Snap-in attachment of window pane lift plate to window regulator

A glider block assembly for a window regulator in a motor vehicle structure includes a glider block and a spring clip adapted to receive a pin with an engaging head extending from a window lift plate. The glider block has an opening sized to receive the pin and a guide pin slot intersecting the opening. The spring clip is disposed in the spring clip slot and provides an entry gap smaller than the engaging head. The clip extends in part across the opening to provide an entry gap smaller than the engaging head. The spring clip expands to allow the engaging head to pass therethrough in response to pressure of the head thereagainst when the pin is received by the block and snaps back behind the head, thereby retaining the plate to the block.

TECHNICAL FIELD 
This invention is directed to motor vehicle window regulators and window 
mounting devices, and more specifically to an interface between the 
regulator and the window mounting devices. 
BACKGROUND OF THE INVENTION 
Window regulators are used to move glass window panes in motor vehicles 
between open and closed positions. The window pane moves within guide 
channels provided by the motor vehicle door structure. The window 
regulator moves the window pane up and down between an upward closed 
position and a downward open position with the guide channels in the door 
guiding the glass in its movement between the open and closed positions. 
The window pane is commonly supported by a lift plate attached to the 
regulator by threaded fasteners. Assembly of the lift plate to the 
regulator is accomplished by providing the lift plate with a threaded stud 
which is passed through an aperture in the regulator, and subsequently 
threading a nut over the end of the stud. Because this assembly operation 
must often be executed in a hard to reach part of the door offering 
limited or no visibility, it requires a great deal of dextterity and car 
to install the nuts without dropping them. Dropped nuts remaining in the 
door may rattle in the completed vehicle. 
A difficulty with installing the window regulator into a door is that the 
upward and downward path of the window pane must be parallel to the guide 
channels so that the window pane does not get stuck. One way to achieve 
this is to align guide tracks of the regulator parallel to the guide 
channels. Producing such alignment can be difficult, as it may require 
aligning the regulator with respect to the guide channels so that the 
window is provided with the necessary orientation to allow it to move 
freely in the guide channel when moved by the regulator. 
It is desired to provide an attachment between the lift plate for the 
window pane and the window regulator requiring no loose parts such as 
nuts. It is also desired to provide such an attachment rendering the 
operation of the window relatively insensitive to the mounted position of 
the window regulator relative to the position of the guide channels. 
SUMMARY OF THE INVENTION 
A glider block assembly for a window regulator in a motor vehicle 
structure, adapted to receive a window lift plate having a pin with an 
engaging head spaced from a plate surface, is disclosed comprising a 
glider block and a spring clip. The glider block has an opening sized to 
receive the pin and a guide pin slot intersecting the opening. The spring 
clip is disposed in the spring clip slot and defines an entry gap smaller 
than the engaging head. The clip extends in part across the opening to 
provide an entry gap smaller than the engaging head. The spring clip 
expands to allow the engaging head to pass therethrough in response to 
pressure of the head thereagainst when the pin is received by the block. 
With the head moving past the clip, the clip snaps back behind the head, 
thereby retaining the plate to the block. 
A snap-in attachment between a glider block and a lift plate for a window 
regulator in a motor vehicle structure with the lift plate adapted to 
receive a window pane is disclosed comprising the lift plate, the glider 
block and a spring clip. The lift plate has a pin with an engaging head 
spaced from a plate surface. The glider block defines an opening sized to 
receive the pin and defines a clip slot intersecting the opening. The 
spring clip is disposed in the clip slot and extends in part across the 
opening defines an entry gap smaller than the engaging head. The spring 
clip expands to allow the engaging head to pass therethrough in response 
to pressure of the head thereagainst and snaps back behind the head, 
thereby retaining the plate to the block. 
