JP7289999B1 - push mower - Google Patents

Abstract

The present invention provides a hand-push mower capable of moving the mower body in undulating and horizontal directions with a small operating force and capable of sufficiently mowing a predetermined range. A lower structure 10 supporting wheels 21, an upper structure 30 supporting a mower body 40 and a handle 51, and a rotation support mechanism 70 rotatably supporting the upper structure 30 and the lower structure 10. a hoisting support mechanism 80 that hoistably supports the upper structure 30 on the rotation support mechanism 70; 90, and a position regulating biasing mechanism 110 that spans between the upper structure 30 and the lower structure 10 and biases the upper structure 30 to return to a predetermined position of the lower structure 10. 40 can be rotated in the horizontal direction and raised and lowered in the vertical direction, and the operating force in the raising and lowering direction and the horizontal direction can be reduced by the load supporting and urging means 90 and the position regulating and urging mechanism 110 . [Selection drawing] Fig. 1

Description

The present invention relates to a push mower.

Conventionally, various types of mowers of this kind have been proposed. Among the mowers of this type, for example, Patent Document 1 discloses a mower in which a cutting blade as a mowing head can be oscillated left and right to enable mowing even near fences and obstacles. is described in This hand-push type mower consists of a base having a long-handled handle that is supported by left and right wheels and that extends rearward so that the vertical angle can be changed, and a working part that is mounted on the base and has a mowing head in front of it. It's a lawn mower. This push-type lawn mower allows the working part to swing left and right with respect to the stand without interfering with the wheels, and can be fixed at a predetermined swing angle, so that the swing can be operated by the handle. It's becoming

However, in the mowing machine disclosed in Patent Document 1, the mowing head can be swung left and right and fixed at a predetermined swing angle, so mowing is possible up to fences and obstacles. However, since the mowing head is fixed in a swinging state, a large operating force is required, and it is difficult for the elderly and women to operate. In addition, when mowing weeds growing on uneven ground, the weight of the drive source such as the engine and the entire frame must be supported by the handle to operate the machine, which increases the operational burden.

Patent Document 2 discloses a hand-push mower capable of efficiently mowing weeds growing on uneven ground. In this push mower, a cutting blade drive mechanism is supported on a frame having wheels, and a handle to be gripped by an operator is provided so as to extend rearward from the frame. This cutting blade drive mechanism is supported by the frame via a suspension mechanism in a posture in which the support tube of the cutting blade drive mechanism is inclined such that the tip portion is lower than the rear end portion.

In the mower disclosed in Patent Document 2, the cutting blade driving mechanism having the cutting blades is supported by the frame via the suspension mechanism. Therefore, the positional relationship of the cutting blade with respect to the ground can be properly maintained at all times. In addition, while the power source is protected from vibration impacts, the cutting blade drive mechanism is fixedly supported by the frame via a suspension mechanism, so that the operator can directly control the blade according to the unevenness of the ground. The cutting blade driving mechanism could not be raised and lowered, and the operating force was not reduced.

JP 2005-229856 A JP 2014-103913 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hand-push mower capable of moving the mower body in undulating and horizontal directions with a small operating force and capable of sufficiently mowing a predetermined range.

The present invention provides a lower structure that rotatably supports wheels, an upper structure that supports a mower body and a handle, a rotary support mechanism that rotatably supports the upper structure and the lower structure, and the a hoisting support mechanism that supports the upper structure so that it can be raised and lowered with respect to the rotating support mechanism; a load supporting and urging means for bearing the load applied to the upper structure and reducing the operating force for raising and lowering the handle; and a position regulating biasing mechanism that biases the structure back to a predetermined position.

In the present invention, it is preferable that the load supporting and urging means is composed of a compression coil spring, and is provided with support and urging force adjusting means for adjusting the urging force of the compression coil spring.

In the present invention, the support biasing force adjusting means includes a slide guide member provided in the rotation support mechanism, and the end portion of the compression coil spring on the rotation support mechanism side can slide along the slide guide member. and the end of the compression coil spring on the side of the upper structure is in contact with the upper structure so as to be able to come into contact with and separate from the upper structure.

In the present invention, it is preferable that two wheels are provided on the lower structure and arranged in series in the traveling direction of the mower.

In the present invention, a guide member attached to the upper structure, a slide member to which the handle is attached and slidably provided on the guide member, and engagement between the guide member and the slide member It is preferable that a position adjustment mechanism is provided so that the position of attachment of the handle to the upper structure can be changed.

