JPH035518Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is designed to suspend underwater observation equipment such as underwater sonar underwater with a towing cable through a moonpool installed in the hull of the ship. The present invention relates to a locking mechanism for locking underwater observation equipment to a lifting and retrieving device that is movable up and down in a moon pool for suspending and retrieving underwater observation equipment.

[Conventional technology and its problems]

In general, sonar detection from a ship has a limit in terms of water depth, so when detecting deep sea areas, the sonar' is suspended from the ship's hull S by a towing cable as shown in Figure 16. A method is adopted in which detection is carried out while towing the vessel at a predetermined depth. A known method for suspending such a sonar underwater is to provide a moonpool 1 (upper and lower through holes) in the hull and suspend and retrieve the sonar through this moonpool. Compared to the method of hanging from outside the shipboard,
This method has various advantages, such as short lifting and retrieving time and the ability to perform detection without impairing the performance of sonar, etc., and has been widely adopted not only for sonar but also for suspending submersible chambers of submersibles, etc. There is. When suspending and retrieving sonar using this method, the following considerations must be made.

(1) The direction in which the sonar is carried is not constant due to the tidal current, so the towing cable guide (guide sheep, etc.) installed near the bottom outlet of the moon pool must be able to turn and follow the towing direction.

(2) In addition to the turning tracking function of the towing cable guide,
The sonar must be able to be raised and lowered smoothly and safely within the moonpool.

(3) When detecting shallow waters, the sonar must be fixed to the hull for use.

In order to create a suspended lifting and retrieving device that satisfies these conditions, the inventors of the present invention have installed an elevating table in the moonpool so that it can be raised and lowered, and that it has a cable guide and is configured to be able to lock underwater observation equipment at the bottom. We are currently considering a suspended lifting and retrieving device with a structure in which a suspended lifting and retrieving platform is rotatably held at the bottom of an elevating table. This type of device allows the underwater observation equipment, which is fixed to the lower part of the suspended hoisting platform, to be raised and lowered safely within the moon pool using the lifting table, and also by rotating the hanging hoisting platform. It is possible to follow the cable guide in the cable towing direction, and furthermore,
It has the advantage of being able to use underwater observation equipment fixed to the hull by anchoring the device to the bottom of the ship, making it extremely useful for putting the moonpool system into practical use. can.

The present invention aims to provide a locking mechanism for underwater observation equipment suitable for such a suspended lifting and retrieving device.

[Means and actions to solve the problem]

For this reason, the present invention has a claw part at the lower end that can be engaged with the upper part of the underwater observation equipment, a contact part that the rising underwater observation equipment should come into contact with, and an opening at the bottom that should accommodate the underwater observation equipment. A claw lever is rotatably installed vertically on the main body of the hanging hoisting device through its upper end facing the space, and a hanging hoisting device is used to hold the claw lever in the locked and unlocked rotational positions. The lock device consists of a cylindrical body provided with a plurality of wedge-shaped engaging steps at equal intervals along the inner circumference, and a spring receiver and a stopper ring on the outer periphery. It has an abutting part to be abutted on the rear end,
A rod body whose tip is pivotally connected to the lower end of the pawl lever and is inserted into the main body so as to be able to move forward and backward in the longitudinal direction; and a spring which is interposed between the spring receiver and the main body and applies a pressing force to the rod body in the direction of the tip. , has a plurality of engaging protrusions that protrude in the radial direction and have a wedge-shaped front end surface at equal intervals in the outer circumferential direction so as to engage and abut the engaging step part of the main body, and the rod body in the main body rotates. A stopper ring that is externally inserted so as to be able to slide in the longitudinal direction of the rod body comes into contact with the top side portion of the front end surface of the stopper ring engagement protrusion at the main body engagement step position or the position between the engagement steps, thereby causing the rod body to retreat. Its basic feature is that it consists of a stopper ring attachment/detachment member or a stopper ring attachment/detachment part provided on the outer periphery of the rod body opposite to the stopper ring in order to push the stopper ring in the backward direction of the rod body.

