Step-climbing machine with safety device for going up and down stairs

Abstract

The application discloses a stair climbing machine upper and lower floor safety device, which comprises a unit safety mechanism, the unit safety mechanism comprises a ladder side abutting mechanism, a horizontal plane abutting mechanism, an upper floor stroke switch, a lower floor stroke switch and a support, the upper floor stroke switch and the lower floor stroke switch are both installed on the support, the ladder side abutting mechanism and the horizontal plane abutting mechanism are both swingably installed on the support, the ladder side abutting mechanism can swing to trigger the upper floor stroke switch, and the horizontal plane abutting mechanism can trigger the lower floor stroke switch. The application can be used for the stair climbing machine, the ladder side abutting mechanism can abut against the side of the ladder to be climbed to trigger the upper floor stroke switch, and the horizontal plane abutting mechanism can be suspended to trigger the lower floor stroke switch. Therefore, the application can timely trigger the work of the stair climbing machine when needed, and ensures the work reliability of the stair climbing machine.

Description

Technical Field

[0001] This invention relates to the field of mechanical design, and in particular to a safety device for a stepping ladder machine for going up and down stairs. Background Technology

[0002] Staircases are often installed between floors, and people often need to use them to move heavy objects up and down stairs. In the past, moving heavy objects up and down stairs relied on manual labor, which was inefficient and costly. To solve these problems, stepper ladder machines are now widely used to move heavy objects up and down stairs. Stepper ladder machines, also known as step stair climbers, can carry heavy objects step by step between stairs.

[0003] Ideally, a stepper ladder should only need to perform a climbing motion to move between steps. However, in actual staircases, many stair steps are quite wide. Due to the size limitations of the stepper ladder, it often needs to make some lateral movement after each climbing motion. If the stepper ladder performs the climbing motion incorrectly, it may cause it to tip over. How to enable the stepper ladder to perform the climbing motion in a timely manner has become an urgent problem that people hope to solve when designing stepper ladders. Summary of the Invention

[0004] The purpose of this invention is to provide a safety device for a step ladder machine that can solve one or more of the above-mentioned problems.

[0005] According to one aspect of the present invention, a safety device for going up and down stairs of a stepping ladder machine is provided, comprising a unit safety mechanism. The unit safety mechanism includes a step side abutment mechanism, a horizontal surface abutment mechanism, an up-stairs limit switch, a down-stairs limit switch, and a bracket. The up-stairs limit switch and the down-stairs limit switch are both mounted on the bracket. The step side abutment mechanism and the horizontal surface abutment mechanism are both swayably mounted on the bracket. The step side abutment mechanism can sway to trigger the up-stairs limit switch, and the horizontal surface abutment mechanism can trigger the down-stairs limit switch.

[0006] The beneficial effects of this invention are as follows: This invention can be used on stepper ladder machines. The triggering of the upstairs limit switch and the downstairs limit switch can correspondingly enable the stepper ladder machine to perform step-climbing and step-descending actions. When the ladder machine is moving on a horizontal surface, neither the upstairs nor the downstairs limit switch will be triggered. However, during step-climbing, the step side abutment mechanism can abut against the side of the step to be climbed, thereby triggering the upstairs limit switch. During step-descending, the horizontal abutment mechanism will be suspended, thereby triggering the downstairs limit switch. Thus, this invention can trigger the operation of the stepper ladder machine in a timely manner when needed, ensuring the reliability of the stepper ladder machine's operation.

[0007] In some embodiments, the stepped side abutment mechanism includes an abutment block, a spring, a connecting block, and a first contact block. The connecting block is hinged to a bracket, the abutment block is connected to the connecting block, one end of the spring is connected to the bracket, and the other end is connected to the abutment block. The first contact block is fixedly connected to the connecting block. The spring mechanism facilitates the reset of the abutment block when no force is applied.

[0008] In some embodiments, the first contact block is provided with a first triggering part and a first avoidance part, and the connecting block can swing so that the first triggering part triggers the upstairs travel switch.

[0009] In some embodiments, the horizontal surface contact mechanism includes a roller, a roller frame, and a second contact block. The roller frame is hinged to a bracket, the roller is rotatably mounted on the roller frame, and the second contact block is fixedly connected to the roller frame. The roller arrangement helps to prevent excessive friction caused by an excessively large contact area with the horizontal surface when the horizontal surface contact mechanism contacts the horizontal surface, thus preventing the invention from moving effectively.

[0010] In some embodiments, the second contact block is provided with a second triggering part and a second avoidance part, and the roller frame can swing so that the second triggering part triggers the downstairs limit switch.

[0011] In some embodiments, the unit safety mechanism includes a main wheel rotatably mounted on a bracket. The main wheel facilitates the movement of the invention.

