close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3031174

код для вставки
April 24, 1962
K, SCHOPF
3,031,164
SHOCK ABSORBING ARRANGEMENT FOR TRACTOR SEATS AND THE LIKE
Filed Jan. 19, 1961
Fig.7
2 Sheets-Sheet 1
/7
80
710
‘his Arron/v6)’
April 24, 1962
K. SCHOPF
3,031,154
SHOCK ABSORBING ARRANGEMENT FOR TRACTOR SEATS AND THE LIKE
Filed Jan. 19 , 1961
2 Sheets-Sheet 2
Y
mam/M
United States Patent 5
M6
~
3,031,164
Patented Apr. 24, 1962
1
2
3,031,164
tem which directly supports the load, in the speci?c con
struction of the automatic adjusting mechanism for the
tensioning member, and in the speci?c mounting of the
SHOCK ABSORBING ARRANGEMENT FOR
TRACTOR SEATS AND THE LIKE
Karl Schopf, Grosshelfendorf, near Munich, Germany,
biasing means so that this biasing means may be sub
jected to an increased tension by selectively twisting either
assignor to Georg Fritzmeier, K.G., Grosshelfendorf,
one of its end portions with respect to the other end
near Munich, Germany
Filed Jan. 19, 1961, Ser. No. 83,758
Claims priority, application Germany Jan. 21, 1960
17 Claims. (Cl. 248-373)
portion.
The novel features which are considered as character
istic of the invention are set forth in particular in the
10 appended claims. The invention itself, however, both as
The present invention relates to a mechanical shock
absorbing arrangement for cushioning the movements of
a load, and more particularly to a shock absorbing ar
rangement which is especially suited for cushioning the
driver’s seat in a tractor or another automotive vehicle. 15
It is already known to support the seat of a tractor or
another conveyance by resilient means whose tension and
resistance to the descent of the seat under the weight of
the driver’s body increase proportionally with de?ection
to its construction and its method of operation, together
with additional objects and advantages thereof, will be
best understood from the following detailed description
of a speci?c embodiment when read in connection with
the accompanying drawings, in which:
FIG. 1 is a side elevational view of the mechanical
shock absorbing arrangement as utilized for cushioning
a load in the form of a seat for a tractor or a like con
veyance,.the parallel motion system which directly sup
of the seat from its normal position. A serious draw 20 ports the seat being shown in two different positions re
spectively indicated in full and phantom lines;
back of such prior arrangements is that the tension of
FIG. 2 is an end elevational view of the shock absorb
the resilient means cannot be adjusted at will and that
ing arrangement as seen in the direction of arrows from
the means for adjusting the tension is not readily acces
the line 11-11 of FIG. 1, certain parts being‘ partially‘
sible to the driver when the conveyance is in motion.
Accordingly, it is an important object of the present 25 broken away for the sake of clarity;
FIG. 3 is an enlarged fragmentary side elevational
invention to provide a shock absorbing arrangement for
view of the manual adjusting mechanism which forms a‘
the seat of an automotive vehicle which is constructed
component part of the shock absorbing arrangement, a
and assembled in such a Way that it may be rapidly and
different position of this adjusting mechanism being shown
conveniently adjusted by a person occupying the seat,
which is of very simple and rugged construction, which 30 in phantom lines; and
PEG. 4 is an enlarged fragmentary side elevational
is reliable in operation, and which is capable of provid
view of the manual adjusting mechanism in the position it
ing an in?nite number of adjustments such as will bring
assumes prior to the actuation of the automatic adjusting
about optimum cushioning effect necessary to meet the
mechanism, the changed position of the manual and auto
conditions of the terrain on which the vehicle travels.
Another object of the invention is to provide a shock 35 matic adjusting mechanisms being shown in phantom
lines.
absorbing arrangement of the just outlined characteristics
Referring now in greater detail to the drawings, and
which is adjustable by hand or in a fully automatic way
first to FIG. 1, there is shown a mechanical shock ab
so as to insure that the person occupying the seat is not
subjected to a sudden shock such as could cause said
person to lose control of the vehicle or to be uncom
fortable in the seat.
