US298576A - Type-writing machine - Google Patents

Description

(No Model.)

1 E. J. HALL.

TYPE WRITING MACHINE.

No. 298,576. Patented May 1-3. 1884;

WITNESSES INVENTOR r BY a ATTORNEYS.

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lJNTTE STATES PATENT Tr ce.- v

EMIL JULIAN HALL, OF ALEXANDRIA, VIRGINIA, ASSIGN OR OF ON E-HALF TO IVILLIAM W. GRANGER, OF WVASHINGTON, DISTRICT OF COLUMBIA.

TYPE-WR|TING MACHINE.

SPECIFICATION forming part of Letters Patent No. 298,576, dated May 13, 1884.

Application filed December 8, 1883. (No model.)

To aZZ whom it may concern.-

Be it known that I, EMIL JULIAN HALL, of Alexandria, in the county of Alexandria, in the State of Virginia, have invented a new and useful Improvement in Type-Writers, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, forming a part of this specification.

My invention consists of certain improvements on the type-writer shown and described in Letters Patent No. 238,387, granted to Thomas Hall under date of March 1, 1881, to which reference is made for a better understanding of the following.

In the drawings, Figure 1 is a partial plan view of the type-writer above referred to, showing my improvements thereon. Fig. 2 is a partial section on line 0 m of Fig. 1, showing the carriage in a raised position; and Figs. 3 and 4 are detail views.

A indicates the carriage of the type form, and B is the toothed drum supported on the carriage and engaging with the rack-bar 0, along which the carriage is to travel. This drum contains a clock-spring, which causes the carriage to travel along the rod or bar 0 step by step as often as a retaining-catch is released, and moving the .carriage back from right to left, with the drum in engagement 0 with the rack-bar,.rewinds the clock-spring in a well-known manner. In this construction the drum is not adjustable with respect to the rack-bar, and consequently the proper regulation of the tension of the clock-spring can- 3 5 not be attended to without taking the machine apart, or without danger to the fingers of inexperienced persons in handling the drum.

One of the objects of my invention is to render the drum adjustable with respect to the 40 rack-bar, in order that the tension of the spring may be quickly and safely adjusted by any one using the machine. I therefore support the drum on a sliding plate, D, rabbeted in the carriage Ain such manner that the drum may be adjusted to and from the rack-bar. This sliding plate is to be provided with any suitable device for holding the drum when out of engagement with the rack-bar.

I have shown two sliding pins, E, supported on the plate at opposite sides of the drum in position for engaging the teeth of the drum, and these pins are designed to be used, when not holding the drum, for locking the plate to hold the drum in contact with the rack-bar. For this purpose the rabbets or cleats F, as the case may be, are formed with notches G, with which the pins will engage when moved from the drum. The pins are thus made to serve two purposes, and by forming them of a suitable length, so that they cannot be moved 6o from one looking position without assuming the other locking position, they are converted at the same time into a safety device, so that accidents to the machine cannot readilyhappen, even in the hands of careless persons. This adj ustability of the drum conduces also to convenience in cleaning the rack-bar and other parts.

It is obvious that with the above-described construction the tension of the spring may be conveniently reduced orv increased at will,and to any, even the smallest, extent desired, by simply looking the drum and moving it out of contact with the rack-bar, and then moving the carriage along the rack-bar to the left or 7 5 the right hand, according to whether the tension of the spring is to be increased or reduced, and replacing the drum in engagement with the rackbar at a different point from that it previously occupied. The travel of the drum from this last position to the right-hand end of the rack-bar will unwind the spring either more or less than would have been the case if no change had been made in the relative position of the drum, so that when the spring is rewound by the backward movement of the carriage the tension thus put upon the spring will likewise be more or less than that it previously had when rewound.

Another object of my invention is to provide the carriage with an automatic catch to secure it in position when raised, to prevent it from accidentally falling upon the rule and paper-guide and injuring them. WVhen the carriage A is turned up or raised to the position shown in Fig. 2, it is supported against the bell-shaft H, and owing to the nearness of this shaft to the rack-bar O the carriage is liable to fall or be accidentally knocked down upon the paper-guide. I therefore pivot a I00 hook, I, to one side of the carriage, which hook for holding the drum from rotation under the action of its inclosed spring while being moved with said support, substantially as shown and described.

2. In the type-form carriage A, the combination, with the toothed drum B, of a movable support therefor, and a locking device, substantially as described, for holding the drum, and for securing the said support when in its normal position in turn, substantially as shown and described.

3. In the type-form carriage A, the combination, with the toothed drum B, of the sliding support or plate D, the notched cleats F,

in which the said plate is adapted to move, and the sliding pins E, supported on said plate,and adapted to engage with the teeth of 0 the drum and the notches of the cleats, substantially as shown and described.

EMIL JULIAN I'IALL. Vitnesses:

A. G. LYNE, SoLoN O. KEMoN.

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