[0012] In some embodiments, the present invention further includes a connecting frame, and there are multiple unit safety mechanisms, with the supports of adjacent unit safety mechanisms connected to each other via the connecting frame. The arrangement of multiple unit safety mechanisms ensures that even if the limit switch of one unit safety mechanism is accidentally triggered, the stepper stair climber connected to the present invention will not perform the stair climbing action, further improving its operational safety.

[0013] In some embodiments, the connecting frame includes a first connecting arm, a second connecting arm, and a connecting rod, one end of which is connected to the first connecting arm and the other end of which is connected to the second connecting arm.

[0014] In some embodiments, the unit safety mechanism further includes a cover plate mounted on a bracket and covering the upstairs limit switch and the downstairs limit switch. The cover plate effectively conceals and protects the upstairs limit switch and the downstairs limit switch. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a safety device for going up and down stairs in a step ladder machine according to one embodiment of the present invention.

[0016] Figure 2This is a schematic diagram of the unit safety mechanism of the step ladder machine's up-and-down safety device according to one embodiment of the present invention, without a cover plate.

[0017] Figure 3 This is a side view of the structural schematic diagram of the unit safety mechanism of the step ladder machine's up-and-down safety device according to an embodiment of the present invention, without a cover plate.

[0018] In the diagram: 1. Unit safety mechanism, 11. Step side abutment mechanism, 12. Horizontal plane abutment mechanism, 13. Upward limit switch, 14. Downward limit switch, 15. Bracket, 16. Main wheel, 17. Connecting frame, 18. Cover plate, 111. Abutment block, 112. Connecting block, 113. First contact block, 1131. First trigger part, 1132. First clearance part, 121. Roller, 122. Roller frame, 123. Second contact block, 1231. Second trigger part, 1232. Second clearance part, 171. First connecting arm, 172. Second connecting arm, 173. Connecting rod. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a safety device for a stepping ladder machine for going up and down stairs, comprising a unit safety mechanism 1, which includes a step side abutment mechanism 11, a horizontal surface abutment mechanism 12, an upstairs limit switch 13, a downstairs limit switch 14, and a bracket 15.

[0021] Both the upstairs limit switch 13 and the downstairs limit switch 14 are fixedly mounted on the bracket 15 with bolts.

[0022] The step side abutment mechanism 11 includes an abutment block 111, a spring (not shown in the figure), a connecting block 112, and a first contact block 113. The connecting block 112 is hinged to the bracket 15 by a pin, so that the connecting block 112 can swing on the bracket 15 to a certain extent. The abutment block 111 and the connecting block 112 are fixedly connected by screws. One end of the spring is fixedly connected to the bracket 15, and the other end of the spring is fixedly connected to the abutment block 111. The first contact block 113 is fixedly connected to the connecting block 112 by welding.

[0023] The first contact block 113 is provided with a first trigger part 1131 and a first clearance part 1132. The first contact block 113 is located near the upstairs limit switch 13. Under normal conditions, due to the elastic force of the spring, the contact block 111 tilts outward, so the first clearance part 1132 is closer to the upstairs limit switch 13, and the first trigger part 1131 does not contact the upstairs limit switch 13. However, when the contact block 111 comes into contact with the outside, the spring can be compressed, and the connecting block 112 connected to the contact block 111 can swing so that the first trigger part 1131 can contact the upstairs limit switch 13 and trigger the upstairs limit switch 13.

[0024] The horizontal contact mechanism 12 includes a roller 121, a roller frame 122, and a second contact block 123. The roller frame 122 is hinged to the bracket 15 by a pin, so the roller frame 122 can swing on the bracket 15 to a certain extent. The roller 121 is rotatably mounted on the roller frame 122 by a shaft, and the second contact block 123 is fixedly connected to the roller frame 122 by welding.

[0025] The second contact block 123 is provided with a second trigger part 1231 and a second avoidance part 1232. When the present invention is on a horizontal surface, the roller 121 can abut against the horizontal surface, thereby maintaining the current position of the roller frame 122. At this time, the second avoidance part 1232 is closer to the downstairs limit switch 14, and the second trigger part 1231 does not contact the downstairs limit switch 14. When going downstairs, the roller 121 no longer abuts against the horizontal surface. The roller 121 moves down due to gravity, causing the roller frame 122 to swing. The swing of the roller frame 122 can cause the second trigger part 1231 to contact the downstairs limit switch 14 and trigger the downstairs limit switch 14.

[0026] The unit safety mechanism 1 also includes a main wheel 16, which is rotatably mounted on the bracket 15 via a shaft.

[0027] The unit safety mechanism 1 also includes a cover plate 18, which is fixedly mounted on the bracket 15 by bolts, and covers the upstairs limit switch 13 and the downstairs limit switch 14.

[0028] The safety device for going up and down stairs of this step ladder machine also includes a connecting frame 17. There can be multiple unit safety mechanisms 1. In this embodiment, two unit safety mechanisms 1 are preferred.

