Pipe joints or couplings – Contact only
Patent
1984-09-18
1986-03-11
Scanlan, Jr., Richard J.
Pipe joints or couplings
Contact only
285226, 285239, 285345, 285DIG22, F16L 5500
Patent
active
045751285
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for establishing a tight communication between an air intake mounted on a spring-balanced tilting truck cab and a connecting pipe securely mounted on the truck chassis, comprising a hose of elastic material, which at least over a portion of its length has a wall folded in the form of a bellows, the hose having one end designed to be secured to a first tubular element and the other end designed to be detachably coupled to a second tubular element.
A seal of this type can be designed for example to prevent dust, water, snow and the like from penetrating into the intake conduit from the engine air filter. It must permit a resilient movement of the cab relative to the chassis without any risk to the sealing function. Furthermore, it must be easily detachable and connectable when tilting the cab upward down. Ideally, it should be detachable without any particular manipulation when the cab is tilted and returned to its original sealing position automatically when the cab is tilted back to its operational position.
Sealing devices known up to now for the stated purpose fulfill the requirements to varying degrees. One device consists of a simple rubber bellows which merely abuts against a flange on the connecting pipe when the cab is tilted from the forward position back to the operational position.
This seal does not require any particular manipulation to be detached and reconnected, but on the other hand the risk of leakage is great, especially if there is a great bouncing movement of the cab relative to the chassis. It is also known to fix an equally simple rubber bellows to the connecting pipe on the chassis with the aid of a hose clamp. This does provide an effective seal in all positions, but it does require extra manipulation for detaching and reconnecting.
In a third device, a spring is used which presses the rubber bellows against the connecting pipe. It is true that this seal does not require any extra manipulation when the cab is tilted, but it is relatively expensive and complicated.
A fourth known device uses permanent magnets embedded in the bellows, which hold the bellows tightly to the connecting pipe. This solution is relatively expensive and requires that the connecting pipe be made of magnetic material.
The purpose of the present invention is to achieve a sealing device of the type described by way of introduction which is uncomplicated and inexpensive and provides a completely satisfactory seal even if there is significant movement of the cab as well as being automatically uncoupled and recoupled when the cab is tilted forward and back.
This is achieved according to the invention by a device which is characterized in that the second end of the hose is provided on its inside with at least one annular lip inclined towards the first end of the hose and that the second tubular element is provided on its outside with at least one annular bead, which, when the hose is mounted, is disposed axially inside the lip, the hose and the second tubular element having interacting parts, abutting against each other and causing a compression of the folded portion when the tubular elements are moved towards each other. By virtue of this design with an inclined lip, the lower portion of the hose can be pressed with very little force over the bead on the chassis connecting pipe. Due to the direction of incline of the lip and the friction between the lip and the connecting pipe, however, a much greater force is required to pull the lip over the bead in the opposite direction, which means that the hose will be held securely in place and provide a fully satisfactory seal even during large cab movement. When the cab is tilted, however, this force is not so great as to present any problem in pulling the hose off the connecting pipe. An advantage of the design according to the invention over the known design with embedded magnets is that a secure coupling is achieved regardless of the material in the connecting pipe. It need not consist of a ferromagnetic material, but can be mad
REFERENCES:
patent: 1925984 (1933-09-01), Novakovich
patent: 1984347 (1934-12-01), Sutton et al.
patent: 2047713 (1936-07-01), Simpson
patent: 2507536 (1950-05-01), Goodson
patent: 3388705 (1968-06-01), Grosshandler
patent: 3809412 (1974-05-01), Glover
patent: 3873137 (1975-03-01), Yamaguchi
patent: 4099744 (1978-07-01), Kutnyak et al.
patent: 4186949 (1980-02-01), Bartha et al.
AB Volvo
Scanlan, Jr. Richard J.
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