US2782895A - Detachable cover hood for a typewriting machine - Google Patents

Description

'Feb. 26, 1957 2.. WINTER El'AL 2,782,895

DETACHABLE CQVER HOOD FOR A TYPEYIRITING MACHINE Filed Feb. 17. 1954 3 Sheets-Sheet 1' m'vsmons a WW ATTORNEYfi.

Feb, 26, 1957 0. WINTER :rm. 2,732,895

' DETACHABLE COVER H001) FOR A TYPEWRITING MACHINE Filed Feb; 17, 1954 3 Sheets-Sheet 2 INVENTORS. 'azzam ju'a g 5 ATTORNEYS.

Feb. 26, 1957 0. WINTER EI'AL 2,782,895

DETACHABLE COVER HOOD FOR A TYPEWRITING MACHINE Filed Feb. 17. 1954 a Shegts-Sheet 3 do 7 g- INVENTORS:

ATTORNEYQ DETACHABLE COVER HOOD FOR A TYPEWRITING MACHINE Otto Winter and Guido Dassler, Wilhelmshaven, Germany, assignors to Olympia Werke Aktiengesellschaft, Wrlhelmshaven, Germany, a corporation of Germany Application February 17, 1954, Serial No. 410,997

7 Claims priority, application Germany February 21, 1953 3 Claims. (Cl. 197-186) This invention relates to a typewriting machine in which the operating mechanism and the automatic ribbon mechanism are covered by means of a detachable cover hood.

It has been known to provide detachable cover hoods for the top front portion of typewriters so as to enclose the ribbon spools and the operating mechanism interconnecting the keys and the. type bars. Such cover hoods are of a general domed configuration and are provided with a central open portion in the shape of an arcuate segment facing the platen to allow the type bars to rise into printing relation with the platen. The manner in which the cover hood may be opened or removed from the machine varies, but in general may require the operator to lift the hood vertically from the machine frame or to slide the hood away from the platen in the direction of the keyboard, or to raise or swing the hood in the direction of the platen. In most instances, the cover hood is secured on to the typewriter frame or to the automatic ribbon mechanism by means of pegs on the hood which rest in open spring sockets on the machine so that when the cover hood is detached, damage and bending of the machine or of the hood may come about as a result of pulling the pegs out of the spring sockets.

This damage may result, for example, in the malfunctioning of the automatic ribbon mechanism and/or it can lead to the cover hood no longer fitting exactly into its attached and closed position.

It is an object of this invention to avoid the short comings of the prior devices, and to provide a swivel connection between the cover hood and machine which readily permits the opening and detaching of the cover hood without requiring the use of complicated mechanical linkages, and which further insures against any possible damage to the hood or machine.

It is a general object of the present invention to provide an improved form of fastening for a cover hood so that the latter may be raised or swung up in the direction of the platen upon swivel hinge pegs, with provision for detaching the hood at such hinge points.

A further object of this invention is to devise a twopart assembly consisting of hinge pegs fastened on the cover hood, and cooperating socket plates on the machine frame into which these pegs may be releasably secured.

A specific object of this invention is to provide springloaded socket plates on the machine frame which perform the dual function of securing the cover hood to the machine, and of acting as guides for the alignment of the cover hood with the machine frame when the former is replaced after removal from the latter.

Further details of the invention will be apparent upon reference to the detailed description which follows taken together with an example of a preferred embodiment of the fastening assembly shown in the drawings.

In such drawings, Fig. 1 is a perspective view of a typewriting machine equipped with an embodiment of the invention; a part of the cover hood being broken away;

nited States Patent T 2,782,895 Patented Feb. 26, 1957 Fig. 2 is a fragmentary view, on an enlarged scale perspective, of the cover mounting arrangement on the right inner side of the machine;

Fig. 3 is a fragmentary side view of the cover hood at an intermediate stage of attachment to or removal from the left side of the machine casing;

Figs. 4 and 5 are fragmentary views of a peg on the right side of the cover hood; Fig. 4 being a section on line 44 of Fig. 5;

Figs. 6 and 7 are views of a socket plate and slide attached to the right sides of the machine casing; and

Fig. 8 is a top view of the same.

In Fig. l of the drawings, the reference numeral 1 identifies a cover hood having angle brackets 2 secured, for example by spot welding, to its lower surface near the rear and at each side thereof. The brackets have elongated openings 2a in which swivel hinge pegs 3 are adjustably fixed by lock-washers 4 and nuts 5. The pegs 3 serve to support the cover hood on members secured to opposite sides of the typewriter casing 6.

Referring particularly to Figs. 2 and 5, each pivot peg 3 has a cylindrical section 3a projecting outwardly from the conical face 31) of a larger diameter intermediate section which has a large bearing surface for seating against its associated bracket 2, and an inner threaded section 3c which extends through the slot 2a of the bracket.