A window system is disclosed for use in a motor vehicle structure providing 
first and second window guide channels enables an operator to move a 
window pane from a downward open position to an upward closed position and 
comprises a window regulator, a lift plate and a glider block. The window 
regulator is functionally disposed between the vehicle structure and the 
window pane and is responsive to operator input to raise and lower the 
window pane. The lift plate has a pin with an engaging head spaced from a 
plate surface and is fixed to a lower portion of the window pane. The 
glider block assembly is part of the regulator and defines an opening 
sized to receive the lift plate pin and has a spring clip intersecting the 
opening and defining an entry gap smaller than the engaging head. The 
spring clip expands to allow the engaging head to pass therethrough in 
response to pressure of the head thereagainst and snaps back behind the 
head, thereby retaining the plate to the block. 
The snap-in attachment of the present invention employs a spring clip and 
engaging pin combination which eliminates the need for any loose fasteners 
such as bolts and nuts, thereby eliminating the possibility of loose 
fasteners falling into the structure and facilitating installation of the 
window. The present invention also provides a substantially horizontal 
slot that is part of the snap-in attachment providing relative float in 
the fore-aft direction between the window pane and the window regulator, 
allowing the guide channels to position the window pane in the fore-aft 
direction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
A window system 10 shown in FIG. 1 is mounted in a vehicle door 12. The 
door 12 has a fore guide channel 14 and an aft guide channel 16. The fore 
and aft guide channels 14 and 16 are substantially C-shaped, are open 
toward each other, and are spaced to receive a window pane 18 for slidable 
disposition therein. The channels 14 and 16 extend to the window opening 
20 in the door 12. 
The door 12 has an inner panel 22 and an outer panel 24. A dual lift cable 
and drum type regulator 26, as illustrated in FIG. 1, is mounted to the 
inner panel 22. 
The regulator includes fore and aft tracks 28 and 30. A glider block 32 is 
slidably disposed on each of the tracks 28, 30. A motor and drum assembly 
34 is mounted to the inner panel 22. Pulleys 36 are disposed at top and 
bottom ends of the racks 28 and 30. A first cable 38 extends vertically 
upward from the glider block 32 on the fore track 28, wrapping around the 
upper pulley and traversing the door diagonally downward to the lower 
pulley of the aft track. The first cable then extends vertically upward to 
the glider block 32 on the aft track 30. A second cable 40 extends 
vertically upward from the glider block 32 on the aft track 30, around the 
pulley 36 at the top of the aft track 30, and diagonally downward to the 
motor and drum assembly 34. A third cable 42 extends from the motor and 
drum assembly 34 diagonally downward to the pulley 36 at the bottom of the 
fore track 28 and extends vertically upward to the glider block 32 on the 
fore track 28. It should be appreciated that a hand crank mechanism can be 
substituted for the motor in the motor and drum assembly 34. 
The regulator 26 is characterized as a dual lift regulator because it 
supports the window pane 18 at both fore and aft locations with the lift 
plates 44 attached to the glider blocks 32. 
The lift plates 44 have a C-shaped opening 46 receiving the window pane 18. 
An insulator 48 is disposed between the lift plate and the window pane 18. 
The lift plate 44 defines a lift plate surface 50 disposed beneath the 
window pane 18. A pin 52 is pressed into the lift plate 44 and projects 
out from the lift plate surface 50. An engaging head 54 of the pin 52 is 
defined by a neck 56 in the pin, with the engaging head 54 being spaced 
from the plate surface 50. 
The glider block 32 is molded of plastic. The block 32 defines an elongated 
opening or slot 58 with a first width approximately equal to but slightly 
larger than the engaging head 54 of the pin 52, and a substantially larger 
second width. The slot, or opening, 58 is maintained in a generally 
horizontal position. The block 32 has a tapered lead 60 surrounding the 
opening 58 to facilitate entry of the pin 52. The tapered lead 60 is 
provided by a plurality of ribs 61 in the preferred embodiment. The ribs 
61 are used to provide the tapered lead instead of a smooth forming so as 
to not to exceed a maximum section thickness permitted by plastic molding. 
