Rotating handrail safety mechanism

Abstract

To provide a safety mechanism for a rotating handrail, which prevents a patient from getting off a bed by opening the door of the rotating handrail and provides a highly safe protective effect. [Solution] The safety mechanism for a rotating handrail comprises a lattice (16), a door (17), a positioning piece, a rotating shaft base, a positioning hole, an assembly chamber, a handle, a rod (18), a push button, and a tongue. The door is installed on one side of the lattice so as to be rotatable relative to the lattice. The positioning piece is fixed between the lattice and the door and has multiple recesses formed on its periphery, with multiple protrusions separated by each recess and spaced at equal intervals. The rotating shaft base is disposed between the door and the lattice and includes a body that can rotate relative to the positioning piece. The positioning hole is provided inside the body and rotates with the body, corresponding to the recess in the positioning piece. The assembly chamber is provided inside the body and communicates with the positioning hole.

Description

[Technical Field]

[0001] This invention relates to the field of bed protection, and more particularly to a safety mechanism for a revolving handrail, which prevents a patient from getting off the bed by opening the door of the revolving handrail, thereby achieving a high level of safety and protection. [Background technology]

[0002] Conventional medical beds generally have handrails on both sides to prevent patients from falling. Typically, at least one handrail has an access gate that can be pushed open to allow the patient to leave the bed smoothly. When the patient returns to the bed and closes the access gate, the handrail ensures the patient's safety.

[0003] Conventional handrails are equipped with locks and used as a safety mechanism for the access gate to open and close, but by simply observing the medical staff operating it, they learned how to easily open the gate, allowing the patient to push it open and easily get off the bed and leave.

[0004] In view of this problem, for example, Patent Document 1 discloses a handrail structure that uses a safety lock mechanism to attach an active part to the side of a fixed part. This safety lock mechanism includes an outer tube, an inner tube, and a control member. Two L-shaped guide grooves are formed at the top edge of the outer tube wall, and an inverted U-shaped positioning groove is formed in the middle of the tube wall. The inner tube is inserted into the outer tube, and its wall has horizontal grooves and positioning rods. The horizontal grooves face the two guide grooves. The positioning rod protrudes from the inner tube and is inserted into the positioning grooves to move the active part to an open position or a closed position relative to the fixed part. A single interlocking rod is extended below the control member and inserted into the inner tube. A single guide rod protrudes from the interlocking rod. The guide rod is inserted into the horizontal grooves of the inner tube and into one of the two guide grooves to hold the active part in the closed position or the open position.

[0005] However, the activity area, which swings outward by approximately 90 degrees from the closed position to the open position, could not prevent patients from getting out of bed. Generally, patients were able to get out of bed and return to it on their own. Patients with declining cognitive function, especially those with very low cognitive function, may be unable to return to bed on their own after leaving it, even in long-term residential environments, which increases the burden on caregivers, medical staff, and family members to find them.

[0006] In addition, in horizontal tanks where the inner pipe is opened more than 90 degrees, the structural strength of the pipe wall is insufficient. This had the drawback of shortening the service life of the handrails, so improvements were necessary. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Taiwan Utility Model Registration No. M607585 Summary of the Invention [Problem to be solved by the invention]

[0008] The main purpose of this invention is to provide a safety mechanism for a rotating handrail that uses a multi-stage mechanical structure to solve the problem of the active part opening to the maximum extent in the prior art, and is applied to a rotating handrail to control the angle at which the door opens, preventing persons with cognitive impairment from getting out of bed on their own, ensuring the safety of patients and preventing them from going missing. Another object of the present invention is to provide a safety mechanism for a rotating handrail that utilizes an assembly mechanism that combines a push button and a handle, which maintains the structural strength of the basic structure, controls the opening and closing of the rotating handrail, and extends the service life of the rotating handrail, thereby avoiding the reduction in structural strength that occurs in the prior art and adversely affecting service life. [Means for solving the problem]

[0009] In view of this situation, the inventors of the present invention have conducted extensive research and have solved the problems of the prior art, thereby completing the present invention.

