US446432A - Henry e - Google Patents

Description

(No Model.)

H. E. CURTIS;

TYPE WRITING MACHINE.

N0. 446,432. Patented Feb. 17; 1891;

m: Nunms mm ca, mom-mm, wAshmGTuN n c llhvirnn Stains Parent orient HENRY E. CURTIS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO THE YOST IVRITING MACHINE COMPANY, OF NEW YORK, N. Y.

TYPE-WRITING MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 446,432, dated February 17, 1891. Application filed June 4:, 1888. Serial No. 275,973. (No model.)

To all whom, it may concern: I

Be it known that I, HENRY E. OUR'rIs, a citizen of the United States, residing at Springfield, in the county of llampden and State of Massachusetts, have invented certain new and useful Improvements in 'lype-lVriting Machines, of which the following is a full, clear, and. exact description, reference being had to the accompanying drawings, which form part of this specification.

Previous to my invention the key-levers of type-writing machines have been arranged in a variety of ways, so as to act as lovers of the second or third order. In machines in which the key-levers are of the second and thirdorders the connecting-rod is attached to the type bar or carrier in rear of its fulcrum and is pulled down at each depression of the finger-key. The objection to machines'having key-levers of the second and third orders is that the levers are of different lengths, (or the finger-keys located at differentdistances from the fulcra of the levers,) and hence have a varying extent of depression and require different applications of power to elevate the type-bars, according to the bank of keys being operated upon. The objection to the use of a key-leverof the third order is greater than that to a lover of the second order, for the reason that more power isrequired to operate the former than the latter kind of lever.

My invention has for its main object to so arrange key-levers of the second and third orders that the depression of each finger-key may be exactly the same and so that the muscular power required to operate one key may be precisely the same as that required to operate any other key on the key-board of the machine.

To these main ends and obj ccts my invention consists in the combination of parts hereinafter more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of a type-writing machine involving my invention. Fig. 2 is a perspective skeleton view to better show the construction and arrangement of the parts embodying my improvement. Fig. 3 is a skeleton plan View to show the arrangement of two sets of lovers for different banks of keys. Fig. 4 is a vertical section, taken at the line Ll, of Fig. 2; and Fig. 5 is a similar View taken at the line y g of the same figure.

In the several views the same part will be found designated by the same letter or numeral of reference.

A is the bed-plate or base of the machine, upon which posts B B are secured to support the usually-employed type-ring or top-plate O.

D is the carriage, containing a cylindrical platen E.

2 represents a type bar or carrier, which is pivoted or fulcrumed at 3 in a hanger or support and is attached at its rear end t to the upper end of a vertically-arranged connecting-rod 5.

6 represents a lever, which is hinged or fulcrumed at one end on a crossbar 7 at the front of the machine. The opposite end of said lever is connected to the lower end of the connecting-rod 5, preferably loosely and simply by resting upon a small anti-friction roller 8, journaled in the bifurcated extremity of said connecting-rod.

9 represents another lever, which is pivoted or f ulcru med at one end on another cross-bar 10, located back of the key-board of the machine. The front end of the lever 9 is connected to a forked or slotted socket 11, which bears at its upper end a finger-key button 12. Between their fulcrums the two levers 6 and 9 are connected by a link 13, preferably pivoted at each end and preferably made of two separate bars and applied one on each side of the levers.

The levers 6 and 9 of each set stand in the same vertical plane and the levers 6 all pass through the slots 14: in the finger-key sockets and are prevented thereby from having lateral movement. The slots 1% are elongated to permit the requisite depression of the finger-keys, the upper end or stems of which pass through perforations in the cross-bars 15 of the key-board frame, and are thus guided in their movements up and down. The upper ends of the finger-key sockets operate through guide-holes in the bed-plate or base A. It will be observed that the upper lever 6, which is connected to the connecting-rod 5, is alever of the third order, and that the lower lever 9, to which the finger-key is connected, is a le-= ver of the second order, and that these lovers are joined by the link 13 to operate simultaneously at each stroke of the finger-key.

In operation the finger-key is depressed and the free end of theleverf) vibrated downwardly. During the descent of the lever 9 the link 13, moving therewith, pulls down the free end of the lever (S, which in turn earriesalong the connecting-rod 5, and the latter, beingattached to the rear end of the type-lever, throws upwardly its lower type end to effect the printing of the paper upon the platen. On releasing the pressure upon the finger-key the parts all return to their normal position, a spring, suitably arranged, being provided for this purpose. The said spring may be located under the finger-key or under either key-1ever; or the spring of the universal bar (not shown) may be employed for returning the parts to the first position.

1t will be understood that in practice the transverse fulcrum-rods 7 and 10 extend entirely across the machine and support, respectively, all the key-levers 6 and 9.

By the combination of the levers 6 and 9 I am enabled to produce a type-wri tin g machine in which the depression of all the keys may be made uniform, and in which the power to be exerted for one key is the same as that for another.

Having now so fully described my invention that those skilled in the art may make and use the same, what I claim as new, and desire to secure by Letters Patent, is-

1. In a type-Writing machine, the key-lever 6, pivoted below and at the front of the keyboard, the key-lever 9, pivoted below the lever 6 and at the rear of the key-board, the connecting-link 13 uniting saidlevers between their pivots or fulcrums, a finger-key connected to the lever 9, atype-carrier, and arod connecting the type-carrier with the lever (3, as set forth.

2. In a type-writing machine, the combination of the transverse fulcrum-rods 7 and 10, the levers 6 and 9 thereon and pointing in opposite directions, the link 13, connecting apair of said levers, the type-carriers, aconnectingrod joining one of the type-carriers with one of the levers 6, and a finger-key for each of the levers 9, as set forth.

In a type-writing machine, the combination of the transverse rods 7 and 10, the le vers b and 9, the link 13, the slotted fingerkey support, the connecting-rod, and the typebar, substantially as and for the purpose set forth.

Signed at Springfield, in the county of Ilampden and State of Massachusetts, this 16th day of November, 1887.

II. E. CURTIS.

In presence of- JACOB FELBEL,

ANDREW W. STEIGER.

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