Патент USA US2120360код для вставки
June 14, 1938. ' ' - v.1. L. HILLIS TYPEWRITING . MACHINE 2,120,360 ~ ' -' Filed Dec. 5, 1955 ——>l2s ‘ “Wk ATTORNEY 2,120,360; Patented Junel4, 1938 UNITED "STATES ‘PATENT, orrlcr. - James L. Billie, TYPEWRITING Rochester, N. Y., asijnoc to In tel-national Business Mnchincc . Corporation, New York, N. Y., a corporation of New York Application December 5,1935, Serial No. 52,903‘ lclaim. (01. 191-123) ' This invention relates to improvements in the longitudinal axis of the platen. The recess it variable'line-spacing clutches commonly used in serves merely to give lightness to the hub l2, connection with the platens for typewriters, add while the central, thin-walled elongated housing ing machines, accounting machines, and other ‘ 5 ports It formed and guides by borethel4 clutch and recess operating i5 partly elements. sup- . 5 o?ice machines. The principal object of the invention is to pro The usual line spacing ratchet I1 is rotatably vide a variable spacing clutch which is extreme mounted on a shoulder I8 formed in the hub l2. ly simple yet positive and reliable in its action. The line space ratchet H in some cases may be Another object is to provide a variable spacing . replaced by a gear driven by some suitable platen m clutch which is cheaper to manufacture and, rotating device such as is commonly provided in assemble and requires less servicing than prior bill-feeding attachments of various kinds. A clutches‘of this ‘type. disc I 9 is secured to hub l2 by four screws 20 A iurther object is to provide a variable spac threaded into holes in the hub 12 adjacent the ing clutch which has few tapped or threaded slot I3, the ratchet l1 turning freely on shoul 15 parts and no rivets whereby the clutch may be der l8 between the disc l9 and the radial wall very quickly assembled, or disassembled‘ for of the shoulder. ' cleaning, repair, and lubrication. _ Secured to disc [9 is a tube 2| which, with disc Another object is‘ to provide a variable spac I9, acts as a trunnion to rotatably support the ing clutch which is a self-contained unit and hub 12. The usual platen rotating knob 22 is 20 does not require an especially bored platen core, attached to tube 2| by means of two set'screws a a tapped or threaded platen core, or a straight 23 which engage ?ats milled in the- tube 2| through platen shaft. ' ' A‘ short sleeve 24 is loosely mounted on the An object is to provide a variable spacing tube 2| between the disc 19 and the knob 22 clutch which can be used with a platen which and serves as a bearing for the platen. 'In 25 consists of a ‘metallic tube supporting a shell of the “electromatic” typewriter, the sleeve 24 rests rubber or other suitable material. on a yoke secured to the left-hand carriage side Various other objects, advantages, and fea tures of the present invention will be speci?cally _ pointed out in the following description and 30 claim, or will be apparent from a study of the speci?cation, claim and drawing. ' In the drawing: Fig. 1_ is a longitudinal section of one end of a platen with the improved clutch‘ attached. 35 Fig. 2 is a section‘ in the plane designated by the line 2-2 in Fig. 1. Fig. 1 is any irregular section formed by two planes intersecting'in the longitudinal axis of the platen and located by the lines |—l in Fig. 2, 40 in order to show as much of the clutch as possi ble in one view. > . The platen core may comprise a metallic tube It supporting a striking surface or shell H which ‘may consist of a tube of rubber or 4.5 other suitable resilient material in accordance with the usual practice in the art. Forced into one end of the tube In is a platen supporting hub l2 which may be made of a die-casting of some light alloy such as “duralumin” and simi 5o lar light alloys, or the hub may be turned from bar stock, as desired. Y _ , The'hub l2 has a rectangular slot l3 formed . transversely of the axis of rotation of the platen, a central bore I4, and an annular recess IS; the “ bore it and recess I5 ‘being concentric with the 10 15 _ 20 , 25 plate and is held in place on said yoke by means of a spring catch. - ‘ ' . ‘Slidably mounted within the tube, 2| and in a concentrically located hole in housing It, is a 80 push rod 25 having a ?nger button 28 secured-to its left-hand end. Preferably the knob 22 and. ?nger button 26 are molded on metallic hubs and made of some composition such as hard rub ber, phenolic condensation product, and simi- 35 lar materials. Near its mid-point the push rod ‘ 25 has a shoulder 21 abutting a clutch element . 20. The hub of the clutch element 28 has a di ametrically cut slot engaged by a pin 29 loosely received in a transverse hole in push rod 25. 40 The clutch element 28 is oblong in general shape as viewed in Fig. 2 and ?ts loosely in the slot l3 in hub 12. A pair of guide pins 30, pressed into holes 3| located in hub l2 on opposite sides 7 of the push rod 25, loosely engage holes in the 45 clutch velement 2t and permit said element to slide freely axially of, hub l2 without, however, friction between the straight edges of vsaid ele ment and the walls of slot l3. . The ratchet I‘! has an'internal ?ange or rib 32 I 50 which is conically surfaced opposite push rod 25 and knurled with line teeth. The rounded ends-7 of clutch element 28 are conically surfaced and similarly knurled so as to be engageable with the ?ange 32 for driving purposes. A spring 33, in- 55 2 terposed between a washer 34 abutting ‘pin 29 f jrequired for a core. A straight-through platen and the housing It, normally- presses push rod I ‘shaft is not necessary and in its steada short 25 and-clutch element 28 to-the lei't (Fig. 1) _ to._ length of shaft pressed into a suitable hub which hold clutchtheelement knurledinsurfaces "firm contact," in‘ ratchet, thusi1‘positively and said - in turn is pressed into the platen core may be '_ used to support the-platen core at the end oppo coupling the platen to ratchet l'l. When the. '_ site the clutch. The cost of the platen, viewed as finger button 25 is pushed inwardly,‘ that is, toi . an assembled unit for placementin the carriage, ward. knob 22, the push rod 25 is‘. forced‘ to the ‘isrthus vvery much reduced. right (Fig. 1) moving the clutch element-[Rout - It will be noted in Fig. 1 that the" push rod :5 10 of engagement with the ratchet I‘! as shown in is considerably smaller in diameter than the bore 10 broken lines in Fig. 1. The knob 22 may now be . of the tube 2| and the hole in housing 16 except turned, while holding button 25 in its inward ' near the left-hand end of tube 2| where at 25 the position, to rotate the platen independently of push rod is enlarged to loosely fit the bore of the the ratchet l1. ‘ a tube. Thus, the push rod has virtually a uni 15 It will be noted that, with the possible exception versal mounting at its outer end so that the inner of the hub I2 and the molded part of button 25, end can ?oat ‘slightly whereby the knurled sur all the parts of the clutch are turned parts which faces of clutch element I1 and 28 are virtually _ can be made from bar stock on screw machines self-allgning._ This ensures firm seating of the requiring very few ?nishing operations such as 20 clutch elements and a positive engagement be tapping, milling, and reaming. Thus, the parts ‘tween them. This construction also avoids the 20 themselves are very cheap to manufacture. The necessity for accurately ?tting many of the parts clutch may be very quickly assembled and dis assembled since only four screws 20, or even less if desired, are required to holdit securely in as The inner end of the push rod 25 is conical to facilitate the assembly oper ation to avoid the necessity for “?shing” for the 25 sembled relation. hole in housing It when inserting the push rod. Since pin 29 is loose in the hole in push rod 30 25 and its slot in hub i2, an expensive pinning operation entailing drilling the hub of clutch ele ment 28 and push rod 25 is eliminated. In spite of the fact that pin 29 is loose, it cannot come out after the screws 20 have been turned upright as 35 the central bore i4 is too small to permit the pin moving any appreciable amount laterally of the push rod 25. ' and permits a cheaper cost of production due to the wider tolerances permitted in many of the dimensions. ‘ While there has been shown and described and 25 pointed out the fundamental novel features of the invention as applied to a single embodiment, it will be understood that various omissions and substitutions and changes in the form and de tails of the device illustrated and in its operation 30~ may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be ‘limited only as in dicated by the scopeof the following claim. What is claimed is as follows: » 35 A line spacing clutch comprising a rotatable support, a platen rotating member freely rotat In spite of the fineness of the knurled teeth in clutch element 28 and ratchet t1, the clutch is able on said support and having a knurled clutch surface, a clutch member slidably mounted on '40 positive and atthe same time a very fine degree said support and having a knurled clutch surface .40 of adjustment of the platen relative to ratchet i1 engaging the clutch surface in the platen rotat is possible. There is no tendency for the platen - ing member; a push rod coaxial with‘ said sup to slip as is common in clutches depending solely. port and engaging the clutch member, said push upon surface friction and one or more heavy rod being loosely mounted in a bore in said sup springs to produce the gripping‘ pressure. port and passing through the clutch member While the clutch is composed of sturdy parts whereby the push rod and clutch member ?oat of ample size and strength, it is very compact slightly relative to said support to permit even and does not increase the length of the platen seating of the knurled surfaces; and a spring or reduce its capacity as to length of line. Since . housed in said bore and holding said surfaces in almost the entire clutch is housed in the hub i2, engagement. ' an expensive, especially bored platen core is un necessary and a simple metal tube is all that is ~ JAMES L. HILLIS.