DISPLACEMENT AND SUPPORT DEVICE FOR A PORTABLE POWER TOOL

DISPOSITIF DE DEPLACEMENT ET DE SUPPORT POUR OUTIL ELECTRIQUE PORTATIF

English Abstract

A displacement and support device including a power cylinder provided at its opposite ends, respectively, with an assembly element for connecting the power cylinder with power tool and a support leg, a control valve for controlling operation of the power cylinder , and a manually rotationally adjustable actuation member for actuating the control valve , with the actuation member being formed as a handle extending transverse to an axis of the power cylinder and rotationally adjustable about a handle axis within a rotational angle of 180° that encompasses an entire control region of the control valve.

French Abstract

Un dispositif de déplacement et de support comprenant un vérin de commande fourni à ses extrémités opposées, respectivement, avec un élément d'assemblage pour relier le vérin de commande avec l'outil électrique et une jambe de force, une soupape de commande pour commander le fonctionnement du vérin de commande, et un élément d'actionnement réglable par rotation manuelle pour actionner la soupape de commande, avec l'élément d'actionnement étant réalisé sous forme de poignée s'étendant transversalement à un axe du vérin de commande et réglable par rotation autour d'un axe de poignée dans un angle de rotation de 180° qui comprend une région de commande complète de la soupape de commande.

Claims

The embodiments of the invention in which an exclusive property or privilege
is
claimed are defined as follows:
1. A displacement and support device for a portable power tool, comprising:
a fluid-operated power cylinder;
assembly means provided at one end of the power cylinder for connecting the
power cylinder with the power tool;
a support leg provided at another, opposite end of the power cylinder;
a control valve for controlling operation of the power cylinder; and
a manually rotationally adjustable actuation member for actuating the control
valve, the actuation member being formed as a handle extending transverse to
an axis
of the power cylinder and rotationally adjustable about a handle axis within a
rotational
angle of 180° that encompasses an entire control region of the control
valve;
wherein the assembly means is formed as a partially torsion-free bolt
connection
element extending transverse to the power tool axis, and projects sideways on
one side
of the one end of the power cylinder and extends through an eyelet provided on
the
power tool.
2. A displacement and support device according to claim 1, wherein the handle-
shaped actuation member is rotationally adjustable within a rotational angle
of 90° that
encompass the entire adjustable region of the control valve.
3. A displacement and support device according to claim 1, wherein the control
valve is formed as a continuously adjustable rotary valve.
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4. A displacement and support device according to claim 1, wherein the power
cylinder is formed as a double-action cylinder.
5. A displacement and support device according to claim 1, wherein a fluid
conduit
is formed in an interior of the bolt connection element and extends along a
portion of a
longitudinal extent thereof.
6. A displacement and support device according to claim 1, wherein the power
cylinder is hydraulically operated.
7. A displacement and support device according to claim 1, wherein the support
leg
is formed as an elongate member.
8. A displacement and support device according to claim 1, comprising a claw
member securable with a cross-pin for connecting the support leg with another
end of
the power cylinder.
9. A displacement and support device according to claim 1, comprising a
stirrup-
shaped handle rotatably and linearly displaceably mountable on the power
cylinder.
10. A displacement and support device for a portable power tool, comprising:
a fluid-operated power cylinder;
assembly means comprising a partially torsion-free bolt connection element
extending transverse to the axis of the power cylinder for connecting the
power cylinder
with the power tool;
a support leg provided at another, opposite end of the power cylinder;
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a control valve for controlling operation of the power cylinder;
a manually rotationally adjustable actuation member for actuating the control
valve, the actuation member being formed as a handle extending transverse to
an axis
of the power cylinder and rotationally adjustable about a handle axis; and
a fluid conduit disposed within said assembly means.
11. A displacement and support device according to claim 10 wherein said fluid
conduit is disposed within a portion of said bolt connection element.
12. A displacement and support device according to claim 11 wherein said
handle is
rotatable within a rotational angle of 180°.
13. A displacement and support device according to claim 10 wherein the
control
valve is formed on a continuously adjustable rotary valve.
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Description

CA 02415057 2002-12-23
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a displacement and support device for a
portable power tool, in particular, a percussion power tool, preferably, for
forming
shot holes during underground mining works.
2. Description of the Prior Art
Such portable power tools, which are driven hydraulically, pneumatically, or
electrically, weight about 15 kg and are usually equipped with an elongate,
water-
flushed drill rod which is rotatably and axially displaceable, within narrow
limits,
secured in the power tool and is provided at its free end with a drill bit
made of a
hard material and having a diameter of about 35 mm.
German Patent DE 74833 discloses a portable electrical rock power drill for
drilling shot holes during underground mining works and provided with an
elongate
water-flushed drilling rod with a drill bit made of hard material, and a
support device.
The drill rod displacement is effected with a hydraulic cylinder of which the
telescopic drill rod forms a part.
U.S. Patent No. 4,000,873 discloses a portable power tool with an easily
mountable displacement and support device which is supported on the ground and
simultaneously applies a controlled displacement force to the drill. For
forming
substantially horizontal holes, the displacement and support device is
inclined
rearwardly and downwardly.
U.S. Patent No. 1,464,486 discloses a rotary-percussion power tool having a
one-leg support and a discretely controlled control valve rotatable about 360
. A
sensitive manual control of the displacement and support device with such a
valve is
not possible.
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CA 02415057 2002-12-23
U.S. Patent No. 1,151,261 discloses a fluid-driven percussion power tool with
an axially arranged, one-leg support that is formed as a double-action
cylinder and
displacement of which is constantly controlled by a radial, rotationally
adjustable
worm gear valve by effecting several revolutions. For a manual control over
the
entire control region of the displacement and support device, turning over of
the
controlling head is necessary.
An object of the present invention is a displacement and support device that
can be comfortably controlled manually with one hand over its entire control
region.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparently
hereinafter, are achieved by providing a displacement and support device for a
portable power tool and including a fluid-operated power cylinder, assembly
means
provided at one end of the power cylinder for connecting the power cylinder
with the
power tool; a support leg provided at another, opposite end of the power
cylinder, a
control valve for controlling operation of the power cylinder, and a manually
rotationally adjustable actuation member for actuating the control valve, with
the
actuation member being formed as a handle extending transverse to an axis of
the
power cylinder and rotationally adjustable about a handle axis within a
rotational
angle of 1800 and, preferably, 90 that encompasses the entire control region
of the
control valve.
With the entire control region of the control valve being within a rotational
angle of the actuation member of 180 or 90 , a comfortable control and
fixation of
the displacement and support device becomes possible, without a need to turn
the
controlling hand over and over again.
Advantageously, the continuously controlled control valve is formed as a
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CA 02415057 2002-12-23
rotary valve, which makes possible to continuously control, in a technological
simple
manner, the flow rate by adjusting the rotary position of the valve.
Advantageously, the power cylinder is formed as a double-action cylinder,
which provides for an easy withdrawal of the drill rod from the bore or hole.
Advantageously, the assembly means is formed as partially torsion-free bolt
connection element extending sideways on outside of the power cylinder and
transverse to the drill axis and through an eyelet provided on the power tool,
securing the power cylinder to the power tool. Within the bolt connection
element,
there is provided a fluid conduit through which fluid, which is fed through
the
pressure hose into the displacement and support device is fed to the power
tool.
The fluid, which enters the displacement and support device flows to the
conduit
through a junction.
Advantageously, the power cylinder is hydraulically operated in which the
water, which is necessary for cooling and flushing the drill bit, is used as a
pressure
medium.
Advantageously, the support leg, which can be formed as an elongate
member, is connected with the power cylinder by a claw member securable with a
cross-pin.
Advantageously, the support device includes a stirrup-shaped handle
rotatably and linearly displaceably mounted on the power cylinder, which
provides
for an easy transportation of the displacement and support device with two
hands.
The novel features of the present invention, which are considered as
characteristic for the invention, are set forth in the appended claims. The
invention
itself, however, both as to its construction and its mode of operation,
together with
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CA 02415057 2002-12-23
additional advantages and objects thereof, will be best understood from the
following detailed description of preferred embodiment, when read with
reference to
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the Drawings:
Fig. 1 shows a schematic view illustrating the use of a displacement
and support device according to the present invention;
Fig. 2 shows a cross-sectional view of a displacement and support
device according to the present invention along line II-II in Fig.
3; and
Fig. 3 shows a side view of a displacement and support device
according to the present invention.
DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT
Fig. 1 shows the use of a displacement and support device with a portable
power tool 1 used in underground mining and provided with a rotatably and
percussion driven, water-flushed, elongate drill 2. The displacement and
support
device is formed as power cylinder 3 that supports the power tool 1 against a
floor
and, simultaneously, applies to the drill 2 an acting in the operational
direction of the
drill 2, controlled displacement force. The power cylinder 3, which is
inclined
rearwardly, is manually guided and controlled by a user 5. Water is fed to the
working or power cylinder 3 through a pressure hose 6, and to the drill 2
through the
power tool 1.
The power cylinder 3, which is shown in Figs. 2-3, is formed as a
hydraulically
driven, double-action, power cylinder and is provided, at one of its end, with
an
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CA 02415057 2006-03-28
ANItNUtU SHtt I
assembly element 7 easily securable to the power tool I and, at another of its
end,
with a support leg 8. The power cylinder 3 is manually controlled by a control
valve
which is formed as a rotary valve. The operation of the control valve 10 is
controlled by a manually rotationally adjustable actuation member 9. The
actuation
member 9 is formed as a handle extending transverse to the axis A of the power
cylinder 3 and rotatable about the handle axis B. The actuation member 9 is
rotationally adjustable within a rotational angle of 180 .
The assembly element 7 is formed as a partially torsion-free bolt connection
element extending sideways transverse to the drill axis and through an eyelet
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to provided on the power tool 1, securing the power cylinder 3 to the power
tool 1.
Within the bolt connection element, there is provided a fluid conduit 11
through
which fluid, which is fed through the pressure hose 6 into the displacement
and
support device, is fed to the power tool 1. The fluid, which enters the
displacement
and support device, flows to the conduit 11 through a junction 12.
The support leg 8 is secured to another end of the power cylinder 3 by a claw
14 that can be tangentially withdrawn. The claw 14 is secured by a cross-pin
13. A
pivotable and linearly displaceable stirrup shaped handle 15 is provided on
the
power cylinder 3.
Though the present invention was shown and described with references to
the preferred embodiment, such is merely illustrative of the present invention
and is
not to be construed as a limitation thereof and various modifications of the
present
invention will be apparent to those skilled in the art. It is therefore not
intended that
the present invention be limited to the disclosed embodiment or details
thereof, and
the present invention includes all variations and/or alternative embodiments
with the
spirit and scope of the present invention as defined by the appended claims.
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Representative Drawing