[0029] The connecting frame 17 includes a first connecting arm 171, a second connecting arm 172, and a connecting rod 173. One end of the connecting rod 173 is fixedly connected to the first connecting arm 171 by welding, and the other end of the connecting rod 173 is fixedly connected to the second connecting arm 172 by welding. Reinforcing blocks are provided at the connection points of the first connecting arm 171 and the connecting rod 173, as well as at the connection points of the second connecting arm 172 and the connecting rod 173.

[0030] The bracket 15 of a unit insurance mechanism 1 is connected to the first connecting arm 171 of the connecting frame 17 by bolts, and the bracket 15 of the unit insurance mechanism 1 adjacent to the unit insurance mechanism 1 is connected to the second connecting arm 172 of the connecting frame 17 by bolts. That is, the brackets 15 of adjacent unit insurance mechanisms 1 are connected through the connecting frame 17.

[0031] In use, the connecting rod 173 can be connected to the stepper ladder machine via bolts, thereby linking the upstairs limit switch 13 of the unit safety mechanism 1 with the stepper ladder machine's step-climbing action, and the downstairs limit switch 14 with the stepper ladder machine's step-falling action. This ensures that the stepper ladder machine will only perform the step-climbing action when all upstairs limit switches 13 are triggered simultaneously, and the stepper ladder machine will only perform the step-falling action when all downstairs limit switches 14 are triggered simultaneously.

[0032] When there is no need to climb stairs, i.e., when all unit safety mechanisms 1 are moving on the horizontal surface, the abutment 111 tilts outward due to the elastic force of the spring. The first clearance part 1132 is closer to the upstairs limit switch 13, and the first trigger part 1131 does not contact the upstairs limit switch 13. At the same time, the roller 121 can abut against the horizontal surface. At this time, the second clearance part 1232 is closer to the downstairs limit switch 14, and the second trigger part 1231 does not contact the downstairs limit switch 14. That is, neither the upstairs limit switch 13 nor the downstairs limit switch 14 is triggered.

[0033] When a step-climbing action is required, the spring can be compressed when the stop block 111 of the unit safety mechanism 1 abuts against the side of the step to be climbed, and the connecting block 112 connected to the stop block 111 can swing so that the first trigger part 1131 can contact the upstairs limit switch 13 and trigger the upstairs limit switch 13, thereby triggering the step-climbing action of the stepper ladder machine.

[0034] When a step-down action is required, when the roller 121 of the unit safety mechanism 1 is above the step plane and above another step, the roller 121 is no longer in contact with the horizontal plane. The roller 121 moves downward due to gravity, causing the roller frame 122 to swing. The swing of the roller frame 122 can cause the second trigger part 1231 to contact the down-step limit switch 14 and trigger the down-step limit switch 14, thereby triggering the step-down action of the step climbing machine.

[0035] Therefore, this invention can trigger the operation of the stepper ladder machine when needed, ensuring the reliability of the stepper ladder machine and effectively avoiding problems such as tipping over due to erroneous operation.

[0036] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A safety device for a stepping ladder machine, characterized in that, The device includes a unit safety mechanism, comprising a step side abutment mechanism, a horizontal surface abutment mechanism, an up-floor limit switch, a down-floor limit switch, and a bracket. Both the up-floor and down-floor limit switches are mounted on the bracket. Both the step side abutment mechanism and the horizontal surface abutment mechanism are oscillatingly mounted on the bracket. The step side abutment mechanism can oscillate to trigger the up-floor limit switch, and the horizontal surface abutment mechanism can trigger the down-floor limit switch. The stepped side abutment mechanism includes an abutment block, a spring, a connecting block, and a first contact block. The connecting block is hinged to the bracket, the abutment block is connected to the connecting block, one end of the spring is connected to the bracket, and the other end is connected to the abutment block. The first contact block is fixedly connected to the connecting block. The horizontal contact mechanism includes a roller, a roller frame, and a second contact block. The roller frame is hinged to a bracket, the roller is rotatably mounted on the roller frame, and the second contact block is fixedly connected to the roller frame.

2. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 1, characterized in that, The first contact block is provided with a first triggering part and a first avoidance part, and the connecting block can swing so that the first triggering part triggers the upstairs limit switch.

3. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 1, characterized in that, The second contact block is provided with a second trigger part and a second avoidance part, and the roller frame can swing so that the second trigger part triggers the downstairs limit switch.

4. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 1, characterized in that, The unit safety mechanism includes a main wheel, which is rotatably mounted on a bracket.

5. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 1, characterized in that, Includes a connecting frame, and there are multiple unit safety mechanisms, with the supports of adjacent unit safety mechanisms connected by the connecting frame.

6. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 5, characterized in that, The connecting frame includes a first connecting arm, a second connecting arm, and a connecting rod. One end of the connecting rod is connected to the first connecting arm, and the other end is connected to the second connecting arm.

7. The safety device for ascending and descending stairs of a stepping ladder machine according to claim 1, characterized in that, The unit safety mechanism includes a cover plate mounted on a bracket and covering the upstairs limit switch and the downstairs limit switch.

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