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Патент USA US3098687

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July 23, 1963
M. PEARLSTINE
3,098,678
GLIDER cousmucmn
Filed June 6, 1960
2 Sheets-Sheet 1
‘ INVENTOR.
M01970” PA'AIPLS mu;
July 23, 1963‘
M. PEARLSTINE
3,098,678
GLIDER CONSTRUCTION
Filed June 6, 1960
2 Sheets-Sheet 2 .
INVENTOR.
M01? 7011/ F571,?! S7//1/£
United States Patent 0
Patented July 23, 1963
1
2
3,098,678
glider which has a stable rest position from which the seat
does not tend to wander unless urged by an occupant.
A still further object of my invention is to provide a
GLIDER CONSTRUCTION
Morton Pearlstine, Bala-Cynwyd, Pa., assignor to The
Bunting Company, Inc., Philadelphia, Pa., a corpora
tion of Pennsylvania
Filed June 6, 1960, Ser. No. 34,252
5 Claims. (Cl. 297-344)
novel glider which utilizes a pair of ball bearings spaced
apart longitudinally along the length of and disposed be
tween a pair of vertically separated parallel extending
tracks, and the provision of novel means for maintaining
constant the spacing between the ball bearings.
The foregoing and other objects will become clear from
a careful reading of the following speci?cation in conjunc
This invention relates to sitting furniture, and more
particularly relates to sitting furniture of the glider type
as disclosed in my earlier ?led co-pending application for
tion with an examination of the several drawings, where
United States Letters Patent, ‘Serial No. 748,889, ?led
July 16, 1958, now ‘Patent No. 2,959,210, the instant ap
plication being a continuation-in-part ‘thereof and repre
senting an improvement thereover in certain particulars.
Gliders are characterized by their ability to oscillate with
a generally forward and backward gliding motion under
the control of an occupant of the glider seat, such mo
tion giving rise to the generic name “glider.”
In the past, various types of so—called gliders have been
devised which provide a motion more nearly like that of
a swing than that of a true glider but which nevertheless
are classed as gliders. ‘Generally, these devices include
in:
FIGURE 1 is a perspective view of a multiple seat
15
glider constructed according to and embodying the prin
ciples of the invention;
FIGURE 2 is a side elevation of the glider of ‘FIGURE
1 illustrating the seat in rearward displaced position;
FIGURE 3 is an enlarged exploded perspective view
of the improved gliding mechanism ‘according to the in
vention;
FIGURE 4 is an enlarged fragmented side sectional
view of the improved gliding mechanism illustrating the
ball-bearing support for the seat frame;
FIGURE 5 is a cross-sectional view of the improved
suspended by pivoted vertical hangers a seat of some kind. 25 glide mechanism taken along the lines 5—-5 of FIGURE
1; and,
As the seat is moved back and forth by the occupant it
FIGURE 6 is a cross-sectional view of the improved
rises and falls much in the manner of a pendulum. More
a stand which rests on the ?oor and from which is freely
glide mechanism taken along the lines 6-6 of FIG
over, because of the hanger suspension system, an appreci~
URE 1.
able undesirable side-sway usually occurs unless the fore
‘In the several ?gures, like elements are identi?ed by the
and back motion is restricted. The combined pendulum
same reference numerals.
motion and side-sway is generally unpleasant and is some
Turning now to a consideration of FIGURES 1 and 2
times unsettling to the stomach. Also annoying is the
for a general understanding of the glider structure and
tendency of the seat to knock against the stand when the
manner of operation, it will be seen that the glider con
glider is being operated which causes the seat to twist and
shudder. lMy invention differs from these so-called 35 sists essentially of three major types of functional unit.
