JPH0575466B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metering device for a backpack power spreader used for spraying chemicals, fertilizers, etc. This invention relates to a metering device for a backpack power spreader that can adjust the discharge amount to .

[Conventional technology]

In the conventional metering device for backpack power spreaders, the tip of the shutter lever is inserted into a guide groove of a scale plate, and is inserted into one of the locking grooves formed at appropriate intervals in the vertical direction on the side edge of this guide groove. The degree of opening of the shutter at the outlet of the spray material is adjusted in relation to the swinging position of the shutter lever in the vertical direction, that is, the locking groove in which the shutter lever is locked. Further, the scale plate is located on the side of the backpack power spreader with its front facing substantially forward, and a scale corresponding to each locking groove is written on the scale plate.

Therefore, the operator cannot see the scale on the scale plate when carrying the power spreader on his or her back, and must move the shutter lever into the desired locking groove in order to obtain the shutter opening according to the spraying situation. Difficult to lock.

Therefore, in the metering device for the backpack power spreader disclosed in Japanese Utility Model Publication No. 62-40690, a stopper is provided to restrict the upward swinging of the shutter lever, and this stopper is inserted into a predetermined locking groove in the guide groove of the scale plate. The shutter lever is fixed in position in advance before the spraying operation, and during spraying, the upper limit swing position of the shutter lever is regulated by the stopper so that it becomes the height of the locking groove that corresponds to the shutter opening depending on the spraying situation. ing.

[Problem to be solved by the invention]

The problems with the metering device of the backpack power spreader disclosed in Utility Model Publication No. 62-40690 are as follows.

(a) The adjustable shutter lever opening becomes discontinuous and cannot be adjusted steplessly.

(b) The operator cannot see the scale position while carrying the power spreader on his or her back.

(c) As a result of the above (b), it is difficult for the operator to change the shutter lever to a desired swing position while carrying the power spreader on his or her back.

The first aspect of the invention is to make it possible to steplessly adjust the opening degree of the shutter lever in a metering device for a backpack-powered spreader in which the discharge amount of the spray material can be set without looking at the scale on the scale plate. With the goal.

The object of the invention as claimed in claim 2 is, in addition to the object of the invention as claimed in claim 1, to enable an operator to easily know the opening position of the shutter lever while carrying the power spreader on his or her back, and to move the shutter lever to a desired position. It is an object of the present invention to provide a metering device for a backpack power spreader that can be changed to a swinging position.

It is an object of the present invention to provide a metering device for a backpack power spreader that can accurately display the shutter lever opening degree.

[Means to solve the problem]

The invention will be described using reference numerals in the drawings that correspond to the embodiments.

The metering device of the backpack power spreader according to the first aspect includes a shutter 28 which is disposed at the outlet 29 of the spray material tank 24 and controls the outflow amount of the spray material 26 at the outlet 29.
, a shutter lever 44 that swings vertically on the distal end side to control the opening degree of the shutter 28, and a shutter lever 44 that has a tapered portion 88 on the base end side.
a grip 46 that is screwed onto the distal end side of the grip 46, and a tapered portion 8 that extends vertically and gradually increases in width downwardly
8 is inserted into the insertion groove 66, and this insertion groove 6
6 and a reference position locking groove 72 that opens laterally into the insertion groove 66 at the lower end of the shutter lever 4 .
4 upwardly.

In the metering device for the backpack power spreader according to claim 2, the grip 46 is connected to the tip 8 of the internal shutter lever 44.
2 is provided, and a scale 87 is provided on the transparent portion 80.

In the metering device for the backpack power spreader according to the third aspect, the spray amount display ring 84 is attached to the position of the shutter lever 44 within the transparent portion 80 so that the position in the extending direction of the shutter lever 44 can be adjusted.

[Effect]

In the invention of claim 1, when the shutter lever 44 is moved laterally from the reference position locking groove 72 to the insertion groove 66, the shutter lever 44
It moves upward due to a biasing force of 0.90. The width of the insertion groove 66 is narrower toward the top, so the grip 4
6 comes into contact with the insertion groove 66 at a height where the width of the tapered portion 88 located in the insertion groove 66 matches the width of the insertion groove 66, and is held in this swinging position. The shutter 28 is opened to an opening corresponding to the swing angle of the shutter lever 44, that is, the height of the grip 46 in the insertion groove 66.

