US2183846A

US2183846A - Electrode holder

Info

Publication number: US2183846A
Application number: US171873A
Authority: US
Inventors: Wilbur A Robb
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-10-30
Filing date: 1937-10-30
Publication date: 1939-12-19
Anticipated expiration: 1956-12-19

Description

Dec. 19, 1939. w. A. ROBB v ELECTRODE HOLDER Filed Oct. 30, 19s? Patented Dec. 19, 1939 ;UNITED STATES PATENT OFFICE ELECTRODE HOLDER- Wilbur A. Robb, Huntington Park, Calif. Y Application October so, 1937, .SerialNo. 171,873

-7 Claims. (01. 176-119)" My invention relates to electrode holders, and more particularly to holders for carbon electrodes for motion picture projecting machines.

An important object of the invention is to providemeans for holding such a carbon electrode until it is almost completely consumed. Under present practice, carbon electrodes, that have been used for about three or four-reels of moving picture film, often have to be thrown away even though there is still suflicient carbon left to last for another reel of film.

The reason for this lies in the construction and arrangement of carbon holders on motion picture projecting machines now in general use. It is an object ofmy invention to provide a carbon holder that will reduce this waste to a minimum, whereby considerable saving can be effected by moving picture theaters in the quantity of carbon electrodes utilized in the operation of their projection machines.

Still another object is to provide such a holder for the positive carbon of a motion picture proj ection machine, which carbon is consumed faster than the negative one.

The invention also comprises novel details of construction and novel combinations and arrangements of parts, which will more fully appear in the course of the following description.

In the drawing, like reference characters designate similar parts in the several views.

Figure l is an elevation of an electrode carrier of a motion picture projection machine, to which carrier has been applied my electrode holder.

Figure 2 is a section through a stem of my holder, taken on the line 22 of Figure 1, looking in the direction of the arrows.

Figure 3 is a section through my holder, taken on the line 3-3 of Figure 1, looking in the direction of the arrows.

Figure 4 is a section through my holder, taken on the line fl4 of Figure 1, looking in the direction of the arrows. b

Figure 5 is a bottom view of my electrode holder.

Figure 6 is a perspective view of my electrode holder.

Figure '7 is-a perspective view of a portion of a motion picture projection machine.

Referring more in detail to the drawing, the reference numeral I designates a support on a motion picture projection machine for a positive carbon electrode holder. A fixed jaw 8 is mount- ,ed on the support, while a movable jaw 9 is disposed in clamping arrangement with the jaw 8.

An aperturejd block. H is mounted on the support 7 at therear of the jaws.8,. 9.

A sleeve 12 onithe support provides a bearing for a handle l3. The handle is connected to operate the movable, clamping jaw 9. An arm I 4 on' 5 the support! maintains the sleeve I2 on the support in relatively fixed position. The handle l3 and the sleeve l2 have-a threadedv engagement (not shown). I

A conductive cable vIi": is connected with the 10 support 1, to conduct positive electrical current to the holder. l

A stationaryelectrode guide I6 has a notched top. I! for directing positive carbon electrode l8 as it is-fed forward into operative association 15 with a negative carbonelectrode [9. An ash receiver 20 isdisposed beneath the ends of the two electrodes l8, Hi, to catch ashes falling therefrom.

The support, Tis a movable support, to feed forward the positive carbon electrode. Conventional parts of a motion picture projection machine are illustrated in relatively light, unshaded lines, in the drawing. Since the details of construction of. the ordinary motion picture projection machine are well known in the trade,'further .illustration and description are deemed unnecessary.' I

My holder, generally designated it], includes a stem 22 that is substantially square insection. The rear end of the stem 22 is inserted in the requir,e.side openings Zlto be cutout at the sides 28 of the head 24. These side cut-away portions 21 are of sufiicient size for a cylindrically shaped carbon electrode in the holder Ill to be either fiush with the sides 28 of the head, or to extend beyond the sides 28. The function of this arrangement is that the carbon electrode I 8 may thereby ride against the surfaces of the notch I1 even though my holder is employed.

