US1191761A - Projecting apparatus. - Google Patents

Description

C. E. CHAPMAN.

PROJECTING APPARATUS. APPLICATION FILED'JUNE 19. 1915.

Patented Ju1y1 8, 1916.

3 SHEETS-SHEET 1.

-. IIIIIIIII:

WITNESSES:

B) C 5 ATTORNEY C.E.CHAPMAN.

PROJECIING APPARATUS.

Patented July 18, 1916.

APPLICATION men lUNE as} 1915.

3 SHEETS-SHEET 2.

WITNESSES:

Arm/m C. E. CHAPMAN.

PROJECTING APPARATUS. I

APPLICATION FILED JUNE 191 I915- v 1 1 91 761 Patented July 18, 1916.

3 SHEETS-SHEET 3.

WITNESSES: INVENTOR ATTORNEY To all whom it may concern CHARLES E. onarmamor DALLAS, TEXAS.

PROJECTING APPARATUS.

Be it known thatI, CHARLES E. CHAP- MAN, a citizen of the United States, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new an useful Improvements in Projecting Apparatus, of which the following is a specification. r

This invention-relates to new and useful improvements'in rojecting apparatuses.

The object of t e invention is to provide a rojecting apparatus of the revolving sli e carrier type and of particular construction involvmg' a continuous operating feature whereby manual operation or manip'ulation is ehminated.

Another feature resides in the rovision of an apparatus of the character escribed including av revolving slide carrier, means for intermittently imparting eriods' of revolution'to the carrier, means 0r holding the carrier against revolution during the rest or projecting periods, and lamp for efl'ectin the projecting connected in a circuit inc uding a circuit breaker and a pair of switches, one of said switches cutting out the circuit breaker whereby the circuit through the lamp is constant. and the other switch cutting in the circuit breaker whereby the lamp is cut out 'during'the periods of revolution of the carrier.

A still further object of the invention is,

to provide an a paratus of the character described thatwill be strong, durable, efficient and simple, and comparatively inexpensive to construct, also one in which the several parts will not be likely to get out of working order. I

With the above and other objects in view the invention has relation to certain novel features of construction and operation, an

example of which is described in the following specification and illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation of the apparatus, Fig. 2 is a rear elevation, Fig. 3 is a horizontal cross sectional view taken on the line Z-Z of Fig. 1, Fig. 4 is a transverse sectional view taken on the line YY of Fig. 1, Fig. 5 is a detail of the locking means,'Fig. -6 is a partial interior view of the carrier showing the manner of fastening the slides, Fig. 7 is an end elevation.

of the circuit breaker and associated parts, Fig. 8' is a detail of thelower portlon of the locking means and its operating cam, Fig.

Specification of Letters Patent.

Patented July 18, 1916.

Application filed J'un 19, 1915. Serial No. 34,982.

9 is a detail in front elevation of the carrier operating ratchet and component parts, one

of which has a portion shown in section, and Flg. 10 1s a diagrammatical view of the cird' cuits connecting the different electricalelements of the apparatus.

In the drawings the numeral v1- designates a casing having a suitable construction forthe purpose for which it is used. In the central portion of the casing a post 2 is mounted-on the bottom and supports a transverse mandrel 3 at its upper end. The opposite end of the mandrel is supported in the upper end of a standard 4. revolving carrier 5 .in the form of a cylindrical drum having one side opposite the standard, open, is fixed on the mandrel between the post and standard. In' the perimeter of the carrier openings 6 are disposed in regular order ciroumferentially thereof so as to exhibit glass v slides 7 secured to the inner surface of the perimeter by flanged-head screws 8.

