Field of the Invention
[0001] The invention relates to a method for adjusting tension in springs mounted upon rotatable
shafts. Furthermore, the invention relates to a wrench suitable for utilizing the
method. Moreover, the invention relates to a collar system adapted for receiving said
wrench.
Technical Background
[0003] The installation of industrial, residential and in particular overhead doors usually
involves installing guides that support each side of a moveable door structure and
upon which the sides of the door structure are freely slideable. As most moveable
door structures are too heavy for a normal person to lift some sort of counterbalancing
device is usually provided so that the full weight of the moveable door structure
is not encountered when the moveable door structure is transferred between an opened
and closed condition or vice versa. Even with power operated door opener devices a
counter balance device is provided so as to be able to reduce the horsepower requirements
of the drive motor. For safety reasons the counter balancing device is also necessary
in the event of failure of the door openers.
[0004] A prevailing type of counter balancing device in wide use with such door openers,
especially ones that have power operated motors to assist the opening and closing
of the doors, is a coiled spring mounted upon a rotatable shaft. The shaft is usually
located above the opening that is to be covered by the door and is transversely located
across the path of the door. Upon this shaft is mounted a coiled spring in a somewhat
concentric manner such that the longitudinal centerline of the spring approximately
locates upon the longitudinal centerline of the shaft. One end of the spring is fixedly
attached to a structure upon which the shaft is rotatably mounted and the other end
of the spring is held releasably attached to the rotatable shaft.
[0005] The tensioning for the door takes the form of adjusting the tension exerted by the
coiled spring upon the rotatable shaft that also holds a wound drag element usually
attached to the lowermost end of the door. When properly adjusted the tension exerted
by the spring is supposed to just about counterbalance the weight of the door that
is being transferred during opening and closing movement.
[0006] The counterbalancing effect of the weight of the door may origin from the mid of
the door for some roller door arrangements or arranged such that it origins from a
fully opened condition. In original installation of the doors, when replacing broken
springs, and even during periodic maintenance, it is necessary to adjust the tension
of the springs to the desired degree so that the door can close and counterbalance
almost the entire weight of the door during the raising and lowering of the door.
To adjust the tension of the spring it is necessary for one to loosen the releasably
fixed end of the coil spring that is attached to the rotatable shaft and rotate the
end of the spring relative to the shaft, either in a manner to lessen the tension
or to tighten the tension.
[0007] The springs used in such installations are not insubstantial in the force and/or
torque that they exert to accomplish their task and it is therefore considered by
those skilled in the art a potentially dangerous operation. When the one end of the
spring attached to the rotatable shaft is loosened it must be securely held so as
not to freely uncoil back to a tension free state. Such an uncoiling while a workman
or other person is in the area may produce some very severe injuries.
[0008] The prevailing method in today's door industry is to adjust tension of the spring
during installation on location of the door and afterwards during service and maintenance.
An adapter is conventionally applied on the shaft for providing a possibility to wind
the shaft by means of iron bars or the like stuck into one of the holes provided on
the adapter. Especially, during service and maintenance when there is also a need
to release the spring from the shaft before tension adjustment may begin the operation
of arranging such an adapter is often troublesome and sometimes even hazardous. As
an example one common way of locking the spring retainer and thus the spring in relation
to the shaft is to fix the spring retainer by one or more wedges between the shaft
and a space provided in the spring retainer. The wedge/s are released in the axial
direction and sometimes it may be that there is no room for fixing the adapter on
the shaft if the wedges are to be pulled out.
[0009] It is an object of the present invention to provide a safe and efficient method for
the tensioning of coiled springs used in door installations. It is an object of the
present invention to provide an improved tool for use in properly tensioning springs
used in door installations. It is a further object of the present invention to provide
a new attachment for coil springs that will ease the operation of adjusting the tension
of coiled springs in door installations.
Summary of the Invention
[0010] These and other objects, which will be presented further on, are achieved by the
method according to independent claim 1. Preferred steps of the method are described
in the dependent claims. It is also disclosed a wrench assembly and a collar system.
Preferred embodiments of the invention are presented in the respective dependent claims.
[0011] Now, according to the present invention it is disclosed a method for adjusting tension
in springs mounted upon rotatable shafts, said method comprises the steps of, applying
a first and a second wrench for splined engagement with a collar of said shaft so
as to hold the collar against movement in an undesired direction, said collar being
connected to at least one spring, adjusting tension in said at least one spring by
winding said collar with at least one of said wrenches until an appropriate tension
of the spring is achieved. The collar comprises a locking device for fixing said collar
to said shaft when the tension of the spring is properly adjusted.
