JP5187205B2 - Lawn mower - Google Patents

Description

  The present invention relates to a lawn mower that rotates and discharges a collector that houses lawn grass cut by a mower.

Japanese Patent Application Laid-Open No. 2004-151867 describes a technique for providing an unlock lever for unlocking the collector working position and an operation lever for rotating the collector.
Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique for turning the collector working position on and off and rotating the collector with a single operation lever.

JP 2006-6207 A Japanese Patent No. 4193938

In Patent Document 1, the configuration in which the operation of rotating the collector and the operation of unlocking the storage position of the collector are separately performed are both complicated in configuration and operation.
In Patent Document 2, since the lock on / off operation and the collector rotation operation are continuously performed in the same direction, it is difficult to distinguish between the lock on / off operation and the collector rotation operation. .

  According to the first aspect of the present invention, the mower 1, the collector rotating shaft 24 provided at the rear portion of the vehicle body 2, the working position for rotating around the collector rotating shaft 24 and receiving the turf grass, and discharging the turf grass out of the machine. A collector 9 whose posture can be changed to a discharge position, a turning operation lever 30 for turning the collector 9 around the collector turning shaft 24, and turning of the collector 9 around the collector turning shaft 24. Alternatively, in a lawn mower provided with a lock hook 48 to be released and a lock mechanism 40 having a lock pin 50, the rotation operation lever 30 is provided so as to be operable in the longitudinal direction. The lock pin 50 is switched to the unlocked position where the lock pin 50 can be detached from the lock hook 48 by the pulling operation in the longitudinal direction of the lever, and the collector 9 When the rotation lever 30 is rotated around the collector rotation shaft 24, the lock hook 48 of the lock mechanism 40 is switched to the lock standby state, and the lock hook 48 in the lock standby state by the return operation of the collector 9 to the working position. The lawn mower is characterized in that the lock pin 50 is engaged with the lock pin 50 to be in a locked state.

  The collector 9 mounted on the vehicle body 2 receives and accommodates the turfgrass harvested by the mower 1. When the collector 9 is rotated from the work position to the discharge position, the lock mechanism 40 is operated by pulling up the rotation operation lever 30 in the longitudinal direction of the lever to lock the work position of the collector 9. The collector 9 is released so that the collector 9 can be rotated around the collector rotation shaft 24.

  Then, the collector 9 can be rotated around the collector rotation shaft 24 by rotating the rotation operation lever 30 while the rotation operation lever 30 is pulled up, and the stored turf grass can be discharged to the cut ground or the like.

  The lock hook 48 of the lock mechanism 40 is switched to the lock standby state by the rotation operation of the rotation operation lever 30 described above, and the lock pin 50 is engaged by the return operation to the work position of the collector 9 to be in the lock state.

  According to the second aspect of the present invention, the protrusion 32 is provided on the rotation operation lever 30, and the lock mechanism 40 includes a lock hook 48 that can be rotated up and down around a hook shaft 47 on the vehicle body 2 side, and the lock hook 48. The lock pin 50 on the collector 9 side that engages or disengages from the link rod 59, the link rod 59 whose lower end is linked to the lock hook 48, and the support rod 41 that is linked to the upper end of the link rod 59 and swings up and down around the support shaft 41 on the vehicle body 2 side. A swing arm 51 that engages with the protrusion 32 by a swing arm main body 51 a mounted on a support shaft 41 and a lifting operation of the rotation operation lever 30 in the longitudinal direction. And an engaging lever 51b that is disengaged from the projecting portion 32 by the turning operation of the collector 9 of the turning operation lever 30, and the swing arm 51 is turned around the support shaft 41 to the lower turning side. A lawn mower according to claim 1 provided with a return spring 54 for energizing.

  By the raising operation of the rotation operation lever 30, the protrusion 32 of the rotation operation lever 30 engages with the engagement lever 51b of the swing arm 51 and swings around the support shaft 41 integrally with the swing arm body 51a. The operation is moved and linked with the lock hook 48 via the link rod 59 to move to the unlocked position. This unlocks the collector 9 and enables the collector 9 to rotate.

