Fluid-pressure and analogous brake systems – Locks
Patent
1984-10-16
1986-11-11
Reger, Duane A.
Fluid-pressure and analogous brake systems
Locks
180287, B60T 1700
Patent
active
046218742
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/SE84/00054 filed Feb. 14, 1984.
Theft-preventing devices acting on brake systems are known previously. As examples can be mentioned devices disclosed in OS Nos. 22 46 045, 27 55 178, 28 45 011 and 29 03 272.
The present invention has the object to improve known anti-theft devices of the kind referred to above, so that the safety against opening the locking device by force is twice as high.
The characterizing features of the invention are defined in the attached claims.
A further object of the invention, in addition to the aforesaid advantage, is to render it possible to safely utilize a code lock in such a manner, that persons having knowledge of the code can feed in the correct code and thereby release the brakes so that the vehicle can be moved.
The invention is described in the following, with reference to the accompanying drawings, in which FIG. 1 shows schematically an embodiment of the invention in one application, FIG. 2 shows a second embodiment of a detail comprised in the invention, FIGS. 3-5 show schematically the invention in a second application and in three different functional phases.
In FIG. 1 a compressed-air operated brake system for a traction vehicle, for example a lorry, is shown schematically. The front wheels of the vehicle are designated by 1, and the rear wheels by 2. These wheels comprise conventional brakes operated by compressed air. The compressed air system consists of a compressor 3, which delivers compressed air to two compressed-air tanks 4 and 5. The tanks can be divided into two parts. The decelerating brake comprises a foot-operated valve 6, which receives compressed air from the tanks 4 and 5. The feed line is designated by 7. A second feed line is designated by 8. Through a line 9 extending from the valve 6 compressed air is transported all the way to the brakes of the front wheels 1. A similar line 10 extends to the brakes of the rear wheels 2. The decelerating brake system is of conventional design and includes additional lines and details, which are not described here because they are no part of the present invention.
The vehicle also has a second brake system, i.e. the parking brake system. This system receives compressed air from the tanks 4 and 5 through a feed line 11. From the line 11 the compressed air is passed to a control valve 12, from which compressed air is fed through the line 13 to the rear wheels 2. The parking brake system operates as follows. When the line 13 is pressureless, the brake blocks are applied by springs in the wheels 2. For releasing the parking brake, the valve 12 is adjusted so that compressed air is passed through the line 13 and thereby the brake blocks are released from the brake drums in the rear wheels 2 against the action of the springs (not shown). The parking brake, thus, is actuated as soon as the valve 12 is adjusted or the pressure in the compressed air system ceases. The parking brake system, like the aforementioned decelerating brake system, also includes details and lines, which are not described here as not being part of the present invention.
The locking device comprises a three-way valve 14 inserted in the line 11 and operated by a code lock 15. The code lock can be mechanical or electronic and determines the position for the valve body in the three-way valve 14. The three-way valve has an outlet opening 16 communicating with the valve 12, and a second outlet opening 17 communicating with the brake circuit for the front wheel brakes via the line 18. A check valve 19 in the line 18 ensures that compressed air can be passed to the brake system of the front wheels 1, but that the line is blocked in the opposite direction. This function is carried out by the valve body 20. In the line 9 extending from the decelerating brake valve 6 to the brake system of the front wheels a second check valve 21 is provided, which comprises a valve body 22 acting in such a manner, that pressure can be fed from the line
REFERENCES:
patent: 3879091 (1975-04-01), Bridwell et al.
patent: 3973805 (1976-08-01), Stevenson et al.
patent: 4258819 (1981-03-01), Baptiste
patent: 4300057 (1981-11-01), Batle Crosas
patent: 4519653 (1985-05-01), Smith
LandOfFree
Vehicle theft-preventing device acting on the brake system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vehicle theft-preventing device acting on the brake system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vehicle theft-preventing device acting on the brake system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-373607