sorbing arrangement for a load in the form of a tractor
seat 1, the arrangement comprising a parallel motion sys
tem including a vertical clamp 3 which adjustably receives
the downwardly extending vertical shaft 2 of the seat 1
A further object of the instant invention is to provide
a ?rst link 5 whose upper end is connected to the clamp
a shock absorbing arrangement of the above described
3 by a pivot pin 4, a second link 7 whose upper end is
type which may be readily installed in many types of
automotive vehicles, which is of very compact and hence 45 connected to the clamp 3 by a second pivot pin 6 located
at a level below the pin’ 4, and means de?ning two
space-saving design, which can be adjusted in a very
parallel pivot axes for the lower ends of the links 5 and
simple way, and which is capable of withstanding very
7. The link v5 actually supports the seat 1, and the lower
high stresses such as may arise when the vehicle travels
link 7 serves as a means for maintaining the shaft 2 in
on rough terrain or when the resilient component of the
shock absorbing arrangement is subjected to very high 50 vertical position. The parallel motion system is carried
loads.
With the above objects in view, the invention resides
by supporting means in the form of a base plate 12 which
constitutes a component part of the tractor frame and '
rangement which, in its elementary form, comprises elon
carries a lug or bracket 9 which pivotally supports the
lower end of the link 7 by means of a pin 10, the axis of
tractor or another load supporting means and with one ‘
a rotary member in the form of a horizontal tube 8, best
in the provision of a mechanical shock absorbing ar
gated biasing means preferably assuming the form of a 55 this pin constituting the pivot axis for the lower end
of the link 7. The lower end of the link 5 is welded .
package consisting of a plurality of ribbon torsion springs,
or otherwise rigidly secured to and extends radially from
load transmitting means connected with the seat of a
shown in FIG. 2, the reinforced right-hand end 8a of this
end portion of the biasing means, and tension adjusting
means preferably comprising a tensioning lever connected 60 tube being rotatably received in a bearing bracket 13
with the other end portion of the biasing means. This _ which is connected to the base plate 12 by one or more
bolts 13a. The other end 8b of the tube 8 rotatably
lever may be pivoted manually, by remote control or, in
receives the boss 14 provided at one end of a tensioning
accordance with an important feature of my invention,
member in the form of a one-armed lever 19, the boss 7
in a fully automatic way in dependency on the movement
of the load from its normal position, so as to increase 65 14 being also rotatable in a bearing bracket 18 which is
welded ‘to the base plate 12. Thus, the common axis
the tension of the biasing means and to counteract with a
greater force or to fully prevent further de?ection of the
load.
Certain other features of the invention reside in the
of the tube 8, of the bearing brackets 13, 18 and of the
boss 14 constitutes the pivot axis for the lower end of
the link 5.,
j
provision of a speci?c manually operable pivoting and 70 The right-hand end 8a of the tube 8 is formed with a
non-circular (e.g. rectangular) bore 15 which receives the I
adjusting mechanism for the tensioning member, in the
' right-hand end portion 11a of a biasing means in the form
provision of a specially constructed parallel motion sys
3,031,164
of a laminated package 11 composed of a number of
ribbon torsion springs. The end portion 11a is thus direct
ly connected with the parallel motion system and takes
up the entire load carried by and including the seat 1.
The tube 8 constitutes a means for transmitting the load
to the end portion 11a of the biasing means. The other
end portion 11b of the biasing means 11 is received in
4
tom-line position 19’ and to twist the biasing means 11
to the position 11’. In such position 11' of the biasing
means 11, the load including the seat 1 must be increased
substantially in order to cause a pivotal movement of the
links 5 and 7 in clockwise direction. The driver operates
the cam lever 23 when he desires to adjust the tension of
the non-circular bore 17 formed in the boss 14 of the lever
19. A headless radial screw 16 extends into the bore 15
and prevents axial displacements of the biasing means 11
with respect to the tube 8.
the biasing means 11 to his own Weight or to change the
tension while the conveyance moves from uneven onto
smoother terrain, or vice versa. Of course, the lever 23'
may assume any desired number of intermediate posi
. The biasing means 11 tends to maintain the seat 1 in
to the cam 24 and to thereby bring about corresponding
tions to move the shaft 21 to a given position with respect
the position of FIG. 1 by forcing the tube 8 to assume
angular displacements of the tensioning lever 19. As
an angular position corresponding to av fully untwisted
hereinabove, the link 7 may come into abut
position of the ribbon torsion springs which together form 15 mentioned
ment with the tube 8 so as to prevent a raising of the
the biasing means 11, i.e. the springs are disposed in paral
seat 1 when the driver pivots the cam lever 23 in anti
lel planes if the tube 8 is free to follow the bias of the
clockwise direction in order to increase the tension of the
package 11. In the end position of the seat 1 as shown in
biasing means 11.
