US 3744612 A
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Description (OCR text may contain errors)
United States Patent 1191 Gels 1 1 July 10, 1973 KEY LEVER MOUNTING ARRANGEMENT 1,641,543 9/1927  lnventor: Heinz Geis, Frankfurt/Main, Germany 2,713,386 7/1955  Assignee: Adlerwerke vorrn. Heinrich Kleyer M27920 3/1964 Aktiengesellschaft, Nuernberg,
Germany Primary Examiner-Edgar S. Burr 22 d; M 9, 1972 Attorney-Joseph R. Spalla and Keith [)1 Moore  App1.No.: 251,741
r  ABSTRACT  US. Cl 197/98, 197/106, 248/27,
248/205 R, 285/189, 285/194, 287/203, 398/15 A typewriter key lever bearing is rigidly secured to a  Int. Cl B41 5/08 n by forming tabs on the end of the hearing which  Search 7 0 are received in slots formed in the wall and pressed 287/203 56; 248/27 205 R; 285/189 thereagainst by the flexing of a resilient mounting plate 1793 194, 192; 308/15 in response to the tightening of a clamping device pressing both the mounting plate and the key lever  References Clted bearing against the wall.
UNITED STATES PATENTS I 847,835 3/1907 Secor 197/106 X j 2 Claims, 2 Drawing Figures l: 23 'T I 2/ l }/9 '35 I 1 l 3/+\\ 37 l I 29 l I k if 27 KEY LEVER MOUNTING ARRANGEMENT This invention relates to an arrangement for removably fastening a hollow key lever bearing to a wall of a business machine, and more particularly to an arrangement which rigidly secures the key lever bearing to a wall of a typewriter frame in such a manner as to prevent the fastening from being loosened by the stresses accompanying typing operations.
In a business machine, for example a typewriter, key lever bearings are used to support a portion of the mechanical linkages forming a type key action and undergo considerable stress during typing operations. In the past, key lever bearings have been fastened to supporting walls by means of anchor screws or screws and nuts. However, these fastening arrangements have proved disadvantageous, because they do not impart sufficient rigidity to the key lever bearing and the wall of the machine and because they tend to loosen up due to the stresses and vibrations accompanying the typing movements.
Accordingly, an object of the present invention is to provide an arrangement for rigidly securing a hollow key lever bearing to a wall of a business machine in I such a manner as to prevent loosening due to the stresses and vibrations accompanying typing movements.
Another object of the invention is toprovide an arrangement which simplifies the fastening of a hollow key lever bearing, in a rigid manner, to a wall of a business machine.
Still other objects, features andadvantages of the present invention will become apparent to those skilled in the art from a reading of the following detailed description of the invention, taken in conjunction with the accompanying drawing, wherein:
FIG. 1 is a vertical sectional view of a key lever bearing fastened to a wall in accordance with the present invention; and
FIG. 2 is a topview of the key lever bearing shown in FIG. 1.
Referring now in detail to the figures in the drawing, there is shown, diagrammatically, an elongated key lever bearing, generally indicated 11, for supporting.
portions of a typewriter key lever mechanism (not shown). As shown, the key lever bearing 11 is hollow and formed by a wall member 13 having a rectangular cross-sectional configuration with an edge portion 15 for abutting a wall 17 of a typewriter frame. The key lever bearing 11 may be secured to the wall 17 of the typewriter by a suitable clamping means which may desirably be in the form of a threaded screw, generally indicated 19, which is received through an opening 20 formed in the wall 17 with a head portion 21 of the screw 19 exerting a force against the wall 17 and with a threaded portion 23 of the screw 19 being threadably received in a threaded portion, generally indicated 25, of the key lever bearing 11. As shown, the threaded portion 25 is in the form of a threaded nut which is secured by suitable means (not shown), to the wall member 13 forming the key lever bearing 11. The portions of the typewriter key lever mechanism supported by the key lever bearing 11 as well as the means for securing the threaded portion 25 to the wall member 13 of the key lever bearing 11 have been omitted from the description since they form no part of the present invention and may be conventional.
To provide means for firmly securing the key lever bearing 11 to the wall 17, the key lever bearing 11 is provided with tabs 27 extending from the edge portion 15, and wall 17 is provided with spaced-apart slots, generally indicated at 29 and having inside and outside edges 31, 33 respectively, for receiving the tabs 27. To firmly secure the key lever bearing 11 to the wall 17 of the typewriter frame so as to prevent loosening of the connection as a result of alternating stresses and other vibrations accompanying typing operations, a resilient mounting plate, generally indicated 35, is located on the opposite side of the wall 17 with resilient arm portions 37 pressing the tabs 27 against the wall 17. As shown, the mounting plate 35 has an opening 39 through which the threaded screw 19 is received, and the resilient arm portions 37 are flexed and bent against the inside edges 31 of the slots 29 so as to press the tabs 27 against the outside edges 33 of the slots 29 as the mounting plate 35 is pressed against the wall 17 by the head portion 21 of the screw 19.
From the foregoing, it will be apparent that a key lever bearing 11 may be easily and simply secured to the wall 17 of a typewriter in accordance withthe above-described mounting arrangement. The end of the keylever bearing 11 is placed against one side of the wall 17 with the tabs 27 inserted through the slots 29 and the edge portion 15 abutting the wall 17. Next, the mounting plate 35 is placed on the opposite side of the wall 17 with the resilient arm portions 37 engaging the inside edges 31 of theslots 29. Finally, the threaded screw 19 is inserted through the hole 39 in the mounting plate 35 and the hole 20 in the wall 17 and then threaded into the threaded portion 25 of the key lever bearing 11. The tightening of the screw 19 clamps the key lever bearing 11 and the mounting plate 35 against thewall 17 and causes the resilient arms 37 to bend against the inside edges 31 of the slots 29 and press the tabs 27 against the outside edges 33 of the slots 29, thereby rigidly securing the key lever bearing 11 to the wall 17 of the typewriter frame.
While only a single embodiment of the present invention has been illustrated and described, it will be apparcut to those skilled in the art that various modifications and improvements may be made without departing from the scope and spirit of the invention. Accordingly, it is to be understood that the invention is not to be limited by the illustrative embodiment, but only by the scope of the depending claims.
What is claimed is:
1. ln abusiness machine, the combination comprising:
an elongated key lever bearing for supporting movable key lever mechanism,
wall means for supporting said key lever bearing in said business machine,
said key lever bearing having an edge portion for abutting said wall means and tabs formed thereon extending beyond the edge portion,
said wall means defining spaced-apart slots with inside and outside edges for receiving the tabs formed on said key lever bearing,
resilient means for engaging the tabs received in the slots defined by said wall means,
clamping means for clamping said key lever bearing 7 to said wall means, and
said resilient means being flexed in response to the clamping movement of said clamping means for resiliently pressing the tabs of said key lever bearing and a threaded screw having a head for engaging against the outside edges of the slots defined by the plate portion of said resilient means, and
said wall means so as to rigidly secure said key said threaded screw being threadably received in the lever bearing to said wall means. threaded portion of said key lever bearing for 2. in a business machine according to claim 1: 5 drawing the edge of said key lever bearing against said resilient means being in the form of a plate porsaid wall means and drawing the plate portion of tion having resilient arms with intermediate porsaid resilient means towards said wall means so as tions thereof being supported against the inside to flex the resilient arms against the inside edges of edges of the slots defined by said wall means, the slots and press the tabs against the outside said clamping means being in the form of a threaded edges of the slots.
portion rigidly secured to said key lever bearing