JP2014103913A - Hand-pushed mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-pushed mower which can efficiently perform mowing work of weed growing on the irregular ground.SOLUTION: A hand-pushed mower includes a frame 100 having wheels 110, a mowing blade drive mechanism 200 supported by the frame 100, a handle 120 attached so as to extend backward from the frame 100, for being held by an operator. The mowing blade drive mechanism 200 includes a power source 220, a support tube 210 having the power source 220 connected to the rear end thereof, a mowing blade 300 supported by the tip end of the support tube 210 and rotated by the power of the power source 220. The mowing blade drive mechanism 200 is supported by the frame 100 through a suspension mechanism 130 in such an inclined posture that the tip end of the support tube 210 is located lower than the rear end thereof.

Description

  The present invention relates to a hand-held mower.

  There exists a thing of patent document 1 as this kind of hand-held type mower. This hand-held mower has a frame with a pair of left and right wheels, a handle that is provided to extend rearward at the top of the frame, and an operator can hold with both hands, and a support tube in front of the frame. And a cutting blade supported through the blade. The cutting blade is linked to a transmission shaft inserted into the support tube, and is rotated by rotating the transmission shaft by an engine connected to the rear end portion of the support tube. The pair of wheels are arranged so as to come into contact with each other in the vicinity of a perpendicular line passing from the center of gravity of the mower in a side view. The operator can swing the whole mowing machine around the ground contact point of a pair of wheels by operating the handle up and down to position the mowing blade at a certain height with respect to the ground or to lift it largely from the ground. it can.

  The mowing operation can be performed by advancing the entire mowing machine by hand while maintaining the rotating cutting blade at a certain height from the ground. It is said that this type of hand-held mower does not require the operator to support its weight and requires less labor.

  However, the mowing machine has the following problems because the posture of the support tube with respect to the frame and the position of the cutting blade are fixed.

  That is, many of the fields have irregularities on the ground, but when mowing weeds that grow on such uneven surfaces, when this mower is pushed by hand, the entire mowing machine moves up and down along the irregularities, The vertical movement of the cutting blade that occurs at that time does not correspond to the unevenness of the ground, and the cutting blade frequently contacts the ground, and each time the cutting blade splashes the soil and pebbles on the ground, or the rotation of the cutting blade decelerates However, the work is very poor and there are safety issues.

JP 2003-289710 A

  The present invention has been conceived under the circumstances described above, and it is a main problem to provide a hand-held mower capable of efficiently performing mowing work of weeds that grow on uneven ground. To do.

  A hand-held mower according to the present invention includes a frame including wheels, a cutting blade driving mechanism supported by the frame, and a handle that is provided to extend rearward from the frame and is gripped by an operator. The mowing blade driving mechanism includes a power source, a support tube connected to the rear end of the power source, and a tip of the support tube, and is rotated by the power of the power source. The cutting blade drive mechanism is supported by the frame via a suspension mechanism in a posture in which the support tube is inclined with respect to the rear end portion so that the tip end portion is lower. It is characterized by being.

  In a preferred embodiment, the suspension mechanism is configured by interposing an elastic member between the cutting blade driving mechanism and the frame above the pair of wheels.

  In a preferred embodiment, the elastic member includes a first elastic member located on the front side and a second elastic member located on the rear side, and the first elastic member and the second elastic member. The elastic modulus of any one of the members is lower than the elastic modulus of any other member.

  In a preferred embodiment, the cutting blade driving mechanism can select a turning position around an axis in the vertical direction with respect to the frame.

  In a preferred embodiment, the cutting blade drive mechanism includes an angle adjustment mechanism that can change an angle orientation of the cutting blade supported with respect to the support tube so as to be swingable about a lateral axis with respect to the support tube. I have.

