Construction of door glass runs in motor vehicle

Construction of door glass runs in a motor vehicle, wherein: there are provided vertical side glass runs and a top side glass run, which are secured to vertical sides and a top side of a door frame, respectively, in vehicle door with the door frame; the vertical side glass runs slidably guide a forward end sliding portion of a slider in the opening or closing direction of a door glass and restrain the forward end sliding portion in the direction of thickness of the door glass, the slider is mounted to end edges of the door glass in the longitudinal direction thereof, and, has the forward end sliding portion shifted into a compartment and being of a crank shape in cross section; and the top side glass run has an inner lip for contracting the inner surface of a top end edge of the door glass to seal when the door glass is fully closed; the inner lip in the top side glass run is decreased in cross section thereof toward the vertical side glass runs within a range of contacting the slider when the door glass is fully closed, made gradually thinner at the distal ends thereof in wall thickness than the other general portion thereof and thicker at the proximal ends thereof in wall thickness than the other general portion thereof.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to construction of door glass runs in a motor 
vehicle, and more particularly, to improvements in construction of glass 
runs in a motor vehicle, wherein a door glass is guided through sliders, 
the forward end sliding portions of which are secured to end edges of a 
door glass in the longitudinal direction thereof in the motor vehicle and 
shifted into a compartment. 
2. Description of the Related Art 
Door glasses are subjected to a force sucking the door glasses outwardly 
due to a difference in pressure between the interior and the exterior of a 
compartment during running of a motor vehicle at high speed. 
To restrain the door glass in the direction of the thickness thereof to 
control an outward displacement of the door glass during running at high 
speed, end edges of the door glass in the longitudinal direction thereof 
are guided by door glass guides being U-shaped in cross section. 
Here, such disadvantages are presented that the outer side portion of the 
door glass guide should necessarily be protruded outwardly from the outer 
surface of the door glass to increase air resistance during running of the 
motor vehicle at high speed and a so-called wind whistle is increased. 
To obviate the above-described disadvantages, as disclosed in U.S. Pat. No. 
2,024,773 for example, there has been proposed such construction that 
sliders being generally crank-shaped in cross section are secured to the 
end edges of the door glass in the longitudinal direction, and the forward 
end of the slider shifted into the compartment of the slider is guided in 
the vertical direction by guides provided on the door frame. 
In this case, the outer surfaces of the door frame and of the door frame 
can be made generally flush with each other. 
Here, as shown in FIG. 3, a glass run 1 constituting the door glass guide 
has a vertical side glass run 1A and a top side glass run 1B, which are 
secured to vertical sides and a top side of the door frame. 
The vertical side glass run 1A has an inner lip 5A and an outer lip 5B, 
which come into a contact with a foward end sliding portion 4A of a slider 
4 being generally crank-shaped in cross section, which is secured to an 
end edge 3A of a door glass 3 in the longitudinal direction thereof. 
On the other hand, the top side glass run 1B is not required to guide the 
door glass 3, but required only to have a function of contacting the top 
end edge 3B to seal a space between the door glass 3 and the top side of a 
door frame when the door glass 3 is fully closed. Consequently, in 
general, the top side glass run 1B has an outer lip 6B to be clamped 
between the top end edge 3B of the door glass 3 and the top side of the 
door frame and an inner lip 6A coming into contact with the inner surface 
of the top end edge 3B of the door glass 3, when the door glass 3 is fully 
closed. 
In the above-described top side glass run 1B, if the inner lip 6A would be 
decreased at the distal end thereof in wall thickness, then wave-shaped 
deformations would be generated at the distal end of the inner lip 6A, 
during production or assembling to the door frame. Hence, as shown in FIG. 
3, the distal end of the inner lip 6A is made thicker in wall thickness 
than the other portion. 
Furthermore, as shown in FIG. 3, the inner lip 6A is formed into a 
continuously similar cross section and has a gradually decreased cross 
sectional area toward the vertical side glass run 1B in a manner to be 
smoothly connected to the inner lip 5A in the vertical side glass run 1A 
and not interfere with the slider 4 within a range X, in which the slider 
4 comes into contact with the door glass 3 when the door glass 3 is fully 
closed. 
However, the top side glass run 1B provided with the inner lip 6A having 
the above-described construction cannot follow the configurations of the 
door glass 3 and the slider 4 in a portion ranging from the door glass 3 
to the slider 4 when the door glass is fully closed, whereby a triangular 
gap 7 is formed between the door glass 3, the slider 4 and the inner lip 
6A as shown in FIG. 4, so that the sealing function is deteriotated. 
SUMMARY OF THE INVENTION 
It is therefore the primary object of the present invention to provide a 
construction of door glass runs in a motor vehicle, wherein a triangular 
gap is eliminated from a portion ranging from the door glass to the slider 
as defined between the door glass, the slider and the inner lip of the top 
side glass run when the door glass is fully closed. 
To this end, the present invention contemplates that, in construction of 
door glass runs in a motor vehicle, wherein: there are provided vertical 
side glass runs and a top side glass run, which are secured to vertical 
sides and a top side of a door frame, respectively, in a vehicle door with 
the door frame; the vertical side glass runs slidably guide a forward end 
sliding portion of a slider in the opening or closing direction of a door 
glass and restrain the forward end sliding portion in the direction of 
thickness of said door glass, said slider is mounted to end edges of the 
door glass in the longitudinal direction thereof, and, has said forward 
end sliding portion shifted into a compartment and being of a crank shape 
in cross section; and said top side glass run has an inner lip for 
contacting the inner surface of a top end edge of the door glass to seal 
when the door glass is fully closed; the inner lip in the top side glass 
run is decreased in cross section toward the vertical side glass runs 
within a range of contacting the slider when the door glass is fully 
closed, made gradually thinner at the distal ends thereof in wall 
thickness than the other general portion thereof and thicker at the 
proximal ends thereof in wall thickness than the other general portion 
thereof. 
To the above end, the present invention contemplates that said inner lip 
tapered at the distal ends thereof. 
To the above end, the present invention contemplates that the top side 
glass run has an outer lip to be clamped between the top end edges of the 
door glass and the slider and the top side of the door frame when the door 
glass is fully closed. 
To the above end, the present invention contemplates that the vertical side 
glass run has an inner lip and an outer lip for contacting the inner 
surface and the outer surface of the forward end sliding portion, 
respectively, the inner lip of the vertical side glass run and the inner 
lip of the top side glass run are formed smoothly continuous each other at 
a corner portion of the door frame. 
According to the present invention, the distal end of the inner lip of the 
top side glass run, at a portion contacting the slider when the door glass 
is fully closed is thinner in wall thickness than the other general 
portion and the proximal end of the inner lip is thicker in wall thickness 
than the other general portion, so that the inner lip can follow the 
surfaces of the door glass to the slider when the door glass is fully 
closed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Description will hereunder be given of one embodiment of the present 
invention with reference to the drawings. 
As shown in FIGS. 1 and 2, according to this embodiment, in a door glass 
runs 11 in a motor vehicle, wherein: there are provided vertical side 
glass runs 12 and a top side glass run 14, which are secured to vertical 
sides 10A and a top side 10B of a door frame 10, respectively, in a 
vehicle door, not shown, with the door frame 10; the vertical side glass 
runs 12 slidably guide a forward end sliding portion 18A in a slider 18 in 
the opening or closing direction of a door glass 16 and restrain the 
forward end sliding portion 18A in the direction of thickness of the door 
glass 16, the slider is mounted to end edges 16A of the door glass 16 in 
the longitudinal direction thereof, and, has the forward end sliding 
portion 18A shifted into a compartment and being of a crank shape in cross 
section; and the top side glass run 14 has an inner lip 14A for contacting 
the inner surface of a top end edge 16B of the door glass 16 to seal when 
the door glass 16 is fully closed; the inner lip 14A in the top side glass 
run 14 is decreased in cross section thereof toward the vertical side 
glass runs 12 within a range X of contacting the slider 18 when the door 
glass 16 is fully closed, made gradually thinner at the distal ends 14C 
thereof in wall thickness than the other general portion thereof and 
thicker at the proximal ends 14D thereof in wall thickness than the other 
general portion thereof (Refer to FIG. 2). 
The inner lip 14 is tapered at the distal ends 14C thereof, and the 
sectional shape of the general portion is shown at the left end in FIG. 1. 
The vertical side glass run 12 has an inner lip 12A and an outer lip 12B 
for contacting the inner surface and the outer surface of the forward end 
sliding portion 18A, respectively, the inner lip 12A of the vertical side 
glass run 12 and the inner lip 14A of the top side glass run 14 are formed 
smoothly continuous each other at a corner portion of the door frame 10. 
Designated at 14B is an outer lip in the top side glass run 14. The outer 
lip 14B is clamped between the top end edges of the door glass 16 and the 
slider 18 and the top side 10B of the door frame when the door glass 16 is 
fully closed. 
In this embodiment, the sectional shape of the outer lip 14B of the top 
side glass run 14 is gradually decreased in sectional area toward the 
vertical side glass runs 12 within a range X of contacting the slider 18 
and the distal end of the inner lip 14A is decreased in wall thickness, 
whereby the outer lip 14A can satisfactorily follow and contact surface of 
the door glass 16 and the slider 18 contiguous thereto, so that the 
sealing performance of the glass run at a corner portion where the 
vertical side glass run 12 is connected to the top side glass run 14 is 
improved. 
Further, as the inner lip 14A is thicker at the proximal end 14A thereof in 
wall thickness than the other general portion thereof, wave-shaped 
deformations would not be generated at distal end 14C of the inner lip 
14A, during production or assembling to the door frame 10.