[0012] This enables secure working conditions and support for finding correct position and
a thorough splined engagement during holding or working against the resilient force
from the spring. In addition the splined engagement allows for service work and installation
work even where there is little room for such operations.
[0013] Preferably, the axial locking engagement is maintained during a whole spring tension
adjusting cycle, involving splined disengagement during alternation of said wrenches.
[0014] Advantageously, the axial locking engagement is enabled by a tongue and groove engagement
in which said tongue propagates circumferentially and in the transverse direction
(B) in relation to the axial direction (A). Accordingly, the axial locking device
engagement comprises a tongue and groove locking relative to the axial direction (A)
of the shaft.
[0015] More preferably, the axial locking device comprises a U-shaped retractable plate
for complementary engagement with a recess in said collar. Alternatively, although
not preferred, the collar comprises a U-shaped protruding portion for complementary
engagement with a recess in said axial locking device.
[0016] Preferably, the splined engagement of the wrench and collar is accomplished with
a wrench spline angle less than 90 degrees and preferably between 80 and 90 degrees.
A complementary fit of the splines of the wrench and the splines of the collar reduces
the risk for slipping. It has been discovered that an angle between the front edge
of the wrench spline of slightly less than 90 degress measured between the inner near
surface of the jaw and said front edge provides for improved grip. Advantageously,
the splined engagement involves engagement with splines propagating in the axial direction
(A) of said shaft.
[0017] A further advantage is that the splined engagement is controllable by a latch function
maneuverable from a latch operating handle of said wrench. Hence, the serviceman or
installer do not have to change the grip of the wrench handle e.g when disengaging
the splined engagement when adjusting tension.
[0018] According to a preferred embodiment of the invention the torque of said splined engagement
is controllable and lockable by a torque locking mechanism being maneuverable from
said wrench.
[0019] Preferably, each wrench having an open ended jaw, with a close fit around a substantial
portion of said collar and said opened ended jaw being provided for splined engagement
with said collar.
[0020] The method of adjusting tension in springs is particularly well suited for a group
consisting of overhead sliding doors, sliding doors and winding roller doors according
to any one of the preceding claims. The skilled person knowing of the invention may
however find other areas of interest.
[0021] According to a second aspect of the invention a wrench assembly which comprises,
an elongate handle, an open ended jaw formation located on one end of said handle
for closely surrounding and engaging a majority of the perimeter of a splined shaft,
a spring loaded spline latch mechanism mounted on said handle and having a latch that,
in a first position, protrudes into a jaw engagement area for splined engagement on
said shaft and, in a second position is retracted from the jaw engagement area for
splined disengagement, a latch operating device for moving said latch from one of
said first position and said second position to the other of said first and second
position.
[0022] This enables secure working conditions and support for finding correct position and
a thorough splined engagement during holding or working against the resilient force
from the spring. In addition the splined engagement allows for service work and installation
work even where there is little room for such operations.
[0023] Preferably, the wrench spline angle is less than 90 degrees and preferably between
80 and 90 degrees.
[0024] Advantageously, the splined engagement is controllable by a latch maneuverable from
a latch operating handle of said wrench assembly.
[0025] As a further advantage and an important safety aspect the disengagement of said splined
engagement is prevented by a spring loaded spline latch mechanism as long as the latch
is subject to an external loading resulting from the splined engagement. The latch
operating handle is operatively connected to the latch via a spring. If the loading
on the latch exceeds the loading from the spring resulting from activating the latch
operating handle the latch will remain in position for splined engagement, i.e. the
force provided by the spring too the spring loaded latch mechanism is too low to disengage
the splined engagement. Thus, if the installer or serviceman due to a mistake let
go of both splined engagements at the same time at least one wrench when arranged
properly will maintain the splined engagement.
[0026] The spring load in the spring loaded splined engagement is preferably provided by
a push spring. The push spring is connected to a rod of the latch. The latch operating
handle is operatively connected to the rod of the latch via a spring. The spring characteristics
of the push spring is low. Since the wrench spline angle is less than 90 degrees and
preferably between 80 and 90 degrees the external loading does not have to be substantial
in order to provide enough resistance to disengagement. On the other hand when there
is no external load on said latch and the latch operating handle is activated the
latch is retracted by the pull force transferred from the latch operating handle to
said push spring. When the latch operating handle is released the latch is pushed
back in position for splined engagement in the jaw area by said push spring.
