GB1593638A

GB1593638A - Jet spray devices

Info

Publication number: GB1593638A
Application number: GB24594/78A
Authority: GB
Original assignee: Gerni AS
Current assignee: Gerni AS
Priority date: 1977-06-02
Filing date: 1978-05-30
Publication date: 1981-07-22
Also published as: DK150789C; NL7806012A; DK150789B; DE7808088U1; DK243377A; FR2393511A7

Description

(54) IMPROVEMENTS IN OR RELATING TO JET SPRAY DEVICES (71) We, GERNI A/S, of Myntevej 5, Helsted, 8900 Randers, Denmark, a Danish company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a jet spray device.

Jet spray devices for mounting at an end of a spray pipe of a high pressure water cleaner for hot and cold water may comprise a hand grip with an inbuilt spring loaded pistol grip for a closure valve at one end, and, at the other end a double spray tube divided into two twin tubes each furnished at its free end with a spray nozzle and of which the one is provided with a regulating valve, for example, a needle or ball valve for stepless variation of the water pressure by adjustment of the valve, a side handle being arranged on the spray tube device for manipulation and control of the spray tubes.

In jet spray tubes of this kind, the water pressure in the pipe connected with the high pressure pump of the cleaner is regulated in that the regulating valve on the one branch of the double spray tubes is opened to a greater or a lesser extent. In this way, the water pressure can be steplessly varied and one can for example, at the beginning of a cleaning operation, first eject water which contains a cleaning medium under a relatively low pressure, and then rinse with clean water under high pressure. In this way, a substantial amount of the cleaning material is saved, and the possibility is provided of reducing the pressure of the spray from a dangerous level.

Because the recoil on the occurrence of high pressure can be very great, it is necessary that such a jet spray device be provided not only with a separate side handle but also with a rear hand e having a spring loaded pistol grip or trigger (dead man's handle) included therein, so that the jet can be safely controlled under all circumstances. If the user of a known jet tube device wished to alter the water pressure by turning the regulating valve, it was necessary to let go of the handles of the device so that the valve could be adjusted with a free hand, which could produce not only a delay in the operation but also some risk of damage to the work.

The invention is concerned with the provision of a jet tube device of this kind which is easier and safer to attend to during operation than known jet tubes, in particular because stepless regulation can be achieved without interruption of the work and with the jet tube securely held.

The invention thus provides a jet spray device comprising a first handle with an associated control trigger for a closure valve and a grippable side handle which can be rotated to control a stepless regulating valve.

Preferably, the regulating valve is in one only of a double tube arranged to be supplied with fluid under control of the closure valve.

By this means, regulation of the water pressure can take place during operation continuously. The spray tube provided with the regulating valve preferably comprises a nozzle with a relatively large opening, and the regulating valve on opening allows the water pressure to drop e.g. to about 10 bar at the start of a cleaning operation, if cleaning fluid is to be added. An injector associated with the high pressure cleaner can be connected to the spray tube and be so arranged that the fluid additive is sucked into the water only if the pressure in the flow is reduced to about 10 bar. If the user, who already has both hands on the spray tube, reduces the pressure by turning the regulation side handle, cleaning liquid is sucked into the water, and if he later wishes to rinse - in order to remove cleaning fluid and dirt - he need only turn the regulating side handle so that the pressure rises. The injector then stops the introduction of the fluid additive, and the rinsing continues with clean water only.

The regulating valve may comprise a valve spindle projecting out of a valve housing, on which the grippable side handle is readily non-rotatably mounted.

In the accompanying drawing, an embodiment of a jet spray device according to the invention is shown.

At one end of a spray tube, there is provided a handle 1 with an in-built, spring loaded pistol grip or trigger. The handle 1 serves as a deadman's handle, because a closure valve for the stream of water is cut off if the trigger is released. The other end of the spray tube is formed as a double spray tube, which consists of two twin tubes 2, 3, each having a respective nozzle 4, 5, at its free end.

The twin tube 2 has an open connection between the closure valve in the handle 1 and the atmosphere, whilst the twin tube 3 is provided with a regulating valve 6, such that the passage of water through this tube can be continuously varied by turning a grippable side handle 7 located on the regulating valve.

This handle 7 and the handle 1 also serve as handles for controlling the outwardly projected jets.

