Exhaust assembly for a pneumatic sanding device

Details Exhaust assembly for a pneumatic sanding device Exhaust assembly for a pneumatic sanding device

2001-02-13

2002-09-10

Rachuba, M. (Department: 3723)

Abrading

Accessory

Guard or housing

C451S359000, C451S451000

Reexamination Certificate

active

06447387

ABSTRACT:

FIELD OF THE INVENTION
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
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
1
. 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
1
1
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.
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
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.
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.
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.


REFERENCES:
patent: 1560658 (1925-11-01), Bull
patent: 2219444 (1940-10-01), Eserkaln et al.
patent: 5027470 (1991-07-01), Takashima
patent: 5774992 (1998-07-01), Lindenmuth
patent: 5919085 (1999-07-01), Izumisawa
patent: 6293321 (2001-09-01), Chiang
patent: 6328643 (2001-12-01), Huber

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