When the grip 46 is rotated with respect to the shutter lever 44, the relative screwing position between the grip 46 and the shutter lever 44 changes, and the position of the grip 46 with respect to the shutter lever 44 in the extending direction of the shutter lever 44, that is, with respect to the extending direction of the shutter lever 44. The diameter of the tapered portion 88 of the grip 46 at a location corresponding to the position of the insertion groove 66 changes,
As a result, the height at which the tapered portion 88 of the grip 46 contacts the side edge of the insertion groove 66 in the insertion groove 66 changes.

In the invention of claim 2, the transparent portion 80 of the grip 46
The shutter lever 44 inside the handle 46 can be seen through it. Since the grip 46 protrudes forward, the operator can read the scale 8 of the transparent portion 80 by turning his/her face downward while carrying the power spreader 10 on his/her back.
7, and the shutter lever 4 for this scale 87
The location of the predetermined location 4 can be known. Scale 8
7 corresponds to a change in the position of the tapered portion 88 corresponding to the insertion groove 66 in the extending direction of the shutter lever 44. You can know the opening degree.

In the third aspect of the invention, the position of the spray amount display ring 84 with respect to the extending direction of the shutter lever 44 is adjusted so that the position of the spray amount display ring 84 relative to the transparent portion 80 of the handle 46 is a position that correctly indicates the opening degree of the shutter lever.

〔Example〕

FIG. 9 is an overall schematic diagram of the backpack power spreader 10. The backpack power spreader 10 is equipped with a blower 12 at the bottom, and the blower 12 has a fan case 14 made of resin.
and an impeller 16 disposed within the fan case 14 and driven by an engine (not shown);
It has a scroll-shaped ventilation passage 18 formed outside the impeller 16 in the radial direction. The bent pipe 20 is rotatably coupled to the fan case 14 so as to communicate with the downstream end of the ventilation passage 18, and has a discharge port 22. A jet pipe (not shown) is connected to the downstream end of the bent pipe 20. The spray material tank 24 is placed and fixed on the upper part of the fan case 14, and contains a spray material 26 such as powdered and granular fertilizers and chemicals. The shutter 28 is swingably disposed at the outlet 29 at the bottom of the spray tank 24 by manual operation, and adjusts the opening area of the outlet 29, that is, the discharge amount of the spray 26 at the outlet 29. The pressurizing passage 30 is formed in the fan case 14 , branches from the middle of the blowing passage 18 , and reaches an opening at the bottom of the spray tank 24 . The pressurizing pipe 32 extends in the vertical direction and introduces the pressurized air in the ventilation passage 18 into the space in the fan case 14 above the spray material 26 . The discharge pipe 34 made of resin is arranged inside the fan case 14 , communicates with the outlet 29 at the bottom of the spray material tank 24 at the upper end, opens near the bent pipe 20 at the lower end, and discharges the spray material 26 into the bent pipe 20 . lead in the direction

Pressurized air is generated in the air passage 18 by the rotation of the impeller 16, and this pressurized air is sent to the discharge port 22 through the air passage 18, and a part of the pressurized air flows through the pressurized pipe 32. Via backpack power spreader 10
The spray material 26 is guided to the upper part of the shutter 28.
The other part is guided to the opening at the bottom of the spray tank 24 through the pressurizing passage 30, and then entrains the spray material 26 to the discharge pipe 34. As a result, the spray material 26 is force-fed from the discharge port 22 by pressurized air.

FIG. 10 is a perspective view of the operating mechanism of the shutter 28. The support shaft 36 is integrally fixed to the shutter 28, rotatably supported at both ends by the shutter case 37 at the bottom of the spray tank 24, and exposed to the outside of the shutter case 37 at one end. The link arm 38 has three locking holes 40 in the longitudinal direction, and has a support shaft 36 at one end.
is inserted through the exposed end of the support shaft 36, and is integrally fixed to the support shaft 36 by a lock nut 42. The shutter lever 44 includes a grip 46 that is disposed on the side of the backpack power spreader 10 and is held by the operator, and a support shaft 48 that is rotatably supported on the frame of the backpack power spreader 10. It is equipped with lever arm 50
is fixed at one end to the end of the support shaft 48, and swings integrally with the support shaft 48. Two locking holes 52
are formed in line in the longitudinal direction of the lever arm 50. The intermediate rod 54 is a backpack power spreader 10.
It extends in the vertical direction between the backpack support and the main body of the backpack power spreader 10 mounted on the backpack support, and the upper end is inserted and fitted into a predetermined locking hole 40 of the link arm 38. , is prevented from coming off from the locking hole 40 by the lock pin 56, and is inserted into a predetermined locking hole 52 of the lever arm 50 at the lower end.
The lock nut 58 prevents the lock nut 58 from coming out of the locking hole 52.

