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Патент USA US3096076

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July 2, 1963
GRANET ETAL
3,095,066
vmIcLE-SEAT SUSPENSION'
Filed Jan. 6, 1961
CHARLES GRANET
ROBERT CRAUC
WW"
'96E/vr
United States Patent O
Bßgëßöä
M
ICC
Patented July 2, 1963
l
2
3,096,066
Thus, it will be noted that the valve on the right-hand
piston :head 9 consists of a member #1K1 urged by a spring
VEHICLE-SEAT SUSPENSIUN
12 against the seat `formed by the head 9 so as to close
Charles Granat, 32 Blvd. de Lorraine, Courbevoie,
the central passage or channel 9a of relatively large cross
France, and Robert Crauc, 2 Ave. Louis Dardenne, 5 sectional area. A leakage path is created by an orifice 11a
Vanves, France
of relatively small diameter in valve member 11. The
Filed Jan. 6, 1961, Ser. No. 81,136
valve assembly on the left-hand piston head 8 comprises
Claims priority, application France Nov. 30, 1960
a member l‘1-3 pressed by a spring -14 against the seat
6 Claims. (Cl. 248-399)
formed by the head 8 in order to close the central pas
This invention relates to suspension systems of vehicle 10 sage lor channel 8a of relatively large cross-sectional area,
but this member 13 is formed with a central bore slid
seats, notably for vehicles operated under jolting condi
ably penetrated by the stem 15a of a valve having its
tions, such as road or farming tractors, harvesters, reap
head 15 adapted to close this bore under the influence
ers and other agricultural machines, and in general any
of a spring 16. The valve stem 15a is formed with a
vehicles for public or farming works which subject their
drivers and passengers to relatively strong Vibration, jolt 15 blind axial hole 15e communicating with a radial oriñce
or port 15b, the latter being normally blocked by the sur
ing 4or shaking.
rounding valve member 13.
With the suspension system of this invention it is possi
It is clear that the orifice 11a will Iretard the flow of
ble not only to provide a satisfactory comfort to the
seated person but also to raise the seat and to hold same
in this raised position.
hydraulic fluid in the manner of a dashpot whenever the
20 crank arm 7 and ltherefore the seat support 1 are
This system is particularly useful in the case of vehicles
oscillated.
When the seat is raised manually to the position shown
without a body, with a View to preventing rainwater from
in chain-dotted lines in FIG. 1, it would return to the
stagnating on the seat.
normal or operative position (full lines) if the valve 13
This suspension system comprises a seat support re
siliently connected to a suitable portion of the vehicle 25 were designated like the valve 1'1 since in this case the
structure, the support being pivoted on said vehicle por
tion through the medium of a double-acting hydraulic
shock absorber having two channeled piston heads with a
ñuid would flow through a permanently open leakage
passage such as oriñce 11a. By virtue of the substitution
of a valve member 13, in the head 8, for this valve 11,
the =oil cannot flow through this member in the direction
as to produce different braking actions according to the 30 from lef-t to right corresponding to a lowering of the
seat support 1, unless the Áforce tending to lower the arm
direction in which the shock-absorbed arm is moved by
2 is capable of u-nseating the valve 15. As the weight
an external Iforce.
of the seat is not suñicient to obtain this effect, the raised
Other specific features and advantages of this inven
seat cannot lower itself unless it is forced to do so by
tion will become apparent as the `following description
pair of diiîerently calibrated, oppositely acting valves so
proceeds with reference to the accompanying drawing il 35 a load or an impact of such magnitude that the counter
acting pressure of cushioning spring 5 is overbalanced to
lustrating diagrammatically by way of example a typical
embodiment of the invention, it being understood that
changes in the precise embodiment of the invention herein
a degree which will develop across the head 8 a pressure
disclosed may be made within the scope 'of what is
ly, the seat-‘lowering force capable of having this effect
differential large -enough to open the valve 15. Evident
claimed without departing from the spirit of the inven 40 will have to be considerably greater than a seat-raising
force adapted to the valve 1‘3, in View of the difference
tion.
In the drawing:
,
between the effective surface areas of the two valves 13,
y15. It should lbe observed, furthermore, that whereas
pension according to this invention (the chain-dotted 45 valve 13 upon opening will let the ñuid flow relatively
freely through passage 8a, a yielding of valve v15 will per
lines showing the seat in its raised position); and
FIG. l is a diagrammatical view showing a seat sus
mit only a restricted flow since the ñuid must always pass
FIG. 2 is an axial section showing on a larger scale
through the narrow port 15b.
the shock absorber utilized for the purposes speciiied.
