US1299795A - Changeable exhibitor. - Google Patents

Description

G. A. SHIELDS.

CHANGEABLE' EXHIBITOR.

I APPLICATION FILED JULY 5.1917. 1,299,795. Patented Apr. 8, 1919.

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G. A; SHIELDS.

CHANGEABLE EXHIBITOR.

APPLICATION FILED JULY 5. um.

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GUY A. SHIELDS, 0F SPOKANE, WASHINGTON, ASSIGNOR 0F ONE-HALF TO GEORGE SHIELDS, OF SPOKANE, WASHINGTON.

CHANGEABLE Exnnsrron.

Specification of Letters Eatent.

Patented Apr. 8, 1919.

Application filed July 5, 1917. Serial No. 178,725.

To all whom it may concern:

Be it known that I, GUY A. SHIELDS, a citizen of the United States, residing at Spokane, in the county of Spokane and Stateof Washington, have invented certain new and useful Improvements in Changeable Exhibitors, of which the following is a specification.

The present invention relates to improvements in changeable exhibitors especially adapted for use on railroads or street cars for indicating succeeding stations or streets and avenues, and for general advertising and display purposes in which the announcing Web or ribbon is passed over and wound upon compensating rollers, and operated by a step by step movement as will be hereinafter more fully set forth.

The primary object of the invention is the provision of an indicating device of this character which is'positive and 'acdurate in its action, comparatively simple in construction and operation, durable, and withal efficient in performing the functions for which it is intended.

The invention consists essentially in th utilization of a friction roller for direct contact with the web or ribbon to operate the ribbon, and in certain novel combinations and arrangements of parts for compensating devices to provide for the increased and decreased sizes of the rollers as they operate, and in certain novel combinations of parts for actuating the operating rollers, as will be described in detail.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles of the invention.

Figure 1 is a front elevation of the exhibitor, partly broken away for convenience of illustration.

Fig. 2 is a side elevation of the device of Fig. 1.

Fig. 3 is a vertical, central sectional view on line 3-3 of Fi .1.

Fig. 4 is an enlarged, detail view of the pawl and ratchet device for imparting a step by step movement to the exhibitor.

Fig. 5 is a view similar to Fig. 4 but showing the pawl in position after it has completed its movement, the dotted lines indicating the position of the pawl when it is re versed.

6 is'a sectional detail view showing the bearings and actuating device for the rollers;

Fig. 7 is a detail of the parts used for reversing the action of the exhibitor.

Fig. 8 shows the same parts as 7 in different position after withdrawal.

Fig. 9 is an enlarged sectional view showing the spring pressed clamp head on the end of the operating shaft.

The changeable exhibitor is inclosed within a casing or box 1 made of suitable size and material and provided with a front window 2 through which the station, street or avenue may be observed. An operating shaft 3 is journaled in fixed bearings 4 in the casing and a roller 5 is fixed on the shaft and furnished with a friction coverii 6 adapted to contact at all times with the ace of the web or ribbon 7 which bears the names of the railroad stations, streets or avenues, and is adapted to wind and unwind upon the two ribbon rollers 8 and 9 which are provided with shafts 10 and 11 passing therethrough. These shafts are journaled in bearing sleeves 12 and 13, and the sleeves are fixed in a movabl bearing plate 14 one of which is located at each end of the rollers, and these plates are slotted at 15 to accommodate the operating shaft 3. The bearing plates are adapted to be moved vertically to compensate for changes in the size of the two rollers as the ribbon is wound and unwound thereon, and the bearing sleeves of the shafts are guided in the respective slots 16 and 17 in the sides of the casing l. The ribbon is guided over a pair of idler rollers 18 and 19 in the front of the casing sothat the ribbon may be made to pass just back of the window where it may be read with facility. Thus while the two ribbon rollers are spaced and fixed in their relation to each other, their axes are constantly changing their distances from the axis of the operating shaft which axis remains stationary, and the friction operating roller moves the ribbon by direct contact therewith upon the upper and lower rollers. The ribbon rollers are actually supported on th operating roller through the upper roller, and as the diameter of the roller increases the bearing plates are raised and as this diameter decreases the bearing plates are lowered, thus compensating for the movement of the ribbon and keeping the ribbon at all times taut in front of the window.

The shaft 3 is operated or actuated with a step by step movement, a quarter turn, through the medium of the ratchet wheel 20 fixed on the shaft 3 and provided with four teeth 21. These teeth are engaged by "a curved pawl 22 pivoted in the forked end 23 of a stem or bar 2-1 of the solenoid magnet 25 fixed by brackets 26 at the top front edge of the casing 1. The solenoid bar is surrounded by a protractile spring 27 interposed between one of the brackets and the forked end of the stem, and these two forces move the stem, the spring to turn the ratchet wheel through the stem and pawl, and the solenoid to retract the stem. The movement of the pawl is illustrated in Figs. 4 and 5 which show respectively the start and finish, and it will be noted that the pawl in Fig. 5 is engaging two teeth and holding the ratchet wheel against movement. The normal position of the pawl is indicated in Fig. 5 and held there by the spring. To move the wheel the circuit is made and the solenoid withdraws the stem and pawl, the circuit is then broken and the spring forces the pawl to act as described. The pawl is slotted at 28 so that it may be sivung over to dotted position when the indicator is to be reversed without the necessity of removing the pivot screw 29.

\Vhen it is desired to reverse the motion of the ribbon the spring pressed head 30, which has a. set screw 31 movable in the slot 32 in the operating shaft 3 and held in posi-- sition by the spring 34 in the hollow or opening 33 of the head, is operated. A spring plate 35 slotted at 36 to fit over the head and the pivot pin 29 guides the movement of the stem and also swings the pawl over to reversed position when the spring head is withdrawn and turned to reverse the movement of the ribbon.

YVhat I claim is The combination in a reversible, changeable exhibitor of an operating shaft and a ratchet wheel, a spring pressed stem and a slotted, reversible pawl carried by the stem and engaging a plurality of teeth, and means for withdrawing the stem to co-act with the spring for imparting a step by step movement to the operating shaft.

In testimony whereof I aifix my signature.

GUY A. SHIELDS.

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