Appeal No. 2003-0387 Page 7
Application No. 09/772,275
spaced at distance g, produce a restoring moment of gFc. This moment increases as
the angle Q increases, providing the wedges 52 remain secure in the bolster pockets
42. But certain movements of the wedges 52 within the bolster pockets 42 prevent the
warp moment gFc from becoming high enough to preclude truck hunting. These
movements may be designated: (1) Horizontal Rotation of the Wedges (Figure 7);
(2) Vertical Rotation of the Wedges (Figure 8); and (3) Unloading of the Wedges
(Figure 9).
The first undesirable moment is rotation of the wedge 52 in the bolster pocket 42
about a horizontal axis, see Figure 7. The wedge 52 rotates in the direction shown
and slips downwardly slightly in the bolster pocket 42. This permits the corner of the
wedge designated "x" to move deeper into the bolster pocket, as a consequence of
which the force Fc is reduced, which in turn reduces the warp moment, gFc, and lowers
the critical speed of truck hunting. The second undesirable movement is rotation of the
wedge 52 in the bolster pocket 42 about a vertical axis, see Figure 8. The wedge 52
rotates in the direction shown. This motion frees the static friction between the bolster
sloping surface 54 and the wedge 52, as a consequence of which the force Fc is
reduced, which also reduces the warp moment gFc. Finally, as shown in Figure 9,
under certain conditions the wedge 26 may move downwardly, in the direction of the
arrow, in the bolster pocket 38. Due to sloping surface 34 of the wedge 26, the wedge
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Next
Last modified: November 3, 2007