Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage
Patent
1997-04-09
1999-09-21
Harrison, Jessica J.
Tool driving or impacting
Passage in manipulating handle for drive motor motive fluid
Motive fluid control valve in handle passage
B23B 4504
Patent
active
059541423
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a pneumatic power tool of the type having a housing with a pistol type handle, a motor in the housing, a pressure air inlet passage and an exhaust air passage extending substantially in parallel to each other through the handle, and a manually operable throttle valve located in the air inlet passage.
In this type of power tool, as for example in the tool disclosed in GB 2 098 528, it is difficult to satisfy the demand for good heat insulation in combination with an acceptable grip size of the handle.
In a tool of the above type, the handle is formed in a heat conducting light metal alloy, and since the exhaust air passing through the handle is very cold due to previous expansion in the motor, the outer surface of the handle becomes uncomfortably cold for the operator.
In order to solve this cold problem, an insulating layer of a suitable material sometimes been applied on the outside of the handle. This adds to the grip size of the handle and makes the handling of the tool not only uncomfortable and tiresome but in some cases unsafe.
Another problem with the above type of power tool is that the grip size of the handle is not variable. This means that a comfortable handling of the tool is only available to those operators who have a certain hand size, whereas the handle is too thick for persons with smaller hands, like many female operators, but too slim for persons with big hands.
A solution to chis problem and also to the cold problem is shown in EP-A-481 947. In this publication there is described a penumatic power tool with a pistol type handle having a grip element which is easily excangeable for alternative grip elements of different sizes to suit different operators. The cold problem is solved because exhaust air does not at all pass through the handle. Instead, this known tool has a specially designed housing for communicating inlet air as well as exhaust air between a top location on the housing and the motor.
Apart from the fact that this known tool housing is more complicated and more expensive, the inlet and exhaust air passages are separated from the handle. This means that the most common and in most cases the most suitable air conduit connection and exhaust air outlet at the outer end of the handle is not possible in this prior art tool.
SUMMARY OF THE INVENTION
According to the invention, there is provided a pneumatic power tool which solves all of the above discussed problems. The invention provides a pistol type power tool which comprises a handle which not only enables good heat insulation and adaptation of the grip portion size to the operator's individual needs but which retains the conventional and simple tool housing design as well as the most desirable air inlet and outlet location at the outer end of the handle.
A preferred embodiment of the invention is described below with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows a side view, partly in section, of a power tool according to the invention.
FIG. 2 shows, on a larger scale, a fraction of the power tool in FIG. 1.
FIG. 3 shows a cross section along line,III=13 III in FIG. 2.
DETAILED DESCRIPTION
The power tool shown on the drawings comprises a housing 10 with a pistol type handle 11 and a throttle valve 12. Within the housing there is located a pneumatic motor (not shown) which is supplied with motive pressure air through an inlet passage 13 and which exhausts air through an exhaust passage 14. The inlet and exhaust passages 13, 14 extend substantially in parallel to each other through the handle 11.
The throttle valve 12, which is manually operable by a push button 16, forms part of the inlet passage 13. The throttle valve 12 also traverses the exhaust passage 14 and comprises an outer sleeve 17 with two lateral openings 18, 19 which form part of the exhaust passage 14.
The handle 11 comprises a central tubular stem 20 which forms a part of the inlet passage 13 and which is formed by a protrusion 21 from the h
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Atlas Copco Tools AB
Harrison Jessica J.
Paradiso John
LandOfFree
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