In the present invention, a cutoff switch is provided for stopping the drive of the mower main body in case of emergency, etc. The cutoff switch is connected to an electric circuit connected to the stop switch of the drive source of the mower main body and always biased in the closing direction. a switch body provided in the middle of the electric circuit and having a contact that can be connected and separated; an insulating member that is detachably inserted between the contacts of the switch body that can be contacted and separated; It is preferably configured with an operating member that is mounted on the operating member.

In addition, in the present invention, the rotation support mechanism that rotatably supports the upper structure and the lower structure is configured by a thrust bearing provided between the upper structure and the lower structure. is also possible.

Further, in the present invention, the position regulating biasing mechanism can be composed of two extension coil springs stretched between the upper structure and the lower structure.

Further, in the present invention, there is provided a locking mechanism for fixing the positions of the upper structure and the lower structure, the locking mechanism comprising a first locking member locked to the upper structure; A second locking member locked to the lower structure, and the first locking member and the second locking member are supported so as to be positionally adjustable, and the first locking member and the second locking member are supported. It is also possible to provide a moving mechanism for moving two locking members to fix or release the movement of the upper structure and the lower structure.

According to the present invention, it is possible to provide a push-type mower capable of moving the mower body in the undulating direction and the horizontal direction with a small operating force, and capable of sufficiently mowing a predetermined range.

It is a side view showing the whole one embodiment of the present invention. It is a perspective view which shows the whole this embodiment. It is an exploded perspective view showing a lower structure concerning this embodiment. FIG. 2 is an exploded perspective view showing the main parts of the upper structure, the rotation support mechanism and the lock mechanism according to the embodiment, with a part cut away; It is a side view which shows the support biasing force adjustment means of this embodiment. FIG. 3 is a partially cutaway perspective view showing the main part of the position restriction biasing mechanism according to the embodiment; It is a sectional view showing an interception switch of this embodiment.

One embodiment of the present invention will be described based on the drawings.

1 and 2, the push mower 1 of this embodiment includes a lower frame 10 as a lower structure that rotatably supports wheels 21, and an upper structure that supports a mower body 40 and a handle 51. A frame 30, a thrust bearing 70 as a rotation support mechanism that rotatably supports the upper frame 30 with respect to the lower frame 10, and a hoisting support mechanism that supports the upper frame 30 with respect to the thrust bearing 70 so that it can hoist vertically. and a side stand 22 whose one end is rotatably supported by the lower frame 10 .

The mower main body 40 covers an engine 41 as a drive source, a cutting blade 42 for mowing, a driving mechanism 43 for transmitting the rotational driving force of the engine 41 to the cutting blade 42, and a shaft portion (not shown) of the driving mechanism 43. A main pipe 44, a scattering prevention cover 45 attached to the main pipe 44 to prevent pebbles and other flying objects generated during work, and a throttle lever attached to the handle 51 and capable of manipulating the rotation state of the engine 41 via a wire 46. 47.

As shown in FIG. 3, the lower frame 10 as a lower structure includes a wheel support frame 11 formed in a U-shape as a whole and a center support frame 12 erected at the center of the wheel support frame 11. and the vertical direction between the wheel support frame 11 and the central support frame 12 at the junction between the rear support frame 13 erected at the rear of the wheel support frame 11 and the central support frame 12 and the rear support frame 13 and a stand mounting member 14 that spans over.

One end of a side stand 22 similar to that attached to a motorcycle or the like is attached to the stand attachment member 14 via a bracket 23 so as to be able to rotate about 90 degrees. A tension spring 24 is attached so that the side stand 22 can be held in a stand position and a running position.

A pair of support projections 28 made of trapezoidal rubber for raising the frame are attached to the lower end of the rear support frame 13. With the support projections 28 side facing down, the entire hand-push mower 1 can be seen in FIGS. By rotating clockwise, the mower 1 as a whole including the lower frame 10, the upper frame 30, etc. is started up, so that necessary parts can be inspected and repaired easily.
The main frame of the upper frame 30 and the lower frame 10 of this embodiment is composed of steel square pipes.

Two wheels 21 are rotatably supported by two pairs of bearings 15 provided on the lower surface of the wheel support frame 11 via one shaft 16 each. Nuts 17 are screwed to the vicinity of both ends of the shaft 16 protruding from the wheel support frame 11, and snap pins 18 are inserted into the ends of the shaft 16 outside the nuts 17, respectively. is prevented from coming off. Spacers 19 are interposed between both side surfaces of the wheel 21 and the inner surface of the wheel support frame 11 on the outer periphery of the shaft 16 inside the U-shape of the wheel support frame 11 .

