US2094958A - Shield for arc lamp reflectors - Google Patents

Description

Oct. 5, 1937. p PARKER 2,094,958

SHIELD FOR ARC LAMP REFLECTORS Filed June 22, 1936 .2 Sheets-Sheet l awue/wtoo M. P. Parker.

Oct. 5, 1937. M. P. PARKER SHIELD FOR ARC LAMP REFLECTORS Filed June- 22, 1936 2 Sheets-Sheet 2 W p M Patented Oct. 5, 1937 t UNITED STATES PATENT OFFICE SHIELD FOR ARC LAMP REFLECTORS Maurice I. Parker, Fort Dodge, Iowa Application June 22, 1936, Serial No. 86,663

6 Claims. (01. 176-115) This invention relates to an improved shield for off until the arc reaches its maximum degree of the reflector of an arc lamp which in the present intensity will be prevented from striking the polillustration is the arc lamp of a motion picture ished surface of the reflectorand the reflector will projecting machine, and one object of the invennot become pitted or otherwise damaged. The

tion is to provide a reflector shield of such conshield may also be swung to the operative posistructionthat it may be mounted in the housing tion when adjusting the carbon. of a motion picture projecting machine and very In order to mount the shield sections for moveeasily moved into or out of shielding relation to ment from the shielding position shown in Figure the reflector. It is to be understood that a shield 2 by full lines to the inoperative position indiconstructed in accordance with this invention cated by dotted lines in this figure, there has been 10 may be used as a shield for the reflector of a provided mechanism by means of which the two search light, or any are lamp having associated shield sections are suspended and movably mounttherewith a reflector which should be protected ed. Each of the shield sections is secured to a from damage by bits of hot carbon thrown off bracket 5 having a vertically extending arm to carbon sticks of the lamp. I which the shield section is secured by screws or 15 Another object of the invention is to so conbolts 5' and an upper arm 6. The arms 6 of the struct and mount the shield that when it is in an two brackets extend forwardly at an upward inoperative position in front of the reflector, it will cline from the vertically extending arms and have entirely cover the reflector and thus prevent the their upper end portions 1 bent to extend horisurface of the reflector from becoming pitted or zontally and provide attaching portions which are 20 otherwise damaged by small particles of carbon secured by screws or equivalent fasteners 8 thrown off during adjustment of the carbon. against the upper faces of the rearwardly ex- Anether bject of the invention is to S0 co tending arms 9 of bell crank levers I0. These bell struct the means by which sections of the shield crank levers are formed with openings H to reare mounted that they may be very easily and ceive the pivot pins or bolts l2 and extend through quickly swung from a position in front of the rethe brackets l3 between upper and lower arms flectorto a position at opposite sides thereof where thereof. Rivets or equivalent fasteners l3 are they are disposed in advance of the reflectorv and provided for securing the brackets l3 against the Willhe entirely out Of the yunder face of the bridge portion of a main brack- The invention is illustrated in the accompanyet or hanger It. This hanger is an elongated 30 mg drawings, wherein bracket which extends transversely in the housing Figure 1 iS View en ve y through t e of a moving picture projecting machine and has improved Shield and reflector, t e Vi w being its arms I5 extending upwardlyin order that they along the line of Figure may be secured in an overhead position within Figure V s a w Showing the e to parthe projector housing against side walls l6 thereof 35 tially in rear elevation and partially in section. by screws or equivalent fasteners I1. Upper and Figure 3 is a view taken along the line 3-3 of lower spacers I8 and I9 are provided upon the Figure bolts I2 to maintain the bell-crank levers in prop- Figure 4 is a fragmentary p pective view of er spaced relation to upper and lower arms'of the one of the arms by means of which the shield secbrackets l3 whi h may b referred t a auxiliary 40 tions are movably mounted. brackets and these brackets are disposed diago- The p v d Shield constituting the j ctnally with respect to the main bracket or hanger matter of this invention is employed as means for M, as clearly shown in Figure 3 in order that Protecting the polished Surface of a eflector l ample room will be provided between these two of a moving p cture pr t n machine. The brackets to permit unobstructed movement by the 4D s d has companion t s 2 formed f h atbell crank levers. The arms 20 of the bell crank resisting material These Companion Sections 2 levers are formed with longitudinally extending are semi-circular in shape, as shown clearly in slots 2| through which extends a pivot pin or Figure and referring o t figure it w be Seen bolt 22 carried by the fork 23 of an operating bar F that abutting edges of e twO S t O S are re- 'or handle 24. A spacer 25 fits upon the bolt 22 CeSeed to form an Opening 3 through which the between the bell crank levers and, therefore, the carbon 4 extends when the two sections are swung bell crank levers may have free sliding and pivotto the operative position in front of the reflector. al movement relative to the bolt 22 when the bar .Therefore, when the current is first turned on, or handle 24 is shifted longitudinally of itself. A small particles of cut carbon which are thrown knob 25 is provided at the rear end of the bar in order that it may be easily grasped and shifted longitudinally and it will be understood that this bar is of sufficient length to project rearwardly from the housing or casing of the motion picture projecting machine.

