JP2561552Y2 - Power sprayer shutter adjuster - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter adjuster for a power spreader such as a backpack power spreader, and more particularly, to a shutter adjuster which can easily adjust a link ratio.

[0002]

2. Description of the Related Art In a backpack power spreader disclosed in Japanese Utility Model Laid-Open Publication No. Sho 63-176566, an adjusting slot is provided on a link arm which swings integrally with a shutter, and the adjusting slot is provided with a lower slot. A plurality of locking grooves are formed along the side, and the bent upper end portion of the link rod that moves up and down with the operation of the shutter lever is inserted into the adjusting slot of the link arm, and the selected locking groove is formed. To be locked. When the link ratio, that is, the amount of change in the opening of the shutter with respect to the operation amount of the shutter lever, is changed, the bent upper end of the link rod is pushed in against the urging force of the spring, and the tip-side smaller diameter portion of the bent upper end is pressed. Is positioned in the long slot for adjustment, moved in the row direction of the locking grooves to the position of the desired locking groove, and then the pushing is released. In the shutter adjusting device of the backpack power spreader, in order to change the link ratio, there is no component to be removed such as a bolt when the link ratio is changed, so that the loss of the component can be prevented and the locking groove is provided. Therefore, reproducibility can be given to the link ratio.

[0003]

[Problem to be solved by the present invention]
In the backpack power spreader disclosed in Japanese Patent Publication No. 66, since the axial displacement of the bent end of the link rod after the link ratio is adjusted depends on the biasing force of the spring, the link rod is adjusted by the engine vibration or the like after the link ratio is adjusted. There is a fear that the bent end portion of the rod may be easily displaced in the axial direction, and may be displaced in the elongated hole for adjustment in the row direction of the locking grooves, thereby changing the link ratio.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shutter adjusting device for a power spreader which can omit removal of a component causing a loss in adjusting the link ratio and can ensure reproducibility of the link ratio. Another object of the present invention is to prevent a situation in which the link ratio is inadvertently changed by an external force such as vibration. The purpose of the invention of claims 2 and 3 is to
SUMMARY OF THE INVENTION It is an object of the present invention to provide a shutter adjuster for a power spreader, which can further reliably achieve the object of the invention.

[0005]

The present invention will be described with reference to the drawings corresponding to the embodiments. In the power spraying machine (10) which is a premise of claim 1, the opening of the shutter is changed by swinging by the operation of the shutter lever (18), and the amount of the spraying agent discharged from the spraying agent tank (32). Control. And a shutter adjusting device (12) for the power sprayer (10) according to claim 1.
Has the following components (a) to (c). (A) A link rod that is connected to the shutter lever (18) at one end and is displaced by operation of the shutter lever (18).
(26) (b) A plurality of insertion holes (40) that are selectively inserted through the insertion end (42) on the other end side of the link rod (26) and are arranged in a row and swing together with the shutter. Arm (34) (c) Fits into peripheral groove (44) of insertion end (42) projecting through insertion hole (40) and locks insertion end (42) in the axial direction. A locking arm (46) provided with a plurality of recesses (48) corresponding to each insertion hole (40) and supported so as to be relatively displaceable with respect to the link arm (34).

According to a second aspect of the present invention, in the shutter adjusting device (12) for the power spreader (10), the concave portion (48) of the locking arm (46) is formed around the insertion end (42) of the link rod (26). There is a biasing member (50) for biasing the locking arm (46) in a direction to fit into the groove (44).

In the shutter adjusting device (12) of the power spreader (10) according to the third aspect, the recess (48) of the locking arm (46) is formed in the circumferential groove of the insertion end (42) of the link rod (26). When the (44) is fitted into the recess (48), the opening has an inner protruding portion (54) that elastically expands as the recess (48) passes through the maximum width portion.

[0008]

The shutter adjusting device of the power sprayer according to claim 1 is provided.
In (12), the insertion end (4
2) is inserted through the selected insertion hole (40) of the link arm (34). In addition, the locking arm (46) has a circumferential groove (4) at a portion of the insertion end portion (42) protruding through the insertion hole (40).
4), the corresponding concave portion (48) is fitted, the insertion end (42) is locked in the axial direction, and the insertion of the link rod (26) from the insertion hole (40) of the link arm (34). The end (42) is prevented from coming off. When the shutter lever (18) is operated, the link rod (26) is displaced, and the link arm (34) is inserted into the insertion hole (40) through which the insertion end (42) of the link rod (26) is inserted. Swing at the swing ratio corresponding to. The shutter swings integrally with the link arm (34) to change the opening degree. As a result, the spray agent tank (3
The amount of spraying out from 2) increases or decreases.

