JPH01307531A - Air damper - Google Patents

Abstract

PURPOSE:To make all operation of a subject to be rotated stabilized and smooth in an air damper used for such as a cover of a home electric appliance by adding a function for decreasing the reaction of a coil spring in the vicinity of termination of movement of the subject. CONSTITUTION:In a cylinder main body 1, a piston 2 capable of sliding in an axial direction is disposed. Closing operation of a cover of a furniture or home electric appliance is transmitted to the piston 2 through a piston rod 3. At this time, air is compressed in a chamber A of the body 1 and air spring action is made. At the same time, buffering action is made by a spring 5. In a point which is in the vicinity of cover closing final end, a valve body 19c is spaced from the outer face of end wall of cylinder main body, thereby an air vent 6 is released to discharge the compressed air in the chamber A speedily. It is thus possible to close a cover smoothly and completely.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air damper used to reduce the impact when a lid of furniture or a household appliance is closed.

<Prior art> Conventionally, air dampers have been used to smoothly rotate objects such as furniture or the lid of a home appliance, which receive a force in the direction of gravity when the block is closed and whose rotational moment gradually increases toward the end of the block. A damper for moving is known.

Conventionally, this device includes a cylinder body, a piston disposed slidably in the axial direction within the cylinder body, a piston rod connected to the piston, and a piston rod provided at one end of the cylinder body. an air passageway through which the rod can protrude outward; a return coil spring interposed between the cylinder body and the outer end of the piston rod;
For example, the base of the cylinder body is connected and fixed to an immovable part, and the outer end of the piston rod is connected to a lid of furniture or household appliances, a lid of a Western-style toilet, etc.

Then, the closing action of the lid is transmitted to the piston via the piston rod, and at the same time as the piston slides inside the cylinder body and compresses the air in the sealed side chamber of the cylinder body, the spring is activated. A compressing action is performed, and a composite buffering action is performed by the air and the spring.

This air damper can obtain an air spring force that corresponds to the increase in the load of the rotating object.As the spring compresses, the elastic force of the spring gradually increases, so that the lid of the piano becomes clogged. It is possible to absorb the load, that is, the rotational moment, which gradually increases toward the end, and has the effect of effectively absorbing the impact when the lid is completely closed.

(Problem to be solved by the invention) However, in such a conventional air damper, by making the repulsive force of the coil spring act simultaneously with the repulsive force of the air spring, it is possible to cope with and absorb the rotational moment that gradually increases on the lid. However, since the repulsive force of the spring becomes quite large at the closed end of the lid, the lid does not close smoothly, such as when the lid bounces back at the closed end or becomes unbalanced in a half-open state. There was a drawback.

Therefore, in view of the above-mentioned conventional circumstances, the present invention provides an air damper with a coil spring that can obtain a spring force corresponding to the increase in the load of a rotating object. It is an object of the present invention to provide an air damper which stabilizes and smoothes a series of movements of a rotating object by adding a function of reducing repulsion.

<Means for Solving the Problems> For this reason, the present invention provides a cylinder body, a piston mounted slidably in the axial direction within the cylinder body,
A piston rod connected to the piston, an air passage opening formed at one end of the cylinder body so that the piston rod projects outwardly, and a piston rod arranged to surround the cylinder body and the piston rod protrusion. A compression spring is provided, one end of which abuts and is locked to a locking portion on the outer periphery of the cylinder body, and the other end of which is locked to a locking portion at the outer end of the piston rod; An air vent provided in the end wall, a valve shaft that passes through the end wall and is supported so as to be freely slidable, and a valve shaft that is fixed to the inner end of the cylinder body of the valve shaft and that is attached to the tip end surface of the piston or the piston rod. A locking piece whose inner end can come into contact with the valve body, a valve body fixed to the outer end of the cylinder body on the valve shaft, and a locking piece interposed between the end wall of the cylinder body and the locking piece. An air damper comprising: an elastic member that elastically urges the locking piece in a direction in which the valve body tightly closes and closes the air vent in a normal state; and a ventilation adjustment mechanism.