[0027] Moreover, the torque of said splined engagement is controllable and lockable by a
torque locking mechanism being maneuverable from said wrench assembly. In order to
allow smooth access and transfer the force from the wrench assembly efficiently to
said spring via the collar the wrench assembly has an asymmetric opening of the open
ended jaw.
[0028] Furthermore, the wrench assembly is provided with a hook for enabling hanging of
said wrench assembly. It is realized that many doors requires such work on a substantial
altitude and the hook facilitates for such situations.
[0029] According to a preferred embodiment of the invention the wrench assembly is provided
with replaceable handle portions in order to enable a wrench assembly with different
lengths. The replaceable handle portion having the most suitable length may be screwed
on to the elongate handle of the wrench assembly.
[0030] A further advantage is that the handle is provided with a knob on the end portion
in order to facilitate picking up of said wrench assembly. Preferably, the knob extends
from the handle portion to an extent such that if there is a risk for an operator's
fingers to become pinched between a structural element, such as a wall, and the handle
portion the knob will provide enough room there between to avoid serious finger pinching.
A further object with the knob is to enable protection against slipping of the wrench
in that it provides for support against loosing the grip during use in the axial direction
of the elongate handle.
[0031] Now, according to a third aspect of the invention a collar system for being rotatably
mounted upon a shaft and thus enabling tensioning of springs mounted upon rotatable
shafts is presented, which collar system comprises, a secondary attachment portion
adapted for connection to one end of said spring mounted upon said shaft, a primary
attachment portion on said collar having longitudinally (C) extending splines formed
on the outer periphery of said primary attachment portion.
[0032] This enables secure working conditions and support for finding correct position and
a thorough splined engagement during holding or working against the resilient force
from the spring. In addition the splined engagement allows for service work and installation
work even where there is little room for such operations. Preferably, the secondary
attachment portion and the primary attachment portion form one unit.
[0033] The collar system comprises a locking device for fixing said collar to said shaft.
During this step holding of one wrench against the spring tension is sufficient and
allows for fixing the collar in relation to the shaft when the tension in the spring
is properly adjusted.
[0034] According to an alternative embodiment of the third aspect of the invention said
collar system comprises a body formed for attachment to at least said primary attachment
portion, said body comprising complementary engagement means on its inside and holes
propagating from the outside towards the inside of said body, said holes being arranged
for receiving an alternative tension adjusting tool such as an iron bar. This body
enables the use of a currently conventional method of adjusting springs, using bars,
e.g. in case wrenches of the preferred type is not available
[0035] Preferably, said holes are arranged at given distances around a periphery of said
body when following the periphery in the transverse (D) direction.
Brief description of the drawings
[0036] A preferred method together with currently preferred embodiments of the invention
will now be disclosed by means of the appended drawings in which:
fig. 1a schematically discloses an overhead sliding door or sectional door of conventional
type,
fig. 1b schematically discloses a winding roller door of conventional type,
fig. 2 discloses a wrench according to a preferred embodiment of the invention as
seen in perspective,
fig. 3 discloses a wrench according to a preferred embodiment of the invention as
seen from the side in an opened up manner in order to more clearly illustrate the
features of the wrench,
fig. 4 discloses a collar according to a preferred second aspect of the invention
in a perspective view,
fig. 5 discloses a preferred manner of applying the method according to a preferred
method of the invention in a cut out perspective view,
Detailed description of a preferred method and embodiments
[0037] In the following some non restricting embodiments will be described with support
from the drawings and with reference to the numbering thereof in order to more clearly
illustrate the functions and features. Referring now to figs. 4 and 5 the method will
be disclosed in more detail.
[0038] A coiled spring 57 is arranged around a shaft and fixed arranged to the surrounding
structure of the door in one end (not shown). This represents a more typical type
of spring tensioned shafts for doors that are designed for being wound up today. A
collar 50 is threaded onto the coiled spring 57 from the side such that a flange 55
follows the spiral path of the coiled spring 57. A connecting element 59 is provided
on the collar for connection with the end portion of the coiled spring, which is normally
cranked. When the cranked end portion connects with the connecting element 59 the
collar 50 is fixed in relation to the coiled spring 57 which is held between the flange
55 and connecting element 59. The collar 50 is however rotatable in relation to said
shaft. The rotatable collar will have a set of screws 56 that may be positioned so
as to engage the shaft member and hold the collar non-rotatable with the shaft.
