Machine element or mechanism – Control lever and linkage systems – Foot operated
Reexamination Certificate
2000-02-28
2001-11-06
Bucci, David A. (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Foot operated
C267S275000, C192S08100C
Reexamination Certificate
active
06311578
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a pedal having a pedal arm which is mounted pivotably in a retaining part, can be deflected, by means of a pedal plate, by the force of a foot, and can be pivoted back into an initial position by at least one restoring spring, having a desired-value generator for producing an electrical signal as a function of the position of the pedal arm, and having a frictional damper for damping the movement of the pedal arm.
Pedals of this type are used, for example, as a gas pedal in a motor vehicle having an electronic load control system and are therefore known. The frictional damper generally has a friction pad which is prestressed against a friction surface by means of a spring. When the pedal arm moves, the friction pads slides over the friction surface and therefore prevents the movement of the pedal arm, in particular when the latter is released, from being instantaneously transmitted to the desired-value generator. In this connection, the friction produced in the frictional damper in the actuating direction of the pedal arm is generally greater than in the opposite direction. The frictional damper produces a force hysteresis which damps the deflection of the pedal arm and therefore prevents the foot which is actuating the pedal from swinging freely. When the pedal is installed, the friction pad can be prestressed in accordance with and aligned in accordance with against the friction surface the intended friction. As a result, the pedal consists of a very large number of components which are complicated to manufacture and install.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a pedal of the type mentioned at the beginning in such a manner that it has as few components as possible and can be installed in a particularly simple manner.
According to the invention, this problem is solved by the frictional damper having a slotted sleeve with two end regions which overlap and are prestressed against each other, and an actuating element for producing a relative movement of the end regions when the pedal arm moves.
This design means that in order to produce the envisaged damping the pedal according to the invention requires only the sleeve as a single component for the friction pad and the friction surface. The pedal according to the invention therefore consists of particularly few components. The required damping of the frictional damper can be defined by the prestressing of the end regions and the choice of material for the sleeve and therefore no longer has to be set when the pedal is being installed. As a result, the pedal is particularly simple to install.
The actuating element could be designed, for example, as a strap which is wound around the sleeve and could prestress the sleeve as the pedal arm is being pressed down. The end regions of the sleeve thereby slide over each over and thus produce the intended friction. However, the pedal according to the invention has particularly small dimensions if the restoring spring is designed as a leg spring, and the sleeve bears with its outer circumference against the inside of the restoring spring. Since, as the pedal arm is being pressed down, the restoring spring, which is designed as a leg spring, reduces its diameter and therefore prestresses the sleeve, this design means that the frictional damper does not require an actuating element to be installed separately.
A relative movement between the sleeve and the restoring spring could result in damage to the sleeve and the restoring spring. According to another advantageous development of the invention, a relative movement of this type can-be avoided in a simple manner if an end region of the sleeve is fastened on the retaining part.
According to another advantageous development of the invention, the sleeve can be prevented from remaining in a compressed state if the outside end region of the sleeve is fastened on the restoring spring.
According to another advantageous development of the invention, the sleeve can be manufactured from any desired material, irrespective of the required frictional force, if the sleeve has a friction lining on its end regions. It is thereby possible for the sleeve to be manufactured, for example, from an elastic synthetic material or from spring steel, in accordance with the intended prestressing force of its end regions. A suitable synthetic material is, in particular, polyacetal.
According to another advantageous development of the invention, the sleeve can be manufactured with the friction lining in a particularly cost-efficient manner if the sleeve has a coating as the friction lining.
According to another advantageous development of the invention, a coefficient of friction, which is required for the intended friction, at the end regions of the sleeve can be produced in a simple manner if the sleeve or the friction lining has fillers.
According to another advantageous development of the invention, the friction is virtually constant over the entire travel of the pedal arm if the fillers of the friction lining comprise Teflon.
According to another advantageous development of the invention, the friction lining is connected reliably to the sleeve if the friction lining is sintered onto the sleeve. A further advantage of this design resides in the fact that virtually any desired coefficients of friction can be produced by the sintering on of an extremely wide range of materials.
REFERENCES:
patent: 2541947 (1951-02-01), Starkey
patent: 2939561 (1960-06-01), Rudisch
patent: 3149706 (1964-09-01), Mason et al.
patent: 3500701 (1970-03-01), Gussenbauer et al.
patent: 3550736 (1970-12-01), Lang
patent: 3709339 (1973-01-01), Austin et al.
patent: 3731773 (1973-05-01), Austin et al.
patent: 3750784 (1973-08-01), Shum, Jr.
patent: 3750785 (1973-08-01), Smith et al.
patent: 4018104 (1977-04-01), Bland et al.
patent: 4576762 (1986-03-01), Griffin et al.
patent: 4869220 (1989-09-01), Imoehl
patent: 4869357 (1989-09-01), Batchelder
patent: 4944269 (1990-07-01), Imoehl
patent: 4958607 (1990-09-01), Lundberg
patent: 5078371 (1992-01-01), Joseph et al.
patent: 5233882 (1993-08-01), Byram et al.
patent: 5295409 (1994-03-01), Byram et al.
patent: 5385068 (1995-01-01), White et al.
patent: 5408899 (1995-04-01), Steward
patent: 5416295 (1995-05-01), White et al.
patent: 5438516 (1995-08-01), Neubauer et al.
patent: 5697260 (1997-12-01), Rixon et al.
patent: 5768946 (1998-06-01), Fromer et al.
patent: 5812050 (1998-09-01), Figgins
patent: 5868040 (1999-02-01), Papenhagen et al.
patent: 19517172 (1996-11-01), None
patent: 19536699 (1997-04-01), None
patent: 8907706 (1989-08-01), None
Bucci David A.
Farber Martin A.
Kim Chong H.
Mannesmann VDO AG
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