The ?rst functional unit includes a back-rest assembly 10
gliders in that it is not subject to the shortcomings here
modi?ed swing.
and a pair of side frame and arm-rest assemblies '11 se
cured to a seat assembly 12. The second functional unit
of horizontally extending parallel tracks spaced vertically
latter sections the side frames 11 of the ?rst unit are se
inbefore described, but is in fact a true glider and not a
The glide mechanism according to the invention, as set 40 consists of a pair of double track assemblies 13, which
assemblies include a pair of floor engaging lower track
forth in complete detail in my aforesaid co-pending ap
sections 14 and a pair of upper track sections 15, to which
plication for United States Letters Patent, utilizes a pair
cured. A pair of ball bearings 16 between the upper and
ing ball bearings. The lower track of the pair is formed 45 lower track sections of each double track assembly 13
provide a low friction translation bearing which permits
with a pair of spaced apart dirnpled depressions, one of
relative fore and aft motion of the upper track sections 15
the ball bearings being normally disposed in the bottom
relative to the lower track sections '14. Since the side
of each depression when the glider is in its centered at
frames 11 of the ?rst unit are rigidly secured to- the upper
rest position. As the glider is shifted fore and aft, it is
desired that the ball bearings roll forward and back 50 track sections 15 of the second unit, the ?rst unit will, of
course, travel with the upper tracks 15 as they move fore
ward in the depressions while maintaining a constant
one above the other and separated by a pair of interven
and aft. Each double track assembly 13 also includes a
pair ofrlateral retainer brackets 17 secured to the lower
It has been found that after a period of extended use
track section 14 and extending non-engagingly upward on
there may occur a noticeable change in the interball spac—
ing, so that, while one ball may be disposed in the bottom 55 both sides of each upper track section 15 to prevent the
latter from sidewise shifting. The third functional unit
of its associated depression, the other ball may be found
interball spacing.
consists of a pair of linkages 18 rigidly secured at their
to have wandered and be somewhat displaced from, the
upper end to the seat assembly ‘12 and side frame assem
bottom of its depression. This condition is, of course,
blies 11 of the ?rst unit by an eye bolt 19, and pivotally
undesirable since it tends to decrease the at-rest stability
of the glider. The present invention is directed toward 60 secured at their lower end to the lower track section ‘14
of the second functional units ‘by a yoke 20. The eye
elimination of this condition by providing relatively
bolt 19 and yoke 20 are intercoupled by an extensible
simple, but highly effective, means for insuring the con
spring 21.
stancy of the interball spacing. Accordingly, it is a prin
In operation, the ?rst functional unit and the upper
cipal object of my invention to provide a novel glider
whose seat motion is characterized by being substantially 65 track sections 15 ride back and forth on the ball bearings
16 which roll in the bottom track sections .14 along a
rectilinear in the fore and back direction.
straight-line path, thus accomplishing the objects of elim
Another object of my invention is to provide a novel
inating the undesirable pendulum swing motion, side
glider which is free of side-sway during use.
sway, and twisting motion previously described. The
Still another object of my invention is to provide a
novel glider which has no tendency to impart a twisting 70 linkages 18, together with a particular structural con?g
uration of the track sections 14 and 15 to be subsequent
motion to the seat when the latter is in motion.
ly described, operate to provide a stable rest position from
Yet another object of my invention is to provide a novel
3,098,678
3
4
which the seat does not tend to wander unless urged by
than the contact points with the lower track because the
upper track is straight while the lower track is curved in
an occupant.
As the seat moves either backward or for
ward from its at-rest position illustrated in FIGURE 1,
the spring 21 of the linkage 18 is stretched and, therefore,
exerts a restoring force which tends to pull the seat back
to the centered at-rest position.
FIGURE 2 illustrates a
backward displaced condition of the seat, and it is readily
the depressed regions 31. The ball bearings would, there
fore, appear to roll on one track, and at certain points to
slide on the other track for very small but ?nite distances,
thereby resulting in a slight displacement. The small dis
placements may aggregate over a period of time and re
sult in the aforenoted relative shift between the ball
seen that the yoke 20 has tilted backwards in response to
the pull of the stretched spring 21.
bearings.
