US2064177A - Typewriting machine - Google Patents

Description

Dec. 15,1936. R, M PETRIN. 2,064,177

TYPEWRITING MACHINE Filed Dec. 6,1935

Patented Dec. 15, 1936 UNITED STATES PAT TYPEWR ITING MACHINE. Remo Walter Petrini, Hartford, Conn, assignor to Royal Typewriter Company, Inc.,' New N. Y., a corporation of New York 7 York,

Application December 6, 1935 Serial No. 53,236

9 Claims.

This invention relates to new and useful improvements in typewriting machines generally, although more particularly to a column stop unit and to the method of assembling the same.

The Myers and Handley Patent 1,926,165, Sept. 12, 1933, discloses a column stop unit wherein, should one of the stops become broken due to impact of said stop against the stop lever, it is necessary to first remove one end plate and then remove the stops until the broken stop is reached, before said broken stop can be removed and a new one substituted.

The principal object of the present invention is to provide a column stop unit wherein all of the stops are mounted for individual removal whereby should any stop become broken it can be readily removed and a new stop substituted.

Another important object of the invention is to provide removable means for preventingthe accidental removal of any of said columnstops. A further object of the invention is to provide a novel method of assembling the unit.

In the drawing: Figure l is a top plan view of a marginstop unit constructed in accordance with my invention,

Figure 2 is a view partly in front elevation and partly in section of said unit,

Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 2,

Figure 4 is a cross-sectional view showing the first step in assembling one of the margin stops on the supporting frame, V j I a Figure 5 is an enlarged sectional view similar to Figure 3, but showing the limiting stop removed,

Figure 6 is an enlarged rear elevationofthe unit showing particularly one of the intermediate tie plates for the frame rack bars, and also a the means of attaching one of the limiting or stop 1 plates to the upper rack bar,

Figure '7 is a cross-sectional view taken on the line 1-1 of Figure 6, t

Figure 8 is a view similar to Figure 6 but showing the column stop partially removed, Figure 9 is a perspective view showing tion of the upper rack bar,

Figure 10 isa perspective View showing one en of one of the limiting stop plates, and

Figure 11 is a cross-sectional view showing the initial step in assembling the rack bars and intermediate tie plates.

Referring to the accompanying drawing, A designates a column stop frame which is remova' porably mounted on the end plates 5, 5 of a typewriter carriage. This frame includes a pair of spaced upper and lower rack bars 6, 1 which are rigidly connected together at their ends by end plates 8, 8, and screws 9 which pass through the plates'into threaded openings in the ends of the bars. .Rigidly connected toeach plate 8 is an outwardly projecting threaded stud H) which is clamped to the adjacent end plate 5 of the carriage by nuts H. The frame A is held against turning by brackets which, as shown in Figures 1, 2, and 3, are secured to the end plates 5 of the carriage and to the frame. The rack bars 6, I are rectangular in cross-section except that the top surface l2 ofthe upper bar is transversely rounded throughout its length. [The lower face of the upper bar and the upper face of the lower .bar are respectively formed with grooves l3 and. M arranged in opposed pairs and spaced apart distances corresponding to letter space intervals. These bars are held against spreading actionsbetween their ends, by intermediate tie plates l5. Each tie plate is formed with spaced openings ;l. 6,. ll to'receivethe rack bars 6', 1 respectively, feachjopening being of a larger cross-sectional area than the associated rack bar. The upper surface 12 of the upper rack bar 6 and the lower surface [8 of the lower rack bar I, are formed with transverse seats 19, 20 for receiving the upper and'lower cross bars 2|, 22 of the tie plates to thereby interlock said tie plates with the rack .bars. I f Supported onthe frame A is a series'of column stops B, there being one of these stops for each pair of upper and lower grooves l3, l4, and