When this device is in use, it is mounted in the casing or housing of the moving picture projecting machine and the hanger It secured to an overhead support which may be the side walls lb of the housing or any other convenient overhead support in the housing of the'moving picture projecting machine. The hanger is so mounted in the housing of the moving picture projecting machine that when the sections 2 of the shield are in the operative position shown in full lines in Figure 3, they will be disposed immediately in front of the reflector l in close proximity thereto. The shield forming sectionsare of such dimensions that the shield is slightly larger than the diameter of the reflector and, therefore, when the shield is in the operative position, it will en'- tirely cover the reflector and eliminate all danger of cut particles of carbon thrown off by the carbon scratching the polished surface, of the reflector. When the arc hasreached such'an intensity that particles of carbon are no longer thrown off and it is burning with a steady flame, the knob 26 is grasped and the bar or handle 24 brought rearwardly. This movement of the handle causes the bell crank levers to turn about the pivot pins or bolts l2 and the bracket to which the shield sections are secured will be swung forwardly towards sides of the housing of the moving picture projecting machine until they reach the position indicated by dotted lines in Figure 3. In this position, the shield sections will be disposed forwardly of the reflector and in such spaced relation to each other transversely of the housing that they will be out of the way and not constitute an obstruction which would prevent light from being properly projected forwardly by the reflector. When the shield is again needed, itis merely necessary to thrust the handle or bar forwardly to turn the bell crank levers about their pivots to the position shown in full lines in Figure 3 and the shield sections will be returned to the operative position in front of the reflector where they will entirely cover the reflector and form a small opening through which the carbon 4 extends.

Having thus described the invention, claimed as new is:

1. A shield for are lamp reflectors comprising a mounting supported in advance of a reflector, levers pivotally carried by said mounting for swinging movement in a horizontal plane, shield sections carried by said levers and movable therewith from an operative position in front of a reflector about a carbon to an inoperative position in advance of the reflector at opposite sides of the reflector and the carbon, and means for simultaneously imparting movement to said 1evers and shifting the shield sections into and out of an operative position.

2. A shield for arc lamp reflectors comprising a hanger having means for mounting the same in an elevated position in advance of a reflector and transversely of the carbon, bearing brackets carried by and depending from said hanger in spaced relation to each other laterally thereof at opposite sides of the carbon, shield sections adapted to fit about a carbon in front of a reflector and having meeting edges formed with registering recesses providing a passage to accommodate the carbon, supports for said shi ld sections exwhat is tending forwardly from the upper ends thereof at opposite sides of the carbon and pivotally mounted in said bearing brackets and having lever arms extending toward each other and overlapped, and an actuating element pivotally and slidably connected with the overlapped portions of the lever arms and movable to impart pivotal movement to the lever arms and supports and shift the shield sections forwardly from an operative position in front of a reflector to an inoperative position in advance of the reflector at opposite sides thereof. 7

3. A shield for are lamp reflectors comprising a hanger having means for mounting the same horizontally in an elevated position in advance of a reflector and transversely of a carbon, bearing brackets carried by said hanger in spaced relation to each other, shield sections adapted to fit about the carbon in edge to edge engagement with each other inv front of a reflector, supports for the shield sections extending forwardly therefrom and pivotally mounted in the bearing brackets and having arms extending towards each other transversely of the carbon between the bearing brackets and having overlapped portions formed with longitudinally extending slots, and an actuating member having a portion engaged through the slots of said arms and shiftable longitudinally of the carbon to impart movement to the arms and supports and shift the shield sections from an operative position in front of a reflector to an inoperative position in advance of opposite sides thereof.

4. A shield for are lamp reflectors: comprising a hanger having means for mounting the same in an elevated position in front of a reflector, bearing brackets carried by said hanger in spaced relation to each other, shield sections for fitting about a carbon in front of a reflector, supports for the shield sections each having a vertically disposed arm secured to a shield section and an arm projecting forwardly therefrom, bell crank levers pivotally mounted in the bearing brackets and having rearwardly extending arms secured to the forwardly extending arms of the supports, the bell crank levers also having forwardly extending arms slotted longitudinally and extending towards each other and overlapped, an actuating member shiftable longitudinally, and forks at one end of the actuating member carrying a pin extending through the slots of the bell crank levers whereby shiftingof the actuating member longitudinally in one direction will impart pivotal movement to the bell crank levers and swing the supports in a direction to move the shield sections from an operative position in front of a reflector to an inoperative position in advance of the reflector at opposite sides thereof.

5. A shield for are lamp reflectors comprising a hanger having means for mounting the same in an elevated position in front of a reflector, bearing members carried by said hanger in spaced relation to each other, shield sections for fitting about a carbon in front of a reflector, supports for the shield sections each having an arm projecting forwardly from a shield section, bell crank levers pivoted to the bearing members and having rearwardly extending arms secured to the forwardly extending arms of the supports and forwardly extending arms slotted longitudinally and extending towards each other and overlapped, an actuating member shiftable longitudinally, and a pin carried by said actuating member and extending through the slots of the bell crank levers whereby shifting of the actuating member longitudinally in one direction will impart pivotal movement to the bell crank levers and swing the supports in a direction to move the shield sections from an operative position in front of a. reflector toan inoperative position.

6. A shield for an arc lamp reflector comprising a support, coacting shield sections adapted to fit about a carbon in front of a reflector and constituting a guard between the reflector and the are producing end of the carbon, arms for said shield sections extending therefrom and pivotally connected with said support and provided with extensions projecting towards each other, and an actuating member having a portion pivotally and slidably connected with the extensions of the arms and being shiftable longitudinally of the carbon between the arms to impart pivotal movements to the arms and shift the shield sections laterally of the carbon from an operative position in front of the reflector to an inoperative position in advance of the reflector.

MAURICE P. PARKER.

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