<Function> In this configuration, by causing the repulsive force of the spring to act simultaneously with the repulsive force of the air, it is possible to cope with the rotational moment that gradually increases and is applied to the lid. Then, at the end point of the operation of the rotating object, the tip end surface of the piston comes into contact with the ventilation adjustment mechanism to operate it. As a result, the valve body on the outside of the cylinder body separates from the cylinder holding member, opening the ventilation hole, and the compressed air in the chamber of the cylinder body is exhausted to the outside from the air circulation hole at once, and the air spring force is extremely reduced. until the lid is fully seated.

Therefore, the rotating object does not bounce back at the end of the operation, the lid does not stop half-open, and the operation is performed smoothly, and the lid can be completely closed without causing impact noise or damage when the lid is closed.

(Example> Next, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a cylinder body, 2 is a piston disposed slidably in the axial direction within the cylinder body 1, 3 is a piston rod connected to the piston 2, and 4 is the cylinder body 1. The air passageway is provided by opening one end, and the piston rod 3 is disposed so as to be able to protrude and retract outward.

5 is arranged so as to surround the protrusion of the cylinder body 1 and the piston rod 3, one end of which is locked to a locking portion (to be described later) on the outer periphery of the cylinder body 1, and the other end of the cylinder is connected to the piston. Compression springs are respectively locked to locking portions at the outer ends of the rods 3, and reference numeral 6 is an air vent provided in the end wall of the cylinder body 1.

A male threaded portion la is formed on the outer peripheral surface of the cylinder body 1, and a cylinder holding member 7 in the shape of a cylinder with a bottom is screwed onto the outer peripheral portion of the tip end of the cylinder body 1. This holding member 7
An air hole 8 is formed penetrating through the end wall, and a mounting member 7A is integrally formed and protrudes from the end wall. A pin shaft 16a provided in the stationary portion 16 (see FIG. 2) is rotatably inserted into the hole 9.

Further, two nuts 10 and 11, which constitute a locking portion of the spring 5, are screwed onto the outer peripheral portion of the cylinder body 1.

An annular groove 2a is formed on the circumferential surface of the piston 2, into which a seal member 12 is fitted.

The piston 2 also has an orifice 1 for ventilation to enable the piston to return with low resistance as described later.
3 is formed.

Further, the outer periphery of the tip of the piston rod 3 protruding from the tip surface of the piston 2 acts to close the orifice 13 when the piston 2 acts lAl1 fJi, that is, when the bushing operates, and conversely, when the piston 2 returns to its original position, the orifice 13 is closed. A disk-shaped valve seat 14 made of a somewhat flexible rubber material is mounted so as to open the orifice 13.

The external threaded portion 3a of the outer end of the piston rod 3 is screwed into a connecting member 18, and the hole 17 of the connecting member is fitted with a lid 15 of furniture or household electrical appliances as an object to be rotated (see FIG. 2). ) is inserted through the pin shaft 15a for free rotation.

The outer peripheral portion of the holding member 18 has a locking portion 18a formed in an annular stepped portion, and the end portion of the spring 5 is locked therein.

On the other hand, a valve shaft 19a is slidably supported through a through hole 1b formed in an end wall of the cylinder body 1, and a locking piece 19b is formed of a pair of plates fixed to both ends of the valve shaft 19a. .

and a locking piece interposed between the valve body 19c, the locking piece 19b and the end wall of the cylinder body 1, and normally directed in the direction in which the valve body 19c tightly contacts and closes the air vent 6. A ventilation adjustment machine tl consisting of a compression spring 20 for elastically biasing the airflow regulator 19b! 21 are provided.

A rubber sheet 22 is attached to the contact surface between the outer valve body 19c of the cylinder body 1 and the cylinder body l.

In such a configuration, If15 of furniture or household appliances
The lid closing operation is transmitted to the piston 2 via the piston rod 3, and the piston 2 slides within the cylinder body 1. At this time, the air is compressed in the chamber A of the cylinder body 1, thereby producing an air spring action. At this time, the orifice 13 of the piston 2 is closed by the valve seat 14 as described above.

At the same time as this operation, the spring 5 is compressed, and a buffering effect by the spring 5 is also performed at the same time.

