JPS5925135Y2 - Lawn mower cord blade head - Google Patents

Description

[Detailed explanation of the invention] A cutting blade device for portable grass mowers has been developed that uses nylon cord instead of metal blades to maintain safety for the user and the surrounding area. A very wide variety of structures can now be found on the market.

The present invention aims to simplify these structures to provide a cord-wrapped cutting blade head that is easy to handle and relatively lightweight.

A detailed explanation will be given below using examples.

FIG. 1 shows a longitudinal section of the cutting blade head of the present embodiment, and FIG. 2 shows a bottom view of FIG. 1.

FIG. 3 shows the overall appearance of a lawn mower equipped with a cord blade head according to an embodiment of the present invention, which has an engine 2 attached to the upper end of a long rod 1.
A rotating shaft 3 inserted into a long rod 1 is driven, and a cutting blade device 4 according to the present invention is provided at the lower end of the long rod 1.

An extension shaft 3' is screwed onto the rotating shaft 3, and a spool 5 having a canopy 6 on the upper part is fixed integrally to this shaft 3'.
A lower member 15, which is vertically assembled to the lower part of the boss portion 7, is fastened to the extension shaft 3' by a nut 13.

According to FIG. 1, this lower member 15 has a pair of symmetrical supporting arms 8 projecting in the horizontal direction, and its tips are bent near the outer periphery of the spool 5 to block a part of the outer periphery of the spool 5. A bend 8' is provided, which is provided with a radially oriented through hole 9.

The through hole 9 may be formed directly in the support arm, or may be used by interposing an auxiliary member such as a flexible guide support tube.

The spool 5 has an auxiliary wall 5' on the lower side, and the cord 10
This is useful for ensuring winding.

The cord 10 is provided with a locking hole 11 in the boss portion 7 of the spool 5, and the inner end of the cord 10 is inserted and fixed therein.

The outer end of the cord 10 can extend radially through said through hole 9 to create a free end 12 outside the spool 5.

As a result of having the above structure, loosen the nut 13 and tighten the spool 5.
If the fixation of the lower member 15 is released, the lower member 15 can be freely rotated using the support arm 8 as a handhold, and the free end 12 of the cord 10, which has been worn out and shortened, can be rotated in the direction of unraveling the cord 10. The free end 12 of the cord 10 that has come out too much by rotating the cord 10 as it winds can be shortened and accommodated in the spool 5.

In order to finely adjust the rotation of the upper and lower members and to ensure their fixation, there are measures such as providing a chrysanthemum seat on the abutting surfaces of the boss portions of both the upper and lower members, which are at the discretion of the design.

Furthermore, since the outer periphery of the coat 0 on the spool 5 is exposed to the outside, it is convenient to fit a transparent band 14 made of a thin plate material around the wound outer periphery of the cord for protection.

Note that the lower member 15 of the embodiment is provided with one set of support arms 8 symmetrically, which is effective for balancing the rotating body, but in practice, the cord is used only on one side. Often.

As a member corresponding to the lower member 15 of the present invention,
As shown in Publication No. 11725, conventionally, a housing with a relatively thick peripheral wall has been used, and in order to reduce the weight, it has been considered to reduce the thickness of the housing, which tends to be costly. The lower member 15 of the present invention is made lighter and simpler by removing substantially all of the peripheral wall except for the support part of the cord.

Thus, the advantages of the cord blade head of the present invention are that the head is lighter and the tip of the long rod is lighter, making it easier to handle; the contents of the cord winding can be seen; and the lower part can be easily rotated by hand, making the cord easier to handle. There are many direct benefits to the user, such as making it easier to deal with wear and tear, and it is possible to provide a convenient practical product.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the head of the cutting blade according to the embodiment of the present invention. FIG. 2 is a bottom view of FIG. 1; FIG. 3 is an overall view of a lawn mower equipped with a cord blade head according to an embodiment of the present invention. Code, 3...Rotation axis, 5...Spool, 6...Spool canopy, 7...Spool boss, 8...Support Arm, 8'... Support arm bent part, 9... Through hole, 10... Cord, 13... Nut, 12... Cord free end, 15...lower member.

Claims (1)

[Scope of utility model registration request] An engine 2 is attached to the upper end of a long rod 1 into which the rotary shaft 3 of the portable power mower is inserted to drive the rotary shaft 3, and a cutting blade device 4 is attached to the lower end of the long rod to drive the rotary shaft 3. A lower member 15 is provided in which a spool 5 having a canopy 6 that is rotatable integrally with the rotating shaft 3 is fitted and vertically assembled to the lower part of the boss portion 7 of the spool 5. are provided coaxially and loosely fitted together, and are integrally tightened with a nut 13 on the top and bottom at the lower end of the rotating shaft 3. At least one support arm 8 is provided protruding from the lower member 15 in the horizontal direction, and its tip is connected to the above-mentioned A bending part 8 is provided which bends near the outer circumference of the spool 5 to close off a part of the outer circumference of the spool 5, and a radial through hole 9 is provided in the bending part 8' to serve as a cord support member. A cord 10 made of a flexible wire such as nylon is wound around the spool 5, and its inner end is fixed to the spool 5, and the other end is extended outward through the through hole 9 of the cord support member to a suitable length. A cord blade head for a power mower that is provided with a free end 12 and rotated together with a rotating shaft 3 to create a horizontal rotating plane.