  Further, the protrusion 32 is detached from the engaging lever 51b by the turning operation of the turning operation lever 30 to the front side. For this reason, the lock hook 48 is moved via the swing arm 51 and the link rod 59 by the urging force of the return spring 54. Is set to the lock standby state. When the lock pin 50 approaches and comes into contact with the lock hook 48 due to the return of the collector 9 to the working position side, the lock hook 48 enters while being retracted against the return spring 54 and is engaged with the lock hook 48. And lock.

  According to a third aspect of the present invention, the engagement lever 51b is separated by a predetermined distance L, and an opening A that allows the lever flange 30a of the rotation operation lever 30 to enter is formed on the rear end side. The lawn mower according to claim 2, wherein the lawn mower is provided so as to be movable up and down with respect to the swing arm main body 51 a side that couples the combined lever 51 b to the support shaft 41 and is urged by the return spring 54 so that the rear end side faces upward.

  By pulling up the lever lever 30a from the opening A of the engagement lever 51b, the engagement lever 51b can be pulled up by the protrusion 32, and the swing arm 51 is rotated around the support shaft 41. . Next, when the turning operation lever 30 is turned, the lever collar 30a comes out of the opening A, the protrusion 32 is detached from the engaging lever 51b, and the swinging arm 51 is returned by the biasing action of the return spring 54. The lock hook 48 is set in the lock standby state.

  When the pivoting lever 30 is pivoted to return the collector 9 to the working position, the pivoting lever 30 may be pivoted back in an excessively raised state in the upper longitudinal direction. Although positioned above the engagement lever 51b, when the rotation operation lever 30 is pushed down, the engagement lever 51b is retracted in a bent state with respect to the swing arm body 51a against the return spring 54, and the rotation operation is performed. The lever 30 is in the retracted state at the initial position.

  According to the first aspect of the present invention, the locked state of the collector 9 can be released via the lock mechanism 40 by the pulling operation in the lever longitudinal direction of the turning operation lever 30, and the turning operation lever can be released in this unlocked state. Since the rotation operation is performed while holding the handle 30, it is possible to perform the lock release and the rotation operation while holding the single rotation operation lever 30 without changing the lever operation. Can be done quickly. Further, by making the operation direction of the unlocking operation different from the operation direction of the turning operation of the collector 9, it is possible to prevent the lock from being accidentally unlocked during the lawn mowing work.

  Further, when the turning operation lever 30 is turned toward the discharge position side of the collector 9, the lock hook 48 of the lock mechanism 40 is switched to the lock standby state, and the lock 9 is locked in the lock standby state by the return operation of the collector 9 to the working position. Since the lock pin 50 is engaged with the hook 48 to make it locked, it is possible to prevent forgetting to lock.

  The invention according to claim 2 achieves the effect according to claim 1, and the protrusion 32 formed on the turning operation lever 30 engages the engaging lever 51b by the pulling-up operation of the turning operation lever 30. Then, it swings around the support shaft 41 integrally with the swing arm main body 51a, and its operation is to move the lock hook 48 via the link rod 59 and move it to the unlock position. The lock can be reliably released with a simple configuration to allow the collector 9 to rotate.

  Further, the protrusion 32 is detached from the engaging lever 51b by the turning operation of the turning operation lever 30 to the front side. For this reason, the lock hook 48 via the swing arm 51 and the link rod 59 is biased by the return spring 54. , The lock pin 50 is received and engaged by the return of the collector 9 to the working position side, and the lock 9 can be locked, and the lock hook 48 can be locked or switched to the lock standby state. The unlocking operation and the like can be performed accurately, and the configuration can be simplified.

  Further, the invention according to claim 3 has the effect of the invention according to claim 2, and when the turning operation lever 30 is turned to return the collector 9 to the working position, the turning operation lever 30 is moved. When the lever 32 is turned upward in the excessively upward state, the protrusion 32 is positioned above the engagement lever 51b. However, when the rotation operation lever 30 is pushed down, the engagement lever 51b resists the return spring 54. The portion can be retracted in a bent state with respect to the swing arm main body 51a, and the rotation operation lever 30 can be reliably returned to the initial position. The return spring 54 can be provided with a biasing force for returning the swing arm 51 and a biasing force for positioning the engaging lever 51b with respect to the swing arm main body 51a, and is configured to perform a plurality of actions with a single spring. It can be simplified.