' Within the carrier a lamp barrel" 9 is mountedso" that its forward open end is in uxtaposition to the path in which the slides are carried. An electric projecting lamp 10v is mounted on a bracket 11 and stands uprightin the barrel. The rear end of the bar rel is closed and this portion of the apparatus is constructed in the usual way so as to reflect rays of light through the slide into the pi'ojector 12 which in turn projects the images and characters-from the slides onto the surface toward which the apparatus is directed.- i

The pro ector 12 is of course of such size and apparatus constructed so asto project only one sllde at a time. The details of the pro ecting mechanism are not claimed as novel features and may be of any approved construction. The essence of the invention lies in the means for automatically'operating the various-elements thereof and involves means for intermittently revolving the carrier a distance sufficient to bring the next slide into position in front of the barrel 9, In combination with means for burningthe lamp 10 constantly or cutting it out during" the movements of the carrier. In carrying out these features a ratchet 13 is secured to the mandrel '3 on the side of carrier adjacent the post 2. This ratchet has a tooth for eagi slide opening 6 and a hole 14 for each tooth. The ratchet teeth are proportioned so that movlng the ratchet the distance of one tooth brings the next slide opening into position.

On the post a cross bar 15 is secured and as is best shown in Fig. 9. At one end of the bar a vertical guide sleeve 16 is mounted and receives a vertically sliding pawl 17 held in engagement with the ratchet teeth by a flat spring 18 secured to the sleeve and bearing against the pawl. The bore of the sleeve is somewhat larger than the area of the pawl whereby said pawl may move laterally in slipping over the teeth. At the opposite end of the bar 15 an angular locking dog 19 is hinged and has its upper end reduced at 20 so as to enter the holes 14 and normally hold the ratchet and carrier against revolution. A spring 21 forces the dog into the holes.

By'throwing the dog 19 out of the engaged hole 14 and pulling down on the pawl 17 the ratchet 13 is revolved as above described. For accomplishing this a timing device comprising a shaft 22 mounted in brackets 23 is employed. The brackets are secured to the sides of a block 24 of insulating material. On the shaft which is d1s posed parallel to the ratchet 13 a c1rcu1t breaking or contact cylinder 25 is secured and located between the brackets. On the end of that shaft adjacent the pawl 17 a cam 26 is fixed. This cam has a pair of sinuous faces on which the curved end of a pawl lever 27 rides. This lever is lntermediately pivoted on a post 28 rising from the block 24 and has its inner end pivoted in the pawl 17. I

As shown in Fig. 7 the pawl 17 1s 1n 1ts' upper position, being so held by the lever 27. The end of the said lever is about to ride up the curved face of the cam 26 which is revolved in the direction of the arrow. This action being continued swings the lever so that its inner end is swung down whereby the pawl is pulled down against the tension of a coiled spring 29 attached as shown. The downward movement of the pawl revolves the carrier 5 by means of the ratchet 13, a sufficient distance to bring the next slide into position in front of the barrel 9. When the lever 27 has completed its work in pulling the pawl down, the end of the cam Wlll have passed from under the curved end of said lever and the other face presented, whereby the lever will be swung in the opposite direction, the pawl being moved upward in which the spring 29 assists.

On the shaft 22 a second cam 30 is fixed and is provided with two working faces in opposed relation. The lower angular end of the dog 19 is directed toward the cam 30 and projects into the path of its working faces. When the pawl 17 is in its upper position the faces of the cam 30 are out of engagement with the dog and when the cam 26 reaches the position shown in Fig. 7 the cam 30 arrives at the point shown in Fig. 8 so that the dog is swung to remove the reduced end 20 from its hole 14 just prior to the initial downward movement of the pawl and the faces of the cam 30 are sufficiently long to hold the dog inactive during the revolution of the carrier, but ride ofi the end of the dog when said pawl reaches the end of its down stroke. This permits the spring 21 to force the end 20 into one of the holes 14 and lock the carrier against further revolutionand to hold it stationary during the upward movement of the pawl. It will beapparent of a belt 32 a pulley 33 fixed on the end of a shaft 35 journaled in the upper end of a standard 34. A pulley 36 is also mounted on the shaft 35 within the standard and drives a large pulley 38 by means of a belt 37, said pulley 38 being connected with a train of gears 39 mounted in the standard thereunder. A pinion 41 mounted on a shaft 40 also supported in the standard is driven by said train of gears and meshes with a gear 42 fixed on the end of the shaft 22. The pulleys'and gears are so proportioned and connected that motion will be imparted to the shaft 22 at-the' proper rate of speed.

