Roller skate

In a steerable roller skate a one-piece sole plate has a bottom wall, with a pair of support shaft bosses in the bottom wall, each with an open-ended vertical passage. An elongated steel shape having internally threaded bolt-receiving spuds spaced along its length complementarily to the bosses is positioned to be coaxial with the boss openings. Shaft bolts, for mounting wheel trucks, extend through the boss passages and into threaded engagement with the spuds. The underside of the sole plate has a pair of bearing tongue seats formed in it. Neither the shaft bosses nor the seats have a reentrant surface with respect to the adjacent surfaces of the underside of the sole plate.

BACKGROUND OF THE INVENTION 
In sole plates known heretofore that involve the use of wheel trucks 
mounted on a shaft and supported for tilting movement by a strut or tongue 
projecting into a socket made integral with the sole plate, the shaft has 
been threaded into a boss, and both the boss and the socket have been 
formed at an angle to the sole plate. This is illustrated in U.S. Pat. No. 
4,058,323, and in a somewhat different form, in U.S. Pat. No. 4,159,830. 
One of the objects of this invention is to provide a sole plate adapted to 
use with a wheel truck mounted on a shaft and supported for tilting 
movement by a tongue projecting into a socket made integral with the sole 
plate, that can be produced in a simple two-piece mold. 
Another object is to provide such a sole plate that can be made 
economically of plastic but which is strong. 
Other objects will become apparent to those skilled in the art in the light 
of the following description and accompanying drawing. 
SUMMARY OF THE INVENTION 
In a steerable roller skate a one-piece sole plate has a bottom wall, with 
a pair of support shaft bosses in the bottom wall, each with an open-ended 
vertical passage. An elongated steel shape having internally threaded 
bolt-receiving spuds spaced along its length complementarily to the bosses 
is positioned to be coaxial with the boss openings. Shaft bolts, for 
mounting wheel trucks, extend through the boss passage and into threaded 
engagement with the spuds. The underside of the sole plate has a pair of 
bearing tongue seats formed in it. Neither the shaft bosses nor the seats 
have a reentrant surface with respect to the adjacent surfaces of the 
underside of the sole plate.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now to the drawing for an illustrative embodiment of this 
invention, reference numeral 1 indicates a steerable roller skate which in 
this embodiment is of the type to which a shoe 2 is attached. The skate 1 
includes an elongated sole plate 5 in the form of an open-topped dish with 
a bottom wall 7, a continuous side wall 15, and a shoe engaging rim 35. 
The bottom wall 7 includes a central section 9, a toe section 11 and a heel 
section 13 (see FIGS. 4 and 10). 
The side wall 15 includes a toe part 16 and an upwardly rearwardly rising 
part 17. 
As shown particularly in FIG. 10, between the central section 9 and the toe 
section 11 of the bottom wall, and integral with the bottom wall, is a toe 
end support shaft boss 18 with a vertical, cylindrical bore 19. Between 
the central section 9 and the heel section 13, and integral with the 
bottom wall, is a heel end support shaft boss 20 with a vertical, 
cylindrical bore 21. Both bosses 18 and 20 project beyond the upper and 
lower surfaces of the bottom wall 7. In this embodiment, the upper ends of 
the bosses are generally cylindrical. The depending, lower ends of the 
bosses are in the form of truncated, inverted cones. 
Also integral with the bottom wall, in the toe section 11, is a front 
bearing tongue seat 22, and in the heel section 13, a rear bearing tongue 
seat 25. The front bearing tongue seat 22 forms a hump 23 in the upper 
surface of the bottom wall 7. 
Forwardly of the front bearing tongue seat 22, at the forward end of the 
toe section of the bottom wall, is an upwardly forwardly sloping web 27, 
extending between the bottom wall and the frontmost part of the side wall 
15. A stop bolt aperature 29 extends through the sloping web 27. In this 
embodiment, the bolt aperature has its axis perpendicular to the plane of 
the surface of the web. As will be explained, the bolt aperature 29 can be 
defined by edges that are vertical. A stop bolt 30 extends through the 
aperature 29 (see FIG. 2). The stop bolt 30 has a head 32 at one end and a 
threaded section on its other. 
Front rivet bosses 36 and rear rivet bosses 37 are, in this embodiment, 
integral with and inboard of the rim 35. 
The bore 19 of toe end shaft boss 18 has a restricted lower passage part 
119 and an upper, enlarged passage part 219. The upper passage part 219 
forms a seat 43. The heel end shaft boss 20 has a restricted lower passage 
part 120 and an upper, enlarged passage part 220. The upper passage part 
220 forms a seat 45. 
The toe end tongue seat is defined by an upwardly forwardly sloping wall 
part 52, a generally vertical wall part 53, and a domed bearing area 54. 
The heel end tongue seat is defined by an upwardly rearwardly sloping wall 
part 55, a generally vertical wall part 56 and a domed bearing area 57. 
On the undersurface of the bottom wall 7 around the conical toe end boss is 
a seat 60 defined by a lip 61. A seat 62 around the conical heel end boss 
20 is defined by a lip 63. 
Except for the hump 23 and the bosses 18 and 20, the upper surface of the 
bottom wall 7 is substantially flat and the wall itself is of generally 
uniform thickness. 