[0039] When the coil spring 57 is in its free state there is no danger to personnel in the
area of the spring mechanism. However, when the rotatable collar 50 has been wound
so that the end is in a tension position with respect to the end a dangerous condition
exists. At that point the collar 50 must be held firmly in position so that it will
not suddenly uncoil.
[0040] Furthermore, the primary attachment portion 51 on said collar 50 has longitudinally
(C) extending splines 52 formed on the outer periphery of said primary attachment
portion 51, and said primary attachment portion (51) is provided with at least one
groove propagating transverse (D) to said splines 52. As will be seen in fig 4 the
secondary attachment portion 54 and the primary attachment portion 51 form one unit.
Thus it is possible to perform a safe and smooth tension adjustment with the wrenches
1, 1' only by access to the primary attachment portion 51.
[0041] Now, also turning to fig 3 a wrench assembly 1 according to the present invention
having an elongate handle 2 an engagement section in the form of an open ended jaw
3 is disclosed. The wrench is designed so that the area within the engagement section
will form a close fit over the outer diameter of the splined section of the collar
50. When the latch operating device 5 is in normal condition the spline latch mechanism
4 is protruding upwardly so that the engaging splines of the wrench 15 is in the area
of the engagement section 3. Initially a lever arm activates the recessed tongue for
axial locking of the wrench 1.
[0042] A pull of the latch operating device 5 towards the elongate handle 2 allows the plunger
member to travel inwardly pulling the spline latch mechanism 4 in to the elongate
handle 2. In this manner the engagement section 3 may then be slid over the spline
section of adapter. When the wrench splines 15 are engaged with the spline section
the exerting of a force on handle 2 of wrench 1 will exert a force so as to tend to
rotate the rotatable collar 50.
[0043] As it will become more clear two wrenches 1, 1' may engage the spline section of
the collar 50. When two such wrenches 1, 1' engage the collar 50 the set screws 56
on the rotatable collar 50 may be loosened. When the rotatable collar 50 is loosened
from its connection of the shaft wrenches 1, 1' may be used to hold collar 50 from
rotating on the shaft. While holding one wrench 1 that has its spline latch mechanism
15 engaged with the splines 52 of the collar the second wrench may have the latch
operating device 5 activated so as to disengage its wrench splines 15 from the spline
section of collar 50. With the first wrench 1 holding the collar non rotatable with
the shaft, the second wrench 1' may then be advanced pivotal around the splined section
of the collar 50. When the second wrench 1' is in a new position the spline latch
mechanism 4 may be released so that its wrench splines 15 engages the spline section
of collar 50. When the second wrench 1' being held in such a position, the latch operating
device 5 of the first wrench 1 may be activated so that spline latch mechanism 15
is disengaged from the splines of the collar. The second wrench 1' may now be rotated
back until its elongated handle 2 is in alignment with the first wrench 1. Repeating
the above procedure with the first wrench 1 and the second wrench 1' will allow one
to properly adjust tension of the coil spring 57 while maintaining an axial locking
of the respective wrench 1,1' by means of the activated axial locking device. This
describes the alternation of the wrenches in more detail.
[0044] As a further advantage and an important safety aspect the disengagement of said splined
engagement is prevented by said spring loaded spline latch mechanism as long as the
latch is subject to external loading. The spline latch mechanism 4 comprises a tensioned
push spring 13 working against a rod 6 connecting said latch operating device 5 with
said spline latch mechanism 4.
[0045] As a further advantage and an important safety aspect the disengagement of said splined
engagement is prevented by a spring loaded spline latch mechanism 4 as long as the
latch 15 is subject to an external loading resulting from the splined engagement.
The latch operating handle 5 is operatively connected to the spline latch mechanism
4 via a spring 13. If the loading on the latch 15 exceeds the loading from the spring
13 resulting from activating the latch operating handle 5 the latch 15 will remain
in position for splined engagement, i.e. the force provided by the spring 13 to the
spring loaded latch mechanism 4 is too low to disengage the splined engagement. Thus,
if the installer or serviceman due to a mistake activate the latch operating handles
5 of bothe wrenches at the same time at least one wrench when arranged properly will
maintain the splined engagement due to the external loading from the coiled spring.
