GB191315576A - Improvements in Locking Electric Lamps. - Google Patents

Abstract

15,576. Hubbell, H. April 9, [Convention date]. Caps; leading-in wires. - A cap comprises outer and inner sleeves 20, 19, the latter being fixed on the bulb, and the two sleeves being connected in such a way that the lamp can be inserted in a holder, but cannot be removed without first separating the parts 19, 20 longitudinally and thereby breaking a leading-in wire. In the form shown, one leading-in wire 15 is kinked so as to break easily, and is soldered &c. to a metal tube 17 passing loosely through an insulating-button 18, the other leading-in wire being connected to the sleeve 19. A flange 24 on the tube 17 rests on a number of washers 25 on top of the button 18, which itself rests on the top of the cap 20. Upturned prongs 22 on the tube 17 are embedded in a preferably square insulating - washer 23 secured in the sleeve 19 by resilient projections 33. A flange 26 on the cap 20 engages a shoulder 27 on the sleeve 19 after breaking the wire 15. The sleeve 19 is provided with a spring secured in the middle to form two arms 35, 36, Fig. 6; the arm 35 engages, an indentation 37 in the cap when introducing the lamp, a second indentation vertically under the other co-operating with the arm 36 to enable the lamp to be removed. The engaging surfaces of the indentations are oppositely directed. The washer 23 is released from the projections 33 by the separation of the parts 19, 20, the projections remaining bent so as to abut against the washer and prevent re-engagement of the broken ends of the wire 15. The space between the parts 19, 20 is closed by a flange 40 on the sleeve 19 to prevent tampering.