JP2014068597A - Pruning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pruning machine as a grass clipper with a blade for pruning grass at the bottom part of the main body, in which machine: the blade is detachably attached on the main body so as to be detached from the main body upon maintenance, such as exchanging the blade; and a blade cover is prevented from deformation so as to make the blade to be hardly disengaged on cam, resulting in excellent operability.SOLUTION: In order to hold the detachable blade 3, an axis part 12a as an attachment onto the main body is arranged on either side of blade cover 12, a hook 16 capable of moving back and forth by virtue of rotation type operating elements is arranged on the other side, and the blade 3 which is attached onto the main body of the tool by hooking the hook 16 on the outer frame of the main body is fixed. The operating elements are: arranged at right and left sides of the blade cover 12; held with a shaft; and arranged in a direction orthogonal to the moving direction of the hook 16.

Description

  The present invention relates to a trimming machine used for trimming grass or the like.

  This type of trimming machine is equipped with a blade at the bottom of the main body and converts the rotation of the motor built in the main body into a horizontal swinging motion of the blade by an eccentric cam to perform trimming work such as lawn. Is provided with a blade cover that covers a part of the blade. The blade cover is detachably attached to the main body so that the blade can be removed from the main body during maintenance such as replacement of the blade.

  In a trimming machine provided with a slidable blade cover that covers a blade and a part of the blade at the bottom of the main body, a locking recess and a groove continuous to the locking recess are formed at the bottom of the main body, and a latch portion is provided at one end in the sliding direction of the blade cover. A shaft portion is formed, the latch portion is engaged with the locking recess on the main body side, and the shaft portion is engaged with the groove portion on the main body side.

  Engagement portions that selectively engage with engagement protrusions formed on the main body to fix the blade cover to the main body are formed on the left and right ends of the blade cover.

  Until the blade cover slides relative to the main body and the shaft portion on the blade cover side passes through the convex portion of the groove portion on the main body side, the engaging convex portion on the main body side and the engaging portion on the blade side are engaged with each other. When the cover is fixed to the main body and the shaft portion on the blade cover side passes through the convex portion of the groove portion on the main body side and engages with the flat portion, the engagement convex portion on the main body side and the engaging portion on the blade cover side When the blade cover is removed from the main body for maintenance such as replacement (not shown), the blade cover's projecting piece is After releasing the engagement with the locking recess, slide the blade cover to release the engagement between the engagement portion on the blade cover side and the engagement protrusion on the main body side, and then the blade cover is removed from the main body. Can do.

JP 2008-173047 A

  However, in this sliding method, since the blade is held at both ends of the blade cover, the central portion is easily deformed. Therefore, it is difficult to apply pressure to the central portion, and the blade bites a hard object such as a stone. The blade may be deformed and the blade may come off the rotationally driven cam.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a trimming machine with good operability that prevents the blade from being detached from the cam by preventing deformation of the blade cover.

  In order to achieve the above object, the invention according to claim 1 is a trimming machine including a blade cover that covers a base end portion of a blade disposed at the bottom of the main body, the main body bottom including a blade cover mounting portion, The blade cover includes a blade cover body that covers the base end portion of the blade, an attachment portion that is formed on one end side of the blade cover body and is rotatably attached to the blade cover attachment portion, and the blade And a hook that is movably disposed on the other end side of the cover main body and engageable with the locking portion.

  According to a second aspect of the present invention, in the first aspect of the invention, the blade cover includes a moving means for moving the hook, an operating means provided on the moving means for operating the moving means, and an urging force for urging the hook. And engaging / disengaging the hook and the engaging portion by operating the operating means.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a pair of operating means are provided on opposite side surfaces of the blade cover, and the operating means can be integrally rotated by a shaft. .

  The invention according to claim 4 is the invention according to claim 3, wherein the moving means is constituted by an eccentric cam, and the hook is moved by the rotation of the eccentric cam.

  According to the first aspect of the present invention, the blade cover mounting portion and the locking portion are provided at the bottom of the main body, the blade cover is covered with the blade cover main body that covers the base end portion of the blade, and one end side of the blade cover main body. A mounting part that is formed and pivotably attached to the blade cover mounting part, and a hook that is movably disposed on the other end side of the blade cover body and engageable with the locking part is provided, and the blade cover can be attached to and detached from the bottom of the body By doing so, the operability of attaching and detaching the blade cover can be improved and the deformation of the blade cover can be prevented.

  According to the invention described in claim 2, it is possible to know that the blade cover is securely fixed to the main body by confirming the position of the operation means.

  According to the third aspect of the invention, the blade cover can be prevented from being deformed by disposing the shaft for holding the operating means on the blade cover.

  According to invention of Claim 4, a hook can be reliably moved back and forth by a moving means, and the operativity can be improved.