Of course, many modiñcations and variations may be
As shown in FIG. 1, the suspension comprises a sup
port 1 for a seat (not shown) which is rigid with the arm 50 brought to the embodiment shown and described herein
without departing from the spirit and scope of the inven
2 of a shock absorber 3 secured on a base portion 4 of the
tion as set forth in the appended claims.
vehicle structure (or on an intermediate plate secured in
What we claim is:
turn on this portion), and a resilient member, shown by
1. A seating `assembly for a vehicle subject to jolting,
way of example as a helical compression spring 5, dis
posed between the support 1 and base portion 4. Pref 55 comprising a base; a seat support mounted on said base
for pivotal movement about a horizontal axis; resilient
erably, this spring 5 is adjustable by having one end
anchored on a slide 1a adapted to be set in different
means 4anchored to said base and to said seat support for
longitudinal positions, this slide being adjustable with
counteracting the weight of the latter; hydraulic damp
ing means -on `said base, said damping means including a
respect to the support -1.
The shock absorbed shown in FIG. 2 comprises in the 60 piston cylinder and piston means axially slidable in said
cylinder; and transmission means positively connecting
conventional manner a body 3, a shaft 6 being journaled
said seat support with said piston means; said piston
across said body and rotatably solid on the one hand with
means comprising a pair of axially spaced heads forming
an external arm 2 and on the other hand with the inner
channels for the passage of a hydraulic fluid in gen
crank arm 7 engaging with its projecting end 7a the heads
8 and 9 of a two-headed piston 10, respectively. The 65 erally axial direction within said cylinder, a first valve
body 3 is integral with a cylinder 18 ñlled with hydraulic
on one of said heads spring-urged into a normal position
blocking the passage of said Huid in one axial direction
ñuid, for example oil fof the type usually employed in
while being yieldable to a predetermined lìuid pressure
shock absorbers, this cylinder has an upper central aper
ture 19 for the passage of the lever arm 7.
in lthe ‘opposite axial direction, said one of said heads
The shock absorber illustrated in FIG. 2 comprises 70 being provided with an orifice of a width unatîected by
the position of the said iirst valve and independent of the
flow-control devices having different characteristics ac
pressure differential across said orifice for enabling the
cording to the type of piston head considered.
3,096,056
passage of a restricted fluid -lioW therethrough, a second
valve on the other of said heads spring-urged into a nor
mal position blocking the passage of said ñuid in said
opposite axial direction While being yieldable to a pre
passage of said fluid in said one direction through said
bore While being yieldable to a predetermined fluid pres
sure in said opposite direction, said third valve being pro
vided With a port obstructed in its normal position and
determined -ñuid pressure in said one direction, and a
third valve on said other of said heads spring-urged into
a normal position blocking the passage of said ñuid in
said one direction While being yieldable to a predeter
exposed upon yielding for permitting only a restricted
iiow of said fluid through said bore in said opposite direc
mined iluid pressure in said opposite direction, said third
valve being provided with a port obstructed in its normal
position and exposed upon yielding for permitting only a
restricted ilow :of said ñuid through said other of said
heads in said opposite direction.
comprising a ibase; a seat support mounted on said base
2. A seating assembly for a vehicle subject to jolting,
comprising Va base; a seat support mounted on said base
for pivotal movement about a horizontal axis; resilient
means anchored to said base and to said seat support
lfor counteracting the lweight of the latter; hydraulic
damping means on said base, said damping means includ
ing a piston cylinder and a piston axially slidable in said
cylinder; »and transmission means positively connecting
said seat support with said piston means; said piston
being provided with =a pair of axially aligned heads form
sing channels for the passage of a hydraulic ñuid in gen
erally axial ldirection Within said cylinder, a iirst valve
on one of said heads spring-urged into a normal position
blocking rthe passage of said Aìluid in one axial direction
While being yieldable to a predetermined duid pressure
tion.
