Information
-
Patent Grant
-
6631855
-
Patent Number
6,631,855
-
Date Filed
Thursday, May 10, 200123 years ago
-
Date Issued
Tuesday, October 14, 200320 years ago
-
CPC
-
US Classifications
Field of Search
US
- 239 526
- 239 302
- 239 320
- 239 321
- 239 333
- 239 354
- 239 359
- 239 375
- 239 378
- 239 DIG 14
- 239 569
- 239 5812
- 239 5821
- 239 583
- 239 5851
- 222 333
- 222 183
- 222 105
- 222 107
- 222 108
-
International Classifications
- B05B702
- B05B901
- B05B1102
- A62C1362
- A62C1366
-
Abstract
A structurally improved spray gun includes a hollow housing having a hollow handle, an electromagnet in the housing to acturate an oscillating armature which repeatedly impinges a piston in a cylinder to aspirate the paint from a container into the cylinder to spray out to the atmosphere through a nozzle at front of the cylinder. It is characterized in a locking device which is disposed in the housing beneath the cylinder to lock or unlock the cylinder in a rapid and convenient manner.
Description
BACKGROUND OF THE INVENTION
The present invention relates to spray guns and more particularly to a locking device for spray gun which device facilitates a rapid positioning and readily disassembling of a cylinder inside the spray gun.
Typical spray gun
1
(as shown in
FIG. 1
) comprises a container
2
, a lid
3
, a cylinder
4
and a electromagnet
5
inside the housing to actuate an oscillating armature
6
to force a piston
8
moving forward so as to aspirate the paint inside the container
2
into the cylinder
4
spraying out to the atmosphere through a nozzle
11
. An adjustable anvil
7
on the right side of the oscillating armature
6
to adjust the oscillating extent of the armature
6
. The electromagnet
5
is controlled by a press button
10
. Because of the lid
3
is integrated with the cylinder
4
, the lid
3
must be secured to the bottom
12
of the housing by screws
9
prior to the assembly of the cylinder
4
into the housing. It is known that after finish of a job, a certain amount of paint may congeal in the cylinder
4
. To clean the congealed paint, the cylinder
4
must be disassembled by unfastening a plurality of screws
9
. This is wearisome job and waste time.
U.S. Pat. Nos. 3,680,789 and 3,899,134 all adopt fastening means that difficult to assemble or disassemble. And U.S. Pat. Nos. 2,999,646 and 3,445,068 also have the disadvantage of integration of the lid with the housing. It causes more difficult to remove the cylinder out of the spray gun to clean up.
Recently, some of the producers adapt threaded cylinder. But it is still inconvenient.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide a structurally improved spray gun in which a locking device is provided to facilitate a rapid assembling and/or disassembling the cylinder into the housing of the spray gun and the assembly is rather stable.
Accordingly, the structurally improved spray gun of the present invention comprises a hollow housing with a handle, an electromagnet in the housing operated by a pressbutton switch, an oscillating armature pivoted to a rear side of the electromagnet which actuates the armature to make oscillatory action, an adjustable anvil to control the oscillatory span of the armature, a cylinder disposed in side the housing in which is an elastic no-return cork in front end and an elastic piston in rear end, a nozzle at front end of the cylinder and a lid integrated with the bottom of the cylinder to engage with a container containing the paint. When the armature impinges the piston to move forward, the paint is aspirated from the container into the cylinder and sprayed out to the atmosphere through the nozzle. This disclosure is characterized in that a locking device is provided in the housing make incorporation with the check blocks on the outer periphery of the cylinder so as to facilitate a rapid assembly and/or disassembly of the cylinder into the housing and the assembly is rather stable.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a vertical side view to show a spray gun according to a prior art,
FIG. 2
is a vertical side view and partially sectional view to show a spray gun of the preferred embodiment according to the present invention,
FIG. 3
is an exploded perspective view to show a cylinder and a locking device,
FIG. 4
is a top plane view to show the relationship between the cylinder and the housing,
FIG. 5
is a vertical side view to show the assembly of the spray gun of the present invention,
FIG. 6
is a front view of the spray gun of the present invention,
FIG. 7
is a top view to show the assembly of the cylinder with the housing and the locking device,
