Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1998-07-20
2000-07-04
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
527569, G05G 9047, G05G 503
Patent
active
060822120
ABSTRACT:
A handle mounted generally horizontally on a fork lift truck for controlling forward and reverse speed of movement of the truck and raising and lowering forks is carried by a control device. The control device includes a shaft with a centrally positioned spherical section contained in a socket in a support member. The shaft is therefore free to rotate about the center of the sphere. A ramp cam is mounted on the support member surrounding the shaft. A slider mounted on the shaft is pressed against the cam by action of a spring. This arrangement assures that the shaft and control handle remain centered until acted upon by an operator of the truck. Two linear potentiometers provide electrical output signals representing the X (horizontal) and Y (vertical) positions of the end of the shaft opposite the control handle. The cam is provided with four distinct compound surfaces. For vertical movement of the handle, the slopes of the two lower surfaces are greater than the slopes of the two upper surfaces. The slopes of each surface are also different in the forward and reverse direction. This arrangement provides the illusion that the same force is required to move the handle in any direction. A detent in the center of the cam requires a slightly greater force to move the handle from the center position.
REFERENCES:
patent: 4306208 (1981-12-01), Coors
patent: 4352050 (1982-09-01), Sakano
patent: 4353177 (1982-10-01), Hoekstra
patent: 4375631 (1983-03-01), Goldberg
patent: 4489304 (1984-12-01), Hayes
patent: 4490710 (1984-12-01), Kopsho, Jr. et al.
patent: 4520242 (1985-05-01), Kopsho, Jr.
patent: 4533899 (1985-08-01), Isaksson
patent: 4587510 (1986-05-01), Kim
patent: 4620176 (1986-10-01), Hayes
patent: 4646087 (1987-02-01), Schumann
patent: 4646582 (1987-03-01), Kijima
patent: 4733214 (1988-03-01), Andresen
patent: 4784008 (1988-11-01), Paquereau et al.
patent: 4795952 (1989-01-01), Brandstetter
patent: 4849583 (1989-07-01), Meyer
patent: 4912997 (1990-04-01), Malcolm et al.
patent: 5176041 (1993-01-01), Meier et al.
patent: 5257992 (1993-11-01), Estrada et al.
Bergman Brent A.
Trego Allen T.
Crown Equipment Corporation
Herrmann Allan D.
LandOfFree
Multi-function control handle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-function control handle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-function control handle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1475885