A U-shaped plate member 11A is fixed to the U-shaped bent portion of the wheel support frame 11, and a rubber cover 11B having a U-shaped cross section is fitted to the outer surface of the plate member 11A from above. . As a result, even when the front end of the lower frame 10 comes into contact with a hard portion such as a stone step during mowing with the push mower 1, the impact on the mower 1 can be reduced.
In addition, the clipped grass entangled with the rubber cover 11B or the like after mowing can be easily removed by removing the rubber cover 11B.
Also, the position of the rubber cover 11B is such that when the upper frame 30 is raised for inspection or repair of the engine 40 or the like, the tip of the handle shaft 52, which will be described later, is exactly on the rubber cover 11B. The tip of the handle shaft 52 is prevented from being damaged.
Furthermore, when the mower body 40 is erected using the handle 51 and the support projections 28 when the mower blade 42 is replaced or the rear wheels 21 are replaced with double tires, the main pipe 44 may interfere with the U-shaped plate member 11A. However, the main pipe 44 is protected by the rubber cover 11B.

As is clear from FIGS. 1 and 2, the two wheels 21 are arranged in series in the front-rear direction along the traveling direction of the push-type mower 1 .

In FIG. 4, the upper frame 30 includes a base member 31 attached to a thrust bearing 70 as a rotation support mechanism via a hinge 80 as a lifting support mechanism so as to be freely raised and lowered in the vertical direction, and a lower end portion fixed to the base member 31. A riser frame 33 which has a handle mounting member 32 at its upper end and is folded into a doglegged side surface, an engine mounting member 34 provided at the lower portion of the riser frame 33, a base member 31, and a riser frame 33. and a reinforcing member 35 provided between the rising portion.

A thrust bearing 70 as a rotation support mechanism is composed of a plate-shaped iron member having a hole 71A formed in the center thereof, and includes a housing bearing washer 71 as a lower bearing washer fixed to the central support frame 12, and a housing. A shaft washer 73 as an upper washer, which is composed of a plate-shaped iron member arranged to face the bearing washer 71 and has a shaft member 72 erected downward at the center, and a retainer. A large number of rolling elements 75 rotatably supported by 74 and a shaft member 72 protrude from the lower surface of the housing washer 71 through the center hole 74A of the retainer 74 and the central hole 71A of the housing washer 71. A shaft snap ring 76 is fitted and locked in a groove 72A provided in the shaft member 72 to prevent the shaft member 72 from coming off from the housing raceway washer 71. As shown in FIG.

A hinge 80 as a lifting support mechanism has one blade 81A fixed to a mounting bar 82 fixed to the upper surface of the shaft washer 73, and the other blade 81B fixed to the base member 31 of the upper frame 30. .
Thereby, the upper frame 30 is configured to be able to rise and fall with respect to the thrust bearing 70 as a rotation support mechanism.

Between the lower frame 10 and the thrust bearing 70, a hinge 80 as a lifting support mechanism is opened, that is, the upper frame 30 is biased in the upright direction, and a part of the load applied to the upper frame 30 is borne. A pair of compression coil springs 90 are provided as load supporting and urging means for reducing the operating force for raising and lowering the handle 51 .
The urging force of the compression coil spring 90 can be adjusted by the support urging force adjusting means 100 . As shown in FIG. 5, the supporting biasing force adjusting means 100 includes a pair of plate-like sliding guide members 101 provided on the upper surface of the shaft bearing washer 73 at a predetermined interval in the longitudinal direction in FIG. ing. The sliding guide member 101 is formed by forming a springy iron plate material into a flat Ω shape, and is attached to the shaft washer 73 with a bolt 102 and a nut 103 .

The sliding guide member 101 is slidably attached to the lower end of the compression coil spring 90, that is, the end on the side of the thrust bearing 70, which is a rotation support mechanism, and the upper end of the compression coil spring 90, that is, the upper structure. The end portion on the side of the upper frame 30, which is the body, is in contact with the lower surface of the base member 31 so as to be slidable and separable.
Thus, by moving the compression coil spring 90 along the sliding guide member 101 in the left-right direction in FIGS. It's becoming That is, if the compression coil spring 90 is moved leftward in FIGS. The bearing capacity of the applied load is reduced.
It should be noted that the compression coil spring 90 may use other biasing means such as a leaf spring or a gas spring.

4 and 6, a position regulating biasing mechanism 110 is provided between the front and rear side surfaces of the base member 31 and the rear support frame 13. As shown in FIG. 1 and 2, the position regulation biasing mechanism 110 includes an eyebolt 111 as a locking member attached to the side surface of the base member 31, one end of which is locked to the eyebolt 111, and the other end of which is locked to the eyebolt 111. and a pair of extension coil springs 112 whose ends are attached to the upper end of the rear support frame 13 via swivel bolts 115 .
A commercially available swivel bolt 115 can be used. A bolt body 116 is attached through the rear support frame 13, and the bolt body 116 is rotatably attached to the tip of the bolt body 116. It is composed of a rotating head 117 whose end is locked and a double nut 118 screwed into a portion of the bolt body 116 that penetrates the rear support frame 13 so that the position can be adjusted.

