US634433A

US634433A - Type-writing machine.

Info

Publication number: US634433A
Application number: US72778398A
Authority: US
Inventors: Robert Turner
Original assignee: Individual
Current assignee: Individual
Priority date: 1898-08-29
Filing date: 1898-08-29
Publication date: 1899-10-03
Anticipated expiration: 1916-10-03

Description

No, 684,433. P atented Oct. 3, I899. n. TURNER.

TYPE WRITING MACHINE.

(Application filed Aug. 29, 1898. Renewed Aug. 19, 1899.

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Patented Oct. 3, [899.

R. TURNER. TYPE WRITING MACHINE.

(Application filed Aug. 29, 1898. Renewed Aug. 19, 1899.)

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TYPE WRlTlNG MACHINE. (Application filed Aug. 29, 1898. Renewed Aug. 19, 1899.)

Patented Oct. 3, I899.

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UNITED STATES PATENT Onnrcn.

ROBERT TURNER, OF DES MOINES, IOlVA.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 634,433, dated October 3, 1899.

- Application filed August 29,1898.- Renewed August 19,1899. Serial No. 727,788. (No model.)

To all whont it may concern:

Be it known that I, ROBERT TURNER, of Des Moines, in the county of Polk, in the State of Iowa, have invented new and useful Improvements in Type-Writing Machines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to type-writing machines, and particularly to the action thereof, whereby the impression -blows are struck.

My object is to produce an improvedaction embodying vertically-guided finge r-keys,vertically-movabl'e key-levers adapted to slide longitudinally, auxiliary bell crank levers connected to and vertically-actuated by said key-levers, type-bars suitably mounted, and draw-bars connecting them to said auxiliaries. The auxiliaries are mounted in alternation upon suitable parallel supports below the keylevers and one arm of each is suitably connected to a spring, upon which tension is pro duced or increased when a key-lever is depressed, whereby said spring aids in both returning the several parts to their normal positions and there maintaining them.

It is constructed as follows, reference being had to the accompanying drawings,in which- Figure 1 is a vertical sectional detail of a type-writing machine, showing sufficient of the working parts to illustrate this invention. Fig. 2 is a top plan, partly in section, on line at so, Fig. 1, of a few of the auxiliary bell-crank levers and their mounting in alternation. Fig. 3 is a vertical sectional detail on line y y, Fig. 1, illustrating their mounting. Fig. 4 is a vertical sectional detail of a key-lever, a bell-crank, a connection between them, and a draw-bar, as upon lines ,2 in Fig. 1. Fig. 5 is a detail in side elevation, enlarged,0f a slotand-pin joint or connection between the keylever and the stem of the finger-key. Fig. 6 is a vertical section thereof. Fig. 7 is a detail in side elevation, enlarged, of a slot connection between said parts. Fig. 8 is a vertical section thereof.

A is a suitable frame for a type-writing machine, having a suitable type-bar ring 2, in which suitable type-bars 3 are journaled, here indicated as concentric to the printing-point upon the impression-platen at, and 5 is a suitable basket-rim g.

Upon the base of the frame parallel bars 6 7 are erected,each havinga longitudinal groove 8 and vertical transverse notches intersecting said grooves, which receive the tailpieces 9 of the bell-cranks 10, their trunnions 11 fitting in said grooves 8, forming a hinge or pivot bearing for each bell-crank, said cranks being arranged in alternation, as shown in Fig. 2. Suitable draw-bars 12 connect said bell-cranks to said type-bars. Suitable springs 13 connect the short arms of each pair of bell-cranks,