[0010] In order to solve the above problems, according to a first aspect of the present invention, there is provided a safety mechanism for a rotating handrail, comprising a lattice (16), a door (17), a positioning piece (31), a rotating shaft base (40), a positioning hole (60), an assembly chamber (50), a handle (34), a rod (80), a push button (70), and a tongue (75), wherein the door (17) is rotatably installed on one side of the lattice (16), and the positioning piece (31) is fixed between the lattice (16) and the door (17), and forms a plurality of recesses (32) on its periphery; The recesses (32) separate a plurality of protrusions (33) at equal intervals, the rotary shaft base (40) is disposed between the door (17) and the lattice (16) and includes a main body (41) that can rotate relative to the positioning piece (31), the positioning hole (60) is provided inside the main body (41) and rotates with the main body (41) and corresponds to the recesses (32) of the positioning piece (31), the assembly chamber (50) is provided inside the main body (41) and communicates with the positioning hole (60), and the handle (34) is The rod (80) is attached to the main body (41) so as to be swingable. The rod (80) is inserted into the positioning hole (60) and has a spring-out function. One end of the rod (80) is connected to the handle (34) and extends from the main body (41), and the other end can be inserted into the recess (32) of the positioning piece (31). When the handle is pulled up, it is released from the recess (32). The push button (70) is installed in the assembly chamber (50) and springs out in a direction different from the direction in which the handle is pulled up. The push button (70) has a tongue (75). The tongue (75) extends outward and is provided so as to straddle the positioning hole (60), the tongue (75) has a locking hole (79) through which the rod (80) is inserted, the handle (34) can be pulled up when the tongue (75) does not interfere with the rod (80), and when the tongue (75) prevents the rod (80) from being inserted into the locking hole (79), the handle (34) is restricted from being pulled up, and the door (17) is prevented from being opened without permission.

[0011] It is preferable that the rod (80) has a head (86) with a larger diameter, the head (86) is freely inserted into the locking hole (79), the tongue (75) does not obstruct the rod (80) and allows the handle (34) to be pulled up, and the tongue (75) obstructs the head (86), and the rod (80) restrains the handle (34) from being pulled up.

[0012] It is preferable that the assembly chamber (50) communicates with the positioning hole (60) via an elongated hole (55) and a vertical hole (56), a separation portion (54) is provided between the elongated hole (55) and the vertical hole (56), the push button (70) includes a hook piece (74) that extends outward from the push button (70) and is hooked onto the separation portion (54) via the vertical hole (56), holding the push button (70) in a pressed state, and the elongated hole (55) guides the tongue piece (75) to insert it deeply into the positioning hole (60), restricting the rod (80) from passing through the lock hole (79).

[0013] It is preferable that the assembly chamber (50) communicates with the positioning hole (60) via an elongated hole (55) and a vertical hole (56), a separation portion (54) is provided between the elongated hole (55) and the vertical hole (56), the push button (70) includes a hook piece (74), the hook piece (74) and the tongue piece (75) are inserted into the push button (70), the hook piece (74) is hooked onto the separation portion (54) via the vertical hole (56), the push button (70) is held in a pressed state, the elongated hole (55) guides the tongue piece (75) and inserts it deeply into the positioning hole (60), and the rod (80) is restricted from passing through the lock hole (79). [Effects of the Invention]