  In a preferred embodiment, the angle adjusting mechanism is configured such that the support tube is combined with a first portion on the base end side and a distal end side combined with the first portion so as to be relatively movable in the axial direction of the support tube. A flexible transmission shaft that transmits the rotational output of the power source to the cutting blade, and the transmission shaft is inserted into the support tube, and at least from the tip of the second portion The extending portion is inserted into a flexible sheath member, and the cutting blade is inserted into the second portion via the stay diagonally forward and downward with respect to the tip of the second portion. The angled posture of the cutting blade is changed by moving the second portion relative to the first portion so as to be swingable about a horizontal axis.

  In a preferred embodiment, the second part is always urged forward with respect to the first part, and a control lever provided on the first part is rotated by a cable connected to the second part. By being pulled and drawn out, the first portion is moved relative to the first portion.

  In a preferred embodiment, the cutting blade is a cutting blade main body and a grounding member that is positioned below the cutting blade main body and is relatively rotatable with respect to the cutting blade main body about the rotation axis of the cutting blade main body. And.

  In a hand-held mower having the above-described configuration, a cutting blade drive mechanism including a power source, a support tube connected to the rear end of the power source, and a cutting blade supported at the tip of the support tube is a suspension mechanism. When weeding the weeds that grow on the uneven ground by pushing this mower, the frame moves up and down along the unevenness, but this vertical movement is the cutting blade drive mechanism Therefore, the positional relationship of the cutting blade with respect to the ground can always be maintained properly, and the power source is protected from the impact caused by vibration.

It is the figure which showed one Embodiment of the hand-held mower concerning this invention, and looked at the hand-held mower from the side. It is the figure which looked at the push-type mower shown in FIG. 1 from back. It is a partial expanded longitudinal cross-sectional view of the hand-held mower shown in FIG. It is a partial expanded side view of the hand-held type mower shown in FIG. It is a perspective view which shows a cutting blade. It is a top view of the cutting blade shown in FIG. It is a figure corresponded in the VII-VII line cross section of FIG. 6, and also shows the attachment structure with respect to a cutting blade drive mechanism. It is sectional drawing which follows the VIII-VIII line of FIG. It is explanatory drawing of an example of the attachment method of a cord-shaped cutting member (nylon cord). It is the elements on larger scale of the hand-held type mower shown in FIG. It is sectional drawing which follows the XI-XI line of FIG. It is sectional drawing which follows the XII-XII line | wire of FIG. It is sectional drawing which follows the XIII-XIII line | wire of FIG. It is sectional drawing which follows the XIV-XIV line | wire of FIG. It is sectional drawing which follows the XV-XV line | wire of FIG. It is the XVI-XVI arrow directional view of FIG. It is a partial side view which shows an example of the use condition of the hand-held type mower shown in FIG. It is a partial side view which shows an example of the use condition of the hand-held type mower shown in FIG. It is a partial side view which shows an example of the use condition of the hand-held type mower shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 4 show an embodiment of a hand-held mower 1A of the present invention. This hand-held mower 1 </ b> A is provided to extend from the frame 100 having a pair of left and right wheels 110, a cutting blade drive mechanism 200 supported by the frame 100, and rearward from the frame 100, so that an operator can hold it. Handle 120 and a suspension mechanism 130 interposed between the frame 100 and the cutting blade drive mechanism 200.

  The frame 100 includes a pair of left and right leg portions 141 extending in the vertical direction, a cross frame portion 142 connecting the upper ends of the leg portions 141, and a pair of left and right bar-like support portions that are fixed to the cross frame portion 142 and extend in the front-rear direction. 143. A handle connecting member 144 is provided at the rear ends of the pair of left and right bar-shaped support portions 143. Wheels 110 are attached to the lower ends of the pair of left and right legs 141, respectively, that can rotate about the left-right axis.

  The handle 120 includes a rod member 121 extending obliquely rearward and upward from the handle connecting member 144, a substantially U-shaped member 122 attached to the rear end portion of the rod member 121, and both ends of the substantially U-shaped member 122. The handle grip 123 is provided so as to extend rearward and can be gripped by the operator with left and right hands. The handle 120 is not limited to such a configuration, and may be any configuration as long as the operator can hold the handle 120 with the left and right hands.

