JP3127879U - Connector and telescopic ladder using the connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extendable ladder that does not require the use of a tool such as a wrench and can reliably maintain a connected state.
A telescopic ladder 100 according to the present invention has two ladder bodies 110 and 120 each provided with a plurality of step plates 113 and 123 between side columns 111 and 112 or 121 and 122 arranged opposite to each other with a connecting tool 130. It is connected. The connection tool 130 includes a frame 131, a hole 112g formed in the side column 112, a rod-like body 134 that can be moved forward and backward in the hole 112g, and a wedge member 136. When the side pillars 112 and 122 are slid and the telescopic ladder 100 reaches a desired length, the wedge member 136 is slid to cause the side pillar 112 to be in pressure contact with the side pillar 122 so that the frame body and the side pillars are slid. And temporarily fix. Thereafter, the rod-like body 134 is inserted into the hole 112g, so that the connected state can be reliably maintained. In addition, tools such as a wrench are completely unnecessary.
[Selection] Figure 1

Description

  The present invention relates to a telescopic ladder and its connection tool.

  There is a telescopic ladder that uses a ladder body provided with a plurality of treads between side pillars arranged on the left and right sides and connected up and down. The upper and lower ladders can change the length of the ladders by overlapping the side pillars and sliding in the length direction. When such a ladder is used in a state of being extended to an arbitrary length, a configuration for maintaining the length is required.

  As a connection tool used for such a purpose, a hole is formed in each of the two side pillars, and when the holes of the two side pillars overlap, a rod-shaped connection tool is inserted and fixed. is there.

  However, with this method, the rod-shaped connector is easy to come off and lacks safety. Then, using a connection part bolt as a connecting tool which improved this is performed. This is because when a through hole is made in the front side column, a female screw hole is made in the back side column, and the ladder is extended to a desired length, each hole of the two side columns is The bolts are overlapped, and the bolts are threaded through the overlapped holes and fixed. By screwing the bolts tightly, it is possible to firmly connect the upper and lower ladders without worrying about coming off.

However, in order to tighten the bolt firmly with a wrench, the above-mentioned connection tool is inconvenient because a wrench is essential when using a ladder. In addition, it takes time to work to overlap the holes. The present invention has been conceived from such a situation, and it is not necessary to use a tool such as a spanner, and a connecting device that can easily and reliably maintain a connection state, and a telescopic ladder provided with the connecting device. The purpose is to provide.

  Furthermore, since the conventional telescopic ladders hold the overlapping state of the side pillars of the upper and lower ladder bodies only with the frame-shaped connecting tool, the connecting tool has to be made large and strong. An object of the present invention is to provide a telescopic ladder that can maintain an overlapping state of upper and lower ladder bodies without depending on a connection tool.

  In order to achieve the above-described object, the connector of the present invention is configured so that two ladder bodies each provided with a plurality of footboards are arranged between opposing side columns so that the side columns overlap with each other at least in the length direction. In addition, when the two ladder bodies reach a predetermined length by sliding and overlapping in a slidable manner in the length direction, the connecting tool for fixing two overlapping side pillars, The connector is fixed to one of the two side pillars stacked and has a frame having a portion facing the other side pillar, and a locked portion formed on the other side pillar. A locking portion that can be released, a wedge member that is slidably fitted between the other side column and the frame, and sliding the wedge member to place the other side column on the one side It has the operation part which temporarily fixes the said frame and a side pillar by press-contacting to a pillar, It is characterized by the above-mentioned.

  The locking part is made of a rod-like body that can freely advance and retract in a hole as a locked part, and a spiral groove is provided in one of the locking part and the frame, and a convex part that enters the spiral groove is provided in the other. A handle for rotating the rod-shaped body around its central axis is provided, and the rod-shaped body is moved back and forth by 1/4 to 3/4 rotation left and right by the handle, so that the rod-shaped body advances and retreats, and the locking portion and the covered portion are covered. It can be set as the structure which enabled locking / release with the latching | locking part.