Overall side view of lawn mower Side view showing the working status of the collector Side view showing collector discharge A plan view (A) and a side view (B) of a part of the lock mechanism Side view showing part of the locking mechanism Perspective view of locking mechanism

An embodiment of the present invention will be described based on a lawn mower that cuts lawn with reference to the drawings.
In this embodiment, the front-rear direction refers to the traveling direction of the vehicle body 2 of the lawn mower equipped with the mower 1, and the left-right direction refers to the direction viewed from the front side of the vehicle body 2.

  The mower deck 3 is in the form of a mid mower mounted on the abdomen of the lawn mower body 2, and a grass outlet 5 is formed at the center rear side of the mower deck 3. The grass outlet 5 communicates with a collector 9 attached to the rear frame 8 at the rear end of the vehicle body 2 via a duct 7 between the left and right rear wheels 6 and 6.

  The vehicle body 2 includes front wheels 10 and 10, rear wheels 6 and 6, a handle 11 for steering the front wheels 10 and 10, a driver's seat 12, an engine 13, a floor 14, and the like. A power take-off shaft 15 for taking out the power of the engine 13 is provided below the floor 14 in the front-rear direction. The power of the power take-off shaft 15 is transmitted to the input shaft 17 of the mower 1 via the transmission belt 16, and is transmitted from the input shaft 17 to the blade shafts 18, 18 provided on the left and right sides of the mower deck 3. Mowing turfgrass counterclockwise around the vertical axis.

A travel transmission shaft 20 is connected to the rear portion of the power take-off shaft 15, and the rear wheels 6 and 6 are driven through a transmission case 21 and a hydraulic continuously variable transmission (HST) 22.
A collector 9 is mounted on the rear frame 8 at the rear end of the vehicle body 2 via a mounting bracket 23. The mounting bracket 11 is configured to support a collector rotation shaft 24 having a horizontal axis serving as a rotation shaft of the collector 9.

A rotating plate 25 that rotates integrally with the rotation of the rotating shaft 24 is provided around the collector rotating shaft 24.
The collector 9 is surrounded by a ventilation net N on the upper and lower surfaces, the left and right surfaces, and the rear surface of the net frame 26 that is formed in a box shape vertically and horizontally. The front surface of the collector 9 is not covered with the ventilation net N and an open portion G is formed so as to correspond to the rear surface of the rear frame 8. The opening G is configured to communicate with the duct opening at the end of the duct 17 connected to the rear frame 8.

  The blades 19 and 19 of the mower 1 cut the turf as well as generate air, and the cut turfgrass passes through the duct 7 and passes through the duct opening at the end and the opening G of the collector 9 into the collector 9. Drain and store. And the ventilation which conveyed the turf grass is exhausted from the ventilation net | network N. FIG.

  A rotation operation lever 30 for rotating the collector 9 is provided at the front part on the left and right sides of the collector 9. When the collector 9 is in a working position for receiving and accommodating the cut grass, the rotary operation lever 30 is in a vertically long posture and formed on a pair of upper and lower lever supports 31, 31 formed on the rotary plate 25. The rotation operation lever 30 is configured to be slidable in the longitudinal direction. When the operator operates the rotation operation lever 30, the operator grips the upper portion of the rotation operation lever 30 and rotates it forward. A protruding portion that protrudes in a direction intersecting with the longitudinal direction of the lever, that is, an engagement ring 32 having a diameter larger than the lever diameter in the illustrated example, is formed at the lower portion of the rotation operation lever 30.

Between the lower side of the rotation operation lever 30 and the rear frame 8, a lock mechanism 40 for restricting or releasing the rotation around the collector rotation shaft 24 is configured.
Further, the configuration of the lock mechanism 40 will be described in detail below.

