US765367A - Back-spacing attachment fo type-writing machines. - Google Patents

Description

No. 765,367. PATENTED JULY 19, 1904. W. A. PARKER.

BACK SPAGING ATTAGHMBNT FOR TYPE WRITING MACHINES.

APPLICATION FILED we. 25, 1903.

r0 MODEL.

W1TNESSES: [NVENTOR WM. By

Patented July 19, 1904.

PATENT OFFICE.

WILLIAM A. PARKER, OF VVAOO, TEXAS.

BACK-SPACING ATTACHMENT FOR TYPE-WRITING MACHINES.

SPECIFICATION forming part of Letters Patent No. 765,367, dated July 19, 1904.

Application fil d August 25, 1903.. Serial No. 170,724. (No model.)

To all whom, it may concern:

Be it known that I, WILLIAM A. PARKER, a citizen of the United States, residing at Waco, in the county of McLennan and State of Texas, have invented certain new and useful Improvements in Back-Spacing Attachments for Type-VVriting Machines, of which the following is a specification.

This invention relates to a back-spacing attachment for type-writing machines, and particularly to one having special utility on an Oliver type-writer.

To this end the invention has in view the provision of a simple, practical, and conveniently-operated spacing attachment designed to obviate the necessity of removing the hands from the keyboard when it is desired to back the carriage one or more spaces for corrections or insertions. plished by handling the carriage, which is inconvenient and entails a loss of time. The presentinvention permits this operation to be effected quickly and accurately.

Furthermore, the invention contemplates an attachment requiring no change whatever in the machine and which does not interfere in the least with the usual operation thereof.-

detail in perspective of the complete attachment removed from the machine. Fig. L is aperspective View of the complete attachment, showing the several elements thereof separated.

Like reference-numerals designate corresponding parts in the several figures of the drawings.

In carrying out the present invention the attachment as an entirety is fitted directly to Usually this is accomthe type-writing machine without changing any part of the latter. As the attachment possesses special utility in connection with an Oliver type-writing machine, this type of machine is illustrated in the drawings, and the same embodies in its general organization a traveling carriage l, which carries the escapement-rack 2, with which cooperates the spacing-pinion 3, controlled through the medium of the ordinary spacing mechanism, and which permits the carriage to be freely moved backward or to the right, as is common to most forms of type-writing machines. It is the purpose of the present invention to accom plish this backward movement of the carriage a space at a time through the medium of a finger-controlled attachment.

This attachment essentially comprises a supporting member 4, a finger-operated spacelever 5, and a pivotal spacing-clog 6. The supporting member is preferably in the form of an angled bracket which includes an attaching-plate 7, which is conveniently screwed or otherwise suitably fastened upon one side of the upright frame member 8, which in the Oliver type-writing machine is what is commonly known as the ribbon-throw upright and which is located within the central portion of the machine in rear of the keyboard, but in proximity thereto. The upper horizontal portion 8 of the supporting member or bracket 4 has pivotally mounted thereon the space-lever 5. The pivotal support 9 for said lever is arranged at an intermediate point between the ends thereof, and the lever-arm extending forwardly from the pivot 9 toward the keyboard is provided at its front terminal with a finger plate or button 10, which practically constitutes a part of the keyboard and may be easily reached by the operator extending the index-finger forward over the back row of keys.

The space-lever 5 is of an angled form, and upon the rear end portion thereof is pivotally mounted, through the medium of the pivot 11, the pivotal spacing-dog 6. The. spacingdog 6 lies in operative proximity to the escapement-rack 2 and is formed at one corner with a rearwardly-deflected thrust-tooth 12, adapted to be moved into engagement with the teeth of the rack and at the same time thrust in a direction for forcing the carriage backward. In addition to the thrust-tooth 12 the pivotal spacing-dog 6 is also provided at a point nearer its pivot with a short rearwardly-projecting check-tooth 13, which is adapted to come into engagement with the rack-teeth just before the carriage has finished its backward movement of one space to the right, thereby stopping the further movement of the space-lever and preventing the carriage from moving more than one space to the right at a time.

In further explanation of the short checktooth 13 it will be noted that the same is of less projection from the body of the dog than the thrust-tooth l2, and therefore comes into engagement with the rack-teeth a little later than the engagement of the thrusttooth. Without the check-tooth 13 there would be under extra pressure on the space-lever a tendency for the point of the thrust'tooth 12 to press farther into and against the rack-teeth, with the result of moving the carriage more than one space; but this tendency is checked by the check-tooth 13 coming into engagement with the rack-teeth just before the carriage has finished its movement of one space.

At its back edge the dog 6 is provided with an angled seat forming a holding-shoulder 14, adapted to fit against the upright frame member 8, so as to hold the dog in an inactive position when the space-lever is held in or drawn back to its normal position under the influence of the retracting-spring 15, connected, respectively, with the lever 5 and its support 4.

An adjusting-spring 16 of less strength than the spring 15 is connected, respectively, with the toothed portion of the dog and the lever 5, so that when the space-lever 5 is moved in a direction to carry the dog away from the frame member 8 the dog will be tilted upon its pivot or axis in a direction for carrying the thrust-tooth 12 into engagement with the teeth of the rack. The movement of the dog in this direction under the influence of the spring 16 is checked by the stop arm 16 thereof engaging with a stop projection 17 upon the space-lever.

When the finger-pressure is released from the space-lever, the spring 15 returns it to normal position, and the superior strength of said spring overcomes the said adjustingspring by drawing the dog against the upright 7 and causing it to tilt back to its inactive position.

From the foregoing it is thought that the invention and its action will be readily understood. It will also be understood that changes its rear end a self-adjusting spacing-dog normally restrained in an inactive position by engagement with said fixed member.

2. In a spacing attachment of the class described. the combination with the machine element bearing the escapement-rack, of a pivotally-supported space-lever arranged contiguous to the keyboard and carrying directly upon one end thereof aspaeing-dog provided with separate thrust and cheek teeth arranged one in advance of the other, and one being of less projection than the other from the body of the dog.

3. In a back-spacing attachment for typewriters, the combination with the escapementrack, a frame-upright directly adjacent to said rack, and a keyboard in front of the rack, of a single horizontal swinging space-lever arranged in the interval between the keyboard and rack and mounted upon the frame-upright, said space-lever having at its front end a finger-engaging portion and carrying directly upon its rear end a spacing-dog cooperating with the rack.

4C. In a spacing attachment of the class described, the combination with the machine element bearing the escapement-rack, and a frame-upright, of a spring-retracted and finger-actuated space-lever pivotally sustained upon said upright, and a spring-adjusted spacing-dog pivotally mounted upon one end portion of the space-lever and provided at one end with a thrust-tooth for engaging with the rack and also with a short check-tooth arranged in a different plane from the point of the thrust-tooth, said spacing-dog being further provided at its back edge with an angled holding shoulder or seat engaging with the frame-upright.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM A. PARKER.

Witnesses:

W. H. KENDALL, NORMAN H. SMITH.

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