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1,232,638
The bar 13 carries a heat shield 23 which is interposed between the electrodes and the clutch mechanism to protect the latter from the heat of the are. While I have herein shown and particu- larly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without de- io parting from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Pat- ent the following 1. An arc lamp including a holder for i5 the upper electrode; a vertical guide bar along which the holder may descend; a clutch carrier pivotally mounted upon the guide bar; a clutch pivotally mounted upon the clutch carrier, the axes of movement of 29 the clutch carrier and clutch being trans- verse with respect to each other; a bell crank lever mounted upon the guide bar; a spring
also mounted upon the guide bar and oper- ating upon one end of the bell crank lever; and a rod whose upper end is engaged by 25 and is operated upon by the other end of the bell crank lever and whose lower end en- gages the clutch carrier. 2. An arc lamp including a holder for the upper electrode; a vertical guide bar along 30 which the holder may descend; a clutch car- rier pivotally mounted upon the guide bar; a clutch pivotally mounted upon the clutch carrier, the axes of movement of the clutch carrier and clutch being transverse with re- 36 spect to each other; a rod engaging the clutch carrier; and a spring pressing the rod upon the clutch carrier.. In witness whereof, I hereunto subscribe my name this 6th day of July A. D. 1915. 40 THERON H. WILLIAMS. Witnesses: WM. A. Ross, HARRY P. BAYLEY.
Copies of this patent may be obtained for five cents each, by addressing the, "Commissioner of Patents, Washington,.D. C."