[0014] The rotating handrail safety mechanism of the present invention has the following advantages (1) and (2). (1) To solve the problem of the active part of the conventional technology opening to the maximum, a multi-stage mechanical structure is adopted and applied to a rotating handrail to control the angle at which the door opens, preventing persons with cognitive impairment from getting out of bed on their own, ensuring the safety of patients and preventing them from going missing. (2) In order to prevent the conventional technology from reducing structural strength, which has a negative impact on service life, an assembly mechanism combining a push button and a handle is used, which maintains the structural strength of the basic structure, controls the opening and closing of the rotating handrail, and extends the service life. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an explanatory diagram showing a bed with handrails according to an embodiment of the present invention; FIG. [Figure 2] 1 is an explanatory diagram showing a rotating handrail lattice according to one embodiment of the present invention; FIG. [Figure 3] 1 is a perspective view of a revolving handrail door according to an embodiment of the present invention; FIG. [Figure 4] 1 is an assembled perspective view of a safety mechanism according to an embodiment of the present invention; FIG. [Figure 5] FIG. 2 is an exploded perspective view of a safety mechanism according to an embodiment of the present invention; [Figure 6] FIG. 10 is a perspective view of the functional configuration of the handle according to the embodiment of the present invention from another angle. [Figure 7] FIG. 10 is a perspective view of the functional configuration of the rotary shaft base according to the embodiment of the present invention from another angle; [Figure 8] FIG. 10 is a perspective view of the functional configuration of the rotary shaft base according to the embodiment of the present invention from another angle; [Figure 9] 1 is a cross-sectional view of the safety mechanism of the present invention, showing the locked state of use; FIG. [Figure 10] FIG. 2 is a cross-sectional view of the safety mechanism of the present invention in an unlocked state; [Figure 11] 10 is an assembled cross-sectional view illustrating an adjustment operation performed by a safety mechanism according to an embodiment of the present invention. FIG. [Figure 12]FIG. 2 is an explanatory diagram showing the state in which the rotating handrail according to one embodiment of the present invention is unfolded and the rotating shaft base is removed. [Figure 13] FIG. 10 is a cross-sectional perspective view showing another embodiment of the push button. DETAILED DESCRIPTION OF THE INVENTION

[0016] Referring to FIG. 1, as shown in FIG. 1, a bed 10 with a swivel handrail safety mechanism according to one embodiment of the present invention includes a bed frame 11, a number of legs 12, a fixed handrail 13, two plates 14, and a swivel handrail 15. Each leg 12 is fixed to the bottom of the bed frame 11 and collectively supports the weight of the bed frame 11 (including, for example, a mattress, a patient, and other items). The two plates 14 are fixed to both ends of the bed frame 11 and are used to protect the patient's head and feet. The fixed handrail 13 is detachably attached to one side of the bed frame 11, typically close to a wall (not shown) in the room. The swivel handrail 15 is detachably attached to the other side of the bed frame 11, typically close to a traffic flow (not shown) in the room. If there is traffic flow on both sides of the bed frame 11, the fixed handrail 13 can be removed and replaced with another swivel handrail 15. In brief, two rotating handrails 15 are provided on each side of the bed frame 11.

[0017] The rotating handrail 15 uses a safety mechanism 30 to attach one door 17 to one side of the lattice 16. The safety mechanism 30 prevents the door 17 from opening accidentally, preventing the patient from leaving the bed on their own, providing a safe and protective function. Of course, the safety mechanism 30 may also operate the door 17 to open at a predetermined angle relative to the lattice 16, allowing the patient to easily get off and leave the bed. Two levers 18 extend from the bottom of the lattice 16. The two levers 18 are detachably inserted into the edges of the bed frame 11 and are used to support the door 17 when opening and closing.

[0018] Next, the structure of the rotating handrail 15 will be described in detail to further understand the function of the safety mechanism 30.

[0019] Referring to Figure 2, as shown in Figure 2, three pivot structures are installed on one side of the lattice 16. The three pivot structures are arranged in parallel, with the upper pivot structure 20, the pivot structure 27, and the lower pivot structure 21 arranged in this order from top to bottom. The upper pivot structure 20 is formed by welding one pipe 23 to one support rod 22. The support rod 22 protrudes to the outside from the lattice 16. The pivot structure 27 and the lower pivot structure 21 have the same structure, and the axes of the three pipes 23 are located on one virtual center line (not shown).

[0020] Referring to Figure 3, two shafts are installed on one side of the door 17 and are held coaxially with each other. The two shafts are defined as a long shaft 24 and a short shaft 25. The long shaft 24 is inserted into the tube 23 of the upper pivot structure 20 (see Figure 2) and is evenly inserted through the multiple holes 26. The short shaft 25 is inserted into the tube 23 of the lower pivot structure 21 (see Figure 2).

