An assembly and a method for tensioning a balancing spring of a sectional door system while assembling the sectional door system

Abstract

The disclosure relates to an assembly (100) comprising a spring break protection mechanism (102), a spring plug (104) for connecting a balancing spring (106) of a sectional door system (200) to the spring break protection mechanism (102), and a locking mechanism (108) for locking the spring break protection mechanism (102) while tensioning the balancing spring (106). The disclosure further relates to a method (300) for tensioning a balancing spring (110) of a sectional door system (200) while assembling the sectional door system (200) and a kit of parts (400) for locking a ratchet wheel (116) of the spring break protection mechanism (102) during installation of a balancing spring (106) in a sectional door system (200).

Description

[0001] An assembly and a method for tensioning a balancing spring of a sectional door system while assembling the sectional door system

[0002] Technical field

[0003] The present disclosure relates to sectional door systems and installation of such. In particular aspects, the disclosure relates to an assembly and a method for tensioning a balancing spring of a sectional door system while assembling the sectional door system. The disclosure also relates to a kit of parts for locking a ratchet wheel of a spring break protection mechanism during installation of a balancing spring in a sectional door system as defined in the introductory parts of the independent claims.

[0004] Background art

[0005] Overhead sectional doors open upwards towards the ceiling thereby maximizing space around the door opening. The doors consist of several interlinked panels or sections forming the door leaf and thereby offer great flexibility. Torsion springs, generally two springs per door, are used to balance out the total weight of the door leaf, so the overhead sectional door can be opened with 'ease'. If the door is (partly) open and one of the springs breaks, the system may get out of balance, which can cause the door leaf to fall with force. This can lead to dangerous situations. In case of only one torsion spring, the danger is even higher.

[0006] To avoid these dangerous situations usually a torsion spring is connected to a so-called spring break device (SBD), i.e. a safety device that is arranged to stop the fall of the door leaf in case the torsion spring is broken. At the end of the torsion spring a plug is commonly attached and is arranged to be connected to a base plate of the SBD.

[0007] Installing overhead sectional doors having such a torsional spring arrangement attached to an SBD may, however, involve a lot of installation steps to be performed by a mechanic. To this end, EP 2 669456 Bl discloses an improved assembly comprising a spring break protection mechanism and a spring plug. There is, however, a further need for assemblies allowing for easier, safer and less time-consuming installation of overhead sectional doors.

[0008] Summary

[0009] It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above mentioned problem. According to a first aspect there is provided an assembly comprising a spring break protection mechanism, a spring plug for connecting a balancing spring of a sectional door system to the spring break protection mechanism, and a locking mechanism for locking the spring break protection mechanism while tensioning the balancing spring, the spring break protection mechanism comprising: a base plate arranged for connection to the fixed world, and comprising an opening for receiving a balancing axle of the sectional door system, a ratchet wheel rotatably arranged at a first side of the base plate, the ratchet wheel being arranged to cooperate with the balancing axle; a pawl pivotably connected to the base plate at the first side thereof, wherein the pawl is pivotable between a first position, in which the ratchet wheel is free-running, and a second position in which the pawl blocks the ratchet wheel; an extension attached to the pawl and extending from the pawl to beyond a second side of the base plate, wherein the base plate and the spring plug are arranged for bayonet mount interaction with each other, wherein upon the spring plug is placed against the second side of the base plate and then rotated in a first direction for bayonet connection, part of the spring plug thereby pushes the extension so as to force the pawl in the first position; and upon the spring plug is then rotated in a second direction opposite to the first direction, the pawl moves into the second position, to block the ratchet wheel so as to avoid rotation of the balancing axle, wherein the locking mechanism comprises: a locking member arranged to removably engage with the ratchet wheel; and a locking arrangement arranged to removable fixate the locking member to the base plate such that the spring break protection mechanism is locked, thereby hindering the ratchet wheel from rotating while the balancing spring is tensioned.

