JP3709147B2 - Locking device for fall prevention frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base frame that is attached to a lid receiving frame of an underground structure, a main body frame that is rotatably attached to the base frame, and a front end portion that engages with an engaging portion of the lid receiving frame while covering an opening. In addition, the present invention relates to a fall prevention frame having a slide mechanism that allows the main body frame to move back and forth in order to remove it from the engaging portion.
[0002]
[Prior art]
In general, an opening of an underground structure called a manhole is provided with a fall-preventing frame for preventing a person from falling while being opened for work. There is also an auxiliary ladder for entering and exiting. For example, as disclosed in Japanese Patent Application Laid-Open No. 11-310932, there is a structure that is always set on a lid receiving frame and is fixed in a laid state or a standing state. However, the conventional one is not sufficiently fixed and safe in each state, and sometimes becomes a problem.
[0003]
For example, when there is a water flow that flows backward from the underground, the lid is closed and shaken by the pressure fluid, the auxiliary ladder may fly off the lid and mainly from the lid receiving frame. It is not uncommon for this type of equipment to be left unopened for many years if it is not necessary after installation, so it is not preferable that the auxiliary ladder is easily removed.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and the problem is that the locking device for the fall-preventing frame that can be always set on the lid receiving frame does not come off due to water pressure or the like in the manhole. It is to be able to maintain the state.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a slide mechanism in a fall prevention frame, a long hole that allows the main body frame to move back and forth, a base frame side fixed shaft that is disposed in the long hole, and a lock member that is coaxially attached. In addition, a movable shaft on the main body frame side disposed in the long groove of the lock member, and a holding member that holds the movable shaft in the same position when the movable shaft is fitted into the stop groove from the long groove of the lock member in the engaged state of the main body frame. The pressing member is provided on the rotor attached to the coupling shaft of the lock member, and the rotor receives a force by the biasing means to press the rotor in the direction of sliding from the side toward the long groove. It is a measure that is configured as follows.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The lock device according to the present invention is applied to a fall prevention frame that is attached to a lid receiving frame of an underground structure, covers an opening of the lid receiving frame, and prevents a person or an object from falling. The fall prevention frame may also function as an auxiliary ladder when standing up and down on the lid receiving frame and entering and exiting the opening. This apparatus functions to fix such a fall prevention frame to a position and position covering the opening.
[0007]
The fall prevention frame has a base frame attached to the lid receiving frame. The base frame has a portion that is fixedly or detachably attached to an attachment portion prepared on the manhole cover receiving frame side, and a portion for attaching the main body frame. The part for attaching the main body frame needs to be provided with a shaft, and this shaft is a fixed shaft fixed to the base frame attached to the lid receiving frame.
[0008]
A main body frame is rotatably attached to the base frame. The main body frame has a size and shape that covers the opening of the lid receiving frame, has a coupling portion with the base frame at one end thereof, and engages with the engaging portion of the lid receiving frame at the other end. Has a part for a match. A shaft hole through which a fixed shaft is passed is necessary at the coupling portion with the base frame, and the shaft hole is a long hole that is long in the front-rear direction so that the main body frame can be moved back and forth. Accordingly, the slide mechanism for engaging the distal end portion of the main body frame with the engaging portion of the lid receiving frame in the state in which the fixed shaft of the base frame and the long hole of the main body frame cover the opening, and for removing from the engaging portion. Configure.
[0009]
The slide mechanism is provided with a lock device. Locking arrangement includes the aforementioned fixed shaft and a long groove, further comprising a locking member attached to the fixed shaft, the locking member has a movable shaft which is disposed in the long groove on the body frame side. That is, since the movable shaft needs to move back and forth within a range in which the main body frame can move back and forth, a long groove is provided in the lock member for that purpose.
[0010]
Further, a pressing member is provided that allows the movable shaft to be fitted into the locking groove from the long groove of the lock member in the engaged state of the main body frame, and at that time to hold the movable shaft in the same position. The pressing member presses the movable shaft and is stopped in the stop groove, so that the main body frame maintains the engaged state and cannot be detached from the lid receiving frame.