  A bracket 42 for projecting a support shaft 41 to be described later is provided on the left and right sides of the rear frame 8, and a hook bolt 44 as a support shaft is provided on the outer surface of the bracket 42 so that the hook plate 43 can be rotated forward and backward. I support it. An adjustment bolt 46 is inserted into the elongated hole 45 formed in the hook plate 43 so that the front and rear angles of the hook plate 43 are adjusted and fixed to the bracket 42.

  A lock hook 48 is supported at the lower end of the hook plate 43 by a hook shaft 47 so as to be pivotable up and down, and the lock hook 48 is provided in front of the lower part of the net frame 26 of the collector 9. The collector 9 is configured to restrict (lock) the collector 9 from rotating around the collector rotation shaft 24 by being hooked onto the collector.

  A swing arm 51 is provided at the upper end of the bracket 42 so as to be rotatable up and down around the support shaft 41. The swing arm 51 includes a swing arm main body 51a directly attached to the support shaft 41 and a pair of left and right engaging levers 51b connected to the rear end of the swing arm main body 51a. The lever 51b is provided around the lever pin 53 so as to be rotatable up and down, and the engagement lever 51b is urged upward at the rear end side by a return spring 54 that connects the bracket 42 and the front side of the engagement lever 51b. The swing arm main body 51a is provided with a stopper 55 that makes contact with the lower edge of the front side of the engagement lever 51b. The swing arm main body 51a and the engagement lever 51b are integrally supported by the stopper 55 in contact with the stopper 55. It is configured to be pulled downward around the shaft 41.

  When the engagement lever 51b is positioned above the engagement ring 32 of the rotation operation lever 3 so as to sandwich the left and right sides of the rotation operation lever 30 in plan view, the engagement lever 51b is pulled up. When the engaging ring 32 as the projecting portion is engaged, the swing arm main body 51a integrated with the return spring 54 and the stopper 55 and the engaging lever 51b rotate upward around the support shaft 41 as described above. It is configured to move.

  The swing arm 51 and the lock hook 48 are linked between connection bosses 57 and 58 that are rotatably connected to a connection pin 56 on the swing arm main body 51a side and a connection pin 49 on the lock hook 48 side, respectively. The rod 59 is connected. Then, the lock hook 48 is turned up and down by turning up and down around the support shaft 41 of the swing arm 51, and this lock hook 48 is engaged with and released from the lock pin 50 formed on the net frame 26 side of the collector 9. It is configured.

  That is, the lock mechanism 40 is configured by connecting a swing arm 51 including an engagement lever 51b and a swing arm main body 51a, a link rod 59, and a lock hook 48, and locking the lock pin 50 by the lock hook 48. By releasing the lock, the rotation of the collector 2 is restricted or the restriction is released.

Next, an outline of the operation of the collector 9 will be described.
When the operator grips the upper part of the rotation operation lever 30 and pulls it upward from the initial position of the rotation operation lever 30 as the lower end of the slide, the lock mechanism 40 is activated to change the work position and posture of the collector 9. The lock is released so that the collector 9 can be rotated. Next, by rotating the upper part of the rotation operation lever 30 toward the front side with the rotation operation lever 30 pulled up, the collector 9 is rotated to the discharge position and the stored turf grass is cut. It is possible to rotate and discharge to the same. When the rotated collector 9 is rotated back to the working position and posture, it is automatically locked by the lock mechanism 40. When the operator releases the rotation operation lever 30, the rotation operation lever 30 is slid to return to the initial position.

Next, details of the operation of the lock mechanism 40 accompanying the operation of the collector 9 will be described.
When the collector 9 is rotated by disengaging the lock hook 48 engaged with the lock pin 50, the rotation operation lever 30 is pulled upward from the initial position along the lever supports 31 and 31 (FIG. 3 arrow P direction). Then, the engagement ring 32 at the lower end comes into contact with the lower end at the rear of the engagement lever 51b, and both the engagement levers 51b are pulled upward. Therefore, the swing lever 51 is rotated upward around the support shaft 41 integrally with the engagement lever 51b, and the link rod 59 is also moved upward accordingly. Then, the lock hook 48 is rotated upward around the hook shaft 47 to disengage from the lock pin 50 and can be unlocked, and the collector 9 can rotate around the collector support shaft 24. Become.

  Next, when the upper part of the rotation operation lever 30 held by the operator is rotated forward (in the direction of arrow Q in FIG. 3), the collector 9 rotates around the collector rotation shaft 24. At this time, when the open portion G on the front side of the collector 9 is rotated to a position facing the ground, the turf grass accommodated in the collector 2 can be discharged.

  When the above-described rotation operation lever 3 is rotated forward, the rotation operation lever 30 moves with the engagement ring 32, while the engagement lever 51b is configured as a pair of left and right. The lever shaft of the rotation operation lever 30 allows the retracting operation from the release portion of the opposing engagement lever 51b, and the engagement ring (projection portion) 32 is disengaged from the engagement lever 5. As soon as the engagement ring (protrusion) 32 is released from the engagement lever 51b, the engagement lever 51b and the swing arm body 51a rotate downward around the support shaft 41 by the action of the return spring 54, Accordingly, the link rod 59 is pulled downward, and the lock hook 48 returns to the lock position.

  When the collector 2 is returned from the posture of the discharge position to the posture of the work position, the upper portion of the rotation operation lever 30 is rotated backward (in the direction of arrow Q in FIG. 3). When the collector 9 is rotated around the collector rotation shaft 24 and the collector 9 is rotated to the working position, the lock hook 48 waiting at the lock position in the standby state is retracted in the unlocking direction while the lock pin 50 is retracted. Is received and brought into an engagement lock state. When the operator depresses the rotation operation lever 30, the rotation operation lever 30 slides downward and returns to the initial position.

  By the way, the lever collar portion 30a of the lever 30 can enter from the release portion of the engagement lever 51b by the return rotation operation of the rotation operation lever 30, but the lifting distance of the lever 30 is large and the lever 30 If the engagement ring (projection) 32 is still higher than the position of the engagement lever 51b even if the lever is turned back, the engagement ring (projection) 32 is positioned above the engagement lever 51b. Thus, when the engagement lever 51b is configured integrally with the swing arm main body 51a, the downward rotation around the support shaft 41 may be restricted, and the rotation operation lever 30 may not be able to move downward. However, as shown in FIG. 5, the engaging lever 51b can be bent with respect to the swing arm main body 51a by the lever pin 53, so that the turning operation lever 30 is forcibly slid downward from the X position. As a result (the Y and Z positions), the engaging lever 51b is pushed by the engaging ring (protruding portion) 32 and pivots downward around the lever pin 53 to retract, and the pivoting lever 30 returns to the initial position. The lever flange 30a is set to enter from the release portion of the engagement lever 51b while returning to the initial position.

Reference numeral 60 is a stopper for restricting the pivoting of the swing arm 51 above a certain level, and 61 is a fixed pin for maintaining the parallel posture of the engaging lever 51b.
2 and 3, the bracket 42 and the rotating plate 25 are connected by a damper 65.

  Both ends of the damper 65 are configured to be attached to a pin 66 formed on the bracket 42 and a pin 67 formed on the bracket 42. The damper 65 expands and contracts as the collector 9 rotates. When the collector 9 is in the working position, the damper 65 contracts most, and when the collector 9 rotates to the discharge position, the damper 65 expands and rotates. It is the structure which assists rotation operation. Further, by adjusting the hook plate 43 to be rotated back and forth in the region of the long hole 45 by loosening the bolt 46, the optimum engagement hook position of the collector 9 with respect to the lock pin 50 can be adjusted.

  As described above, the lock mechanism 40 includes the engagement lever 51b that is engaged by the pulling operation of the rotation operation lever 30, the swing arm body 51a that swings in conjunction with the vertical movement of the engagement lever 51b, The link rod 48 is interlocked by the swing arm body 51a, the lock hook 48 is pivotally engaged with the lock pin 50 of the collector 9 via the link via the link rod 59, the return spring 54, and the like. Then, the engaging lever 51b and the swing arm main body 51a are integrally pivoted around the support shaft 41 by pulling up the pivot operation lever 30, and the link rod 59 is lifted to pivot the lock hook 48 to the unlock position.