  The cutting blade drive mechanism 200 includes a support tube 210, a power source 220 connected to the rear end of the support tube 210, and a cutting blade 300 that is supported at the tip of the support tube 210 and rotated by the power of the power source 220. .

  The support tube 210 includes a first portion 211 on the base end side integrated with the clutch housing 230 of the power source 220, and is inserted into the distal end side of the first portion 211 so as to be axial with respect to the first portion 211. It is divided into a second portion 212 on the distal end side that is relatively movable. As shown in FIG. 3, the clutch housing 230 includes a first output shaft 233 having a clutch drum 231 on the proximal end side and a gear 232 on the distal end side so as to be rotatable via a bearing 234. A second output shaft 235 provided with a gear 236 that meshes with the gear 232 on the end side is incorporated through a bearing 237 so as to be rotatable. A combination 240 of a sheath member 241 and a transmission shaft 242 that is rotatably inserted into the sheath member 241 is inserted into the support tube 210, and the distal end side of the combination 240 is supported by the support tube 210. Further extending from the tip of the tube 210 (see FIG. 4). The base end of the sheath member 241 is locked to the first portion 211 of the support tube 210 so as not to move in the axial direction. The base end of the transmission shaft 242 is an odd-shaped end, and is fitted to a socket provided on the second output shaft 235 so that relative rotation is impossible. The sheath member 241 and the transmission shaft 242 have flexibility at least in a portion extending from the distal end of the support tube 210.

  As the power source 220, for example, a two-cycle gasoline engine is used. The rotational output of the power source 220 is transmitted to the transmission shaft 242 via the clutch drum 231 via the first output shaft 233 and the second output shaft 235 described above, and the transmission shaft 242 is rotated.

  As shown in FIG. 4, a stay 213 that is inclined downward and extends forward is integrally provided at the distal end of the second portion 212 of the support tube 210. A blade support member 250 is attached so as to be swingable about a lateral axis 214. As clearly shown in FIG. 7, a cutting blade mounting shaft 251 is supported on the cutting blade support member 250 via a bearing 252 so as to be rotatable. The cutting blade support member 250 is connected to the tip of a sheath member 241, and the tip of the transmission shaft 242 formed in a deformed shape is fitted to a socket provided on the cutting blade mounting shaft 251 so that relative rotation is impossible. Yes. The cutting blade 300 is mounted on the cutting blade mounting shaft 251. Thereby, the rotation of the transmission shaft 242 is transmitted as the rotation of the cutting blade 300.

  In this embodiment, the cutting blade 300 is a so-called cord type, as shown in FIGS. 5 to 7, and a holding member 310 that is attached to the cutting blade attachment shaft 251 and rotated, and the holding member 310. A plurality of cord-like cutting members 40 whose proximal end is held and whose distal end extends radially outward of the holding member 310, and the rotation axis of the holding member 310 below the holding member 310. And a grounding member 350 supported so as to be rotatable relative to the center. As the cord-like cutting member 40, as shown well in FIG. 8, a commercially available nylon cord 40a having a large diameter portion 40b at the proximal end and a thickness of about 3 mm and a predetermined length can be used.

  As clearly shown in FIG. 7, the holding member 310 has a horizontal disk-shaped mounting base 311, an outer peripheral portion of the mounting base 311, an upper surface continuous with the upper surface of the mounting base 311, and the mounting base 311. A thick annular portion 312 formed thicker than the thickness and a flange portion 313 extending horizontally from the lower surface of the thick annular portion 312 and having a constant outer diameter are formed of, for example, resin. .

