JPH0128852Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is an electric sprayer that reciprocates a plunger using the driving force of a motor to obtain discharge pressure, and integrates a switch for pressure adjustment and starting. This relates to a starting switch for an electric sprayer that is linked to the start switch of an electric sprayer.

(B) Prior Art In the past, the starting switch in an electric sprayer was simply used to start and stop the motor, and in most cases had a separate structure from the lever that adjusted the pressure. However, in recent years, some safety valve reflex levers and start switches have been provided with a start switch on the lever so that the start switch is activated only when no pressure is applied.

(c) Problems to be solved by the invention As mentioned above, if the starting switch and the safety valve reflex lever are of different structures, for example, if the safety valve reflex lever is closed and pressurized at the time of starting, when the motor is started, The plunger does not move due to the pressure, and a motor with low starting torque cannot rotate and may burn out. Therefore, at the time of starting, the safety valve reflex lever must be opened to ensure no pressure is applied so that the motor can rotate easily, so two operations had to be performed at the same time, which could lead to erroneous operation. Also, even if the configuration is linked to a lever so that it can only be started when no pressure is applied,
The structure of the lever was complicated and difficult to operate.

(d) Means for solving the problem The present invention takes the above points into account, and in order to turn on the start switch by rotating the dial, a cam is provided on the rotating shaft of the dial, and the starting switch is turned on by simply turning the dial. It can be turned on by operation, and a pressure adjustment cam is installed on the same rotating shaft so that it can be started without pressurization, and the starting switch and pressure adjustment are configured to be linked.

(E) Embodiments and operations The purpose of the present invention is as described above, and the structure and operations of the embodiments shown in the attached drawings will be explained below.

Figure 1 is an overall front view of the electric sprayer. Figure 2 is also a plan view. FIG. 3 is also a side sectional view.

The electric sprayer of this embodiment is a small and portable sprayer, and has a motor 2 and a sprayer 3 housed inside a case 1, and a handle 4 for carrying around the case 1. The configuration of the sprayer is a drive shaft 5 of a motor 1.
An eccentric cam 6 is fixed to the cam 6, and a connecting rod 7 is fitted on the outside of the cam 6. 8 is a key, 9 is a crankcase, and 11 is a power cord. Conrod 7
is pivotally connected to an interlocking rod 10, and the other end of the interlocking rod 10 has a plunger 12 fixed thereto. With this configuration, when the drive shaft 5 is rotated, the eccentric cam 6 causes the plunger 12 to reciprocate within the cylinder 13, and due to this reciprocating sliding, the water inlet 16 is opened by the action of the water supply valve 14 and the water discharge valve 15. The chemical solution is supplied with water and discharged from the spout 17. 19,
Reference numerals 20, 21, and 22 are water stop seals, and 23 is a passage for returning the chemical solution leaking from the water stop seal 20 to the water supply port side.

As mentioned above, pressurized water is spouted by the reciprocating motion of the plunger 12, but there are times when the water spouting pressure becomes too high during continuous spraying, and at that time the overpressure is absorbed by the surplus water valve 25, which is biased by the spring 24. is opened and the chemical solution is discharged from the spillway port 18, thereby reducing the pressure. This pressure adjustment is performed by a dial 26, which also serves as a starting switch for the motor 2, and is an important part of the present invention.

That is, the rotating shaft 27 of the dial 26 is fitted into the case 28 of the spill valve 25, and the two cams 29,
30 is shaft-fitted. One of the cams is a cam 29 that presses the pushing body 31 via the springs 24 and 32 in the case 28 to change the pressing force of the valve 25.
The other side is a cam 30 that turns ON/OFF a contact 33a of a switch 33 that starts and stops the motor 2.

These two cams are connected to the rotation axis 2 of the dial 26.
7, pressure adjustment and starting are linked. That is, the dial 26
When the cam 30 is OFF, the start switch 33
The cam 29 is also in a non-pressurized state with the pushing body 31 released. When the dial 26 is turned on, the contact point 33a of the start switch is turned on and the motor 2 is rotated while no pressure is applied, as described above. In other words, since the starting torque of the motor is weak, the motor is allowed to rotate with no pressure applied when starting, and remains unpressurized until the rotational speed increases. When the rotational speed increases and reaches the normal rotational speed, the dial 26 is switched to "1" or "2" to obtain the desired water discharge pressure. At this time, the cam 29 is configured in two stages; at "1", the pushing body 31 is pushed down and pressure is applied to the spring 25, and at "2", the diameter of the cam 29 is increased to further strengthen the pressure;
1 is further pushed down and the discharge pressure increases. At that time, the contact 33a of the start switch remains ON in order to keep the motor 2 in operation. To stop, the operation is the reverse of the above, and it is only necessary to rotate the dial 26 in the opposite direction, and then rotate the dial 26 to the OFF position.

(f) Effects of the invention With the above configuration, starting/stopping and pressure adjustment of the electric sprayer can be performed simply by rotating the dial, and erroneous operations can be avoided. There was no more burning out of the motor. In addition, two cams are mounted on the rotating shaft of the dial and work together to ensure pressure adjustment and start/stop.
And since the parts to be adjusted are concentrated in one place, maintenance becomes easier.

[Brief explanation of the drawing]

Figure 1 is an overall front view of the electric sprayer. Figure 2 is also a plan view. FIG. 3 is a side sectional view as well. 2...Motor, 26...Dial, 27...
Rotating shaft, 29... cam, 30... cam.

Claims (1)

[Scope of utility model registration request] In an electric sprayer powered by a motor,
A starting switch for an electric sprayer, characterized in that a cam 29 for pressure adjustment and a cam 30 for turning ON/OFF the motor 2 are provided on the rotating shaft 27 of the dial 26, and each is configured to operate in conjunction with each other.