US-20260125907-A1 - ATTIC STAIRS

US20260125907A1US 20260125907 A1US20260125907 A1US 20260125907A1US-20260125907-A1

Abstract

Attic stairs include: a frame assembly; a door panel assembly, movably mounted below side plates, where the door panel assembly includes a door panel and a fixed frame, and the fixed frame is fixedly mounted on the door panel; a plurality of adjustment members, mounted on two sides of the fixed frame; an attic stair assembly, including a plurality of foldable stair segments, where a lowermost stair segment is mounted on the adjustment members, and a distance between the lowermost stair segment and the door panel is adjusted along the adjustment members; and a hinge assembly, including two unfolding hinge mechanisms and two limiting hinge mechanisms. The two unfolding hinge mechanisms allow the door panel to rotate downward along a side of the unfolding hinge mechanisms to be opened and closed. The two limiting hinge mechanisms are configured to limit the unfolding angle of the door panel.

Inventors

Kunjie Wang

Assignees

Sj industries Inc.

Dates

Publication Date: 20260507
Application Date: 20241107

Claims (16)

1 . Attic stairs, comprising: a frame assembly, comprising a plurality of side plates, wherein the plurality of side plates successively enclose an accommodation space; a door panel assembly, movably mounted below the plurality of side plates, wherein the door panel assembly comprises a door panel and a fixed frame, and the fixed frame is fixedly mounted on the door panel; a plurality of adjustment members, mounted on two sides of the fixed frame; an attic stair assembly, comprising a plurality of foldable stair segments, wherein a lowermost stair segment of the plurality of foldable stair segments is mounted on the plurality of adjustment members, a distance between the lowermost stair segment and the door panel is adjusted along the plurality of adjustment members, and the attic stair assembly is allowed to be accommodated in the accommodation space; and a hinge assembly, comprising two unfolding hinge mechanisms and two limiting hinge mechanisms, wherein first ends of the two unfolding hinge mechanisms are respectively arranged at end portions of two sides of the fixed frame, and second ends of the two unfolding hinge mechanisms are connected to end portions of inner sides of two side plates of the plurality of side plates, so that the door panel is allowed to rotate downward along a side of the two unfolding hinge mechanisms to be opened and closed; first ends of the two limiting hinge mechanisms are respectively arranged at a middle of the fixed frame, and second ends of the two limiting hinge mechanisms are connected to middles of the inner sides of the two side plates for limiting an unfolding angle of the door panel.
2 . The attic stairs according to claim 1 , further comprising an elastic member, wherein a first end of the elastic member is connected to each of the two limiting hinge mechanisms, and a second end of the elastic member is connected to each of the end portions of of the two side plates.
3 . The attic stairs according to claim 1 , wherein each of the two unfolding hinge mechanisms comprises a first fixing member, a first connection rod, a second connection rod, and a second fixing member; the first fixing member is fixed to each of the end portions of the inner sides of the two side plates, and the first fixing member is arranged parallel to a length direction of each of the two side plates; the second fixing member is fixed to an end portion of the fixed frame, and the second fixing member is arranged parallel to a length direction of the door panel; and two ends of the first connection rod are hingedly connected to a first end of the first fixing member and a first end of the second fixing member, respectively, and two ends of the second connection rod are hingedly connected to a second end of the first fixing member and a second end of the second fixing member, respectively, so that the first fixing member, the first connection rod, the second connection rod and the second fixing member are connected to form a quadrangle.
4 . The attic stairs according to claim 1 , wherein each of the two limiting hinge mechanisms comprises a lower connection rod, an upper connection rod, a connection piece, a first hinge arm and a second hinge arm, wherein the connection piece is rotatably connected to each of the middles of the inner sides of the two side plates; and a first end of the lower connection rod is hinged to the middle of the fixed frame, and a second end of the lower connection rod is hingedly connected to a first end of the upper connection rod; a second end of the upper connection rod is fixed to a first end of the connection piece, and a second end of the connection piece is hingedly connected to a first end of the first hinge arm; a second end of the first hinge arm is hinged to a first end of the second hinge arm, and a second end of the second hinge arm is connected to an elastic member.
5 . The attic stairs according to claim 4 , wherein each of the two limiting hinge mechanisms further comprises a limiting seat, wherein the limiting seat is fixed to each of the middles of the inner sides of the two side plates, and a limiting step is arranged on the limiting seat; the connection piece is rotatably connected to the limiting seat through a pin shaft, and an end portion of the connection piece is limited at the limiting step.
6 . The attic stairs according to claim 1 , wherein each of the plurality of adjustment members comprises a connection plate and a fastening member, wherein an end of the connection plate is fixed to the fixed frame, and an adjustment groove is formed in the connection plate; a first adjustment end and a second adjustment end are at least arranged on the adjustment groove; a distance between the first adjustment end and the door panel is smaller than a distance between the second adjustment end and the door panel; and the fastening member mounts the lowermost stair segment on the first adjustment end or the second adjustment end.
7 . The attic stairs according to claim 6 , wherein the adjustment groove is L-shaped.
8 . The attic stairs according to claim 6 , wherein when the fastening member mounts the lowermost stair segment on the first adjustment end, the lowermost stair segment is in contact with the fixed frame.
9 . The attic stairs according to claim 3 , wherein two protruding portions are arranged on the first fixing member, and the two protruding portions are located at a hinge joint of the first connection rod and the second connection rod.
10 . The attic stairs according to claim 9 , wherein the second fixing member is a slot frame, and the slot frame is formed by connecting an upper side frame, a connection frame and a lower side frame in sequence; the upper side frame and the lower side frame are clamped on the fixed frame, and the first connection rod and the second connection rod are hingedly connected to the connection frame.
11 . The attic stairs according to claim 4 , wherein the connection piece comprises a first connection plate and a second connection plate, wherein the upper connection rod and the first hinge arm are arranged between the first connection plate and the second connection plate.
12 . The attic stairs according to claim 1 , wherein the fixed frame is formed by connecting four square pipes in sequence.
13 . The attic stairs according to claim 1 , wherein a low end of the door panel is provided with a pull rope.
14 . The attic stairs according to claim 1 , wherein the plurality of adjustment members comprise four adjustment members, wherein the four adjustment members are respectively located at two end portions of two sides of the door panel.
15 . The attic stairs according to claim 1 , further comprising a handrail, wherein the handrail is fixed to a side end of the lowermost stair segment, to the fixed frame, or to the plurality of adjustment members.
16 . The attic stairs according to claim 1 , further comprising a sealing strip, wherein a lower end of each of the plurality of side plates is provided with a notch for mounting a door panel; a sealing step is arranged on the notch, and the sealing strip is mounted on the sealing step; the door panel is folded in the notch of the frame assembly, and an upper surface of the door panel is in tight contact with the sealing strip.