  The locking part is made of a rod-shaped body that can freely advance and retract in a hole as a locked part, and a spiral surface is provided on one of the locking part and the frame, and a convex part that can contact the spiral surface is provided on the other side. , Provided with an elastic body that presses the convex portion against the spiral surface, and provided with a handle for rotating the rod-shaped body around its central axis, and the rod-shaped body is rotated 1/4 to 3/4 turn left and right by the handle. By doing so, the rod-shaped body may advance and retreat, and the locking portion and the locked portion can be locked and released.

  A long hole may be formed in the frame, and the operation part of the wedge member may pass through the long hole and the operation part may protrude outside the frame.

  The telescopic ladder of the present invention that achieves the above-mentioned object is a two-ladder body provided with a plurality of footboards between opposed side columns so that the side columns overlap with each other in a part in the length direction. An extendable ladder that connects two side pillars that overlap each other with a connecting tool when the two stacked ladder bodies reach a predetermined length, and is stretchable in the lengthwise direction. Is fixed to one of the two stacked side pillars and surrounds the other side pillar in at least two directions, a locked portion formed on the other side pillar, and the frame body. A locking portion which is provided and can be locked / released to the locked portion, a wedge member which is slidably provided between the other side column and the frame, and the wedge member is slid An operation portion that temporarily fixes the frame and the side column by pressing the other side column to the one side column. It is.

  The one side column has a protruding portion, and the protruding portion is composed of a plate-like portion and an enlarged portion formed at the tip of the upper portion of the plate, and the other side column has the enlarged portion movable. It is good also as a structure which has space and the opening of the said space which the said plate-shaped part can approach, and the said two ladder bodies couple | bond together so that expansion and contraction is possible because the said projection part slides in the said opening. Or it can be set as the structure by which the said footboard is rotatably attached to the side pillar of both sides.

  Another telescopic ladder according to the present invention includes two ladder bodies each provided with a plurality of step plates between oppositely arranged side columns so that the side columns overlap with each other in a part of the length direction. A telescopic ladder that overlaps and stretches in the direction and connects the two stacked side pillars with a connector when the two stacked ladder bodies reach a predetermined length, and the one side pillar projects The projection is formed of a plate-like portion and an enlarged portion formed at the tip of the upper portion of the plate, and the other side column is a space in which the enlarged portion is movable, and the plate-like portion. The two ladder bodies are connected to each other so that they can be extended and contracted by sliding the projections in the openings.

  According to the present invention, when the side pillars of the upper and lower ladder bodies are overlapped and expanded and contracted, the side pillars are slid so that the length of the ladder is a desired length. The upper and lower side pillars can be temporarily fixed by inserting the member, and then the upper and lower ladder bodies can be connected easily and securely by locking the locking portion to the locked portion. An excellent effect can be achieved.

  If the locking part is composed of a rod-shaped body that can freely advance and retreat in the hole as the locked part, and the rod-shaped body can be locked by rotating it to 1/4 to 3/4 rotation left and right, it can be connected with one touch. There is an effect that can be.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1A and 1B are views of a telescopic ladder according to the present invention, where FIG. 1A is a front view and FIG. 1B is a side view. The telescopic ladder 100 of the present invention is composed of two upper and lower ladder bodies 110 and 120. The two ladder bodies have substantially the same configuration, and a plurality of step plates 113 or 123 are rotatably provided between the left and right side columns 111 and 112 or the side columns 121 and 122. Since the footboards 113 and 123 are freely rotatable, the telescopic ladder 100 of the present invention can be folded and folded. In addition, since the footboards 113 and 123 can be rotated, a brace 116 for preventing a fall is provided, which will be described later. The two ladder bodies 110 and 120 have the connection tool 130 in the middle, and when the length of the telescopic ladder 100 is changed to a desired length, the length can be maintained.

  2A and 2B are views showing a state in which the telescopic ladder of FIG. 1 is folded, in which FIG. 2A is a front view and FIG. 2B is a side view. 3 is an enlarged cross-sectional view taken along the line AA in FIG. 1. FIG. 4A is a cross-sectional view of the side column 112 of the upper ladder body, and FIG. 3B is a view of the side column 122 of the lower ladder body. FIG.