[0010] An advantage being the assembly allows for an easier, safer and less time-consuming installation of sectional door systems. In more detail, an advantage of the assembly provided is that the complexity of the assembly is reduced facilitating installation and reducing the risk for damaging the assembly as such, the sectional door system or the mechanic installing or performing maintenance to the sectional door system. A further advantage of the assembly is that it uses cost-efficient components. A more cost-efficient production of the assembly is moreover achieved. The locking mechanism may prevent the balancing axle from rotating.

[0011] The spring break protection mechanism may in some examples be referred to as a spring break device.

[0012] According to some examples, the locking may be understood as a temporarily locking.

[0013] According to some examples, the locking member has an engagement opening with engagement portions arranged to removable engage with teeth of the ratchet wheel.

[0014] An advantage being that a large contact surface between the locking member and the ratchet wheel is provided. A more efficient locking of the ratchet wheel is thereby provided. Constraints on the material properties of the locking member are thereby reduced. By way of example, the thickens of the locking member may be reduced. Less material may thereby be used.

[0015] According to some examples, the locking member may be in the form of a disc or plate.

[0016] According to some examples, the locking member may have a head portion arranged to removably engage with the ratchet wheel. The head portion may have an engagement opening. The engagement opening may comprise a profile. The locking member may further have a shaft or handle arranged to facilitate the engaging of the locking member to the ratchet wheel.

[0017] According to some examples, the locking member is arranged such that it is slidably movable along the ratchet wheel in a direction perpendicular to the rotation direction of the ratchet wheel.

[0018] An advantage being that a faster and less complex positioning of the locking member may be achieved.

[0019] According to some examples, the locking arrangement is a screw and nut arrangement.

[0020] An advantage being that an easier, safer and less time-consuming installation of sectional door systems may be achieved. A further advantage is that cost-efficient and reliable components may be used. Standard tools may, moreover, be used for the locking the locking arrangement.

[0021] According to some examples, the locking arrangement is a bolted joint. According to some examples, the locking member comprises a through hole and wherein the locking arrangement is arranged to extend through the through hole and to clamp an edge portion of the base plate, thereby locking the spring break protection mechanism while tensioning the balancing spring.

[0022] An advantage being that a robust locking mechanism is provided. An easier and less time-consuming locking of the spring break protection mechanism may be further be achieved. The tensioning of the balancing spring may thereby be performed in a safer manner.

[0023] According to some examples, the locking member comprises a through hole and the base plate comprises a complementary through hole, wherein the locking arrangement is arranged to extend through the through holes, thereby locking the spring break protection mechanism while tensioning the balancing spring.

[0024] An advantage being that a precise and easy to align locking arrangement is provided. Put differently, the holes of the locking member and the base plate may be aligned. An easier and less time-consuming locking of the spring break protection mechanism may be thereby be achieved using the locking arrangement. A reproducible locking may also be obtained. The tensioning of the balancing spring may thereby be performed in a safer manner. An efficient locking may be obtained even if the locking arrangement is partly loosened.

[0025] According to some examples, the balancing spring is a torsion spring.

[0026] An efficient biasing of the section door may thereby be obtained. To this end, the balancing spring may thereby be used to efficiently balance out the total weight of the door leaf of the sectional door. An easier handling of the opening of the sectional door may therefore be obtained.

[0027] According to some examples, the balancing spring may be arranged around the balancing axle. The balancing spring may be coupled to the balancing axle. The balancing spring may be coupled to the balancing axle at an outer end of the balancing spring.

[0028] According to some examples, the base plate further comprises a second opening or an indentation, through which the extension is extending from the pawl to the second side of the base plate. According to a second aspect there is provided a method for tensioning a balancing spring of a sectional door system while assembling the sectional door system, the method comprising: assembling the assembly according to the first aspect; engaging the spring plug for connecting the balancing spring of the sectional door system and the base plate of the spring break protection mechanism in a bayonet mount interaction with each other such that the spring plug is placed against the second side of the base plate and then rotated in a first direction for bayonet connection, part of the spring plug thereby pushes the extension so as to force the pawl in the first position; engaging the locking member of the locking mechanism with the ratchet wheel and removably fixating the locking member to the base plate thereby hindering the ratchet wheel from rotating; tensioning the balancing spring while the locking member is fixed to the base plate; locking the tensioned balancing spring to the balancing axle; loading the balancing spring by attaching sections of the sectional door system; removing the locking mechanism such that the ratchet wheel is free to rotate.