[0021] Referring to FIG. 4, as shown in FIG. 4, the safety mechanism 30 includes, but is not limited to, a handle 34, a pivot base 40, and a push button 70. The pivot base 40 is disposed in the rotating handrail 15 and serves as the base of the safety mechanism 30. The handle 34 is disposed on the pivot base 40 and operates to open the door 17, allowing the patient to easily get off the bed 10. Alternatively, the patient can return to the bed 10 and operate the handle 34 to close the door 17 (see FIG. 1). The push button 70 is disposed on the pivot base 40 and is movable between an ON position and a BLOCK position. When in the ON position, the handle 34 can be used to open or close the door 17. When in the BLOCK position, the handle 34 cannot be moved, preventing the door 17 from opening and closing, thereby providing safety protection.

[0022] Referring to Figure 5, one fastener 90 is loosened to remove one washer 91, one bushing 92, and one washer 93. The other fastener 47 is loosened to remove the rotary shaft base 40 from the long shaft 24 and one positioning piece 31. The positioning piece 31 is fixed onto the tube 23 of the pivotal mounting structure 27, and has a plurality of recesses 32 and an equal number of protrusions 33 around its periphery. The protrusions 33 are located between two adjacent recesses 32, and the positioning piece 31 resembles a gear.

[0023] By loosening the nut 83 and removing one rod 80, the other washer 82, and one spring 84, the handle 34 can be removed from the rotary shaft base 40. By removing one pin 72, the tongue 75 and elastic member 77 can be removed from the push button 70.

[0024] Referring to FIG. 6, as shown in FIG. 6, the handle 34 extends obliquely from a higher position toward the ring body 35 at a lower position, and an anti-slip pattern is formed on the higher back surface (not shown). A thin neck 36 is erected on the back surface of the ring body 35. A sphere 37 is provided at the end of the thin neck 36. The entrances of the sphere 37 and the oblique hole 38 (see FIG. 9) are located on both sides of the central hole of the ring body 35. The exit of the oblique hole 38 is located on the front surface of the ring body 35 and is surrounded by a reinforcing portion 39. The reinforcing portion 39 protrudes from the intersection of the ring body 35 and the above-mentioned oblique section, thereby enhancing the structural strength of the entire handle 34.

[0025] Referring to FIG. 7, as shown, the rotary shaft base 40 has a main body 41. A base 42 is formed at the bottom end of the main body 41, and an extension 43 is protruded from a portion of the main body 41 adjacent to the base 42. The main body 41 is uniformly inserted into three screw holes 46. The orientation of each screw hole 46 corresponds to the hole 26 of the longitudinal shaft 24, and each screw hole 46 directly reaches one through-hole 45 inside the main body 41. The through-hole 45 extends upward to the top end of the main body 41 and downward to the receiving chamber 44 inside the base 42. The through-hole 45 and one positioning hole 60 inside the main body 41 are formed parallel to each other. A spherical groove 48 is formed in the main body 41 along the radial direction of the through-hole 45. The spherical groove 48 is cut vertically to reach the top end of the main body 41, forming a horizontal groove 49. The width of the horizontal chamber 49 is smaller than the diameter of the spherical chamber 48 .

[0026] 9, the thin neck 36 is inserted into the horizontal groove 49, and the sphere 37 is inserted into the spherical groove 48, supporting the handle 34 and allowing it to swing relative to the main body 41. The ring body 35 covers the upper end of the main body 41, aligning the through hole 45 with the central hole of the ring body 35 and aligning the entrance of the oblique hole 38 with the small-diameter step 61 of the positioning hole 60. The positioning hole 60 further includes one spring groove 62 and one sleeve 87. The diameter of the spring groove 62 is larger than the diameter of the small-diameter step 61, and a shoulder 64 is provided between them. The main body 41 is injection molded to cover the exterior of the sleeve 87, forming a covering portion 63.