  In the thick annular portion 312, a cord insertion space 314 having a rectangular cross section extending in a range of a central angle of approximately 90 ° along the circumferential direction in which the thick annular portion 312 extends is opposed to the diameter direction of the holding member 310. These cord insertion spaces 314 are formed at two locations, one end of which is closed and the other end is opened to the outer peripheral surface of the thick annular portion 312. Four cord connecting portions 316a, 316b, 316c, and 316d are formed at equal intervals on the ceiling wall 315 of the cord insertion space 314. As shown in FIG. 8, each cord connecting portion 316a, 316b, 316c, 316d can be inserted with a general portion of the nylon cord 40a, and has a hole that cannot be inserted through the large-diameter portion 40b. It is formed by providing the ceiling wall 315 in a penetrating manner. Further, around the exit of the cord insertion space 314, a looping portion 317 for changing the direction of the tip end side of the nylon cord 40 a inserted through the cord insertion space 314 to extend outward in the radial direction of the holding member 310. Is provided. In the present embodiment, as shown in FIG. 7, the hanging portion 317 is a screw arranged so as to span between a part of the ceiling wall 315 of the thick annular portion 312 and the flange portion 313. It is formed by interposing a cylindrical collar 319 having a predetermined outer diameter so as to be fitted to 318.

  As shown in FIG. 7, the grounding member 350 is radially outward from the inner cylinder part 351, the outer cylinder part 352, the annular bottom plate part 353 that connects these lower parts, and the lower end of the outer cylinder part 352. The bottom surface of the annular bottom plate portion 353 and the bottom surface of the flange portion 354 are convexly curved continuously in cross section. This ground member 350 is formed of, for example, resin. The grounding member 350 is attached to the cutting blade mounting shaft 251 or the holding member 310 by interposing a bearing 356 between the bearing receiver 355 integral with the cutting blade mounting shaft 251 or the holding member 310 and the inner cylindrical portion 351. On the other hand, it is rotatably supported.

  In the cutting blade 300 of the present embodiment, two nylon cords 40a are extended from the same circumferential position of the holding member 310 as follows.

  Of the cord connecting portions 316a, 316b, 316c, and 316d provided at the four locations along each cord insertion space 314 in the thick annular portion 312, the first cord connecting portion 316a and the second cord are arranged in order from the hooking portion 317. The connecting portion 316b, the third cord connecting portion 316c and the fourth cord connecting portion 316d are used, and the two nylon cords 40a are connected to the third and fourth cord connecting portions 316c and 316d as shown in FIG. Then, the cord is passed through the cord insertion space 314, hung around the hung portion 317, and pulled out in the radial direction of the holding member 310. As a result, the two nylon cords 40 a are hung on the same hung portion 317, and are extended radially outward from the same circumferential position of the holding member 310. The length of the nylon cord 40a is such that, for example, when the base end is connected to the fourth cord connecting portion 316d, the distal end of the nylon cord 40a extends in the radial direction of the holding member 310 and the flange portion 313 is extended. It is set so as to protrude about 30 to 60 mm from the outer edge.

  When the mowing operation is performed for a certain period of time using the mowing blade 300 as described later, the tip of the nylon cord 40a is worn, and the length extending from the flange portion 313 gradually decreases. In that case, the nylon cord 40a connected to the third cord connecting portion 316c is connected again to the second cord connecting portion 316b, and the nylon cord 40a connected to the fourth cord connecting portion 316d is connected to the third cord connecting portion 316d. Reconnect to part 316c. Thereby, the extension length from the flange part 313 of the nylon cord 40a can be revived by the length corresponding to the distance between the adjacent cord connecting parts. Thus, when the tips of the two nylon cords 40a connected to the second and third cord connecting portions 316b and 316c are worn and shortened again, the first and second cord connecting portions 316a and 316b are further connected to each other. Just reconnect.

  The configuration of the cutting blade 300 is merely an example, and any cutting blade that can be used in a mowing machine such as a general nylon cord type cutting blade or a super steel tip blade may be adopted. 1, 2, and 4, reference numeral 700 indicates a scattering prevention cover attached to the cutting blade support member 250 in order to prevent weeds cut by the cutting blade 300 from scattering backward. Yes. The scattering prevention cover 700 is omitted in FIGS. 5 to 9 in order to facilitate understanding of the configuration of the cutting blade 300.