[0029] Effects and features of the second aspect are to a large extent analogous to those described above in connection with the first aspect. Examples mentioned in relation to the first aspect are largely compatible with the second aspect.

[0030] According to some examples, the locking of the tensioned balancing spring is by fixating the balancing spring to the balancing axle at a fixation point on the balancing axle.

[0031] An easier and less time-consuming locking of the balancing spring may be thereby be achieved.

[0032] According to some examples, the fixation point may be arranged at a distal end of the balancing spring, the distal end being opposite in an axial direction to the side of the balancing spring having the spring plug.

[0033] According to some examples, the engaging the locking member of the locking mechanism with the ratchet wheel is by slidably moving the locking member along the ratchet wheel in a direction perpendicular to the rotation direction of the ratchet wheel. An advantage being that a faster and less complex positioning of the locking member may be achieved.

[0034] According to some examples, the ratchet wheel comprises teeth and the locking member has an engagement opening with engagement portions, and wherein the engaging of the locking member with the ratchet wheel is by engaging teeth with engagement portions.

[0035] An advantage being that a large contact surface between the locking member and the ratchet wheel is provided. An advantage being that a faster and less complex positioning of the locking member may be achieved. A faster and more efficient locking of the ratchet wheel is also provided.

[0036] According to some examples, the removably fixating of the locking member to the base plate is by locking a screw and nut arrangement.

[0037] An advantage being that an easier, safer and less time-consuming installation of sectional doors may be achieved. A further advantage is that standard tools may be used.

[0038] According to some examples, the locking member comprises a through hole and wherein the method comprises removably fixating the locking member to the base plate by arranging the locking arrangement to extend through the through hole and clamping an edge portion of the base plate.

[0039] An advantage being that a quick and robust locking mechanism is provided. An easier and less time-consuming locking of the spring break protection mechanism may be further be achieved.

[0040] According to a third aspect there is provided a kit of parts for locking a ratchet wheel of a spring break protection mechanism during installation of a balancing spring in a sectional door system, the kit of parts comprising: a locking mechanism comprising: a locking member arranged to removably engage with the ratchet wheel; and a locking arrangement arranged to removable fixate the locking member to a base plate of the spring break protection mechanism such that the spring break protection mechanism is locked thereby hindering the ratchet wheel from rotating while the balancing spring is tensioned.

[0041] Effects and features of the third aspect are to a large extent analogous to those described above in connection with the first and second aspects. Examples mentioned in relation to the first and / or second aspects are largely compatible with the third aspect. According to some examples, the kit of parts may comprise the spring break protection mechanism.

[0042] The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred examples of the disclosure by way of illustration only. Those skilled in the art understand from guidance in the detailed description that changes and modifications may be made within the scope of the disclosure.

[0043] Hence, it is to be understood that the herein disclosed disclosure is not limited to the particular component parts of the device described or steps of the methods described since such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular examples only, and is not intended to be limiting. It should be noted that, as used in the specification and the appended claim, the articles "a", "an", "the", and "said" are intended to mean that there are one or more of the elements unless the context explicitly dictates otherwise. Thus, for example, reference to "a unit" or "the unit" may include several devices, and the like. Furthermore, the words "comprising", "including", "containing" and similar wordings does not exclude other elements or steps.

[0044] It may further be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0045] Brief descriptions of the drawings

[0046] The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings.

[0047] Figures la and lb show perspective views of an assembly according to an example of the present disclosure.

[0048] Figure 2 further shows a side view of an assembly according to an example of the present disclosure. Figure 3 shows a perspective view of an assembly according to an example of the present disclosure.

[0049] Figure 4 shows a perspective view of parts of an assembly according to an example of the present disclosure.

[0050] Figure 5 shows a perspective view of an assembly according to an example of the present disclosure.