In such a locking mechanism of the present invention, the claw portion of the claw lever engages with the upper part of the underwater observation equipment, and locks it to the lower part of the suspension platform. The engagement and disengagement of the underwater observation device from the claw lever is automatically performed by rotating the claw lever by moving the underwater observation device up and down. With the claw lever held in the unlocked rotating position (rotated outward) by the locking device, pull up the underwater observation equipment with the towing cable and rotate the claw lever up and down at the top of the tow cable. Then, the holding state of the rod body constituting the locking device is released, and the rod body advances toward the pawl lever due to the pressing force of the spring, thereby rotating the pawl lever inward. As a result, the claw portion of the claw lever engages and locks the engagement stage provided on the underwater observation device. When the underwater observation device is raised from such a locked state to a predetermined height, the claw lever is rotated outward, and then lowered, the rod body resists the elastic force of the spring and moves in the direction opposite to the claw lever. It is moved backwards and locked in the reversed position. This locks the pawl lever in the unlocked rotational position.

〔Example〕

1 to 15 show an embodiment of the present invention.

The suspension lifting and retrieval device in this embodiment is composed of a lifting table 2 that is provided so as to be able to rise and fall within the moon pool 1, and a hanging lifting and collecting table 3 that is rotatably held at the bottom of the lifting table. .

The elevating table 2 holds a suspension hoisting table 3 to be described below to suppress its movement, and has a plurality of legs 30 at its lower part and an insertion hole 31 for a towing cable in its center. Elevating table 2
has guide rollers 32 at a plurality of locations in the circumferential direction, and can be raised and lowered by the guide rollers 32 along guide rails 33 provided vertically within the moon pool 1. The table, which can be raised and lowered within the moonpool in this way, is suspended from the bottom H of the ship by setting a lifting platform 3 when the underwater observation equipment is being towed or fixed to the ship.

The suspended hoisting platform 3 is equipped with a towing cable guide (guide sheave, etc.) inside its main body, and has a towing cable insertion hole 3 inside at the upper center.
4 is formed, and a neck portion 35 having a collar portion 36 in the upper circumferential direction is provided protrudingly, and the neck portion 35 is inserted into the insertion hole 31 of the elevating table 2, and a swing bearing is attached to the collar portion 36 and the peripheral edge of the insertion hole. 37, it is rotatably held at the lower part of the lifting table 2. The main body of the suspended hoisting platform 3 has a space inside thereof in which a towing cable can be inserted in the vertical direction, and also has a space 7 in the skirt-like open lower part for accommodating the upper part of the underwater observation equipment. . Note that the hanging lift and storage table 3 is rotationally driven with respect to the lifting table 2 by a suitable drive mechanism. Such an elevating table 2 and a hanging hoisting table 3
is raised and lowered within the moonpool 1 by a towing cable for underwater observation equipment that is anchored at the bottom of the moonpool.

In the above-mentioned hanging hoisting and collecting device, the locking mechanism A of the present invention includes a claw lever 4 provided inside the open lower part of the hanging hoisting platform 3 and a locking device 5 for the claw lever.
It is composed of.

The claw lever 4 has an upward claw portion 6 at its lower end that is to be engaged with an engagement stage formed on the upper part of the underwater observation device.
By having its upper end pivoted 8 to the main body of the suspension hoisting platform, it is rotatably installed vertically facing the space 7 for accommodating underwater observation equipment at the lower part of the hanging hoisting platform. A contact portion 9 is provided at a position near the upper end of the pawl lever 4, with which a raised underwater observation device abuts and rotates the lever pawl 4 outward. In this embodiment, this contact portion 9 is constituted by a rotatable roller body.

The locking device 5 is for holding the pawl lever 4 in a predetermined rotational position for locking and unlocking, and as shown in FIGS. Rod body 1 inserted so that it can move forward and backward
1. A spring 12 for applying a pressing force to the rod in the direction of the pawl lever, a stop ring 13 rotatably attached to the rod inside the main body and slidable in the longitudinal direction of the rod, and a stopper ring 13 for retracting the rod. It is comprised of a stopper ring attachment/detachment member 14 provided on the outer periphery of the rod body so as to face the stopper ring so as to push and move the stopper ring.

As shown in FIGS. 4 and 5, the cylindrical main body 10 (casing) is provided with a plurality of wedge-shaped engaging step portions a at equal intervals along its inner circumferential direction. This engagement step part a is formed in a wedge shape in the longitudinal direction of the main body, and in this embodiment, protrusions B along the longitudinal direction of the main body are provided at equal intervals on the inner surface of the main body, and the ends of the protrusions B , vertical plane e ₁ (plane perpendicular to the radial direction of the main body)
A wedge-shaped engaging step portion a is formed, which includes a slope e 2 and an inclined surface e ₂ .

