Patent GB-190716263-A (GB)
Title: Improvements in Deadeners or Subduers of Shocks and Oscillations for use in the Suspension of Vehicles.
Inventor: LAET JEAN PAUL DE
Filed: 1907-07-15
Granted: 1908-05-07
Abstract: 16,263. Laet, J. P. de. July 15. Springs and means for absorbing mechanical shocks. - In a dash - pot which is adapted for use with vehicle bearing-springs and comprises an oscillating piston mounted in a cylindrical casing, means are provided whereby the openings for the passage of the fluid through the piston become more and more obstructed as the piston moves in either direction from its normal position of equilibrium. In the arrangement shown in Figs. 1 and 2, a piston 9 is formed with a cylindrical extension 10 which is mounted on a squared part of a spindle 6 carried by a casing consisting of two parts 1, 2 bolted together and to the vehicle. Openings 14 provided in the piston are arranged, to be obstructed by tapering crescent pieces 12 attached to a partition block 11 secured in the casing. The openings 14 may be regulated by a screw or by adjusted blocks 19 held in place by friction. The crescent pieces 12 may be replaced by a complete circular piece, and may be of the same or of different thicknesses at opposite sides of the block 11. The cylindrical portions 10 of the piston has bearings 13 mounted in the casing 1, 2, and the spindle 6 has a head 7 at one end and washers 16 at the other end for ensuring tightness. The piston is fitted within the casing so as to offer only extremely restricted passage to the fluid anywhere else than through the openings 14, and the casing is provided with a screw plug 15 for filling it with oil, grease, or other material. A crank 8, mounted upon another squared part of the spindle 6, is connected by a universal joint to a rod which is attached to the axle. In the form shown in Fig. 6, the crescent pieces are replaced by tapering circular ribs 20, 21, 22 which enter openings provided in the piston, and the spindle 26 may rest in a corresponding bearing in the casing 2. Figs. 7 and 9 show another arrangement in which a piston 35 is secured by a pin 33 to a spindle 31 mounted in a casing adapted to be secured by lugs 28, 29 and provided with a cover-plate 40 secured by a ring 51 and formed with annular inclines 43, 44 which enter openings 36 formed in the piston. The inclines 43, 44 are not of the same slope throughout, the portions which first come into action to obstruct the openings 36 being of less inclination than the remainder. Also, one of these inclines is made longer than the other, so that the resistance offered to the passage of fluid begins earlier during the recoil of the bearing-spring 63 than during its flattening. A crank 56 is secured to the conical portion 54 of the spindle 31 and is pivoted at 57 to a rod 59, which is adjustable by a screw and is connected by a ball joiut 61 at its lower end to a stirrup 62 on the spring 63. In a further modification, the piston is mounted eccentrically within the casing, the passage for the liquid being provided between the periphery of the piston and the inside of the casing. The circumference of the piston is tapered off slightly at its ends, the inner wall of the casing being similarly out of truth at the parts near the partition block.