US2890834A - Hot tinning lead gun - Google Patents

Description

June 16, 1959 c. T. MANGRUM ET AL 2,890,834

7 HOT TINNING LEAD GUN Filed April 3, 1958 3 -SheetsSheet l wllnlallllllllll GYTIl/an rum I Y aazvmz INV T0115 I 1 5- BY ATTORNEYS June 16, 1959 c. T. MANGRUM ET AL 2,890,834

' HOT' TINNING LEAD GUN Filed April 3, 1958 3 Sheets-Sheet 2 a 4-- IWA '7 CTTMa/n rum 6Y0, Ever-e22 IN NTORS 1 I I BY- 1,

ATTORNEYS.

June 16, 1959 c. MANGRUM ET 2,390,334

HOT TINNING LEAD GUN Filed April 5. 195a 3 Sheets-Sheet s i 5 I" I IIIIIIIII I14 I a g I l l I V I I l 1 I ,1

, 0.77m" rum I BY ATTORNEYS 2,890,834 Patented June 16, 1959 ice HOT TINNING LEAD GUN Clifford T. Mangrum and Cleaford 0. Everett, Stockton, Calif.

Application April 3, 1958, Serial No. 726,077

1 Claim. (Cl. 239-85) This invention relates toan apparatus known as a hot lead gun to be used in the hand of an operator, the apparatus or tool being designed for the application of hot lead in spray form, and particularly constructed for use in repairing motor vehicle bodies.

An important object of the invention is to provide an apparatus which is so constructed that the operator using the gun will have complete control over the distribution of the hot lead sprayed, and at the same time, an apparatus which will reduce the manpower hours or labor time to a minimum.

Another important object of the invention is to provide a self-contained tool of this character which includes a heating pot together with means for supplying air under pressure at the point of discharge of the heated liquified lead, resulting in the conversion of the hot lead into a fine spray for accomplishing the desired purpose, thereby eliminating the use of cold tinning compounds, with time-saving results.

Still another object of the invention is to provide an apparatus of this character which will eliminate lead dust during the application of the lead to a minimum, to the end that the apparatus may be operated with safety without the use of a face mask.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings:

Figure l is a side elevational view of an apparatus constructed in accordance with the invention.

Fig. 2 is a longitudinal sectional view through the apparatus.

Fig. 3 is a transverse sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a sectional View taken on line 55 of Fig. 2.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 2.

Fig. 7 is a sectional view taken on line 7--7 of Fig. 2.

Fig. 8 is a sectional view taken on line 8-8 of Fig. 2.

Fig. 9 is a sectional view taken on line 99 of Fig. 2.

Fig. 10 is a transverse sectional view taken on line 10-10 of Fig. 11.

Fig. 11 is a sectional view taken on line 11--11 of Fig. 10.

Fig. 12 is a fragmental elevational view illustrating the cam operating valve rod controlling the flow of air into the lead pot of the device.

Referring to the drawings in detail, the apparatus includes a body portion indicated generally by the reference character 5 and, as shown, is elongated horizontally and provided with an open bottom and open ends.

Extending into the body portion 5, is a bar 6 which 2 has its side edges contacting the inner surfaces of the body 5,. where the bar is secured in position by means of bolts 7 and 8.

As better shown by Figure 2 of the drawings, the forward end of the bar 6 extends beyond the front end of the body 5, where it provides a support for the burner chamber 9 which is held in place on the bar 6 by means of a bolt 10 which is shown as extending through an opening in the bar 6 with its threaded end secured within a threadedbore formed in the bottom of the burner chamber 9. 1

The burner chamber 9 provides a support for the lead pot 11, the bottom of which rests directly on the burner chamber 9, as clearly shown by Figure 2 of the drawings, so that the heat from the burner, chamber will maintain the lead contained in the lead pot, in liquid state for conversion into a fine spray for distribution on the surface to be repaired.

A lead outlet nozzle 12 is provided in the base of the lead pot 11, the nozzle being provided with a valve seat on which the valve 13 engages to control the flow of molten lead from the lead pot.

The valve 13 is formed on the inner end of the valve rod 14, which extends through a leak-proof valve rod guide 15 which is located in the wall of the lead pot 11.

The rod 14 is substantially long and extends through an opening 14 in one end ofthe bell crank lever 16 where it is held in place by nuts 15' threaded on the end; of rod 14. The bell crank lever 16 has pivotal connection with the arms 17 that are secured to the body 5 by means of bolt 18, the arms 17 supporting the bell cranklever 16 in a position beyond the rear end of the body 5.

The other end of the bell crank lever indicated at 19 is offset as shown by Fig. 3 of the drawings, and is provided with a downwardly extended ear 20 that has pivotal connection with the upper end of the valve rod 24 that operates adjacent to a valve housing 22.