Description

TECHNICAL FIELD The present invention relates to the technical field of stairs, in particular to attic stairs. BACKGROUND A top-mounted folding stair, also known as a top-mounted telescopic ladder, can be folded up, hidden, and mounted in the ceiling after use. It does not occupy ground space and saves more activity space compared with existing stairs, and is thus suitable for attic use. Chinese patent application with publication number of CN102753770A discloses a foldable ladder, in particular a foldable ladder embedded in a frame, including a frame embedded horizontally in a ceiling of a building, where walls of the frame are relatively deep due to the thick ceiling or the need for the assumed wall to extend across the top surface of the ceiling. The frame can be closed from a bottom cover, and the cover is connected to the frame by a hinge mechanism and a pull rod construction that limits the opening amplitude of the cover. The ladder includes three sections, with the uppermost ladder fixed to the cover. In the above solution, since the ladder is fixed to the cover, there are the following problems: since the uppermost ladder is fixed to the cover, in order to leave an enough space for the foot to step on, a certain distance needs to be maintained from the cover, resulting in the height of the entire foldable ladder being relatively high, requiring a frame with a deeper wall thickness, and the overall height being large. Secondly, since the ladder is fixed, adjustment cannot be performed when there is a slight deviation in the distance between the ladder and the ground. SUMMARY An objective of the present invention is to provide attic stairs to realize the adjustability of the stair assembly and improve the convenience of transportation and use. To achieve the above objective, the present invention discloses attic stairs, including: a frame assembly, including a plurality of side plates, where the plurality of side plates successively enclose an accommodation space; a door panel assembly, movably mounted below the side plates, where the door panel assembly includes a door panel and a fixed frame, and the fixed frame is fixedly mounted on the door panel; a plurality of adjustment members, mounted on two sides of the fixed frame; an attic stair assembly, including a plurality of foldable stair segments, where a lowermost stair segment is mounted on the adjustment members, a distance between the lowermost stair segment and the door panel is adjusted along the adjustment members, and the attic stair assembly is allowed to be accommodated in the accommodation space; and a hinge assembly, including two unfolding hinge mechanisms and two limiting hinge mechanisms. Ends of the two unfolding hinge mechanisms are respectively arranged at end portions of two sides of the fixed frame, and the other ends of the unfolding hinge mechanisms are connected to end portions of inner sides of the side plates, so that the door panel is allowed to rotate downward along a side of the unfolding hinge mechanisms to be opened and closed. Ends of the two limiting hinge mechanisms are respectively arranged at the middle of the fixed frame, and the other ends of the limiting hinge mechanisms are connected to the middles of the inner sides of the side plates for limiting an unfolding angle of the door panel. Furthermore, the attic stairs further include an elastic member. One end of the elastic member is connected to the limiting hinge mechanism, and the other end of the elastic member is connected to an end portion of the side plate. By arranging the elastic member, under the action of the elastic member, the attic stairs can be returned into the frame assembly after being used. Preferably, the unfolding hinge mechanism includes a first fixing member, a first connection rod, a second connection rod, and a second fixing member. The first fixing member is fixed to the end portion of the inner side of the side plate, and is arranged parallel to a length direction of the side plate. The second fixing member is fixed to an end portion of the fixed frame, and is arranged parallel to a length direction of the door panel. Two ends of the first connection rod are hingedly connected to a first end of the first fixing member and a first end of the second fixing member, respectively, and two ends of the second connection rod are hingedly connected to a second end of the first fixing member and a second end of the second fixing member, respectively, so that the first fixing member, the first connection rod, the second connection rod and the second fixing member are connected to form a quadrangle. Preferably, the limiting hinge mechanism includes a lower connection rod, an upper connection rod, a connection piece, a first hinge arm and a second hinge arm. The connection piece is rotatably connected to the middle of the inner side of the side plate. One end of the lower connection rod is hinged to the middle of the fixed frame, and the other end o