The support shaft portion 48 rotates due to the swinging of the grip 46,
The lever arm 50 is swung. As a result, the intermediate rod 54 moves up and down, and the link arm 38 rotates integrally with the support shaft 36. In this way, the shutter 28 swings, the opening area of the outlet 29 of the spray material tank 24 changes, and the amount of spray material 26 to be sprayed is adjusted.

FIG. 1 is a perspective view of the operating section of the metering device. The support bracket 60 carries the power spreader 1 with its proximal end on its back.
It is fixed to the front end of the side part of the backpack frame of 0, and after protruding to the side by a predetermined amount, it protrudes forward. The scale plate 62 faces forward, and the backpack power spreader 10
The inner side edge in the left-right direction is fixed to the front end of the support bracket 60. The throttle lever groove 64 and the shutter lever groove 66 are arranged on the outside and inside of the backpack power spreader 10 in the left and right direction.
It is formed on the scale plate 62 and extends long in the vertical direction. The shaft portion 48 of the shutter lever 44 extends to the side of the backpack power spreader 10 and is rotatably supported by a support bracket 60. 48, it is bent at a substantially right angle and extends toward the front of the backpack power spreader 10. The joint between the support shaft 48 and the support bracket 60 has a spring force, and this spring force urges the tip of the swing shaft 68 outward in the left-right direction of the backpack power spreader 10. . The grip 46 is attached to the distal end side of the swing shaft portion 68, and its proximal end side is inserted into the shutter lever groove 66. The torsion coil spring 70 is fitted into the end of the support shaft 48 on the swing shaft 68 side, and has both ends locked to the support bracket 60 and the swing shaft 68, respectively.
8 is biased upward. FIG. 6 is a perspective view of the torsion coil spring 70.

FIG. 2 is a front view of the scale plate 62, and FIG. 3 is a sectional view taken along the line - in FIG. A plurality of locking grooves are formed at appropriate intervals in the vertical direction on one vertical side edge of the throttle lever groove 64, so that the throttle lever can be locked freely. On the scale plate 62, a scale (not shown) for the throttle lever is written along the side edge of the groove 64 for the throttle lever. The shutter lever groove 66 is formed so that the width becomes narrower toward the top, and the recess 72 opens laterally at the lower end of the shutter lever groove 66.
A semicircular engagement portion 74 is formed at the upper edge of the recess 72 . In the vertical direction, the lower end of the shutter lever groove 66, that is, the position of the recess 72 is as follows:
This corresponds to the fully closed position of the shutter 28.

FIG. 4 is a longitudinal sectional view of the area of the grip 46. The grip 46 includes a threaded portion 76, and the threaded portion 76 is threaded into a threaded groove 78 of the swinging shaft portion 68.
It can move forward and backward in the axial direction. A transparent cap 80 of the grip 46 is removably fitted to the distal end side of the threaded portion 76, and a distal end portion 82 of the swing shaft portion 68 is located within the transparent cap 80. At the tip 82,
A threaded groove is formed, the ring 84 is fitted onto the tip 82, and a pair of lock nuts 86, 86 are screwed onto the tip 82 to freely adjust the position of the ring 84 in the axial direction of the swing shaft 68. The ring 84 is held between both sides. The tapered portion 88 is formed at the proximal end of the threaded portion 76, and has a diameter that gradually decreases toward the proximal side. The tapered portion 88 is located at a position corresponding to the shutter lever groove 66 and the engaging portion 74 (FIG. 2) in the axial direction of the swing shaft portion 68, and the tapered portion 88 is located at a position corresponding to the shutter lever groove 66 and the engaging portion 74 (FIG. 3). The whole is located within the recess 72.

