US 2124039 A
Description (OCR text may contain errors)
July 19, 1938. D. MITCHELL ET AL I TONGS FOR REMOVING RADIO TUBES FROM CHASSIS Filed March 18, 1936 R N ou m Telf N Nha R EC Vtww mm A Y C 1f Y l* B Mm. D u) A Ml.
Patented July 19, 1938 UNITED STATES PATENT OFFICE SSIS Douglas Mitchell and Charles Adney Wyeth, New
York, N. Y., assignors to American Radio Hardware Co. Inc., New York, N. Y.
Application March 18, 1936, Serial No. 69,482
Our invention has reference to tongs \f.or removing metallic type oi tubes from chassis. The metallic tubes at present in use for radio purposes are rather small for a perfect grip by 5 hand; also, the type of radio set in use at present leaves very little room for a perfect grip of the tube, and it is impossible to grip such a tube with the bare hand right after the current has been shut off. as the tubes get very hot. l In addition, the type of sockets used for such lamps call for a rather tight fit, and it requires a powerful pull to remove such a lamp from a chassis. Since there is no direct access from the top but only from the sides, it is rather a l problem to remove such tubes from the chassis. The purpose of our invention is to obviate this and provide a device which is simple in construction and permits it toget hold of the tube and jack it out of the chassis, from a point outside the cabinet in which the chassis is located.
The object of the invention is to provide a simple and eiilcient device that will accomplish the above purpose.
In the appended drawing forming part of this application, Figure 1 is a side elevation of. tongs embodying our invention. Its application is shown to a metallic tube and chassis, both of which tube and chassis are shown in dash and dot lines. Figure 2 is an elevation of Figure 1 in the direction of the arrow 2, and
Figure 3 is a section on line 3-3, Figure 1.
Referring to the drawing, 5 are the curved jawswhich are preferably eachcovered with a rubber pad 6, so as not to injure a tube when gripping it. Each jaw is carried by an arm 'l rising from the jaws 5. 'I'he arms 'I have extensions 8 bent at substantially right angles to the arms but running in the same direction and are inter-connected by a pivot 9 forming the fulcrum oi the tongs. One of the extensions 8 is bent downward, as shown at I0, to space the said extensions 8 of the tongs and the other extension is offset laterally to permit a proper grip on the handles II provided on the extensions 8.
A slide I2 is mounted on one of. the arms 'I. The movement of the slide on the arm is guided by two pins I3 provided on the arm and projecting through slots I4 of the slide I2. A spring I5 normally tends to retract the slide to its normal or raised position.
The slide l2 at its upper end has a recess I6 engaged by a projection I1 of an arm I6 fulcrumed also at the pivot 9 of the tongs. The
other end of the arm I8 has a recess 20 engaged by a projection 2| of an arm 22 pivoted at 23 on the extensions 8 on which the arm I8 is located. Said arm 22 extends into the proximity of the handles II and thereat is provided with a flattened portion 24 easily engageable by a finger of the hand gripping the handles.
The two jaws 5 are normally maintained separated by a spring 25 provided between the extensions 8, as best shown in Figure 2. When it is desirable to remove a tube or bulb 26 from a chassis 21 (see Figure l), the tongs are brought iirst into engagement with the tube, and it will be noted from Figure l that the lower end 28 of the slide I2, although extending below the jaws 5 of. the arm l, provides a suicient clearance between said end and the surface of the chassis, so that there would be no interference between this lower end of the slide and the chassis when the jaws are brought into engagement with a tube.
By applying pressure to the handles II, the jaws 5 will be brought into engagement with the tube 26 through the fulcrum 9, as illustrated in Figure 1. If then pressure is applied to the attened end 24 of the arm 22, the same is caused to move on its pivot 23, and as it travels to the position indicated in dot and dash lines of Figure 1, the arm I8 is caused to move on its pivot 9 to the dash and dot lines as indicated in said Figure 1, thus forcing the slide I2 to descend and come into engagement with the surface of the chassis 21, yand as the slide moves to the position indicated in dash and dot lines in said Figure 1, it jacks the tube 26 out of the chassis, which can then be removed by the tongs still gripping the tube.
It is evident that the lever arrangement provided is a form of toggle joint for 'the slide to be operated from the handles. The jaws 5, being designed to engage a cylindrical body, necessarily have for an axis the axis of a cylinder that may be engaged therebetween.
We claim 1. In combination, tongs having jaws, arms rising from said jaws so that a radio tube can be accommodated between the arms when the tube is engaged by the jaws, handles extending from said arms substantially at right angles thereto, and whereby said jaws may be actuated, a slide carried by one of said arms, means for operating said slide from the proximity of the handles, and means for restoring said slide to its normal position.
2. In combination, tongs having jaws for engaging a radio tube, arms rising from said jaws so that a radio tube can be accommodated therebetween when engaged by the jaws, an extension from each arm substantially at right angles thereto, each provided with a handle, a fulcrum for said tongs on the extensions ofl the arms, a slide mounted on one of said arms. a spring' i'or normally maintaining said slide in a. retracted position, a lever engaging said slide and having its fulcrum in the iulcrum of the tongs, and a second lever engaging the rst lever to be operated from the proximity oi the handles, and whereby said slide can be moved substantially as and for the purposes set forth.
3. In combination, tongs having jaws, arms rising fromsaid jaws so that a radio tube can be accommodated between the arms whenthe tube is engaged by the jaws, handles extending from said arms substantially at right angles thereto, a
is engaged by the jaws, handles extending from said arms substantially at right angles thereto and whereby said Jaws may be actuated, a slide carried by one of said arms, and a toggle Joint engaging the slide and operable from the proximity of the handles for actuatingsaid slide.
DOUGLAS MITCHELL. CHARLES .ADNEY WYETH.