[0011]
It is desirable that the pressing member be selectable between a position where the movable shaft is pressed and a position where the movable shaft is not pressed, and that the position is held by a positioning means or the like at the position where the movable shaft is pressed. In the case where the movement of the pressing member is restricted between the position where the movable shaft is pressed and the position where the movable shaft is not pressed, the movement is configured so as to be as rattling as possible. Less shakiness is also desired for mounting the lock member to the fixed shaft. This is because if the backlash is large, the lock member and the pressing member may move freely and impair the intended purpose of preventing separation.
[0012]
For this reason, it is desirable that the pressing member is provided on a rotor attached to the coupling shaft of the lock member, and the rotor is integrated with a shaft cylinder supported by the coupling shaft. The shaft tube can minimize the shake of the rotor and the lock member. The positioning means may be an urging means such as a spring.
[0013]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. In each figure, 11 is a manhole iron lid, 12 is a lid receiving frame, 13 is an opening, and a handle 14 for entering and exiting the manhole is provided there.
[0014]
The fall prevention frame 15 includes a base frame 16 and a main body frame 17, and the base frame 16 and the main body frame 17 are coupled to each other by a slide mechanism 18 so as to be movable back and forth and to be mutually rotatable. The base frame 16 is composed of a pair of left and right base frame members 19 and 20 and bonding members 21 and 22 that are coupled to each other at a predetermined interval, and shaft-shaped attachment portions 23 provided on the base frame members 19 and 20, respectively. 24 is fixedly attached to the attachment counterpart 25 of the lid receiving frame 12 with a nut 26 or the like.
[0015]
The main body frame 17 is composed of a pair of left and right side frame members 27 and 28 and a plurality of horizontal frame members 29 for connecting them at a predetermined interval. The side frame members 27 and 28 are formed at the base end portion. The slide mechanism 18 is combined with the base frame 16. The slide mechanism 18 includes a fixed shaft 22 that also serves as a binding material provided in the base frame 16 and a long hole 31 that is provided in the base end portion of the main body frame 17 and that is long in the front-rear direction. In the state where the base frame portion is mounted on the lid receiving frame 12, when the main body frame 17 is extended in a direction to cover the opening portion 13, the base end portion 32 of the main body frame 17 is maintained so as to maintain the posture. A stopper 33 in contact with the part is prepared on the base frame side.
[0016]
A lock device 30 is provided in association with the slide mechanism 18. The lock device 30 has a lock member 34 attached to the fixed shaft 22. The lock member 34 has a long groove 35 in the front-rear direction, and one of the horizontal frames of the main body frame 17 serves as the movable shaft 36 in the long groove 35. Has been placed. A stop groove 37 for locking the movable shaft 36 is provided in the long groove 35 so that the main body frame 17 does not return backward when the main body frame 17 is moved forward, and the movable shaft 36 is fitted in the stop groove 37. A pressing member 38 that presses in the same position is provided in the long groove 35 so as to be able to appear and retract.
[0017]
The pressing member 38 is provided on a rotor 40 that is rotatably attached to a shaft 39 that couples a pair of locking members 34, 34 at a tip end portion. The rotor 40 is integrally welded to the shaft tube 41 which is journalled in the coupling shaft 39, and also by the coil spring is a biasing means 42 MekuSo the coupling shaft 39, the push even member 38 the biases so as to enter from the side to the long groove 35, the pressing member 38 is slid to the rotor 40 in a direction against the biasing force thus exits the elongated grooves 35 laterally.
[0018]
The front end portions 43 and 44 of the main body frame 17 can be engaged with the engaging portion 45 of the lid receiving frame 12 when the main body frame 17 is moved forward. The front end portions 43 and 44 are formed so that the lower sides of the side frame members 27 and 28 are notched in a notch shape and bent inward so as to be stably engaged with the support portion 46 constituting the lower portion of the engagement portion 45. Has been. The upper portion 47 of the engaging portion 45 projects in a shelf shape so that the main body frame distal end portions 43 and 44 that have entered the intermediate engaging portion cannot be removed upward or downward. In the figure, 48 is a stopper provided on the fixed shaft 22 and functions as a stopper for the locking member 34.
[0019]
The locking device 30 in the fall prevention frame 15 having such a configuration is such that when the fall prevention frame 15 is in a state of covering the opening 13 of the lid receiving frame 12, the main body frame 17 is most advanced relative to the fixed shaft 22. The tip portions 43 and 44 are defined as engaging positions with the engaging portion 45. That is, the pressing member 38 of the locking device 30 enters the long groove 35 from the side and prevents the movable shaft 36 fitted in the stop groove 37 from coming out. This state is shown in FIGS. 1 to 3, 6 and 7, and the manhole iron cover 11 can be closed as it is.
