US1028692A - Lantern and plates therefor. - Google Patents

Description

H. F. E. S. DUSSERIS & J. T. F. GONTI.

I ANTERN AND PLATES THEREFOR. APPLIOATION FILED APBA, 1910.

Patented Jul 1e 4, 1912.

2 SHEETS-SHEET 1. I

Fig.1.

H. F. E. S. DUSSERIS & J. T. F. GO-NTI.

LANTERN AND PLATES THEREFOR.

APPLICATION FILED ABBA, 1910.

1,028,692, Patented June 4, 1912.

2 SHEETS-SHEET 2.

I HENRI FRANCOIS ETIENNE SYLVAIN DIJ'SSERIS AND JAMES OF PARIS, FRANCE.

I ber of frames should be provided, Fig. 1..

UNITED sTATEsriiTEnT orr on. T,

TIBURCE FELIX CONTI,

Specification of Letters Patent.

Application filed April 4, 1910. Serial No. 553,307.

To all whom it may concern:

Be it known that we, HENRI Francois ETIENNE SYLVAIN Dussnins, of 19 Rue Du Montparnasse, and JAMES Tnnmos FELIX CoN'rI, of 8 Quai DOrleans, both citizens of the French Republic, residing at Paris,

France, haveinvented new and useful Improvements in Lanterns and Plates Therefor, of which the following is a specification.

Our invention relates to improvements in projection lanterns enabling a variablenu-mber of plates to be projected indefinitely n succession; the plates follow each other 1nstantaneously without any appreciable lnterval, the time during which the plates are exposed being variable at will and independently of the time required for replacing one by another.

This invention is characterized by: 1. The method of storing the plates. 2. The mechanism producing the instantaneous change of the plates. 3. The possibility of inclining the lantern horizontally and vertically, while at the same time the inclination of the plates to the optical axis can be caused to vary in each position. V

Figure 1 shows the'lantern in elevation. Figs. 2 and 3 are views to a larger scale of the plate feed mechanism in two different positions. Fig. 4 is a rear elevation of the lantern. Fig. 5 is a lateral diagram of the chain formed by the plate holders.

In the lantern all the plates are arranged in a series of frames connected one with the other by horizontal shafts around which they are pivoted, these shafts presenting this essential feature that they difier in length in pairs, that is to say a short shaft is preceded and followed by a long shaft and so on in succession so that an even num- In this lantern the number of frames may vary at will. For example from 18 to 120 plates and more may be arranged in the same lantern.

Heretofore plates have been stored in frames united to form a chain, but the characteristic feature of the present invention is the automatic and endless folding and unfolding. Owing to the difference in the length of the shafts the frames can be folded and suspended by the long shafts thereby constituting an endless chain. It is only necessary to cause the end of each shaft to move in U-shaped rails (a) and to provide a passage for the short shafts for aportion of their path, for example, between the point A and the pointB (Figs. 1 and 4). n

The short shafts leave the rails thus constituted and the folding takes place auto.- matlcally, the chain remaining suspended by the long shafts throughout the entire length of the magazine, that is to say from B to C, Fig. 1. v

The feed mechanism producing the instantaneous change of the plates and which is arranged at D in Fig. 1 is shown to a larger scale in, Figs. 2 and 3.

A ratchet wheel (6) is given a continuous friction upon a lever (e) which is freely mounted upon the shaft of the ratchet wheel and which is engaged and disengaged by means of two fixed and adjustable stops (f) and (g). I

' The lever (0) being acted upon by a counter spring (h) (or it might be acted upon by a counterweight) the pawl (c) bears against the stop (f) thereby causing it to engage with the ratchet wheel; it is driven by this wheel until the arm (d) of the pawl encounters the stop (g) and disengagement is effected under the influence of the counter spring (72.) the lever (e) is drawn back and the pawl bearing against the stop f) re- Iatented June 4', 1912.

engagement is effected and the movement begins again. It will therefore be seen that the movement of the lever from rightto left is caused by the spring (h) andthe movement. from left to right by'the ratchet wheel. The speed of this ratchet wheel can therefore be varied without altering the speed of the return movement produced by the spring (h). That is to 'say the timeof exposure can be varied while the changing of the plates is always effected instantaneously.

It will readily be understood that the reciprocating movement of the lever (6) can conveniently be utilized for causing the chain constituted by the plates to advance suddenly. For this purpose a small lever (j) acted upon by a spring is mounted w I ment to said chain.

of the arm (6') engages the shaft (Z) of the chain. (Fig. 3) and displaces it' suddenly to (m).

In order to prevent the shaft (Z) from passing beyond the position (m) owing to its acquired velocity amovable stop constituted by a lever (n) connected by the rod (0.) to the lever (e3 is arranged in such a manner that it is epressedr(Fig. 3) to permit of the passage of the shaft at the beinning of the movement of the lever (e);

V gimilarly in order to prevent the chain from moving rearward'anotch ('p) isformed on a weighted lever (q) acted upon by a counterweight (r)". This, lever (q) does not im ede the movement of the shaft (2) from V w rig t to left because this shaft de resses it by bearing upon an inclined'sur ace (g) p in which it terminates.

In order that this automatic lantern may be utilized for oblique projection the chain is guided in a frame mounted upon the shafts (-s), Fig. 1, in such amanner that the plates can be suitably inclined on shafts (s) Having now particularly described and ascertained the nature of our invention and what manner the same is to be 'performed,

we declare that what we claim is:

1. In projection lanterns, the combination of a chain of plate holders with alternating long and short horizontal shafts, of frames pivoted to said shafts, bein adapt-- ed to be folded and to be suspende on the lon shafts, inclined rails adjacent said lon sha ts, and means to impart to the chain 0 plate holders an intermittent movement.

2. In projection lanterns, the combination of a chain of plateholders with alternating long and-short horizontal shafts, of frames pivoted to said shafts, being adapted to be folded and to be suspended on the long shafts, inclined rails adjacent said long shafts, a uniformly operated feed mechanism, and means operated by said-mechanism for imparting an intermittent moveframes pivoted to said shafts, being adapt- 'ed to be folded and to be suspended on the long shafts, inclined; rails adjacent said long lanterns, the combinashafts, a uniformly operated ratchet wheel,

a spring-controlled lever, a two-armed pawl fixed adjustable stops, and means adapted to enga e and disengage said pawl and.

a continuous and uniform movement to said ratchet wheel and a lever rotating around the shaft of said ratchet wheel, a two-armed pawl frictionally mountedupon saidlever,

and two fixed adjustable stops upon the shaft of said ratchet wheel, and a'spring controlling-said. lever ada ted to normally hold one arm of the paw upon said lever against one of the stops and 1n engagement with the ratchet wheel and to disengage said pawl and ratchet wheel, when the second arm of said pawl encounters the other stop for the pur ose of varying the time of exposure but e eating the chan e of the plates instantaneously, substantia y as described. g

5. In a projecting device, the combination with a lantern, mechanism for' guiding a plate'chain' throughout a complete circuit downwardly in the direction of the advancing-movement of the chain, a continuous 'foldable-plate chain exceedin in length the combined length of its 'gui e mechanism, and means for'advancin'g a portion of the on the vfrictionally mounted upon said lever, two

shafts, a ratchet wheel, means for imparting chain abreast of the lantern and causing remaining portions of the chain to fold or collapse in said inclined portion of said guide mechanism.

In testimony whereof we 'aiiix our signatures. I

HENRI FRANCOIS ETIENNE I SYLVAIN DUSSERIS. JAMES TIBUROE FELIX corn;-

In the presence of VICTOR PREvos'r,

H. C. Coxn.

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