[0046] The spring load in the spring loaded splined engagement is preferably provided by
a push spring. The push spring is connected to a rod of the latch. The latch operating
handle is operatively connected to the rod of the latch via a spring. The spring characteristics
of the push spring is low. Since the wrench spline angle is less than 90 degrees and
preferably between 80 and 90 degrees the external loading does not have to be substantial
in order to provide enough resistance to disengagement. On the other hand when there
is no external load on said latch and the latch operating handle is activated the
latch is retracted by the pull force transferred from the latch operating handle to
said push spring. When the latch operating handle is released the latch is pushed
back in position for splined engagement in the jaw area by said push spring.
[0047] Moreover, the torque resistance of said splined engagement is controllable and lockable
by a torque locking mechanism 14 being maneuverable from said wrench assembly. The
torque locking mechanism 14 consist of a screw or similar attached through the wall
of the elongated handle 2. The screw may enter a pocket of the spline latch mechanism
4 from the side and support the bottom of the pocket. At the same time the pocket
is stretched in the axial direction of the elongated handle 2 so as to allow for movement
of the spline latch mechanism 4 if activated. Moreover, in order to allow smooth access
and transfer of the force from the wrench assembly 1 efficiently to said spring 57
via the collar 50 the wrench assembly 1 has an asymmetric opening of the open ended
jaw 3.
[0048] The axial locking engagement is enabled by a tongue and groove engagement in which
said tongue propagates circumferentially and in the transverse direction (B) in relation
to the axial direction (A). This is probably more clear in fig 2. The axial locking
device comprises a U-shaped retractable plate for complementary engagement with a
recess in said collar 50. Alternatively, although not shown, the collar may comprise
a U-shaped protruding portion for complementary engagement with a recess in said axial
locking device.
[0049] Furthermore, the wrench assembly 1 is provided with a hook 18 for enabling hanging
of said wrench assembly 1. It is realized that many doors requires such work on a
substantial altitude and the hook 18 facilitates for such situations since there is
often not so much space for laying tools when not used.
[0050] According to a preferred embodiment of the invention the wrench assembly 1 is provided
with replaceable handle portions 23 in order to enable a wrench assembly 1 with different
lengths. The replaceable handle portion 23 having the most suitable length may be
screwed on to the elongate handle of the wrench assembly (not shown).
[0051] A further feature of the invention is that the handle 23 is provided with a knob
24 on the end portion in order to facilitate picking up said wrench assembly. According
to a preferred embodiment of the invention, the knob extends from the handle portion
to an extent such that if there is a risk for an operator's fingers to become pinched
between a structural element, such as a wall, and the handle portion the knob will
provide enough room there between to avoid serious finger pinching. A further object
with the knob is to enable protection against slipping of the wrench in that it provides
for support against loosing the grip during use in the axial direction of the elongate
handle.
It is appreciated that the various features for enabling improved tension adjustment
described in the above given examples may readily be combined in various ways without
departing from the scope of protection.
1. A method for adjusting tension in springs (57) mounted upon rotatable shafts mounted
on a door said method comprises the steps of, applying a first and a second wrench
(1,1') for splined engagement with a collar (50) of said shaft so as to hold the collar
(50) against movement in an undesired direction, said collar (50) being connected
to at least one spring (57), adjusting tension in said at least one spring (57) by
winding said collar (50) with at least one of said wrenches (1,1') until an appropriate
tension of the spring (57) is achieved.
2. The method according to claim 1, which comprises the step of positioning an axial
locking device, said axial locking device being provided on at least one of said wrenches
(1, 1'), to said collar (50) thereby forming an axial locking engagement of said wrenches
(1,1') to said collar (50).
3. The method according to any one of claim 2, in which the axial locking engagement
is maintained during a whole spring tension adjusting cycle, involving splined disengagement
during alternation in position of one of said wrenches (1,1').
4. The method according to any one of claims 2-3, in which said axial locking device
engagement comprises a tongue and groove locking relative to the axial direction (A)
of the shaft.
5. The method according to any one of claims 1-4, in which the splined engagement of
the wrench (1,1') and collar (50) is accomplished with a wrench spline angle (16)
less than 90 degrees and preferably between 80 and 90 degrees.
