US2176381A

US2176381A - Transport operator

Info

Publication number: US2176381A
Application number: US233142A
Authority: US
Inventors: Burton E Shaw
Original assignee: Penn Electric Switch Co
Current assignee: Penn Electric Switch Co
Priority date: 1938-10-03
Filing date: 1938-10-03
Publication date: 1939-10-17
Anticipated expiration: 1956-10-17

Description

Oct. 17, 1939. B. E. SHAW 2,176,381

TRANSPORT OPERATOR Filed Oct. 3. 1938 erated through its range of movement. 1

Still another object is to provide a crank shaft Patented Oct. 17, 1939 PATENT OFFICE TRANSPORT OPERATOR Burton E. shawy Bristol, Ind; assignor to Penn Electric Switch 00., Goshen, Ind., a corporation of Iowa Application October 3,

10 Claims.

An object of my'present invention is to provide a transport operator of simple, durable and inexpensive construction.

A further object is to provide a remote controlled operating device for transports or picture projecting machines, the device beingelectrically driven and manually controlled in such manner that the operation of the transport for advancing film or the like thereir'none frame at a time, is accurately under control of the user of the transport regardless of his position relative to the transport.

Still another object is to provide a transport operator for the kind of transport having a retractible Operating lever, my mechanism being so designed and connected with the operating lever of the transport that my mechanism swings the lever through its predetermined movement with substantially less than a half revolution of a crank pin of the transport Operator, the remaining portion of the revolution thereof being utilizable as space 'in' which the operating mecha-' nism can overrun after the lever has been opand a crank pin for swinginga'transport operating lever, a link being so connected with the crank pin and slidable relative to a stationary element with the means of connection between the link-and the transport operating lever being so designed that a substantially small degree of rotation of the crank pin will operatethellever and the remaining portion of one revolution thereof is available for overrun of a remote con-' trol electric motor and a. gear train connection between the motor and the crank pin.

Still a further object is to provide a connection between the link and the transport operating element in the form of a flexible connection and to provide an extension on the link adjacent the' ed out in my claims and illustrated in the accompanying drawing in which:

Figure 1 is a plan view of a portion of a transport and of my transport operator "connected therewith, a portion of thecasing of my operator is adjacent dead 1938, Serial No. 233,142

being broken away to show internal features of construction.

Figure 2 is a sectional view on the line 22 of Figure 1 showing the transport operator at the beginning of the throw of the Operating lever of the transport; and

Figure 3 is a similar view showing the parts in their position adjacent the end of the throw,

On the accompanying drawing I have used the reference numeral l I to indicate generally a base. The base II has mounted thereon a transport T which is a usual type of projector, the major portion of which is broken away as in Figure 1.

Briefly the transport T consists of a lens tube ID, a film housing l2 and a lamp housing I3. Within the film housing [2 a strip of film I4 is advanced by a film'sprocket I5. The film sprocket [5 is mounted on a shaft l6 having thereon a ratchet wheel H, the ratchet wheel l! being adapted to be advanced one tooth at a time by an operatinglever 18. The lever I8 is pivoted at l to a flanged disk 20. The disk is rotatable on the shaft l6 and is normally retained in the position of Figure 2 by a spring 2!. The spring 2| has one end engaging a stationary stop pin 22 and its other end engaging the lever 18 in such manner that it normally pulls the lever against the stop 22 and swings it outwardly from the ratchet as shown by solid lines in Figure 2.

The lever I8 is adapted to travel through an arc of a circle indicated by the dimension line B. It is shown at the limits of its movement by solid lines in Figures 2 and 3. Such movement results in rotation of the ratchet wheel I! a quarter rev- Olution for advancing the film M on the sprocket 15 one frame.

A transport of the kind thus far described is ordinarily operated by manually swinging the lever l8 or attaching a cord or the like to it for swinging the lever by pulling on the cord. 0

I provide a convenient type of remote control for the purpose of my transport operator, which will now be described.

A casing 23 is mounted on the base It for housing a portion of the mechanism of my Operator. The casing 23 has mounted therein an electric motor M. A crank shaft 24 is journalled in a plate'25 and in one side of the housing 23. A gear train consisting of

gears

26, 21 and 28 and pinions 29, 30 and 3| operatively connects the motor M with the crank shaft 24. The pinion 3| is mounted on the motor shaft while the pinion 29 rotates and is secured to the pinion 28 and the gear 30 is secured to the gear-'21. Mounted on the gear shaft 24 exterior of the housing 23 is Lil) the other revolution thereof.

a crank disk 32. A crank pin 33 is carried thereby.