[0051] Figure 6 illustrates a flow chart showing a method for tensioning a balancing spring of a sectional door system while assembling the sectional door system according to some examples of the present disclosure.

[0052] Figures 7a to 7c show different views of an assembly according to an example of the present disclosure.

[0053] Figures 8a and 8b show different views of parts of a sectional door system according to an example of the present disclosure.

[0054] Figures 9a and 9b show different views of an assembly according to an example of the present disclosure.

[0055] Detailed description

[0056] The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the disclosure are shown. The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person.

[0057] Figures la and lb show perspective views of an assembly 100 according to an example. Figure 2 further shows a side view of the assembly 100. With reference to Figures 1 and 2, the assembly 100 comprises a spring break protection mechanism 102 and a spring plug 104 for connecting a balancing spring 106 to the spring break protection mechanism 102. The balancing spring is 106 is arranged to balance a sectional door system 200 as is described below and illustrated in Figure 8. The balancing spring 106 may be a torsion spring. The assembly 100 further comprises a locking mechanism 108 for locking the spring break protection mechanism 102 while tensioning the balancing spring 106. The tensioning of balancing spring 106 is to achieve a balancing force for compensating the weight of the door segment of a sectional door thereby balancing the sectional door.

[0058] The spring break protection mechanism 102 comprises: a base plate 110 arranged for connection to the fixed world, e.g. a wall. The base plate 110 may have the form of a L-profile as exemplified in Figures 1 and 2.

[0059] The base plate 110 comprises an opening 112 for receiving a balancing axle 114 of the sectional door system (not shown). The opening 112 may be a through hole.

[0060] The spring break protection mechanism 102 comprises a ratchet wheel 116 which is rotatably arranged at a first side Illa of the base plate 110. The ratchet wheel 116 is arranged to cooperate with the balancing axle 114, see Figures la and lb.

[0061] The ratchet wheel 116 may be rotatably arranged to the first side Illa by a bearing 103. The ratchet wheel 116 may comprise a hole 117 for receiving a balancing axle 114 of a sectional door system (not shown). The ratchet wheel 116 may be arranged to cooperate with the balancing axle 114, e.g. it can be coupled to a balancing axle 114 having a coaxial groove which cooperated with a pin 119, see Figure 2.

[0062] The spring break protection mechanism 102 comprises a pawl 118 pivotably connected to the base plate 110 at the first side thereof Illa. The pawl 118 is pivotable between a first position, in which the ratchet wheel 116 is free-running, and a second position in which the pawl 118 blocks the ratchet wheel 116. The spring break protection mechanism further comprises an extension 120 attached to the pawl 118 and extending from the pawl 118 to beyond a second side 111b of the base plate 110.

[0063] The base plate 110 and the spring plug 104 are arranged for bayonet mount interaction with each other, wherein upon the spring plug 104 is placed against the second side 111b of the base plate 110 and then rotated in a first direction for bayonet connection, part of the spring plug 104 thereby pushes the extension 120 so as to force the pawl 118 in the first position. Upon the spring plug 104 is then rotated in a second direction opposite to the first direction, the pawl 118 moves into the second position, to block the ratchet wheel 116 so as to avoid rotation of the balancing axle 114. For achieving the bayonet mount interaction, the base plate 110 may further comprise: a first and second hook 113a, 113b arranged at the second side 111b of the base plate 110, see Figure 2, for bayonet mount interaction with the spring plug 104. The spring plug 104 comprises a connection member 105 for connecting the balancing spring 106 and a blade 107 arranged at an outer end of the connection member 105 and extending away from a central axis 109 of the connection member 105 into two opposing directions. The blade having two blade portions 107a, 107b.

[0064] The connection member 105 may comprise threaded grooves arranged to interact with an internal surface of a balancing spring 106.

[0065] The hooks 113a, 113b, extend from the base plate 110. One or more of the hooks 113a, 113b, may have an L-shaped form.

