13 provided at the rear end portion of the bottom portion of the housing 11 so as to be rotatable around a horizontal axis perpendicular to the front-rear direction, and by changing the vertical position of the front portion of the slider 51 with respect to the housing 11, The height position of the cutting blades 31 and 32 with respect to the ground can be changed. With this height adjustment mechanism 50, the height of the cutting blades 31, 32 can be adjusted to a height of 15 mm, 20 mm, or 25 mm from the ground. A receiver portion 52 that receives the grass cut by the cutting blades 31 and 32 is formed on the side of the slider 51.

  The operation of the lawn hair clipper 10 configured as described above will be described. In the lawn clipper 10, when the electric motor 21 is operated, the first intermediate gear 24 engaged with the pinion gear 22 of the output shaft 21 a rotates and engages with the second intermediate gear 25 that rotates together with the first intermediate gear 24. The drive gear 27 thus rotated rotates. The rotation of the drive gear 27 is transmitted to the crank cam 28 fixed by two pins, and each disk 28a, 28b of the crank cam 28 rotates eccentrically with respect to one support shaft 26. The discs 28a and 28b of the crank cam 28 slide and move through the engagement holes 31b and 32b of the cutting blades 31 and 32 while rotating eccentrically with respect to the support shaft 26 with a phase difference of 180 °. 31 and 32 reciprocate in the left-right direction in opposite directions.

  When the operator grips the grip 12 of the housing 11 and slides the slider 51 provided on the bottom of the housing 11 along the ground on which the grass grows, the cutting blades 31 and 32 that reciprocate relatively in the left-right direction. The grass is cut by the blade portions 31a and 32b. Further, since the guard plate 40 slightly protruding forward from the cutting blades 31 and 32 is provided above the cutting blades 31 and 32, when cutting the lawn near the structure called cutting, the cutting blades 31, 32 can prevent the blade portions 31a and 32b from being damaged due to contact with the structure.

  In the lawn hair clipper 10 configured as described above, the guard plate 40 is provided at a height of 50 mm with a height h from the upper surface of the cutting blade 31 being 30 mm or more. When the guard plate 40 is 30 mm or more from the upper surface of the cutting blade 31, the operator can perform lawn mowing work with peace of mind because the guard plate 40 is on the upper side so as not to be too far from the cutting blade 31. The grass cut by the blades 31 and 32 is less likely to be clogged between the guard plate 40 and the cutting blade 31, and the grass cutting operation is stopped to remove the clogged grass between the guard plate 40 and the cutting blade 31. No longer needed.

  Further, since the guard plate 40 is made of a transparent hard resin member, the cutting blades 31 and 32 can be visually recognized from the upper side of the guard plate 40, and the workability when performing the cutting operation is improved. Furthermore, an opening 42 for visually recognizing the front portions of the cutting blades 31 and 32 is provided in the front portion of the guard plate 40. Thereby, the front-end | tip part of the cutting blades 31 and 32 can be visually recognized from the upper side of the guard board 40, and workability | operativity when performing a cutting operation improves. In particular, when the guard plate 40 is a transparent member, there is a possibility that the cut grass, soil, or the like adheres to the lower surface of the guard plate 40 and the tips of the cutting blades 31 and 32 cannot be visually recognized. Therefore, the tips of the cutting blades 31 and 32 can be visually confirmed, and the workability when performing the cutting operation is improved.

  In the grass clipper 10 configured as described above, the guard plate 40 is detachably attached to the front portion of the housing. However, the present invention is not limited to this, and as shown in FIG. Can be freely rotated between a horizontal position covering the upper side of the cutting blades 31 and 32 at the front portion of the housing 11 and a retracted position (indicated by a two-dot chain line) where the front end side is rotated upward. Good. In this way, when the guard plate 40 is not necessary, such as when not cutting, the grass clipper 10 can be easily used by simply rotating it to the retracted position.

  In the lawn hair clipper 10 configured as described above, the electric motor 21 is used as the prime mover. However, the present invention is not limited to this, and the same function and effect can be obtained even when a small engine is used. Can be obtained.

  Moreover, in the above-mentioned embodiment, although both the cutting blades 31 and 32 reciprocated in the opposite directions by the crank mechanism, the one cutting blade was fixed without reciprocating, and the other cutting blade was fixed. It may be a one-blade driven lawn hair clipper in which the cutting blade relatively reciprocates by being reciprocated by a crank mechanism.

 DESCRIPTION OF SYMBOLS 10 ... Lawn hair clipper, 11 ... Housing, 21 ... Motor | power_engine (electric motor), 31, 32 ... Cutting blade, 40 ... Guard plate, 42 ... Opening part.

Claims (4)

A prime mover provided inside the housing;
A pair of upper and lower trimming blades protruding forward at the lower part of the housing and reciprocating relatively in the left-right direction via a crank mechanism by operation of the prime mover;
A lawn hair clipper provided with a guard plate covering the upper side of the cutting blade, which is provided to protrude forward from the cutting blade at the front portion of the housing;
The guard plate is provided at a height position of 30 mm or more from the upper surface of the cutting blade ,
A lawn hair clipper provided with an opening for visually recognizing a front portion of the cutting blade at a front portion of the guard plate . The lawn hair clipper according to claim 1,
The lawn hair clipper, wherein the guard plate is made of a transparent member. In the lawn hair clipper according to claim 1 or 2 ,
A lawn hair clipper, wherein the guard plate is provided in parallel to the cutting blade. In the lawn hair clipper according to any one of claims 1 to 3 ,
The lawn clipper is characterized in that the guard plate is rotatable between a horizontal position covering the upper side of the cutting blade at the front portion of the housing and a retracted position where the front end side is rotated upward.

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