FIG. 1, the link 7 abuts against the tube 8 and thus pre
FIG. 4 illustrates in greater detail an automatic pivot
vents further anticlockwise movement of the link 5. about 20 ing mechanism for the lever 19 for adjusting the tension
the axis of the rotary tube 8. In other words, the link 7
of the biasing means 11 which becomes operative in re
actually constitutes a stop for the pivotal movement of
sponse to a predetermined initial load upon the end por
the link 5 in one (anticlockwise) direction. Such a stop
tion 110, i.e. in response to a predetermined rotary move
is; necessary in order to insure that the seat 1 does not
ment of the tube 8 and of the link 5 in clockwise direc
change its position when the driver desires to increase the 25 tion, as viewed in FIG. 4. Such rotary movement of the
tension of the biasing means 11. The bias of the ribbon
tube 8 causes a twisting of the end portion 11a with re
torsion springs constituting the biasing means 11 may be
spect to the end portion 11b in a sense to increase the
increased by a manually actuatable cam lever 23 which is
tension of the biasing means. As shown, the plate cam
pivotally connected to the free end of the tensioning lever
24 forms» one arm of a rockable bell crank lever whose
19. and carries a shaft 21 which is connected to an eccen 30
other arm 27 is in the path of and is rockable by a pro
tric cam follower 22 whose arcuate face 22a engages with
jection 28 carried by the tube 8 so that, when the tube
a- ?at cam 24. The shaft 21 is rotatably received in a
8 rotates in clockwise direction to an extent necessary to
bearing sleeve 20 which is connected to the free end of the
move the link 5 to the phantom-line position 5", the pro
lever 19. The con?guration of the arcuate cam face 22a
jection 28 engages the arm 27 and rocks the bell crank
is such that the follower 22 causes an anticlockwise pivotal
lever 24, 27 about a pivot pin 26 which, as shown in
movement of the tensioning lever 19 when the cam lever
23 is swung by hand or by remote control in anticlockwise
direction indicated by the arrow A. This causes a twist
ing and resultant tensioning of the biasing means 11 in a
FIG. 2, is connected to the bearing bracket 18. As soon
as the projection 28 assumes the position 28" and engages
the arm 27 to de?ect the latter to the position 27", the
arm 24 assumes the position 24" and causes the tension
direction to urge the link 7 with a greater force against the 40
tube 8 so that a greater force is necessary’ to cause a des
cent of- the seat 1 to a position‘ in which the clamp 3, the
link 5 and the link 7 respectively assume the phantom
line. positions indicated by, reference numerals 3’, 5' and
7". The ?at plate cam 24 normally abuts against the end
face 25 of the base plate 12. The means for manually
pivoting the cam lever 23 from the position of FIG. 1 in
the direction of the arrow A comprises a handgrip mem
ing lever 19 to assume the position 19" without requiring
any angular displacement of the manually operable cam
lever 23, i.e. without requiring any actuation of the pivot
ing means 22-24 for the lever 19. The lever 23 then
moves in parallelism with itself and assumes a position
corresponding to the phantom-line position 22" of the
cam follower 22. The pivotal movement of the tension
ing lever 19 (to the position 19") increases the tension
of the biasing means 11 (see the position 11") so that the
ber in the form of a knob 23a which is preferably within
latter resists with a greater force the descent of the link
reach of the driver’s hand. Of course, it will be readily 50 5 beyond the position 5". In other words, the shock ab
understood that the cam lever 23 may be pivoted by a
sorbing arrangement now counteracts with a greater force
remote control mechanism of any suitable design, e.g. by
the load carried by and including the seat 1 to prevent a
a link train, particularly in the event that‘ this lever is
strong impact of the link 7 against the base plate 12 or an
rather distant from the seat 1.
