Cutlery – Cutting tools – With blade moving means
Patent
1992-09-10
1994-09-13
Seidel, Richard K.
Cutlery
Cutting tools
With blade moving means
B26B 2700
Patent
active
053456831
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rotary cutter for a mowing machine which mows weeds and lawns by using a cord cutter.
BACKGROUND ART
To mow weeds and lawns around a wall, a fence, an iron pole, or the like, or at a place where many obstacles exist, if a metallic (usually stainless steel) blade is used, sometimes the blade is chipped or pieces of an object cut by the blade are scattered to pose a danger. Hence, a cord, e.g., a nylon cord, is used as the cutter.
When a nylon cord is used as the cutter, in this manner, the wearing degree of the wound nylon cord is high, and the nylon cord is replaced every time it is worn. To replace the nylon cord, however, in a conventional rotary cutter, the nylon cord is taken out through a notched portion formed in the flange of the reel. Thus, when the nylon cord is to be replaced, all the components of the rotary cutter must be removed, the reel must be taken out from the case, a new nylon cord must be wound on the reel, and the reel must be set in the case. It is very cumbersome to perform this operation during mowing.
In the conventional rotary cutter, the nylon cord is extracted from the reel by the centrifugal force which is generated upon rotation of the rotary cutter when the mowing machine is operated. Thus, when the nylon cord is to be extracted because it has become short, a terminal member must always be pressed during rotation of the rotary cutter. During the extraction operation, the rotary cutter is not stably supported because it is rotated. When the terminal member is struck against a hard ground, not only the terminal member but also the case body is undesirably struck to damage the case body and the terminal member, causing a crack in or damaging them. Then, the rotary cutter becomes defective before it is fully utilized.
If the rotary cutter is not stably supported when the terminal member is struck, stones and lumps of soil are scattered upon striking to endanger the operator or people nearby.
It is an object of the present invention to provide a rotary cutter for a mowing machine in which a cord can be easily replaced, and when a nylon cord as the cutter is worn in an early stage, a necessary amount of nylon cord can be reliably extracted while rotation of the rotary cutter is stopped.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 6 show a rotary cutter for a mowing machine according to an embodiment of the present invention, in which
FIG. 1 is an overall longitudinal sectional view;
FIG. 2 is a partially cutaway plan view;
FIG. 3 shows a state in which a nylon cord is mounted;
FIG. 4 is a sectional view of a stopper pin guide portion;
FIG. 5 is a view showing an operating state of the first stage of the stopper pin when a main shaft is depressed; and
FIG. 6 is a view showing an operating state of the second stage of the stopper pin when the main shaft is depressed.
EMBODIMENT
An embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to FIGS. 1 to 6, reference numeral 1 denotes a cylindrical case body having one open end and a bottom surface la. A bearing 4 is provided to vertically stand on a central portion of the bottom surface 1a of the case body 1. A vertical axial hole 2 having two open ends and a keyway is formed in the bearing 4. A pair of elongated holes 3 are formed in the inner circumferential surface of the axial hole 2 to oppose each other at appropriate portions in the longitudinal direction of the bearing 4. A left-handed thread is formed on the outer circumferential surface of the bearing 4. Reference numeral 5 denotes a whole portion of a reel. A receptacle flange 7 is provided to the lower end of a cylindrical take-up member 6 to be capable of being inserted in the case body 1, and a support flange 11, having a plurality of trapezoidal transparent windows 8 of arbitrary sizes that allow internal observation, an outer frame 9 provided with antiskid members 9a on its outer periphery, and an annular projection 10 on its upper surface, is formed at the up
REFERENCES:
patent: 4134204 (1979-01-01), Perdue
patent: 4168572 (1979-09-01), Ewing
patent: 4203212 (1980-05-01), Proulx
patent: 4738085 (1988-04-01), Nishio et al.
patent: 4779405 (1988-10-01), Everts
patent: 4813140 (1989-03-01), Calcinai
patent: 4823465 (1989-04-01), Collins
patent: 4882842 (1989-11-01), Baba
patent: 5095688 (1992-03-01), Fabrizio
Heyrana Paul M.
Seidel Richard K.
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