therefore these stops are located at letter space intervals.- Each-stop is of H-shaped construc- .tion and includes spaced and upwardly converging? frontand rear arms 23, 24, spaced and down'w ardly extending short front and rear legs 25, 26,"and.a cross bar or connecting portion 21. 3 Each] stop B is vvpositioned on the frame A so that the arms 23, 24 are disposed on opposite sides'of the upper rack bar 6 and the legs 25, 26 are disposed on opposite sides of the lower rack bar 1, 'the cross bar 21 extending between the "bars 6, l and into the upper and lower transverse igroove's l3, l4 thereof. The upper. ends of the arms 23, 24 are rounded and the distance between these ends is a trifle greater than the width of the upper rack bar. 6 so as to permit the stop to swing froman inactiveforwardposition to an active; rearward position or vice versa, the rounded ends constituting pivots or fulcra for ;,the stop. The le'gs 25, 26 are spaced apart a distance considerably greater than the width of the lower rack bar I so as to permit the stop being swung from one extreme position to the other, the legs cooperating with said rack bar to limit the swinging movement of the stop. The lower edge of the bridge portion 21 adjacent the rear leg 26 is angled and is provided with a flat 28 which rests on the bottom wall 14* of the groove l when the stop B isin its inactive or inoperative position. The lower edge of the bridge portion 21 between the front leg 25 and the fiat 28 is formed with a recess 29 to form a clearance and thereby permit the free rearward swinging of the stop B. The stop is retained frictionally in each of its extreme .positions, and to this end the stop is provided with a spring 30 which is in the form of a spring wire bent between its ends to form upper and lower spring arms 31, 32 respectively, the bend of the spring engaging a headed stud 33 which is attached to the right hand face of the stop. The arms 3|, 32 extend forwardly "between the upperrandlower rack bars 5, I and'the free end of the lower arm 32 is rebent as at 34 to engage the front edge of the stop directly above and rest upon a shoulder 35 formed on said stop. The free end of the upper arm 31 is curved upwardly and downwardly to form a cam which has sliding engagement with the lower face of the upper rack bar '6 when the stop is in its active position, and with the lower front corner of the upper rack bar when the stop is in its inactive position. Thus, the stop B is capable of being rocked rearwardly to an active position or forwardly to an inactive position, and yieldable means are provided for automatically and frictionally retaining the stop in either of its extreme fpos itions.

It will be noted'that the distance between the top wall 13 of each groove I3 and the upper edge of the bridge '21 of 'thela'ssociat'ed stop, is considerably greater than the length of the legs 25, 26 of the stop. Consequently, each stop can be readily removed from the frame A "by'first raising the stop bodily against the tension of the associated spring 33, and then by swinging the stop either forwardly or 'rearwardly to disengage the same from the frame. .In assembling the unit, each stop B -is first positioned "as in Figure 4 with the arms 23,,24 embracing the upper rack bar 6, and with pressure being exerted on the stop against the tension of the spring 38. The stop is then swung rearwardly to a position between "the rack bars 6, "I, and then released, as shown inFigure 3.

In order to prevent accidental removal of the column stop B, a displaceable limiting stop C is attached by screws 31 to the top surface 12 of the upper rack bar '6. This limiting stop'C is in the nature of an elongated plate which is transversely curved, and the"longitudinal.edges of the plate are disposed in the path of the upward movement of the column stops B, and function to prevent said stops being raised sufficiently to allow the stops toberemoved. When it is desired to replace any broken column stop, the limiting stop C is first displaced, the broken column stop is then removed in the manner above described, a new column stop is then applied, and the limiting stop C is then repositioned.

The method employed in assembling the unit is as follows: The upper and lower rack bars are first projected through the openings of the tie plates IS; the rack bars are then spread apart and the tie plates are then engaged in the transverse seats I9, 20 of the bars; the end plates 8, 8 are then con'nected'to the'bars while the bars are held in their spread relation; the column stops B, are then applied to the frame, and finally the limiting stop 0 is attached to the upper rack bar 6.

I claim:

1. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, and a plurality of column stops individually mounted for removal in the respective opposed pairs of grooves of the rackbars, said stops being transversely swingable from aninactive to an active position and vice versa.

2. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, a plurality of column stops individually mounted for removal'in the respective opposed pairs of grooves of the rack bars, and yieldable means cooperating with each stop and one bar for yieldably retaining the stop against the other bar, said stop being bodily movable towards the first bar and transversely swingable to a disengaged position with respect to the frame.

3. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in'a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse-grooves arranged at spaced intervals, a plurality of column stops individually mounted for removal in the respective opposedpairs of grooves of the rack bars, said stops being transversely swingable from an inactive to an active position and vice versa, and yieldable means cooperating with each stop and one bar for yieldably retaining the stop against the other bar, said stop being bodily movable towards the first bar and transversely swingable to a disengaged position with respect to the frame.

4. In a column stop unit for typewriting and like machines, the combination of a frame includ- "ing a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced inteiwalsfand a plurality of column stops individually mounted for removal in the respective opposed -pairs of grooves of the rack bars,each'stopcomprising spacedarms embracing the upper rack bar and having pivotal engagement 'therewith,' spaced legs embracing the lower rack bar and cooperating with the bar to limit the swinging movements of the stop, and a bridge connecting the arms and legs and disposed between the bars and slida'bly engaging in the upp'er'and lower 'grooves of the bars, and a spring mounted on each stop for-cooperation with the upper bar for frictionally retaining the stop against the lower bar in either extreme position of movement of the stop, the distance "between the upper edgeof the bridge and the top "w'aIl offthe associated upper groove being con- .siderably greater than the length of the legs whereby said stop can be raised bodily against the tension ofthe spring and then-swung transversely of the frame to a disengagedposition with respect to the latter.

5; In a column stop unitfor typewriting and like machines, "the "combination of'a 'frame-including a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, a plurality of column stops individually mounted for removal in the respective opposed pairs of grooves of the rack bars, said stops being transversely movable from an inactive position to an active position and vice versa, and a displaceable limiting stop mounted on one of the bars for cooperation with a plurality of column stops to normally prevent the latter from becoming accidentally removed.

6. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged ina fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, a plurality of column stops individually mounted for removal in the respective opposed pairs of grooves of the rack bars, yieldable means cooperating with each stop and one bar for yieldably retaining the stop against the other bar, said stop being bodily movable towards the first bar and transversely swingable to a disengaged position with respect to the frame, and a displaceable limiting stop mounted on one of the bars for cooperation with a plurality of column stops to normally prevent the latter from becoming accidentally removed.

'7. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, and a plurality of column stops individually mounted for removal in the respective opposed pairs of grooves of the rack bars, each stop comprising spaced arms embracing the upper rack bar and having pivotal engagement therewith, spaced legs embracing the lower rack bar and cooperating with the bar to limit the swinging movements of the stop, and a bridge connecting the arms and legs and disposed between the bars and slidably engaging in the upper and lower grooves of the bars, a spring mounted on each stop for cooperation with the upper bar for frictionally retaining the stop against the lower bar in either extreme position of movement of the stop, the distance between the upper edge of the bridge and the top wall of the associated upper groove being considerably V greater than the length of the legs whereby said to the latter, and a displaceable limiting stop mounted on the upper rack bar for cooperation with a plurality of column stops to normally prevent the latter from becoming accidentally removed.

8. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in a fixed and parallel relation and having their inner faces provided with opposed pairs of transverse grooves arranged at spaced intervals, and a plurality of column stops individually mounted for removal in the respective opposed pairs of grooves of the rack bars, each stop comprising spaced arms embracing the upper rack bar and having pivotal engagement therewith, spaced legs embracing the lower rack bar and cooperating with the bar to limit the swinging movements of the stop, and a bridge connecting the arms and legs and disposed between the bars and slidably engaging in the upper and lower grooves of the bars, a spring mounted on each stop for cooperation with the upper bar for frictionally retaining the stop against the lower bar in either extreme position of movement of the stop, the distance between the upper edge of the bridge and the top wall of the associated upper groove being considerably greater than the length of the legs whereby said stop can be raised bodily against the tension of the spring and then swung transversely of the frame to a disengaged position with respect to the latter, and a displaceable limiting stop mounted on the upper rack bar for cooperation with a plurality of column stops to normally prevent the latter from becoming accidentally removed, said limiting stop comprising a plate extending longitudinallypof the frame and attached to the upper surface of the upper rack bar, the longitudinal edges of the plate cooperating with the upper ends of the arms of the column stop to limit the upward movement of the latter. 9. In a column stop unit for typewriting and like machines, the combination of a frame including a pair of rack bars arranged in spaced parallel relation and with the transverse grooves thereof disposed opposite each other, end plates secured to the ends of the bars, column stops mounted in the grooves of the bars and movable transversely of the bars from an inactive to an active position and vice versa, said bars having transverse seats formed in their outer faces, and a tie plate connecting the bars and having interlocking engagement in said seats.

REMO WALTER PETRINI.

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