REFERENCE TO RELATED APPLICATION

[0001] This application claims pnority to US Applic. No. 63/053,300, which was filed on July 17, 2020. The contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

[0002] The invention relates generally to bi-fold overhead doors. More particularly, the invention relates to bi-fold overhead door with a concealed hydraulic cylinder.

BACKGROUND OF THE INVENTION

[0003] Overhead doors are commonly used to provide relatively large openings such as in machine sheds, bams and airplane hangars. The overhead doors typically utilize a hydraulic cylinder or electric actuators to assist with moving the door leaf between open and closed configurations. An example of one such overhead door system is described in U.S. Patent Publication No. 2011/0225895, which is assigned to the assignee of this application.

SUMMARY OF THE INVENTION

[0004] An embodiment of the invention is directed to a bi-fold overhead door system that includes a frame, a bi-fold door and a first hydraulic cylinder. The bi-fold overhead door has an upper door leaf and a lower door leaf. The upper door leaf is pivotally mounted to the frame. The lower door leaf is pivotally mounted to the upper door leaf. The first hydraulic cylinder has a first cylinder end and a second cylinder end. The first cylinder end is operably attached to the frame. The second cylinder end is operably attached to the upper door leaf. The first hydraulic cylinder is capable of moving the bi-fold overhead door between a closed configuration and an open configuration. At least one of the frame and the upper door leaf have a slot formed therein. When the bi-fold overhead door is in the closed configuration, the first hydraulic cylinder is substantially recessed in the slot.

[0005] Another embodiment of the invention is directed to a bi-fold overhead door that includes an upper door leaf, a lower door leaf and a first hydraulic cylinder. The upper door leaf is pivotally mounted to the frame. The upper door leaf has a slot formed therein. The lower door leaf is pivotally mounted to the upper door leaf. The first hydraulic cylinder has a first cylinder end and a second cylinder end. The second cylinder end is operably attached to the upper door leaf. The first hydraulic cylinder is capable of moving the bi-fold overhead door between a closed configuration and an open configuration. When the bi-fold overhead door is in the closed configuration, the first hydraulic cylinder is substantially recessed in the slot.

[0006] Another embodiment of the invention is directed to a method of operating a bifold overhead door. An upper door leaf is pivotally mounted with respect to a frame. A lower door leaf is pivotally mounted with respect to the upper door leaf. At least one of the frame and the upper door leaf has a slot formed therein. The upper door leaf is operably attached to the frame with a first hydraulic cylinder. The bi-fold overhead door is moved between a closed configuration and an open configuration using a first hydraulic cylinder that is attached to the upper door leaf and the frame. The first hydraulic cylinder is substantially recessed in the slot when the bi-fold overhead door is in the closed configuration.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain principles of embodiments. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

[0008] Fig. 1 is an inside elevation view of the bi-fold overhead door with a concealed hydraulic cylinder according to an embodiment of the invention where the bi-fold overhead door is in a closed configuration.

[0009] Fig. 2 is a side view of the bi-fold overhead door in the closed configuration.

[0010] Fig. 3 is a side view of the bi-fold overhead door in an open configuration.

[0011] Fig. 4 is a perspective view of the bi-fold overhead door in the open configuration with door panels removed so that frame elements can be better visualized.

[0012] Fig. 5 is a perspective view of an upper portion of a slot in a side frame member of the bi-fold overhead door with the concealed hydraulic cylinder.

[0013] Fig. 6 is a perspective view of a lower portion of the slot in the side frame member.

[0014] Fig. 7 is a partially in phantom perspective view illustrating engagement of a lower end of a lower door leaf to the side frame member when the bi-fold overhead door is in the open configuration.

[0015] Fig. 8 is a side view illustrating the lower end of the lower door leaf when the bi-fold overhead door is in the closed configuration.

DETAILED DESCRIPTION OF THE INVENTION

[0016] The invention generally includes a bi-fold overhead door 20 that is movable between a closed configuration illustrated in Figs. 1 and 2 and an open configuration illustrated in Figs. 3 and 4 utilizing at least one hydraulic cylinder 22. . In certain embodiments, the door leaf 32 is vertically pivotable between the open configuration and the closed configuration. The bi-fold overhead door 20 is particularly suited for use with a relatively wide bi-fold overhead door such as having a width of more than about 20 feet.