With such a configuration, by changing the screwing position of the nut 118 with respect to the bolt body 116, the extension amount of the tension coil spring 112 is changed, and the biasing force of the tension coil spring 112 can be adjusted.
At this time, if there is no need to adjust the urging force of the tension coil spring 112 by a mower (operator) or the like, the other end of the tension coil spring 112 can be connected by an appropriate connection means without using the swivel bolt 115 . and the rear support frame 13 may be connected. For example, a plastic binding band can be used as a suitable connection means. In this case, the binding band is stretched between the other end of the tension coil spring 112 and the rear support frame 13, and the length of the binding band is adjusted so that the tension coil spring 112 can exert a predetermined biasing force. , the base member 31 and the rear support frame 13 can be connected with a predetermined biasing force.

The mounting position of the swivel bolt 115 to the rear support frame 13 is inside the mounting position of one end of the eyebolt 111 to the base member 31 , that is, the mounting position of the pair of tension coil springs 112 to the base member 31 is closer to the rear support frame 13 . The mounting interval to the is set smaller. As a result, the position of the upper frame 30 with respect to the lower frame 10 is regulated, and the tensile forces of the pair of tension coil springs 112 are made equal in the longitudinal direction in FIG. A main pipe 44 of 40 is set so as to face the central axis direction of the hand-push mower 1 . Here, the central axis of the push mower 1 coincides with the arrangement direction of the two wheels 21 .

1 and 2, the upper end of a handle shaft 52 as a sliding member made of a long steel square pipe is fixed to the central portion of the handle 51 via a bracket 51A. It is slidably inserted through a guide member 53 which is also made of a steel square pipe and whose intermediate portion is fixed to the lower surface of the member 32 . The handle shaft 52 is provided with a large number of positioning holes 54, for example, eleven positioning holes 54 at predetermined intervals.

Engagement holes 55 are formed at two upper and lower positions of the guide member 53 at an integral multiple, for example, four times the predetermined spacing of the positioning holes 54 . The engaging holes 55 are provided as through holes on both the upper and lower surfaces of the guide member 53 .
At a position where the engaging hole 55 of the guide member 53 and the positioning hole 54 of the handle shaft 52 are aligned, the set screw 56 is inserted through the engaging hole 55 and the positioning hole 54, and the threaded portion of the tip of the set screw 56 is inserted. is screwed into the screw hole of the positioning hole 54 on the lower surface of the handle shaft 52 .

Thus, by sufficiently screwing the set screw 56 into the positioning hole 54 , the handle shaft 52 as a sliding member is positioned and fixed to the guide member 53 . Therefore, by changing the position where the engagement hole 55 and the positioning hole 54 are aligned, the engagement position of the handle shaft 52 with respect to the guide member 53 can be changed, and the mounting position of the handle 51 with respect to the upper frame 30 can be easily changed.
Here, a handle position position adjustment mechanism that enables the engagement position between the handle shaft 52 and the guide member 53, in other words, the length of the handle 51, to be changed and adjusted by the positioning hole 54, the engagement hole 55, and the set screw 56. 60 is configured.

The handle shaft 52 as a sliding member and the guide member 53 do not necessarily have to be made of square pipes, and the handle shaft 52 as a sliding member slides along the guide member 53 and is attached to the handle shaft 52. It is sufficient that the position of the handle 51 can be changed with respect to the upper frame 30 .
For inspection and maintenance of the mower main body 40 and the thrust bearing 70, the tip position of the handle shaft 52 can be adjusted by removing the pair of tension coil springs 112 of the position regulating biasing mechanism 110 from the eyebolts 111 on the side surface of the base member 31 and moving the handle shaft 52 to the hinge. 1 and 2, the U-shaped plate member 11A and the rubber cover 11B are positioned so that the tip of the handle shaft 52 just abuts the rubber cover 11B when the upper frame 30 is raised about 80 in the counterclockwise direction in FIGS. is provided.
As a result, the tip of the handle shaft 52 is protected by the rubber cover 11B and is prevented from being deformed.
Grips 57 are provided at both ends of the handle 51 .