When the load upon the end portion 11a is reduced, 55 excessive lowering of the seat 1 such as would be uncom
fortable to the driver when the manual adjusting mecha~
i.e. when the driver rises from the seat 1, the parallel‘
nism is in a position as shown in full lines in FIG. 3.
motion system including the clamp 3 and the links 5, 7
'As soon as the downwardly acting force upon the seat
immediately returns to the full-line position of FIG. 1
1 isv reduced, the link 5 begins to pivot in anticlockwise
under the action of the biasing means 11 which tends to
direction so that the projection 28 moves away from the
rotate the tube 8 until the latter comes into abutment with
the link 7. By adjusting the angular position of the ten
sioning lever 19, the driver can adjust the cushioning effect
of} the shock absorbing arrangement because any angular
displacements of the lever 23 in anticlockwise direction
(arrow A) will reduce the cushioning action so that the
arm 27 and‘ the automatic bias or tension adjusting mech
anism 27, 23 is inactivated, ie. the tension of the biasing
means 11 is reduced when the seat 1- moves toward its
normal position of FIG. 1.
Of course, the cam face 22a of the follower 22 need
65 not, necessarily assume an arcuate (convex) shape but
seat 1 is not likely to vibrate when the tractor travels on
may be of polygonal or other contour as long as it insures
slightly uneven terrain but the seat will descend in re
that the tension of the biasing means 11 increases by a
sponse to substantial shocks such as could be unpleasant
twisting of the end portion 11b with respect to the end
to‘ the driver.
FIG. 3 shows the manually adjustable cam lever 23 in 70 portion 11a when the tensioning lever 19 is pivoted in a
given direction (arrow A). The other face 22b of the
the end‘ position of FIG. 1 (fullrlines) as well as in a
cam follower 22 is but need not always be flat. This face
phantom-line second end position 23' assumed by this
22b does not move into-contact with the plate cam 24.
lever when the biasing, means 11 is under maximum initial
The automatic tension adjusting mechanism 27, 28 for
tension. It will be noted that the tensioning lever 19 then
the biasing means 11 actually constitutes a releasable
also pivots in anticlockwise direction to assume the phan
couplingv for adjusting the tensioning lever 19 and for
spatter
.
5
.
v
V
7
thereby changing the relative position of the cam and fol
of said one end portion with respect to said other end‘
lower assembly 22, 24 in a sense to further increase the
portion in a direction to increase the tension of said bias
ing means, said second tension adjusting means compris
tension of the biasing means 11 without changing the
position of the cam lever 23. In other words, the man
ing means for adjusting said tensioning member so as to
further increase the tension of said biasing means in‘
response to said predetermined twisting of said one end
ually operable adjusting mechanism including the tension
ing lever 19 and its pivoting means acts against and is
portion with respect to said other end portion.
3. A mechanical shock absorbing arrangement for
adapted to twist the end portion 11b of the biasing means
11 with respect to the end portion 11a, while the auto
matic adjusting mechanism 27, 28 responds to a pre
cushioning the movements of a load, said arrangement
determined movement of the load transmitting means, 10 comprising, in combination, elongated biasing means of
the ribbon torsion spring type, said biasing means having
i.e., to a predetermined twisting of the end portion ‘11a
a ?rst and a second end portion; load transmitting means
with respect to the end portion 11b because the end
comprising a rotary member connected with one of said
portion 11a is connected with the tube 8 which consti
end portions; ?rst tension adjusting means comprising a
tutes the load transmitting means and rocks the arm 27
through the projection 28.
15 pivotable tensioning member connected with the other
It will be noted that the projection 28 widens gradually
in a direction radially away from the periphery of the
end portion and pivoting means operatively connected
with said tensioning member for pivoting the same in
directions to twist and untwist said other end portion
rotary tube 8 so that the automatic tensioning of the
with respect to said one end portion and to thereby re
biasing means 11 increases proportionally with the extent
to which the seat 1 descends from its normal position. 20 spectively increase and reduce the tension of said biasing
means; and second tension adjusting means responsive to
Such con?guration of the projection 28 insures that the
a predetermined rotary movement of said rotary mem
resistance of the biasing means 11 increases gradually and
reaches its maximum magnitude when the angular dis
her in a direction to twist said one end portion with
respect to said other end portion and to thereby increase
placement of the links 5 and 7 teaches an undesirable or
even dangerous value, i.e. a value at which the means 25 the tension of said biasing means, said second adjusting
means comprising means operatively connected with said
which supports the seat 1 or the seat itself is likely to hit
pivoting means for adjusting said tensioning member so
against an obstruction such as could impart a shock to
as to further increase the tension of said biasing means
the driver. However, since the projection 28 is normally
at least slightly spaced from the arm 27, the seat 1 is free
in response to said predetermined rotary movement of
,
to vibrate in response to lesser shocks without causing a 30 said rotary member.
