US3049612A - Lighting apparatus in sewing machines - Google Patents

Description

ug- 1962 JUTA-RO SASAKI 3,049,612

LIGHTING APPARATUS IN SEWING MACHINES Filed June 29, 1959 2 Sheets-Sheet 1 Mil/5N TOR our/mo snsmq 1962 JUTARO SASAKI 3,049,612

LIGHTING APPARATUS IN SEWING MACHINES Filed June 29, 1959 2 Sheets-Sheet 2 7'- a: v (A 33 4", 24 nu A5 27 I INVENTOR JUTARO 3 SAKI r YUM/KM? 4w nited tates This invention relates to lighting apparatus in sewing machines.

In a known type of sewing machine, in which an electric lamp is mounted in the lower part of a drum near a machine base parallel with the direction of a machine head, that is, crosswise to .the direction of sewing, sutficient light can not be given to the sewing part, for the effective rays are only those coming from the head of the lamp in a slanting direction and those are disturbed by the sewers hand. Furthermore, a big casing for the lamp projecting firom the underside of the drum looks awkward.

The object of the present invention is to provide means to improve illumination in a sewing machine.

With this object in view, the present invention provides a lighting apparatus in a sewing machine, wherein at the lower part of a machine head near a front plate is formed a recess, with a casing therein fitted in such a way as to leave a space for a heat radiating chamber, and an electric lamp having a rotary switch is installed in the casing crosswise to the direction of the machine head, that is, in parallel with the direction of sewing.

According to the present invention, the lighting of the sewing part is greatly improved, for a lamp, which is removably mounted parallel with the direction of sewing and set in a casing fitted into a recess formed at the lower part of the machine head near the trout plate, casts all efiective rays down upon the sewing part, almost vertically and never interrupted by the sewers hand. In addtition, the lamp can be comparatively small, the mounting of a casing is easy, the switch is easily turned on and oif by turning a knob and overheating of the machine head can be prevented by the radiator chamber formed therein.

Other and the further objects of the present invention will become apparent from the following. specification and claims taken together with the accompanying drawings in which is shown the preferred embodiment of the lighting apparatus in a sewing machine according to the present invention.

FIG. 1 is an elevation of a sewing machine embodying the present invention.

FIG. 2 is a sectional plan view taken on the line 22 of FIG. 1.

FIG. 3 is an enlarged sectional side View taken on the line 33 of FIG. 1.

FIG. 4 is a sectional elevation taken on the line 4-4 of FIG. 3, and

FIG. 5 is a sectional elevation taken on the line 55 of a socket of which the cap is removed.

In these drawings reference numeral 11 indicates a machine head, at the lower part of which a recess 12 is formed near a front plate 13. Into the recess 12 is inserted a plastic casing 14 having a semicylindrical form, provided with front and rear portions 15 and 16, of which the from position 15 is fixed to the machine head 11 by a set screw 17. A socket 18 having therein a threaded receptacle for an electric lamp '19 is removably fitted in an opening made at the rear portion 16 so that the electric lamp 19 may be passed through the opening 20 and located in the casing 14 transverse to the direc- 3,049,612 Patented Aug. 14, 1962 tion of the machine head 11. Between the machine head 11 and the casing 14, which casing is provided with a reflecting plate 21, is formed a heat radiating chamber 22 having ventilation openings 23 to prevent the machine head 11 from overheating due to the heat of the electric lamp 19.

On a shaft 24 of a knob 25 is mounted a ratchet wheel 26 made of insulating material, provided with four arms 27, of which the alternate two are covered with metallic pieces 28 electrically connected with a spring contact piece 29 through flanges 30a on rivet 30 and through washer 30b. The inner ends of metallic pieces 28 wipe on washer 39b. A terminal 31 is electrically connected with the threaded receptacle 32, and terminal 34 is connected with spring 33. When the metallic pieces 28 come in contact with the spring 33, the electric circuit of the lamp 19 is closed from terminal 31 to terminal 34.

Power is supplied to terminals 31 and 34 through two prongs 35 frictionally fitting into sleeves 36, which sleeves are in turn connected to a source of power by wires (not shown) extending along grooves 37 in the top of semicylindrical casing 14 and through the opening 32 in the head 11. Thus the entire socket 18 can be easily and quickly unplugged from the casing 14 to change the lamp 19.

It is thought that the invent-ion and its advantages will be understood from the foregoing description and it is apparent that various changes may be made in the forms, construction and arrangement of the parts without departing from the spirit and scope of the invention or sactrificing its material advantages, the form hereinbefore described and illustrated in the drawings being merely a preferred embodiment thereof.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is:

1. In combination, a sewing machine head extending longitudinally of a sewing machine, said head having a downwardly opening semicylindrical recess adjacent the end thereof, said recess extending transversely of the longitudinal direction of said head, one end of said recess opening out of one side of said head, said head having a semicircular groove therein around the inside of said recess, a semicylindrical casing fitted into said semicylindrical recess, said casing having a closed end secured to said head at the closed end of said semicylindrical recess, the other end of said casing having an opening therethrcugh, said semicylindrical casing having a semicylindrical wall defining with said semicircular groove a ventilating chamber extending in a semicircle around said semicylindrical casing and opening out of said head at the sides of said semicylindrioal casing, said semicylindrical wall having at least one aperture therethrough opening into said ventilating chamber, a light socket removably fitted into said opening in the other end of said casing and having switch means thereon, and current conducting means on said socket and current conducting means on said semicylindrical casing engageable with each other.

2. The combination as claimed in claim 1 in which said socket comprises a threaded receptacle for a light bulb, a socket body having a recess therein in which said threaded receptacle is mounted, said socket body being the portion of the light socket which is removably fitted in said opening, and said means on said socket for placing it in electrical connection with said casing comprise a pair of prongs on said socket body, one in electrical connection with said threaded receptacle and the other in electrical connection with said switch means, said switch means being in electrical connection with said threaded recepta- References Ciied in the file of this patent UNITED STATES PATENTS 'Cha-son Dec. 23, 1930 Hohmann Nov. *1 8, 19'47 Langille Dec. 12, 1950 Singer et al May 27, 1952 Q wan .h, F

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