US1549107A - Type action for typewriters - Google Patents

Description

Aug. 11, 1925.

H. A. FOOTHORAP TYPE ACTION FOR TYPEWRITERS 2 Sheets-Sheet 1 Filed April 30, 1923 c I O fl. b NW. m

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Aug. 11,1925. 7 11,549,107

H. A. FOOTHORAP TYPE ACTION FOR TYPEWRITERS Filed April 30, 1923 2 Sheets-Sheet 2 Patented Aug. 11, 1925.

UNITED STATES PATENT orrica;

HARRY A. FOOTHORAP, OF HARRISBURG, PENNSYLVANIA, ASSIGNOR TO ELLIOTT- FISHER COMPANY, A CORPORATION OF DELAWARE.

TYPE ACTION FOR TYPEWRITERS.

Application filed April 30, 1923. Serial No. 635,677.

To all whom it may concern:

Be it known that HARRY A. FooTHoRAP, a citizen of the United States, residing at Harrisbur in the county of Dauphin and State of ennsylvania, has invented cer-' tain new and useful Improvements in Type Actions for Typewriters, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an improved type action for typewriting machines, and more particularly, to an actionof the down strike type ordinarily employed in What are known as flat platen typewriters.

The object of the invention is to prodi'lcc an action which, while being characterizedby extreme simplicity of construction and economy of manufacture will nevertheless embody the essentials of light touch, accelerated printing movement, and locking of the type bar in normal position.

To the accomplishment of this object, the invention resides in the construction and relation of parts to be hereinafter described,

the type ring 6 and has mounted at its op-,

posite end the usual type 7. Normally the type bar 5 stands in a vertical position as shown in Fig. 1 and rests against a buffer ring 8. The hub 9 of the type bar 5 has the usual short arm or projection 10 disposed bolow and in the rear of the type bar pivot 11 and is connected to the lower end of a draw wire 12, the upper end of which is connected to the end of the long arm 13 of a sub-lever'l i fulcrumed at 15 in a plane above the key lever and forward of the fulcrum thereof.

The normal relation of the connection 13 between the wire 12 and the lever 14 is slightly back of a line drawn through the lever fulcrum 15' and the connectionlO between the draw wire and the type arm, to effect the lccking of the type arm against rebound after it has been retracted. It will be seen that any tendency of the bar to rebound will be resisted by the fulcrum 15 of the lever 14: because the connections betweensaid fulcrum and the type bar connection 10 are substantially in line with, though slightly in rear of said fulcrum.

The short arm 16 of the cam lever 14'is formed with a cam slot 17 in which is arranged to play a roller pin 18 carriedby the key lever 1. The configuration of the slot 17 is such that the maximum leverage will be exerted at the first part of the printing stroke to overcome the inertia of the parts, this leverage being gradually decreased and the movement accelerated as the type bar proceeds on its excursion to the platen. A convenient mounting for thekey lever is in the form of a horizontal deck 19 carrying the guide 4 in the form of a combplate and having key lever bearing lugs 20, and cam lever bearing lugs21 dropped below the deck.

Forced alignment is secured by an alignment guide 22 which receives the type bar adjacent to the free end thereof as the type reaches the printing point,

Of course, the action is'provided with one or more retracting springs applied to the key lever or other part of the action;

It is thought that from the fore oing, the construction, arrangement anda vantages of my type action will be apparent but I reserve the right to eflect such variations of the illustrated structure as may fall within the scope of the claims.

What I claim is:

1. In a type action, the combination with a horizontally disposed key lever fulcrumed at its rear end, and a normally vertical type bar mounted below the. key lever, of a sublever connected to the type arm, and the slot and pin connection between the sublever and the key lever.

2. In a type action, the combination with a horizontal deck, a key lever and a sub-lever fulcrumed thereon, of a type bar fulcrumed below the key lever and intermediate of the ends thereof, connections between the type bar and the sub-lever, said connections being normally disposed to lock the type bar against rebound, and said sub-lever having a cam slot and a pin carried by the key lever and engaging said slot, the contour of i the cam slot in the sub-lever and its relation to the fulcrum of said lever and to the connection with the type bar being such that the movement of the type bar will be accelerated'during the movement of the key lever. v

3. In a type action, the combination with a key lever and a type-bar normally disposed substantially at right angles to each other, of a sub-lever connected to the typebar, and a slot and pin connection between the sub-lever and the key lever, the relation of said connection with the fulcrum of the key lever and with the connection of the type bar with-the sub-lever being such that the movement of the type-bar will be accelerated during the movement of the key lever.

4. In a type action, the combination with a key lever and a ty.pe bar normally dis-' posed in substantially right angular relation, of a sublever, connections between the type bar and the sub-lever, said connections being normally disposed to lock the type-bar,

against rebound, and a slot and pin connectionbetween the key lever and the sublever. The relation of said slot and pin connection to the fulcrum of the sub-lever and the key lever being such that the movement of the type will be accelerated during the movement of the key lever.

- 5; In atype action, the combination with a horizontal deck, a key lever anda sublever fulcrumed thereon, of a type-bar fulcrum'ed below the key lever and intermediate of the ends thereof, connections between the that the movement of the type-bar will be accelerated during the movement of the key lever.

In testimony whereof I hereunto aflix my signature.

HARRY A. FOOTHORAP.

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