In FIG. 4 , reference numeral 120 is a lock mechanism 120 that fixes rotation and ups and downs of the upper frame 30 with respect to the lower frame 10 . The locking mechanism 120 includes a T-shaped main body 121, a pair of L-shaped upper frame locking members 122 fixed to the upper surface of the main body 121 and capable of being locked to the upper frame 30, and a lower frame. A lower frame locking member 123 formed by covering the surface of a plate material such as an iron plate with a hard rubber plate or the like so as to be able to be locked to the central support frame 12 of 10, and attached to the T-shaped end of the main body 121. The upper frame locking member 122 and the lower frame locking member 123 are supported so as to be positionally adjustable, and the upper frame locking member 122 and the lower frame locking member 123 are moved to control the movement of the upper frame 30 and the lower frame 10. and a moving mechanism 124 for fixing or releasing the .
The moving mechanism 124 has, for example, a structure similar to a window locking device that fixes the movement of a sliding window.

Specifically, the moving mechanism 124 is rotatably supported by a case 125 which is attached to one end of the lower frame locking member 123 and which is vertically slidably provided at the T-shaped end of the main body 121 . and an operation knob 126 for driving the case 125 up and down with respect to the main body 121 . In such a configuration, by rotating the operation knob 126, the case 125 is driven up and down via a motion conversion mechanism (not shown) incorporated in the case 125. As shown in FIG.
The motion conversion mechanism (not shown) includes, for example, a rotating disk with a large number of locking pins provided inside the case of the operation knob 126, and a large number of linearly arranged rotary discs fixed to the T-shaped end of the main body 121. By rotating the operation knob 126, the locking position between the locking pin of the rotating disk and the small hole of the guide plate can be changed. Accordingly, by rotating the operation knob 126, the lower frame locking member 123 can be driven up and down together with the case 125. As shown in FIG.

The mechanism for driving the lower frame locking member 123 up and down is not limited to the structure similar to that of the window locking device for fixing the movement of the double sliding window, and other mechanisms may be used. To give an example, for example, a bolt is supported at the T-shaped end of the main body 121 so as to be rotatable about the vertical direction as an axis and not to move in the vertical direction, and the tip of the bolt is attached to the lower frame locking member. The vertical position of the lower frame locking member 123 may be changed by screwing a nut provided on the 123 and rotating the bolt. At this time, the lower frame locking member 123 is slidable on the main body 121 and is prevented from rotating.
Here, the upper frame locking member 122 constitutes a first locking member locked to the upper frame 30 as the upper structure, and the lower frame locking member 123 constitutes the lower frame 10 as the lower structure. A second locking member is configured to be locked to.

The tips of the pair of L-shaped upper frame locking members 122 of the lock mechanism 120 are engageable with a pair of engagement holes 36 (see FIG. 6) formed in the rear end of the base member 31. The lower frame locking member 123 is moved to the farthest position from the main body 121 by rotating the operation knob 126, that is, to the position where the distance between the pair of upper frame locking members 122 is widest, and then the central portion is supported. It is insertable under the upper trailing edge of frame 12 .
In this state, the tip portions of the pair of upper frame locking members 122 are engaged with the pair of engaging holes 36, and the lower frame locking member 123 is inserted under the upper rear edge of the center support frame 12. By rotating the operation knob 126 to raise the lower frame locking member 123 and bring it into contact with the lower side of the upper rear edge of the central support frame 12, the upper frame locking member 122 and the lower frame locking member 123 are paired. The base member 31 and the central support frame 12 are sandwiched between the member 123 and the upper frame 30 is locked to the lower frame 10 .

FIG. 7 is a cross-sectional view showing a schematic configuration of the cut-off switch 130. As shown in FIG. The shut-off switch 130 is provided with a switch body 131 to stop the drive of the mower main body 40 in an emergency such as when work is finished or when the hand-push mower 1 overturns.
The switch body 131 includes a transparent cylinder 132 made of a transparent acrylic pipe or the like, end covers 133 made of an insulating material such as rubber engaged with both ends of the transparent cylinder 132, and an electric A pair of contact members 134 formed in the shape of bolts having heads 134A serving as contact points and arranged through end covers 133, and the heads 134A of the contact members 134 and the end cover at the outer periphery of each contact member 134. and compression coil springs 135 respectively interposed between the inner ends of 133 . Here, head 134A functions as a contact. Also, the biasing force of the compression coil spring 135 constantly biases the pair of contact members 134 in the closing direction.

The switch body 131 is connected to two electric lines 136 connected to an electric circuit of a stop switch (not shown) of the engine 41 . Two electric lines 136 are attached by two nuts 138 to the screw-like ends protruding from the end cover 133 of the contact member 134 via terminal plates 137 attached to each end.
An insulating member 150 is interposed between the head portions 134A of the pair of contact members 134 of the switch body 131. As shown in FIG.

