A paint-spray nozzle for marking trees


Material Information

A paint-spray nozzle for marking trees
Physical Description:
Downs, Leslie E
Forest Products Laboratory (U.S.)
University of Wisconsin
United States Dept. of Agriculture, Forest Service, Forest Products Laboratory ( Madison, Wis )
Publication Date:

Record Information

Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 29512388
oclc - 757708875
System ID:

Full Text

January 1952


W | or b

i O To19 792
No. IPI 9 4

Madison 5, Wisconsin
In Cooperation with the University of Wisconsin

Digitized by the Internet Archive
in 2013


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Construction of Nozzle

The nozzle is made of hexagonal brass bar stock, 1/h inch across the flats and
is approximately 2 inches long. .5s most saill drills are short, it is diffi-
cult to drill an accurate bore of this length. For this reason, the nozzle
was made in parts a, b, and c (fig. 1).

The bore of part a was drilled with a .o. 60 drill. This part of the nozzle
serves merely as a tube to conduct the paint to pirt b. The bore should be
kept sm al, however, because a larger bore would hold enough paint and Freon
to force paint from the tip of the nozzle after the valve lever is released.

Parts b and c were drilled with a .o. ''0 drill. .ven with parts as short as
these, i was necessary to rotate the part in an accurate lathe and drill
halfway from each end with a drill held in a chuck mounted in the tailstock.

after thIe bores were drilled, the ends were beveled out sli jhtly with a larger
drill to facilitate the insertion of a small wire for cLeaning.

Parts a and b were fitted with _oth male and female machine-screw threads,
size 6-32. Part c was threaded with male t-reads so that it could be screwed
into either part a or part b. Thus, -arts a and c, or parts b and c, can be
used alone.

For appearance, the end of part c -- actually the tip of the nozzle -- wvas
tapered to a conical shape. The hexagonal corners of parts a and b 'iere
rounded off to a 1/4-inch diameter near the male threads to provide clearance
between the nozzle ..rid the spray cap.

>,e small hole in the spray cap was drilled out and taped with 6-32 machine-
screw threads, so that the mr.e end of parts a or L couid be att ched (d, fig.
1). The surface was end-:illed "uo fit flat against the nozzle washer.

fiber washers were used as g skots to prevent pain leakage at the joints.
iThese w shers were about 1/32 inch thick nd i/4 inch in diameter. They fit
snugly over the 6-32 threads. Three such washers are needed for each nozzle.

washers of suitable size may be obtained at radio or electrical supply houses.
They can be m de by drilling a I/h-inch fiber rod with a "o. 28 drill and
slic in off washers of the correct t;..ckness with a narrow p.rtint tool.

s embhly of Nozzle

Nozzle parts a, b, and c are screwed together with a washer in each joint.
T v, nozzle is then screwed into the tapped-out spray cap. The third washer
is used to seai this joint.

A pair of sm-ll, open-end wrenches should be used to tighten or loosen the
vrrious p -rta, out thie, should oe used with discretion because it is easy to
strfp the thre'ads of the brass parts or of the spray c .pT. The use of wrenches
not over I or 1-1/2 inches long, may reduce "ie dionger of applying too much
tO) Ye.

lReort No. R1914


Use andI Care of the "c "

Us*r-. the Noz7,1

': can should be held with trie nozzle tip close to th tr- e il' ". rro.w line
is desired. .2'.. n the vaive is o.: the ; can shoald be moved fairly r jaidly
w.ile tho m'rt., is bein. forf -, oth rwise phe, paint mfly bo, d s l. o
think.l tlat it will run. Care0 should be ten nott t, ouchr. the tre, or the
nozzle or spray cap y te d'm -_.;-d.

Cleanin and Storace

A piece of vrire, .13 inchl. in diameter or m: hlier, is useful to clean the
nozzle il it bJeCcomes clo, >ud. >iire t'.is small is not verv c fj.on, but it can
b: obtained. Stoel srrinr vwiro or !.- no vwir ;.'ith a dia:> tet of approximatel[
0.009'5 inch is used at th La ,or -Atnry.

Toen s:pr' ing is discontinued for a f -,; hors or loni1r, it is dvi ,sable to
run the v.uire throe nczzlr. .-I dl' .it te '-'is k c *jaanpol
open f',r ":ture u;e. it is recerinded that th; end of the v;ire be tziste d
int:'. a ioop and a strin, or taL tiUd To i- to :void losin- Lt.

'lurpentine or other paint toirncrs or sv b:nts 5] li 1d freely to clear
the nr szle parts. Tiur-cert2,o or o)aint tn0nnr 0 nay also bLe used to cle('ai the
spray cp, but other sol e...s, sc s be:';on or tono mV soft or de-troy
the flexibiE r'ube.r or 9 .oprei' di ......r,.,g :n ith cap,

i, cans should be stored 1n nr. i ert<.d sositin, so that any p 'rnt that
settls vdill not clxo th op:'. end 01 the internal metal tube.
Immerndiately before use te cr sod e 'rd over to its non, 1 isitin
t ,nora] ition
and shalkeln vi" r ,l~'l- .tll" 1"t
and shaken vior ous until t1 < r,'_'t l a-[i ,t'or2 s ;.li f'and in suc, c oer
rattle freey.


Report .:D, Iq191U

Figure 1 --Special tree-marking nozzle for pressurized paint cans,
A, can with nozzle in place, By parts of nozzle
shown in finished and longitudinal section views, are
made of hexagonal brass bar stock, Part a was drilled
with a No. 60 drill; parts b and c with a No. 80
drill. The hole in spray cap d was drilled and tapped
out with a 6-52 machine-screw thread. Threads of a,
b, and c are also 6-52, Washers of hard fiber,
about 1/52 inch thick and 1/4 inch in diameter and
drilled with a No, 28 drill, are inserted between the
three nozzle parts and between the nozzle and can.

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