Elevator pit ladder device

Abstract

To provide a pit ladder device that can be easily used without affecting the height of the cage floor or the weight of the cage. [Solution] The elevator pit ladder device 2 includes an extendable ladder 20 that is folded and stored in the elevator pit surface 1a when not in use and extended vertically when in use; a pair of mounting arms 21 provided at the lower end of the car floor 3 and extending from the lower end toward the pit surface 1a; a pair of engaging parts 22 provided on the pit surface 1a side of the mounting arms 21; a fixing part 201 provided on one side of the ladder 20 and rotatably fixing one side of the ladder 20 to the pit surface 1a; and a pair of engaged parts provided on the other side of the ladder 20 and capable of engaging with the engaging parts 22.

Description

Technical Field

[0001] This invention relates to a pit ladder device for an elevator used when an operator enters and exits a pit from a landing.

Background Art

[0002] In a conventional pit ladder device, since the ladder is guided by a ladder guide rail, the ladder is prevented from swinging with the lower part of the car as a fulcrum. Thereby, an operator can easily use the ladder device. (See, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since a space for arranging the ladder guide rail and the rail driving device on the car floor is required, there is a problem that the height of the car floor and the weight of the car increase.

[0005] This invention has been made to solve the above problems, and its object is to provide a pit ladder device that does not require a ladder guide rail and a rail driving device and can be easily used without affecting the height of the car floor and the weight of the car.

Means for Solving the Problems

[0006] The elevator pit ladder device of this invention is characterized by comprising: an extendable ladder that is folded and stored on the elevator pit surface when not in use and extended vertically for use when in use; a pair of mounting arms provided at the lower end of the car floor and extending from the lower end toward the pit surface; a pair of engaging parts provided on the pit surface side of each mounting arm; a fixing part provided on one side of the ladder that rotatably fixes the other side of the ladder toward the pit surface; and a pair of engaged parts provided on the other side of the ladder that can engage with the engaging parts. [Effects of the Invention]

[0007] This invention realizes a pit ladder device that does not require ladder guide rails or rail drive devices, and can be easily used without affecting the height of the elevator car floor or the weight of the elevator car. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the elevator pit ladder device (overall) in use according to Embodiment 1 of this invention. [Figure 2] This is a perspective view showing the elevator pit ladder device (overall) in use, as seen from below, according to Embodiment 1 of this invention (Figure 1). [Figure 3] This is a perspective view showing the elevator pit ladder device (overall) in its retracted state according to Embodiment 1 of this invention. [Figure 4] This is a side view showing the main part of the elevator pit ladder device shown in Figure 1 according to Embodiment 1 of this invention. [Figure 5] This is a side view showing the main part of the elevator pit ladder device shown in Figure 3 according to Embodiment 1 of this invention. [Figure 6] This is a side view showing the preparation (c) for engagement of an elevator pit ladder device before use according to Embodiment 1 of the present invention. [Figure 7] This is an enlarged view (side view) showing the preparation (a) for engagement of the elevator pit ladder device before use according to Embodiment 1 of the present invention. [Figure 8]This is an enlarged view (side view) showing the preparation (b) for engagement of the elevator pit ladder device before use according to Embodiment 1 of the present invention. [Figure 9] This is an enlarged view (side view) showing the engagement preparation (c) of the elevator pit ladder device in Figure 6 according to Embodiment 1 of this invention before use. [Figure 10] This is a side view showing (a) the preparation for storage of an elevator pit ladder device after use, according to Embodiment 1 of the present invention. [Figure 11] This is a side view showing (b) the preparation for storage of the elevator pit ladder device after use according to Embodiment 1 of the present invention.

[0009] Embodiment 1. Figures 1 to 11 illustrate a pit ladder device according to Embodiment 1 of the present invention. Figure 1 is a perspective view showing the device in use, Figure 2 is a perspective view showing Figure 1 viewed from below, Figure 3 is a perspective view showing the device in storage, and Figure 4 is a side view of Figure 1. Figure 5 is a side view of Figure 3. Figure 6 is a side view showing the engagement preparation (c) before use. Figure 7 is an enlarged view showing the engagement preparation (a) before use. Figure 8 is an enlarged view showing the engagement preparation (b) before use. Figure 9 is an enlarged view showing the engagement preparation (c) before use in Figure 6. Figure 10 is a side view showing the storage preparation (a) after use, and Figure 11 is a side view showing the storage preparation (b) after use.

