JPH0675117U - Blade mounting structure for mower - Google Patents

Abstract

(57) [Summary] [Purpose] To attach and detach the blade quickly and easily. [Structure] Locking recesses 12 and 12 are provided on a convex portion 18 on the back side 4b of a blade holder that rotates integrally with a motor shaft 2b, and a triangular shape is formed at a position which is rotated and moved approximately 90 degrees from the locking recesses 12 and 12. A rotation stopper 19 of the presented holding member 6 is provided in a projecting manner, and the holding member 6 loosely fitted in the tubular portion 10 of the blade holder 4 has a moving groove 20 that matches the rotation trajectory of the headed pins 9, 9. Protrusions 11, 11 corresponding to 20 and the locking recess 12 are formed. The blades 21, 21 have blades 22, 22 on both sides thereof, and the headed pins 9, 9 are inserted through the through holes 23, 23 provided in the base end 21a into the moving grooves 20, 20 of the holding member. The blade 21,
Reference numeral 21 is pivotally mounted between the blade holder 4 and the holding member 6 about the headed pins 9, 9 so as to be rotatable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a grass mower having a blade made of synthetic resin or metal that is pivotally supported by a rotating body and radially protrudes from a rotating body that is driven by a motor to rotate the blade. The present invention relates to a blade mounting structure that facilitates the operation.

[0002]

[Prior art]

 Since the blade of a mower is damaged by use and needs to be replaced, it is removably attached to the rotating body. As the mounting structure, for example, as disclosed in Japanese Utility Model Publication No. 56-26509 and Japanese Utility Model Laid-Open No. 1-66815, a rotating member is attached to the rotating body by a pin and a nut, or a spring member that biases the pin and the pin toward the pivot side. As disclosed in Japanese Utility Model Publication No. 61-24042, a blade which pivotally attaches the base end of a blade is fixed to a rotor with a leaf spring whose free end is biased toward the rotor. It is known that each pin has a pin attached to its free end and a rotating body to pivotally support the base end of the blade to facilitate the attachment / detachment of the blade.

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, since the two publications mentioned above use fine parts such as pins, it is troublesome to attach them and there is a risk that the pins, nuts, etc. may be lost during the blade attaching / detaching work. . In the third publication, when the elastic force of the leaf spring is reduced due to long-term use, the blade cannot be securely pivoted, and the blade may even come off during mowing work.

[0004]

[Means for Solving the Problems]

 Therefore, the present invention provides a highly reliable blade mounting structure with a simple structure that facilitates blade attachment / detachment work. The structure is a rotary disk that is fixed orthogonally to the rotary shaft of the motor. And a rotating plate which is located on the opposite side of the motor of the rotating plate and is coaxially rotatable, and a base end of which is pivotally attached between the rotating plate and the rotating plate, and which is rotated in a radial direction by centrifugal force. It consists of a blade that can project, and the pivot shaft of the blade is projected on either one of the rotary disc and the rotary disc, and at the other end, at the tip of the pivot shaft by relative rotation with the one. The present invention is characterized in that a corresponding retaining position of the blade and an opening position where the tip of the pivot shaft is opened can be changed, and a retaining portion is provided which enables locking at the retaining position. .

[0005]

[Action]

