Vehicle fenders – Buffer or bumper type – Bumper having impact force absorbing means directly...
Patent
1998-09-03
1999-08-24
Pape, Joseph D.
Vehicle fenders
Buffer or bumper type
Bumper having impact force absorbing means directly...
293134, 293135, 293136, 293137, 267139, 267 33, B60R 1926
Patent
active
059415827
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a vehicle bumper and in particular relates to a vehicle bumper incorporating hydraulic means. The invention also relates to a vehicle bumper incorporating hydraulic means and air cushion means.
The use of bumpers at the front and back of motor vehicles to prevent serious damage to the vehicle is well known. Most bumpers include a horizontal bar fixed across the front or back of the vehicle to reduce damage in a collision. These bars are fixed onto the vehicle framework or chassis. The horizontal bar consists of a metal bar with or without plastics material secured to it. Usually a trimming of rubber is secured to the outer side of the bars. In recent times the bar is enclosed in solid polyurethane foam or other similar rigid shock absorbent plastics material. Decorative surface coatings may optionally be provided.
In the prior art, the structure of the bumpers are not designed or constructed to withstand heavy impact on collision. Usually in such situations, serious damage is caused to the vehicles and misalignment of the base framework of the vehicle occurs.
Thus it is an object of the present invention to provide a bumper for a motor vehicle which is configured to and constructed to withstand substantial impact force exerted on the vehicle either at the front or back of the vehicle or from both directions.
The invention discloses a bumper device for a motor vehicle to reduce the damage of the force of impact on collision with a foreign body comprising of an impact receiving means, at least one hydraulic piston and cylinder means to receive the force of impact; at least one biasing means to receive the impact force from the hydraulic piston and cylinder means, said biasing means secured to the vehicle chassis frame body. The force of impact of collision with a foreign body is received by the impact receiving means and transmitted onto the hydraulic piston and cylinder means and the resultant impact force is transmitted onto the biasing means and on to the chassis frame body. The impact receiving means comprises of an anchorage frame with a channel and a tubular pneumatic balloon.
The hydraulic piston and cylinder means comprises of a first cylinder portion, a second fructo conical cylinder portion: and a third cylindrical portion, all three portion being connected linearly. The cross-sectional diameter of the first portion being substantially larger than the cross-sectional diameter of the third portion, and a first piston head and shaft engaged in the first cylinder portion and a second piston and rod in the third cylinder portion.
The hydraulic cylinder contains a pre-determined ratio of hydraulic liquid and air or other gaseous material.
The bumper means as described above consists of single stage hydraulic cylinder and piston means. In another aspect, the invention also includes a bumper device where a plurality of hydraulic cylinder and piston means are provided. These hydraulic cylinder and piston means can be arranged in series or in parallel or a combination thereof, i.e., the reduction of the impact force by the hydraulic cylinder and piston means is done by stages, if arranged in series, or simultaneously if arranged in parallel.
FIG. 1 shows a cross-sectional view of the bumper assembly in isolation;
FIG. 2 shows a cross-sectional view of another embodiment of a bumper assembly.
Referring to FIG. 1 there is shown a bumper unit (10) which includes a hydraulic cylinder (12) comprising of three portions. The first portion (14) is an elongated tubular cylinder and the third portion (18) is an elongated tubular cylinder whose cross-sectional diameter is smaller than the cross-sectional diameter of the first cylinder portion (14). The first and the second cylinder portions are sealingly connected by a fructo conical second portion (16). The first cylinder portion (14) includes a hydraulic piston (20) with the rod (22) extending beyond the piston head (24). A hydraulic seal (26) is engaged upon the piston head (24) to ensure a effective hydraulic seal when the piston i
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Pape Joseph D.
Patel Kiran
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