  The side pillar 112 has a C-shaped main body 112a and a protrusion 112b formed on one side of the main body 112a. The projecting portion 112b includes a plate-like portion 112c and an enlarged portion 112d. Further, the main body 112a is provided with two ribs 112f in a direction orthogonal to the protrusion 112b. Between these two ribs 112f, the footboard 113 is fixed rotatably.

  The other side column 122 has the same structure as the side column 112. That is, it has a C-shaped main body 122a and a protrusion 122b formed on the main body 122a, and the protrusion 122b includes a plate-shaped portion 122c and an enlarged portion 122d. A space 122e is provided inside the main body 122a, and an opening 122e 'is provided in the space 122e. Further, the main body 122a is provided with two ribs 122f in a direction orthogonal to the protrusion 122b. Between these two ribs 122f, a tread plate 123 is rotatably fixed. The side pillars 111 and 121 have the same structure. Such a side pillar can be manufactured by extrusion molding of aluminum or plastic molding.

  The main body 112a is C-shaped and has a space 112e inside. The width d of the C-shaped opening 112e 'serving as the entrance to the space 112e is larger than the thickness t of the plate-like portion 112c and smaller than the diameter D of the enlarged portion 112d. Therefore, as shown in FIG. 3, when the enlarged portion 122 d of the side column 122 enters the space 112 e of the side column 112, the enlarged portion 122 d comes out even if the side column 122 tries to move away from the side column 112. I can't leave because I don't. The other side pillars 111 and 121 have the same shape and are also not separated. Therefore, the telescopic ladder of the present invention can simplify the structure of the connection tool.

  The connection tool 130 has a U-shaped frame 131. The frame 131 is fixed to one side column 122 with a bolt 132. The other side of the frame 131 faces the other side column 112 in two directions, and a hollow cylindrical case 133 is fixed to the larger side facing the two side columns 112 and 122 simultaneously. A rod-like body 134 as a locking portion is rotatably supported therein. The rod-shaped body 134 enters the hole 112g as a locked portion drilled in the plate-like portion 112c of the side column 112, thereby connecting and fixing the two side columns 112 and 122.

  The rod-shaped body 134 in the case 133 is integrally provided with a large-diameter portion 135, and a spiral groove 135 a is formed in the large-diameter portion 135, and a convex portion 133 a provided on the inner wall of the case 133 is formed. It fits in this spiral groove 135a. The base end side of the rod-shaped body 134 is bent by approximately 90 ° to form a handle 134a. The pitch of the spiral groove 135a is large, and when the handle 134a is grasped and the rod-shaped body 134 is rotated from 1/4 rotation to 3/4 rotation, the tip of the rod-shaped body 134 passes through the hole 112g from the state of protruding from the hole 112g. You can go back and forth. It is desirable to increase or decrease the pitch of the spiral grooves 135a so that the necessary distance can be advanced and retracted by 1/4 rotation. Further, in the embodiment of the present invention, when the handle 134a comes downward, the rod-like body 134 penetrates the hole 112g. That is, when the center of gravity of the rod-shaped body 134 is in the lowest state, the rod-shaped body 134 as the locking portion is fitted into the hole 112g as the locked portion, and the connection length of the upper and lower side columns 112 and 122 is fixed. Therefore, the fixed state can be stabilized.

  FIG. 5 is a cross-sectional view of the wedge member 136. The wedge member 136 is inserted between the frame body 131 and the side column 122. The wedge member 136 is provided with an operation portion 137, and the operation portion 137 passes through a long hole 131 a formed in the frame body 131 and protrudes outside the frame body 131. At the same time, the wedge member 136 is prevented from being detached from the frame 131 because the operation portion 137 is in the long hole 131a.

  The connection tool 130 having the above configuration is also provided on the upper and lower side pillars 111 and 121 on the left side of FIG. However, depending on the size of the ladder, the size of the connection tool, etc., there may be a case where the rod-like body 134 as the locking part, the hole 112g as the locked part, the wedge member 136, etc. can be omitted in one connection tool. .

