US1768299A - Switch - Google Patents

Description

O. SIMON 1 June 24, 1930.

SWITCH Filed June '7. 1928 Gist a2 Jzznorv.

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I QM! Patented June 24, 1930 UNITED STATES OSCAR SIMON, F KINCAID, ILLINOIS SWITCH Application filed June 7, 1928. Serial No. 283,570.

The present invention is directed to improvements in switches.

The primary object of the invention is to provide a switch of this kind more particu- J larly designed for use in connection with radio receiving sets, the construction being such that the set can be operated with a long, medium, or short antenna.

Another object of the invention is to pro- 1 vide a switch of this kind wherein a single knob is employed for moving a plurality of contact arms for selective engagement with a plurality of contacts.

Another object of the invention is to provide a device of this kind so constructed that when the set is inactive all antennae will be in circuit with the ground wire for protection against lightning.

l/Vith these and other objects in view, this 29 invention resides in the novel features of construction, formation, combination and arrangement of parts to be herinafter more fully described, claimed and illustrated in the accompanying drawing, in which Figure 1 is a plan view of the device. Figure 2 is a sectional view on line 22 of Figure 1.

Figure 3 is a diagrammatic View showing the switch in use in connection with the antennae.

Figure 4 is a similar view showing another position of the switch.

Figure 5 is a diagrammatic view of the modified form of the invention. Referring to the drawing, 1 designates a plate of suitable insulating material which has fixed thereto sides 2 of similar material, said sides being adapted to be secured to a panel or other part of a set, as desired.

The plate is provided with a bearing 3 in which is journaled a bolt 4, said bolt having its threaded end extended through a facing block 5 which rests upon the plate. A knob is threaded upon the bolt 6, and clamped between the block and knob is a plate 7 having a group of radially disposed contact arms 8, 9 and 10 carried thereby, and an independent contact arm 11 an ularly disposed with respect to the group 0 arms.

The arms are preferably formed from sheet metal and are of a resilient nature to assure a tight contact.

In order to hold the knob against wobbling, a coil spring 12 encircles a bolt 4 and is interposed between the plate 1 and head of said bolt, as clearly shown in Figure 2 of the drawing.

Engaged in the plate 1 are grouped contact heads 12, 13 and 14, the shanks thereof having threaded thereon binding posts 15, 16 and 17, respectively. Contact heads 18 and 19 are also carried by the plate 1 and are provided with binding posts 20 and 21, respectively. The latter heads are diametrically disposed and are spaced some little distance from the grouped contact heads 12, 13 and 14, the purpose of which will be apparent.

Leading from the post 19 is a ground wire 22 and also leading therefrom to the set is a conductor 23. The post 20 has leading therefrom and connected to the set a conductor 24.

The numerals 25, 26 and 27 indicate, respectively, a short, medium and long antenna which have lead in wires 28, 29 and 30 which are connected to the posts 15, 16 and 17, respectively.

As shown in Figure 1 of the drawing in full lines the contact arms 8, 9 and 10 are in contact with the heads 12, 13 and 14, whereas the arm 11 is in contact with the head 19, and when in this position the contact arms are all grounded and the set is inactive owing to the fact that no contact is made with the head 18. As shown in dotted lines the contact 10 is engaged with the head 18, thus positioning the arm 11 for engagement with the head 12 thus placing the set in circuit with the short antenna 25. Obviously the knob 6 can be turned to move the arm 11 in contact with the head 13 and the arm 10 in contact with the head 18 thus connecting the set with the medium length antenna. Of course when the arm 10 engages the head 14 and the arm 8 engages the head 18 the long antenna will be connected. It will thus be seen that the knob can be turned to selectively place the set in 7 circuit with antennae of various length.

In Figure 5 the switch is shown used in connection with devices other than radio sets, and in this instance, like in the pre terred form of the invention the contact heads 31, 32 and 33 and the contact heads 3%, 35 and 36 are arranged in independent groups in order that the contact arms can be selectively engaged therewith, the heads of the latter group being in circuit with a common wire 37, whereas the heads of the other group are in circuit with wires 37, 3S and 39.

I claim:

A switch of the class described, comprising contact heads arranged in a group, a pair of independent contact heads, a group of contact arms and an independent contact arm, and means for moving the group of arms into engagement with thefrespective contact heads oi the grouped heads and for successively moving the arms of the group into engagement with one of the independent contact heads and the independent arm successively into engagement with the heads of the group, the group of arms and independ ent arm being angularly disposed, whereby all of the grouped arms will engage the grouped contact heads when the independent arm is engaged with an independent contact head.

In testimony whereof I affix my signature.

OSCAR sIMoN. [a 5.]

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