[0027] Next, one of the ends of the rod 80 is formed into a male thread step 81, and the spring 84 is inserted through the rod 80. The rod 80 is inserted into the positioning hole 60, extending from the oblique hole 38 and the washer 82, and then the nut 83 is tightened. The other end of the rod 80 is formed into a head 86. The head 86 has a polygonal groove (not shown) and transmits the torque of a tool (e.g., a screwdriver) to the male thread step 81. One end of the spring 84 abuts the shoulder 64, and the other end presses against a protruding edge 85 in the middle of the rod 80. The force of the spring 84 acts on the rod 80, pushing the free end of the head 86 out of the positioning hole 60 and restricting the ring 35 from covering the upper end of the main body 41. The sleeve 87 has greater rigidity than the main body 41, allowing the head 86 to smoothly move in and out of the positioning hole 60.

[0028] The long shaft 24 passes through the central hole of the ring 35 and into the through-hole 45 of the shaft base 40. Three fasteners 47 respectively enter corresponding threaded holes 46 in the shaft base 40 and are tightened onto the long shaft 24, fixing the shaft base 40 to the long shaft 24 and covering the positioning piece 31 with the base 42. The positioning piece 31 is located in the receiving chamber 44, and the positioning hole 60 communicates with one of the recesses 32. The fastener 90 is threaded through the washer 91 and bushing 92 and onto the free end of the long shaft 24, attaching the ring 35 together with the shaft base 40 between the upper pivot structure 20 and the pivot structure 27. At the same time, a washer 93 is fitted onto the outside of the bushing 92 to reduce friction between it and the pipe 23 and reduce noise.

[0029] 8 and 9, the extension portion 43 has a wall 51, which is surrounded by the wall 51 to form an assembly chamber 50 in the extension portion 43, and is used to attach a push button 70. Two slide grooves 52 are symmetrically formed on the inner side of the wall 51. One end of the slide groove 52 is connected to the outlet of the assembly chamber 50, and the other end is connected to one bottom portion 53 of the assembly chamber 50. The bottom portion 53 is connected to the spring recess 62 of the positioning hole 60 via a special-shaped hole. The assembly chamber 50 has one separation portion 54. The separation portion 54 divides the special-shaped hole into one elongated hole 55 and one vertical hole 56. The vertical hole 56 and the spring recess 62 are connected to each other. The separation portion 54 is located at the intersection of the vertical hole 56 and the spring recess 62. The elongated hole 55 intersects the spring recess 62 and extends towards the through hole 45 .

[0030] 5 and 9, as shown in Figures 5 and 9, the tongue 75 has a positioning hole 78 and a locking hole 79. The tongue 75 is inserted into the inner post 76 of the push button 70, with the positioning hole 78 positioned between the two perforations 73 of the push button 70. The pin 72 is inserted through one of the perforations 73 into the overlapping tongue 75 and inner post 76, connecting the tongue 75 to the push button 70 and integrating it into one piece, with the tongue 75 extending from the portion having the locking hole 79. A hook 74 extends outward from the inner post 76, with its hook end facing the locking hole 79 of the tongue 75.

[0031] 13, in another embodiment, the hook piece 74 is formed as an independent member, inserted into the inner post 76, and arranged parallel to the tongue piece 75. The pin 72 is inserted through the overlapping hook piece 74, tongue piece 75, and inner post 76, and is connected to the push button 70 to be integrally formed.

[0032] 9, when the rod 80 is inserted into the locking hole 79, the elastic member 77 is fitted around the inner post 76, one end of which abuts against the bottom 53 of the assembly chamber 50, and the other end of which pushes the push button 70, extending the extension 43. As a result, the tongue 75 comes into contact with the rod 80, preventing the push button 70 from springing outward from the extension 43. When a portion of the head 86 extends from the positioning hole 60 and enters one of the recesses 32, the stopper action of the protrusions 33 on both sides of the head 86 prevents the door 17 from rotating relative to the grille 16, locking the push button 70. At the same time, the tongue 75 displaces along the elongated hole 55 and comes into contact with the rod 80, which has a smaller diameter. The stopper action of the head 86, which has a larger diameter, prevents the handle 34 from being lifted off the rotary shaft base 40.