  Next, how to assemble the telescopic ladder 100 from the folded state shown in FIG. 2 to the use state shown in FIG. 1 will be described.

  From the folded state shown in FIG. 2, the pair of the right side columns 111 and 121 and the left side columns 121 and 122 are separately grasped and opened to the left and right. Next, it is confirmed that the rod-shaped body 134 of the connection tool 130 has come out of the hole 112g or the like, and the upper ladder body 110 is pulled upward. When the telescopic ladder 100 approaches the desired length, the height of the upper ladder body 110 is adjusted so that the rod-shaped body 134 and any hole 112g overlap. When the rod-shaped body 134 and the hole 112g overlap, the operating member 137 pushes down the wedge member 136. Then, the side pillar 112 is pressed against the side pillar 122 and temporarily fixed. That is, the side pillars 112 and 122 do not shift with a small force. When this state is reached, the handle 134a is grasped and rotated by ¼ to ¾ rotation, and the rod-like body 134 as the locking portion is put into the hole 112g as the locked portion. The assembly of the telescopic ladder 100 is completed by performing the same thing for the connection tools 130 on both the left and right sides. When the rod-shaped body 134 as the locking portion enters the hole 112g as the locked portion, the wedge member 136 presses the side pillars 112 and 122 together, so that the connecting portion of the upper and lower ladder bodies 110 and 120 is connected. Connections can be made without rattling.

  FIG. 6 shows another configuration example in which the rod-shaped body 134 is advanced and retracted. In this example, the spiral surface 235a is formed without providing the spiral groove in the large diameter portion 235. And the convex part 133a formed in the inner surface of the case 133 is made to contact | abut this spiral surface 235a, and the convex part 133a is made to press-contact with the spiral surface 235a with the elastic body 235b.

  By the way, the telescopic ladder 100 of the present invention has a configuration in which both ends of the tread plates 113 and 123 are rotatable. For this reason, the bracing 116 and the like are provided as described with reference to FIG. 1. Next, the fall prevention structure will be described.

  FIG. 7 is a view of the stopper 117 and the bracing 116 constituting the fall prevention structure. When the telescopic ladder 100 shown in FIG. 2 is in the folded state, the footboard 113 is in a substantially vertical state as shown by the phantom line in FIG. 7, and when the telescopic ladder 100 is opened, the footboard 113 is Rotate in the direction. When the tread plate 113 is rotated to a position orthogonal to the side column 112, the tread plate 113 abuts against the stopper 117 provided on the side column 112 and cannot be further rotated. The stopper 117 prevents the telescopic ladder 100 from falling to the left in FIG.

  The bracing 116 has one end 116a that is pivotably locked to the side column 111 and the other end 116b that is pivotably locked to the tread plate 113, and one of 116a and 116b is detachable. When folding as shown in FIG. 2, one of the braces 116 is removed from the tread board 113 or the side pillar 111, and both ends are locked as shown in FIG. 7 when in use. By using this bracing 116, the telescopic ladder 100 is prevented from falling in the right direction. Therefore, by providing the stopper 117 and the bracing 116, the telescopic ladder 100 can be used without falling down in either the left or right direction.

  As another method of the fall prevention structure, the bracing 116 may be provided also on the tread board 113 and the side pillar 112.

It is a figure of the telescopic ladder of this invention, (a) is a front view, (b) is a side view. It is a figure which shows the state which folded the telescopic ladder of FIG. 1, (a) is a front view, (b) is a side view. It is the expanded sectional view cut | disconnected by the AA line of FIG. (A) is sectional drawing of the side column of an upper ladder body, (b) is sectional drawing of the side column of a lower ladder body. It is sectional drawing of a wedge member. It is another structural example which advances and retracts a rod-shaped body. It is a figure of a stopper and a bracing which constitute a fall prevention structure.