Approximately at the center of the protrusion B, along the longitudinal direction of the protrusion B, an inner surface on one side is a vertical surface e ₁ of the wedge-shaped engagement step a.
A continuous groove c is formed, and protrusions b ₁ and b ₂ are formed on both sides of the groove c. The groove c guides the protrusion on the outer periphery of the stopper ring attachment/detachment member 14.

The end portion of the protrusion B (corresponding to the end of the protrusion b ₁ ) forming the vertical surface e ₁ of the wedge-shaped engagement step includes:
Slanted surface e of engagement step a Slanted surface h in the same inclination direction as ₂
is formed. The portion between the engaging step portions a forms a slide space d in which the engaging step portion a engages the engaging protrusion of the stopper ring and allows the stopper ring to slide in the longitudinal direction of the main body. . In this embodiment, this slide space d is formed in the shape of a groove between each protrusion B.

The rod body 11 has flanges 15 at two locations in the longitudinal direction.
a, 15b. Of these, the flange portion 15a on the tip side constitutes a contact portion 16 for abutting against and moving the stopper ring attachment/detachment member 14. Further, the rear surface of the flange portion 15b on the rear end side is a spring receiving portion 17 for receiving one end of the spring 12.
The front surface constitutes an abutting portion 18 which is to abut against the rear end of the stopper ring 13. The rod body 11 is inserted into the main body 10 and is held by the inner flange portion of the main body so as to be able to move forward and backward in the longitudinal direction.

The spring 12 is externally inserted into the rod body portion on the rear end side of the flange 15b, and both ends engage with a spring receiving portion 17 of the rod body 11 and a flange portion 19 formed inside the main body.

The stopper ring 13 is shown in FIGS.
As shown in FIG. 1, a plurality of engagement protrusions 20 protruding in the radial direction that are to engage and come into contact with the wedge-shaped engagement step a on the main body side are provided at equal intervals in the outer circumferential direction. This engaging protrusion 2
The front end surface f of 0 is inclined so that it can come into contact with the inclined surface _e2 of the engagement step a. In this embodiment, sawtooth-shaped uneven portions to be engaged with the end surface of the stopper ring attachment/detachment member are formed in the circumferential direction of the front end surface of the stopper ring body.

Such a stopper ring 13 is configured to have a diameter such that the outer diameter of its main body can be located inside the protrusion B,
It is rotatably and longitudinally slidably fitted onto the rod body 11 so that its front end face faces the engaging step portion a.

The stopper ring attachment/detachment member 14 comes into contact with the top side of the inclined front end surface of the stopper ring engagement protrusion 20 located at the main body engagement stepped portion position or the position between the engagement stepped portions, and presses the stopper ring 13 in the rod body backward direction. It is a device for moving, and in this embodiment, it is configured in a ring shape. As shown in FIGS. 6 to 8, this stopper ring attachment/detachment member 14 has protrusions 21 (protrusions) at equal intervals at a plurality of locations in the circumferential direction of its outer surface to abut against the engagement protrusions 20 of the stopper ring 13. ing. These plurality of protrusions 21 are located in the groove c and the slide space d inside the main body, and are configured to engage with the engagement protrusion 20 located at either the engagement step a or the slide space d. There is. The end face of the protrusion 21 facing the stopper ring is formed into a mountain shape, and one slope g thereof is adapted to abut on the top side of the inclined front end face f of the engagement protrusion 20. In the present invention, when the protrusion 21 is brought into contact with the engagement protrusion and the stopper ring 13 is slid in the backward direction of the rod body (towards the rear of the body), the front end surface f of the engagement protrusion is tilted to make use of its inclination. The stopper ring 13 is thereby rotated, and the engaging protrusion 20 is moved from the engaging step position to the inter-engaging step position in the circumferential direction of the main body, or from the inter-engaging step position to the position between the engaging steps. This is to displace it to the engagement step position. Therefore, in order to obtain such an effect, the protrusion 21 needs to be configured so as to come into contact with the top side portion of the front end surface f of the engagement protrusion. Incidentally, the end face of the member main body on the side facing the stopper ring 12 is formed with similar sawtooth-like uneven portions that come into contact with the sawtooth-like end face of the stopper ring main body.