The socket plates 7 are secured, for example by spot welds w, to the inner sides of the casing 6 and their upper portion are displaced inwardly towards the center of the machine by offsets as shown in Fig. 7. The upper end of each socket plate has a relatively deep recess 7a and horizontal forwardly opening socket 7b to receive one of the pivot pegs of the cover hood. The socket plates preferably are reinforced by reversely bending a tongue 70 to provide a double thickness of metal adjacent the socket 712, and a lug 7d extends from the other side of the recess 7a to form a spring hanger. The slide 8 is secured to the socket plate for limited vertical movement by a screw 10 which passes through oblong opening 8b in the slide. A nose 8e at the lower end of this slide extends through an opening 72 in the socket plate to act as a guide for such vertical movement, while lug 8d is so positioned as to lie below companion lug 7d, with a pull spring 9 fixed between said lugs to retain the slide normally in upward position. The upper portion of slide 8 serves to latch the peg end 3a in the socket plate opening 7b when the hood is secured to the machine, and for this purpose has an offset tongue 8a which lies in the same plane as the socket 7b and normally closes the opening thereof. The extreme upper edge of the slide is rounded to facilitate the insertion of peg 3 into socket plate 7 when replacing the hood, and also furnishes a convenient means for pushing down the slide against the action of spring 9 when it is desired to remove the hood from the machine.

The manner in which the two-part assembly of this invention i used to secure the detachable cover hood to the machine casing will now be apparent. It will be noted that each peg 3 is positioned in bracket 2 in such a manner that its cylindrical extremity 3a points toward the outer edge of the machine. To secure the hood onto the machine casing, pegs 3 are superimposed upon the upper portion of slide 8, with the peg portions 3a resting on top of tongues 8a. Conical sections 3b of the pegs aid in the initial alignment of the cover hood over the casing, and also act to prevent lateral shifting or bending of such hood after it is closed over the machine. The contour of upper edge 80 of the slide also serves to assist in the initial alignment of the hood. By now exerting a light downward pressure on the cover hood slides 8 are moved down against the action of springs 9 to allow peg parts 3a to fit into sockets 7b as the hood is slid rearwardly toward the platen. When slides 8 are pushed down, the upper edge of each tongue 8a lies in the same plane as the lower edge of a socket opening-7b, and serves as a guide for the associated peg 3. When the cover is slid a suflicient distance toward the platen, slides 8 are pulled up by springs 9 and latch the cylindrical portions 3a in the socket openings so that such cylindrical portions serve as hinges when the front of the hood is lowered to enclose the typewriter mechanism. If the initial positioning of the pegs in elongated openings 2a of the brackets does not provide the desired alignment of the cover hood with the machine casing 6, the nuts 5 may be'loosened and the pegs readjusted on the brackets to obtain the correct alignment.

The cover hood may be tilted on the pegs 3 for access to the ribbon mechanism, and, to detach the cover hood,

the operator merely lifts the front of the hood toward the platen and with both thumbs exerts light pressure upon upper edges 8c of the spring-loaded slides 8. In this manner, pegs 3 are freed and the cover hood may be detached by a slight pull in the direction of the keyboard.

We claim:

1. In a typewriter, the combination with a casing housing automatic ribbon mechanism and the operative connections between the keys and the type bars, of a cover hood and means for detachably and pivotally supporting said cover hood upon said casing; said supporting means comprising pegs and means securing the same to and spaced below the top surface of said cover hood adjacent the rear at each side thereof, plates secured to the opposite sides of said casing and provided with horizontal forwardly opening sockets for receiving the respective pegs, vertically movable slides mounted on said plates and spring means urging said slides upwardly into position to block the openings of said sockets after insertion of said pegs therein.

2. In a typewriter, the invention as recited in claim 1, wherein said securing means comprises brackets fixed to said cover hood and having elongated slots through which the inner ends of said pegs extend, said pegs having enlargements between their inner and outer ends for centering said cover hood horizontally of said plates and said inner ends being threaded to receive nuts to secure the same to said brackets.

3. In a typewriter, the invention as recited in claim 1, wherein said slides have tongues of the width of and normally in alignment with the sockets of said plates to block the openings of said sockets, and means limiting the range of movement of said slides in opposition to said spring means to substantially the width of said sockets, whereby the upper edges of said tongues align with the lower edges of said sockets and constitute guides for introducing said pegs into said sockets upon depression of said slides.

References Cited in the file of this patent UNITED STATES PATENTS 2,022,702 Avery Dec. 3, 1935 FOREIGN PATENTS 230,921 Switzerland Apr. 17, 1944

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