FIG. 5 is a plan view of the transparent cap 80. A scale 87 is written on the surface of the transparent cap 80,
0 to 10 are displayed.

The operation of the embodiment will be explained.

The tip side of the swinging shaft 68 is biased outward in the left-right direction of the backpack power spreader 10 by the spring force of the joint between the support shaft 48 and the swinging shaft 68, and is biased upwardly by the torsion coil spring 70. is urged to. Nigiri 46
When is in the position of the recess 72, the swing shaft portion 68 of the shutter lever 44 engages with the engaging portion 74, and at this time the shutter 28 is in a fully closed state.

Grip the grip 46 and rotate the support shaft 48 and the swing shaft 6.
When the shutter lever 44 is moved laterally from the recess 72 to the shutter lever groove 66 against the urging force in the direction of expanding the swing shaft 68 due to the joint portion with the connecting portion 8, the shutter lever 44 is moved by the torsion coil spring. Due to the biasing force of 70, the shutter lever groove 66
Move upward within. Since the width of the shutter lever groove 66 is narrower toward the top, the grip 46 has a tapered portion 88 located in the shutter lever groove 66.
comes into contact with the side edge of the shutter lever groove 66 at a height where the diameter matches the width of the shutter lever groove 66. The shutter 28 is opened to an opening corresponding to the swing angle of the shutter lever 44, that is, the height of the grip 46 in the shutter lever groove 66.

FIG. 7 shows the relationship between the change in the relative position of the swing shaft 68 and the grip 46 in the axial direction of the swing shaft 68 and the swing position of the shutter lever 44. As the grip 46 moves toward the tip of the swing shaft 68, the smaller diameter portion of the tapered portion 88 becomes the position of the shutter lever groove 66.
is allowed to swing upward, and the set opening degree of the shutter 28 can be increased. La, Lb and
Lo is the highest position of the shutter lever 44,
An intermediate position and a lowest position are shown, and correspond to fully open, half open, and fully closed shutter 28, respectively.

When the grip 46 is rotated with respect to the shutter lever 44, the relative screwing position between the grip 46 and the shutter lever 44 changes, and the position of the grip 46 with respect to the shutter lever 44 in the extending direction of the shutter lever 44, that is, with respect to the extending direction of the shutter lever 44. The diameter of the tapered portion 88 of the grip 46 at the location corresponding to the position of the shutter lever groove 66 changes, thereby causing the shutter lever groove 66 to change in diameter.
6, the height at which the tapered portion 88 of the grip 46 contacts the side edge of the shutter lever groove 66 changes. A change in the relative screwing position between the grip 46 and the shutter lever 44 in the extending direction of the shutter lever 44 is caused by a ring 8 in the transparent cap 80.
4 and the scale 87 of the transparent cap 80 as a change. Transparent cap 8 of grip 46
0 through the grip 46 from the outside of the transparent cap 80.
Since the inner ring 84 is visible and the transparent cap 80 protrudes forward, the operator can read the scale 87 of the transparent cap 80 by turning his face downward while carrying the power spreader 10 on his back.
The position of a predetermined portion of the ring 84 with respect to this scale 87 can be known, and thereby the opening degree of the shutter 28 at the outlet 29 of the spray tank 24 can be known. Furthermore, while observing the relationship between the scale 87 of the transparent cap 80 and the ring 84, the operator rotates the handle 46 relative to the shutter lever 44 to change the diameter of the tapered portion 88 at the position of the shutter lever groove 66. This results in
Shutter 2 while carrying the power spreader 10 on your back
8 can be adjusted to a desired opening degree.

Due to manufacturing and assembly errors of the backpack power spreader 10, the grip 4 of the shutter lever 44 relative to the swinging shaft 68 may vary for the same opening degree of the shutter 28.
The relative position of 6 changes. To deal with this,
Remove the transparent cap 80 from the threaded part 76, loosen the lock nut 86, adjust the position of the ring 84 in relation to the extending direction of the shutter lever 44, and when the ring 84 is at the predetermined scale 87, the shutter is opened at the predetermined opening degree. be obtained. In this way, the position of the ring 84 with respect to the scale 87 is made to correctly display the shutter opening degree.