It is a side view (part cross section) at the time of blade cover fixation of the trimming machine concerning the present invention. It is a top view of the blade cover which removes and shows the blade cover of the trimming machine which concerns on this invention. It is a figure of the arrow AA line direction of FIG. It is a side view at the time of the blade cover fixed release of the trimming machine concerning the present invention. It is a top view at the time of the blade cover fixed release of the trimming machine which concerns on this invention. It is a side view at the time of the blade cover fixed release of the trimming machine concerning the present invention. It is a side view of the bottom of a main part which shows the state where the blade of the conventional trimming machine removed. It is the BB sectional view taken on the line of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side sectional view of a trimming machine according to the present invention. When the right side of FIG. 1 is the front side of the main body 2 and the front side of the paper is the right side of the main body 2, the trimming machine 1 is substantially disposed at the lower front end of the main body 2. There are provided two blades 3 (upper blade 3a and lower blade 3b) in the form of a saw blade extending horizontally. Here, the main body 2 is configured by combining and integrating a resin housing divided into left and right parts by a plurality of screws. A handle portion 2a for an operator to hold is formed on the upper portion of the main body, and a switch 19 is provided on the handle portion 2a. A power cord 4 is led out from the rear portion of the main body 2, and a power plug 5 is attached to an end portion (free end) of the power cord 4.

  A motor (not shown) as a drive source is accommodated in the main body 2 so as to extend the output shaft downward from the main body. Furthermore, in the main body 2, two shafts 6 and 7 parallel to the output shaft of the motor are installed vertically, and one shaft 6 is provided with gears of large and small diameters in two stages, upper and lower. A gear 8 is supported in a rotatable and removable state, and a large-diameter gear 9 is rotatably supported on the other shaft 7.

  By the way, the gear 9 is integrally formed with a large eccentric boss 18a and a small eccentric boss 18b that are eccentric with respect to the shaft 7, and the large eccentric boss 18a and the small eccentric boss 18b are eccentric in phase. Are mutually offset by 180 °.

  On the other hand, the upper blade 3a and the lower blade 3b of the blade 3 are pivotally supported by a pin 11 erected on the plate 10 so as to be swingable. As shown in FIGS. Long base large cam holes 20a and small cam holes 20b are respectively formed at the base end portions of the upper blade 3a and the lower blade 3b. A large eccentric boss 18a of the gear 9 is fitted in a large cam hole 20a formed in the upper blade 3a. Similarly, a small eccentric boss 18b of the gear 9 is fitted into a small cam hole 20b formed in the lower blade 3b.

  Further, a blade cover 12 of the present invention covering a part of the blade 3 is attached to the attachment portion 2b at the bottom of the main body 2, and the operation means of the present invention for moving the cam 17 which is the movement means of the present invention on the side surface. A lever 13 is provided. A hook 16 that moves back and forth by a cam 17 is installed inside the blade cover 12 while receiving the elastic force of the spring 15 that is the biasing means of the present invention. The blade cover 12 is supported by the hook 16 being locked to the shaft portion 12a of the blade cover and the locking portion 2c of the main body.

  In the trimming machine 1 according to the present embodiment, the lever 13 is rotated to release the engagement between the hook 16 and the locking portion 2c on the main body 2 side, and then the blade cover shaft 12a is used as a rotating shaft. When the cover 12 is rotated, the blade cover 12 is opened, so that maintenance such as replacement can be performed by removing the blade 3 from the main body 2. Hereinafter, the engagement / disengagement structure of the blade cover 12 will be described with reference to the drawings.

  As shown in FIG. 2, a shaft 14 that connects the levers 13 a and 13 b is provided at the center in the width direction of the bottom of the main body 2. As shown in FIG. 3, a cam 17 is installed on the shaft 14.

  The shaft 14 is located at the center of the blade cover 12, whereby deformation of the blade cover 12 can be prevented and the blade 3 can be prevented from coming off from the cam 17.

  The hook 16 is formed in a U shape so as to follow the inner wall of the blade cover 12. The hook 16 is provided with springs 15 on both sides of the lever 13 a and the lever 13 b, receives elastic force from both sides of the main body, and is suppressed by being restrained by the cam 17. The configuration of the hook 16 can prevent the blade cover 12 from being deformed.

  As shown in FIG. 3, the lever 13 a and the lever 13 b are connected by a shaft 14, and movement of one side is transmitted to one side through the shaft 14, so that even when only one side is moved, the other side similarly moves. Therefore, even when only the lever 13a is moved, both the cams 17 move in the same manner, and the hook 16 moves in the longitudinal direction of the blade cover 12.

  When the blade 3 is removed from the main body 2 for maintenance such as replacement, the cam 17 is rotated by operating the lever 13a or the lever 13b as shown in FIG. 4, and as shown in FIG. The hook 16 is moved to the rear of the main body 2. Next, by releasing the engagement between the hook 16 and the locking portion 2c, the blade cover 12 can be rotated about the shaft portion 12a of the blade cover as a rotation axis. As shown in FIG. The cover 12 can be removed. When the blade cover 12 is removed from the main body 2, the blade cover 12 is supported by the shaft portion 12a of the blade cover and is not removed from the main body 2. Therefore, the blade cover 12 is not lost.

