JP3292790B2 - Variable speed rotary damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, as a shaft for rotatably supporting a door provided at a take-out opening of a vending machine, and a speed at which the door rotates in a closing direction to a predetermined opening degree. And a speed change damper capable of varying the speed at which the door turns in the closing direction thereafter.

[0002]

2. Description of the Related Art In recent years, a large number of vending machines have been installed for the purpose of selling soft drinks and the like that have been loved.
And in the outlet to take out the products of the vending machine,
In consideration of hygiene and the like, a door for maintaining the closed state is provided, and when the product is taken out, the door is opened to take out the product.

FIG. 4 is a partial perspective view showing a take-out port of the vending machine described above. In FIG. 4, S indicates a vending machine, and a take-out opening H for taking out a product is provided with a door D which can be opened and closed. The door D is urged by a spring (not shown) so as to close the outlet H. C indicates a cup, for example, into which soft drink is poured.

Next, the removal of the cup from the outlet will be described. First, the door D in the closed state shown by the solid line is grasped and opened to the open state shown by the dashed line against the urging force of the spring (not shown). Then, when the opening force of the door D is released, the door D is actuated by the urging force of the spring.
Return to the original closed state. Therefore, while the door D is open, the hand is inserted into the take-out opening H to grasp the cup C, and the hand holding the cup C is taken out from the take-out opening H, whereby the cup C is taken out from the take-out opening H. Can be taken out.

[0005]

However, the door D
Is fastened in the closing direction by being biased by the spring, so that the cup D is close to the closed state before the cup C is taken out from the take-out opening H. You may run into C. Therefore, it is necessary to keep the door D open with one hand and take out the cup C with the other hand, then release the open state of the door D and close it, which is inconvenient to use. Was.

Therefore, it is conceivable to use a rotary damper as a shaft of the door D to brake the rotational force for closing the door D.
With a normal rotary damper, the turning speed of the door D at the early stage of closing is faster, and the turning speed of the door D at the end of closing is slower.
After all, there was an inconvenience that it would be inconvenient to use.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned inconvenience, and it is an object of the present invention to provide a variable speed rotary damper in which a shaft rotates at a variable speed by changing a braking force.

[0008]

First, in the variable speed rotary damper according to the first invention, a partition provided with an internal thread on the inner periphery is provided in the middle of the inner periphery in the axial direction, so that the inner portion is formed on the bottom side. A bottomed cylindrical housing which is partitioned into one chamber and a second chamber on the open end side, and a housing recess centered on a female screw is formed on the second chamber side of the partition wall; An external thread that is screwed into, an engagement portion that goes into and out of the accommodation recess is provided,
A shaft having one end protruding from the housing, a rotor housed in the second chamber in a state where the shaft is inserted, and a locking portion provided at an end on the engaging portion side with which the engaging portion is disengaged; And an O-ring disposed at the open end of the housing, which seals the space between the housing and the shaft in a water-tight manner and movably supports the shaft.

Next, in the variable speed rotary damper according to the second aspect of the present invention, a partition provided with an internal thread on the inner periphery is provided in the middle of the inner periphery in the axial direction, so that the interior is formed in the first chamber and the second chamber in the axial direction.
And a cylindrical housing in which a housing recess centered on a female screw is formed on the second chamber side of the partition, and a male screw screwed into the female screw on the outer periphery in the axial direction, and enters and leaves the housing recess. A shaft provided with an engaging portion and provided with a locking flange housed in the second chamber on one end side protruding from the housing; a cap for sealing an open end of the first chamber in a watertight manner;
A first spring that is stretched between the cap and the shaft and urges the shaft toward the cap; and a first spring that is housed in the second chamber with the shaft inserted therethrough and engages with the end on the engagement portion side. A rotor provided with a locking portion with which a portion is disengaged, a second spring loaded between the rotor and the locking flange and biasing the rotor to the partition wall, a viscous fluid filled in the housing, An O-ring disposed at an open end of the housing, which is located at one end side of the shaft from the locking flange, for sealing the space between the housing and the shaft in a water-tight manner and movably supporting the shaft. is there.

