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Патент USA US3019683

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Feb. 6, 1962
F. S. SJOSTRAND ETAL
PORTABLE POWER TOOLS
File d F e b. l 7.. 1 9 5 9
[2
3,019,673
United States Patent @f?ce
1
,
3,d1§,673
Patented Feb. 6, 1962
2
sages in said projecting wings leading from said dampen
lng chamber to the atmosphere and opening at the for
ward ends of said wings. Other features of the inven
.
PORTABLE POWER TOOLS
tion will appear from the following description of a pre
Frltiof Stig Sjtistrand, Stockholm, Carl Otto Lennart
ferred embodiment of the invention selected for the
Ottosson, Elrtorp, and Stig Rune Zerncll, Johanneshov,
purpose of illustration only and which should not be
Sweden, assignors to Atlas Copco Aktiebolag, Nacka,
considered to limit the invention, the scope of which is
Sweden, a corporation of Sweden
set forth in the appended claims.
Filed Feb. 17, 195i)‘, Ser. No. 793,786
In the drawing, FIG. 1 is a perspective rear and side
8 Claims. (Cl. 77--7)
view of a pneumatic drill embodying to the invention.
This invention relates to portable power tools of the 10 FIG. 2 is a front view of the drill illustrated in FIG. 1;
FIG. 3 is a perspective plan view of the drill in slightly
gun type having a barrel portion accommodating a mo
depressed position. FIG. 4 is a longitudinal section of the
tor, an implement-carrying chuck and a handle portion
extending downwardly and rearwardlyfrom said barrel
drill illustrated in FIGS. 1 and 3 on lines IV-—IV in FIG.
2. FIG. 5 is a section on lines V——V. FIG. 6 a section
portion at an obtuse angle. One object of the invention
is to provide a body for a portable power tool which ?ts 15 on lines VI-VI, and FIG. 7 a section on lines VII--VII
of FIG. 4. FIGS. 5-7 are ‘on a reduced scale as com
a hand holding the tool and producing an axial pressure
pared with FIG. 4. FIG. 8 is a perspective view of a tool
in the direction of the axis of the barrel. Another ob
embodying the invention lying on a table and shows a
ject of the invention is to provide a body for a tool
3,019,673
having a large rear surface on which pressure may be
hand about to grasp the tool.
.'
The pneumatic drill illustrated in the drawing is pro-l
exerted by a hand holding ‘the tool. Another object 20
vided with a body which may be cast from a suitable
of the invention is to provide a body for a portable power
aluminum alloy, arti?cial resin, or other suitable material
tool of the type described which is cheap in manufac
and which consists generally of a barrel portion 1 and
ture and ?ts into the hand of an operator in a manner
which requires little effort. A further object of the in 25 a handle portion 2 extending downwardly and rearward
ly from said barrel portion at an obtuse angle. ,The
vention is to provide a body for a tool of the above men
barrel portion 1 forms projecting wings 3, 4 at‘ each side
tioned type in which the feeding of the tool towards
of the barrel portion extending longitudinally forward’
the article to be operated on may be carried out with
out subjecting the hand holding the tool to a bending
moment or which subjects the hand or wrist to a very
ly and separated by a ridge 5 so as to form between them
upper concave portions 6 and 7, respectively, in which
small moment in the two main planes of movement of 30 the fore?nger 8 and the thumb 9 of a hand 19 holding
the rear part of the barrel and the handle portion 2 of
the wrist. A still further object of the invention is to
the tool may rest. At the rear end of the barrel 1 and
provide a body for atool of the type described in which
the back of the handle portion 2 a curved portion 11 is
the twisting moment of a motor provided in the tool
formed which ?ts the palm and the heel of the hand and
body is taken up by the hand holding the tool with as
little strain as‘ possible. A still further object'of the in 35 said portion 11 ends in a lip 12 at the upper end of the
barrel. The portion 11 forms a large and broad surface
‘vention is to provide a tool in which the thumb and fore
against which the hand presses and which has so large
?nger are used together for guiding the tool towards
an area that only a moderate pressure per square ‘centi
the work and the other ?ngers are used for manipula
meter is produced. The wings 3 and 4 and the under
tion of the trigger or its equivalent. ' A still further ob
ject of the invention is to’ provide a body for a tool of 40 side 13 of the barrel portion are form-ed rather ?at so as
to permit freemotion of the middle ?nger 14 of the hand
the type described in which a rotary motor and speed
19 so that said ?nger may be used to manipulate the
reduction gear may be assembled into the tool body from
trigger 15 disposed in the angle included between the
the front end of the body. A further object of the in
barrel portion 1 and the handle portion, 2, and having a
vention is to provide a body for a tool of the type de
scribed in which ample space is provided for exhaust
45
silencing means and in which the exhaust air from an air
motor is_ expelled in such a manner that it does not
rectilinear motion in the handle portion directed substan
tially towards the centre of the wrist of a hand holding
the tool. While the thumb and fore?nger, when the tool
is grasped, guide the tool and hold itpcarefully in a de
interfere with the hand holding the tool. A still fur;
th'er object of the invention is to provide a tool of the 50 sired direction, the manipulation of the trigger has no
or very little tendency to change such direction. The
type described in which the manipulation of controlling
tool is therefore very easy‘ on the operator and causes
means for the tool motor has very little tendency to
but little fatigue even if it is used during long periods.