  In the present embodiment, an angle adjustment mechanism 280 capable of changing the inclination angle of the cutting blade 300 with respect to the support tube 210 is configured as follows.

  As shown in FIG. 4, the second portion 212 of the support tube 210 is inserted into the second portion 212 between the stopper 215 fitted on the second portion 212 and the distal end portion of the first portion 211. The compression coil spring 216 interposed between the first portion 211 and the first portion 211 is biased toward the distal end. Further, the cable 218 connected to the second portion 212 can be pulled and extended by an operation lever 217 attached to the first portion 211 (see FIGS. 1 and 3). Accordingly, when the operating lever 217 is operated to pull the cable 218, the second portion 212 is moved rearward while compressing and compressing the compression coil spring 216 according to the pulling amount, and the support tube 210 is shortened. Then, the length of the portion extending from the tip of the support tube 210 of the combination 240 of the sheath member 241 and the transmission shaft 242 is increased, and accordingly, the cutting blade support member 250 or the cutting blade 300 is attached to the lateral shaft 214. Oscillates in the direction P in FIG. On the contrary, when the operation lever 217 is operated and the cable 218 is extended, the second portion 212 is moved forward by the elastic force of the compression coil spring 216 according to the supply amount, and the support tube 210 is extended. Then, the length of the portion extending from the distal end of the support tube 210 of the combination 240 of the sheath member 241 and the transmission shaft 242 is shortened, and accordingly, the cutting blade support member 250 or the cutting blade 300 is attached to the lateral shaft 214. Oscillates in the Q direction in FIG.

  As shown in FIGS. 1 and 10, the cutting blade drive mechanism 200 having the above-described configuration is supported by the frame 100 via the suspension mechanism 130 in a basic posture in which the support tube 210 is inclined so that the distal end thereof is at the lower side. As shown, a bracket 260 is provided below the clutch housing 230.

  The suspension mechanism 130 is configured by interposing an elastic member 150 between a horizontal plate-like sprung member 270 to which the bracket 260 is connected and the pair of left and right bar-like support portions 143 in the frame 100. The elastic member 150 includes a pair of left and right first elastic members 160 located on the front side, and a second elastic member 170 located on the rear side.

  As shown in FIGS. 11 and 12, each first elastic member 160 is configured by inserting a rubber block 160 a between a rod-like support member 143 and a sprung member 270. The rubber block 160a is connected to the upper and lower clamping plates 161a and 161b from which the screw shafts 161 are respectively projected so as to be sandwiched between them by adhesion or the like. The rubber block 160a supports the screw shaft 161 projecting from the upper clamping plate 161a in the hole 163 provided in the sprung member 270, and supports the screw shaft 161 projecting from the lower clamping plate 161b in a rod shape. By inserting the nuts 164 into the holes 163 provided in the member 143 and screwing the nuts 164 into the respective screw shafts 161, the rod-like support member 143 and the sprung member 270 are detachable from each other. It is arranged in the appearance. In this configuration, when a vertical compression force acts between the rod-shaped support member 143 and the sprung member 270, the rubber block 160 a is elastically compressed and deformed, and the distance between the rod-shaped support member 143 and the sprung member 270. Shrinks.