The insulating member 150 can be inserted between the head portions 134A of the pair of contact members 134 through an opening 132A provided in the transparent cylindrical body 132, and a mounting ring attached to the other end of the insulating member 150. A string member 152 is attached to 151 as an operating member. The end portion of the string member 152 is formed in a loop shape, and the loop-shaped portion of the string member 152 and the handle 51 are connected via a string member position fixture 153 . The string member position fixing device 153 includes a loop string 153A wound around a suitable position of the handle 51 and a fastener 153B that fixes the loop string 153A to an arbitrary position of the handle 51. FIG.
As a result, the string member 152 is attached to the switch body 131 with one end fixed to an appropriate position on the handle 51 and the middle section hung down inside the handle 51 .
The insulating member 150 can be easily pulled out from between the head portions 134A of the pair of contact members 134 by pulling the string member 152 hanging inside the handle 51. As shown in FIG.
The insulating member 150 is made of a plate material such as rubber or leather, a bar material, or the like. The string member 152 as the operation member is not limited to a string, and may be a chain or other members as long as the member can pull out the insulating member 150 . In this case, the string is preferably a slightly hard plastic twisted string or a braided string in order to facilitate the pulling operation. Also, the string may be a string used for hanging the nameplate around the neck.

In FIG. 7, the tip of the upper contact member 134 protrudes through a mounting plate 139 made of a plate material formed in an open V shape, and is attached to the mounting plate by a wing nut 140 screwed into this protruding portion. 139 at one end. The other end of the mounting plate 139 is fixed by a wing bolt 141 to a bracket 51A fixed to the handle 51. As shown in FIG.
7, an operation ring 142 is attached to the tip of the lower contact member 134. By pulling the operation ring 142 downward against the biasing force of the compression coil spring 135, the head 134A of the contact member 134 is opened. is widened, and the insulating member 150 can be inserted.

As shown in FIG. 7, when the insulating member 150 is inserted between the heads 134A of the pair of contact members 134, the electrical connection between the pair of contact members 134 is cut off by the insulating member 150. The cut-off switch 130 is turned off. Therefore, the stop switch of the engine 41 does not operate, and the engine 41 is ready to be driven. On the other hand, when the string member 152 as the operating member is operated to pull the insulating member 150 out from between the head portions 134A of the pair of contact members 134, the pair of head portions 134A come into contact with each other, turning the cutoff switch 130 ON and stopping. The switch is actuated and the engine 41 is stopped.
The contact pressure between the heads 134A of the pair of contact members 134 can be adjusted by changing the screwing position of the nut 138 that is screwed on the upper contact member 134, and the pulling force of the insulating member 150 can be adjusted. can be adjusted.

Next, a specific usage method of this embodiment will be described.
With the insulating member 150 inserted between the heads 134A of the pair of contact members 134 of the cutoff switch 130, the engine 41 is driven to rotate the cutting blade . Next, the side stand 22 is removed and the handle 51 is operated to start mowing weeds.
With the cutting blade 42 tilted so that the left side is lowered by about 5 to 10 degrees with respect to the horizontal direction according to the condition of the growing grass, the push type mower 1 is moved forward while being swung laterally at a predetermined angle. mowing the lawn. At this time, by tilting the cutting blade 42 to the left side, the grass is gathered to the left side. Become.
Further, in this embodiment, since the thrust bearing 70 is provided, the cutting blade 42 can be swung with a small force.
Since the position control biasing mechanism 110 is provided between the upper frame 30 and the lower frame 10 for swinging the upper frame 30 in the horizontal direction, the upper frame 30 receives the tensile force of the tension coil spring 112. Since the push-type mower 1 is always urged toward the center in the traveling direction, which is a predetermined position, the cutting blade 42 always faces the forward grass, and the forward grass can be easily cut. Further, by appropriately adjusting the biasing force of the position regulation biasing mechanism 110, the swinging operation can be performed smoothly.

In the forward movement of the push mower 1, in this embodiment, two wheels 21 are provided in series in the traveling direction of the mower 1. Therefore, even if the ground to be mowed has a certain amount of unevenness or uneven ground, the mower can continue to operate. 1 can be tilted left and right to advance, and the forward operation can be performed with a small force.

When the ground to be mowed has large unevenness or the height of the grass varies greatly, it may be difficult to operate the conventional mower. Since the cutting blade 42 of the mower main body 40 can also be raised and lowered by the action of the hinge 80 as a raising and lowering support mechanism, the cutting blade 42 can be raised and lowered according to the height of the grass and unevenness of the ground.
At this time, since the compression coil spring 90 is provided between the upper frame 30 and the thrust bearing 70 as a load supporting and urging means, the upper frame 30 can be raised and lowered with a small force. On the other hand, since the upper frame 30 and the lower frame 10 are connected via the compression coil spring 90, the upper frame 30 and the lower frame 10 do not open in the undulating direction more than necessary, and the mowing operation becomes easier. no hindrance.
The hoisting force of the upper frame 30 can be easily adjusted by sliding the position of the compression coil spring 90 with respect to the sliding guide member 101 of the support/biasing force adjusting means 100. It is possible to adjust according to physical strength.
At this time, the undulating force of the upper frame 30 can be adjusted by changing the number of the compression coil springs 90 or by changing the spring constant.