[0010]

According to the variable speed rotary damper of the present invention, when the male screw is screwed into the female screw and the engaging portion projecting from the concave portion is engaged with the locking portion, the shaft is rotated so as to be screwed into the housing. , The rotor also rotates until the engagement portion enters the accommodation recess, that is, until the engagement of the engagement portion with the locking portion is released. Therefore, when the engaging portion engages with the locking portion and the rotor rotates, the braking force on the shaft is large. When the engaging portion no longer engages with the locking portion and the rotor does not rotate, the shaft is not rotated. The braking force is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing components of a variable speed rotary damper according to an embodiment of the present invention. FIGS. 2A and 2B show a state in which the components shown in FIG. 1 are assembled into a variable speed rotary damper. FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2B. FIG. 2A shows a state where the door is closed, and FIG. 2B shows a state where the door is open.

In these figures, reference numeral 1 denotes a housing molded of a synthetic resin. A partition 2 is provided in the middle of the inner periphery of a cylinder having both ends open in the axial direction. It is partitioned into a room 4 and a second room 7.
A female screw 3 is provided on the inner periphery of the partition 2 concentric with the housing 1. Reference numeral 5 denotes a concave portion, which is provided at an end portion of the first chamber 4 serving as a bottom with a diameter larger than the diameter of the first chamber 4, and an annular groove 6 is provided on an inner periphery.

Reference numeral 8 denotes a housing recess, and the first chamber 4 and the second chamber 7
This is a portion formed around the female screw 3 on the second chamber 7 side of the partition wall 2 for partitioning the partition wall 2 into and out of which a projection 13 of a shaft 11 described later enters and exits. Note that the depth of the accommodation recess 8 is greater than the height of the projection 13. Reference numeral 9 denotes a step portion of the second chamber 7, which is a portion to which a rotor 41 described later contacts.

Reference numeral 11 denotes a shaft formed of a synthetic resin. A male screw 12 to be screwed into the female screw 3 of the housing 1 is provided on an outer periphery in the middle in the axial direction.
Protrusions 13 are provided at 90-degree intervals as engagement portions that enter and exit the housing 1.
And a locking portion 16 with which a first spring 31 described later is engaged is provided at the other end. One end of the shaft 11 protruding from the housing 1 has, for example, a rectangular cross section.

Numeral 21 denotes a cap which fits into the concave portion 5 of the housing 1 and is formed of synthetic resin to seal the open end of the first chamber 4 in a watertight manner. Part 22 and locking part 23 with which first spring 31 engages
Are provided. Reference numeral 31 denotes a first spring, which includes a locking portion 16 of the shaft 11 and a locking portion 23 of the cap 21.
And urges the shaft 11 in the direction of the cap 21.

Numeral 41 denotes a rotor formed of a synthetic resin into a cylindrical shape, which is housed in the second chamber 7 of the housing 1 with the shaft 11 inserted therethrough. At the inner periphery of the portion, fitting recesses 42 as locking portions with which the projections 13 engage and disengage are provided at 90-degree intervals. 5
Reference numeral 1 denotes a second spring, which is mounted between the locking flange 14 of the shaft 11 and the rotor 41 and urges the rotor 41 to abut the step 9 of the housing 1.

Reference numeral 61 denotes a silicone oil as a viscous fluid filled in the first and second chambers 4 and 7 of the housing 1. Reference numeral 71 denotes an O-ring. It is loaded between the flange 15 and seals the space between the housing 1 and the shaft 11 in a water-tight manner, and supports the shaft 11 movably.

Next, an example of assembly will be described. First, an O-ring 71 is loaded between the locking flange 14 and the flange 15 of the shaft 11. Next, the shaft 11
, The second spring 51 and the rotor 41 are inserted in this order. Then, the first spring 3 is
After one end of the shaft 1 is engaged and locked, the locking portion 16 side of the shaft 11 is inserted into the second chamber 7 of the housing 1 and the male screw 12 is screwed to the female screw 3.

Next, after pulling out the other end of the first spring 31 from the housing 1 and engaging and locking the locking portion 23 of the cap 21, the first chamber 4 is filled with the silicon oil 61, and then the cap 21 is removed. The annular projection 22 is fitted into the recess 5.
Into the annular groove 6. Then, the rotor 41 is rotated in the direction of protruding from the housing 1 to release the screwing of the male screw 12 with the female screw 3, and the shaft 11 is pulled until the locking flange 14 is located outside the housing 1, and the second chamber 7 is pulled out. After filling silicone oil 61 into the shaft 1
When the male screw 1 is inserted into the housing 1 and the male screw 12 is screwed into the female screw 3, assembly can be performed as shown in FIGS.

Next, the operation will be described. Note that the variable speed rotation damper is used as a rotation axis of the door D shown in FIG. 4, and the housing 1 is mounted on the vending machine S so as to be located above the door D. First, FIG.
When the door D is opened in the closed state of the door D shown in
The shaft 11 rotates in the direction of the arrow X and moves in the direction of protruding from the housing 1, and the protrusion 13 also moves while rotating in the direction protruding from the housing recess 8, and the protrusion 13 contacts the rotor 41.

When the projection 13 rotates while projecting from the accommodation recess 8, the projection 13 slightly moves the rotor 41 in the axial direction against the urging force of the second spring 51,
Although a gap is generated between the stepped portion 9 and the protrusion 13, as shown in FIG. 2B, the protrusion 13 is immediately fitted into the fitting concave portion 42, so that the rotor 41 is biased by the urging force of the second spring 51. The rotor 41 rotates together with the shaft 11 in contact with the portion 9, and the door D shown in FIG. 2B is opened.

Next, when the rotational force for rotating the shaft 11 in the direction of the arrow X is released in the open state of the door D shown in FIG. 2B, the urging force of the first and second springs 31 and 51 or the illustration in FIG. The shaft 11 starts to rotate in the direction of the arrow Y by the biasing force of the spring, which is omitted, and the shaft 11 is screwed into the housing 1. When the projection 13 is no longer engaged with the fitting recess 42, that is, when the projection 13 completely enters the housing recess 8, only the shaft 11 rotates to the position shown in FIG. The door D shown is in the closed state.

When only the shaft 11 rotates as described above, since the shearing resistance of the silicon oil 61 acts only on the surface of the shaft 11, the braking force for braking the rotational force for rotating the shaft 11 is small. When the rotor 41 rotates together, the shearing resistance of the silicon oil 61 also acts on the surface of the rotor 41, so that the braking force for braking the rotational force for rotating the shaft 11 increases.

As described above, according to the embodiment of the present invention, the shaft 11 is independently rotated within the rotation range of the shaft 11, or the shaft 11 is rotated together with the rotor 41. When only the shaft 11 rotates, the silicon oil 61 is applied only on the surface of the shaft 11.
Is small, but the braking force for braking the rotational force for rotating the shaft 11 is small. However, when the shaft 11 and the rotor 41 rotate together, the shear resistance of the silicon oil 61 also occurs on the surface of the rotor 41. Therefore, the braking force for braking the rotational force for rotating the shaft 11 increases.

Therefore, the range in which the braking force increases is
By setting from the open state of the door D to a predetermined closed state in which the cup C can be taken out from the outlet H, the door D slowly closes from the open state of the door D to the predetermined closed state. Since the door D is closed at a normal speed, the usability is improved without the door D hitting the cup C or the hand taken out from the outlet H.

Since the first spring 31 is stretched between the shaft 11 and the cap 21, the urging force of the first spring 31 is set to an appropriate level, so that the rotating member such as the door D can be rotated. There is no need for a biasing member such as a spring that biases the spring in a predetermined direction, for example, a closing direction. Furthermore, since the second spring 51 is mounted between the shaft 11 and the rotor 41, the projection 13 can be securely fitted into the fitting recess 42, so that the braking force can be reliably changed.

In the above-described embodiment, a description has been given of an example in which the bottom side of the housing 1, that is, the cap side is set to the upper side, and the open side is set to the lower side. By arranging and setting the range where the braking force becomes large at the end of closing the lid, it is possible to prevent the lid from suddenly abutting the toilet. The first spring 31 urges the shaft 11 in the direction of screwing the housing 1 into the housing 1. However, by setting the bottom side of the housing 1 to the lower side and the open side to the upper side, the weight of the rotating body is reduced. Since the shaft 11 can be screwed into the housing 1, the first spring 31 can be omitted depending on the use condition.

Further, the example in which the rotor 41 is biased by the second spring 51 so as to contact the partition wall 2 has been described.
By setting the bottom side of the housing 1 to the lower side and the open side to the upper side, the rotor 41 abuts against the partition wall 2 by its own weight, and a large braking force acts to rotate the rotor 41.
Since the protrusion 13 is fitted into the fitting concave portion 42, the second spring 51 can be omitted depending on the use condition. In the above, an example has been described in which the silicon oil 61 is a viscous fluid, but it goes without saying that another viscous fluid may be used.

[0029]

As described above, according to the present invention, the shaft can be rotated alone within the rotation range of the shaft,
Since the shaft is rotated together with the rotor,
When only the shaft rotates, the shear resistance of the viscous fluid acts only on the surface of the shaft, so the braking force for braking the rotational force that rotates the shaft is small.However, when the shaft and the rotor rotate together, Since the shear resistance of the viscous fluid also acts on the surface, the braking force for braking the rotational force for rotating the shaft increases.

Therefore, the range in which the braking force increases is
For example, in a vending machine, by setting the open state of the door to a predetermined closed state in which the cup can be taken out from the outlet, the door slowly closes from the open state of the door to the predetermined closed state, and thereafter, Since the door D is closed at a normal speed, the door does not hit the cup or the hand taken out from the outlet and the usability is improved.

Then, the first between the shaft and the cap
Since the spring is stretched, by setting the biasing force of the first spring to an appropriate strength, a biasing member such as a spring for biasing a rotating body such as a door in a predetermined direction, for example, a closing direction, is provided. It becomes unnecessary. Furthermore, since the second spring is loaded between the shaft and the rotor, the projection can be securely fitted into the fitting recess, so that the braking force can be reliably changed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing components of a variable speed rotary damper according to an embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are cross-sectional views in which parts of the components shown in FIG. 1 are assembled to form a variable speed rotary damper, and a part thereof is cut away.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2 (b).

FIG. 4 is a partial perspective view showing a take-out port of the vending machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 housing 2 partition wall 3 female screw 4 first chamber 5 concave section 6 annular groove 7 second chamber 8 receiving concave section 9 step section 11 shaft 12 male screw 13 projection 14 locking flange 15 flange 16 locking section 21 cap 22 annular convex section 23 locking Part 31 First spring 41 Rotor 42 Fitting recess 51 Second spring 61 Silicon oil 71 O-ring

Claims (2)

(57) [Claims] 1. A partition provided with an internal thread on the inner periphery is provided in the middle of the inner periphery in the axial direction, thereby dividing the inside into a first chamber on the bottom side and a second chamber on the open end side, A bottomed cylindrical housing in which a housing recess centered on the female screw is formed on the second chamber side, and a male screw that is screwed to the female screw on the outer circumference in the axial direction;
An engagement portion that enters and exits the accommodation recess; a shaft having one end protruding from the housing; and a shaft that is inserted into the second chamber and inserted into the second chamber. A rotor provided with an engaging portion for engaging and disengaging the joint portion; a viscous fluid filled in the housing; a viscous fluid disposed at an open end of the housing, and a watertight seal between the housing and the shaft. And an O-ring for movably supporting the shaft, wherein the shaft is screwed into the housing while the engaging portion is engaged with the locking portion, The variable speed rotary damper, wherein the rotor also rotates together until the engagement of the engagement portion with the locking portion is released. 2. A partition provided with a female screw on the inner periphery is provided in the middle of the inner periphery in the axial direction, so that the inside is firstly extended in the axial direction.
A cylindrical housing which is partitioned into a chamber and a second chamber, and a housing recess centered on the female screw is formed on the second chamber side of the partition wall; Male screw,
A shaft provided with an engagement portion that enters and exits the housing recess and provided with a locking flange housed in the second chamber at one end protruding from the housing; and an open end of the first chamber being watertight. A cap to be sealed, a first spring that is stretched between the cap and the shaft, and biases the shaft in the direction of the cap; and a first spring that is housed in the second chamber with the shaft inserted. A rotor provided with a locking portion at which the engaging portion engages and disengages at an end on the side of the engaging portion; and a rotor mounted between the rotor and the locking flange, for urging the rotor toward the partition wall. A second spring, a viscous fluid filled in the housing, and disposed at an open end of the housing located at one end side of the shaft with respect to the locking flange, between the housing and the shaft. An O-ring that seals the shaft in a watertight manner and movably supports the shaft, and rotates the shaft into the housing while the engaging portion is engaged with the locking portion. When this is done, the rotor also rotates together until the engagement of the engaging portion with the locking portion is released.