[0010] In Figures 1 to 5, a pit ladder device 2 is provided within the elevator shaft 1. The pit ladder device 2 includes an extendable ladder 20 that is folded and stored on the pit surface 1a when not in use and extended vertically when in use, a mounting arm 21, an engaging part 22, and a engaged part 23.

[0011] The mounting arms 21 are fixed in pairs to the lower part of the car floor 3, separated from each other. Each mounting arm 21 has an arm portion 21a whose longitudinal direction extends vertically from the lower part of the car floor 3 toward the pit surface 1a, and an engaging portion 22 provided at the end of the arm portion 21a on the pit surface 1a side, which can engage with the engaged portion 23 when it comes into contact with it. The mounting arms 21 move with the movement of the car floor 3.

[0012] Further, the mounting arm 21 is fixed at its upper part to the lower end of the car floor 3 and also fixed to the side surface of an apron 4 provided on the car floor 3. The mounting arm 21 is fixed to both the lower end of the car floor 3 and the side surface of the apron 4 on the car floor 3 side, and is also used as a reinforcing member of the apron 4.

[0013] The length of the arm portion 21a is formed to be equal to or shorter than the vertical length of the apron 4.

[0014] The ladder 20 is formed to be foldable at an intermediate portion 200 in the longitudinal direction, and has a fixing portion 201 rotatably fixed to the pit surface 1a at one end and an engaged portion 23 engageable with an engaging portion 22 at the other end.

[0015] The engaging portion 22 has its longitudinal direction arranged horizontally, with a hook portion 22a on one side and a rotating portion 22b on the other side that can rotate the engaging portion 22 when the hook portion 22a abuts on the engaged portion 23 from above and can maintain the horizontal direction of the engaging portion 22 when a load acts on the hook portion 22a.

[0016] The engaged portion 23 is provided at the end of the ladder 20 on the side where it is stretched, and is provided on both sides in the width direction. The engaged portion 23 has an arm portion 23a extending outward along the width direction of the ladder 20.

[0017] Next, in FIGS. 6 to 9, the operation of the first embodiment configured as described above will be described. First, for using the pit ladder device 2, the operation of stretching the ladder 20 in the folded state on the pit surface 1a in the vertical direction will be described.

[0018] First, the operator stops the car floor 3 at the lowest landing 5. Next, the operator switches the elevator operation mode from the normal mode to the maintenance mode. Next, the operator further moves the car floor 3 downward from the lowest floor. The operator operates the elevator to lower the car floor 3 from the pit surface 1a until the hook portion 22a of the engaging portion 22 abuts against the arm portion 23a of the engaged portion 23.

[0019] After the hook portion 22a abuts against the upper part of the arm portion 23a, the operator further lowers the car floor 3 to dispose the hook portion 22a below the arm portion 23a.

[0020] Next, when the operator raises the car floor 3 and the hook portion 22a abuts against the lower part of the arm portion 23a, the hook portion 22a and the arm portion 23a are engaged. In this state, when the operator raises the car floor 3, since the engaging portion 22 maintains a horizontal state, the engaged portion 23 rises in a state of being engaged with the engaging portion 22.

[0021] The ladder 20 is stretched in the vertical direction by being pulled up by the engaging portion 22 via the engaged portion 23. Since the fixing portion 201 of the ladder 20 is fixed to the pit surface 1a, when the operator raises the car floor 3 to a predetermined position, the ladder 20 is in a state of being completely stretched in the vertical direction. When the ladder 20 is in a state of being completely stretched in the vertical direction, the operator stops the upward movement of the car floor 3.

[0022] At this time, a tension in the direction in which the engaged portion 23 is pulled upward as the car floor 3 rises acts on the ladder 20. The car floor 3 is stopped at a predetermined position so that this tension acts on the ladder 20.

[0023] Also, when the operator uses the ladder 20, the car floor 3 is raised to a predetermined position so that a tension necessary to stabilize the ladder 20 in the vertical direction and prevent it from loosening or shifting horizontally acts on the ladder 20.