6. The method according to any one of claims 1-5, in which said splined engagement involves
engagement with splines (52) propagating in the axial direction (A) of said shaft.
7. The method according to any one of claims 1-6, in which said splined engagement is
controllable by a latch function maneuverable from a latch operating handle (5) of
said wrench (1, 1').
8. The method according to any one of claims 1-7, in which torque of said splined engagement
is controllable and lockable by a torque locking mechanism (14) being maneuverable
from said wrench (1, 1').
9. The method according to any one of claims 1-8, in which each wrench (1,1') having
an open ended jaw (3), with a close fit around a substantial portion of said collar
(50) and said opened ended jaw (3) being provided for splined engagement with said
collar (50).
10. Method of adjusting tension in springs (57) mounted on any one from the group consisting
of overhead sliding doors (81), sliding doors and winding roller doors (91) according
to any one of the preceding claims.
11. The method according to any one of claims 1-9, in which said axial locking device
comprises a U-shaped retractable plate for complementary engagement with a recess
in said collar (50).
12. The method according to any one of claims 1-9, in which said collar comprises a U-shaped
protruding portion for complementary engagement with a recess in said axial locking
device.
1. Verfahren zum Justieren der Spannung von Federn (57), die auf drehbaren Wellen montiert
sind, welche an einem Tor montiert sind, wobei das Verfahren folgende Schritte umfasst:
Ansetzen eines ersten und eines zweiten Schraubenschlüssels (1, 1') in einen Keilprofileingriff
mit einem Kranz (50) der Welle, um den Kranz (50) gegen eine Bewegung in einer unerwünschten
Richtung zu sichern, wobei der Kranz (50) mit mindestens einer Feder (57) verbunden
ist; und Justieren der Spannung der mindestens einen Feder (57) durch Verdrehen des
Kranzes (50) mit mindestens einem der Schraubenschlüssel (1, 1'), bis eine ausreichende
Spannung der Feder (57) erreicht ist.
2. Verfahren nach Anspruch 1, das folgenden Schritt umfasst: Positionieren einer axialen
Arretierungsvorrichtung, wobei die axiale Arretierungsvorrichtung an mindestens einem
der Schraubenschlüssel (1, 1') angeordnet ist, an dem Kranz (50), wodurch ein axialer
arretierender Eingriff der Schraubenschlüssel (1, 1') mit dem Kranz (50) gebildet
wird.
3. Verfahren nach Anspruch 2, wobei der axiale arretierende Eingriff während eines gesamten
Federspannungsjustiervorgangs beibehalten bleibt, wobei der Keilprofileingriff gelöst
wird, wenn die Position eines der Schraubenschlüssel (1, 1') verändert wird.
4. Verfahren nach einem der Ansprüche 2-3, wobei der axiale Eingriff der Arretierungsvorrichtung
eine Feder-Nut-Arretierung relativ zur axialen Richtung (A) der Welle umfasst.
5. Verfahren nach einem der Ansprüche 1-4, wobei der Keilprofileingriff des Schraubenschlüssels
(1, 1') und des Kranzes (50) mit einem Schraubenschlüssel-Keilprofil-Winkel (16) von
weniger als 90 Grad und bevorzugt zwischen 80 und 90 Grad erreicht wird.
6. Verfahren nach einem der Ansprüche 1-5, wobei der Keilprofileingriff einen Eingriff
mit Keilprofilen (52) beinhaltet, die in der axialen Richtung (A) der Welle verlaufen.
7. Verfahren nach einem der Ansprüche 1-6, wobei der Keilprofileingriff durch eine Arretierungsfunktion
gesteuert werden kann, die über einen Arretierungsbediengriff (5) des Schraubenschlüssels
(1, 1') betätigt werden kann.
8. Verfahren nach einem der Ansprüche 1-7, wobei das Drehmoment des Keilprofileingriffs
durch einen Drehmomentarretierungsmechanismus (14) gesteuert und arretiert werden
kann, der von dem Schraubenschlüssel (1, 1') aus betätigt werden kann.
9. Verfahren nach einem der Ansprüche 1-8, wobei jeder Schraubenschlüssel (1, 1') ein
offenendiges Maul (3) aufweist, das einen fest anliegenden Sitz um einen wesentlichen
Abschnitt des Kranzes (50) herum einnimmt, und wobei das offenendige Maul (3) für
einen Keilprofileingriff mit dem Kranz (50) vorgesehen ist.