[0066] The bearing 103 may be ring shaped. The bearing 103 may extend out of a main plane of the base plate 110 at the second side 111b. When placed against the base plate 110, the spring plug 104 may be positioned around the ring-shaped bearing 103 and rotated around bearing 103. The spring plug 104 may be rotated around its axis until the blades 107a, 107b meet the hooks 113a, 103b, respectively. In use the blades 107a, 107b will be forced against the hooks 113a, 103b by a torsion force of the biased balancing spring 106 attached to the spring plug 104.

[0067] With further reference to Figures 1 and 2, the locking mechanism 108 may comprise a locking member 122. The locking member 122 is arranged to removably engage with the ratchet wheel 116, see Figure lb. A locking arrangement 124 is arranged to removable fixate the locking member 122 to the base plate 110 such that the spring break protection mechanism 102 is locked. The locking mechanism 108 thereby hinders the ratchet wheel 116 from rotating while the balancing spring 106 is tensioned.

[0068] The locking member 122 may have an engagement opening 126 with engagement portions 128 arranged to removable engage with teeth 130 of the ratchet wheel 116, see Figure 2. The locking member 122 may be arranged such that it is slidably movable, as illustrated by the arrow 123 in Figure la, along the ratchet wheel 116 in a direction perpendicular to the rotation direction 115 of the ratchet wheel 116. The direction perpendicular to the rotation direction 115 of the ratchet wheel 116 may be aligned with the central axis 109 of the balancing axle 114 is inserted inside the opening 112. The locking member 122 may be slidably movable 123 along the longitudinal axis of the balancing axle 114. The longitudinal axis may be understood as the central axis 109. The locking member 122 may slidably movable 123 along a direction along the axis of the balancing axle 114 when attached to the to the spring break protection mechanism 102. The slidably movable may be understood as the locking member 122 being arranged to be slided translationally along the balancing axle 114 from a first position to a second position on the balancing axle 114. Thus, the locking member 122 is arranged to slide along the balancing axle 114. The locking member 122 may, moreover, be slidably movable along the ratchet wheel 116 in a direction perpendicular to the rotation axis of the ratchet wheel 116.

[0069] The locking arrangement 124 may be a screw and nut arrangement 132, see for example Figure la. The screw and nut arrangement 132 is shown in an exploded view in Figure la illustrating an unlocked state. In Figure lb, the screw and nut arrangement 132 is shown in a locked state, i.e. when the screw 132a is tightened to the nut 132b. The screw and nut arrangement 132 may comprise one or more washers 132c. The one or more washers 132c may be arranged to provide spacing between the screw 132a and the nut 132b. The spacing may be that of the thickness on the base plate 110, i.e. the distance between the first and the second sides Illa, 111b of the base plate 110. The one or more washers 132c may be arranged to clamp the base plate 110. An edge portion 136 of the base plate 110 may be clamped by the locking arrangement 124.

[0070] The locking member 122 may further comprise a through hole 134 and wherein the locking arrangement 124 is arranged to extend through the through hole 134 and to clamp the edge portion 136 of the base plate 110, thereby locking the spring break protection mechanism 102 while tensioning the balancing spring 106. This is illustrated for example in Figures 1 and 2.

[0071] Figure 3 illustrates that the locking member 122 comprises a through hole 134 and the base plate 110 comprises a complementary through hole 138, wherein the locking arrangement 124 is arranged to extend through the through holes 134, 138, thereby locking the spring break protection mechanism 102 while tensioning the balancing spring 106.

[0072] The base plate 110 may further comprises a second opening 140, see for example Figures lb or 3, or an indentation, through which the extension 120 is extending from the pawl 118 to the second side of the base plate 110. Figure 4 illustrates parts of an assembly 100 and Figure 5 illustrate an assembly according to some examples. With reference to Figures 4 and 5, it is exemplified that the balancing axle 114 may be arranged to hold the balancing spring 106. Figure 4 further exemplifies that the balancing spring 106 and the spring plug 104 may be coaxially arranged around the balancing axle 114. The balancing spring 106 may be a torsion spring.

[0073] The tensioned balancing spring 106 may be fixed to the balancing axle 114 at a fixation point 142 on the balancing axle 114. The fixation may be by a tightened screw or bolt. The fixation may be arranged at a distal end of the balancing spring 106, the distal end being opposite in an axial direction to the side of the balancing spring 106 having the spring plug 104.