  As shown in FIGS. 11 and 13, each second elastic member 170 spans a shaft 171 extending vertically between the rod-like support member 143 and the sprung member 270, and the rod-like support member 143 and the sprung A compression coil spring 170a is inserted into the shaft 171 between the member 270 and the member 270. The elastic modulus of the compression coil spring 170a is set to be relatively lower than the elastic modulus of the rubber member 160a as the first elastic member 160 described above. The rod-like support member 143 is provided with a seat portion 172 for stably receiving the lower end of the compression coil spring 170a. The shaft 171 is inserted from below into a hole 163 provided in the rod-shaped support member 143 and the sprung member 270, and a nut 165 is screwed into the male screw portion at the tip of the shaft 171, whereby the rod-shaped support member 143 and the spring The upper member 270 is stretched between them so that it cannot be detached. In this configuration, when a vertical compression force acts between the rod-shaped support member 143 and the sprung member 270, the compression coil spring 170a is elastically compressed and deformed, and the distance between the rod-shaped support member 143 and the sprung member 270 is increased. Shrink. As described above, in this embodiment, the elastic modulus of the second elastic member 170 on the rear side is set lower than that of the first elastic member 160 on the front side. When an external force is applied, there is a tendency that the first elastic member 160 and the vicinity of the first elastic member 160 are pivoted elastically with respect to the frame 100 in a seesaw shape. In this embodiment, the elastic modulus of the second elastic member 170 on the rear side is set lower than that of the first elastic member 160 on the front side. However, the present invention is not limited to this, and the second elastic member on the rear side is not limited thereto. Of course, the elastic modulus of the first elastic member 160 on the front side may be set lower than that of 170, or the elastic moduli of both may be equal.

  In the present embodiment, the cutting blade driving mechanism 200 is further configured to be able to select a turning position with respect to the frame 100 around the axis 291 in the vertical direction.

  As clearly shown in FIG. 14, the cutting blade driving mechanism 200 includes a bracket 260 integral with the cutting blade driving mechanism 200, and is connected to the sprung member 270 so as to be rotatable about a vertical axis 291. It can be turned around the shaft 291. In addition, as shown in FIG. 15, the bracket 260 is provided with a lock pin 292 that can be moved up and down while being constantly urged downward by a spring 293. A plurality of locking holes 294 with which the lock pins 292 can be engaged are provided. For example, as shown in FIG. 16, the locking holes 294 are provided at three positions for each 90 ° central angle about the shaft 291. By selecting the locking hole 294 with which the lock pin 292 is engaged, the cutting blade drive mechanism 200 has a normal state in which the support tube 210 extends forward, a state in which the support tube 210 is turned 90 ° to the right from the normal state, A state in which the vehicle is turned 90 ° to the left from the normal state can be taken. For such selection of the turning position, the lock pin 292 is pulled up and removed from the engaging hole 294 engaged so far, and the entire cutting blade drive mechanism 200 is turned in either the left or right direction. When the lock pin 292 reaches the position corresponding to the other locking hole 294, the locking pin 292 automatically engages with the locking hole 294 due to the elasticity of the spring 293, and the position of the cutting blade drive mechanism 200 after turning is the same. Fixed.

  Next, the mowing work method by the hand-held mower 1A having the above configuration will be described.

  When the power source 220 is activated and a throttle lever (not shown) provided on the handle 120 or the like is operated to increase the rotational speed of the power source 220, the rotational output of the power source 220 is transmitted to the transmission shaft 242 as described above. Is transmitted to the cutting blade 300, and the cutting blade 300 is rotated. The number of rotations of the cutting blade 300 can be increased to about 6000 rpm, for example.

  In a normal state where mowing the flat ground, the turning position of the cutting blade drive mechanism 200 is set to a position where the support tube 210 extends forward with respect to the frame 100. By operating the operation lever 217, for example, FIG. As shown, the angle of the cutting blade 300 with respect to the support tube 210 is adjusted so that the cutting blade 300 is parallel to the ground. In addition, since the cutting blade 300 in this embodiment is provided with the grounding member 350, it is desirable to adjust so that the cutting blade 300 may be parallel to the ground in a state where the grounding member 350 is grounded. .