4. A mechanical shock absorbing arrangement for
change in the tension of the biasing means 11. This is
cushioning the movements of a load, said arrangement
advisable because a softly cushioned seat is more com
fortable to the driver in normal operation of the con
comprising, in combination, elongated biasing means of
veyance, namely, when the surface on which the con~
the ribbon torsion spring type, said biasing means having.
vevance travels is reasonably smooth.
35 a ?rst and a second end portion; load transmitting means
Without further analysis, the foregoing will so fully
comprising a rotary member connected with one of said
reveal the gist of the present invention that others can,
end portions; ?rst tension adjusting means comprisingfa ,
by applying current knowledge, readily adapt it for various
pivotable tensioning member connected with the other ‘
applications without omitting features that, from the
end portion and pivoting means operatively connected ,
standpoint of prior art, fairly constitute essential char 40 with said tensioning member for pivoting the same in di
acteristics of the generic and speci?c aspects of this in
rections to twist and untwist said other end portion with \
vention, and, therefore, such adaptations should and are
respect to said one end portion and to thereby respective~
intended to be comprehended within the meaning and
1y increase and reduce the tension of said biasing means;
range of equivalence of the following claims.
and second tension adjusting means responsive to a pre
What is claimed as new and desired to be secured by 45 determined rotary movement of said rotary member in
letters Patent is:
a direction to twist said one end portion with respect to
l. A shock absorbing arrangement for cushioning the
movements of a load, said arrangement comprising, in
combination, elongated biasing means of the torsion
spring type, said biasing means having a ?rst and a sec
mtd end portion; load transmitting means connected
with one of said end portions; ?rst tension adjusting means
comprising a tensioning member connected with the
said other end portion and to thereby increase the ten
sion of said biasing means, said second adjusting means
consisting of a projection connected with said rotary mern~ 1.
her and a rockable arm located in the path of said projec- ,
tron and operatively connected with said pivotingmeans 1
for adjusting said tensioning member so as to further in
crease the tension of said biasing means when engaged
and rocked by said projection in response to, said pre- ;
other end portion and adapted to twist said other end
portion with respect to said one end portion for increasing
determined rotary movement of said rotary member.
the tension of said biasing means; and second tension 55
5. A mechanical shock absorbing arrangement for I
adjusting means responsive to the twisting of said one
cushioning the movements of a load, said arrangement '
end portion'with respect to said other end portion in a
comprising, in combination, elongated biasing means of _
direction to increase the tension of said biasing means,
the ribbon torsion springtype, said biasing means having '
said second tension adjusting means comprising means
a ?rst and a second end portion; load transmitting means
for adjusting said tensioning member so as to further in 60 comprising a rotary member connected with one of said
crease the tension of said biasing means in response to
end portions; ?rst tension adjusting means comprising a :
the twisting of said one end portion with respect to said
pivotable tensioning member. connected with the other
other end portion.
end portion and pivoting means operatively connected
2. A shock absorbing arrangement for cushioning the
65 with said tensioning member for pivoting the same in di
movements of a load, said arrangement comprising, in
rections to twist and untwist said other end portion with
combination, elongated biasing means of the torsion '
respect to said one end portion to thereby respectively in
spring type, said biasing means having a ?rst and a sec
crease and reduce the tension of said biasing means, said
ond end portion; load transmitting means connected
pivoting means comprising a cam lever rotatably con- '
with one of said end portions; ?rst tension adjusting means 70 nected with said tensioning member, a cam follower con~
comprising a tensioning member connected with the
nected to and rotatable with said lever, a rockable ?rst ‘
other end portion and adapted to twist saidother end '
portion with respect to said one end portion for increasing '
the tension of said biasing means; and second tension
armcooperating with said follower for pivoting said ten- ‘
sioning member in response to rotation of said cam lever,
and abutment means for said first arm; and a second ten- '
adjusting means responsive to a predetermined twisting 75 sion adjusting means responsive to a predetermined rotary
3,031,164
8
movement of said rotary member in a direction to twist
said. one end portion with respect to said other end por
tion and to thereby increase the tension of said biasing
means, said second adjusting means comprising a projec
tion connected to and rotatable with said rotary member,
and a second arm connected with said ?rst arm for rock
ing said ?rst arm and for thereby adjusting said tension
receiving said biasing means and non-rotatably connected
with one of said end portions, and seat-supporting link
means rigidly connected with said tube; ?rst tension ad
justing means comprising a pivotable tensioning member
connected with the other end portion and pivoting means
operatively connected with said tensioning member for
pivoting the same in directions to twist and untwist said
other end portion with respect to said one end portion
and to thereby respectively increase and reduce the ten
sion of said biasing means; and second tension adjusting
ing member so as to further increase the tension of said
biasing means when engaged and rocked by said projec
tion in response to said predetermined rotary movement
of said rotary member.