A stationary pin 34 is mounted on the housing 23 and a link 35 is slidably mounted relative thereto. The pin 34 is headed and the link has a slot 33 whereby the slidable connection is made. One end of the link 35 is rotatable on the crank pin 33 and the other end carries a pin 31.

An operative connection is provided between the pin 3'! and the operating lever l8 consisting of a flexible member 38 and a spring 39. The flexible member 38 may be a cord or cable.

The link 35 carries an extension such as the pin All adapted at times to engage the flexible member 38, as shown by dotted lines in Figure 2. The arrangement of the film, sprocket shaft l6, crank shaft 24 and the pin 34, it will be noted, is such that they are substantially in alignment, with the crank shaft located between the pin and the sprocket shaft. The link 35 is mounted so that it extends away from the sprocket shaft.

The motor M is adapted to be controlled from a remote point by a push button 41 (see Figure 1 wherein the circuit for the motor is shown diagrammatically). It will be obvious that depression of the push button will cause the crank disk 32 and the crank pin 33 to rotate and that rotaticn will stop after the push button is released as soon as the momentum of the motor and the gear train has been expended. A crank pin could be connected by a link with the lever it in an ordinary manner and result in swinging the lever in one direction during one-half the revolution of the crank pin and in the other direction during This would give only a half revolution in which to release the push button and permit the momentum of the parts to be expended. Accordingly I have provided the arrangement of link 35, stationary pin 33, flexible connection 38, spring 39 and extension 43 designed as illustrated for the specific purpose of enabling the desired movement of the lever 58 counter-clockwise through its extentof movement indicated by the dimension line B, while the crank disk 32 is rotated about one-fourth of a revolution as indicated by the dimension line B. This is accomplished by the link 35 being pivoted to the crank pin and slidable on the element 33 so that from the full line position to a position past the dotted line position in Figure 3 there is substantially very little movement of the pin 31 toward or away from the sprocket shaft I 6. Likewise, during the movement prior to the position shown in Figure 2 (the disk 32 rotating counterclockwise as indicated by the arrow A), there is very little movement toward or away from the sprocket shaft. The lever I8 is close to alignment with the shaft I6 in Figure 2 or, in other words, adjacent a dead center position. Accordingly, by providing the extension pin 40, the pin will engage the flexible member 38 as shown by dotted lines in Figure 2 and tend to counteract the direct pull due to this position adjacent dead center or, in

other words, tend to pull somewhat downwardly tensioning of the spring 39 without any further movement of the lever l8. Accordingly, anywhere between the full line position of Figure 3 and the dotted line position of Figure 2, motor M can be deenergized and stopped with assurance that the particular frame of the film l4 brought into focus by the operation of the motor M will not be disturbed by the beginning of the next operation.

The user of the machine can watch the screen and as soon as a frame has been brought into position, release the button 41 and will be assured thus of proper positioning due to the extensive part C (see Figure 2) through which the mechanism can travel before starting the next ratchet rotating operation. The spring 39 eliminates the necessity of a fine adjustment on the link of the flexible element 38.

The arrangement of the parts according to the foregoing specification gives the desired result of considerable leeway in overrun after the push button 4| is released, yet insures a quick movement of the film from exposure of one frame to exposure of the next one during rotation of th disk 32.

Some changes may be made in the construction and arrangement of the parts of my transport operatorwithout departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim as my invention:

1. For use with a transport having a lever adapted when swung through a predetermined arc to operate the transport and means to retract said lever, a transport operator comprising a crank shaft spaced from said lever, a crank pin thereon and means for operatively connecting said crank pin with said lever whereby the lever can be swung through its said predetermined are by substantially less than a half revolution of said crank shaft, comprising a stationary element spaced from said crank shaft opposite said lever, a link slidable relative to said stationary element and rotatably mounted on said crank pin and a flexible and resilient connection between said link and said lever.

2. For use with a transport having a lever adapted when swung through a predetermined are to operate the transport and means to retract said lever, a transport operator comprising a crank pin, a crank shaft therefor and means for operatively connecting said crank pin with said lever whereby the lever can be swung through its said predetermined are by substantially less than a half revolution of said crank shaft, comprising a stationary element spaced from said crank shaft, a link slidable relative thereto and having one end rotatably mounted on said crank pin and a resilient connection between said link and said lever.