For a clear understanding, of the constructional details 10
The elimination of this creep e?ect is achieved in the
of the invention turn now to a consideration or" FIG
URES 3, 4, 5 and 6. The cross-sectional views of FIG
URES 5 and 6 show that the upper and lower track sec—
present invention by providing means for substantially
equalizing the path length traversed by the ball bearing
points of contact with both tracks, and by additionally in
tions ‘15 and v14 illustrated in the other ?gures preferably
corporating a ball bearing harness device which insures
comprise a pair of tubular members depressed inward to 15 control of any long term residual creep effect due to in
form a V-shaped groove extending substantially the entire
complete symmetry of the tracks arising as a consequence
length of each member, the grooved faces presenting verti
of manufacturing tolerances. As will be seen, the har
cally toward each other and held in spaced relation by
ness device may also act as a ball bearing captive and
the ball bearings ‘16. As best seen in 'FIGURE 4, the
motion limiting apparatus.
rivets 28 secure the lateral retainer brackets 17 to ‘the 20
FIGURES 3 and 4 illustrate the path length equalizing
lower track section 14, the rivets 27 secure the foot pads
means, wherein it is observed that the upper track 15
‘26 also to the lower track section, and the bolts l9 secure
has been provided with a pair of dimpled depressions 31’
the lower rail of the side frames 11 to the upper track
spaced apart lengthwise of the track by the same amount
section 15. As best seen in FIGURES 3 and 5, the yoke
as the lower track depressions 31 are spaced from one an
20 of the linkage 18 is pivotally horizontally pinned to the 25 other, the depressions 31’ being symmetrical to the de
lower track section 14 by the bolt assembly 30. The bolt
pressions 31. Observation of FIGURE 4 also shows that
assembly 30 includes the bushings 3'5, bolt 37 and nut 3-9.
the upper and lower tracks .15 and 114 respectively are
Assembly of the yoke 20 to the track v14 is carried out by
identical except for the end depressions in the lower track
projecting the bushings 35 outward through the bushing
where the pads 26 are secured by the rivets 27, and thus
holes 36 in the yoke 20, aligning the bolt-receiving holes 30 both tracks may be formed with the same equipment to
38 in the track 14 with the bores through the bushings 3'5,
projecting the bolt 37 through the bushings and the track
thereby insure very close symmetry in the regions of im
portance, namely the depressions 3‘1 and 3-1’.
and securing the bolt end with the nut 39. The clearest
The harness device is seen in various aspects in all of
view of the assembled yoke 20 and track ‘14 is illustrated
the ?gures, a perspective view being shown in FIGURE 3
in the showing of FIGURE 5, wherein it will be observed 35 and sectional views being illustrated in FIGURES 4, 5
that the bushings 35, which are made of a low friction
and 6. Referring ?rst to FIGURE ‘3, the harness is ob
material, prevent metal-to-metal contact between the yoke
served to include a pair of generally C-shaped yoke mem
and the track so that the yoke is freely pivotable on the
bers 40, spaced apart a distance equal to the spacing be
bushings.
tween the bottoms of the spaced depressions 31 in the
The sectional view of FIGURE 4 additionally shows 40 lower track 14 or 3.1’ in the upper track 15. Each of
that the track section 114 is dimpled downward, as vat 31,
the yoke members 40 includes a central portion 41 and a
to provide a very shallow but de?nite valley. These
pair of incurved arms 42 extending downward from op
dimples are so located that the ball bearings 16 lie therein
posite sides of the central portion, the central portion being
when the seat is in its centered tat-rest position as illus
apertured, as at 43, so that the ball bearings ‘16 may pro
trated in FIGURE 1. By virtue of this dimpled construc— 45 ject upward partially therethnough for rolling contact with
tion and the spring-loaded linkages 18, the seat tends to
the upper track 15. The yoke members 40 are coupled
remain in its centered position when the occupant does
together in ?xed spaced apart relation by means of the
not actively urge it backward or forward. ‘It should be
tie rod 44 whose opposite ends 45 are projected through
noted that the shallowness of the valley and smoothness
holes in the central portions 41 and turned back upon
of curvature are such as to preclude any awareness by the 50 themselves for securement.