Such a ring-shaped stopper ring attachment/detachment member 14 is configured to have a main body outer diameter such that it can be positioned inside the protrusion B, and faces the stopper ring 13, and each protrusion 21 is located within the groove c and the slide space d. The rod body 11 is fitted over the rod body 11 so that the rod body 11 is positioned at the same position as the rod body 11, and by coming into contact with the abutment portion 16 of the rod body 11, the rod body is moved in the stoppering direction as the rod body retreats.

Note that instead of the stopper ring attachment/detachment member 14 being independent of the rod body 11 as in this embodiment, a structure may be adopted in which the stopper ring attachment/detachment part having the protrusion is integrally formed on the outer periphery of the rod body.

The main body 10 of such a locking device 5 is slidably pivoted 22 to the suspension hoisting platform 3, and the rod body 1
The tip of the lever 1 is pivotally attached 23 to the lower end of the claw lever 4.

A rod body operating mechanism 24 is attached to the rear end of the main body in case a problem occurs in the forward and backward movement of the rod body 11. That is, a threaded portion 25 is provided at a portion near the rear end of the rod body 11, and a pinion 26 having a threaded hole 27 in the center is attached to the threaded portion 25 through the threaded hole 27. Furthermore, a pinion 28 that meshes with the pinion 26 is rotatably provided on the side of the main body, and can be rotated by an operating handle 29.
Also, the pinion 26 on the rod body 11 is the pinion 2
It is designed to be able to slide against 8. In such a mechanism, the pinion 26 on the rod body 11 is rotated by the operation handle 29 via the pinion 28, and the threaded portion 25 screwed into the threaded hole 27 is rotated.
The rod body 11 is moved forward and backward through the rod body 11.

In addition, FIGS. 14 and 15 show the elevating table 2.
This shows an example of a drive mechanism for rotating the suspended lifting platform 3, in which an endless chain body 39 is rotatably provided in the vertical direction of the moon pool 1 by sprocket wheels 38a and 38b. A sprocket wheel 40 pivotally supported by the elevating table 2 is engaged with the chain body 39 while being restrained from coming off the chain by a chain holding mechanism 41 consisting of upper and lower guide sprocket wheels 42a and 42b. A chain body 43 (or rack body) is fixed around the outer periphery of the hanging lifting and storage table 3, and a vertical support shaft 4 is attached to the lifting table 2.
A sprocket wheel 45 (or pinion) that engages with the chain body 43 via the sprocket wheel 4 is rotatably provided, and the support shaft 44 and the support shaft 46 of the sprocket wheel 40 are connected to gears 47 and 48 (bevel gears). It is becoming more and more linked. The chain holding mechanism 41 has a support shaft 46 rotatably supporting a bracket 49.
Guide sprocket wheels 42a and 42b are rotatably provided at both ends of the sprocket wheel 40 for bending and guiding the chain body above and below the sprocket wheel 40. The upper and lower parts of the chain 39 are restrained by the inner parts of the guide sprocket wheels 42a and 42b, thereby ensuring an appropriate winding length of the chain around the sprocket wheel 40 and preventing the chain from coming off. In addition, in other drawings, 50 is a chain body drive motor, 51 is a clutch,
52 is a presser roller.

In such a drive mechanism, the motor 50 rotates the chain body 39 to rotate the sprocket wheel 40 engaged therewith, and this rotational force is applied to the chain body 43 through the support shaft and gears. It is transmitted to the sprocket wheel 45, and the hanging lifting platform 3
Rotate.

Next, the operation of the device of the present invention will be explained based on FIGS. 12 and 13. FIG. 13 shows the inside of the lock device 5 expanded, and A to D are the 12th
This corresponds to each state in Figures A to D.

FIG. 12A shows a state in which the underwater observation instrument is not locked, and the pawl lever 4 is held by the locking device 5 in an outwardly rotated state. 13th
Figure A shows the state of the locking device 5 at this time, in which the engaging protrusion 20 of the stopper ring 13 engages with the engaging step a, so that it is locked so that it does not slide in the direction of the pawl lever. As a result, the rod body 11 whose abutting portion 18 abuts against the rear end of the stopper ring 13 is held in a retracted state.