 When installing the blade, rotate either the turntable or the turntable to move the tip of the pivot shaft to the open position of the other retaining part, and the tip of the pivot shaft becomes free and the base end of the blade. Can be inserted into the pivot. Then, when the rotary disc or the rotary disc is rotated again to move the tip of the pivot shaft to the other retaining position, the base end of the blade is pivotally attached and retained between the rotary disc and the rotary disc and rotates. The board and swivel board are locked in the retaining position. Therefore, the work of attaching and detaching the blade can be performed quickly and easily by rotating only one member.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a mower according to the present invention. The mower 1 has a motor housing 2a which is connected to a manual portion (not shown) by a long pipe and has a built-in motor 2, and a blade 21 which radially projects and rotates by a motor drive. The rotary body 3 includes a blade holder 4 as a rotary disk that rotates integrally with the motor shaft 2b, a holding member 6 as a rotary disk that is rotatably attached to the blade holder 4, and a key. It is composed of the cap 14. In this embodiment, since the motor shaft 2b rotates counterclockwise, the blade holder 4 is connected to the motor shaft 2b by fastening the fitting screw 7 fitted to the tip of the motor shaft 2b to the screw hole 4a with the reverse screw. To be done. Therefore, at the time of mounting, the fitting screw 7 previously fitted to the tip of the motor shaft 2b is applied to the screw hole 4a, and the groove 7a at the tip of the fitting screw 7 is driven from the back side 4b of the blade holder 4 by the driver. Each is rotated clockwise to fix the screw with the blade holder 4. A fan 8 is integrally attached to the upper surface of the blade holder 4, and two headed pins 9 and 9 are inserted into the through holes 5 and 5 in a point-symmetrical manner on the outer periphery, and the tip portions 9a and 9a are on the back side. 4b. Further, the holding member 6 is rotatably attached to the lower portion of the blade holder 4 by inserting the tubular portion 10 having the screw hole 4a of the blade holder 4 extending downward into the fitting hole 6a. When the projections 11, 11 on the surface are locked in the locking recesses 12, 12 on the back side 4b of the blade holder, the holding member 6 rotates integrally with the blade holder 4. Further, a cap 14 is arranged below the holding member 6 via a washer 13, and the cap 14 is tightened by tightening a tightening screw 15 into the screw hole 4a of the tubular portion 10 of the blade holder with a reverse screw through the fixing hole 14a. It is fixed by kicking, and the tightening screw 15 is pivotally supported by the ball bearing 16 provided in the fixing hole 14a. Therefore, when the motor shaft 2b is rotated in the state of FIG. 1, the members other than the cap 14, that is, the fitting screw 7, the blade holder 4, the holding member 6, and the tightening screw 15 rotate together. Reference numeral 17 is a safety cover fixed to the lower part of the motor housing 2a.

FIG. 2 is an explanatory view of the assembly of the rotating body 3, showing only the blade holder 4 as viewed from the back side. The back side 4 b of the blade holder is provided with a ring-shaped protrusion as a spacer between the holding members 6. A portion 18 is formed, and the engaging concave portions 12, 12 are provided on the convex portion 18 on a straight line connecting the tip portions 9 a of the protruding headed pins. Detents 19, 19 of the holding member 6 having a triangular shape are provided in a projecting position at a position rotated by a degree. The holding member 6 is a plate-shaped piece that is point-symmetric with respect to the fitting hole 6a, and has moving grooves 20 and 20 that match the rotation orbits of the headed pins 9 and 9 and ends of the moving grooves 20 and 20. Protrusions 11, 11 corresponding to the locking recess 12 are formed on a straight line connecting the 20a, 20a. Further, while the motor is being driven, the holding member 6 rotates and the cap 14 is in a stopped state as described above. Therefore, the fitting hole 6a on the back side of the holding member has a thick wall between the washer 13 and the holding member 6 in order to keep the gap between them. A step portion 6b is formed, and the step portion 6b is continuous with a flange portion 6c provided around the holding member 6 as a reinforcing portion. The blades 21 and 21 have a strip-like shape made of synthetic resin having blades 22 and 22 formed on both sides thereof, and the headed pins 9 and 9 are inserted through the through holes 23 and 23 provided at the base ends 21a and 21a. The blades 21, 21 are rotatably pivoted between the blade holder 4 and the holding member 6 about the headed pins 9, 9 by being fitted into the moving grooves 20, 20 of the holding member 6.

