Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1995-02-23
1997-11-11
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
152503, 1525031, 403353, F16H 2140, B60S 124, F16B 700
Patent
active
056851952
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention crank mechanism and more particularly relates to crank mechanisms of windshield wiper drive linkages.
BACKGROUND OF THE INVENTION
Crank mechanisms are known wherein the lever and the tongue are interconnected through an articulated bolt separately produced and mounted which involves a relatively expensive and complex operation.
It is, therefore, an object of the invention to so improve the crank mechanism of the afore-mentioned type as to reduce the manufacturing costs, in particular, the costs of assembly.
According to the present invention two halves of a bayonet-type or twist-lock connection can be directly moulded to or formed on the tongue and the lever. They are connected in the relative position provided herefore to be subsequently placed in a position enabling assembly thereof on the driving arrangement and enclosing a different angle with respect to one another. This will be adequate to prevent an undesired unlocking of the bayonet-type connection from occurring. Because any desired relative position of the tongue and of the lever, during operation of the screen wiper arrangement, differs from the relative positions of these parts during establishing of the bayonet-type connection, this connection cannot unlock during operation of the screen wiper assembly. However, the afore-going conveys that this connection can be established with no need of using any tools or separate parts. This will reduce not only the number of parts but also the manufacturing costs and the time required for assembly. Compared with conventional designs, the parts number can be decreased from 9 to as low as 2.
According to a preferred form of embodiment the tongue and the lever, when in the coupled condition of assembly, are in approximately extended relationship with respect to one another, i.e. the knuckle joint during joining together of tongue and lever substantially are in the stretched position.
Preferrably the bayonet-type connection establishes a pivotal connection between lever and tongue, and corresponding steps will have to be taken to insure that the pivotal connection is prevented from axially unlocking. Such steps can be taken without incurring any special efforts in that the toggle moves within a chamber of the casing precluding any axial displacement of the entire knuckle joint or parts thereof in a direction transverse to the plane of movement.
Another embodiment of the invention is characterized in that the lever on the other end thereof is provided with a sleeve preferably including a blind bore for accommodating the inner end of the shaft. However, it is not imperative for the wiper shaft to be plugged or forced into the bore and blind bore, respectively, it can in stead also be injection-moulded.
Advantageously, a cambered supporting member inwardly supportable on a housing lid of the driving assembly is provided on the lever, arranged approximately opposite the sleeve. The supporting member prevents the movement of displacement of the lever in a direction transverse to the plane of movement thereof. In view of the cambered configuration, friction on the lid is minimized which especially applies if suitable pairs of substances are provided.
In another embodiment of the present the thickness of the tongue exceeds that of the lever at least in the area of connection. It goes without saying that the introduction slots referred to therein which are marginally open are arranged in congruent relationship. The advantage involved with this tongue configuration resides in that in no position of operation of the knuckle joint the tongue can separate from the lever, or vice-versa.
An enhanced simplification of the design, an additional decrease in costs and a further reduction of parts to 2 as mentioned before are attained through another embodiment of the invention in that a pivot pin for engagement with a bearing bore on the toothed gear, preferably worm gear wheel, is located on the end of the tongue facing away from the lever and protruding in the direction of the plane
REFERENCES:
patent: 1637125 (1927-07-01), Nelson
patent: 3262038 (1966-07-01), Smith
patent: 3462179 (1969-08-01), Hinkle
patent: 3485112 (1969-12-01), Goosmann
patent: 4263821 (1981-04-01), Savage et al.
International Search Report for Application No. PCT/EP93/01960 filed 23 Jul. 1993.
Herrmann Allan D.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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