US 2020352 A
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Description (OCR text may contain errors)
Patented Nov. 12, 1935 UNITED STATES PATENT OFFICE 3 Claims.
This invention relates to improvements in a switch and particularly in a switch of the type used on small flashlights.
A primary object of this invention is to provide an improved device of the above nature wherein a member, adapted to receive a light bulb, may be rotated to perform the function of a switch for said bulb.
Another object of this invention is to provide a device of the above nature, wherein the construc.
tion may be noted for its simplicity and compactness.
Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of one form of the present invention is clearly shown.
In the drawing:
Fig. 1 is a sectional view on line I-I of Fig. 2;
Fig. 2 is a longitudinal sectional View on line 2 2 of Fig. 1;
Fig. 3 is a sectional view on line 3-3 of Fig. 4, showing the light bulb receiving member rotated in contact position.
Fig. 4 is an outside view of a ilashlight embodying the present invention.
In the drawing, I2 designates a tubular metal casing closed at one end, and adapted to receive a dry cell I9, a spring 20 and a subassembly comprising a light bulb I 0, bushing I4, retaining washers I1 and I8, a resilient member I6, and a socket II.
The light bulb I is axially guided in socket I I by a non-conducting bushing I4 and held in place by non-conducting eccentric washers II and I8. Bushing I4 and washers I1 and I8 are pressed into socket II. Resilient member I6 is laterally compressed within socket II, and is so shaped as to provide a spring contact 24 which bears on the threaded portion of bulb I0 when switch is making contact; the resilient member I6 has another portion of its body formed into a semi-spherical projection 22 which slips thru an opening 2| in socket I I and slides into an internal annular groove I5 formed in casing I2.
Socket II may be readily removed from casing I2 by applying an axial pull of sufficient force to overcome the pressure exerted by the resilient member I6 against the inner surface of groove I5.
It will be noted that the resilient member I6 also serves the purpose of preventing socket II from falling out of casing I2 thru the constant engagement of projection 22 in annular groove I5.
In the Off position, projection 22 enters into 5 cavity I3 formed in annular groove I5 of casing I2, thereby allowing spring contact 24 to retract from threaded portion of bulb I0 and break contact.
While the form and embodiment of the pres- 10 ent invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.
What is claimed is as follows:
1. In a switch of the class described, the combination comprising; a tubular member having an internal annular groove partially deepened on its circumference; a circular resilient current carrying member having a portion of its body extending into said groove, said resilient member having another portion of its body adapted to bear against the external cylindrical metallic portion of a light bulb; means for rotating said resilient member including a socket adapted to receive and insulate said bulb.
2. In a switch of the class described, lthe combination comprising; a tubular member closed at one end, adapted to receive a dry cell, means for establishing contact between the dry cell and said tubular member, said tubular member having lan internal annular groove partially deepened on its circumference; a circular resilient current carrying member having a portion of its body extending into said groove, said resilient member having another portion of its body adapted to bear against the external cylindrical metallic portion of a light bulb; means for rotating said resilient member including a socket adapted to receive and insulate said bulb.
3. In a switch of the class described, a socket comprising; a rotatable sleeve adapted to receive a guide for a light bulb, a retainer for said bulb including two eccentric washers overlapping each other and of a thickness suitable to provide a receptacle for threaded portion of said light bulb, a space between said guide and said retainer to allow free movement of a current carrying member.