change the direction in which the tool is held. A still
When the tool rests on a table the balance is such that
further object of the invention is to provide a tool which
the tool takes a slightly depressed position as is ob
when lying on a table is easy to grasp w'th one hand
vious from FIG. 8. It is therefore possible for the op;
in such a way that the operator immediately obtains the
erator to get the correct grip on the tool immediately,
correct grip for operation of the tool. '
and it is not necessary for him to change or adjust his
For the above and other purposes we provide a body for
grip before he starts to work with the tool, which re
a portable power tool of the gun type having a barrel
portion accommodating a motor which may be a rotary
duces operating time.
Compressed air is supplied to the tool through a bush
air motor, a rotary electric motor, or a reciprocating mo~
ing 16 ?tted in the lower end of the handle portion 2,
tor, means for securing a chuck at the front end of said
and the supply to the motor is controlled by a valve 17
barrel portion, a handle portion extending downwardly
manipulated by means of the trigger 15. A chamber
and rearwardly from said barrel portion at an obtuse an
in the handle may be used for providing a suitable lubri
gle, and a projecting wing at each side of said barrel
cant which is conveyed to the compressed air inlet through‘
portion extending longitudinally of said barrel portion
to form a rest or support for the thumb and fore?nger
and means for separating said thumb and fore?nger from
the other ?ngers of a hand grasping the rear end of the
a wick 19. In the illustrated embodiment 20 is a rotary
air motor of the sliding vane type ?tted in a bore 21 in
the barrel portion 1. Two exhaust chambers 22, 23 sur
barrel portion and the handle portion, said barrel portion 70 round the cylinder of the motor and communicate with
each other through narrow spaces 33 and through re
forming a ridge separating said thumb and fore?nger.
In pneumatic tools of this type we provide a noise damp
ening ‘chamber in said barrel portion, and exhaust pas
stricted passages 24 with a second. exhaust chamber 25
3,019,673
3
in the barrel portion 1 which arrangements result in a
considerable noise dampening effect on the
From the chamber 25 exhaust passages 26
in the wings 3, 4 convey the exhaust air to the atmosphere
tom of the barrel portion forming a relatively ?at under
side, a comparatively broad
rear side of said handle portion,
into a ridge
directed upwardly and rearwardly, merging
?tting the palm of a hand holding said pressure surface
in a forward direction with respect of the tool so that
the exhaust does
not interfere with the hand 10 holding
the tool.
'
cates a cap covering the front
30 is a tool spindle and 31 a chuck carried by said spindle.10
hand holding the tool.
in which a drill or other working implement
4. A portable power tool of the gun type having a
barrel portion accommodating a rotary pneumatic mo
15 tor and an implement-carrying chuck and a handle por~
tion extending downwardly and rearwardly fromv said
barrel portion
a ridge formed by
projecting wing
to the ‘bottom
The tool is consequently very easy on
the hand and causes very little fatigue in operation. The
tool is also very easy to grasp when lying
dinally of the barrel portion at the
25
the wings do not increase the minimum distance between
the tool axis and the surface 5 which de?nes how close 30
to a wall or a corner the tool may be operated.