To change the link ratio, that is, the amount of change in the degree of opening of the shutter with respect to the amount of operation of the shutter lever (18), the locking arm (46) is displaced relative to the link arm (34) to engage. Insert the recess (48) of the stop arm (46) into the link rod (2
6) Remove from the peripheral groove (44) of the insertion end (42). Thereby, the insertion end portion (42) is released from the locking in the axial direction by the locking arm (46), and is pulled out from the insertion hole (40) of the link arm (34),
The insertion hole (40) to be inserted is changed. Thereafter, the locking arm (46) is returned to the original position, and the concave portion of the locking arm (46) is again formed.
(48) is fitted into the circumferential groove (44) and locked in the axial direction.

In the shutter adjusting device (12) of the power spreader (10) according to the second aspect, the locking arm (46) has its concave portion (48) projecting from the insertion hole (40) of the link arm (34). Link rod
(26) is urged by an urging member (50) in a direction to fit into the peripheral groove (44) of the insertion end portion (42), and the operating force of the locking arm (46) by the operator. The insertion end (42) is firmly locked against the action of an external force other than the above. When the locking arm (46) is relatively displaced with respect to the link arm (34) in order to change the link ratio, the worker must stop the locking arm (50) against the urging force of the urging member (50). The link arm (34) is displaced relative to the link arm (34) to release the locking end of the insertion end (42) of the link rod (26) in the axial direction by the locking arm (46).

In the shutter adjusting device (12) of the power spreader (10) according to the third aspect, the inner protruding portion (54) on the opening side of the concave portion (48) is
When the circumferential groove (44) of the insertion end (42) of the link rod (26) fits into the concave portion (48) by an operator's operation force, when the circumferential groove (44) passes through the maximum width portion of the circumferential groove (44), After passing through, it returns to its original shape. Thus, the maximum width portion of the peripheral groove (44) of the insertion end portion (42) is separated from the concave portion (48) by the inner protruding portion (54) on the opening side of the concave portion (48) with respect to the escape from the concave portion (48). Is prevented.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 5 is a structural diagram of the shutter adjusting device 12 of the backpack power spreader 10. The scale panel 14 is disposed on the backpack power spreader 10 so that when the worker carries the backpack power spreader 10, it is located near the left side of the worker, and is displaced vertically by the worker. A throttle lever 16 and a shutter lever 18 are inserted into each long window. The throttle lever 16 is an engine (not shown) of the backpack power spreader 10.
Control the throttle opening. The shutter lever 18 is formed of a rod bent at a right angle, and the grip portion 20 at the distal end of the linear portion on the distal side projects forward from the long window of the scale panel 14 and is gripped by an operator during operation. It has become.
The support shaft portion 22 is a linear portion on the base end side of the shutter lever 18, extends in the horizontal direction, and rotates in the circumferential direction with the vertical displacement of the grip portion 20. Lever arm 24
Is fixed to the end of the spindle 22, protrudes radially from the spindle 22, and rotates integrally with the spindle 22. Link rod
The lower end 26 is rotatably connected to a selected one of the two insertion holes 28 of the lever arm 24 and extends in the up-down direction. The shutter case 30 is joined between a spraying agent tank 32 for storing the spraying agent and a fan case (not shown), and has an outlet (not shown) for discharging the spraying agent from the spraying agent tank 32 on the inner circumferential side. , And
A shutter (not shown) whose opening is increased or decreased by swinging is provided in the outlet. The link arm 34 is provided on the rear surface side of the shutter case 30 and has a shutter shaft of the shutter.
36 (FIG. 2) is fixed via bolts 38. The three insertion holes 40 are formed in a row in the link arm 34, and the insertion end 42 at the upper end of the link rod 26 is bent at a right angle toward the link arm 34, and is inserted into the selected insertion hole 40. ing. The row of insertion holes 40 formed in the link arm 34 does not necessarily mean that they are in a straight line, but is arranged on a circumference having the lever arm 24 as a center and the link rod 26 as a radius. You may.