[0033] The push button 70 has two symmetrical keys 71 protruding outward. The two keys 71 are aligned with corresponding slide grooves 52 in the wall 51 and guide the push button 70 for insertion into the assembly chamber 50. The slide grooves 52 guide the keys 71 for reciprocating movement, restricting the push button 70 to linear displacement and preventing it from rotating relative to the extension 43.

[0034] 10, when the push button 70 is pushed into the assembly chamber 50, the hook piece 74 and the tongue piece 75 are displaced in the same direction. When the hook piece 74 passes the separation portion 54, it enters the spring recess 62 through the vertical hole 56. Due to its own elasticity, the hook end is engaged with the separation portion 54, countering the force of the elastic member 77 and preventing the push button 70 from returning to its original position. As the tongue piece 75 continues to enter the deeper portion of the elongated hole 55, the lock hole 79 is aligned with the head portion 86, and the locked state of the rod 80 can be released. At this time, the push button 70 is in the unlocked state.

[0035] Referring to Figure 11, when the handle 34 is pulled up, the ring body 35 pulls up the rod 80 via the nut 83, and the head 86 is inserted into the lock hole 79, pushing open the hook end and drawing it into the spring recess 62, eliminating the stopper effect on the protrusion 33. At this time, the protrusion 85 engages with the shoulder 64 and presses the spring 84, generating a biasing force that restores the spring 84 due to the stored energy. The hook piece 74 is free to return to the vertical hole 56. However, the elastic member 77 pushes the push button 70 slightly outward, preventing it from returning completely to its original position. Of course, the door 17 is free to swing at a predetermined angle relative to the grille 16.

[0036] Referring to Figure 12, when the handle 34 is released, the spring 84 pushes the tongue 85, moving the rod 80 back to its original position. The head 86 is inserted into the other recess 32, stopping the protrusions 33 on both sides, determining the swingable width of the door 17 and preventing the rotating handrail 15 from continuing to open or close. When the tongue 75 comes into contact with the rod 80, the head 86 stops again, restoring the handle 34 to its unusable state. At the same time, the push button 70 returns to its original position, waiting for the next use.

[0037] If the handle 34 is pulled up for a short time, the handle 34 is released instantly. Normally, the head 86 gets caught in the next recess 32, and the opening angle of the door 17 becomes equal to the included angle between the two recesses 32.

[0038] If the handle 34 is pulled up for a long period of time, the door 17 opens to the maximum angle, making it easier for the patient to get off the bed and leave.

[0039] In particular, the operation direction of the push button 70 is different from the pulling direction of the handle 34, which is clearly different from the operation mode of the prior art. This device utilizes a two-handed interaction mode to help nursing staff or caregivers monitor the patient's health status, prevent people with cognitive impairment from leaving the bed on their own, ensure patient safety, and prevent patients from going missing. Furthermore, the push button 70, combined with the handle 34 and attached to the rotating shaft base, maintains the structural strength of the basic structure of the rotating handrail 15, controls the opening and closing width of the door 17, and extends its service life. [Explanation of symbols]

[0040] 10 beds 11 Bed Frame 12 legs 13 Fixed handrail 14 Board material 15 Rotating handrail 16 Lattice 17 doors 18 rod 20 Upper pivot structure 21 Lower pivot structure 22 Support rod 23 tube 24 Long axis 25 Short axis 26 holes 27 Center attachment structure 30 Safety mechanism 31 Positioning piece 32 recess 33 Convex part 34 Handle 35 Ring body 36 Thin neck 37 Sphere 38 Oblique hole 39 Reinforcement 40 Rotation axis base 41 Main Unit 42 Pedestal 43 Extension part 44 Containment Room 45 through holes 46 Screw hole 47 Fasteners 48 Ball tank 49 Horizontal tank 50 Assembly Room 51 Wall 52 Slide groove 53 Bottom 54 Separation part 55 Slot 56 Vertical hole 60 Positioning hole 61 Small diameter step 62 Spring tank 63 Covering part 64 Shoulder 70 push button 71 keys 72 pins 73 Perforation 74 Hook piece 75 Tongue piece 76 Inner pillar 77 Elastic Members 78 Positioning hole 79 Lock hole 80 rod 81 Male thread step 82 Washer 83 Nut 84 Spring 85 tongue and groove 86 Head 87 Sleeve 90 Fasteners 91 Washer 92 Bush 93 Washer

