JPH0414123Y2 - - Google Patents

Description

[Detailed explanation of the invention] 3-1 Industrial application field This invention uses a piston guide interposed between the piston rod and the cylinder, so that the piston rod is always
By raising and lowering the machine vertically, the lever can be operated easily, and unnecessary wear and damage to the piston rod, cylinder, piston seal, etc. can be prevented in advance. This is related.

3-2 Prior Art A conventional bag-type manual sprayer, which is widely used for spraying chemical solutions in fields, vegetable gardens, greenhouses, afforestation areas, etc., has a connecting piece 3, as shown in Fig. 3, for example. A lever 1 is fixed on one side (here, the right side) and a curved relay piece 5 is fixed on the other side (here, the left side) with fasteners 2 such as screws or rivets, and one end of the relay piece 5 is fixed. (here, the right end) is a pair of parallel fork pieces 7 above the metal piston rod 6,
7 and rotatably connect these fork pieces 7, 7 and the relay piece 5 with the pin 4,
The other end of the relay piece 5 (the left end in this case) is attached to the swing piece 8.
The swing piece 8 is rotatably attached to the upper end with a pin 9, and the lower end of the swing piece 8 is rotatably connected to a support shaft 12 installed in a stopper 11 fixed to the upper end of a metal cylinder 10. , the piston rod 6 is slidably fitted into the cylinder 10, and the piston rod 6 is raised and lowered by operating the lever 1 to draw and pressurize the chemical liquid in the chemical liquid tank 13 into the air chamber 14, and then the discharge pipe 15
The liquid can be ejected from a nozzle at the tip (none of which is shown) via a jet pipe connected to this. However, in a lever type sprayer, when the piston rod 6 is raised or lowered by operating the "lever" 1, the link mechanism described above is used to displace the piston rod 6 in the axial direction of the cylinder. Since a small amount of force also acts in a direction perpendicular to the axial direction of the piston rod 6, the piston rod 6 is pressed in an oblique direction. Extra force is required to press in this diagonal direction, and since the metal piston rod 6 is in sliding contact with the inside of the metal cylinder 10, unnecessary resistance force is generated and unpleasant sliding noise is generated. will occur. However, the piston rod 6 overcomes this resistance force.
The lever 1 requires extra force to raise and lower the piston rod 6, and the piston gasket (not shown) attached to the lower end of the piston rod 6 may slip on one side due to the force applied from the diagonal direction of the piston rod 6. death,
Abrasion occurs early and the function as a gasket is significantly reduced or lost, resulting in insufficient suction and pressurization of the chemical solution, which has the disadvantage that the desired effect of spraying the chemical solution cannot be obtained. ing.

3-3 Means to be solved by the present invention Therefore, with the intention of correcting the above-mentioned drawbacks, this invention places a piston guide in close contact with and along the inner circumferential edge of the upper cylinder, and uses the piston guide to guide the piston rod. By raising and lowering the piston vertically at all times, it can be operated easily without requiring unnecessary force on the lever, and it can withstand long-term use without causing the piston seal to slip to one side. The purpose is to provide a backpack-type manual sprayer.

3-4 Structure An example of this invention will be described below with reference to FIGS. 1 and 2. Lid bodies C ₁ and C ₂ are attached to the top and bottom of an elliptical (or cylindrical) chemical liquid tank T, respectively. The lower flange f of the covering body 21 is fixed to the center of the upper lid body C ₁ with a fastener j ₁ via the seat plate 22, and attached to the inner peripheral edge of this covering body 21. While the upper end of the cylindrical air chamber A is fixed by welding or other appropriate means, a substantially L-shaped stopper 23 with a through hole h is placed on the collar n fixed on the upper surface of the covering 21, and the stopper is The upper bent part q of the presser metal fitting 24, whose vertical portion v fits into the inner peripheral edge of the metal fitting 23, is brought into contact with the upper surface of the stopper metal fitting 23, and the presser metal fitting 24
A long cylinder 25 whose upper end is closely fitted and locked to the bent part q of is fitted and fitted inside the vertical part v, and is suspended to a position slightly above the lower lid _C2 of the chemical solution tank T. A suction valve S having a built-in sphere 26 is fixed to its lower end, and this cylinder 2
Piston guide 27 tightly fitted and fitted to the inner peripheral edge of 5
The flange g to be formed on the upper end of the presser metal fitting 2
The lower end of the piston guide 27 faces the intermediate position of the cylinder 25. Furthermore, at the upper end of the hollow rod 28 that is slidably and tightly fitted to the inner peripheral edge of the piston guide 27,
A holding plate 29 having a slightly larger diameter is fixed to the holding plate 29, and a pair of fork pieces 30, 3 facing each other are attached to the upper surface of the holding plate 29.
0 upright and fixed, while the upper fitting piece 31 fixed on the lower surface is brought into close contact with and fitted into the inner peripheral edge of the upper end of the hollow rod 28, and at the same time, the lower fitting piece 32 which is tightly fitted and fitted into the lower end of the hollow rod 28 is A holding piece 33 having an inverted T-shaped cross section is integrally hung and formed, and a male screw i is screwed into a female thread carved in the center of the holding piece 33, and the center is penetrated by this male screw i. The upper surface of the piston packing 34 having an inverted U-shaped cross section is brought into close contact with the lower surface of the holding piece 33, and the piston packing 34 is
A reinforcing piece 35 is attached to and along the inner peripheral edge of the reinforcing piece 35 and is fixed with a male screw i via a washer W. Accordingly, the hollow rod 28, the holding plate 29, the fork pieces 30, 30,
The upper and lower fitting pieces 31 and 32 are collectively referred to as a piston rod R.

A discharge valve E with a built-in sphere 36 is fixed and suspended on one side of the lower end (on the left side in FIG. 2) of an elliptical or cylindrical air chamber A through which the cylinder 25 is fixed in the center, and below the sphere 36. While connecting the through hole b bored in the cylinder 25 with the through hole p of the cylinder 25, the upper part of the discharge pipe 37 that can hang down in the air chamber A is fitted into the lower end of the discharge fitting 38 screwed onto the covering body 21. The root of the discharge hose 40 is removably fitted above the thumbscrew 39 screwed onto the discharge fitting 38, and a nozzle-equipped jet is attached to the tip of the discharge hose 40 via a gripping piece. A tube (none of which is shown) is connected.

A water inlet 42 is fitted near the outer periphery of the upper lid _C1 via a gasket 41, a water inlet plug 43 is fitted to the lower inner periphery of the water inlet 42 via a screw, and further this water inlet plug A strainer 44 with a measuring device m is installed between the lower end of the water inlet 43 and the protruding piece k at the lower end of the water inlet 42.
The strainer 44 is suspended in the chemical liquid tank T by sandwiching the flanges at the upper end of the strainer 44 . Further, the lower portions of the fork pieces 30, 30 in the piston rod R are sandwiched, and a connecting piece 46 is attached between the intermediate piece 45, which is rotatably connected at one end with a pin U, using a fastener y such as a screw or a stud. This connecting piece 46 is fixed and connected to the tip of the "lever" 47 via a fastening tool Z, while the other end of the relay piece 45 is rotated to the upper end of the swinging piece 48 using a fastening tool _j2. The lower end of this swinging piece 48 is rotatably fitted to a support shaft 49 which is inserted and fixed into the through hole h of the stopper 23, and the "lever" 47
The piston rod R can be raised and lowered by rotating in the vertical direction.

In the figure, 50 is a hanging hand, 51 is a water inlet, 52 is a water inlet plug, 53 is a gasket, and 54 is a piston guide 27
It is a coil spring that constantly springs and biases downward.

3-5 Action/Effect Since this device has the above-mentioned configuration, when the "lever" 47 is repeatedly rotated in the direction of the arrow to raise the piston rod R, the chemical solution d stored in the chemical solution tank T is , suction into the cylinder 25 from the suction valve S, at which time the discharge valve E is closed by the sphere 36, and then when the piston rod R descends, the suction valve S is closed by the sphere 26, and the discharge valve E is closed by the sphere 36. The inhaled chemical liquid pushes up the sphere 36 and flows into the air chamber A through the through hole b. Therefore, the chemical solution d flowing into and stored in the air chamber A is ejected from the nozzle in a desired direction through the ejection pipe 37, the ejection hose 40, and the ejection pipe. Since the piston rod R is tightly fitted into the piston guide 27 provided along the upper inner circumference of the cylinder 25, it is always guided vertically by the piston guide 27 when moving up and down. , there is no risk of the piston rod R being accidentally pressed diagonally, and therefore the piston rod R can be moved up and down easily without being subjected to unnecessary force, and there is no risk of the piston seal 34 slipping to one side. It is economical because it can withstand use for a long time without premature wear, and since the piston guide 27 is simply installed along the inner circumferential edge of the cylinder 25, the structure does not need to be complicated. It has practical benefits such as being robust and inexpensive to manufacture without causing any damage, and being easy for workers to operate and allowing them to perform their work with peace of mind.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of the main part of the product, FIG. 2 is a longitudinal sectional view of the product, and FIG. 3 is a sectional view of the main part of a conventional backpack-type spreader. 25... Cylinder, 27... Piston guide, R... Piston rod, T... Chemical tank.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A piston guide is closely fitted and fitted to the upper edge of the inner periphery of a cylinder suspended in a chemical liquid tank, and a piston rod is fitted tightly to the piston guide so as to be able to slide into the back. U-shaped human-powered spray machine. (2) The backpack-type manual sprayer according to claim 1, wherein the lower end of the piston guide is set at an intermediate position along the longitudinal direction of the cylinder.