FIG. 8 shows another biasing means for the swing shaft portion 68 of the shutter lever 44. As shown in FIG. Tension coil spring 90
are used in place of the torsion coil spring 70 in FIG.
and is locked to the swing shaft portion 68, and urges the swing shaft portion 68 upward.

〔Effect of the invention〕

In the first aspect of the invention, the grip is rotated with respect to the shutter lever to change the relative position of the grip with respect to the shutter lever, thereby adjusting the diameter of the tapered portion of the grip that contacts the side edge of the insertion groove. Therefore, in relation to the diameter of the tapered portion corresponding to the position of the insertion groove, the height at which the tapered portion contacts the side edge of the insertion groove changes, and the shutter opening degree can be adjusted. This adjustment is automatically made by the operator simply by releasing the grip, so the taper part allows the user to easily and quickly set the shutter opening to the desired value without having to look at the scale. can.

In the invention of claim 2, the position of a predetermined portion of the shutter lever with respect to the scale of the transparent portion through the transparent portion of the grip, that is, the relative position of the shutter lever and the grip, in other words, the location of the tapered portion of the grip that is positioned in the insertion groove. The operator can see the scale on the transparent part and the predetermined location of the shutter lever within the transparent part relative to this scale by simply turning his head downward while carrying the power spreader on his back. Therefore, the worker
You can check the shutter opening while carrying the power spreader on your back. In addition, the operator can adjust the relative position of the grip in the extending direction of the shutter lever by rotating the grip with respect to the shutter lever while carrying the backpack power spreader on his or her back. It is possible to adjust the opening degree to a desired value.

In the third aspect of the invention, the axial position of the spray amount display ring can be adjusted with respect to the extending direction of the shutter lever, similarly to the grip. Therefore, even if there is a relative error between the scale on the transparent part and the predetermined location on the shutter lever due to manufacturing errors,
By adjusting the position of the spray amount display ring, the exact shutter opening degree can be displayed from the position of the spray amount display ring relative to the scale.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention, in which Fig. 1 is a perspective view of the operating section of the metering device, Fig. 2 is a front view of the scale plate, Fig. 3 is a sectional view taken along the line - in Fig. 2, and Fig. 4 5 is a plan view of the transparent cap, FIG. 6 is a perspective view of the torsion coil spring, and FIG. 7 is a diagram showing the relationship between the swing shaft and the grip in the axial direction of the swing shaft. FIG. 8 is a diagram showing another biasing means for the swing shaft portion 68 of the shutter lever, and FIG.
The figure is an overall schematic view of the backpack power spreader, and FIG. 10 is a perspective view of the shutter operating mechanism. 10... Back power spreader, 24... Spray material tank, 26... Spray material, 28... Shutter, 29...
...Exit, 44...Shutter lever, 46...Grip, 66...Shutter lever groove (insertion groove), 7
0...Torsion coil spring (biasing member), 72...
Recess (reference position locking groove), 80...Transparent cap (transparent part), 82...Tip, 84...Ring (spread amount display ring), 87...Scale, 88...
...Tapered portion, 90...Tension coil spring (biasing member).

Claims (1)

[Scope of Claims] 1. A shutter 28 that is disposed at the outlet 29 of the spray material tank 24 and controls the outflow amount of the spray material 26 at the outlet 29; a shutter lever 44 that controls the shutter speed, and a grip 4 that has a tapered portion 88 on the base end side and is screwed onto the distal end side of the shutter lever 44.
6, an insertion groove 66 that extends in the vertical direction and gradually increases in width toward the bottom and is inserted through the tapered portion 88, and a reference that opens laterally into the insertion groove 66 at the lower end of the insertion groove 66. A metering device for a backpack power spreader, comprising a position locking groove 72 and biasing members 70, 90 for biasing the shutter lever 44 upward. 2. The backpack power dispersion device according to claim 1, wherein the grip 46 includes a transparent portion 80 through which the tip portion 82 of the shutter lever 44 can be seen through, and a scale 87 is provided on the transparent portion 80. Machine metering device. 3 The spray amount display ring 84 is connected to the transparent portion 80.
2. The metering device for a backpack power spreader according to claim 1, wherein the metering device is attached to the position of the shutter lever 44 in the interior so that the position of the shutter lever 44 in the extending direction can be freely adjusted.