[0017] When the bi-fold overhead door 20 is in the closed configuration, the hydraulic cylinder 22 is substantially concealed. As used herein, concealed means that no portion of the hydraulic cylinder 22 extends past a side of the bi-fold overhead door that is opposite the door frame as illustrated in Fig. 2 and no portion of the hydraulic cylinder extends outside of the door frame 34 when the bi-fold overhead door is in the closed configuration as illustrated in Fig. 1.

[0018] Substantially concealing the hydraulic cylinder 22 when the bi-fold overhead door 20 is in the closed configuration not only enhances the aesthetics of the bi-fold overhead door 20 but also protects the hydraulic cylinder 22 from damage.

[0019] The bi-fold overhead door 20 generally includes an upper door leaf 30 and a lower door leaf 32, as illustrated in Figs. 1-4. In certain embodiments, the upper door leaf 30 and the lower door leaf 32 both have a generally rectangular or square configuration depending on the shape of the opening that is intended to be covered with the bi-fold overhead door 20. [0020] While it is illustrated that the upper door leaf 30 and the lower door leaf 32 have a similar height and width, it is possible for the upper door leaf 30 and the lower door leaf 32 to be formed with different heights and widths depending on the shape of the opening that is intended to be covered with the bi-fold overhead door 20.

[0021] The upper door leaf 30 generally includes an upper frame member 40, a lower frame member 42, a first side frame member 44 and a second side frame member 46. The first side frame member 44 extends between the upper frame member 40 and the lower frame member 42. The second side frame member 46 extends between the upper frame member 40 and the lower frame member 42.

[0022] Depending on the size of the upper door leaf 30, the upper door leaf 30 may include at least one intermediate support member 48 that extends between the upper frame member 40 and the lower frame member 42.

[0023] In certain embodiments, the side frame members 44, 46 may have a generally square profile that includes a first side 62, a second side 64, a third side 66 and a fourth side 68. The first side 62 is oriented towards the door frame. The second side 64, which is opposite the first side 62, is oriented away from the door frame.

[0024] The third side 66 extends between the first side 62 and the second side 64. The fourth side 68, which is opposite the third side 66, extends between the first side 62 and the second side 64. An opening is defined inside of the first side 62, the second side 64, the third side 66 and the fourth side 68.

[0025] The first side 62 may have a slot formed therein that is adapted to receive a portion of the at least one hydraulic cylinder 60. The slot extends through the first side 62 into the opening. The slot may have a generally elongated shape that is vertically oriented. The slot has a width that is greater than a width of the at least one hydraulic cylinder 60.

[0026] A person of skill in the art will appreciate that it is possible for the side frame members 44, 46 to have an alternative configuration with less than four sides. For example, in an alternative configuration, the side members 38 may have only two sides using the concepts of the invention.

[0027] The lower door leaf 32 generally includes an upper frame member 50, a lower frame member 52, a first side frame member 54 and a second side frame member 56. The first side frame member 54 extends between the upper frame member 50 and the lower frame member 52. The second side frame member 56 extends between the upper frame member 50 and the lower frame member 52.

[0028] Depending on the size of the lower door leaf 32, the lower door leaf 32 may include at least one intermediate support member 58 that extends between the upper frame member 50 and the lower frame member 52.

[0029] The upper door leaf 30 is pivotally attached to the lower door leaf 32 with at least one intermediate hinge 34. In certain embodiments, one of the intermediate hinges 34 is mounted proximate to each opposite side edge of the upper door leaf 30 and the lower door leaf 32.

[0030] The frame may include a top frame member 100, a first side frame member 102 and a second side frame member 104. The top frame member 100 may be formed with a generally square profile such as illustrated in Figs. 2 and 3. While Fig. 1 illustrates that the top frame member 100 extends substantially across the bi-fold overhead door 20, it is possible for the top frame member 100 to be formed in sections such as in locations where the upper hinges 36 are to be attached to the top frame member. The top frame member 100 may be oriented generally perpendicular to the first side frame member 102 and the second side frame member 104.

[0031] In certain embodiments, the side frame members 102, 104 may have a generally square profile that includes a first side 72, a second side 74, a third side 76 and a fourth side 78. The first side 72 is oriented towards the bi-fold overhead door. The second side 74, which is opposite the first side 72, is oriented away from the bi-fold overhead door.

[0032] The third side 76 extends between the first side 72 and the second side 74 towards an interior of the door frame. The fourth side 78, which is opposite the third side 76, extends between the first side 72 and the second side 74 away from an interior of the door frame. An opening is defined inside of the first side 72, the second side 74, the third side 76 and the fourth side 78.