  Since the hand-operated mower 1 </ b> A includes a pair of left and right wheels 110, operations such as advancing in a hand-operated manner and swinging the support tube 210 to the left and right are possible. When the cutting blade 300 is moved along the ground in this manner, the cutting target such as weeds is prevented from entering further inward in the radial direction by the flange portion 313, and the lateral side by the nylon cord 40a that turns at high speed. It is severed from the direction and cut off. For example, when the outer diameter of the flange portion 313 is 300 mm, the turning speed of the nylon cord 40a near the outer periphery of the flange portion 313 reaches 300 km / h or more, and the weed cutting effect by the nylon cord 40a is outstanding. .

  Moreover, in the cutting blade 300 in this embodiment, there are two nylon cords 40a extending from the same portion of the holding member 310, and these two nylon cords 40a simultaneously collide with a cutting target such as weeds at high speed. Therefore, the impact force received by the object to be cut at that time is twice that when a single nylon cord 40a collides. Therefore, weeds having a relatively thick stem, weeds that have become dry and hardened, and the like can be easily cut.

  Further, the cutting blade 300 according to the present embodiment includes a grounding member 350 that can rotate relative to the holding member 310 below the holding member 310, and the grounding member 350 is driven to rotate from the power source 220. Since the force does not act, the holding member 310 or the nylon cord 40a can be rotated while the grounding member 350 is grounded without rotating. Moreover, since the lower surface of the grounding member 350 is curved smoothly, it can easily slide relative to the ground while being grounded. This means that the mowing operation can be performed while moving the cutting blade 300 along the ground while supporting the weight of the support tube 210 or the cutting blade 300 on the ground via the grounding member 350.

  Furthermore, in the hand-held mower 1 </ b> A of the present embodiment, the cutting blade driving mechanism 200 is supported on the frame 100 via the suspension mechanism 130. When this hand-held mower 1 </ b> A travels on uneven ground, the frame 100 receives vertical vibration from the ground, but this vibration is not directly transmitted to the cutting blade drive mechanism 200. Therefore, the operation of the power source 220 composed of a two-cycle gasoline engine is stabilized and the power source 220 is protected from impact. Further, as described above, the cutting blade drive mechanism 200 can elastically swing around the suspension mechanism 130, more specifically, the vicinity of the first elastic member 160 having a relatively large elastic modulus. Therefore, even if the frame 100 moves up and down via the wheel 110 due to unevenness of the ground, the up and down movement is not directly transmitted as the up and down movement of the cutting blade 300, and the cutting blade 300 or the grounding member 350 is The state of being properly grounded to the ground corresponding to these positions is maintained. Further, even if there is a raised portion on the ground in the traveling direction of the hand-held mower 1A, the cutting blade driving mechanism 200 swings and the cutting blade 300 or the grounding member 350 follows the raised portion. do.

  For this reason, the hand-held mower 1A of the present embodiment can perform mowing work on uneven surfaces without inconvenience.

  Furthermore, the hand-held mower 1 </ b> A of the present embodiment can change the angle of the cutting blade 300 with respect to the support tube 210 and can change the turning position of the cutting blade drive mechanism 200 with respect to the frame 100. By utilizing such a function, for example, grass cutting work on a slope such as a bank can be performed as follows.

  When mowing the slope of the bank is performed on the flat land below the bank with the push-type mower 1A according to the present embodiment, as shown in FIG. 18, the cutting blade 300 is arranged such that the front part is higher than the rear part. Work while tilting and moving the cutting blade 300 back and forth in the width direction of the bank within a predetermined range or swinging the support tube 210 left and right while making the cutting blade 300 parallel or close to the slope. I do. When the mowing of the area is finished, the hand-held mower 1A is moved along the bank, the mowing of the adjacent area is performed in the same manner, and this is repeated thereafter. Alternatively, similarly, the cutting blade 300 is tilted so that the front portion is higher than the rear portion, while the cutting blade driving mechanism 200 is turned to the left or right by 90 ° with respect to the frame 100, and the support tube It is also possible to perform a combination of methods in which the work is performed by moving the hand-held mower 1A along the bank while 210 is directed in the width direction of the bank.