means responsive to a predetermined rotary movement
of said tube in a direction to twist said one end portion
‘6. A mechanical shock absorbing arrangement for
cushioning the movements of a load, said arrangement
with respect to said other end portion and to thereby
comprising, in combination, elongated biasing means of
increase the tension of said biasing means, said second ad
the ribbon torsion spring type, said biasing means having 15 justing means comprising a projection connected with said
a ?rst and a second end portion; load transmitting means
comprising a rotary member connected with one of said
end portions; ?rst tension adjusting means comprising a
tube and a rockable arm located in the path of said pro
jection and operatively connected with said pivoting
means for adjusting said tensioning member so as to fur
pivotable tensioning member connected with the other
ther increase the tension of said biasing means when
end portion and pivoting means operatively connected 20 rocked by said projection in response to said predeter
with said tensioning member for pivoting the same in di
rections to twist and untwist said other end portion with
respect to said one end portion and to thereby respec
mined rotary movement of said tube.
tively increase and reduce the tension of said biasing
rangement comprising, in combination, elongated biasing
9. A shock absorbing arrangement for cushioning the
movements of a seat for tractors and the like, said ar
means, said pivoting means comprising a cam lever ro
25 means of the ribbon torsion spring type, said biasing
tatably connected with said tensioning member, a cam
means having a ?rst and a second end portion; load trans
follower connected to and rotatable with said lever, a
mitting means comprising a rotary tube at least partially
rockable ?rst arm cooperating with said follower for piv
oting said tensioning member in response to rotation of
receiving said biasing means and non-rotatably connected
with one of said end portions, and a seat-supporting paral
said cam lever, and abutment means for said ?rst arm; 30 lel motion system including link means rigidly connected
and second tension adjusting means responsive to a pre
with said tube; ?rst tension adjusting means comprising a
determined rotary movement of said rotary member in a
pivotable tensioning member connected with the other end
direction to twist said one end portion with respect to
portion and pivoting means operatively connected with
said other end portion and to thereby increase the ten
said tensioning member for pivoting the same in direc
sion of said biasing means, said second adjusting means 35 tions to twist and untwist said other end portion with
comprising a projection connected to and rotatable with
respect to said one end portion and to thereby respec~
said rotary member, and a second arm connected with
tively increase and reduce the tension of said biasing
said ?rst arm for rocking said ?rst arm and ‘for thereby
adjusting said tensioning member so as to further increase
means; and second tension adjusting means responsive to
a predetermined rotary movement of said tube in a direc
the tension of said biasing means when engaged and 40 tion to twist said one end portion with respect to said
rocked by said projection in response to said predeter
other end portion and‘ to thereby increase the tension of
mined rotary movement of said rotary member, said arms
said biasing means, said second adjusting means com
together constituting a bell- crank lever.
prising a projection connected with said tube and a rock
7. A mechanical shock absorbing arrangement for
able arm located in the path of said projection and opera
cushioning the movements of a load, said arrangement 45 tively‘ connected with said pivoting means for adjusting
comprising, in combination, elongated biasing means of
said tensioning member so as to further increase the ten
the ribbon torsion spring type, said biasing means having
sion of said biasing means when rocked by said projection
in response to said predetermined rotary movement of
said tube.