The valve rod 24 is provided with a cam member 49 that moves over a valve rod 21 which extends into said valve housing 22 and rests against ball valve 46 normally held seated by the spring 50, the rod 21 unseating said ball valve when moved to the limit of its inward movement releasing air into pipe 30 and nozzle 32 to be hereinafter more fully described.

A manually controlled valve 51 regulates the flow of air into valve 22 from the air line 25. The operating rod 24 extends along the outer surface of the air line 25 that supports the valve housing 22 at its upper end, as shown by Figure 2.

The operating rod 24 has pivotal connection with one end of the bell crank lever 26, the bell crank lever being pivotally supported on the hollow handle 27 that rests against the lower edges of the side walls of the body 5, as shown by Figure 2 of the drawings.

One end of the bell crank lever 26 provides the trigger for the gun, and is indicated by the reference character 28, the trigger 28 being so arranged that when the handle 27 is gripped, the fingers of the operator may grip the trigger 28 to move the same in unseating the air valve 46 and lead control valve 13, simultaneously.

A pipe indicated by the reference character 29 connects with the air line 25, the pipe 29 also being in communication with a suitable source of compressed air supply, not shown.

Communicating with the valve housing 22, is a pipe 30 that extends into the valve housing and has its discharge end 31 formed into a nozzle 32 which rests directly on the floor of the lead pot 11, with the nozzle disposed so that it will discharge air under pressure upwardly and forwardly to cause molten lead to be discharged through the outlet nozzle 12 in a fine spray, according to the adjustment" of" the valve" 13;

The pipe 33 is the fuel line -for the gun, and connects with a suitable source of fuel supply, not shown. The

. of the-pipe 35 extending through an opening in the wall" of" the burner chamber" 9,- where it is disposed directly under the bottom of the lead put 11, to supply heat to the lead pot" to maintainthe lead in a= molten condition.

The burner'charnber 9=is provided with the usual. openings38 disposed atthe base thereof toadmit oxygen to the burner 37.

A-l'so connectedi with* the pipe.- 34 is apipe 39 that ex tendslaterallyfrom the pipe 34- and provides a support for the pipes 40' on which theflame thrower burners 41 are-supported, the flame thrower burners being so located that they-wi1l preheat the metal under treatment, for in stanfi t-inning, while the nozzle .12 sprays the' molten lead on the hot surface, under treatment.

The pipe 39 is supported by means of the bracket 42 that is secured to thelower surface of the. bar 6, the bracket 42 being inthe form ofa metal band or loop on which the pipe 39 rests.

The pipes 40 whichextend laterallyfrom one end of the pipe 39, are supportecL by the bracket 43; which is also in the form-of ab'and secured to the lower surface of-' 'the bar 6 and on whichthe pipes 40 rest.

Thereference character 44 indicates: a shield plate which is so arranged that itw-ill shieldthe operators hand; which is grippingthe-handle 27 and operating the trigger 28, againstthe heat generated by the burners of the apparatus.

A guard 45' is" secured to the outer surface of th burner chamber 9 and is spaced a substantial distance from the forward wall thereof toregulate the draft of air entering the burner chamber 9;

Valve 52 controls the passage of fuel to the burner 37, while valve 53 controls the flow of fuel through pipe 39-to-theburners4-1= It might be further stated that the lead pot 11 is provided with a conventional cover 46' to prevent accidental displacement of the molten lead from the pot, during the operation of the mechanism.

From the foregoing it will be seen that due to the construction shown and described; I have provided an ap paratus for heatingrandwmaintaining-ileadused in repairing motor vehicle bodies, in a molten state, together with manually controlled valves for controlling the discharge of the molten lead through the discharge nozzle to accurately position the molten: lead in a spray. form.

The tool is self-contained and exceptionally convenient for operation.

Having thus described the invention, what is claimed 1s:

A self contained apparatus for heat tinning a metal surface and applyingrlead-in a fine spray to the heat tinned surface, comprising an elongated body, a lead pot having-a discharge nozzle mounted on the forward end of said" body, a burner chamber directlyunder said lead pot, a burnerextendinginto said burner chamber heatihg'lead contained in said lead 'pot-g an airnozzle extending into said lead pot adjacent to said discharge. nozzzlefor'directingair underpressureto'said discharge nozzle of said lead pot converting molten lead issuing from said discharge nozzle. into a fine spray, a handlesecured to thebottom of said body for effecting mani'pulatio'n of said apparatus, and mechanism including a trigger mounted on said handle, gripped by the operator for controlling the: discharge of" molten'lea'd from said lead pot'and simultaneously directing air under pressure into: the flow ofi molten lead converting the moltenlead into a'fine' spray;

References Cited" in the file ofthis patent UNITED STATES PATENTS Taylor Nov., 14, 193.31 Miller. Feb. 13, 19.51.

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