US1376322A - Typewriter-eraser - Google Patents

Description

H. IVI. CUTSHAW.

TYPEWRITER ERASEH.

APPLICATION FILED APH. I5. 1920.

Patented Apr. 26, 1921.

2 SHEETS-SHEET l.

W .W FM

H. IVI. CUTSHAW.

TYPEWRITER ERASEH.

APPLICATION FILED APR. I5. I920.

1,376,322. Patented Apr. 26, 1921.

2 SHEETS-SHEET 2.

wihwoo PATENT OFFICE.

HOWARD H. CUTSHAW, 0F GBEENEVILLE, TENNESSEE,

' Specification of Letters Patent.

Patented Apr. 26, 1921.

Application led A pril 15, 1920. Serial No. 874,096.

To all 'whom it may concern.'

Be it known that I, HOWARD M. CU'rsHAw, a citizen of the United States, residing at Greeneville, in the county of Greene and State of Tennessee, have invented a new and useful Typewriter-Eraser, of whichthe following is a specification.

It is the obj ect of this invention to provide novel means whereby an eraser on a .typewriter may be brought downward by the action o a key, into coperating relation with the platen, rotation being imparted to the eraser.

It is within the province 'of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scopel of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings lFigure 1 shows in perspective, a portion of a typewriter equipped with the device formi the subject matter of this application; 1g. 2 is a fragmental front elevation of the arm, the eraser and attendant parts; and Fig. 3 is a fragmental section taken through a typewriter from the frontto the back, the view depicting the device forming the subject matter of this application as it will appear when the eraser has been lifted with respect to the platen.

The numeral 41 denotes the frame-of an Oliver typewriter, the frame including an upstanding U-shaped member 2 at which one bank of type-levers terminates. The keys of the typewriter are indicated .at- 3 and the space bar appears at 4, the numeral 50 in Fig. 3 indicating the platen-all as common in an Oliver typewriter.

In carrying out the'present invention, a.

U-shaped arm 5 is fulcrumed as indicated at 6 on the member 2. The arm 5 may comprise, as shown in Fig. 3, coperating parts 46 having parallel flanges 47. The arm 5 has an ofset 7 to which a link 8 is connected, the link 8 being united with a ke lever 9 fulcrumed at 10 on the framewor 1 of the machine, the numeral 11 indicating any suitable spring means for raising the key lever 9. Generally stated, the foregoing construction embraces merely the key mechanism of the well known Oliver typewriter.

The numeral 12 denotes an electric motor having a bracket 14, one end of which is received between the anges 47 of the parts 46 of the arm 5, securing elements 15 connecting the flanges 47 with the bracket 14. The bracket 14 is provided with an outstandlng bearing 16 wherein the shaft 17 Aof the motor 12 is journaled. A shaft 18 is disposed at right angles to the motor shaft 17 and is j ournaled in the end of the bracket 14. There is a beveled pinion 19 on the shaft 18 the pinion 19 meshing with a beveled pinion 20 on the shaft 17. An eraser 21 of circular outline is mounted on the shaft 18 and abuts against the beveled pinion 20, the eraser 21 being held in place by a thumb nut 22 threaded 'on the outer end O the shaft 18.

The numeral 23 indicates a conductor constituting part ,of an electrical circuit in which the motor 12 is located,l the circuit comprising a source of electrical energy indicated at 24. A switch 25 is mounted on the frame 1 of the typewriter in operative relation to the key lever 9, the switch 25 being interposed in the circuit of which the conductor 23 forms a part. The switch, of course, may be of any desired construction but, if not expedient, it may include a button or plunger 26 located beneath the lever 9.

In practical operation, when the free end of the key lever 9 is depressed, the link `8 swings the arm 5l on its fulcrum 6 and brings the eraser 21 into engagement with the paper on the platen 50. When the key lever 9 is depressed, the switch 25-26 closes the circuit of which the conductor 23 forms a part, the motor 12 being energized, and rotation being imparted to the eraser 21 the beveled pinion 20, the beveled pinion 19 and the shaft 18. 4 As soon as pressure on the key lever 9 is released, the spring means 11 reacts and moves the arm 5 into the elevated position of 'F ig. 1,' the circuit at the switch 25-26being broken at the same time.

Having thus described the invention, what is claimed is 1. In a typewriter, a frame; an arm pivoted to the frame; a key movably mounted on the frame; means for connecting the key with through the instrumentality of the shaft 17,

the arm; a -motor mounted on the arm; an eraser driven by the motor and carried by the arm; and means responsive to the movement of the key`for starting and stopping the motor. n y

2. In a typewriter, a frame; an arm pivoted to the frame; a key movably mounted on ythe frame; means for connecting the key with the arm; an electrical motor; an eraser driven by the motor and carried by the arm; an electrical circuit including the motor; and means responsive to the movement of the key for opening and closing the circuit.

3. In a typewriter, a frame; an arm pivoted to the frame; a key movably mounted on the frame; means forconnecting the v'key with the arm; an electrical motor mounted on the arm; an eraser driven by the motor and carried bythe arm; an electrical circuit including the motor; andmeans responsive to the movement of the key for opening and closing the circuit.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

HOWARD M. CUTSHAW.

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