In the mower configured as described above, in the assembled state of the rotating body 3, the projections 11 and 11 of the holding member 6 are fitted into the locking recesses 12 and 12 of the blade holder 4, respectively, as shown in FIG. At the same time, the tips 9a, 9a of the headed pins 9, 9 are located at the ends 20a, 20a of the moving grooves 20, 20. Therefore, when installing the blades 21, 21, loosen the tightening screw 15 and rotate the blade holder 4 counterclockwise with the holding member 6 fixed with one hand (or conversely, with the blade holder 4 fixed, the holding portion). Even if the member 6 is rotated clockwise), the engagement between the locking recesses 12 and 12 and the protrusions 11 and 11 is released, and the tips 9a and 9a of the headed pins 9 and 9 are also moved to the moving grooves 20 and 20. 3a, and the edge portions 6d and 6d of the holding member 6 come into contact with the rotation stoppers 19 and 19 of the blade holder 4 to stop, and as shown in FIG. Will be free. When the through holes 23, 23 of the blade base ends 21a, 21a are fitted into the head pin end portions 9a, 9a and the blade holder 4 is rotated clockwise or the holding member 6 is rotated counterclockwise, as shown in FIGS. 3B, the headed pin tips 9a, 9a move to the moving groove ends 20a, 20a while the blades 21, 21 are pivotally supported, and the projections 11, 11 again engage the locking recesses 12 as shown in FIG. , 12 respectively. Finally, when the tightening screw 15 is tightened, the holding member 6 is fixed to the blade holder 4 and the mounting of the blades 21 and 21 is completed. As described above, according to this embodiment, the tip 9a of the headed pin that pivotally supports the blade 21 is exposed only by loosening the tightening screw 15 and rotating the blade holder 4 or the holding member 6. 21 can be easily attached and detached, and the blade can be securely prevented from coming off in the pivotally attached state. Further, it is not necessary to remove the parts, and the attachment / detachment work can be performed in a short time.

In contrast to the above, the protrusion 11 and the locking recess 12 may be provided with the protrusion 11 on the blade holder 4 side and the locking recess 12 on the holding member 6 side. Further, even if the headed pin 9 is provided on the holding member 6 side and the moving groove 20 and the insertion portion 24 for mounting the blade are formed on the back side of the blade holder 4 as shown in FIG. 4, the blade operates in the same manner as in the above embodiment. Is removable. Furthermore, two protrusions, locking recesses, and detents are provided at symmetrical positions, but it does not matter if only one of them is provided, and the moving groove is eliminated so that the tip of the headed pin comes close to the upper surface of the holding member. Good as a thing. In addition, in the above embodiment, the structure in which the strip-shaped holding member is rotated to the retaining position and the open position has been described. However, if the moving groove and the insertion hole as shown in FIG. The mounting structure of the present invention can be applied by appropriately changing the shape of the holding member such as a cross shape or a disk shape even if the blade is attached at three or more places.

[0010]

[Effect of device]

 As described above, according to the present invention, the blade can be easily attached / detached by operating only a part of the rotary disc or the rotary disc without removing the parts and the like. Wearing is surely done.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a mower of the present invention.

FIG. 2 is an assembly explanatory diagram of a rotary body of the mower.

FIG. 3 (A) is an explanatory view showing a mounted state of a blade. (B) It is explanatory drawing which shows the attachment state of a blade.

FIG. 4 is an explanatory view showing another embodiment of the mounting structure.

[Explanation of symbols]

1 ... Mower, 2 ... Motor, 3 ... Rotating body, 4 ...
Blade holder, 5 ... Through hole, 6 ... Holding member, 7 ...
・ Mating screw, 8 ・ ・ Fan, 9 ・ ・ Headed pin, 10 ・ ・
Cylindrical part, 11 ... Protrusion, 12 ... Locking recess, 13 ... Washer, 14 ... Cap, 15 ... Tightening screw,
16 ... Ball bearings, 17 ... Safety covers, 18
..Convex part, 19..Rotation stop, 20..Movement groove, 21 ..
・ Blade, 22 ・ ・ blade part, 23 ・ ・ through hole, 24 ・ ・ insertion part

Claims (1)

[Scope of utility model registration request] 1. A rotary disk fixed to a rotary shaft of a motor in an orthogonal manner, a rotary disk located on the opposite side of the rotary disk from the motor and coaxially rotatable, and a rotary disk rotating with the rotary disk. The base end is pivotally mounted between the moving plates, and is composed of a blade that can be projected in the radial direction by centrifugal force.A pivot shaft of the blade is provided on either one of the rotating plate and the rotating plate so as to project to the other. , By relative rotation with the one side, it is possible to change between a blade retaining position corresponding to the tip of the pivot shaft and an open position where the pivot shaft tip is opened, and locking at the retain position is possible. A blade mounting structure for a mower, which is provided with a retaining portion that enables it.