The sole plate of this invention is given rigidity and strength in its long 
direction by the provision of a steel shape 46 (see FIGS. 5 and 16). In 
the embodiment shown, the shape 46 is in the form of an elongated, heavy 
gauge strap. The shape 46 is shown as having four, internally threaded 
spuds, a stop spud 47, a forward spud 48, a short shoe rear spud 49, and a 
medium shoe rear spud 50. In the embodiment shown, the spuds are formed 
integrally with the strap by piercing and drawing the strap to form a 
depending sleeve or boss, which is then internally threaded. The stop spud 
47, in the toe end of the shape, is somewhat elongated in plan view, and 
its threads are oriented perpendicular to the slope of the web 27. The 
forward spud 48 has threads in a vertical surface, as do the rear spuds 49 
and 50 
The spud 47 is positioned coincidentally with the opening 29 so as to 
receive the bolt 30. The spud 48 is coaxial with the bore 19, and extends 
into and is seated in the seat 43 of the boss 18. The spud 49 is 
positioned coaxially with the bore 21 and is seated in the seat 45 of the 
boss 20. When the sole plate and wheel trucks are assembled as is 
described hereinafter, the shape forms with the bottom wall 7, between the 
forward part of the toe end and the rearmost edge of the boss 20, a sort 
of box beam which provides strength and rigidity in the long dimension of 
the sole plate. The provision of more than one rear spud permits the use 
of the same shape for more than one size sole plate. 
Toe and heel end trucks 64 can be identical. Each has an axle journal 65 
with an axle receiving bore 67, a tongue 69, reinforcing gussets 70, an 
offsetting bracket 72 and a mounting platform 75. In the embodiment of 
truck shown, the mounting platform 75 has an integral sleeve defining an 
opening of large diameter as compared with the passages 19 and 21, with an 
upper rim 77 and a lower rim 78. In this embodiment, each of the mounting 
platforms 75 is sandwiched between an upper rubber mounting sleeve 79 and 
a lower rubber mounting sleeve 80. The upper sleeve 79 is molded with a 
seat 81 in its lower surface and the lower sleeve 80, with a seat 82 in 
its upper surface to receive the upper and lower rims 77 and 78 
respectively. The upper sleeve also has a seat 97 formed complementarily 
to the truncated conical lower end of the bosses 18 and 20, the upper end 
of the sleeves 79 seating in the seats 60 and 62, respectively. 
Both trucks are mounted on support shaft bolts 83. In the embodiment shown, 
each bolt 83 has a slotted head 84 at its lower end, a smooth shaft 85 
extending through the opening in the mounting platform sleeve and the 
passages in the lower ends of the bosses 18 and 20, and a threaded upper 
end portion 86 extending through the upper passage of the bosses and 
threaded into the spud of the shape seated in the seat of the particular 
boss. 
An axle 100 journaled in bore 67 and wheels 101 are conventional. 
The tongue 69 of the front wheel truck is mounted in front bearing tongue 
seat 22, and the tongue 69 of the rear wheel truck is mounted in the rear 
bearing tongue seat, as shown in FIG. 2, for limited skewing of the axles 
with respect to the longitudinal axis of the skate as is well known in the 
steerable roller skate art. 
As will be readily apparent from the drawings, there are no reentrant 
angles in the bottom wall, support shaft bosses 18 and 20, or bearing 
seats 22 and 25. There are no internal threads in any of the sole plate 
parts. Accordingly, the sole plate can be molded in a simple two-piece 
mold with a straight draw. The stop bolt aperature 29 is designed to be 
made with split straight core pins, the upper half of the opening being 
formed by a semicircular pin in the lower half of the mold, and the lower 
half of the aperature being formed by a semicircular pin in the upper half 
of the mold. However, because the stop or bumper 33 is carried by the spud 
47, hence by the shape 46, the aperature 29 can be made with edges that 
are substantially vertical, rather than perpendicular to the adjacent, 
sloping surface of the sole plate, to obviate the need for split pins. 
Numerous variations in the construction of the skate of this invention 
within the scope of the appended claims will occur to those skilled in the 
art in the light of the foregoing disclosure. The sole plate can be made 
of either plastic or metal, but in any event, can easily be made in one 
piece in a simple molding operation. The rim on the sole plate can define 
a plane surface, rather than a rising, contoured, one. A channel running 
lengthwise of the sole plate can be provided to accomodate the shape, 
leaving the adjacent surface of the top of the sole plate flat. The shape 
can be made in any desired form, such as a channel, or provided with a 
longitudinal center rib. The spuds can be provided by welding nuts to the 
shape or by merely tapping holes in the shape itself, without drawing a 
sleeve or boss member of the sort shown in the preferred embodiment, 
although it is preferable to have either an integral cup-shaped spud or a 
welded nut, to seat in the upper end of the bosses, both for strength and 
for the purpose of locating the shape. The shape can be bent up at its 
forward end, to permit the spud to be threaded on surfaces perpendicular 
to the plane of the shape. Various reinforcing ribbings can be provided in 
the sole plate, and the exact configuration of the sole plate can be 
varied widely, as can the construction of the trucks. These are merely 
illustrative.