[0074] The balancing spring 106 may be tensioned by a rotational motion 144 relative to the spring break protection mechanism 102.

[0075] The balancing spring 106 may comprise one or more grooves 146 arranged to receive a rope or cable (not shown). The rope or cable may form part of a hoisting arrangement (not shown), the hoisting system may be arranged to raise a sectional door of the sectional door system. To this end, a pulley 156 of the hoisting arrangement may be arranged around the balancing axle 114, see Figure 8.

[0076] With further reference to Figure 2, the looking member 122 may have the form of a disc or plate. The locking member 122 may have a head portion 148 arranged to removably engage with the ratchet wheel 116. The head portion 148 may have the engagement opening 126. The locking member 122 may further have a shaft or handle 150 arranged to facilitate the handling and / or engaging of the locking member 122 to the ratchet wheel 116. The engagement opening 126 may be understood to have a profile 152. The profile 152 may be arranged to match the outer contours of the ratchet wheel 116. Put differently, the profile 152 may be arranged to engage with one or more of the teeth 130 of the ratchet wheel 116.

[0077] The locking member 122 may have a slot 154. The slot 154 may be arranged in the head portion 148. The slot 154 may extend from the edge of the locking member 122 to the engagement opening 126. The locking member 122 may thereby be C-shaped. The slot 154 may be arranged in the head portion 148. The slot 154 may have a width larger than that of the balancing axle 114 allowing the locking member 122 to be positioned around or removed from the balancing axle 114. Figure 6 illustrates a flow chart showing a method 300 for tensioning a balancing spring 106 of a sectional door system 200 while assembling the sectional door system 200 according to some examples.

[0078] Figures 7a to 7c show different views of an assembly 100 according to an example of the present disclosure.

[0079] Figure 8a and 8b show different views of parts of a sectional door system 200 according to an example of the present disclosure.

[0080] Figures 9a and 9b show different views of an assembly according to an example of the present disclosure.

[0081] With reference to Figures 4 to 9 the method 300 is described. The method 300 comprises assembling 302 the assembly 100, as described above and illustrated for example in Figures 4 and 7a.

[0082] The method 300 further comprises: engaging 304 the spring plug 104 for connecting the balancing spring 106 of the sectional door system 200 and the base plate 110 of the spring break protection mechanism 102 in a bayonet mount interaction with each other such that the spring plug 104 is placed against the second side of the base plate 110 and then rotated 306 in a first direction for bayonet connection, part of the spring plug 104 thereby pushes the extension 120 so as to force the pawl 118 in the first position, see for example Figure 7b; engaging 308 the locking member 122 of the locking mechanism 108 with the ratchet wheel 116 and removably fixating 310 the locking member 122 to the base plate 110 thereby hindering the ratchet wheel 116 from rotating, see for example Figures 7a and 7b; tensioning 312 the balancing spring 106 while the locking member 122 is fixed to the base plate 110, see for example Figure 7c; locking 314 the tensioned balancing spring 106 to the balancing axle 114 see for example Figure 7c; loading 316 the balancing spring 106 by attaching 318 sections 202 of the sectional door system 200, see for example Figure 8b; removing 320 the locking mechanism 108 such that the ratchet wheel 116 is free to rotate, see Figure 9a and 9b. The locking 314 of the tensioned balancing spring 106 may be by fixating the balancing spring 106 to the balancing axle 114 at a fixation point 142 on the balancing axle 114.

[0083] The engaging 308 of the locking member 122 of the locking mechanism 108 with the ratchet wheel 116 may be by slidably moving 309 the locking member 122 along the ratchet wheel 116 in a direction perpendicular to the rotation direction of the ratchet wheel 116. The direction of the moving may be towards the base plate 110, i.e. towards the first side of the base plate 110.

[0084] Complementary, the removing 320 of the locking mechanism 108 may be by slidably removing 322 the locking member 122 along the ratchet wheel 116 in a direction perpendicular to the rotation direction of the ratchet wheel 116. The direction of the removing may be away from the base plate 110.