During operation of the high pressure jet spray device, water is sprayed through the twin tube 2 and the nozzle 4 at all times, if the closure valve in the handle 1 is open. On completely closing the twin tube 3, by the regulating valve 6, the water pressure dependent among other things on the size of the opening of the nozzle - becomes very great e.g. 150 bar so that a corresponding back pressure is generated which requires the user of the spray device to take good hold with both hands. On opening of the regulating valve 6 by rotation of the handle 7, a greater or lesser quantity of water flows out through the twin tube 3 and the nozzle 5, so the pressure is reduced. In the already known spray devices- in order to operate a valve on the twin tube 3 - one must close the closure valve by releasing the handle 1, unless one risks any accidents due to lack of control with only one hand. By the handle 7 fixedly connected to a regulating spindle projecting rigidly from the housing of the regulating valve 6, the water pressure can at any time be steplessly adjusted, for example, in injector mounted on the high pressure cleaner can be so constructed that, on reduction of the water pressure to about 10 bar, an additive liquid is sucked into the water and that this injection ceases when the water pressure is again increased. The injector thus operates as an on/off cleaning fluid dosage mechanism, which is also operated through the handle 7.

The jet spray device is thus useful for working with cleaning liquid as well as in connection with water/sand blasting equipment.

WHAT WE CLAIM IS: 1. A jet spray device comprising a first handle with an associated control trigger for a closure valve and a grippable side handle which can be rotated to control a stepless regulating valve.

2. A jet spray device according to claim 1 having the regulating valve in one of a double tube arranged to be supplied with fluid under control of the closure valve.

3. A jet spray device for mounting at an end of a spray pipe of a high pressure water cleaner for hot and cold water and with a handle at one end with an integral, springloaded pistol grip for a closure valve and a double jet tube arranged at the other end, each tube having a spray nozzle at its free end, one of which is provided with a regulating valve for stepless adjustment of the water pressure by operation of the regulating valve, and a grippable side handle arranged on the one tube for manipulation and control of the tubes and being constructed as a rotatable control handle for adjustment of the regulating valve of the one tube.

4. A jet spray device according to claim 2 or 3 wherein a or the nozzle at the end of the one tube has an opening which is greater than the opening of the nozzle arranged on the other tube.

5. A jet spray device according to claim 1, 2, 3 or 4 with a valve spindle projecting out of a regulating valve housing, the rotatable side handle being non-rotatably mounted on the outwardly projecting spindle.

6. A jet spray device according to any preceding claim having a connection with a container for a cleaning medium and with an injector which is so arranged that it can draw cleaning medium into the device if water pressure in the device is under a predetermined value.

7. A jet spray device substantially as herein described with reference to the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. loaded pistol grip or trigger. The handle 1 serves as a deadman's handle, because a closure valve for the stream of water is cut off if the trigger is released. The other end of the spray tube is formed as a double spray tube, which consists of two twin tubes 2, 3, each having a respective nozzle 4, 5, at its free end. The twin tube 2 has an open connection between the closure valve in the handle 1 and the atmosphere, whilst the twin tube 3 is provided with a regulating valve 6, such that the passage of water through this tube can be continuously varied by turning a grippable side handle 7 located on the regulating valve. This handle 7 and the handle 1 also serve as handles for controlling the outwardly projected jets. During operation of the high pressure jet spray device, water is sprayed through the twin tube 2 and the nozzle 4 at all times, if the closure valve in the handle 1 is open. On completely closing the twin tube 3, by the regulating valve 6, the water pressure dependent among other things on the size of the opening of the nozzle - becomes very great e.g. 150 bar so that a corresponding back pressure is generated which requires the user of the spray device to take good hold with both hands. On opening of the regulating valve 6 by rotation of the handle 7, a greater or lesser quantity of water flows out through the twin tube 3 and the nozzle 5, so the pressure is reduced. In the already known spray devices- in order to operate a valve on the twin tube 3 - one must close the closure valve by releasing the handle 1, unless one risks any accidents due to lack of control with only one hand. By the handle 7 fixedly connected to a regulating spindle projecting rigidly from the housing of the regulating valve 6, the water pressure can at any time be steplessly adjusted, for example, in injector mounted on the high pressure cleaner can be so constructed that, on reduction of the water pressure to about 10 bar, an additive liquid is sucked into the water and that this injection ceases when the water pressure is again increased. The injector thus operates as an on/off cleaning fluid dosage mechanism, which is also operated through the handle 7. The jet spray device is thus useful for working with cleaning liquid as well as in connection with water/sand blasting equipment. WHAT WE CLAIM IS:

1. A jet spray device comprising a first handle with an associated control trigger for a closure valve and a grippable side handle which can be rotated to control a stepless regulating valve.