[0033] The first side 72 has a slot 45 formed therein. The slot 45 extends through the first side 72 into the opening. The slot 45 may have a generally elongated shape that is vertically oriented. The slot 45 has a width that is greater than a width of the at least one hydraulic cylinder 22.

[0034] A person of skill in the art will appreciate that it is possible for the side frame member 102, 104 to have an alternative configuration with less than four sides. For example, in an alternative configuration, the side frame member 102, 104 may have only two sides using the concepts of the invention.

[0035] The upper door leaf 30 may be pivotally attached to the top frame member 100 with at least one upper hinge 36. In certain embodiments, one of the upper hinges 36 is provided proximate opposite ends of the upper door leaf 30. Depending on the width of the upper door leaf 30, there may be at least one central upper hinge 36. Alternatively, the upper door leaf 30 may be pivotally attached to the first side member 102 and the second side member 104.

[0036] In certain embodiments, the top frame member 100 is mounted to the structure

(not shown) in a generally horizontal orientation. However, a person of skill in the art will appreciate that it is possible for the top frame member 100 to be mounted in different orientations.

[0037] Similar to the top frame member 100, the first side frame member 102 may be formed with a generally square profile. In certain embodiments, the first side frame member 102 is mounted proximate a first end of the top frame member 100 and extends in a generally vertical orientation from an upper end of the upper door leaf 30 to a lower end of the lower door leaf 32. [0038] The first side frame member 102 has a slot 110 formed therein as illustrated in

Fig. 4. Proximate an upper end of the first side frame member 102, the slot 110a has a width that is slightly wider than a width of the hydraulic cylinder 22 as illustrated in Fig. 5. Proximate a lower end of the first side frame member 102, the slot 110b, which is illustrated in Fig. 6, has a width that is narrower than the width of the hydraulic cylinder 22 but that is wider than a linkage arm 110, which is discussed in more detail herein.

[0039] The slot 110 transitions from the wider width to the narrower width at a point that is sufficiently lower such that the hydraulic cylinder 22 does not contact the first side frame member 102 when the bi-fold overhead door 20 is in the closed configuration as illustrated in Fig. 2.

[0040] Similar to the first side frame member 102, the first side frame member 44 has a slot 45 formed therein that is adapted to receive a portion of the hydraulic cylinder 22 when the bi-fold overhead door 20 is in the closed configuration. The slot 45 has a width that is slightly wider than the width of the hydraulic cylinder 22.

[0041] The first end of the hydraulic cylinder 22 may be mounted inside of the first side frame member 102 proximate the wider slot 110a, as illustrated in Fig. 4. The second end of the hydraulic cylinder may be mounted inside of the first side frame member 44 proximate the slot 45 formed therein. This configuration enables the hydraulic cylinder 22 to be concealed partially inside of the first side frame member 102 and partially inside of the first side frame member 44 when the bi-fold overhead door 20 is in the closed configuration.

[0042] Proximate a lower end of the lower door leaf 32, a guide wheel assembly is provided to maintain the lower end of the lower door leaf 32 adjacent to the first side frame member 102 such as illustrated in Figs. 2 and 3 and the bi-fold overhead door 20 moves between the open and closed configurations. [0043] The guide wheel assembly includes a linkage arm 80 that is pivotally mounted to the side frame member 54 for pivoting about an axle 82 as illustrated in Figs. 7 and 8. A shaft 84 is attached to an end of the linkage arm 80 that is opposite the axle 82. At least one roller 86 is rotatably mounted to the shaft 84. In certain embodiments, there are 2 rollers 86 attached to opposite ends of the shaft 84.

[0044] The linkage arm 80 extends through the slot 110 as illustrated in Fig. 7. The rollers 86 are mounted to the shaft 84 at a width that is greater than the width of the slot 110. This configuration causes the rollers to be retained inside of the first side frame member 102 as the bi-fold overhead door 20 is moved between the open and closed configurations.

[0045] As the bi-fold overhead door 20 approaches the closed configuration, which is illustrated in Fig. 8, the rollers 86 contact a stopper block 88 mounted at the lower end of the first side frame member 102. The stopper block 88 pulls the lower door leaf 32 towards the first side frame member 102 to reduce the potential of water leaking between the lower door leaf 32 and the first side frame member 102.

[0046] In the preceding detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as "top," “bottom,” “front,” “back,” “leading,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The preceding detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. [0047] It is contemplated that features disclosed in this application, as well as those described in the above applications incorporated by reference, can be mixed and matched to suit particular circumstances. Various other modifications and changes will be apparent to those of ordinary skill.