10. Verfahren zum Justieren der Spannung von Federn (57), die an Überkopf-Schiebetoren
(81) oder Schiebetoren oder Rolltoren (91) montiert sind, nach einem der vorangehenden
Ansprüche.
11. Verfahren nach einem der Ansprüche 1-9, wobei die axiale Arretierungsvorrichtung eine
U-förmige einziehbare Platte für einen komplementären Eingriff mit einer Aussparung
in dem Kranz (50) umfasst.
12. Verfahren nach einem der Ansprüche 1-9, wobei der Kranz einen U-förmigen hervorstehenden
Abschnitt für einen komplementären Eingriff mit einer Aussparung in der axialen Arretierungsvorrichtung
aufweist.
1. Procédé pour ajuster une tension dans des ressorts (57) montés sur des arbres rotatifs
montés sur une porte, ledit procédé comprend les étapes consistant à appliquer une
première et une seconde clé (1, 1') à des fins de mise en prise cannelée avec un collier
(50) dudit arbre de manière à maintenir le collier (50) contre un mouvement dans une
direction indésirable, ledit collier (50) étant raccordé au moins à un ressort (57),
ajuster une tension dans ledit au moins un ressort (57) en enroulant ledit collier
(50) avec au moins une desdites clés (1, 1') jusqu'à ce qu'une tension appropriée
du ressort (57) soit atteinte.
2. Procédé selon la revendication 1, qui comprend l'étape de positionnement d'un dispositif
de verrouillage axial, ledit dispositif de verrouillage axial étant prévu sur au moins
une desdites clés (1, 1') audit collier (50) en formant ainsi une mise en prise par
verrouillage axial desdites clés (1, 1') audit collier (50).
3. Procédé selon la revendication 2, dans lequel la mise en prise par verrouillage axial
est maintenue pendant un cycle complet d'ajustement de tension de ressort, impliquant
une mise hors prise cannelée pendant une alternance de position d'une desdites clés
(1, 1').
4. Procédé selon une quelconque des revendications 2 à 3, dans lequel ladite mise en
prise de dispositif par verrouillage axial comprend un verrouillage à rainure et languette
par rapport à la direction axiale (A) de l'arbre.
5. Procédé selon une quelconque des revendications 1 à 4, dans lequel la mise en prise
cannelée de la clé (1, 1') et du collier (50) est accomplie avec un angle de cannelure
de clé (16) inférieur à 90 degrés et de préférence compris entre 80 et 90 degrés.
6. Procédé selon une quelconque des revendications 1 à 5, dans lequel ladite mise en
prise cannelée implique une mise en prise avec des cannelures (52) se propageant dans
la direction axiale (A) dudit arbre.
7. Procédé selon une quelconque des revendications 1 à 6, dans lequel ladite mise en
prise cannelée peut être contrôlée par une fonction de loquet manoeuvrable à partir
d'une poignée d'actionnement de loquet (5) de ladite clé (1, 1').
8. Procédé selon une quelconque des revendications 1 à 7, dans lequel le couple de ladite
mise en prise cannelée peut être contrôlé et verrouillé par un mécanisme de verrouillage
de couple (14) étant manoeuvrable à partir de ladite clé (1, 1').
9. Procédé selon une quelconque des revendications 1 à 8, dans lequel chaque clé (1,
1') a une mâchoire à extrémité ouverte (3) avec un ajustement étroit autour d'une
portion substantielle dudit collier (50) et de ladite mâchoire à extrémité ouverte
(3) étant prévu à des fins de mise en prise cannelée avec ledit collier (50).
10. Procédé d'ajustement d'une tension dans des ressorts (57) montés sur une quelconque
du groupe comprenant des portes coulissantes suspendues (81), des portes coulissantes
et des portes à cylindres d'enroulement (91) selon une quelconque des revendications
précédentes.
11. Procédé selon une quelconque des revendications 1 à 9, dans lequel ledit dispositif
de verrouillage axial comprend une plaque rétractable en forme de U à des fins de
mise en prise complémentaire avec un évidement dans ledit collier (50).
12. Procédé selon une quelconque des revendications 1 à 9, dans lequel ledit collier comprend
une portion protubérante en forme de U à des fins de mise en prise complémentaire
avec un évidement dans ledit dispositif de verrouillage axial.