seat occupant of departure from straight line motion while
As best seen in FIGURES 4, 5 and 6, the diameter of
at the same time being, suf?cient to e?ect the at-rest cen
the ball bearings ‘16 is somewhat larger than the diameter
of the apertures 43 in the yoke members 40 so that the
tering of the seat. ‘In this ?gure, the ball bearings ‘16 are
illustrated forward of the valley bottom and the yoke 20
ball bearings cannot pass upward completely therethrough.
is seen to be pivoted forward, whereas in FIGURE 2 the 55 Moreover, the arms 42 of the yoke members 40 are curved
ball bearings are shown rearward of the valley bottom
inward under the lower track '14, so that while each yoke
and the yoke 20 is pivoted backward, corresponding, of
40 may shift longitudinally along the track it may not be
course, respectively to forward and rearward displacement
shifted in a vertical direction. The ball bearings 16 are
of the seat.
thus held captive between the track v14 and the central
The aforedescribed portions of the apparatus are sub 60 portion 41 of the C-shaped yoke members 40, while at
stantially the same structurally and functionally as their
the same time being free to roll in the lower track.
corresponding parts shown and described in my aforesaid
Finally, the harness device also provides a motion
co-pending application for United States Letters Patent.
limiting eifect which prevents the ball bearings 16 from
As pointed out hereinbefore, it has been found that after
riding longitudinally out of the depressions 31 in the
a period of extended use there may occur a noticeable 65 lower track to thereby preclude either ball hearing from
change in the spacing between the ball bearings 16, so that,
running beyond the end of the track. The manner of
while one ball hearing may be disposed in the bottom of
achieving this result is most clearly seen in the showing
its associated dimpled depression 31, the other ball hear
of FIGURE 4, wherein it will be observed that continued
ing may be found to have assumed a position somewhat
right-directed travel of the ball bearings causes them to
displaced from the bottom of its associated depression, 70 rise vertically along the forward slope of the depressions
thus tending to decrease the at-rest stability of the glider.
31. The yoke members 40 are necessarily carried up
This creep, or wandering, of one ball bearing relative
ward with the ball bearings 16 upon which they are
to the other is believed to result from the difference in
seated, and, of course, it is evident that the yoke arms
path length traversed by the ball bearing points of con—
42 rise therewith until they contact the underside of the
75
tact points with the upper tracktraversing a shorter path
track 14, being thereupon prevented from further motion
3,098,678
5
V
and in turn restraining additional shifting of the ball
bearings longitudinally of the lower track 14. The same
mechanism obviously is operative in the reverse direction.
In the various ?gures, the parts illustrated may be
made of any suitable materials. For example, the back
rest frame 32, seat frame 33, side frame 11, and side
vertical spacing therebetween while maintaining said tracks
in said vertically spaced parallel relation by restricting
relative lateral movement therebetween, said superstruc
ture being secured to said second track for movement
therewith in fore and aft directions from an at-rest posi
tion relative to said ?rst track, and a resiliently distend
able linkage, one part of said linkage being secured to said
superstructure and second track assembly and another
part of said linkage being secured to said ?rst track,
vices are preferably made of metal, as are the parts of
the upper and lower track assemblies; and the bushings 10 whereby said superstructure and said second track assume
the at-rest position relative to said ?rst track when said
35 of the yoke bolt assembly 30- may be made of a suit
linkage is in its minimum distended condition and are
able plastic material, as for example nylon.
