Expansible chamber devices – Cylinder detail – With reinforcing member
Reexamination Certificate
1999-11-29
2001-10-02
Look, Edward K. (Department: 3745)
Expansible chamber devices
Cylinder detail
With reinforcing member
C060S582000
Reexamination Certificate
active
06295919
ABSTRACT:
The present invention relates to a braking device for a vehicle, comprising a pneumatic booster, a master cylinder and a securing nut, the booster comprising in particular a rigid casing, a moving partition and a through-bolt, the casing comprising a front shell and a rear shell forming respective walls for a front chamber and a rear chamber which are defined inside the casing and separated from one another by the moving partition, the through-bolt passing through the front shell and rear shell in an axial direction in order to join these together, and having a threaded front end outside the front chamber and a shoulder on which the front shell rests inside the front chamber, the master cylinder comprising a flange pierced with a hole through which the front end of the through-bolt passes.
BACKGROUND OF THE INVENTION
Boosters of this type are known in the prior art, and an example of one is given in patent document DE-2,830,262.
The presented invention rests on the discovery that boosters with through-bolts, although displaying the advantage of exhibiting a very satisfactory overall rigidity for a relatively small casing thickness, also have the drawback of being able to transmit very high forces towards the driver in the event of an accidental frontal impact on the vehicle.
SUMMARY OF THE INVENTION
The object of the invention consists precisely in avoiding the transmitting to the driver of the forces of the impact received by a braking device employing a booster with through-bolts.
To this end, the device of the invention, which in other respects is in accordance with the above preamble, is essentially characterized in that the securing nut has a barrel engaged in the hole in the flange and screwed onto the front end of the through-bolt, and a collar pressing the flange against the front shell, in that the barrel of the nut and the shoulder of the through-bolt have first and second respective sections facing one another, and in that the first section completely covers the second section.
By virtue of this arrangement, a frontal impact received by the master cylinder is absorbed by crumpling of the front shell, instead of being transmitted to the bulkhead by the through-bolt, as was the case in the prior art.
The through-bolt may also be of tubular shape, it being possible for the front shell itself to be crimped to the shoulder of this through-bolt.
Other features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication, with reference to the appended drawings.
REFERENCES:
patent: 5410880 (1995-05-01), Schluter
Comstock Warren
Laz Thomas E.
Look Edward K.
McCormick Jr. Leo H.
Robert & Bosch GmbH
LandOfFree
Reinforced impact-embrittled braking device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reinforced impact-embrittled braking device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reinforced impact-embrittled braking device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2616198