  When mowing the slope of the bank by placing the hand-held mower 1A according to the present embodiment on the bank, as shown in FIG. 19, the cutting blade 300 has a front portion with respect to the rear portion, as shown in FIG. The cutting blade 300 is moved back and forth in the width direction of the bank within a predetermined range, or the support tube 210 is moved left and right while tilting so that the cutting blade 300 is in parallel or close to the slope. Work while shaking. When the mowing of the area is finished, the hand-held mower 1A is moved along the bank, the mowing of the adjacent area is performed in the same manner, and this is repeated thereafter. Alternatively, similarly, the cutting blade 300 is inclined so that the front portion thereof is lower than the rear portion, while the cutting blade driving mechanism 200 is turned to the left or right by 90 ° with respect to the frame, and the support tube 210. It is also possible to carry out a combination of methods in which the work is performed by moving the hand-held mower 1A along the bank while turning in the width direction of the bank.

  For this reason, the hand-held mower 1A according to the present embodiment is also convenient for performing mowing work on slopes.

  Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are included in the present invention.

1A Push-type mower 100 Frame 110 Wheel 120 Handle 130 Suspension mechanism 150 Elastic member 200 Cutting blade drive mechanism 210 Support tube 211 First portion 212 Second portion 213 Stay 214 Lateral shaft 217 Operation lever 218 Cable 220 Power source 241 Sheath member 242 Transmission shaft 300 Cutting blade 350 Grounding member

Claims (8)

A hand-operated mower having a frame including wheels, a cutting blade driving mechanism supported by the frame, and a handle provided so as to extend rearward from the frame and gripped by an operator,
The mowing blade drive mechanism includes a power source, a support tube connected to the rear end of the power source, and a mowing blade supported by the tip of the support tube and rotated by the power of the power source. And
The cutting blade drive mechanism is supported by the frame via a suspension mechanism in a posture in which the support tube is inclined so that the tip end is lower than the rear end portion. Mowing machine.   The hand-operated mower according to claim 1, wherein the suspension mechanism is configured by interposing an elastic member between the cutting blade driving mechanism and the frame above the pair of wheels.   The elastic member includes a first elastic member located on the front side and a second elastic member located on the rear side, and either one of the first elastic member and the second elastic member is elastic. The hand-held mower according to claim 2, wherein the rate is lower than the other elastic modulus.   The hand-driven mower according to any one of claims 1 to 3, wherein the mowing blade drive mechanism is capable of selecting a turning position about a vertical axis with respect to the frame.   The said cutting blade drive mechanism is provided with the angle adjustment mechanism which can change the angle attitude | position with respect to the said support tube of the said cutting blade supported so that rocking | fluctuation centering on the horizontal direction axis | shaft was carried out with respect to the said support tube. A hand-held mower according to any one of the above. The angle adjustment mechanism is
The support tube is divided into a first portion on the proximal end side and a second portion on the distal end side combined with the first portion so as to be relatively movable in the axial direction of the support tube,
A flexible transmission shaft that transmits the rotational output of the power source to the cutting blade and the transmission shaft are inserted into the support tube, and at least a portion extending from the tip of the second portion is flexible. And having a sheath member, and
The cutting blade is supported by the second portion via a stay so as to be swingable about the lateral axis at an obliquely forward and downward position with respect to the tip of the second portion,
The hand-held grass mower according to claim 5, wherein the angular posture of the cutting blade is changed by moving the second portion relative to the first portion.   The second part is always urged forward with respect to the first part, and a cable connected to the second part is pulled and pulled out by rotating an operation lever provided in the first part. The hand-held mower according to claim 6, which is moved relative to the first part.   The cutting blade includes a cutting blade main body and a grounding member that is positioned below the cutting blade main body and is rotatable relative to the cutting blade main body about the rotation axis of the cutting blade main body. The hand-held mower according to any one of 1 to 7.

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