[0020]
In this state, for example, when water overflows from the underground structure, an external force that vigorously shakes the fall prevention frame 15 and the iron lid 11 may work. However, in the lock device 30 of the present invention, press even allowed to enter the member 38 to the bottom of the long groove 35 of the movable shaft 36, the movable shaft 36 maintains the state where fitted into locking grooves 37, with even fewer design rattling Therefore, it is unlikely that the lock device 30 is likely to come off.
[0021]
When this is used as an auxiliary ladder, the rotor 40 is moved along the movable shaft 36 in the direction of compression of the winding spring, the pressing member 38 is retracted to the side of the long groove 35, and the rotor 40 is moved around the coupling shaft 39. When the lock member 34 is rotated and the movable member 36 is lifted, the movable shaft 36 is positioned in the long groove 35, so that the main body frame 17 can be pushed backward (FIG. 9). Therefore, the main body frame 17 is pushed rearward, the front end portions 43 and 44 are removed from the engaging portion 45, and then the front end portions 43 and 44 are rotated upward to bring them up (FIG. 4). Since the fixed shaft 22 in a standing state it is located at the upper end of the long hole 31 of the body frame 17, proximal end 32 of the body frame 17 is positioned on the inner side of the coupling member 21 of the base frame 16 (FIG. 4), upright position It can be used to enter and exit the manhole. The distance from the binding material 21 to the base end portion 32 is shorter than the length of the long hole 31 of the main body frame 17, and when the main body frame 17 is pulled up, it is easily returned to the position as the fall prevention frame 15 covering the opening 13. be able to.
[0022]
【The invention's effect】
Since the present invention is configured and operates as described above, particularly in the locked state, since the movable shaft fitted in the stop groove is pressed by the pressing member, even if the water pressure in the manhole works The fall prevention frame can be locked in a position that covers the opening without being affected by movement or coming off, and it does not come off due to water pressure in the manhole, etc. There is an effect of holding.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a locking device in a fall prevention frame according to the present invention.
FIG. 2 is also a plan view.
FIG. 3 is a central sectional view showing a usage state of the fall prevention frame.
FIG. 4 is a central cross-sectional view showing a use state as an auxiliary ladder.
FIG. 5 is an enlarged perspective view of a fall prevention frame.
FIG. 6 is a partial plan view showing an operating state of the locking device.
FIG. 7 is a partial perspective view of the same.
FIG. 8 is a partial plan view showing a state in which the locking device is released.
FIG. 9 is a partial perspective view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Manhole iron lid 12 Lid receiving frame 13 Opening part 15 Fall prevention frame 16 Base frame 17 Main body frame 18 Slide mechanism 22 Fixed shaft 31 Long hole 34 Lock member 35 Long groove 36 Movable shaft 37 Stop groove 38 Holding member 39 Coupling shaft 40 Rotor

Claims (3)

A base frame that is mounted on the lid receiving frame of the underground structure, a main body frame that is rotatably attached to the base frame, and a front end portion that engages with the engaging portion of the lid receiving frame so as to cover the opening. In the fall prevention frame having a slide mechanism that allows the main body frame to move back and forth in order to remove it from the joint portion, the slide mechanism has a long hole that allows the main body frame to move back and forth, and a base frame side disposed in the same long hole. When the movable shaft is fitted into the locking groove from the long groove of the lock member in the engagement state of the fixed shaft, the lock member coaxially attached, the movable shaft on the main body frame side disposed in the long groove of the lock member, A holding member that holds the movable shaft in the same position is provided, and the holding member is provided on the rotor attached to the coupling shaft of the lock member, and the rotor is directed toward the long groove from the side by the biasing means. You will receive a force to push in the sliding direction Lock apparatus in fall prevention frame configured to.   The fall-preventing frame according to claim 1, wherein the pressing member can be selected between a position where the movable shaft is pressed and a position where the movable shaft is not pressed. Locking device in. The locking device for a fall prevention frame according to claim 1 or 2, wherein the rotor is integral with a shaft cylinder supported by the coupling shaft, and the urging means is a winding spring wound around the coupling shaft .

Images