  Thereafter, when the blade 3 is removed from the main body 2, the main body 2 is usually turned upside down, that is, with the bottom face up. At this time, in the present embodiment, the blade cover 12 can be opened sufficiently and sufficiently, so that the blade 3 can be removed from the main body 2 without any trouble without being removed, and maintenance such as replacement can be performed.

Next, the operation of the trimming machine 1 having the above configuration will be described with reference to the drawings. When the switch 19 provided on the handle portion 2a of the main body 2 is turned on to start the motor, the output shaft rotates. Is decelerated through the large diameter gear and the small diameter gear of the step gear 8 and transmitted to the gear 9, and the gear 9 is rotationally driven. Then, when the large eccentric boss 18a and the small eccentric boss 18b of large and small diameters formed integrally with the gear 9 rotate, the upper blade 3a and the lower blade 3b of the blade 3 have a phase of 180 with respect to the pin 11. Since the rocking is alternately performed in the opposite direction in a state of being deviated, the lawn and the like are trimmed by the upper blade 3a and the lower blade 3b.

  At this time, the shaft 14 is arranged in the center of the blade cover 12 to prevent the blade cover 12 from being deformed and to apply pressure to the blade 3, so that the blade 3 bites a hard object such as a stone. It is possible to prevent the blade 3 from coming off even when it is stuck.

  As described above, in the present embodiment, when removing the blade 3 from the main body 2, the blade cover can be removed by rotating the lever 13a or the lever 13b and releasing the engagement between the hook 16 and the locking portion 2c. 12 can be released from the main body 2 with good operability. Then, if the blade cover 12 is rotated, the blade cover 12 is disengaged from the main body 2, so that maintenance such as replacement can be performed by removing the blade 3 from the main body 2.

  When the maintenance of the blade 3 is completed, the blade 3 is assembled into the main body 2, and then the blade cover 12 is rotated around the shaft portion 12a of the blade cover. After closing the blade cover 12, the lever 13a or the lever 13b is rotated. The blade cover 12 is fixed to the main body 2 again by moving and engaging the hook 16 with the locking portion 2c. In this way, the blade cover 12 can be engaged and disengaged with respect to the main body 2 with good operability. And since the blade cover 12 is removed from the main body 2 and is not cut off, there is no problem such as losing the blade cover 12.

  In the present embodiment, the user can easily determine whether the blade cover 12 is in the fixed state or the released state by confirming the position of the lever 13, and the operation can proceed smoothly.

  Further, since the shaft 14 is positioned at the center of the blade cover 12, it is possible to prevent the blade cover 12 from being deformed during the operation, and it is possible to suppress the blade 3 from being detached.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the present embodiment, the example of the cam has been described as an example of the moving means. In this embodiment, the lever is described as an example of the operation means. However, the present invention is not limited to this, and can be applied, for example, by a dial. Further, in the present embodiment, the example of the spring has been described as an example of the urging means. However, the present invention is not limited thereto, and for example, rubber can be applied.

DESCRIPTION OF SYMBOLS 1 Mower 2 Main body 2a Main body handle 2b Mounting portion 2c Main body locking portion 3 Blade 3a Blade upper blade 3b Blade lower blade 4 Power cord 5 Power plug 6 Shaft 7 Shaft 8 Step gear 9 Gear 10 Plate 11 Pin 12 Blade cover 12a Shaft part 13, 13a, 13b of blade cover Lever 14 Shaft 15 Spring 16 Hook 17 Cam 18a Large eccentric boss 18b Small eccentric boss 19 Switch 20a Large cam hole 20b Small cam hole 21 Hook support

Claims (4)

The body,
A motor housed in the body;
A gear for transmitting the rotational motion of the motor;
A pair of blades driven by a rotational motion transmitted to the gear;
A trimming machine provided with a blade cover arranged at the bottom of the main body so as to cover the base end of the blade,
On the bottom of the main body, a blade cover mounting portion and a locking portion are formed,
The blade cover includes a blade cover main body that covers a base end portion of the blade, an attachment portion that is formed on one end side of the blade cover main body and is rotatably attached to the blade cover attachment portion, and the blade cover main body. A hook provided on the other end side so as to be able to advance and retract, and engageable with the locking portion;
A trimming machine comprising: The blade cover includes moving means for moving the hook, operation means provided on the moving means for operating the moving means, and biasing means for biasing the hook,
2. The trimming machine according to claim 1, wherein the engagement between the hook and the locking portion is disengaged by operation of the operation means.   3. The trimming machine according to claim 2, wherein a pair of the operating means are provided on opposite side surfaces of the blade cover, and the operating means can be integrally rotated by a shaft.   3. The trimming machine according to claim 2, wherein the moving means is constituted by an eccentric cam, and the hook is moved by rotation of the eccentric cam.