biased toward the at-rest position when said linkage is
It will be understood, of course, that the present in“
distended beyond said minimum distended condition as a
vention is susceptible to various changes and modi?cations
which may be made'from time to time without departing 15 result of departure of said superstructure and second track
in either direction from the at-rest position, said spaced
from the real spirit or general principles thereof, and ac
apart ball bearings being coupled together at a ?xed sepa
cordingly, it is’intended to claim the same broadly, as
ration by harness means extending therebetween, said
well as speci?cally, as indicated by the appended claims.
harness means being partly disposed between said ?rst
What is claimed as new and useful is:
and second tracks and partly disposed in embracing rela
20
1. In a glider, in combination, a rigid superstructure
frame tie-rods 34 may be made of wood or metal; the sev
eral parts of the linkages >18 and ball bearing harness de
including a seat and back rest unit, a pair of laterally
tion to said ?rst track.
~
4. In a glider, in combination, a rigid superstructure
including
a seat and back rest unit, a pair of laterally
said superstructure and extending fore and aft thereof, a
spaced parallel tracks secured to the bottom said said
pair of ?oor-supported elongated straight tracks respec
tively disposed beneath and in substantial vertical registry 25 superstructure and extending fore and aft thereof, a pair
spaced parallel straight tracks secured to the bottom of
with said superstructure straight tracks, ‘and plural revolu
ble bearing means interposed between each ?oor-supported
track and its associated superstructure track for support
ing said superstructure upon said ?oor supported tracks
for gliding movement therealong in opposite directions
from an at-rest position, said revoluble bearing means
being ‘free to move longitudinally of both tracks between
which it is disposed when said tracks move longitudinally
of ?oor-supported elongated tracks respectively disposed
beneath and in substantial vertical registry with said super
structure tracks, a pair of ball bearings spaced apart longi
tudinally of and interposed between each ?oor-supported
track and its associated superstructure track for support
ing said superstructure upon said ?oor-supported tracks
for gliding movement therealong in opposite directions
from an at-rest position, said ball bearings being ‘free to
move longitudinally of both tracks between which they
relative to each other, each of said ?oor-supported straight
tracks being formed with a pair of shallow depressions 35 are disposed when said tracks move longitudinally rela
tive to each other, each of said ?oor-supported tracks
therein spaced apart longitudinally along the track length
being formed with a pair of longitudinally spaced apart
within which ?rst and second portions of said plural rev
depressions therein with said pair of ball bearings dis
olulble bearing means are respectively disposed when the
posed respectively therein when the glider is in its normal
glider is in its normal at-rest position, each of said super
atdrest position, each of said superstructure tracks being
40
structure straight traclcs being formed with a pair of shal
formed with a pair of longitudinally spaced apart de
low depressions therein spaced apart longitudinally along
pressions therein positioned immediately above and in
the track length and positioned immediately above and in
facing relation to the pair of depressions in the below-lying
facing relation to the shallow depressions in the below
?oor-supported track so that said pair of ball bearings
lying ?oor-supported track so that said revoluble bearing
means are also disposed respectively therewithin when 45 are also disposed therewithin when the glider is in its
normal at-rest position, harness means carried by and
the glider is in its normal at-rest position, and harness
intercoupling
the pair of ball bearings disposed between
means intercoupling the spaced apart ?rst and second
each ?oor-supported track and its associated superstruc
portions of the plural revoluble bearing means disposed
ture track, said harness means shifting with said ball
between each floor-supported track and its associated
superstructure track, said harness means being carried by 50 bearings when the latter move longitudinally along said
tracks and including a pair of spaced apart top-ape-rt-ured
and shifting with said bearing means when the latter move
yokes respectively seated upon said pair of ball bearings
longitudinally along said tracks and including means to
so that the latter project partially upward through the
maintain substantially constant the spacing between the
associated yoke aperture vfor contact with the superstruc
intercoupled portions of the revoluble bearing means.