Claims

1. A lattice (16), a door (17), a positioning piece (31), and a rotation axis base (40). A safety mechanism for a rotating handrail, comprising a positioning hole (60), an assembly chamber (50), a handle (34), a rod (80), a push button (70), and a tongue (75), The door (17) is rotatably installed on one side of the grille (16), The positioning piece (31) is fixed between the grille (16) and the door (17), A plurality of recesses (32) are formed on the periphery, and a plurality of protrusions (33) are formed at equal intervals, separated by each of the recesses (32); The rotary shaft base (40) is disposed between the door (17) and the lattice (16), a body (41) that can rotate relative to the positioning piece (31); The positioning hole (60) is provided inside the main body (41), rotates with the main body (41), and corresponds to the recess (32) of the positioning piece (31); The assembly chamber (50) is provided inside the main body (41), and the positioning communicating with the hole (60); The handle (34) is swingably attached to the body (41); The rod (80) is inserted into the positioning hole (60) and has a spring-out function, one end of which is connected to the handle (34) and extends from the body (41), and the other end of which can be inserted into the recess (32) of the positioning piece (31). When the handle is pulled up, the rod (80) is released from the recess (32). The push button (70) is installed in the assembly chamber (50) and projects in a direction different from the direction in which the handle is pulled up. The push button (70) includes a tongue (75). The tongue (75) is provided so as to extend outward and straddle the positioning hole (60), The tongue (75) has a lock hole (79) through which the rod (80) is inserted, When the tongue (75) does not interfere with the rod (80), the handle (34) can be pulled up, and when the tongue (75) prevents the rod (80) from being inserted into the lock hole (79), the handle (34) is restricted from being pulled up, thereby preventing the door (17) from being opened without permission.

2. The rod (80) has a head (86) with a larger diameter; The head (86) is freely inserted into the lock hole (79), The tongue (75) does not interfere with the rod (80) and allows the handle (34) to be pulled up; The safety mechanism for a rotating handrail as described in claim 1, characterized in that the tongue (75) obstructs the head (86) and the rod (80) prevents the handle (34) from being pulled up.

3. The assembly chamber (50) communicates with the positioning hole (60) through an elongated hole (55) and a vertical hole (56), and a separation portion (54) is provided between the elongated hole (55) and the vertical hole (56); The push button (70) includes a hook piece (74), The safety mechanism for a rotating handrail as described in claim 1, characterized in that the hook piece (74) extends outward from the push button (70), the hook piece (74) is hooked onto the separation part (54) through the vertical hole (56), holding the push button (70) in a pressed state, and the elongated hole (55) guides the tongue piece (75) to insert it deeply into the positioning hole (60), restricting the rod (80) from passing through the lock hole (79).

4. The assembly chamber (50) communicates with the positioning hole (60) through an elongated hole (55) and a vertical hole (56), and a separation portion (54) is provided between the elongated hole (55) and the vertical hole (56); The push button (70) includes a hook piece (74), The safety mechanism for a rotating handrail as described in claim 1, characterized in that the hook piece (74) and the tongue piece (75) are inserted into the push button (70), the hook piece (74) is hooked onto the separation part (54) through the vertical hole (56), holding the push button (70) in a pressed state, and the elongated hole (55) guides the tongue piece (75) and causes it to be inserted deeply into the positioning hole (60), restricting the rod (80) from passing through the lock hole (79).

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