FIG. 1 is an exploded perspective view of an assembled product such as the link arm 34. The bolt 38 is inserted into the insertion hole at the upper end on the base end side of the link arm 34 with the shaft part. The insertion end 42 has an annular groove 44 on the distal end side. The locking arm 46 has three semicircular concave portions 48 along the lower side corresponding to the insertion holes 40 of the link arm 34. The cylindrical collar 52 is fitted on the shaft of the bolt 38 between the link arm 34 and the locking arm 46, and the torsion coil spring 50 is fitted with the coil part on the cylindrical collar 52, and the two ends are connected with the link arm 34 and the coupling arm. The stop arm 46 is locked at a predetermined position.

FIG. 2 is an assembly diagram of the link arm 34 and the like to the shutter shaft 36. The link arm 34 is fastened to an end face of the shutter shaft 36 by screwing a bolt 38 to the shutter shaft 36, and rotates integrally with the shutter shaft 36. Locking arm 46
Is pushed toward the step portion of the shutter shaft 36 by the cylindrical collar 52, and is rotatable relative to the shutter shaft 36. The torsion coil spring 50 is configured such that the locking arm 46 is
The locking arm 46 is urged to swing toward. The locking arm 46 is fitted in the annular groove 44 at the semicircular recess 48.

FIG. 3 is a view showing the overlapping state of the link arm 34 and the locking arm 46 as viewed from the locking arm 46 side. The link arm 34 rotates integrally with the shutter shaft 36 (FIG. 2), while the locking arm 46 is rotatable relative to the shutter shaft 36. The locking arm 46 can be separated from the insertion end 42 by the relative rotation of the locking arm 46 with respect to the link arm 34.

FIG. 4 is an enlarged view of the semicircular recess 48. The semi-circular concave portion 48 projects inward and is elastically expandable.
A pair of inner projections 54 are provided on the opening side. The interval between the inner protrusions 54 in the free state is smaller than the diameter of the semicircular recess 48,
With the annular groove 44 fitted sufficiently deep into the semi-circular recess 48, the inner protrusion 54 is located below the lateral diameter of the circular cross section of the link rod 26 at the location of the annular groove 44.

The operation of the embodiment will be described. At all times,
The insertion end 42 of the link rod 26 is inserted into a selected insertion hole 40 of the link arm 34. Also, the locking arm 46
Is a link rod according to the biasing force of the torsion coil spring 50.
The half-shaft corresponding to the annular groove 44 in the portion of the insertion end portion 42 that swings toward the insertion end portion 42 of the insertion portion 42 and protrudes through the insertion hole 40 in a plane orthogonal to the axis of the insertion end portion 42. The circular recess 48 is fitted, the insertion end 42 is locked in the axial direction, and the link arm 34 is
The insertion end 42 of the link rod 26 is prevented from coming out of the insertion hole 40 of the link rod 26. When the operator operates the shutter lever 18, the link rod 26 is displaced, and the link arm 34 swings at a swing ratio corresponding to the insertion hole 40 through which the insertion end 42 of the link rod 26 is inserted, The shutter shaft rotates. The shutter rotates integrally with the shutter shaft 36 and swings at the outlet in the shutter case 30 to change the opening degree. As a result, the shutter is spread from the spraying agent tank 32 through the outlet of the shutter case 30. The amount of dispensed spraying agent increases or decreases.

The locking arm 46 is strongly pressed by the torsion coil spring 50 into the semicircular recess 48 into the annular groove 44 of the insertion end 42, and the locking arm 46 is moved upward by engine vibration of the backpack power spreader 10 or the like. By swinging, the locking of the semicircular concave portion 48 by the annular groove 44 is prevented from being carelessly released. When the insertion end portion 42 at the portion of the annular groove 44 is fitted sufficiently deep into the semicircular recess 48, as shown in FIG. Because it is located inside the inside of the semicircular recess 48, the inside projection 54 abuts the lateral diameter of the insertion end 42 when the lateral diameter of the insertion end 42 moves from inside to outside of the semicircular recess 48. Tangent, the insertion end from the semicircular recess 48
Prevent 42 from missing.

To change the link ratio, ie, the amount of change in the opening of the shutter with respect to the amount of operation of the shutter lever 18, the free end of the locking arm 46 is gripped and
Link arm against torsional force of coil spring 50
By swinging relative to 34, the semicircular recess of the locking arm 46
48 is removed from the annular groove 44 of the insertion end 42 of the link rod 26.
At this time, the pair of inner protrusions 54 on the opening side of the semicircular recess 48 is elastically expanded to allow passage of the portion of the semicircular recess 48 in the lateral diameter portion. With the separation of the semicircular concave portion 48 from the insertion end portion 42, the insertion end portion 42 is released from the insertion hole 40 of the link arm 34 by releasing the locking in the axial direction by the locking arm 46. Then, after the insertion hole 40 through which the insertion end 42 is inserted is changed, the locking arm 46 is swung toward the insertion end 42 in accordance with the biasing force of the torsion coil spring 50, and half of the locking arm 46 is again formed. The circular concave portion 48 is fitted in the annular groove 44 to lock the insertion end 42 of the link rod 26 in the axial direction.

