U.S. patent application number 09/781257 was filed with the patent office on 2002-08-15 for exhaust assembly for a pneumatic sanding device.
Invention is credited to Tseng, Ming-Qun.
Application Number | 20020111127 09/781257 |
Document ID | / |
Family ID | 25122158 |
Filed Date | 2002-08-15 |
United States Patent
Application |
20020111127 |
Kind Code |
A1 |
Tseng, Ming-Qun |
August 15, 2002 |
EXHAUST ASSEMBLY FOR A PNEUMATIC SANDING DEVICE
Abstract
An exhaust assembly of a sanding device includes a first passage
and an extension tube which are respectively defined in a hosing of
the casing of the sanding device. The hosing has an inlet and an
outlet. The first passage communicates with the outlet and inlet,
and the extension tube extends from the hosing. The extension tube
is engaged with an annular cover which communicates with the
sanding pad and has an exhaust tube. A control valve is rotatably
received in the first passage to block or open the outlet or the
extension tube. A bag or a vacuum cleaner can be connected to the
exhaust tube of the annular cover to collect sanding powder or
sanding debris.
Inventors: |
Tseng, Ming-Qun; (Yuanli
Jen, TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
25122158 |
Appl. No.: |
09/781257 |
Filed: |
February 13, 2001 |
Current U.S.
Class: |
451/358 ;
451/456 |
Current CPC
Class: |
B24B 23/03 20130101;
B24B 55/102 20130101 |
Class at
Publication: |
451/358 ;
451/456 |
International
Class: |
B24B 023/00; B24B
027/08 |
Claims
What is claimed is:
1. A sanding device comprising: a sanding pad connected to an
underside of a motor shaft balancer and a power assembly connected
to a top of said motor shaft balancer, said sanding pad having
holes defined therethrough; an annular cover mounted to said motor
shaft balancer and an exhaust tube extending from said annular
cover, said sanding pad connected to said annular cover and said
holes in said sanding pad communicating with an interior of said
annular cover; a casing engaged with said annular cover and a
hosing extending from said casing, an inlet and an outlet
respectively defined through said hosing and communicating with an
interior of said casing, a first passage defined in said hosing and
communicating with said outlet, an extension tube extending from
said hosing and communicating with said first passage and said
outlet, said extension tube engaged with said annular cover, and a
control valve rotatably received in said first passage and having a
first section and a second section, a through hole defined radially
through said first section and a notch defined in an outer
periphery of said second section, said first section located to
block said extension tube and said second section located to block
said outlet.
2. The device as claimed in claim 1 further comprising an L-shaped
connection member which has a first end inserted in said extension
tube and a tunnel defined through said connection member, a second
end of said connection member communicating with said exhaust tube
of said annular cover, a guide member connected to a lower end of
said connection member and located in said exhaust tube.
3. The device as claimed in claim 2 wherein said guide member is a
tapered member.
4. The device as claimed in claim 1 further comprising an engaging
recess defined in an inner periphery of a top of said annular cover
and communicating with said exhaust tube, said extension tube
engaged with said engaging recess.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a pneumatic sander which
has an exhaust assembly with a control valve to change the passages
in the assembly so as to guide the powder during grinding to
desired position.
BACKGROUND OF THE INVENTION
[0002] A conventional pneumatic grinding device 10 is shown in
FIGS. 1 and 2, and includes an annular cover 17 which is connected
to an underside of a body 11 and a motor shaft balancer (not shown)
is rotatably received in the body 11. A sanding disk or sanding pad
16 is driven by the motor shaft balancer and located at an
underside of the annular cover 17. A block 14 extends radially
outward from the body 11 and an inlet 12 and an outlet 13 are
respectively defined through the block 14 and communicate with an
interior of the body 11. Pressurized air is introduced into the
body 11 via the inlet 12 and flows out from the outlet 13. A tube
171 extends from the annular cover 17 and a communication tube 18
is connected between the outlet 13 and the tube 171 so that the
exhaust air flow will suck the sanding powder from the
communication tube 18 and being collected in a bag 181 connected to
the outlet 13. FIG. 3 shows another type of sanding powder
collection system and includes an auxiliary tube 19 which has a
collar 190 mounted to the block 14 and a seal 191 seals the outlet
13. The auxiliary tube 19 is connected to the tube 171 and has an
open end which is connected to a hose of a vacuum cleaner 192. By
this way, the sanding powder is sucked by the vacuum cleaner 192
via the auxiliary tube 19. Therefore, the sanding device has three
way to deal with the sanding powder, one of which is to blow the
power from the outlet 13 together with the exhaust air flow, the
second is to cooperate with a bag 181 as shown in FIG. 2, and the
third way is to connect a vacuum cleaner 192 as shown in FIG. 3 to
suck the power. The users have to choose specific items to be
connected to the block 14 or the tube 171 whichever the bag 18 or
the vacuum cleaner 192 are to be used. Each way of collecting the
sanding powder involves a lot of parts and takes time to install or
disengage from the sanding device.
[0003] The present invention intends to provide an exhaust assembly
that has a control valve which is rotated to change the passages to
let the exhaust air flow go through the designated passage.
SUMMARY OF THE INVENTION
[0004] In accordance with one aspect of the present invention,
there is provided an exhaust assembly of a sanding device and
comprising an annular cover mounted to the motor shaft balancer and
a sanding pad is connected to the motor shaft balancer. An exhaust
tube extends from the annular cover and holes are defined in the
sanding pad and communicate with an interior of the annular cover.
A casing is engaged with the annular cover and a hosing extends
from the casing. An inlet and an outlet are respectively defined
through the hosing and communicate with an interior of the casing.
A first passage is defined in the hosing and communicates with the
aid inlet and the outlet. An extension tube extends from the hosing
and communicates with the first passage and the outlet. The
extension tube is engaged with the annular cover. A control valve
is rotatably received in the first passage and has a first section
and a second section. A through hole is defined radially through
the first section and a notch is defined in an outer periphery of
the second section. The first section is located to block the
extension tube and the second section is located to block the
outlet.
[0005] The primary object of the present invention is to provide an
exhaust assembly for a sanding device wherein the sanding device
can be cooperated with a dust bag or a vacuum cleaner by rotating
the control member.
[0006] These and further objects, features and advantages of the
present invention will become more obvious from the following
description when taken in connection with the accompanying drawings
which show, for purposes of illustration only, several embodiments
in accordance with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a bottom view to show a conventional casing of a
sanding device;
[0008] FIG. 2 is a cross sectional view to show a dust bag is
connected to the conventional sanding device;
[0009] FIG. 3 is a cross sectional view to show a vacuum cleaner is
connected to the conventional sanding device;
[0010] FIG. 4 is a perspective view to show the exhaust assembly
and the sanding device of the present invention;
[0011] FIG. 5 is an exploded view to show the exhaust assembly and
the sanding device of the present invention;
[0012] FIG. 6 is a top cross sectional view to show the control
member is positioned to communicate the outlet and the annular
cover;
[0013] FIG. 7 is a side cross sectional view to show the situation
as illustrated in FIG. 6;
[0014] FIG. 8 is a top cross sectional view to show the control
member is positioned to communicate the annular cover and the
extension tube;
[0015] FIG. 9 is a side cross sectional view to show the situation
as illustrated in FIG. 8;
[0016] FIG. 10 is an exploded view to show another embodiment of
the exhaust assembly of the present invention wherein a connection
member is inserted in the extension tube;
[0017] FIG. 11 is a cross sectional view to show a dust bag is
connected to the collection tube on the exhaust tube and the
connection member is received in the extension tube;
[0018] FIG. 12 is a top cross sectional view to show the control
member is positioned to block the extension tube and the
outlet;
[0019] FIG. 13 is a side cross sectional view to show the situation
as illustrated in FIG. 12;
[0020] FIG. 14 is a cross sectional view to show a vacuum cleaner
is connected to the collection tube wherein the control member is
located to communicate the extension tube and an interior of the
casing, and
[0021] FIG. 15 is a cross sectional view to show the control member
is located to communicate the extension tube and an interior of the
casing as shown in FIG. 14.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0022] Referring to FIGS. 4 and 5, the sanding device of the
present invention comprises a sanding pad 26 connected to an
underside of a motor shaft balancer 25 and a power assembly 24
connected to a top of the motor shaft balancer 25. The sanding pad
26 has holes 28 defined therethrough and an annular cover 27 is
mounted to the motor shaft balancer 25, wherein the holes 28
communicate with an interior of the annular cover 27. An exhaust
tube 271 extends from the annular cover 27 and an engaging recess
270 is defined in an inner periphery of a top of the annular cover
27 so that the engaging recess 270 communicates with the exhaust
tube 271. The sanding pad 26 is connected to the annular cover 27
and exposed to an underside of the annular cover 27.