Then, at the end of the operation of the furniture or home appliance 115, that is, near the end of closing the lid, the tip surface of the piston 2 comes into contact with the upper surface of the locking piece 19b, and the elastic force of the spring 20 causes the valve body 19c to Push it down against the pressure. This results in
Since the valve body 19c is separated from the outer surface of the end wall of the cylinder body 1, the air vent 6 is opened and the compressed air in the chamber A is quickly discharged to the outside.

As a result of reducing the air spring force to a predetermined level near the end of the stroke of the piston 2, the lid 15 of the furniture or home appliance does not bounce back at the closing end, and the closing operation of the lid 115 can be performed smoothly. be exposed.

Furthermore, when opening the M2S of furniture or home appliances, the opening operation of the lid 15 is transmitted to the piston 2 via the piston rod 3, the piston 2 moves in the return direction within the cylinder body 1, and the spring 5 is activated. Return to the initial setting direction. Further, the valve body 19c returns to its original position due to the elastic force of the spring 20, and the air vent 6 is closed again.

At this time, the orifice 13 of the piston 2 is
Since the atmosphere flows into the valve seat 14, the valve seat 14 is pressed open as described above.

Therefore, a large amount of air flows into the chamber A through the orifice 13, and the piston 2 returns with little resistance, so that the door can be opened easily.

In addition, in this example, one of the furniture or household electrical appliances
In order to adjust the air spring force with respect to the rotational moment acting on the piston 15, for example, it can be done by applying grease to the circumferential surface of the piston 2 and changing the viscous resistance of the grease between it and the inner circumferential surface of the cylinder body 1. can. Also,
Nuts 10 and 11 screwed into the outer peripheral surface of the cylinder body 1
The damping force can also be adjusted by adjusting the fitting position of the spring 50 and changing the elastic force of the spring 50. In this case, by using two nuts to and tt, both nuts 10 and 11 can be fixed without loosening.

Furthermore, in this embodiment, the stroke length can be adjusted depending on the mounting location of the air damper.

In this case, the connecting member 1 at the outer end of the piston rod 3
This is done by adjusting the fitting position of 8 or the collapsing position of the holding member 7 on the opposite side in the cylinder axial direction.

In this case, the connection element 18 or the holding element 7 is securely fixed by tightening the respective locking nuts 23, 24.

<Effects of the Invention> As explained above, according to the air damper of the present invention, in an air damper with a compression spring that can obtain a buffering force corresponding to an increase in the load of a rotating object, Since the repulsive force of the spring can be adjusted, the lid can be closed smoothly and completely, the movement of the rotating object can be stabilized, and the damping effect can be obtained without lacking. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an air damper according to the present invention, and FIG. 2 is a schematic explanatory view showing an example of how the air damper of the embodiment is mounted. l...Cylinder body 2...Piston 3...Piston rond 5...Spring 6...Air vent to, tt... ... Nut 18a ... Step part 19b ... Locking piece 19c ... Valve body 20 ... Spring 21 ... Ventilation adjustment mechanism

Claims (1)

[Scope of Claims] A cylinder body, a piston mounted slidably in the axial direction within the cylinder body, a piston rod connected to the piston, and an opening formed at one end of the cylinder body to connect the piston. A rod is disposed to surround the outwardly projecting atmospheric communication port, the cylinder body and the protruding portion of the piston rod, and one end portion is abutted and locked to a locking portion on the outer periphery of the cylinder body. In addition, the other end is supported by a compression spring that is locked by a locking part at the outer end of the piston rod, an air vent provided in an end wall of the cylinder body, and a freely slidable support that passes through the end wall. a locking piece fixed to the inner end of the cylinder body of the valve stem and capable of abutting the piston tip surface or the inner end of the piston rod; and an outer end of the cylinder body of the valve stem. The locking piece is interposed between the valve body fixed to the cylinder body, the end wall of the cylinder body, and the locking piece, and the locking piece is inserted in the direction in which the valve body tightly closes and closes the air vent in a normal state. An air damper comprising: an elastic member that provides resilient force; and a ventilation adjustment mechanism.