U.S. patent number 3,647,142 [Application Number 05/083,025] was granted by the patent office on 1972-03-07 for air gun having a safety nozzle.
This patent grant is currently assigned to Scovill Manufacturing Company. Invention is credited to Edward H. Drude, Bennie Franklin Mangum.
United States Patent |
3,647,142 |
Drude , et al. |
March 7, 1972 |
AIR GUN HAVING A SAFETY NOZZLE
Abstract
The safety nozzle on this air gun has rearwardly directed bores
having oddly-shaped rearward openings to make plugging difficult.
Radial holes in a forward sleeve and a diametrically disposed pin
reduce dynamic pressures and noise levels.
Inventors: |
Drude; Edward H. (Raleigh,
NC), Mangum; Bennie Franklin (Garner, NC) |
Assignee: |
Scovill Manufacturing Company
(Waterbury, CT)
|
Family
ID: |
22175688 |
Appl.
No.: |
05/083,025 |
Filed: |
October 22, 1970 |
Current U.S.
Class: |
239/288.3;
239/419.5; 239/DIG.22; 239/518 |
Current CPC
Class: |
B05B
1/005 (20130101); Y10S 239/22 (20130101) |
Current International
Class: |
B05B
1/00 (20060101); B05b 001/28 () |
Field of
Search: |
;239/288,288.3,288.5,103,430,432,428.5,424,424.5,419.5,518,556 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Knowles; Allen N.
Assistant Examiner: Grant; Edwin D.
Claims
I claim:
1. A safety device comprising an air gun having a valve disposed
transverse to the passage of air through the gun and having a
nozzle mounting about the air outlet, a safety nozzle comprising a
tubular body having at one end attachment means complementing the
nozzle mounting and attached thereto, the body being formed with an
enlarged head on the other end and having a delivery passage
extending on the axis of the body from one end to the other and a
plurality of circularly arranged bores extending longitudinally of
the head and disposed about the passage and extending backward to
the rear face of the head, a tubular sleeve having one end snugly
embracing and attached to and extending outward from the head, the
sleeve having a plurality of openings therethrough adjacent the
head, and a pin disposed diametrically across the sleeve to partly
guard the head end of the delivery passage.
2. A safety device as described in claim 1 wherein the bores are
uniform and larger in diameter than the radial enlargement of the
head from the adjacent part of the body and portions of the bores
extend longitudinally into the adjacent part thereby presenting
holes which are difficult to plug.
3. A safety device comprising an air gun having a valve and having
a nozzle mounting having the air outlet, a safety nozzle comprising
a tubular body having at one end attachment means complementing the
nozzle mounting and attached thereto, the body being formed with an
enlarged head on the other end and having a delivery passage
extending on the axis of the body from one end to the other and a
plurality of circularly arranged bores extending longitudinally of
the head and disposed about the passage and extending backward to
the rear face of the head and continuing as channels in the portion
of the body behind the head, a tubular sleeve having one end
secured about and extending outward from the head, the sleeve
having a plurality of openings therethrough adjacent the head.
4. A device as described in claim 3 wherein a pin is disposed
diametrically across the sleeve to partly guard the head end of the
delivery passage.
Description
This invention relates to a safety air gun. More specifically, this
invention relates to an unusually effective safety nozzle which, at
the same time, provides acceptable dynamic output pressures and
noise levels.
With the air guns of the prior art not equipped with safety
features, air discharging from the gun nozzle has accidentally
propelled articles toward workmen causing injury. Injury has also
been involved in the use of nonsafety guns when a workman, horsing
around, has intentionally used the nozzle as a gun to project
objects toward fellow workmen, or has engaged the discharged end of
the nozzle with the skin or buried it in a body opening of a fellow
workman causing fatal or near fatal absorption of air into the
blood stream.
In the prior art, attempts to provide safety nozzles have simply
involved the formation of radial openings in a barrellike discharge
tube of the air gun. This expedient has not been effective in that
these openings have been rather easy to plug. Such nozzles have
had, in addition, the objectionable disadvantage that they have
been unduly long and many have had objectionably high dynamic
pressures emerging from the open end despite the provision of the
safety openings. High noise level has also been an objection.
In the embodiments of the present invention, unusually effective
safety means are provided in the form of rearwardly facing holes
which are virtually impossible to plug. Also provided are breakup
means cutting down the dynamic pressure emitted from the discharge
opening as well as reducing the noise level. With these advantages
is the additional benefit that embodiments under the present
invention may be much shorter than the safety nozzles of the prior
art.
Other objects and features will be apparent from the following
specification including the drawings all of which disclose a
nonlimiting example embodying the invention. In the drawings:
FIG. 1 is an elevation of an air gun equipped with a nozzle
embodying the invention;
FIG. 2 is an enlarged sectional view taken on the line 2--2 of FIG.
1;
FIG. 3 is an enlarged sectional view taken on the line 3--3 of FIG.
1; and
FIG. 4 is an enlarged longitudinal section of the nozzle.
Referring more specifically to the drawings, an air gun equipped
with a nozzle embodying the invention is generally designated 10 in
FIG. 1. The gun 12 comprises a housing 14 having an internal
passage connected to a hose H. The passage internally in the gun is
intercepted by a conventional transverse valve 16 and the passage
terminates in an internally threaded discharge opening 18 (FIG.
4).
The nozzle 20 comprises a tubular body 22 which at one end is
threaded as at 24 and engages the internal threads of the opening
18. The body is formed with an enlarged head 25 and a delivery
passage 28 extends axially through the body. A plurality of bores
30 are formed in the head 26 and arranged in a circular array about
the passage 28. Because the body is of reduced diameter leftward of
the head 26 (FIG. 4), the bores emerge as partly circular openings
where they intercept the shoulder 32 and form channels 34 in the
neck of the body which terminate in beveled surfaces 36.
A tubular sleeve 38 has one end snugly embracing the head 26 in a
press fit and extends out beyond the head for a distance as shown.
Radial openings 40 are formed in the sleeve 38 and a diametrically
disposed pin 42 is anchored in appropriate holes in the sleeve.
The advantages of the various features should be noted. An
essential feature is the rearwardly directed bores 30 which, as
they emerge rearward from the body 26, provide extremely difficult
orifices 32, 34, 36 to plug. Also, their rearward direction yields
the additional advantage that if the entire nozzle is buried in a
body opening, rearwardly directed air would emerge from the bores
30 with such force as to break any seal between the skin and the
nozzle or gun. Bores 30 as well as openings 40, of course, perform
an aspiration function.
Because the escape bores 30 are rearwardly directed, there is no
real necessity for great length as has characterized earlier air
gun safety nozzles. As a result, the present nozzle, made shorter,
operates at a considerably reduced noise level. Having the end of
the passage 28 close to the end of the sleeve 38 does not increase
substantially the dynamic pressure because of the provision of the
pin 42 which breaks up the direct shot of air and diffuses it. The
pin in turn does not increase the noise level because the openings
40 diffuse the shock waves.
The invention may be described in the following claim language:
* * * * *