a ?rst and a second end portion; load transmitting means
comprising a rotary tube at least partially receiving said
biasing means and non-rotatably connected with one of 50
said end portions; ?rst tension adjusting means compris
ing a pivotable tensioning member connected with‘ the
other end portion and pivoting means operatively con
nected with said tensioning member for pivoting the same
in directions to twist and untwist said other‘ end portion 55
with respect to said one end portion and- to thereby re
spectively increase and reduce the tension of said biasing
means; and second tension adjusting means responsive to
a predetermined rotary movement of said tube in a di
rection to twist said one end portion with respect to said
10. A shock absorbing arrangement for cushioning the
movements of a seat for tractors and the like, said ar
rangement comprising, in combination, elongated biasing
means of the ribbon torsion spring type, said biasing
means having a ?rst and a second end portion; load trans
mitting means comprising a rotary tube at least partially
receiving said biasing means and non-rotatably connected
with one of said end portions, and a parallel motion sys~
tem including seat-supporting ?rst link means rigidly con
nected with said tube and second link means adapted to
60 abut against said tube to limit the rotary movement of said
other end portion and to thereby increase the tension of
said biasing means, said second adjusting means compris
tube in one direction; ?rst tension adjusting means com
prising a pivotable tensioning member connected with the
other end portion and pivoting means operatively con
arm located in the path of said projection and operatively
nected with said tensioning member for pivoting the same
connected with said pivoting means for adjusting said 65 in directions to twist and untwist said other end portion
ing a projection connected with said tube and a rockable
tensioning member so as to further increase the tension
with respect to said one end portion and to thereby re
of said biasing means when rocked by said projection in
response to said predetermined rotary movement of said,
tube.
8. A shock absorbing arrangement for cushioning the 70
spectively increase and reduce the tension of said biasing
means; and second tension adjusting means responsive
movements of a seat for tractors and the like, said ar
rangement comprising, in combination, elongated biasing
means of the ribbon torsion spring type, said biasing
means having a ?rst and a second end portion; load trans
to a predetermined rotary movement of said tube in a di
rection counter to said one direction so as to twist said
one end portion with respect to said other end portion
and to thereby increase the tension of said biasing means,
said second adjusting means comprising a projection con
nected with said tube and a rockable arm located in the
mitting means comprising. a rotary tube at least partially 75 path of said projection and operatively connected with
3,031,164
9..
10
said pivoting means for adjusting said tensioning member
to further increase the tension of said biasing means in
response to said predetermined rotary movement of said
tube.
so as to further increase the tension of said biasing means
when rocked by said projection in response to said prede
termined rotary movement of said tube.
11. A mechanical shock absorbing arrangement for
cushioning the movements of a load, such as the seat of
a conveyance or the like, said arrangement comprising, in
combination, elongated biasing means of the ribbon tor
sion spring type, said biasing means having a ?rst and a
14. A mechanical shock absorbing arrangement for
cushioning the movements of a load, said arrangement
comprising, in combination, elongated biasing means of
the ribbon torsion spring type, said biasing means having
a ?rst and a second end portion; load transmitting means
comprising a rotary member connected with one of said
second end portion; load transmitting means comprising 10 end portions; ?rst tension adjusting means comprising a
a rotary member connected with one of said end portions;
pivotable tensioning member connected with the other
?rst tension adjusting means comprising a pivotable ten
end portion and pivoting means operatively connected
sioning member connected with the other end portion and
with said tensioning member for pivoting the same in di
located within reach of the load, and pivoting means oper
rections to twist and untwist said other end portion with
atively connected with said tensioning member for pivot 15 respect to said one end portion and to thereby respectively
ing the same in directions to twist and untwist said other
end portion with respect to said one end portion and to
increase and reduce the tension of said biasing means;
and second tension adjusting means responsive to a rotary
thereby respectively increase and reduce the tension of
movement of said rotary member in a given direction to
said biasing means; and second tension adjusting means
twist said one end portion with respect to said other end
responsive to a predetermined rotary movement of said 20 portion and to thereby increase the tension of said bias
rotary member in a direction to twist said one end portion
ing means, said second adjusting means comprising means
with respect to said other end portion and to thereby in
operatively connected with said pivoting means for gradu
crease the tension of said biasing means, said second ad
ally adjusting said tensioning member so as to progres
justing means comprising means operatively connected
sively increase the tension of said biasing means when said
with said pivoting means for adjusting said tensioning 25 rotary member rotates in said given direction.
member so as to further increase the tension of said bias
ing means in response to said predetermined rotary move
15. A shock absorbing arrangement for cushioning the
movements of a load, said arrangement comprising, in
ment of said rotary member.
combination, elongated biasing means having a ?rst and
12. A shock absorbing arrangement for cushioning the
a second end portion; load transmitting means connected
movements of a load, such as the seat of a tractor or 30 with one of said end portions; and tension adjusting means
the like, said arrangement comprising, in combination,
connected with the other end portion, said tension adjust
supporting means; a substantially horizontal load trans
mitting tube rotatably mounted on said supporting means;
elongated biasing means at least partially received in said
ing means comprising a pivotable tensioning lever non
rotatably secured to said other end portion and pivoting
means for said lever including a cam and follower as
tube and having a ?rst and a second end portion, one of 35 sembly and a cam lever for operating said assembly.