When the mowing operation by the hand-push mower 1 is finished, the lower frame 10 and the upper frame 30 can be moved both horizontally and vertically by installing a locking mechanism 120 between the lower frame 10 and the upper frame 30.例文帳に追加Therefore, the push mower 1 can be easily stored in a barn or the like.
The lock mechanism 120 is attached to the push mower 1 in a state in which the operation knob 126 of the moving mechanism 124 is operated to spread the lower frame locking member 123 with respect to the upper frame locking member 122 . Specifically, the main body 121 is held, the upper frame locking member 122 is engaged with the engaging hole 36 of the upper frame 30, and the lower frame locking member 123 is attached to the upper side of the central support frame 12 of the lower frame 10. By engaging with the lower surface and operating the operation knob 126, the lower frame locking member 123 can be moved in the direction of approaching the upper frame locking member 122, that is, in the tightening direction, and the locking mechanism 120 can be easily attached. .

In the mowing operation, the mounting position of the handle 51 can be changed when the height of the operator differs. That is, the setscrews 56 inserted into the upper and lower engaging holes 55 of the guide member 53 are removed, and the alignment position between the positioning hole 54 of the handle shaft 52 as a sliding member and the engaging hole 55 of the guide member 53 is changed. By doing so, the mounting position of the handle 51 can be changed.
As a result, the operability of the push mower 1 can be further improved.

A pair of support projections 28 are provided on the lower portion of the rear support frame 13 of the lower frame 10. If the support projections 28 are positioned downward and the lower frame 10 is rotated clockwise in FIG. The lower frame 10 and the upper frame 30 can be erected with the cutting blades 42 facing upward, and inspection and cleaning of the cutting blades 42, the wheels 21, and other members can be easily performed.

According to this embodiment described above, there are the following effects.
Since the upper frame 30 to which the mower body 40 is attached is rotatably supported by the lower frame 10 via the thrust bearing 70, the cutting blade 42 of the mower body 40 can be swung with a small operating force.
In addition, since the upper frame 30 is supported by the lower frame 10 via the hinges 80 so that it can be raised and lowered, the cutting blade 42 of the mower body 40 can be raised and lowered with a small operating force. By raising and lowering the cutting blade 42 according to the height of the mower, the work can be performed efficiently without causing tangling of grass.
Since the compression coil spring 90 is provided between the upper frame 30 and the thrust bearing 70 , the urging force of the compression coil spring 90 can reduce the operating force of the lawn mower body 40 in raising and lowering. At this time, the biasing force of the compression coil spring 90 can be easily changed by changing the position of the compression coil spring 90 along the sliding guide member 101 of the support biasing force adjusting means 100 .

Furthermore, since the position regulation biasing mechanism 110 having a pair of tension coil springs 112 is provided between the lower frame 10 and the upper frame 30, the positions of the lower frame 10 and the upper frame 30 are always manually pushed. The mower 1 can be regulated at the center position in the traveling direction, and mowing in front can be facilitated. Since the urging force of the tension coil spring 112 can be easily adjusted by rotating the swivel bolt 115 as position regulation urging force adjusting means, the horizontal swing operating force of the push mower 1 can be easily adjusted.

Since the two wheels 21 are arranged in series on the lower frame 10 in the traveling direction of the push type mower 1, unlike the conventional mower in which two wheels are provided laterally with respect to the chassis, the push type mower can be used. The grass mower 1 can be easily advanced, and can be easily advanced while tilting the entire hand-push mower 1 in the left and right lateral directions even on uneven ground or muddy ground.

After the mowing work is finished, if the locking mechanism 120 is locked between the upper frame 30 and the lower frame 10, the upper frame 30 will not rotate or rise and fall with respect to the lower frame 10, and the storage work will be facilitated. can be In addition, the cutting blade 42 of the mower body 40 does not move sideways, and the storage work can be performed safely.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. are included in the present invention.

For example, in the above-described embodiment, the main frame of the upper frame 30 and the lower frame 10 is composed of iron square pipes, but other materials such as aluminum may be used. It may be rod, block-shaped, or a combination thereof.

Further, the rotation support mechanism is not limited to the thrust bearing 70, but may be a radial bearing or a slide bearing consisting of a shaft and a sleeve. However, if the thrust bearing 70 is used, a large load can be borne smoothly, and there is an advantage that the operating life can be extended.
The hinge 80 as the hoisting support mechanism may be composed of other mechanisms, such as shafts and bearings, and its installation position is not limited to the front end of the upper frame 30, but may be the center or rear end. However, if the hinge 80 is used, the hoisting support mechanism can be manufactured at a low cost. can.

The wheels 21 are not limited to two wheels in series in the traveling direction, and two wheels may be attached in the left and right lateral directions. There is Also, the wheels 21 may be three wheels, four wheels, or the like. When the wheels 21 are three wheels, if one front wheel and two rear wheels are arranged in parallel, there is an advantage that it becomes easier to turn when mowing straight ahead on a flat ground.
The position regulation biasing mechanism 110 does not have to be two tension coil springs 112 as in the present embodiment, and may be one tension coil spring 112 that pulls the rear central portion of the upper frame 30 toward the rear support frame 13 side. good. Also, leaf springs that press both sides of the upper frame 30 may be used instead of the tension coil springs 112, but if the tension coil springs 112 are used, the urging force can be easily adjusted. Furthermore, a gas spring may be used instead of the tension coil spring 112, but if the tension coil spring 112 is used, the position regulation biasing mechanism 110 can be configured at low cost.
The driving source of the mower main body 40 is not limited to the engine 41, and may be a motor. The cutting blade 42 is not limited to a tipped saw, and may be a nylon cutter or the like.
Furthermore, the side stand 22 may be used as a center stand or the like.

1 Push-type mower 10 Lower frame as lower structure 11 Wheel support frame 12 Center support frame 13 Rear support frame 21 Wheel 28 Support projection 30 Upper frame as upper structure 40 Mower body 41 Engine as drive source 42 Cutting blade 51 Handle 52 Handle shaft as sliding member 53 Guide member 56 Set screw 60 Position adjustment mechanism for handle position 70 Thrust bearing as rotation support mechanism 71 Housing washer as lower washer 73 Shaft washer as upper washer 80 Hinge as an undulating support mechanism 90 Compression coil spring as a load supporting and biasing means 100 Support biasing force adjusting means 101 Sliding guide member 110 Position regulation biasing mechanism 112 Extension coil spring 120 Locking mechanism 121 Main body 122 First locking member 123 Lower frame locking member as second locking member 124 Moving mechanism 125 Case 126 Operation knob 130 Cutoff switch 131 Switch body 134 Contact member 136 Electric circuit 150 Insulating member 152 String as operating member Element

Claims (6)

A lower structure that rotatably supports wheels, an upper structure that supports a mower body and a handle, a rotary support mechanism that rotatably supports the upper structure and the lower structure, and the upper structure. a hoisting support mechanism that supports the rotating support mechanism so that it can be raised and lowered in the vertical direction; A load supporting and urging means that bears the load applied to the body and reduces the lifting operation force of the handle, and a load supporting and urging means that is stretched between the upper structure and the lower structure and pushes the upper structure against the lower structure. and a position regulating biasing mechanism that biases the mower back to a predetermined position. 2. The push type mower according to claim 1, wherein said load supporting and urging means comprises a compression coil spring, and is provided with support and urging force adjusting means for adjusting the urging force of said compression coil spring. 3. The push mower according to claim 2, wherein the support biasing force adjusting means includes a slide guide member provided on the rotation support mechanism, and the end portion of the compression coil spring on the rotation support mechanism side is slidable. A hand-push mower configured such that it is slidably engaged with a motion guide member and the end of the compression coil spring on the side of the upper structure is in contact with the upper structure so as to be able to come into contact with and separate from the upper structure. 4. The push mower according to any one of claims 1 to 3, wherein said two wheels are provided on said lower structure and are arranged in series in the traveling direction of said mower. 4. The push mower according to any one of claims 1 to 3, wherein a guide member attached to said upper structure, and a sliding member to which said handle is attached and slidably provided on said guide member. and a position adjusting mechanism capable of adjusting an engagement position between the guide member and the sliding member, wherein the attachment position of the handle to the upper structure can be changed. 4. The push mower according to any one of claims 1 to 3, further comprising a cutoff switch for stopping the driving of the mower main body in an emergency, the cutoff switch acting as a stop switch of the drive source of the mower main body. A switch body provided in the middle of the electric circuit having a connected electrical circuit, a contact that is normally biased in the closing direction and can be contacted and separated, and a switch body that can be attached and detached between the contact and the contact of the switch body. A push mower having a releasably inserted insulating member and an operating member attached to said insulating member.

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