The underwater observation equipment RO which was pulled up into the storage space 7 at the bottom of the suspended hoisting platform by the towed cable has its upper end attached to the claw lever 4 as shown in Figure 12B.
The pawl lever 4 is raised until it comes into contact with the abutting portion 9 of the lever 4 and rotated slightly outward, and then lowered slightly to its original locking position so that the pawl lever 4 returns inward. As a result, the locking state of the rod body 11 by the stopper ring 13 is released, and the rod body 11 moves in the direction of the pawl lever and moves to the pawl lever 4.
12c, the claw portion 6 of the claw lever 4 engages the engagement stage 5 of the underwater observation instrument B.
3 to lock it. Figures 13B and 13C show the locking device at this time, and when the underwater observation equipment RO, which has ascended, rotates the claw lever 4 outward and moves the rod body 11 backward in the direction opposite to the claw lever, the As shown in FIG. 13B, the stopper ring detachable member 14 slides along with the rod body 11 in the direction opposite to the pawl lever, and the protrusion 21 sliding in the groove c engages with the engagement step a. Engagement protrusion 2
0 to move the stopper ring 13 in the same direction. At this time, the protrusion 21 is in contact with the top side portion of the front end surface f of the engagement protrusion. While the engagement protrusion 20 of the stopper ring 13 is engaged with the engagement step a, more specifically, the side surface of the engagement protrusion 20 is in contact with the vertical surface e ₁ forming the engagement step a. It slides as it is without rotating while
When the side surface of the engagement protrusion 20 moves to a position where it deviates from the vertical plane _e1 , the restriction by the engagement step a is removed, so the inclined front end face f of the engagement protrusion 20 slides relative to the protrusion 21. As a result, stopper ring 1
3 rotates by a predetermined angle (1/32 rotation in this embodiment). FIG. 13B shows the state after this rotation.
This rotation causes the engagement protrusion 20 to shift from the position of the engagement step a in the circumferential direction of the main body. When the claw lever 4 is released from the underwater observation device by slightly lowering the underwater observation device to its original locking position, the rod body 11 advances toward the claw lever due to the action of the spring 12, and the stopper ring 13 is released from the underwater observation device. It moves in the circumferential direction along with the rod body 11 via the contact portion 18.
The engagement protrusion 20 of the stopper ring 13 slides on the slope h of the protrusion B and enters the slide space d between the engagement steps a, whereby the stopper ring 13
The main body also slides in the direction in which the rod body advances, and in conjunction with this, the rod body 11 also advances in the direction of the pawl lever. FIG. 13C shows this state.

From the state in which the underwater observation equipment B is locked in this way, as shown in Fig. 12D, the equipment is slightly raised by the towing cable H, and the claw lever 4 is moved outward via the abutment part 9 in the same manner as before. When the claw lever 4 is rotated and then lowered, the pawl lever 4 is held in the unlocked rotation position.

That is, in this case, when the underwater observation device 2 rotates the pawl lever 4 outward and moves the rod body 11 backward in the direction opposite to the pawl lever, the protrusion 21 of the stopper ring attachment/detachment member 14 sliding in the slide space d The engaging protrusion 20 inserted into the slide space d is pushed to move the stopper ring 13. At this time as well, the protrusion 21 is in contact with the top side portion of the front end surface f of the engagement protrusion. In this case as well, the stopper ring 13 is operated while the engagement protrusion 20 is moving within the slide space d, more specifically, while the side surface of the engagement protrusion 20 is in contact with one side surface of the protrusion B. slides as it is without rotating, but when the side surface of the engagement protrusion 20 moves to a position where it is removed from the side surface of the protrusion B, the restraint is removed and the front end surface f of the engagement protrusion 20 becomes a protrusion as before. As shown in FIG. 13D, the stopper ring rotates by a predetermined amount (1/32 rotation in this embodiment), and the engaging protrusion 20 is displaced from the position of the slide space d in the circumferential direction of the main body. , a portion of its front end face f faces a portion of the engagement step portion a.
When the claw lever 4 is released from the underwater observation equipment B by lowering it, the rod body 11 advances toward the claw lever, and the engaging protrusion of the stopper ring 13 moves along with this. 20 is engaged with the engagement step a by sliding on the inclined surface _e2 .
As a result, the rod body 11 is held in the state shown in FIG. 13A, and the pawl lever 4 is held in the unlocked state (FIG. 12A).

It should be noted that the present invention is not limited to the structure of the above-described embodiments, but can be applied to a suspended hoisting and retrieval device having an appropriate structure provided in a moon pool.

[Effect of idea]

According to the present invention described above, there is an advantage that the underwater observation equipment can be automatically engaged and disengaged from the lower part of the suspension hoisting and retrieving device simply by lifting and lowering the equipment.

[Brief explanation of drawings]

Figures 1 to 15 show an embodiment of the present invention, in which Figure 1 is a vertical cross-sectional view of a hanging lifting device, and Figure 2 is a vertical cross-sectional view partially showing the device of the present invention. . FIG. 3 is a longitudinal sectional view of the locking device constituting the device of the present invention. 4 and 5 show the cylindrical body constituting the locking device, with FIG. 4 being a cross-sectional view and FIG. 5 being a developed view showing the inner peripheral surface. 6th
Figures 8 through 8 show the stopper ring attaching/detaching member constituting the locking device, and Figure 6 is a plan view;
FIG. 7 is a sectional view taken along the line - in FIG. 6, and FIG. 8 is a developed view showing the outer peripheral surface. Figures 9 to 1
FIG. 1 shows a stopper ring constituting the lock device, FIG. 9 is a plan view, FIG. 10 is a sectional view taken along the line - - in FIG. 9, and FIG. 11 is a developed view showing the outer peripheral surface. FIGS. 12A to 12D are longitudinal sectional views showing the operating state of the device of the present invention in each state. 13th
FIGS. 12A to 12D are developed explanatory views of the operating states of the locking device corresponding to the states shown in FIGS. 12A to 12D. 14th
15 and 15 show an example of a drive mechanism for rotationally driving the hanging lifting platform, FIG. 14 is a longitudinal sectional view, and FIG. 15 is a schematic explanatory diagram. FIG. 16 is an explanatory diagram showing a sonar towing state using the moon pool method. In the figure, 4 is a claw lever, 5 is a locking device,
6 is a claw part, 7 is a space, 8 is a pivot part, 9 is a contact part,
10 is a main body, 11 is a rod body, 12 is a spring, 13 is a stopper ring, 14 is a stopper ring attachment/detachment member, 16, 18 are abutting parts, 17 is a spring receiving part, 20 is an engaging protrusion, 21 is a protrusion, 22 ，
Reference numeral 23 indicates a pivot portion, a indicates an engaging stepped portion, d indicates a slide space, and A indicates a locking mechanism of the present invention.

Claims (1)

[Scope of utility model registration request] In order to suspend and retrieve the underwater observation equipment connected to the towing cable through the moon pool that passes through the hull in the vertical direction, the underwater observation equipment is anchored to the lower part of the suspension retrieval device that is installed in the moon pool so that it can be raised and lowered. It is a locking mechanism for holding the underwater observation equipment, and has a claw part at the lower end that can be engaged with the upper part of the underwater observation equipment, and a contact part that the rising underwater observation equipment should come into contact with. a claw lever rotatably installed vertically on the main body of the suspension hoisting and retrieval device through its upper end facing the lower open space to be used; It consists of a locking device that is slidably installed on the main body of the suspension hoisting and retrieval device. a rod body having an abutting part to be in contact with the rear end of the spring receiving part and the stopper ring, the tip of which is pivotally connected to the lower end of the pawl lever, and inserted into the main body so as to be able to advance and retreat in the longitudinal direction; and a rod body between the spring receiving part and the main body. a spring that applies a pressing force to the rod body in the distal direction; and an engagement protrusion that protrudes in the radial direction and has a wedge-shaped front end surface to engage and abut the engagement step of the main body. A stopper ring having a plurality of rods arranged at equal intervals in the outer circumferential direction and rotatably inserted into the rod body in the main body and slidably in the longitudinal direction of the rod body, and a stopper ring at a position of the main body engaging stepped portion or a position between the engaging stepped portions. A stopper ring attachment/detachment member or a stopper ring attachment/detachment portion provided on the outer periphery of the rod body opposite to the stopper ring in order to press the stopper ring in the backward direction of the rod body as the rod body retreats by coming into contact with the top side of the front end surface of the engagement protrusion. A locking mechanism for underwater observation equipment in an underwater observation equipment suspension lifting device characterized by comprising: