Machine element or mechanism – Gearing – Interchangeably locked
Reexamination Certificate
1999-09-03
2001-08-07
Estremsky, Sherry (Department: 3681)
Machine element or mechanism
Gearing
Interchangeably locked
C070S245000, C074S336001
Reexamination Certificate
active
06269708
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to gearboxes and, more particularly, to a device for a multi-stage gearbox including at least one shifter rod which is engageable by at least one locking element for locking it in position when it is in a predetermined position, and to a method of operating same.
A device for a multi-stage gearbox of this type is known from DE 22 23 553 A1. Therein, an immobilizing element for arresting the shifter rod in a predetermined position is provided in addition to a locking element. This arrangement requires a greater amount of space because the immobilizing element is effective on the shifter rod at right angles to the locking element. Moreover, the shifter rod has to be constructed so that the arresting force imposed by the immobilizing element can be properly applied. This arrangement is relatively expensive, especially when there are more than two shifter rods.
A gear blocking arrangement for a gearbox is known from DE 196 47 788 A1 in which a shifter rod is surrounded by a latching-sleeve having depressions spaced around its periphery. These depressions serve firstly for accommodating a locking element and secondly, for accommodating an immobilizing element. A disadvantage of this gear blocking arrangement is that it requires a relatively large amount of space due to the provision of the latching element on the one hand, and due to the immobilizing element being displaced by an angle of 180° around the periphery of the latching element on the other.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a device for a multi-stage gearbox and a method of operating which overcome one or more of the deficiencies discussed above.
Another object is to develop a multi-stage gearbox in which the shifter rod can be locked in different positions using differing locking forces in a simple and space-saving manner.
In accordance with the present invention there is provided a device for a multi-stage gearbox comprising a shifter rod; a locking element for engaging and locking said shifter rod in a predetermined position; a setting element coupled to the locking element and moveable between at least two different positions relative to the locking element; and a control device for setting the setting element in either of the two different positions relative to the locking element.
In accordance with another aspect there is provided a method of controlling an agricultural machine gearbox including a shifter rod, a locking element for engaging and locking said shifter rod in a predetermined position; a setting element coupled to the locking element and moveable between a retention position and a shift position; and a control device for setting the setting element in either of the two positions, including the step of: moving the setting element from said retention position into said shift position by actuating a push-button.
REFERENCES:
patent: 4856628 (1989-08-01), Momiyama
patent: 5161422 (1992-11-01), Suman et al.
patent: 5845224 (1998-12-01), McKee
patent: 5916326 (1999-06-01), Tischer
patent: 22 23 553 A1 (1972-12-01), None
patent: 4-312997 (1993-04-01), None
patent: 43 12 997 A1 (1994-10-01), None
patent: 196 47 788 A1 (1998-04-01), None
patent: 197 35 844 A1 (1999-02-01), None
patent: 0 073 280 A1 (1983-03-01), None
patent: 695861 (1979-11-01), None
patent: 1-795438 (1990-02-01), None
Engenhorst Werner
Gersmann Manfred
Strieker Norbert
Class Industrietechnik GmbH
Estremsky Sherry
Husch & Eppenberger LLC
Lewis Tisha D.
Muir Robert E.
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