FIG. 8
is a front view and partially sectional view to show the locking device locked the cylinder,
FIG. 9
is a front view and partially sectional view to the locking device unlocked the cylinder,
FIG. 10
is an exploded perspective view to show an alternate locking device and an alternate cylinder, and
FIG. 11
is a front view and partially sectional view to shown the alternate locking device at a locked position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to
FIGS. 2
to
5
of the drawings, the spray gun of the present invention comprises a hollow housing
20
having a hollow handle
20
A, an electromagnet
21
in the housing
20
operated by a press button switch
24
in the handle, an oscillating armature
22
pivoted to a rear side of the electromagnet
21
and actuated by the electromagnet
21
to perform oscillatory actions, an adjustable anvil
23
which is operated by a swing button to move forward or backward to control the oscillatory span of the armature
22
, a cylinder
30
integrated with a internally threaded lid
31
disposed into the housing
20
having in rear end a piston
32
biased by a coil spring
33
and in front end a no-return cork
34
biased by a spring
35
, a nozzle
36
screw fastened to the front end thereof, a return pipe
37
and a out pipe
38
spacedly formed under the cylinder
30
and communicated with the cylinder
30
and a container
40
which is screw fastened to the lid
31
for containing the paint. The housing
20
further has an opening
25
in front end integrated with a receiving groove
251
and a rectangular groove
252
(as shown in
FIG. 6
) and a positioning guide
26
.
It is characterized that a locking device
50
is adapted to lock the cylinder
30
inside the housing
20
. The locking device
50
is of a inverse U-shaped section and has a positioning aperture
51
in a lateral portion
54
to receive a spring
52
which has other end disposed on a post
27
on an inner wall of the housing
20
and a button
53
on the other side opposite to the aperture
51
disposed in a thru hole
28
(as shown in
FIGS. 7
,
8
and
9
). The locking device
50
is elastic because of the spring
52
and stable because of the positioning guide
26
. On a lateral periphery of the cylinder
30
, there is a first stop block
301
and a second stop block
302
engageable into the rectangular groove
252
and defined a gap
304
therebetween receivable with the lateral portion
54
of the inverse U-shaped locking device
50
, the second stop block
302
has a beveled surface
303
in order that the second stop block
303
can readily pass over the lateral portion
54
which is than engaged into the gap
304
because of the resilience of the spring
52
. Therefore the cylinder
30
is firmly locked up without moving transversely. To prevent an inadvertent touching, the button
53
of the locking device
50
is embedded into the thru hole
28
of the housing
20
. When presses the button
53
inward, the lateral portion
54
moves laterally to disengaged with the gap
304
. So that the cylinder
30
together with the lid
31
enables to draw out of the housing
20
. The locking or unlocking of the cylinder
30
is rather rapid without any tool.
In operation, the oscillating armature
22
actuated by the electromagnet
21
performs continuous oscillation to impinge against the piston
32
to move forward and the resilience of the coil spring
33
immediately forces the piston
32
to move backward so that the repeated sliding movement aspirates the paint into the cylinder
30
and then sprays out to the atmosphere through nozzle
36
.
Referring to
FIGS. 10 and 11
of the drawings, an alternate embodiment of a locking device
60
is provided, the locking device
60
has a vertical rectangular bar
64
, an aperture
61
in the top of the bar
64
for engaging one end of a spring
62
which has the other end secured on a post
205
centrally formed on the inner surface of an upper wall of the housing
20
and a sliding button
63
perpendicularly connected to the bar
64
through a transverse rod. To coordinate with, a first stop block
301
′ and a second stop block
302
′ now is formed on the top periphery of the cylinder
30
to replace with the stop blocks
301
and
302
, a gap
304
′ is also defined between the blocks
301
′ and
302
′ to replace with the gap
304
and is engageable with the bar
64
of the locking device
60
. Further, the second slop block
302
′ has also a beveled surface
303
′ and in the housing
20
, a rectangular groove
252
is moved to the top of the receiving groove
251
and re-designated as
202
, the thru hole
28
is now becoming an oblong hole
204
and the positioning guide
26
is now moved to the center of the housing
20
and re-designated a
26
A.
When assembling, slide the cylinder
30
into the housing
20
through the receiving groove
201
and the rectangular groove
202
, the second stop block
302
′ will be smoothly passed the rectangular bar
64
of the locking device
60
because of the beveled surface
303
′ so that the rectangular bar
64
will be automatically engaged into the gap
304
′ for the resilience of the spring
62
. Therefore, the cylinder
30
is firmly locked up. When slides the sliding button
63
upward to have the rectangular bar
64
moving up to disengage with the gap
304
′, the cylinder
30
is readily drawn out of the housing
20
.
The specification relating to the above embodiments should be construed as exemplary rather than as limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.
Claims
- 1. A locking device for a spray gun comprising:a hollow housing having a hollow handle, an electromagnet in the housing operated by a pressbutton switch in the handle, an oscillating armature pivoted to a rear side of the electromagnet and actuated by the electromagnet to perform oscillatory actions, an anvil on a rear end of the housing operated by a swing button to move forward and backward for controlling the oscillatory span of the armature, a cylinder integrated with a internally threaded lid disposed into the housing, a container screw fastened to the lid, an out pipe and a return pipe spacedly formed under the cylinder and communicating with the cylinder and the container, a piston inserted into rear end of the cylinder biased by a first spring means, a no-return cork disposed in front end of the cylinder biased by a second spring means, a nozzle screw fastened to the front end of the cylinder, an opening in front end of the housing integrated with a receiving groove and a rectangular groove therein, said rectangular groove positioned at a lateral side of the opening, a post on an inner surface of a side wall of the housing, a thru hole in a side wall of the housing opposite to the post and a positioning guide formed on an inner surface of the side wall of the housing beside the thru hole; said cylinder further having a pair of first and second stop blocks spacedly formed on an outer periphery toward the post defined a gap therebetween and with the second stop block having a beveled surface; a locking device of inverse U-shaped section disposed into the housing under the cylinder having a first lateral portion including an aperture in an outer surface for engaging with a third spring means which has an outer end disposed on the post and a second lateral portion including a pressbutton disposed into the thru hole opposite to the third spring means; said first lateral portion of said U-shaped locking device being engageable into the gap when the cylinder is sliding in place into the housing.
- 2. A locking device for a spray gun comprising:a hollow housing having a hollow handle, an electromagnet in the housing operated by a pressbutton switch in the handle, an oscillating armature pivoted to a rear side of the electromagnet and actuated by the electromagnet to perform oscillatory actions, an anvil on a rear end of the housing operated by a swing button to move forward and backward for controlling the oscillatory span of the armature, a cylinder integrated with a internally threaded lid disposed into the housing, having a first and a second stop blocks spacedly projected on a top to define a gap therebetween with the second stop block having a beveled surface, a container screw fastened to the lid, an out pipe and a return pipe spacedly projected downward from the cylinder and communicating to the cylinder and the container, a piston inserted into rear end of the cylinder biased by a first spring means, a no-return cork disposed in front end of the cylinder biased by a second spring means, a nozzle screw fastened to the front end of the cylinder, an opening in front end of the housing integrated with a rectangular groove on top of the opening, a post projected downward from an inner surface of a top wall of the housing directed to the gap of the cylinder including a positioning guide on lateral sides thereof and an oblong hole in a side wall of the housing; a locking device disposed into the housing above the cylinder having a rectangular bar engageable into the gap and slidable in the positioning guide, said bar having an aperture in a top for receiving one end of a third spring means which has other end disposed on the post and a sliding button slidably disposed outside of the oblong hole and connected to the bar through a transverse rod.
US Referenced Citations (5)