[0024] In normal operation when the ladder 20 is not in use, the elevator car floor 3 does not move below the lowest floor, so the engaging portion 22 and the engaged portion 23 do not come into contact.

[0025] Next, Figures 10 and 11 will describe the operation of folding and storing the ladder 20, which is extended vertically, against the pit surface 1a. To release the tension acting on the ladder 20, the cage floor 3 is lowered slightly from its predetermined position. The worker detaches the hook portion 22a from the arm portion 23a, releasing the engagement between the hook portion 22a and the arm portion 23a.

[0026] The worker holds the rope 202 attached to the engaged portion 23 of the disengaged ladder 20 and gradually lowers the ladder 20 toward the pit surface 1a. When the middle portion 200 of the ladder 20 contacts the pit surface 1a, the ladder 20 folds into the pit surface 1a, and storage is complete. Once the storage of the ladder 20 is complete, the rope 202 is lowered toward the pit surface 1a.

[0027] As described above, according to Embodiment 1, a pit ladder device 2 can be realized that does not require a ladder guide rail and rail drive device, and can be easily used without affecting the height of the elevator car floor or the weight of the car, by providing a retractable ladder 20 that is folded and stored in the pit surface 1a of the elevator when not in use and extended vertically when in use, a pair of mounting arms 21 provided at the lower end of the car floor 3 and extending from the lower end toward the pit surface 1a, a pair of engaging parts 22 provided on the pit surface 1a side of the mounting arms 21, a fixing part 201 provided on one side of the ladder 20 that rotatably fixes one side of the ladder 20 to the pit surface 1a, and a pair of engaged parts 23 provided on the other side of the ladder 20 that can engage with the engaging parts 22.

[0028] Furthermore, when the ladder 20 is folded against the pit surface 1a, the elevator car floor 3 is moved below the lowest floor, causing the engaging portion 22 to come into contact with the engaged portion 23. As a result of the engagement between the engaging portion 22 and the engaged portion 23, the elevator car floor 3 does not move below the lowest floor when the ladder 20 is not in use, allowing the ladder 20 to be stably stored on the pit surface 1a.

[0029] Furthermore, when the ladder 20 is used, the tension acting on the ladder 20 as the cage floor 3 rises pulls it upward, so that when a worker uses the ladder 20, it can be used stably and easily without the ladder 20 becoming loose in the vertical direction or shifting laterally.

[0030] Furthermore, since the mounting arm 21 is fixed to the apron 4 of the cage floor 3, it can also be used as a reinforcing member of the apron 4, thereby reducing the cost of the pit ladder device 2.

[0031] Although the mounting arm 21 is fixed to the apron 4 of the cage floor 3, it is not necessary for it to be fixed to the apron 4. It goes without saying that the mounting arm 21 will have the same function and effect even if it is fixed only to the cage floor 3. [Explanation of Symbols]

[0032] 1 Hoistway, 1a Pit surface, 2 Pit ladder device, 20 Ladder, 21 Mounting arm, 22 Engaging part, 23 Engaged part, 3 Cage floor, 4 Apron, 5 Landing [Industrial applicability]

[0033] This invention relates to an elevator pit ladder device used when workers enter and exit the pit from the landing.

Claims

1. An extendable ladder that folds up and stores away from the elevator pit when not in use, and extends vertically when needed. A pair of mounting arms provided at the lower end of the cage floor and extending from the lower end toward the pit surface, and a pair of engaging portions provided on the pit surface side of each mounting arm, An elevator pit ladder device characterized by comprising: a fixing part provided on one side of the ladder for rotatably fixing the other side of the ladder to the pit surface; and a pair of engaged parts provided on the other side of the ladder that can engage with the engaging part.

2. The elevator pit ladder device according to claim 1, characterized in that the ladder is folded into the pit surface, the elevator car floor is moved below the lowest floor, and the engaging portion is brought into contact with the engaged portion, thereby engaging the engaging portion and the engaged portion.

3. The elevator pit ladder device according to claim 1, characterized in that when the ladder is used, a tension acts on the ladder that pulls it upward as the elevator car floor rises.

4. The elevator pit ladder device according to claim 1, characterized in that the mounting arm is fixed to the apron of the elevator car floor.

Images