US1964251A - Gearing - Google Patents

Description

June 25, 1934- y L. A. cowLEs El AL 1,964,251

GEARING Filed May 10, 1953 2 Sheets-Sheet l Leo flCawles a, v Wilfred TCaw'Zes h ormdn rocTor Kg W72 June 1934. L. A. COWLES El AL GEAR I NG Filed May 10, 3933 2 Sheets-Sheet 2 3mm;- Lea l. COW (e5 W/(fr'ed fCowles A or man Procfor rotatable and slidable the rods or tracks being Patented June 26, 1934 UNITED STATES PATENT OFFICE GEARING Application May 10, 1933, Serial No. 670,256

9 Claims.

The present invention relates to gearing and more particularly to geared feeding mechanism.

The main objects of the invention are to provide a novel type of driving shaft geared to a driven shaft; to provide a spur gear driving shaft having a worm cut in the teeth thereof and geared to a driven shaft for rotating and sliding the driven shaft; and, to provide a novel type of geared feeding mechanism of the general character above indicated.

An illustrative embodiment of the invention is shown in the accompanying drawings, wherein:

Figure 1 is a front elevational view of the geared feeding mechanism here shown as adapted for use in conjunction with a carbon stick feeding device of an arc lamp;

Figure 2 is a sectional view thereof on line 2--2 of Figure 1;

Figure 3 is a perspective view of the driven shaft of the mechanism, including the tensionally retained positive carbon stick;

Figure 4 is an enlarged sectional view on line 4-4 of Figure 1;

Figure 5 is a sectional view on line 5-5 of Figure 4;

Figure 6 is an end view of a portion of the device showing the means whereby one set of the driven teeth are tensionally swung out of mesh with the worm of the driving shaft;

9 Figure 7 is a sectional view on line '7--7 of Figure 4;

Figure 8 is a sectional view on line 8-8 of Figure 6; and

Figure 9 is a fragmentary view of the worm meshing driven teeth.

The particular embodiment of the invention herein shown and described is here illustrated as used in conjunction with a carbon stick feeding mechanism of an arc lamp such as are used in motion picture projection machines. It is to be understood however that the geared mechanism is applicable for use in conjunction with other structures than that which is herein shown and described.

Referring then to the drawings in which like parts are designated by the same numerals in the several views, the structure generally comprises a vertically disposed hollow arm 1 forming a housing for the drive shaft 2 whose function 5 is hereinafter more particularly described. This vertically disposed arm likewise provides a support for a pair of laterally projecting spaced rods or tracks 3, 4 which are rigidly secured thereto in any suitable manner, the outer ends of held in spaced relation by a triangularly formed plate or bracket 5 and the nuts 6. A rotatable driving shaft '7, journalled in bearings at the upper end of the arm 1 and in the plate or bracket 5, is disposed intermediate the rods or tracks 3, 4 and in parallelism therewith, the inner end of the shaft having a tooth gear member 8 meshing with the worm 9 of the drive shaft 2.

This driving shaft 7 is provided with a plurality of radially disposed spur teeth 10 cut thereon and with a worm 11 helically cut in the spur teeth as best illustrated in Figure 5.

A feed element 12, here shown as bifurcated, is slidably secured to and retained interjacent the rods or tracks 3, 4 and a driven shaft 13, here shown as tubular, is journalled in the bifurcated portions of the feed element which form a housing for a gear wheel 14 mounted on the driven shaft and whose teeth 15 mesh with the radially disposed spur teeth 10 of the driving '75 shaft 7.

The tubular driven shaft is here shown as clamping means for the positive .carbon stick 16 which is inserted therethrough and tensionally retained therein by means of the screw threaded s0 washer 17 screwed to the split screw threaded free end of this tubular driven shaft. The inner end of this carbon stick 16 is spaced from the negative carbon stick 1,8 .as best shown in Figure 1 and suitable electric lead wires 19 are secured to the carbon sticks in any desired manner as by the clamps 20 to furnish electricity for the arc.

A member .21 slidably and rotatably embracing the rod or track 4 interjacent the depending arms of the bifurcated feed-element 12 is provided with a projecting finger 22 having teeth 23 on its inner surface meshing with the worm 11 on the driving shaft 7, and a helical spring 24 secured at one end to the stud 25 on the feed element 12 and at its other end to the lug 26 on the finger 22, tensionally retains the finger teeth in mesh with the worm during normal operation of the device but permits the finger teeth to be swung out of mesh with the worm when it is desired to slide the feed element 12 in instances wherein it is desired to replace new carbon sticks or otherwise reset the feed element.

As heretofore suggested, the embodiment of the invention herein shown and described is illustrated as used in conjunction with a carbon stick feeding mechanism of an arc lamp such as are used in projection machines. The positive carbon sticks of an arc lamp are gradually burned up in use and the geared feeding mechanism herein shown and described not only feeds the positive carbon stick in proper spaced relation to its negative stick but also causes the positivestick to rotate in its feeding movement.

In operation, rotation of the drive shaft 2 whose worm 9 meshes with the worm gear 8 causes the driving shaft 7 to rotate. Rotation of the driving shaft 7 whose worm 11 meshes with the worm gear 22 of the feed element 12 and whose spur teeth mesh with the gear teeth 15 of the driven shaft 13 carried by the feed element 12 causes the driven shaft 13 to not only rotate but also move forwardly to feed the carbon stick 16.

We claim:

1. In a gear mechanism, a rotatable shaft having radially disposed spur teeth out thereon and a worm cut in the spur teeth, a track disposed parallel with said shaft, and an element slidably mounted on said track carrying a member having teeth meshing with said worm and a second member having teeth meshing with said spur teeth whereby said second member is caused to slide and rotate by the rotation of said shaft.

2. In a gear mechanism, a rotatable shaft, means for rotating said shaft, said shaft having radially disposed spur teeth out thereon and a worm cut in the spur teeth, a track disposed parallel with said shaft, and an element slidably mounted on said track carrying a member having teeth meshing with said worm and a second member having teeth meshing with said spur teeth whereby said second member is caused to slide and rotate by the rotation of said shaft.

3. In a gear mechanism, a rotatable shaft, means for rotating said shaft, said shaft having radially disposed spur teeth out thereon and a worm cut in the spur teeth, and a device having a member provided with teeth meshing with said spur teeth and another member provided with teeth meshing with said worm.

4. In a structure of the class described, a driving shaft having radially disposed spur teeth out thereon and a worm cut in said spur teeth, a shaft supporting element slidably mounted with respect to the driving shaft and (1) carrying a driven shaft provided with teeth meshing with said spur teeth and (2) supporting a tensionally swingable member provided with teeth meshing with said worm whereby the driven shaft is caused to slide and rotate by the rotation of the driving shaft.

5. In a structure of the class described, a driving shaft having radially disposed spur teeth out thereon and a worm cut in said spur teeth, a track disposed parallel with said driving shaft and carrying a feed element thereon, said feed element comprising (1) a driven shaft whose one end is provided with teeth meshing with said spur teeth and whose other end is provided with a clamp for feeding detachably secured stock, and (2) a tensionally swingable member provided with teeth meshing with said worm whereby the driven shaft is caused to slide and rotate by the rotation of the driving shaft.

6. In a structure of the class described, a driving shaft having radially disposed spur teeth out thereon and a worm cut in said spur teeth, a shaft supporting element slidably mounted with respect to the driving shaft and (1) carrying a driven shaft provided with teeth meshing with said spur teeth and (2) supporting a member provided with teeth meshing with said worm whereby the driven shaft is caused to slide and rotate by the rotation of the driving shaft.

7. In a structure of the class described, a driving shaft having radially disposed spur teeth out thereon and a worm cut in said spur teeth, a track disposed parallel with said driving shaft and carrying a feed element thereon, said feed element comprising (1) a driven shaft whose one end is provided with teeth meshing with said spur teeth and whose other end is provided with a clamp for feeding detachably secured stock, and (2) a member provided with teeth meshing with said worm whereby the driven shaft is caused to slide and rotate by the rotation of the driving shaft.

8. A rotatable cross-sectionally circular element having radially extending gear teeth arranged in a series winding helically about the axis of said element and also arranged in a plurality of parallel series inclined relatively to said helical series, an element mounted for longitudinal movement parallelly with the axis of the firstmentioned element and having teeth meshing with the teeth thereof, an element mounted for rotative movement about an axis parallelly disposed relatively to the axis of the first-mentioned element and having teeth meshing with the teeth thereof.

9. In a gear mechanism, a rotatable shaft having radially disposed spur teeth out thereon and a helical worm continuously cut in the same direction across the spur teeth, and a device slidably mounted with respect thereto having a member provided with teeth meshing with the worm and having another member provided with teeth meshing with said spur teeth.

LEO A. COVVLES. WILFRED F. COWLES. NORMAN J. PROCTOR.

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