said end portions non-rotatably connected with said tube;
16. A mechanical shock absorbing arrangement for
?rst tension adjusting means comprising a pivotable ten
sioning lever connected to the other end portion and pivot
cushioning the movements of a load, said arrangement
comprising, in- combination, elongated biasing means of
the ribbon torsion spring type, said biasing means having
ing means operatively connected with said lever for pivot
ing the same in directions to twist and untwist said other 40 a ?rst and a second end portion; load transmitting means
end portion with respect to said one end portion and to
comprising a rotary member connected with one of said
thereby respectively increase and reduce the tension of
end portions; ?rst tension adjusting means comprising a
pivotable tensioning member having a boss non-rotatably
said biasing means; and second tension adjusting means
responsive to a predetermined rotary movement of said
connected with the other end portion and pivoting means
tube in a direction to twist said one end portion with 45 operatively connected with said tensioning member for
respect to said other end portion and to thereby increase
pivoting the same in directions to twist and untwist said
other end portion with respect to said one end portion
the tension of said biasing means, said second adjusting
means comprising coupling means operatively connected
and to thereby respectively increase and reduce the ten
with said tube and with said pivoting means for pivoting
sion of said biasing means; and second tension adjusting
means responsive to a predetermined rotary movement of
said lever so as to further increase the tension of said
biasing means in response to said predetermined rotary
said rotary member in a direction to twist said one end
portion with respect to said other end portion and to
movement of said tube.
13. A shock absorbing arrangement for cushioning the
thereby increase the tension of said biasing means, said
movements of a load, such as the seat of a tractor or the
second adjusting means comprising means operatively con
like, said arrangement comprising, in combination, sup
porting means; a substantially horizontal load transmitting
55 nected with said pivoting means for adjusting said tension
ing member so as to further increase the tension of said
biasing means in response to said predetermined rotary
tube rotatably mounted on said, supporting means; elon
movement of said rotary member.
gated biasing means at least partially received in said tube
17. A shock absorbing arrangement for cushioning the
and having a ?rst and a second end portion, said biasing
means consisting of a laminated package including a plu 60 movements of a seat for tractors and the like, said ar
rangement comprising, in combination, elongated biasing
rality of ribbon torsion springs, one of said end portions
means of the ribbon torsion spring type, said biasing
non-rotatably connected with said tube; ?rst tension ad
means having a ?rst and a second end portion; load trans
justing means comprising a pivotable tensioning lever con
mitting means comprising a rotary tube at least partially
nected to the other end portion and pivoting means opera
receiving said biasing means and non-rotatably connected
tively connected with said lever for pivoting the same
with one of said end portions, and seat-supporting link
in directions to twist and untwist said other end portion
with respect to said one end portion and to thereby re
means rigidly connected with said tube; ?rst tension ad
justing means comprising a pivotable tensioning member
spectively increase and reduce the tension of said biasing
connected with the other end portion and pivoting means
means; and second tension adjusting means responsive to
a predetermined rotary movement of said tube in a direc 70 operatively connected with said tensioning member for
pivoting the same in directions to twist and untwist said
tion to twist. said one end portion with respect to said
other end portion with respect to said one end portion
other end portion and to thereby increase the tension of
and to thereby respectively increase and reduce the ten
said biasing means, said second adjusting means compris
sion of said biasing means; and second tension adjusting
ing coupling means operatively connected with said tube
and with said pivoting means for pivoting said lever so as 75 means responsive to the rotary movement of said tube in
11
3,031,164
a direction to twist said one end portion with respect to
said other end portion and to thereby increase the ten
sion of said biasing means, said second adjusting means
comprising a projection connected with said tube and a
rockable arm located in the path of said projection and
operatively connected With said pivoting means for adjust
ing said tensioning member so as to gradually increase
the tension of said biasing means when rocked by said
projection in response to the rotary movement of said
10
tube.
12
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,416,942
2,760,553
2,778,626
2,845,991
2,985,227
1922
1956
1957
1958
Leja _________________ __ May 23, 1961
935,338
Germany ____________ __ Nov. 17, 1955
Brooks _______________ __ May 23,
Lie _________________ __ Aug. 28,
Klepp _______________ __ Jan. 22,
Soderberg ____________ __ Aug. 5,
FOREIGN PATENTS
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 115 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа