JPH0546461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a self-lock release device for screws used in jacks, water gates, etc.

(Prior Art) Conventionally, an example of a device using a spindle rod member in which a worm is formed is a spindle-type water gate opening/closing device. This opening/closing operation is performed by a driving means such as an electric motor. As a device for lowering a water gate using its own weight, for example, there is a water gate opening/closing device disclosed in Japanese Patent Publication No. 55-26252 and the invention, as shown in FIG. 51 and a clutch shaft 52 are connected via a conical clutch 53, and the pin rack 5
A driven shaft 5 having a drive gear formed at one end that meshes with 4.
5 and a clutch shaft 52 are interlocked via a deceleration spur gear 56 and a stepped spur gear 57, the clutch shaft 52 is equipped with a centrifugal brake 58, and a manual rotation handle is engaged via a gear clutch. .

The self-weight lowering of the sluice gate attached to the pin rack 54 is made possible by the clutch rod 52 being disengaged from the conical clutch 53, and the centrifugal brake 58
It descends to a constant speed by the operation of . When normal opening and closing operations are performed by the electric motor 50, they are self-locked by the worm shaft 59, conical clutch 53, and magnetic brake.

(Problems to be Solved by the Invention) In this way, in the spindle-type opening/closing device, the self-lock of the spindle rod member is released and the self-locking of the spindle rod member itself or the weight of the water gate attached to the spindle rod member, for example, is used to release the self-lock. It is impossible to lower the rack by holding it, and the pin rack type has the problem that it has a very complicated structure as described above.

The purpose of the present invention is to solve the above problems.
The self-lock is released by keeping the rotation of the stem nut that moves the male screw rod member up and down and the starting gear meshed with the male screw rod member constant, and moving the stem nut downward from a predetermined position.
To provide a self-lock release device for a screw which allows a male screw rod member to lower under its own weight and has a simple structure.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes a male screw rod member, a stem nut rotatably embedded in the device body and screwed to the male screw rod member. a driven gear is formed on the outer circumferential surface of the stem nut, a transmission gear is meshed with at least one surface of the driven gear, a starting gear that gives rotation to the transmission gear via an intermediate gear is meshed, and the starting The gear is meshed with the forward male threaded rod member, and the stem nut is provided so as to correspond to one rotation for one tooth rotation of the activation gear.

(Function) With this configuration, in order to lower the male threaded rod member by its own weight, the stem nut is first lowered. When the stem nut is lowered, the male threaded rod member is lowered, imparting rotation to the starter gear, and this rotation drives the passive gear from the transmission gear via the intermediate gear, thereby rotating the stem nut. Due to this rotation, the teeth formed on the stem nut and the threads of the male threaded rod member are in a position where they do not come into contact with each other. That is, the self-lock is released. Additionally, the threads of the male threaded rod member apply downward gravity to the activation gear to cause it to rotate. As this operation continues, the stem nut rotates, so that the weight of the male threaded rod member can be lowered by releasing the self-lock with a simple structure.

(Example) An example of the present invention will be described in detail below based on the drawings.

1 and 2 show a self-lock release device 1 according to the present invention, which is used to open and close a water gate 2. As shown in FIG. As is well known, the water gate 2 is installed on the upper part of the dam 3 so as to open and close the water channel 4 provided in the dam 3. The device mentioned here is
This is the self-lock release device 1 of the present invention.

The lower end of a male screw rod member 6 having a screw 5 formed thereon is attached to the water gate 2, and this male screw rod member 6 has a female screw shape and forms a screw groove 7 corresponding to the screw 5. The stem nut 8 is screwed into the stem nut 8. The width of the teeth 9 of the female threaded stem nut 8 is formed to be slightly narrower than the width of the thread groove 10 of the thread 5 of the male threaded rod member 6.

This stem nut 8 is inserted into a mounting hole 12 in a device main body 11 provided for attaching each member so that it can rotate via two bearings 13, 13, upper and lower, and can also slide slightly in the vertical axis direction. has been incorporated into. A thrust bearing 14 is located on the circumferential surface of the lower end of the stem nut 8,
Furthermore, a ring member 16 having an inclined surface 15 formed in one direction on the circumferential surface of the lower end is fitted into a mounting hole 18 formed with the same diameter across a space 17 from the mounting hole 12 of the device main body 11. However, it is provided so that it can slide slightly in the vertical direction together with the stem nut 8 and the thrust bearing 14. A passive gear 19 forming a spur gear is integrally provided on the outer circumferential surface of the stem nut 8 , and a drive shaft 20 is provided at one location on the outer circumferential surface of the passive gear 19 so as to protrude into the space 17 of the device main body 11 . Fixed drive gears 21 are in mesh. The drive shaft 20 is rotatably supported within the device main body 11, and a bevel gear 22 is fixed to one end of the drive shaft 20. The bevel gear 22 meshes with another bevel gear 23 and connects to the drive handle 24. connected. A transmission gear 26 fixed to a transmission shaft 25 so as to protrude into the space 17 meshes with another part of the outer circumferential surface of the passive gear 19.
A transmission shaft 25 is rotatably supported within the device main body 11. A bevel gear 27, which is an intermediate gear, is fixed to one end of the transmission shaft 25, and meshes with a bevel gear 29 integrated with a starting gear 28, which is fixed to a shaft 28a and pivotally supported by opposing mounting frames 28b, 28b. The starting gear 28 is connected to the screw 5 of the male screw rod member 6.
They are looking shy. The engagement between the starting gear 28 and the screw 5 is such that there is a sufficient amount of mesh between the teeth 30 of the starting gear 28 and the screw 5.
The width of the screw groove 10 of the screw 5 is narrower than the width of the screw groove 10 of the screw 5. Starting gear 28 formed in this way
and the rotation ratio of the stem nut 8 is the starting gear 28.
The stem nut 8 is connected so as to make one rotation around the screw 5 for each rotation of one tooth 30 .

Along the inclined surface 15 of the ring member 16 located below the stem nut 8, as shown in FIG. 3, a substantially U-shaped wedge member 31 is located. At approximately the center of this wedge member 31, an elongated hole 32 is formed which has a large outer diameter and is long in one direction, and the inclined surface 1 of the ring member 16 has a large outer diameter.
Opposite inclined surfaces 33 are formed so as to be able to abut in equilibrium with 5. The bottom surface opposite from the inclined surface 33 is in contact with the floor surface 34 of the space 17 formed in the device main body 11, and the inclined surface 3 of the wedge member 31
One end of a drive shaft 35 is loosely rotatably engaged with the higher part of the drive shaft 35, and a screw formed on the drive shaft 35 engages with a screw hole 36 of the device main body 11, and is fixed to the other end. By rotating the drive handle 37, the wedge member 31 is moved to the third position.
It is provided so that it can slide left and right as shown in the figure, and the stem nut 8 can move up and down.

In the embodiment, the two drive handles 24 and 37 are shown to be manually operable, but they may also be connected to an electric motor.

Next, its effect will be explained.

The self-lock release device 1 shown in FIG.
It is in a self-locked state. That is, as shown in FIG. 4, the teeth 9 of the stem nut 8
contacts the screw 5 so as to lift up the male threaded rod member 6, while the teeth 30 of the starting gear 28 do not contact the screw 5 as shown in FIG. 5 and are subject to downward gravity. do not have. In order to lower the water gate 2 under its own weight from this state, the self-lock must be released. To do this, by rotating the drive handle 37, the wedge member 31 is moved in the direction in which the drive handle 37 is located. At this time, since the inclined surface 33 of the wedge member 31 slides on the inclined surface 15 of the ring member 16, the ring member 1
6, the stem nut 8 is lowered by the vertical displacement caused by the inclined surface 33 of the wedge member 31.
Due to this displacement, the teeth 9 of the stem nut 8 change from the state shown in FIG. However, exactly screw 5
It is located in the middle of the threaded groove 10. In this way, the self-lock is released, and due to the weight of the water gate 2, the male threaded rod member 6 is lowered by the displacement thereof. At this time, the tooth 30 of the starting gear 28
As shown in FIG. 7, the screw 5 of the male screw rod member 6 is
As a result, it receives gravity downward, so it rotates by the amount of displacement, and this rotation is transmitted from the bevel gear 27, which is an intermediate gear, to the transmission shaft 25, and from the transmission gear 26 fixed to the transmission shaft 25 to the passive gear 19. As a result, the stem nut 8 is rotated, and the teeth 9 of the stem nut 8 are further rotated to be in the middle position of the thread groove 10 of the screw 5, and the male threaded rod member 6 is lowered. Since such operations continue, the water gate 2 can be lowered by its own weight. When lowering the water gate 2, if you want to stop the lowering halfway depending on the opening degree, you can rotate the drive handle 37 and move the wedge member 31 away from the drive handle 37, thereby tightening the stem nut. 8 rises.

The teeth 9 of the stem nut 8 apply friction to lift the screw 5, as shown in FIG. There is no braking action and the engine can be stopped. In other words, the self-lock has functioned.

Similarly, in order to open and close the water gate 2 while making the self-lock function, after self-locking the stem nut 8 and the male threaded rod member 6 with the wedge member 31, the drive handle 24 is rotated.
Since the water gate 2 can be moved up and down regardless of the weight drop of the water gate 2, the water gate 2 can be lowered due to its own weight by releasing the self-lock, which has a simple structure.

(Effect of the invention) For this reason, the screw of the male screw rod member,
By engaging with the stem nut, a self-locking function is created using the properties of the screw, and the stem nut is moved up and down using the wedge member.
Activation and deactivation of the self-lock function can be controlled. In addition, brakes, a combination of numerous gears,
There is no need for bevel gears, etc., and since the speed reduction function of the screw itself of the male screw rod member can be used, the speed reduction ratio of the assembled gear can be small. Previously, we had relied only on this method, but since the self-lock release of the water gate can be lowered by its own weight with a simple structure using a male screw rod member with a thread formed, it is easy to manufacture, has fewer failures, and is inexpensive. The device can be realized.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing a self-lock release device for a screw according to the present invention, and FIG.
-A is a top view indicated by A, FIG. 3 is a schematic sectional view indicated by arrow B-B in FIG. 5 is a detailed view showing the state of the male threaded rod member and the starting gear when the self-locking function is activated. FIG. 6 is a detailed view showing the state of the male threaded rod member and the stem nut. Figure 7 is a detailed diagram showing the state of the self-locking function being released. Figure 7 is a detailed diagram showing the state of the male threaded rod member and the starting gear when the self-locking function is released. Figure 8 is a detailed diagram showing the state of the conventional pin rack system. FIG. 2 is a plan sectional view showing the water gate opening/closing device. DESCRIPTION OF SYMBOLS 1...Screw self-lock release device, 6...Male screw rod member, 8...Stem nut, 11...Device main body, 19...Passive gear, 26...Transmission gear, 2
8...Start gear.

Claims (1)

[Claims] 1. A male screw rod member and a stem nut rotatably embedded in the device body and screwed to the male screw rod member are provided, a passive gear is formed on the outer peripheral surface of the stem nut, and at least one surface of the passive gear is provided. A transmission gear is meshed with the transmission gear, a startup gear that provides rotation via an intermediate gear is meshed with the transmission gear, and the startup gear is meshed with the forward male screw rod member, and one of the teeth of the startup gear is meshed with the transmission gear. 1. A self-lock release device for a screw, characterized in that the stem nut is provided to correspond to one rotation for one minute rotation.