4. A seating assembly for a vehicle subject to jolting,
for pivotal movement about a horizontal axis; resilient _
means anchored to said base and to said seat support for
counteracting the Weight of the latter; hydraulic damping
means on said base, said damping means including a pis
ton Iclinder and a piston axially slidable in said cylinder;
`and transmission means positively connecting said seat
support with said piston means; said piston being provided
With a pair of axially «aligned heads each formed w-ith a
respective channel for the passage of a hydraulic iiuid in
generally axial direction Within said cylinder, a ñrst valve
20 on one of said heads spring-urged into a normal position
blocking the passage of said iluid in one axial direction
through said :channel thereof While being yieldable to a
predetermined fluid pressure in the opposite axial direc
tion responsive to a relatively small seat-lowering force,
said ñrst valve being provided with an oriñce of a width
nnaíîected by the position of said iirst valve and inde
pendent of the pressure differential across said orifice for
enabling the passage of a restricted fluid flow there
through, a second valve on the other of said heads spring
Small seat-lowering force, ysaid one of said heads being 30 urged into a normal position blocking the passage of said
ñuid in said opposite axial direction through said chan
provided with an orifice of a Width unaffected by the
in the opposite axial direction responsive to a relatively
position of said first valve and independent of the pressure
differential across said orifice for enabling the passage
nel thereof While being yieldable to a predetermned fluid
pressure in said one direction responsve to a relative small
seat-raising force, said second valve being formed With a
of a restricted ñuid tiow therethrough, a second valve
on the other of said heads spring-urged into a normal 35 substantially axially extending throughgoing bore, and
la third valve on said second valve spring-urged into a
position blocking the passage «of said ñuid in said opposite
normal position blocking the passage of said duid in said
one direction through said bore Whle being yieldable to
a predetermned ñuid pressure in said opposite direc-tion re
tively small seat-raising force, and a lthird valve on said
other of said heads spring-urged into a normal position ' 40 sponsive to a relatively large seat-lowering force, said
third valve being provided with a port obstructed in its
blocking the passage of said ñuid in said one direction
nor-mal position `and exposed upon yielding for permitting
while being yieldable to va predetermined ñuid pressure
only a restricted ñow of said fluid through said bore
in said opposite direction responsive to a relatively large
in said opposite direction.
seat-lowering force, said third valve being provided with
5. A seating assembly for a vehicle subject to jolting
a port obstructed in its normal position and exposed upon
axial direction While being yieldable to a predetermined
¿duid pressure in said one direction responsive to a rela
yielding for permitting only'a restricted ñ‘ow of said fluid
through said other of said heads in said opposite direc
comprising a base; a seat support mounted on said base
tion.
oounteracting the Weight of the latter; hydraulic damping
3. A seating’ assembly for a vehicle subject to jolting,
for pivotal movement about a horizontal axis; resilient
means anchored `to said base and to said seat support for
`comprising a base; ~a seat support mounted on said base 50 means on said base, said damping means including a pis
ton ycylinder and piston means `axially slidable in said
for pivotal movement about a horizontal axis; resilient
means anchored to said base and to said seat support for
counter-acting the weight of the latter; hydraulic damp
ing means :on said base, said ‘damping means including a
cylinder; and transmission means opsitively connecting
said seat support with said piston means; said piston means
comprising a pair of axially spaced heads each formed
cylinder; and transmission means positively connecting
with a respective channel for the passage of a hydraulic
clîluiclY in generally axial direction within said cylinder, a
said sea-t support with said piston means; said piston
means comprising a pair of axially spaced heads each
position blocking the passage of said Ifluid in one axial
piston cylinder vand piston means axially slidable in said
formed With .a respective channel for the passage of la
ñrst valve on one of said heads spring-urged into a normal
direction through said channel thereof while being yield
able to a predetermined liu-id pressure in the opposite
cylinder, -a ’first valve on one of said heads spring-urged 60 `axial direction, said first valve being provided with an
orifice of a width unatÍected fby the position of ,said first
into a normal position blocking the passage of said 4fluid in
v-alve and independent of the pressure differential across
one axial direction through said channel thereof while
said
oriiice for enabling the passage of a restricted fluid
ibeingvyieldable to a predetermined fluid pressure in the
hydraulic fluid in generally axial direction within said
opposite axial direction, said first valve being provided
flow therethrough, a sec-ond valve on the other of said
heads spring-urged into a normal position blocking the
passage of said llluidl »in said opposite axial direction
through said channel thereof while being yieldable to a
predetermined -fluid pressure in siad one direction, said
second valve being formed with a substantially axially
said heads spring-urged into a normal position blocking
the passage of said fluid in said opposite axial direction 70 extending throughgoing bore, rand a third valve on said
second valve spring-urged into a normal position block
through said channel thereof while being yieldable to a
«ing the passage of said fluid in said one direction through
predetermined Iiìuid pressure in said sone direction, said
said bore while being yieldable to a predetermined fluid
second valve being formed with a substantially axially ex
pressure in said opposite direction, said third valve being
tending throughgoing bore, Iand a third valve on said sec
ond valve spring-urged into -a normal position blocking the 75 provided with a stem slidably received in said bore and
with an oriñce of a Width unaffected by the position of said
4iirst-valve and independent ofY the pressure diiîerential
across said yoriiice for enabling the passage of a restricted
ñuid ñow therethrough, a second valve on the other of
3,096,066
with an upper aperture at an intermediate axial location,
said transmission means including a lever arm extending
into said cylinder ythrough said aperture and engaging said 10
piston Ibetween said heads.
FOREIGN PATENTS
1,033,124
France ______________ __ Apr. 1, 1953
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