[0023] A casing 21 is engaged with the annular cover 27 and
receives the power assembly 24 in the casing 21. A hosing 210
extends from the casing 21 and an inlet 22 and an outlet 23 are
respectively defined through the hosing 210 and communicate with
the interior of the casing 21. A first passage 231 is defined
transversely in the hosing 210 and communicates with the outlet. An
extension tube 232 extends from the hosing 210 and communicates
with the first passage 231 and the outlet 23. The extension tube
232 is engaged with the engaging recess 270 of the annular cover
27. A collection tube 30 is connected to the exhaust tube 271 so as
to be connected a dust bag 31 as shown in FIG. 11 or a vacuum
cleaner 33 as shown in FIG. 14.
[0024] A control valve 40 is rotatably received in the first
passage 231 and has a first section 44 and a second section 42. A
through hole 43 is defined radially through the first section 44
and a notch 41 is defined in an outer periphery of the second
section 42. The first section 44 is located to block the extension
tube 232 and the second section 42 is located to block the outlet
23.
[0025] FIGS. 6 and 7 show that when the sanding device is used to
send the sanding powder in the annular cover 27 from the outlet 23,
the second section 42 blocks the extension tube 232 so that the
exhaust air flow passes through the notch 41 and flows out from the
outlet 23.
[0026] FIGS. 8 and 9 show that when the sanding device is used to
be cooperated with the dust bag 31 connected to the collection tube
30, the control member 40 is rotated to let the second section 42
block the outlet 23 and the exhaust air flow from the annular cover
27 is guided into the extension tube 232 and the sanding powder
goes into the dust bag 31 via the dust bag 31.
[0027] FIGS. 10 and 11 show that an L-shaped connection member 50
which has a first end inserted in the extension tube 232 and a
tunnel defined through the connection member 50. A second end of
the connection member 50 communicates with the exhaust tube 271 of
the annular cover 27. A tapered guide member 51 is connected to a
lower end of the connection member 50 and located in the exhaust
tube 271. The control member 50 is rotated to let the second
section 42 block the outlet 23 and the air flow enters the exhaust
tube 271 to suck sanding powder in the annular cover 27 to enter
the exhaust tube 271 and to be collected in the dust bag 31. The
guide member 51 guides the air flow from the interior of the
annular cover 27 to the exhaust tube 271 and the collection tube
30.
[0028] FIGS. 12 to 15 show that the control member 40 is rotated to
open the outlet 23 and block the extension tube 232, and a vacuum
cleaner 33 is connected to the collection tube 30. Accordingly, the
exhaust air flow goes out from the outlet 23 and the vacuum cleaner
33 also sucks the sanding powder in the annular cover 27.
[0029] The sanding device of the present invention can be easily
change the functions by rotating the control member 40 to cooperate
with a dust bag 31 or a vacuum cleaner 33 without changing any part
or adding any par.
[0030] While we have shown and described various embodiments in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.
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