By observing Fig. 10 it will be seen that contact cylinder 25 controls a circuit leading to the lamp. On the said cylinder apair of contact plates 43 are arranged in opposed relation. A pair of contacts 44secured to the block 24 have their upper ends curved and bearing on the surface of the cylinder which aside from the plates has an insulated surface. The electric current is cut into theapparatus through a main switch 46 from which circuit wires A and B lead respectively to a rheostat 45 and the motor 31, the circuit from the rheostat to the motor being established by a wire O. The wire A has connection with a .wire G leading to the lamp 10 and from which a wire F leads toa switch 48 which when closed completes the lamp circuit through a wire H and a switch 47, also closed and connected with the wire B. The motor is operated and the lamp caused to burn constantly by this arrangement. controlled by the rheostat 45. The circuit breaker is cut out when the lamp burns continuously, but to cut in the circuit breaker the switch 48 is opened whereby the cir- The speed of the motor is of course L' cuit from the lamp is established over a wire mony with the cams 26 and 30 so that each plate rides from under the contacts, just prior to the initial downward movement of the pawl 17 and the-following edge of the next plate rides under the contacts just as said pawl completes its downward stroke, the circuit through the lamp being broken and the lamp extinguished during the down stroke of said pawl.

In operating the apparatus it is set in position to properly project the subjects of its slides 7 on the surface selected and the switches 46 and 47 closed whereby the motor is energized and the circuitthrough the circuit breaker established. The subject of the slide 7 opposite the end ofthe barrel 9 will be projected and the cylinder 25 will be revolved by the gearing and driving mechanism. When the cylinder reaches the position shown in Fig. 7 the plate 43' will ride from under the contacts 44 and open the lamp circuit whereby the lamp will be extinguished and then the cam 26.will swing the lever 27 whereby the pawl;17 willbe pulled 1 down and the ratchet 13 revolved sufficiently to move the carrier 5 so that the nextv slide 7 is brought into position at the forward end of the barrel 9. When the cam 26 started to swing the lever up the cam- 26 engaged the dog 19 and swung it so that the end 20 was withdrawn from its hole 14.

As the cam 26 completes its upward swing of the pawl 17 the cam 30 rides off the dog 19 and the spring 21- forces the end' 20 into the hole 14 'whereby the carrier is locked against movement during the u ward move-.

7 ment of the pawl which is'e ectedby the spring 29. As the cam. 30 rides oil the dog.

the next plate 43 rides under the contacts and closes the lamp circuit. If it is not desired to extinguish the lamp during thechanging of the slides the switch 48 is closed whereby the circuit breaker is cut out of the'lamp circuit. The length of the period during which each slide is exposed to the-lamp depends is run, which is controlled by the rheostat 45.

What I claim, is:

1. The combination in a projecting .ap.

upon the speed atwhich the motor 31- paratus'of a revolving slidecarrier; a lamp acting in con unctlon with the carrier; means for intermittently imparting periods of said device being constructed to'be withdrawn from the ratchet during the opera-- tion of the latter, and an operating element carried by the continuously operatlng member constructed to operate the locking device.

I 2. In an automatic projecting apparatus, the combination of a revolving slide carrier normally at rest, a continuously operatingdriving member, a ratchet connected with the carrier, a locking device engaging the ratchet. and normally holding the same against operation, a pawl engaging the ratchet, acam operated by the operating member, a lever for operating the pawl operated by the said cam, a second cam operated I by the operating member constructed to operate the locking device, and a lamp acting in conjunction with the carrier.;

3. Inan automatic projecting apparatus, the combination of a casing, a, post mounted in thecasing, a revolvingslide carrier jour-' naled on the post, an electric lamp mounted in the carrier, a ratchet fixed to. the carrier, a pawl mounted on the post and engaging the ratchet, said ratchet having a plurality'of holes, a locking dog pivoted on the po'stand engaging the holes of the ratchet, a cam engaging-the dog, a shaft" carrying the cam,

a second cam mounted on the shaft,'a lever engaging the pawl and swungbythesecond cam, a circuit breaker also mounted on said shaft and electrically cpnnected with the lamp, a train of gears revolving the shaft, and means for continuously operating the gears during the operation of the a paratus. In testimon whereof I aflix mys gnature.

HARLES E. CHAPMAN.

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