The above described tool is only an example and the
invention may be modi?ed in several ways within the
scope of the claims.
35 said hand holding the tool.
What we claim is:
l. A portable power tool of the gun type having a ban,
5. A’ portable power operated tool of the gun typehav
rel portion accommodating a motor and an implement
Qarrying chuck and a handle portion extending down
wa'raly and'lrearwardly from, said barrel portion at an
ing a barrel portion accommodating a rotary motor and
an implement-carry chuck and a handle portion extend
obtuse‘, angle, a projecting wing at each side of said bar
rel portion, extending longitudinally of said barrel por~
tioh to form a rest or support for the thumb and fore
barrel' portion to form a
rest or support for the thumb and fore?nger at the sides
of the upper half of the cylinder of a hand holding said
portion, and exhaust passages in said projecting wings
leadingfroin said dampening means to the atmosphere 50 barrel and handle portions and saidrwings beingridge
and opening at the forward ends of said Wings.
“2. A portable power tool as de?ned in claim 1 having
a pneumatic motor disposed in said barrel portion, an air
'
'
‘
'
and
the
wings
55
wings. from said second exhaust chamber.
common rotary axis.
3. A portable power tool of the
60
6. A portable power operated tool of the gun type hav
rel portion accommodating a motor and an implement
ing a barrel portion accommodating a rotary motor, a
handle portion extending down
wardly and rearwardly from said barrel portion at an ob
tuse angle, a motor cylinder in said barrel portion ar
ranged With its axis longitudinally of the axis of the bar
rel portion, a rotor in said cylinder mounted to rotate
ing a driving connection between said
motor and said
spindle, a handle portion extending
wardly from said ‘barrel portion downwardly and rear
about ‘an axis longitudinally of the ‘axis of said barrel
portion a projecting wing at each side ofsaid barrel por
tion close to the bottom of the barrel portion extending
longitudinally of the barrel portion to form a rest or sup 70
port for the thumb and fore?nger at the sides of the upper
half of ‘the cylinder and means for separating said thumb
paratively broad pressure surface at theupper rear side
and fore?nger from the other ?ngers of a hand holding
of said handle portion merging into a ridge directed, up—
said
barrel
andi’ 'handle portions,
'
n
‘
said wings and the bot
75 wardly and rearwardly, said pressure surface ?tting the
palm of a- hand holding said tool, a. projecting, Wing at
8,019,673
each side of said barrel portion close to the bottom of
and fore?nger of a hand holding the tool.
8. A tool as de?ned in claim 7, in which the shaft of
said rotor carries an implement-carrying chuck coaxial
the barrel portion extending longitudinally of the barrel
portion to form a rest or support for the thumb and
fore?nger of said hand ‘at the sides of the upper half of
the cylinder and a means for holding apart said thumb
with the rotor, said groove-like portions of said barrel
portion being substantially parallel and coplanar in a
plane substantially coincident with the axis of said chuck,
and fore?nger from the other ?ngers of the hand holding
said barrel and handle portions, and a trigger close below
whereby the plane passing through the thumb and fore
said barrel portion and said wings being ridge-shaped
and extending laterally of said barrel portion substan
tially at the handle side of said rotor axis for manipulat
ing said motor.
7. A portable power tool of the gun type having a gen
6
of the upper sides of the wings for supporting the thumb
?nger of a hand grasping the tool in intended fashion is
10 coincident with or closely adjacent to the axis of said
rotor and said chuck, to thereby provide for optimum
‘guidance and application of longitudinally exerted force
on the implement operated by the tool, by the hand
of the operator.
having a rotor coaxial with said barrel portion and a han
dle portion extending downwardly and rearwardly from 15
References Cited in the tile of this patent
said barrel portion at an obtuse angle, laterally project
FOREIGN PATENTS
ing wings extending longitudinally of said barrel por
Great Britain _________ -_ July 29, 1941
tion at each side thereof, said wings providing with the
538,315
Great Britain __________ ... Aug. 26, 1949
upper part of said barrel portion concavely rounded and
628,337
erally cylindrical barrel portion accommodating a motor
substantially parallel groove-like portions at the bases 20
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