US2579763A

US2579763A - Cushioned escapement support

Info

Publication number: US2579763A
Application number: US66672A
Authority: US
Inventors: Frederick W Schremp
Original assignee: Remington Rand Inc
Current assignee: Remington Rand Inc
Priority date: 1948-12-22
Filing date: 1948-12-22
Publication date: 1951-12-25
Anticipated expiration: 1968-12-25

Description

F. W. SCHREMP CUSHIONED ESCAPEMENT SUPPORT Dec. 25, 1951 2 Sl-IEETS-SHEET 1 Filed Dec. 22, 1948 ATTORNEYS Dec. 25, 1951 F. w. SCHREMP CUSHIONED ESCAPEMENT SUPPORT v 2 SHEETSSHEET 2 Filed Dec. 22, 1948 ATTORNEYS Patented Dec. 25, 1951 CUSHIONED ESCAPEMENT SUPPORT Frederick W. Schremp, Elmira, N. Y., assignor to Remington Rand Inc., New York, N. Y., a corporation of Delaware Application December 22, 1948, Serial No. 66,672

This invention relates to a construction for mounting a typewriter carriage escapement on the typewriter frame.

The invention provides a mounting for a typewriter escapement on the typewriter frame and includes means for absorbing the shock and materially reducing the noise produced in the operation of the escapement. The escapement mountlng provides means'for attaching the escapement bracket to the frame of the typewriter by resilient means and provides for limited movement of the supporting plate for the escapement relative to the typewriter frame and at the same time absorbs the shock producing this limited movement and normally maintains the supporting plate for the escapement in a fixed position with relation to the typewriter frame.

In carrying out this shock absorption and noise elimination in the mounting of the typewriter escapement, the supporting plate for the typewriter escapement may be mounted in surface contact with a plate portion or back portion of the typewriter frame and resiliently retained in frictional engagement against the back portion of the typewriter frame by any suitable means that will permit limited movement with the frictional engagement between the supporting plate and frame. Resilient members such as rubber plugs may be inserted in registering openings in both the escapement supporting plate and the plate portion on the typewriter frame in transversely extending relation so that these parts may be compressed into registering openings to have firm engagement with both plates about the portions defining the openings for absorbingshocks and relative movement of the supoprting plate and normally maintaining the supporting plate in a fixed relation with respect to the plate portion of the typewriter frame.

In the drawings:

Fig. 1 shows a rear elevation of the frame of a typewriting machine with the invention applied thereto, illustrating how the escapement assembly is supported on the back plate of the machine by the means provided by the invention, other portions of the typewriter being omitted.

Fig. 2 is an enlarged rear view of the escapement mechanism with the rocker bracket on which the mechanism is assembled shown in dot and dash lines for clearly illustrating the escapement assembly and the manner in which it is mounted on the rocker bracket and supporting plate according to the invention.

Fig. 3 is a side elevation of the structure shown" in Fig. 1, taken substantially on line 3-"-3 of Fig. l.v

4 Claims. (c1.197-s2) 2 Fig. 4 is an enlarged vertical cross-'sectio through'one of the cushion supports and supporting plate retaining members, taken, substantially on line 4-4 of Fig. 1 and illustrating the method of resiliently mounting the escapement mechanism on the back plate of the typewriter.

Fig. 5 is a horizontal cross-section through the pivotal mounting of the escapement rocker taken substantially on line 5-5 of Fig. 2.

Fig. 6 is a vertical cross-section taken substantially on line 66 of Fig. 2.

The typewriter frame construction and escapement mechanism illustrated in the drawings shows the construction in current commercial use on the Remington standard typewriter, model number 17, and illustrates the application of one form of the invention to this standard typewriter, although it is to be understood that it may be readily adapted to other makes of typewriters.

The escapement mechanism shown in the drawings has an escapement rocker bracket 1 mounting the escapement Wheel bearing shaft 2 for rotatably supporting the escapement wheel assembly 3. The escapement Wheel assembly includes escapement wheel 4, and gear 5 assembled in rigid relation. The teeth of gear 5 intermesh with the teeth of carriage supported rack bar 6.

Back bar 6 forms part of the carriage structure [El for receiving pivot screws ll carried by rockerbracket 1 for pivotally mounting rocker 9 on rocker bracket I. An arm 12 is pivotally mounted on rocker 9 and secured thereto by screw l3 threaded in rocker 9. The free end of arm I2 pivotally supports loose dog 8 at the upper end thereof as shown in Fig. 2 on pivot pin l4.

Loose dog 8 has an arm l5 formed with a tooth,

It on the free end for engagement with the radial teeth of escapement wheel 4 for controlling rotation of the escapement wheel. 'Loose dog 8 has a depending arm I! connected by tension spring 18 to bracket [9 formed with projections for limiting movement of loose dog 8 by engage-- ment with arm I5 so as to accurately guidearm l 5 in its movement on pivot pin [4 in controlling operation of the escapement wheel.

A toggle 2D has one end pivotally connected to arm 12 supporting loosedogB, about midway be-v tween pivot screw l3 and pin l4, while the opposite end is pivotally connected to rocker 9 by pivot screw 2!. A spring 22 has one end secured to the joint for toggle and the opposite end secured to rocker 9 for normally breaking the joint in toggle 28 and moving loose dog 8 with arm l2 to the right as shown in Fig. 2. When toggle 29 is moved into its straightened position it limits movement of loose dog 8 and arm 52 to the left as shown in Fig. 2, through carriage operation of the escapement wheel when one of the escapement teeth is engaged with projection lB'of dog 8.

A cushion plate 23 is mounted on the face of rocker 9 in opposed relation tothe adjacent face of rocker bracket I by pivot screw 2] at one end and by another screw at another portion thereof in spaced relation to screw 2|; Suitable rocker limiting screws are mounted in bracket l for engagement with cushion plate 23 in a manner well-known in the art for limiting the rocking movementof' rocker 9 on pivot pins H in operation of the escapement mechanism.

Compression sprin 24, Fig. 2, is engaged leetween the upper portion of rocker 9 and rocker bracket l for normally actuating rocker e in one direction on pivot screws H. Rocker 9 has a projection extending laterally therefrom for engagement by lever mechanism operated by the space bar of the typewriter for moving the rocker on pivot screws H in letter spacing operation of the carriage in a manner well-known in the art and as employed in theaforementioned Remington typewriter. Rocker 9 is formed with a recess 28, Fig. 2. for receiving a link operated by the universal bar of the typewriter retained in the recess by arm 2'5 which may have its free end moved upwardly, from the position shown in Fig. 2, to close the opening of the recess and retain the link operably engaged with rocker 9. The universal bar is operated in a well-known 'manner by the operation of a type bar of the wheel 4 in controlling letter spacing movement of. the carriage through rack bar 6. The spring drum for producin movement of the typewriter carriage in one direction in the usual manner fill a; the typewriter frame.

spacing operation in such a way that loose dog 8 with toggle 20 and arm 12 acts to arrest the movement of the carriage with the parts positioned, as shown in Fig. 2. at the end of each letter space movement. This operation of the escapement mechanism is well-known in the art. With rocker bracket I mounted on the frame of the typewriter in the usual manner wellknown in the art, the escapement operation produces a substantial amount of noise. It is the purpose of the present invention to provide a mounting for this escapement mechanismthat will substantially eliminate the noise and ab sorb vibration and shocks from the operation of the escapement mechanism and thereby produce a carriage and escapement operation of a substantially quiet character.

' One embodiment of the invention is illustrated in the drawings and provides a rocker bracket supporting plate 30 of substantially U-shaped construction. Supporting plate 30 has a pair of upwardly extending arms 3! with connecting portion 32 securin the lower ends together. Rocker bracket I is secured to the upper ends of arms 3|, as shown in Fig. 1, by means of suitable bolts and nuts indicated at 33. The es capementmeohanism is supported by'supporting plate 3& in the space between arms 3! above connecting portion 32, as clearly illustrated in Figs. 1 and 2, so that the parts associated with the escapement mechanism can be readily connected thereto with portions extending through the space between arms 31 to provide for the convenient mounting and operation of the typewriter parts associated with the escapement mechanism.

Rocker bracket supporting plate 30 is mounted with the inner face of the plate engaged with the rear face of back plate 34 of Plate portion '34 of the typewriter frame is constructed to provide'raoe to face contact with supportin plate'SD in order to fix the positionof supporting plate 30 with respect to the typewriter frame andto fixthe position of the escapement mechanism with respect to the other operating parts of the typewriter.

stantially beyond the shank portion and the shank portion is formed with a reduced threaded end providing ashoulder, see Fig. 4. The reduced threaded end of each screw 35 is threaded into an opening in back wall 34 so that washer 36 engages between the outer rear face of back.

. plate portion 3 and the shoulder onscrew 35.

is shown diagrammatically at 29 in Fig. 1, and

has the usual connection with the carriage.

In the operation of the typewriter the oscillating movement of rocker 9 will alternately disengage loose dog '8 from a tooth on escapement wheeltt and move'the rocker into position for engagement of fixed dog 28 with the released tooth on the escapem-ent wheel. Then upon further operation the rocker will move in the opposite direction to release the loose dog 28 from the tooth'engaged therewith and move projection It into engagement with the next tooth on escapeinent wheel 4 in completing one cycle of escapement operation and producing one letter space movement of the carriage under operation of the spring in spring drum 29. This movement of the carriage by spring drum'ZQ in cooperation with the movement of the parts of the escapement mechanism producesv the letter Each screw 35 extends through an opening in supportin plate 35, indicated at 37, Fig. 4.

Each of the openings 31"is larger than the shank of screw 35 extending therethrough in order to provide for limited edgewise movement of plate 36 relative to back plate 34 in frictional contact with back plate 34. Each screw 35 has a compression'spring 38 engaged between the head thereon and a washer 39 engaged with the relative to back plate 34 with frictional engagement of the plates tending to prevent the rela-- tive movement.

Supporting plate 30 is secured to back plate 3 3 by a plurality 'of shouldered screws. 35. Screws 35 have an enlarged head extending sub-' Compression spring 38 and washers 36 and As illustrated inthe drawings three screws 35with assembled springs 38;and.

washers

36 and 39 are used in securing rocker bracket supporting plate 3|] to back plate 34.

Plates and 34 are formed with registering apertures 40 in each arm 3| adjacent the lower end thereof immediately below a pair of the screws 35 securing the upper ends of the arms to back plate 34. Resilient rubber plugs 4|, Fig. 4, are inserted in registering apertures and have compression washers 42 engaged with opposite ends thereof on opposite sides of assembled supporting plate 3|! and back plate 34, as shown in Fig. 4. A compression bolt 43 threadedly receiving a pair of nuts 44 is arranged in axially extending relation through each rubber plug 4| and the associated compression washers 42 for tightening of the nuts 44 on each bolt 43 to compress resilient plugs 4| to firmly engage the peripheries or edges of supporting plate 30 and back wall 34 in registering apertures 40. This engagement of the rubber plugs with the edges of plates 3|] and 34 in the apertures 40 serves to firmly retain supporting plate 30 in a substantially fixed relation on the rear face of back plate 34 against relative movement, but permits of a slight edgewise movement of supporting plate 30 relative to plate 34 in frictional engagement therewith for absorbing shocks applied to plate 34 in the operation of the escapement mechanism and the carriage of the type- Writer. Rubber plugs 4| serve to return plate 3|] to its original position after each vibratory movement thereof in absorbing shock. It has been found that this mounting of plate 30 on plate portion 34 of the typewriter frame through the medium of screws 35 with compression springs 33 and compressed resilient plugs 4| not only absorbs the shock from the operation of the carriage and escapement mechanism but also absorbs noise vibrations transmitted through rocker bracket to supporting plate 39 and prevents tansmission thereof to plate portion 34 and the frame of the machine for amplification of the sound. As a result, the noise created by the operation of the escapement mechanism is reduced to a point where it is substantially eliminated with the little remaining sound caused by the operation changed in pitch to a degree where it is not objectionable to persons working near a machine during operation and does not effectively interfere with the work of these people. It is also less tiresome to the typist. A beneficial result is therefore secured, particularly in oflices where many typewriters are used.

The invention claimed is:

l. The combination in a typewriter having a main frame having a back plate and an escapement wheel and dog mechanism operably mounted on a bracket formed of a flat plate, of a cushioned escapement mounting comprising a supporting plate, means detachably mounting the plate forming said bracket with one face engaged with one face of said supporting plate, means for mounting said supporting plate with the opposite face in frictional engagement with one face of said back plate of said main frame for limited movement, said frame and supporting plate having registering apertures therein and shock absorbing means mounted in said registering apertures for retaining said plate against movement relative to said frame and absorbing shocks and impacts applied to said plate.

2. In a typewriter having a frame formed with a back plate and an escapement, a cushioned support for said escapement comprising a supporting plate mounted with portions in surface contact with said back plate, means. resiliently retaining said plates in frictional surface contact for limited edgewise movement, said plates "having aligned apertures therein, and resilient means engaged in said aligned apertures for normally retaining said plates against relative edgewise movement and absorbing shocks applied thereto by said escapement.

3. In a typewriter having a frame formed with a plate portion and a supporting plate for a carriage escapement, a cushioned mounting for said escapement comprising means for resiliently pressing said supporting plate into frictional surface contact with said plate portion for limited movement on the surface of said plate portion, said plate and plate portion having .registering apertures therein, and resilient members mounted in transversely extending relation in said registering apertures, engaging the edges of said apertures and absorbing shocks caused by relative movement of said supporting plate to said plate portion for substantially reducing noise produced in the operation of said escapement.

4. In a typewriter having a frame formed with a plate portion and an escapement mounted on M a bracket, a cushioned escapement support comprising a supporting plate having surface contact with said plate portion, means securing said bracket on said supporting plate for mounting said escapement, a plurality of attaching members mounted in spaced parallel relation on said plate portion and projecting through openings in said supporting plate, resilient members mounted on said members engaging said supporting plate about said openings and. retaining said supporting plate in frictional engagement with said plate portion of said frame, said plate portion and supporting plate having registering apertures, resilient plugs engaged in said registering apertures, and means for compressing said resilient plugs into contact under pressure with said plate and plate portion for cooperation in retaining said supporting plate attached to said plate portion and absorbing shocks and vibration from said escapement to substantially reduce the operation noise thereof.

FREDERICK W. SCHREMP.

REFERENCES CITED The following references are of record in the