US1331355A - Electric-lamp lock - Google Patents

Description

F. J. ONEILL.

ELECTRIC LAMP LOCK.

APPLICATION FILED AUG.I2. 191B- Patented Feb. 17, 1920.

UNITED STATES PATENT OFFIGE,

FREDERICK JOSEPH. ONEILL, OF DUNEDIN, NEW ZEALAND.

ELECTRIC-LAMP LOCK.

Application filed August 12, 1918.

To all whom it may concern:

Be it known that I, FREDERICK JOSEPH ONnnzn, a subject of King George V of Great Britain, residing at 40 Bowling street, Dunedin, in the Dominion of New Zealand, have invented certain new and useful Improvements in Electric-Lamp Locks, of which the following is a specification.

The main object of this invention is to prevent the unlawful removal of an electric lamp from a bayonet joint fitting.

Other objects accomplished by the means I adopt to prevent the unlawful removal of the electric lamp, are; prevents arcing between the spring contacts in the socket member of the bayonet fitting and the contacts on the face of the spigot end of the bayonet joint member; prevents end play in the bayonet joint of an electric lamp, considerably reduces vibration and oscillation of the lamp in its socket, and thus generally increases the efliciency of the lamp.

In a loose bayonet fitting the spring contacts do not prevent arcing; frequently thelamp oscillating in one direction or another disengages one or another of the spring contacts in the bayonet socket and causes arcing, creating heat in the fitting; this effects the temper of the spring contacts, and considerably reduces the efiiciency of the lamp.

In the drawings accompanying this specification,

Figure 1 is a perspective view of the lamp lock.

Fig. 2 is a perspective view of an electric lamp showing the lamp lock loosely applied to the bayonet joint connection as it would appear before being clenched thereon.

Fig. 3 is a view showing the lamp lock applied to the bayonet joint connection, and clenched thereon.

I take a strip 1 of suitable material, preferably metal, approximately 351- long, by e or one quarter of an inch wide, and form a circle as in Fig. 1, of approximately one inch in diameter, to fit the spigot end 2 of the bayonet fitting on the lamp 3, one end of the strip 1 is crimped as at 1*, while the other end is slightly bent as at 1 to adapt it to engage with the crimp 1*.

It will be observed that when the lamp 3 is connected up, that is, the spigot end 2 of the bayonet joint which is on the lamp 3 en- Specification of Letters Patent.

Patented Feb. 17, 1920.

Serial No. 249,517.

gages with the socket member 4 of the bayonet joint, a groove 5 is created between the edge 1 of the socket member f of the said joint and the enlarged portion 2 of the spigot member 2 of the said joint, the space which creates the groove 5 being necessary for the engagement and disengagement of the lamp with the electric light fitting.

I apply the strip 1 having the crimp end 1 and the bent end 1 to the groove 5 in the bayonet joint, engage the bent end 1 of the strip 1 in the crimp 1 as in Fig. 2, and with a pair of pliers or any suitable tool clench the bent end 1 within the crimp end 1 and bend them over approximately flush with the socket member 4 0f the joint, as in Fig. 3.

The strip 1 closes up the groove 5 and prevents end play of the lamp in the socket 4: against the influence of the spring contacts in the socket member 4 of the bayonet joint, thus preventing the removal of the lamp, also considerably reduces oscillation and vibration of the lamp.

WVhat I claim as new and desire to secure by Letters Patent is 1. An electric lamp lock. comprising in combination with a lamp having its base formed as a shouldered spigot member and a socket member connected to said spigot by a bayonet joint, a metal strip applied to the space formed by the spigot and socket members in connected position, said strip engaging the inner edge of said socket member and shoulder of said spigot member.

2. An electric lamp lock. comprising in combination with a lamp having its base formed as a shouldered spigot member and a socket member connected to said spigot member by a bayonet joint, a metal strip applied to the space formed between the shoulder of said spi ot and the end of the socket member when connected, said metal strip having its ends fashioned in a manner to permit said ends to be clenched together after the said strip of metal has been applied.

3. An electric lamp lock. comprising in combination with a lamp having its base formed as a shouldered spigot member and a socket member connected to said spigot member by a bayonet joint, a metal strip engaging the inner edge of said socket member and the shoulder of said spigot, the strip set my hand in presence of two subscribing having one end crimped and the other end Witnesses.

adapted to en a 'e the said crimp and When -1 engaged both ei ids are adapted to be bent FREDBJRICK JOSEPH O NEILL over and lie approximately flush with the Witnesses: outside surface of the bayonet joint. ROBERT WALLS, V

In testimony whereof I have hereunto ROBERT PARK, Jnr.

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