Explanation of symbols

100 Extendable ladder 110 Ladder body 120 Ladder bodies 111, 112, 121, 122 Side pillars 112a, 122a Main body portions 112b, 122b Projection portions 112c, 122c Plate-like portions 112d, 122d Enlarged portions 112e, 122e Spaces 112e ', 122e' Openings 112f, 122f rib 112g hole 113, 123 tread plate 116 bracing 117 stopper 130 connector 131 frame 131a long hole 132 bolt 133 case 133a convex part 134 rod-like body 134a handle 135, 235 large diameter part 135a spiral groove 136 wedge member 137 operation Part 235b elastic body 235a spiral surface

Claims (8)

  Two ladders provided with a plurality of step plates between opposed side columns are overlapped and slidable in the length direction so that the side columns overlap at least partly in the length direction. A connecting tool for fixing two overlapping side pillars when the two ladder bodies have a predetermined length by moving, wherein the connecting tool is one of the two stacked side pillars. A frame that has a portion that is fixed to the other side column and that faces the other side column, a locking portion that can be locked / released to a locked portion formed on the other side column, and the other side column, A wedge member that is slidably fitted between the frame body, and the frame member and the side column are temporarily mounted by sliding the wedge member and pressing the other side column against the one side column. A connection tool comprising an operation portion for stopping.   The locking part is made of a rod-like body that can freely advance and retract in a hole as a locked part, and a spiral groove is provided in one of the locking part and the frame, and a convex part that enters the spiral groove is provided in the other. A handle for rotating the rod-shaped body around its central axis is provided, and the rod-shaped body is moved back and forth by 1/4 to 3/4 rotation left and right by the handle, so that the rod-shaped body advances and retreats, and the locking portion and the covered portion are covered. The connection tool according to claim 1, wherein locking / releasing with the locking portion is possible.   The locking part is made of a rod-shaped body that can freely advance and retract in a hole as a locked part, and a spiral surface is provided on one of the locking part and the frame, and a convex part that can contact the spiral surface is provided on the other side. , Provided with an elastic body that presses the convex portion against the spiral surface, and provided with a handle for rotating the rod-shaped body around its central axis, and the rod-shaped body is rotated 1/4 to 3/4 turn left and right by the handle. The connecting tool according to claim 1, wherein the rod-shaped body advances and retreats to enable locking and release of the locking portion and the locked portion.   4. A long hole is formed in the frame body, and the operation portion of the wedge member passes through the long hole, and the operation portion protrudes outside the frame body. The connector as described in.   Two ladder bodies provided with a plurality of treads between opposing side pillars were overlapped and overlapped in such a manner that the side pillars overlapped with each other in a part in the length direction, and extendable in the length direction. An extendable ladder for connecting two overlapping side pillars with connecting tools when the two ladder bodies reach a predetermined length, wherein the connecting tool is attached to one of the two stacked side pillars. A frame that is fixed and surrounds the other side column in at least two directions, a locked portion that is formed on the other side column, and a lock provided on the frame that can be locked and released. A locking member, a wedge member slidably provided between the other side column and the frame, and sliding the wedge member to press the other side column against the one side column The telescopic ladder characterized by having the operation part which temporarily fixes the said frame and a side pillar by this.   The one side column has a protruding portion, and the protruding portion is composed of a plate-like portion and an enlarged portion formed at the tip of the upper portion of the plate, and the other side column has the enlarged portion movable. It has a space and an opening of the space into which the plate-like portion can enter, and the two ladder bodies are connected to be extendable and contractable by sliding the projection in the opening. Item 6. The telescopic ladder according to Item 5.   The telescopic ladder according to claim 5 or 6, wherein the step board is rotatably attached to side columns on both sides.   Two ladder bodies provided with a plurality of treads between opposing side pillars were overlapped and overlapped in such a manner that the side pillars overlapped with each other in a part in the length direction, and extendable in the length direction. An extendable ladder for connecting two overlapping side pillars with connecting tools when two ladder bodies have a predetermined length, wherein the one side pillar has a protrusion, and the protrusion is a plate. The other side column has a space in which the enlarged portion can move and an opening in the space into which the plate-like portion can enter. Then, the projecting portion slides in the opening, so that the two ladder bodies are connected so as to be extendable and contractible.

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