  When the engagement ring (projection) 40 is detached from the engagement lever 51b by the rotation operation of the rotation operation lever 30, the swing arm main body 51a, the link rod 59 and the lock hook 48 are moved from the unlocked position by the return spring 54. Return to the locked position. When the collector 9 turned to the discharge position is returned to the work position by the turning operation of the turning operation lever 30, the lock hook 48 waiting at the lock position is moved to the collector 9. The lock pin 50 is engaged to lock the collector 9 in the working position.

In the present embodiment, the engagement ring 32 is shown as the protrusion provided on the rotation operation lever 30, but other forms such as a pin member may be provided.
In this embodiment, the upper end of the return spring 54 is connected to the engaging lever 51b, and the swinging arm 51 is pivoted downward around the support shaft 41, and the engaging lever 51b swings. The arm body 51a can be swung up and down, and the function of urging the rear end side upward in the range of the stopper 55 is also used. Therefore, the structure can be simplified by providing a single return spring 54. However, the return spring may be connected to the swing arm 51 while a lock-side biasing spring for the lock hook 48 may be separately provided. The connection to the swing arm 51 may be either the swing arm main body 51a or the engaging lever 51b.

DESCRIPTION OF SYMBOLS 1 Moore 2 Car body 3 Moore deck 24 Collector rotating shaft 30 Turning operation lever 32 Engagement ring (protrusion part)
40 Locking mechanism 48 Locking hook 50 Locking pin 51 Swing arm 51a Swing arm body 51b Engaging lever 59 Link rod

Claims (3)

  The mower (1), the collector rotation shaft (24) provided at the rear of the vehicle body (2), the working position for rotating around the collector rotation shaft (24) and receiving turfgrass and discharging the turfgrass out of the machine. A collector (9) whose posture can be changed to the discharge position, a turning operation lever (30) for turning the collector (9) around the collector turning shaft (24), and a collector turning of the collector (9) In a lawn mower provided with a lock hook (48) for restricting or releasing rotation around the shaft (24) and a lock mechanism (40) having a lock pin (50), the rotation operation lever (30) is elongated. The lock mechanism (40) is configured so that the lock pin (50) is locked when the collector (9) is in the working position by pulling up the rotation lever (30) in the lever longitudinal direction. Detachable from (48) When the collector (9) is rotated about the collector rotation shaft (24) by the rotation operation lever (30), the lock hook (48) of the lock mechanism (40) is switched to the unlocking position. Is switched to the lock standby state, and the lock pin (50) is engaged with the lock hook (48) in the lock standby state by the return operation of the collector (9) to the working position, and the lock state is established. Lawn mower.   The rotating operation lever (30) is provided with a projecting portion (32), and the lock mechanism (40) includes a lock hook (48) that is rotatable up and down around a hook shaft (47) on the vehicle body (2) side, A lock pin (50) on the collector (9) side that engages with or disengages from the lock hook (48), a link rod (59) whose lower end is linked to the lock hook (48), and an upper end of the link rod (59) And a swing arm body (51) swinging up and down around the support shaft (41) on the vehicle body 2 side. The swing arm body (51) is mounted on the support shaft (41). (51a) is engaged with the protrusion (32) by a longitudinal pulling operation of the rotation operation lever (30), and the rotation operation of the collector (9) of the rotation operation lever (30) Engaging lever (5) to be released from the protrusion (32) b) and the constructed, lawn mower according to claim 1 provided support shaft swing arm (51) and (41) the return spring biasing the lower turning side around (54).   The engagement lever (51b) is formed with an opening (A) on the rear end side that allows the lever collar (30a) of the rotation operation lever (30) to enter the rear end side with a predetermined interval (L). The engaging lever (51b) is movable up and down with respect to the swing arm main body (51a) connected to the support shaft (41), and is urged by the return spring (54) so that the rear end is directed upward. The lawn mower according to 2.

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