2. The combination according to claim 1 wherein said 55 ture track with the pair of yokes coupled to one another
by a rigid tie member extending therebetween, each of
?rst and second portions of said plural revoluble bearing
said yokes including a pair of arms extending downward
means each comprise a ball bearing, and wherein said
on opposite sides of said ?oor-supported track, said yoke
harness means intercoupling the spaced-apart ball bearings
comp-rises a pair of top-aperturedyokes respectively seated
arms turning inward toward one another and each under
upward through the associated yoke aperture for contact
with the superstructure track, said yokes being coupled to
more than a predetermined amount of vertical movement
upon said ball bearings so that the latter project partially 60 lying a portion of said ?oor-supported track to prevent
of each yoke relative to its associated track.
5. The combination comprising a superstructure includ
one another by :a rigid tie member extending therebetween.
ing a seat for an occupant, a double track assembly includ
3. The combination comprising a superstructure includ
65 ing a ?rst track adapted to rest on a supporting surface
ing a seat for an occupant, a double track assembly in
and a second track adapted for longitudinal movement
cluding a ?rst straight track adapted to rest on a support
relative to said ?rst track, said second track being parallel
ing surface and :a second straight track adapted for longi
to and spaced vertically above said ?rst track and being
tudinal movement relative to said ?rst straight track, said
second straight track being parallel to and spaced verti 70 nonengagingly underlyingly supported thereby through
an interposing pair of ball bearings spaced apart length
cally above said ?rst straight track and being non-engag
wise of said tracks, said ball bearings being longitudinal-1y
ingly underlyingly supported thereby through an inter
shiftable relative to both of said tracks and determining
posing pair of ball bearings spaced apart lengthwise of
the vertical spacing therebetween while maintaining said
said tracks, said ball bearings being longitudinally shift
able relative to both of said tracks and determining the 75 tracks in said vertically spaced parallel relation by re
3,098,678
7
8
stricting relative lateral movement therebetween, said
the said arms being apes-tilted and seated upon one of said
ball bearings so that the latter projects upward partially
through the yoke aperture into contact with the second
track, each ball bearing being thereby held captive be
superstructure being secured to said second traek for
movement therewith in fore and aft directions from an
at~rest position relative to said ?rst track, and a resiliently
idistendab‘le linkage, one part of said linkage being secured
tween the apertured portion of a yoke and the underlying
to said superstructure and second track assembly and
another part of said linkage being secured to said ?rst
track, whereby said'superstructure and said second track
?rst track.
References Cited in the ?le of this patent
assume the at-rest position relative to said ?rst track
when said linkage is in its minimum distended condition 10
Re. 25,239
‘and are biased toward the at-rest position when said link
667,967
age is distended beyond said minimum distended condition
UNITED STATES PATENTS
Pearlstine _______ __,____.. Sept. 11, 1962
Bunker ..__ ________ _--,____ Feb. 12, 1901
as a result of departure of said superstructure and second
‘1,366,625
Zoulek _______ __,_ _____ __ Jan. 25, 1921
track in either directionfrom the lat-rest position, said
spaced apart ball bearings being coupled together at a 15
?xed separation by harness means extending therebetween,
said harness means being partly disposed between said
?rs-t and second tracks and partly disposed in embracing
1,686,145
Cook ,__ _______________ __ Oct. 2, 1928
1,956,772
Morton _______ _,_i _____ __ May 1, 1934
2,191,644
2,336,433
2,579,599
Decker ______________ __ Feb. 27, 1940
Woina _________________ __ Dec. 7, 1943
Moroney ____________ __ Dec. 25, 1951
relation to said ?rst track, said harness means comprising
2,860,930
Schafranik ____,___,______ Nov. 18, 1958
a spaced apart pair of ‘generally C-shaped yokes inter
coupled by a rigid tie member extending therebetween,
the arms of each C-shaped yoke extending downward and
inward about said first track, and the yoke portion between
2,969,210
Pearlstine -__-u____..-____ __ Nov. 8, 1960
466,225
Great Britain _________ __ May 25, 1937
20v
FOREIGN PATENTS
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