[0085] The ratchet wheel 116 may comprise teeth 130 and the locking member 122 has an engagement opening 126 with engagement portions 128, and wherein the engaging 308 of the locking member 122 with the ratchet wheel 116 may be by engaging teeth 130 with engagement portions 128.

[0086] The removably fixating 310 of the locking member 122 to the base plate 110 may be by locking a screw and nut arrangement 132.

[0087] The locking member 122 may comprises a through hole 134 and wherein the method 300 comprises removably fixating 310 the locking member 122 to the base plate 110 by arranging 311a the locking arrangement 124 to extend through the through hole 134 and clamping 311b an edge portion 136 of the base plate 110.

[0088] The third aspect of this disclosure shows a kit of parts for locking a ratchet wheel of a spring break protection mechanism during installation of a balancing spring in a sectional door system. The kit of parts 400 is illustrated for example in Figure 7a. The kit of parts 400 comprising: a locking mechanism 108 comprising: a locking member 122 arranged to removably engage with the ratchet wheel 116; and a locking arrangement 124 arranged to removable fixate the locking member 122 to a base plate 110 of the spring break protection mechanism 102 such that the spring break protection mechanism 102 is locked thereby hindering the ratchet wheel 116 from rotating while the balancing spring 106 is tensioned.

[0089] The kit of parts 400 may further comprise the spring break protection mechanism 102. The installing of the sectional door system may comprise using one or more blocks 204 arranged below a lower section 203 of the sections 202 of a door leaf 201, i.e. the section being closet to the floor 206, see Figure 8b. The use of one or more blocks 204 allows for controlling the tension on the locking mechanism 108 while installing the sectional door system 200. By removing the one or more blocks 204 the tension on the blocking mechanism 108 may be reduced indicated by the arrow 158 in Figure 7b.

[0090] The person skilled in the art realizes that the present disclosure is not limited to the preferred embodiments described above. The person skilled in the art further realizes that modifications and variations are possible within the scope of the appended claims. Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims.

Claims

CLAIMS1. An assembly (100) comprising a spring break protection mechanism (102), a spring plug (104) for connecting a balancing spring (106) of a sectional door system (200) to the spring break protection mechanism (102), and a locking mechanism (108) for locking the spring break protection mechanism (102) while tensioning the balancing spring (106), the spring break protection mechanism (102) comprising: a base plate (110) arranged for connection to the fixed world, and comprising an opening (112) for receiving a balancing axle (114) of the sectional door system (200), a ratchet wheel (116) rotatably arranged at a first side of the base plate (110), the ratchet wheel (116) being arranged to cooperate with the balancing axle (114); a pawl (118) pivotably connected to the base plate (110) at the first side thereof, wherein the pawl (118) is pivotable between a first position, in which the ratchet wheel (116) is free-running, and a second position in which the pawl (118) blocks the ratchet wheel (116); an extension (120) attached to the pawl (118) and extending from the pawl (118) to beyond a second side of the base plate (110), wherein the base plate (110) and the spring plug (104) are arranged for bayonet mount interaction with each other, wherein upon the spring plug (104) is placed against the second side of the base plate (110) and then rotated in a first direction for bayonet connection, part of the spring plug (104) thereby pushes the extension (120) so as to force the pawl (118) in the first position; and upon the spring plug (104) is then rotated in a second direction opposite to the first direction, the pawl (118) moves into the second position, to block the ratchet wheel (116) so as to avoid rotation of the balancing axle (114), wherein the locking mechanism (108) comprises: a locking member (122) arranged to removably engage with the ratchet wheel (116); and a locking arrangement (124) arranged to removable fixate the locking member (122) to the base plate (110) such that the spring break protection mechanism (102) is locked thereby hindering the ratchet wheel (116) from rotating while the balancing spring (106) is tensioned.

2. The assembly according to claim 1, wherein the locking member (122) has an engagement opening (126) with engagement portions (128) arranged to removable engage with teeth (130) of the ratchet wheel (116).