3. For use with a transport having a lever adapted when swung through a predetermined arc to operate the transport and means to retract said lever, a transport operator comprising a crank pin, a crank shaft therefor and means for operatively connecting said crank pin with said lever, comprising a stationary element spaped from said crank shaft, a link slidable relative thereto and rotatably mounted on said crank pin and a connection between said link and said lever.

4. For use with a transport having a lever adapted when swung through a predetermined u arc to operate the transport and means to retract said lever, a. transport operator comprising a crank pin, a crank shaft therefor and means for operatively connecting said crank pin with said lever whereby the lever can be swung through its predetermined are by substantially less than a half revolution of said crank shaft, comprising a stationary element spaced from said crank shaft, a link having its intermediate portion slidable relative thereto and one end rotatably mounted on said crank pin and a flexible connection between the other end of said link and said lever.

5. For use with a transport having an operating element adapted when being moved through a predetermined distance to operate the transport and means to retract said operating element, a transport operator comprising a crank shaft and means to operate said operating element through its said predetermined distance with substantially less than a half revolution of said crank shaft, including a crank pin carried by said crank shaft, a stationary element, said crank shaft being located between said stationary element and said operating element, a link rotatable on said crank pin, said link extending past said stationary element and being slidably supported thereby and means of connection between said operating element and said link, comprising a flexible element and a resilient element, said link adjacent said crank pin having an extension to engage said flexible element during a portion of the revolution of said crank pin.

6. For use with a transport having an operating element adapted when moved through a predetermined distance to operate the transport and means to retract said operating element, a transport operator comprising a crank shaft, a crank pin carried by said crank shaft, a stationary element, said crank shaft being located between said stationary element and said operating element, a link rotatable on said crank pin, said link extending past said stationary element and being slidably supported thereby and means of connection between said operating element and the other end of said link, comprising a flexible element, said link having an extension to engage said flexible element during a portion of the revolution of said crank pin and thereby change the angle of pull of the flexible element on the operating element.

7. For use with a transport having an operating element adapted when moved through a predetermined distance to operate the transport and means to retract said operating element, a transport operator comprising a crank shaft and means to operate said operating element through said predetermined distance with substantially less than a half revolution of said crank shaft, including a crank pin carried by said crank shaft, a stationary element, a link having one end rotatable on said crank pin, said link extending past said stationary element and being slidably supported thereby and means of connection between said operating element and the other end of said link.

8. For use with a transport having an operating element adapted when moved through a predetermined distance to operate the transport and means to retract said operating element, a transport operator comprising acrank shaft and means to operate said operating element through said predetermined distance with substantially less than a half revolution of said crank shaft, including a crank pin carried by said crank shaft, a stationary element, a link rotatable on said crank pin, said link extending past said stationary element and being slidably supported thereby and means of connection between said operating element and said link, including a resilient element.

9. A transport operator for a transport having a ratchet and pawl film advancing mechanism comprising a crank shaft having a crank pin and means of operative connection between said crank pin and said ratchet and pawl mechanism whereby substantially less than one-half revolution of said crank shaft operates the mechanism, said operative connection comprising a stationary element spaced from said crank shaft, said stationary element, crank shaft and the axis of said ratchet and pawl mechanism being substantially in alignment with each other with the crank shaft located between the stationary element and the pawl and ratchet mechanism, a link slidable relative to said stationary element and rotatable relative to said crank pin and a flexible connection between said ratchet and pawl mechanism and a portion of said link beyond said stationary element, said link adjacent said crank pin having an extension to engage said flexible connection and bend it out of normal aligned position during a portion of the revolution of the crank shaft.

10. A transport operator for a transport having a ratchet and pawl film advancing mechanism comprising a motor driven crank shaft having a crank pin and means of operative connection between said crank pin and said ratchet and pawl mechanism whereby substantially less than onehalf revolution of said crank shaft operates the mechanism, said operative connection comprising a stationary element spaced from said crank shaft, said element, crank shaft and the axis of said ratchet and pawl mechanism being substantially in alignment with each other, a link slidable relative to said stationary element and rotatable relative to said crank pin and a connection between said ratchet and pawl mechanism and said link.

BURTON E. SHAW.