In the embodiment shown, the annular groove 44 has an insertion end portion.
It extends around the entire circumference of 42, but when inserted
The lower part, which is suitably spaced from 48, can be omitted.

[0021]

[Effects of the Invention] The invention of claim 1 has the following effects. (A) To adjust the link ratio, the engaging arm is displaced relative to the link arm, the fitting of the peripheral groove of the inserting end of the link rod by the concave portion of the engaging arm is released, and the inserting end is removed. Since this is achieved by changing the insertion hole of the link arm to be inserted, there is no need to remove the component, and it is possible to prevent the component from being lost. (B) Since the link ratio is determined by selecting the insertion hole of the link arm for inserting the insertion end of the link rod, the link ratio used once can be easily reproduced later. (C) Since the insertion end of the link rod is fitted with the concave portion of the locking arm in the circumferential groove and locked in the axial direction, the link arm is prevented from falling out of the insertion hole. ,
A situation in which the link ratio changes carelessly with respect to engine vibration can be prevented.

According to the second aspect of the present invention, the locking arm is urged in a direction in which the concave portion is fitted into the peripheral groove of the insertion end of the link rod. Displacement of the concave portion in the direction away from the peripheral groove of the insertion end portion due to external force other than the above is suppressed, and the situation where the link ratio changes due to external force other than during operation can be more reliably prevented.

According to the third aspect of the present invention, when the peripheral groove of the insertion end of the link rod is fitted into the concave portion, the concave portion of the locking arm is elastically expanded with the passage of the maximum width portion of the concave portion. Since the protrusion is provided on the opening side, after the circumferential groove is fitted into the recess, the inner protrusion closes and prevents the circumferential groove from coming out of the recess, and as a result, the locking arm In addition, the displacement of the concave portion in the direction away from the peripheral groove of the insertion end portion against external force other than the operation force of the operator is suppressed, and the link ratio change due to the external force other than during the operation can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an assembled product such as a link arm.

FIG. 2 is an assembly diagram of a link arm and the like to a shutter shaft.

FIG. 3 is a diagram illustrating an overlapping state of a link arm and a locking arm as viewed from a locking arm side.

FIG. 4 is an enlarged view of a semicircular recess.

FIG. 5 is a structural view of a shutter adjusting device 12 of the backpack power spreader.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 backpack power spreader (power spreader) 12 shutter adjusting device 18 shutter lever 26 link rod 32 spraying agent tank 34 link arm 42 insertion end 44 annular groove (peripheral groove) 46 locking arm 48 semicircular recess (recess) 50 Torsion coil spring (biasing member) 54 Inner protrusion

Claims (3)

(57) [Scope of request for utility model registration] The shutter changes its opening degree by swinging by operation of a shutter lever (18), and the spraying agent tank (3)
In the power spreader (10) for controlling the dispensing amount of the spraying agent from (2), (a) a link that is connected to the shutter lever (18) at one end and is displaced in accordance with the operation of the shutter lever (18). A rod (26); and (b) a plurality of insertion holes (40) through which the insertion end (42) at the other end of the link rod (26) is selectively inserted. Swinging link arm (34), (c)
A plurality of recesses that fit into the peripheral groove (44) of the portion of the insertion end (42) that protrudes through the insertion hole (40) and locks the insertion end (42) in the axial direction. (48) corresponding to the plurality of insertion holes (40), and a locking arm (46) supported so as to be relatively displaceable with respect to the link arm (34). Shutter adjustment device for power spreader. 2. The recess (48) of the locking arm (46) is provided with the peripheral groove (44) of the insertion end (42) of the link rod (26).
The shutter adjusting device for a power spreader according to claim 1, further comprising a biasing member (50) for biasing the locking arm (46) in a direction in which the locking arm (46) is fitted. 3. The recess (48) of the locking arm (46)
The peripheral groove (4) of the insertion end (42) of the link rod (26)
When fitting 4) into the concave portion (48), it has an inner protruding portion (54) on the opening side, which elastically expands as the maximum width portion of the concave portion (48) passes. The shutter adjusting device for a power spreader according to claim 1 or 2, wherein: