JPH0212826Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a cutting cord type mower configured to cut grass by centrifugally rotating a flexible cutting cord.

Prior Art Conventional techniques include, for example, Japanese Patent Publication No. 51-28538 and Japanese Utility Model Publication No. 55-4981.

Problems to be Solved by the Invention The purpose of the invention is to solve problems in this type of lawn mower, such as the troublesome operation of pulling out the cutting cord and the uncertainty in pulling out the cutting cord. To provide a lawn mower that can simplify the drawer operation and facilitate the drawer of cutting cords.

Means for Solving the Problems The present invention is based on the present invention, in which the mower is provided with protrusions on the upper surface of the bottom plate of the case, which is rotatably supported in the head of the mower, at equal positions in the circumferential direction of the upper surface. A suitable number of lower ratchets and recessed accommodating portions are formed adjacent to each of the lower ratchets, and the housing is inserted into the case for winding cutting cord for mowing grass. The lower end surface of the spool is elastically displaced upwardly and is rotatably supported. Upper ratchets are formed at equal positions in the circumferential direction so as to be protruding from each other so as to be able to engage and engage synchronously with the lower ratchets, and are each provided with inclined guide surfaces that are inclined in the rotational direction of the case. The upper end surface of the cap is fitted to the center of the bottom plate so that it can be grounded and elastically displaced toward the spool. In order to push up the guide surface so that the engagement between the upper ratchet and the lower ratchet is synchronously disengaged, a pushing piece is fitted into each of the housing portions so as to be able to escape upwardly. It has a set configuration.

Function The lawn mower of the present invention has a case that rotates steadily and a spool that is rotatably supported within the case, and a cap that is fitted into the center of the bottom plate of the case so that it can be grounded and displaced toward the spool. The spool is configured to be connected or disengaged by controlling the operation of the spool, and to switch between the turning operation and the pulling-out operation of the cutting cord wound around the spool, and to push the spool in the direction of pulling out the cutting cord when the pulling out of the cutting cord is started. This is what I did.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a head of a lawn mower k, which includes a motor housing 1a containing a motor,
A cover 1b that covers a storage mechanism s for drawably and controllably storing a flexible cutting cord c made of plastic material or the like is disposed vertically, and the outer circumferential surface of the cover 1b is provided with a cutting cord. A cutter 2 for cutting the string c to a predetermined length is attached, and a support rod 3, a battery case 5 containing a battery 4, and a grip 6 are connected above the head 1.

Next, to explain the storage mechanism s, 7
The case is fitted onto a drive shaft 8 protruding from inside the cover 1b and rotatably supported inside the head 1. The case is shaped like a hollow cylindrical table and can be divided into upper and lower halves. A shaft portion 9 protrudes from the center of the casing 7a, while an insertion hole 1 is provided at the right end of the side wall 7b for inserting the cutting cord c and pulling it out of the case 7.
Further, on the upper surface of the bottom plate 7c, which has a fitting hole 11 opened in the center, an appropriate number of lower ratchets 12 are provided, each having a substantially serrated shape and protruding at equal positions in the circumferential direction. ~12 and each lower ratchet 1
Recessed accommodating portions 13 to 13 are respectively formed adjacent to the locking surfaces 12a that are formed perpendicularly to the side surfaces in the rotational direction of 2, and are arranged rotationally symmetrically at 90 degrees with respect to the circumferential direction. has been done.

Reference numeral 14 denotes a flanged spool which is inserted into the case 7 for winding the cutting cord c and is pivotally supported so as to be vertically displaceable and rotatable via the shaft portion 9, and has a shaft hole 14a. The step at the bottom and case 7
The upper spring 15 is always biased downward by the upper spring 15 which is interposed between the shaft portion 9 of
4 to the case 7 for co-rotation, the guide surfaces are provided at equal positions in the circumferential direction so as to be able to be synchronously engaged with and engaged with the lower ratchets 12, and are inclined in the direction of rotation of the case 7. Approximately serrated upper latches 16 to 16 with inclined serrations 16a are formed and arranged in the circumferential direction, and each of the upper latches 16 is always engaged with each of the lower latches 12 by the elastic force of the upper spring 15. The spool 14 is connected to the case 7 so as to be able to rotate together with the case 7, and the cutting cord c rotates together with the case 7 and centrifugally rotates.

Reference numeral 17 denotes a substantially bottomed cylindrical cap that is fitted into the fitting hole 11 of the case 7 so as to be vertically displaceable but not rotatable, and whose lower end protrudes downward from the case so as to be able to touch the ground. , always this cap 17
The cap 17 is biased downward by a lower spring 18 that is fitted inside the cap and is interposed between the cap and the spool 14, and when the cap 17 is in contact with the ground on the upper end surface and is displaced toward the spool 14, each of the upper ratchets 16 Information surface 16
each upper ratchet 16 in contact with a,
In order to disengage the upper and lower ratchets 16 and 12 and push up the spool 14 and the case 7 so that the connection between the spool 14 and the case 7 is disengaged, the upper ratchets 16 and 12 are arranged so as to be able to move in and out of synchronization with each other in the circumferential direction. Pushing pieces 19 to 19 are provided in a protruding manner, and the outer vicinity of each pushing piece 19 is fitted into each housing portion 13 of the case 7 so as to be able to escape upwardly, so that the cap 17 is displaced upwardly. At times, each pushing piece 19 escapes from the housing portion 13 and is displaced above the lower ratchet 12.

Next, the operation and effects of the embodiment having the above configuration will be explained.

First, when mowing the grass, hold the head 1 slightly above the ground and rotate the case 7.
Since the cap 17 is held at the lower end position and each pushing piece 19 is held below each lower ratchet 12 (see FIG. 1), each upper and lower ratchet 16,
12 mesh with each other, the spool 14 and the cutting cord c rotate together with the case 7, and mowing work can be performed by the centrifugal turning operation of the cutting cord c, whose withdrawal from the spool 14 is regulated by co-rotation with the case 7. .

On the other hand, when the cutting cord c is worn out and the cutting cord c is pulled out from the spool 14, the head 1 is placed on the ground and the cap 17 is brought into contact with the ground.
is displaced toward the spool 14 by the downward movement of the case 7, so each pushing piece 19 of the cap 17 pushes up the upper ratchet 16 and the upper and lower ratchets 16, 12
The engagement between the spool 14 and the case 7 is disengaged (see Fig. 2).
When each upper ratchet 16 is pushed up, the upper ratchet 16 comes into contact with the guide surface 16a of the upper ratchet 16, and the guide surface 1
6a is pushed up until the upper and lower ratchets 16 and 12 are disengaged, and the upper ratchet 16 is pushed up while slidingly contacting the guide surface 16a, so that the spool 14 is disengaged from the case 7, and the spool 14 is disconnected from the case 7. The string c is rotated slightly in the direction in which it is pulled out (see Figure 6A). Then, the spool 14 temporarily rotates idly until the pushing piece 19 detached from the upper ratchet 16 locks the upper ratchet 16 arranged adjacent to the upper ratchet 16, and then moves again via the pushing piece 19. As a result of being connected to the cap 17 and the case 7 (see Fig. 6B), the spool 14 idles in an inching manner by an angle corresponding to the arrangement interval of each upper ratchet 16, and then rotates together with the case 7 again to start mowing. The string c is automatically pulled out by the above-mentioned idling angle. Also, when the cap 17 is released from the ground, the spool 14 and the cap 17
are returned to their original positions by the elastic forces of the upper and lower springs 15 and 18, and the upper and lower ratchets 16 and 12 are engaged again, and the spool 14 and the case 7 are linked so that they can rotate together, and the withdrawal of the cutting cord c is restricted. be done.

Therefore, by moving the cap 17, it is possible to easily switch between the turning operation and the pulling-out operation of the cutting cord c, which greatly simplifies the pulling-out operation of the cutting cord c and the operation of switching the operation of the cutting cord c. This has the effect of simplifying the handling of the mower.

In particular, when pulling out the cutting cord c, the pushing piece 19
slides on the guide surface 16a of the upper ratchet 16 and pushes the spool 14 in the direction of pulling out the cutting cord c, so the spool 14 has a starting force for forcibly rotating the spool 14 in the direction of pulling out the cutting cord c. As a result of the addition of , the spool 14 reliably and smoothly starts idling and the cutting cord c is accurately pulled out, and even if the centrifugal turning force of the cutting cord c is small, the pulling out of the cutting cord c is facilitated. Can be done.

Effects of the invention Since the present invention is configured as described above, it is possible to simplify the operation of pulling out the cutting cord and the switching operation between pulling out and stopping the pulling out of the cutting cord, and also has the effect of being able to pull out the cutting cord smoothly and accurately. has.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a side sectional view of the main parts when the cutting string is turned, Fig. 2 is a side sectional view of the main parts when the cutting string is being pulled out, and Fig. 3 is a side sectional view of the main parts when the cutting string is being pulled out. is an overall perspective view, FIG. 4 is an exploded side view of the main parts, FIG. 5 is an exploded perspective view of the same, and FIGS. 1...Head, 7...Case, 12...Lower ratchet, 13...Accommodating section, 14...Spool,
16... Upper ratchet, 16a... Guide surface, 1
7...Cap, 19...Pushing piece.

Claims (1)

[Scope of utility model registration request] The upper surface of the bottom plate of the case, which is rotatably supported in the head of the mower, has an appropriate number of lower latches protruding from the upper surface at equal positions in the circumferential direction, and each of these lower latches. and recessed housing portions adjacent to the case, respectively, and the case is inserted into the case for winding a cutting cord for mowing grass, and is pivotally supported for upward elastic displacement and rotation. The lower end surface of the spool is provided with lower ratchets at equal positions in the circumferential direction of the lower end surface of the spool, in order to always mesh with each of the lower ratchets and to connect the spool to the case so that the spool can rotate together with the lower end surface of the spool. An upper ratchet is formed with an inclined guide surface that protrudes to enable synchronous engagement and is inclined in the rotational direction of the case, and further includes an upper ratchet that is grounded at the center of the bottom plate of the case and elastically displaced toward the spool. The upper end surface of the cap, which can be fitted into the cap, is configured such that when the cap is displaced toward the spool, the guide surface is displaced upwardly from the lower ratchet to connect the guide surface to the upper ratchet and the lower ratchet. A mowing machine characterized in that a pushing piece is fitted in each of the housing parts so as to be able to escape upwardly so as to push up each so that the meshes of the mowers are synchronously disengaged.