3. The assembly according to claim 1 or 2, wherein the locking member (122) is arranged such that it is slidably movable along the ratchet wheel (116) in a direction perpendicular to the rotation direction of the ratchet wheel (116).

4. The assembly according to any one of claims 1 to 3, wherein the locking arrangement (124) is a screw and nut arrangement (132).

5. The assembly according to any one of claims 1 to 4, wherein the locking member (122) comprises a through hole (134) and wherein the locking arrangement (124) is arranged to extend through the through hole (134) and to clamp an edge portion (136) of the base plate (110), thereby locking the spring break protection mechanism (102) while tensioning the balancing spring (106).

6. The assembly according to any one of claims 1 to 4, wherein the locking member (122) comprises a through hole (134) and the base plate (110) comprises a complementary through hole (138), wherein the locking arrangement (124) is arranged to extend through the through holes (134,138), thereby locking the spring break protection mechanism (102) while tensioning the balancing spring (106).

7. The assembly according to any one of claims 1 to 6, wherein the balancing spring (106) is a torsion spring.

8. The assembly according to any one of claims 1 to 7, wherein the base plate (110) further comprises a second opening (140) or an indentation, through which the extension (120) is extending from the pawl (118) to the second side of the base plate (110).

9. A method for tensioning a balancing spring (106) of a sectional door system (200) while assembling the sectional door system (200), the method (300) comprising: assembling (302) the assembly (100) according to any one of the claims 1 to 8; engaging (304) the spring plug (104) for connecting the balancing spring (106) of the sectional door system (200) and the base plate (110) of the spring break protection mechanism (102) in a bayonet mount interaction with each other such that the spring plug (104) is placed against the second side of the base plate (110) and then rotated (306) in a first direction for bayonet connection, part of the spring plug (104) thereby pushes the extension (120) so as to force the pawl (118) in the first position;engaging (308) the locking member (122) of the locking mechanism (108) with the ratchet wheel (116) and removably fixating (310) the locking member (122) to the base plate (110) thereby hindering the ratchet wheel (116) from rotating; tensioning (312) the balancing spring (106) while the locking member (122) is fixed to the base plate (110); locking (314) the tensioned balancing spring (106) to the balancing axle (114); loading (316) the balancing spring (106) by attaching (318) sections (202) of the sectional door system (200); removing (320) the locking mechanism (108) such that the ratchet wheel (116) is free to rotate.

10. The method according to claim 9, wherein the locking (314) of the tensioned balancing spring (106) is by fixating the balancing spring (106) to the balancing axle (114) at a fixation point (142) on the balancing axle (114).

11. The method according to claim 9 or 10, wherein the engaging (308) the locking member (122) of the locking mechanism (108) with the ratchet wheel (116) is by slidably moving (309) the locking member (122) along the ratchet wheel (116) in a direction perpendicular to the rotation direction of the ratchet wheel (116).

12. The method according to any one of claims 9 to 11, wherein the ratchet wheel (116) comprises teeth (130) and the locking member (122) has an engagement opening (126) with engagement portions (128), and wherein the engaging (308) of the locking member (122) with the ratchet wheel (116) is by engaging teeth (130) with engagement portions (128).

13. The method according to any one of claims 9 to 12, wherein the removably fixating (310) of the locking member (122) to the base plate (110) is by locking a screw and nut arrangement (132).

14. The method according to any one of claims 9 to 13, wherein the locking member (122) comprises a through hole (134) and wherein the method (300) comprises removably fixating (310) the locking member (122) to the base plate (110) by arranging (311a) the locking arrangement (124) to extend through the through hole (134) and clamping (311b) an edge portion (136) of the base plate (110).

15. A kit of parts for locking a ratchet wheel of a spring break protection mechanism during installation of a balancing spring in a sectional door system, the kit of parts (400) comprising: a locking mechanism (108) comprising: a locking member (122) arranged to removably engage with the ratchet wheel (116); and a locking arrangement (124) arranged to removable fixate the locking member (122) to a base plate (110) of the spring break protection mechanism (102) such that the spring break protection mechanism (102) is locked thereby hindering the ratchet wheel (116) from rotating while the balancing spring (106) is tensioned.

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