Hand tool for producing local over or under pressure

Details Hand tool for producing local over or under pressure Hand tool for producing local over or under pressure

1991-12-05

1993-11-02

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

417234, F04B 3504

Patent

active

052579131

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a hand tool for producing a local over or under pressure. More particularly this invention concerns such a tool having a housing, an adapter on the housing, a pump connected via a conduit to the adapter, a motor driving the pump, and a power supply for the motor.


BACKGROUND OF THE INVENTION

Such hand tools serve various purposes, e.g. the manipulation of small or extremely small objects such as elements in the electronic, optical, laboratory, and medical fields. In every case the tool should be as simple and easy to handle as possible.
This handling ease is limited in the known such hand tools in that the pump necessary for producing the desired under or over pressure is arranged outside the hand-held tool and is connected to same via a hose or the like. This hose substantially limits the ease of use and range of movement of the hand tool.


OBJECT OF THE INVENTION

It is an object of the invention to provide a hand tool of the described type which is easier to manipulate and move.


SUMMARY OF THE SUMMARY

This object is solved according to the invention by providing the pump and motor inside the housing of the tool. The arrangement of the pump and of the motor inside the tool, which is built to be held in the hand, allows one to dispense completely with feed tubes and the like. As a result the user of the tool is no longer limited by the presence of such tubes.
By providing the electrical power supply inside the housing the hand tool can be completely self-sufficient and constructed without any feed lines whatsoever. Thus the tool is extremely comfortable to use.
The formation of the pump as a vane pump according to the invention makes possible a particularly simple and light construction of the pump and thus a particularly low weight of the tool. In addition the vane pump has shown itself to be particularly well adapted for the desired purposes.
A particularly space-saving mounting of the motor inside the hand tool is possible according to the invention by flanging the motor directly on the vane pump.
According to the invention the hand tool is in a simple manner adaptable to a large number of applications without particular cost.
The separable construction of the housing according to the invention permits a continuous use of the expensive main part containing the motor and the pump so that the power supply that is not also being used can be charged.
Preferably the vane pump can be made in the dimensions of 18 mm outside diameter (preferably 13.5 mm) and 30 mm length (preferably 16 mm) so that it can be built into relatively slim hand tools without problems.


BRIEF DESCRIPTION OF THE DRAWING

The above and other objects, features, and advantages of the invention will become more apparent with reference to the accompanying drawing which is a large-scale axial section through the tool of the present invention.


SPECIFIC DESCRIPTION

The hand tool shown in the figure has a housing 1. The front end of the housing 1 is provided with an adapter 3. This adapter 3 is connected to an input port 5 of a vane pump via a conduit or hose 2 inside the housing. The outside diameter of the vane pump 6 is 13.5 mm and is thus slightly smaller than the inside diameter of the housing 1 whose outside diameter is at most about 17 mm. The vane pump 6 has a housing 7 defining a chamber. The chamber is eccentric to a rotor 9 which is provided at equispaced intervals about its periphery with axially extending slits in each of which is a radially shiftable slide 10. In use of the pump 6 the outer edge of each slide lies on the wall of the chamber. The eccentric orientation of the chamber wall relative to the rotor 9 creates a pressure change on rotation of the rotor 9 corresponding to the change in volume of each chamber portion delimited angularly by two slides 10 and this pressure change is communicated via the input port 5 and the hose 5 to the adapter 3 and thence to the opening of a not illustrated nozzle fitted to the adapter 3.
The rear side of the vane pump 6 tu

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