A clip slot 62 intersecting the opening 58 is also defined by the guide 
block 32. The clip slot 62 is preferably configured to be substantially 
parallel to the lift plate surface 50. The block 32 also has a track slot 
64 perpendicular to the elongated opening 58 accommodating its sliding 
disposition on either of the tracks 28, 30. The block 32 has pockets 66 
for receiving cable ends. The glider block 32 has an engagement spring 
provided by a pair of horizontally extending, arcuately shaped leaf 
springs 68. The leaf springs 68 are configured to contact the lift plate 
surface 50 to eliminate tilting of the block 32 relative to the lift plate 
44. One of the leaf springs 68 in the preferred embodiment is shown as 
being split into two parallel sections. Alternatively, the engagement 
spring can take forms other than the leaf springs 68. For example, a foam 
rubber pad (not shown) can be positioned between the block 32 and the lift 
plate 44 to provide the desired bias therebetween. 
A spring clip 70 is disposed in the clip slot 62. The clip is disposed in 
part across the opening 58 and in a first position, shown in FIGS. 2 and 
3, and defines an entry gap smaller than the engaging head 54. The spring 
clip 70 is expanded at a closed end 72 and an open end 74 to retain the 
clip 70 in the clip slot 62. A combination of the glider block 32 and the 
spring clip 70 may be identified as a glider block assembly. 
The present invention is advantageously employed in the following manner. 
Two lift plates 44 are bonded to a lower edge of the window pane 18 in 
predetermined locations for alignment with the tracks of the window 
regulator assembly 26. The window regulator assembly 26 is placed in the 
door. The aft track 30 is fixed to the inner panel 22 by two pre-mounted 
screws, one at each of the top and the bottom of the tracks. This motor 
and drum assembly 54 is also mounted to the inner panel 22. The assembled 
window pane 18 and lift plates 44 are inserted into the fore and aft guide 
channels 14, 16 of the door 12. The glass is positioned so that the pins 
52 are aligned with the elongated openings 58 of the blocks 32. The pins 
52 are then forced into the openings 58, being guided by the tapered lead 
60, and engaging the spring clip 70. Forcing the engaging head 54 against 
the spring clip 70 causes the spring clip to expand, from the first 
position to a second position (not shown), allowing the engaging head 54 
to pass therethrough with the spring clip 70 snapping back behind the head 
54 and into the neck 56 of the pin 52. This provides a positive lock 
between the lift plate 44 and the guide block 32, thereby retaining the 
plate 44 to the block 32. The leaf springs 68 engage the lift plate 
surface 50, minimizing any tendency of the block 32 to rattle or otherwise 
move on the pin, as well as tending to minimize any twisting moments 
between the block 32 and the lift plate 44. 
The window pane 18 is raised to the closed position by energizing the motor 
to displace the guide blocks 32, and hence, the window pane 18. The fore 
track 28 is biased upward to seat the window pane 18 in an upper portion 
of the guide track (not shown) and is then fixed in place relative to the 
inner panel 22 with the upper and lower mounting screws. Only this 
vertical positioning of the fore track 28 is necessary to position both 
the window pane 18 and the regulator 26, as the elongated openings 58 
accommodate relative fore aft movement between the window pane 18 and the 
fore and aft tracks 28 and 30. The slots 58 also allow the pins 52 to 
rotate freely therein, further facilitating installation of the regulator 
26 and subsequent up and down movement of the window 18 without the 
regulator binding or sticking. 
The attachment of the glass window pane 18 to the regulator 26 is thereby 
accomplished very quickly with substantially no chance of fasteners being 
dropped into the door where they could potentially cause a rattle. 
Additionally, this snap-in attachment saves a significant amount of time, 
and therefore labor cost, in the installation and assembly of a window 
pane and regulator in a vehicle door. Servicing of the door 12 is also 
benefitted by this invention. The window pane 18 is easily removed from 
the door 12 by first sliding out the spring clips 70 in a direction 
parallel to the slot 58, and then lifting the window pane 18 out through 
the window opening 20. 
Other aspects, objects and advantages of this invention can be obtained 
from a study of the drawings, the disclosure and the appended claims.