Continuing rearward from the recess 26, the head 24, the collar 23 and the stem 22 have a continuous slot 29.

In the use of my invention, when a carbon electrode has been used until its length has been substantially reduced, the end of the remainder is inserted into the recess 26 and the rear end of the stem 22 is inserted in the aperture in the block It. The split, forward end of the stem aperture in the block H and the forward end of is disposed between the

jaws

8, 9. Rotation of handle l3 causes the movable jaw 9 to be moved toward the fixed jaw 8, thus clamping the portions of the split end of the holder about the end of the carbon electrode. The pressure of the movable jaw upon the split end places the latter under pressure, thus maintaining my holder in place.

It will be noted that my holder does not interfere with the carbon seating in the notch 11, for the carbon engages the notch ll'through the slots 21.

When the holder Ii! has been fed forward to its limit (as shown in broken lines in Figure 1), the collar 23 engages the outer face of the guide l6, thus preventing further forward movement of the support 1.

While I have illustrated and described what I now regard as the preferred embodiment of my invention, the construction is, of course, subject to modifications without departing from the spirit of my invention. 1, therefore, do not wish to restrict myself to the particular form of construction illustrated and described, but desire to avail myself of all modifications which may fall within the scope of the appended claims.

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

1. In a motion picture projection machine having a guide for an electrode and having a movable support for feeding the electrode while being directed by the guide, a holder on the support, and a member on the holder for receiving the electrode, the member being arranged to move along the guide during advancing movement of the support, and a side of the member being cut away sufficiently for the portion of the carbon within said member to ride directly on the guide during said advancing movement of the support.

2. In a motion picture projection machine having a guide for an electrode and having a movable support for feeding the electrode while being directed by the guide, a holder on the support, and a member on the holder for receiving the electrode, the member substantially conforming with the shape of the guide and being arranged to advance along the guide during advancing movement of the support, and a side of the member being cut away for the carbon to ride directly on the guide during said advancing movement of the support.

3. In a motion picture projection machine having an angularly notched guide for an electrode and having a movable support for feeding the electrode while being directed by the guide, a holder on the support, and an angularly shaped member on the holder substantially conforming with the shape of the notch in the guide and being arranged to advance along the guide during advancing movement of the support, and the angularly arranged faces of the member being cut away for the carbon to ride directly on the guide during said advancing movement of the support.

4. In a motion picture projection machine having a guide for an electrode and having a movable support for feeding the electrode while being directed by the guide, a holder on the support, a collar on the holder arranged to engage the guide and thereby limitthe movement of the holder, and means on the holder for gripping an end of an electrode, said means being arranged ahead of the collar and being disposed to move along the guide.

5. In a motion picture projection machine having a guide for an electrode, having a movable support for feeding the electrode while being directed by the guide, and having relatively fixed and movable jaws, a holder on the support, a collar on the holder arranged to engage the guide and thereby limit the movement of the holder, a head on the holder shaped to move along the guide until the collar engages same, the head and collar being split and the portion of the holder at the end of the split being of unitary construction to provide resilience to the holder, the head being recessed to receive the end of an electrode, and the holder being arranged between the fixed and movable jaws of the machine for said jaws to clamp the split head upon an end of an electrode.

6. In a motion picture projection machine having a guide for an electrode and having a movable support for feeding the electrode while being directed by the guide, a holder on the support for receiving the electrode, the holder being arranged to move along the guide during advancing movement of the support, the holder having a recess to receive an electrode and the recess having an opening in a side thereof, and an electrode disposed in the recess and extending through the opening in the side of the recess at least to the outer surface of the holder.

'7. In a motion picture projection machine having a support for progressively feeding an electrode and having a guide provided with a differently shaped notch than the electrode to direct the electrode, a holder on the support for reeciving the electrode, the holder being arranged to bottom in the notch, the holder having a recess to receive an electrode and the recess having an opening in a side thereof, and an electrode disposed in the recess and extending through the opening in the side of the recess and into engagement with the notch.

WILBUR A. ROBB.