whereby each spring controls two type-bars to normally hold their short arms againstsuitable stops 14 or against the basket-ring, but will permit either type-bar to be operated. Suitable finger-keys 15 are mounted in the frame, their stems passing through guidebars 16 across the frame, and the shank of each is suitably connected to a key-lever 17, as by an ordinary slot-and-pin joint a,Figs. 5 and 6, or by'an ordinary slot connection 1), Figs. 7 and 8. The rear end of each key-lever is provided with an adj usting-screw' 18, which has a bearing frictionally against a cross-bar 19 and is free to slide more or less thereon when the leveris operated. A link 20 connects each key-lever to a bell-crank. Cross-bars 21 operate as stops to the upward movements of the key-levers and can be provided with a suitable cushion to reduce the noise of operation. It will thus be seen that the bell-cranks are spring-connected in pairs,whereby the tension of the spring is exerted both Ways against separate cranks,so that each does double work. It will also be evident that the bell-cranks can hook over and swing upon a rod common to all of them in each set, instead of using trunnions. The key-levers are thus respectively under equal spring tension, requiring the equal force of stroke to depress a finger-key, its stem, its key-lever, its bell-crank, to which it is link-connected, and the corresponding draw-bar to impel the proper. type-bar to make an impression. The bell-cranks are arranged in two sets. The bearing common to one set is parallel to that of the other set, The links of each set are equidistant from the bearing and equidistant from the fulcrum of each key-lever, and the draw-bars connected to the bell-cranks are at the ends of the long arms of the bellcranks and equidistant from the links and lever-fulcrums, and the lever-fulcrums are arranged in sets corresponding to the bell-crank bearings, all of which results in an absolute uniformity of action and evenness of force of stroke to operate each type-bar. These are a part of the advantages or purposes of the auxiliary or bell-crank levers beneath and connected to the key-levers, the spring tension being exerted directly upon the bellcranks and through the links upon the key-levers, drawbars, and type-bar arms or levers, whereby each single spring supplies tension to two key-levers.

It will be evident that each pair of the screws 18 by being adjusted will produce the same tension upon each spring 13 and each pair of key-levers, and that by using some device of the nature of a dynamometer the tension of the several pairs canbe made the same, so that the force to operate any key will be the same as that for any other key. Each screw operates upon one end of each spring through the key-lever, link, and bellcrank, and in case there is any slight variation in any spring either in length or strength the screws can make the tension of all the springs the same by regulating the distance of the rear end of each key-lever from the plate 19.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a type-writingmachine, the combination with a vertically-guided finger-key, of a key-lever connected thereto, having a sliding fulcral bearing at its rear end, a bell-crank mounted below and connected to said keylever by a link, a spring connected to one arm of said crank, and a type-bar suitably connected to the other arm of said bell-crank.

2. In a type-writing machine, the combination with a pair of key-levers, of a pair of bell-cranks arranged in alternation and links connecting their long arms respectively to said key-levers, of a spring connecting the short arms of said cranks and exerting its tension upon both of said cranks and levers, and typebars suitably connected to said bellcranks.

3. I11 a type-writing machine, the combination with the key-levers, of auxiliary bellcrank levers connected to them, and springs coupling said bell-cranks in pairs, whereby each spring exerts its force upon two keylevers, and type-bars suitably connected to said bell-cranks.

4. In a type-writing machine,an action com prising key-levers, auxiliary bell-crank levers connected thereto, type-bars connected to said bell-cranks, and springs coupling said bell cranks in pairs, whereby each spring does double work in returning the other members of the action to their normal positions.

5. In a type-writing machine, an action comprising key-levers, auxiliary bell-crank levers connected thereto, type-bars connected to said bell-cranks, and springs coupling said bell-cranks in pairs, whereby each spring does double work in returning the other members of the action to their normal positions, and steps against which said type-bars are normally held by said springs.

6. In a type-writing machine, an action comprising longitudinally-sliding and verticallyoscillating key-levers, auxiliary bell-crank levers connected thereto, type-bars connected to said bell-cranks, and springs coupling said bell-cranks in pairs, and exerting their forces to lift and slide each key-lever separately and to separately return each type-bar to its nor mal position.

7. In a type-writing machine, an action com prising longitudinally-sliding and verticallyoscillating key-levers, auxiliary bell-crank levers connected thereto, type-bars connected to said bell-cranks, and springs coupling said bell-cranks in pairs, and exerting their forces to lift and slide each key-leverseparately and to separately return each type-bar to its normal position, and means to adjust the rear bearing of each key-lever and regulate the tension of said springs.

S. In a type-writing machine, a main frame, parallel longitudinally grooved and transversely-notched bars erected thereon, and bell-crank levers having their pivotal bearing alternately in said bars, in combination with key-levers connected to said cranks, and type-bars also connected thereto.

9. In atype-writing machine, a main frame, parallel longitudinally -grooved and transversely-notched bars erected thereon, bellcrank levers pivoted upon said bars, and springs connected to said bell-cranks, in combination with key-levers, and type-bars separately connected to said bell-cranks.

10. In a type vriting machine, a main frame, parallel longitudinally-grooved and transversely-notched bars erected thereon, bell-cranks pivoted upon said bars in alternation, and springs coupling said bell-cranks in pairs, combined with key-levers and typebars separately connected to said bell-cranks.

In witness whereof I have hereunto set my hand this 12th day of August, 1898.

ROBERT TURNER.

Witnesses:

WM. MILLER, GEORGIA WHITE.