Motor vehicles – Special wheel base – Collapsible or knockdown for storage or transport
Reexamination Certificate
1999-06-09
2001-01-09
Johnson, Brian L. (Department: 3618)
Motor vehicles
Special wheel base
Collapsible or knockdown for storage or transport
C180S210000, C180S065100
Reexamination Certificate
active
06170592
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a security framework for an electric cart, and more particularly to a detachable framework for an electric cart that includes a front and a rear part that can be secured together to form a complete piece or disassembled into two pieces for convenient transport of the electric cart.
In modern developed areas, automobiles have been widely used as a convenient transportation means. Due to the fact that the automobile consumes fuel and generates toxicant exhausts, the fuel engine automobiles have been partly replaced by electrically driven vehicles to reduce the air pollution. There is a common type of electrical vehicle developed mainly for housewives, the old and/or the disabled to help them move in short to mid distance and such an electric vehicle basically has a light weight and simple structure for easy manipulation.
Since such an electric vehicle is designed for short to mid distance, it is preferable that the electric vehicle can be easily carried to different locations when desired. For this purpose, it is preferable the vehicle is comprised of detachable parts so as to facilitate disassembly thereof. Electric carts having a two-piece chassis structure are available in the market. Such two-piece chassis usually includes a front and a rear chassis member that are, however, usually connected to each other simply by means of “insertion” of a portion of one chassis member into corresponding bore on the other chassis member. This causes a misalignment or relative shifting problem when the two chassis members have been repeatedly disassembled and assembled for many times. It is possible one of the two chassis members would turn about a major axis of the chassis relative to another chassis member and the whole electric cart can not operate in a stable manner.
Moreover, there are not connecting means provided to enhance the connection of the front chassis member to the rear chassis member, particularly at the transverse beams between the front and the rear chassis members, to keep, for example, a seat connected to a top of the front or the rear chassis member in a fixed state without becoming loosely movable when the electric cart is moving. A two-piece chassis having relatively turnable chassis members and looselymovable seat will, of course, adversely affect the use of the electric cart in an absolutely safe manner and the safety of an operator thereof.
In an earlier invention of the same inventor that has been filed a U.S. patent application under Ser. No. 08/947,395 and entitled “ELECTRIC CART WITH TWO PIECE CHASSIS”, an improved two-piece chassis for an electric cart is disclosed. The present invention is made to provide a further improvement over the U.S. patent application Ser. No. 08/947,395, so that a detachable framework for an electric cart can be more conveniently and more securely assembled to ensure safe operation of the electric cart.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a detachable framework for an electric cart in which means are provided to push transverse beams of front and rear chassis parts of the framework against one another for them to always firmly and accurately connect together even the chassis parts have been repeatedly detached and assembled many times.
Another object of the present invention is to provide a detachable framework for an electric cart in which a seat is associated with the chassis parts in such a manner that when an operator sits on the seat, a torque is produced to cause the front and the rear chassis parts of the framework to more securely connect to one another.
To achieve the above and other objects, the detachable framework for an electric cart according to the present invention mainly includes a first chassis part, a second chassis part, and a connecting pin. The first chassis part has a steering handle for controlling a moving direction of a front wheel of the electric cart, a connecting pin receiver upward extended from a rear center thereof, and a connecting beam extended across a lower rear end thereof. The second chassis part has rear wheels and a driving mechanism mounted thereto and includes two receiving heads at its two lower front ends for receiving two ends of the connecting beam therein, a supporting post upward extended from a middle front thereof and having a first positioning screw on its front wall, and a seat post connected to a front top of the supporting post to locate immediately above the connecting pin receiver and having a second positioning screw provided on a front wall thereof. The connecting pin has a long lower portion vertically inserted into the seat post and the connecting pin receiver and a short upper portion for a seat connected thereto. When the first and the second positioning screws are turned to tightly press against a rear wall of the connecting pin receiver and a front wall of the connecting pin in the seat post, respectively, the connected first and second chassis parts can be further firmly associated with one another even if they have been repeatedly disassembled and assembled many times. And the seat may be always firmly and stably connected to the connecting pin without the risk of shifting forward or rearward to adversely affect a safe manipulation of the electric cart.
REFERENCES:
patent: 4861058 (1989-08-01), Cresswell
patent: 4892166 (1990-01-01), Gaffney
patent: 4909525 (1990-03-01), Flowers
patent: 5074372 (1991-12-01), Schepis
patent: 5154251 (1992-10-01), Fought
patent: 5941327 (1999-08-01), Wu
patent: 2133358A (1992-12-01), None
Johnson Brian L.
Klebe G B
Pro-Techtor Inter-national Services
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