JPH031634Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air damper, which is attached to the cassette inlet/output part of a cassette recorder, etc., and has a damper effect when ejecting the cassette, so that the cassette is gently taken out. Regarding the air damper.

[Prior art]

Adjustment of the damping force of this type of conventional air damper is as follows:
This is accomplished by providing a hole with a female thread in one end of the cylinder of the air damper, screwing a threaded member into the female thread, and varying the amount of tightening of the threaded member. However, in air damper cylinders that are mass-produced, the shape of the hole in which the female thread is carved at one end is not necessarily uniform; for example, it is formed in a tapered shape. There may be differences in the shape of each hole. Therefore, if a female thread is carved into the hole at one end of each of the different cylinders mentioned above, the state of the female thread carved in each cylinder will not be constant, and therefore, the threaded member will have a female thread. When screwed together, the amount of air leakage from each air damper is different and variations occur, so by changing the amount of tightening of the screw member, the amount of leakage can be adjusted, and the damping force of all air dampers can be adjusted. It was nearly impossible to make it uniformly stable.

[Problem that the invention attempts to solve]

The present invention makes it possible to finely adjust the flow rate in order to obtain a desired resistance value, in addition to the unstable flow rate adjustment using only the screw, which has the drawback of the conventional air damper having variations in the amount of air leakage. The purpose of this invention is to eliminate variations in the damping force of air dampers so that all mass-produced air dampers have a constant damping force.

[Means for solving problems]

In order to achieve the above object, the air damper according to the present invention partitions the inside of a cylinder to house a piston that is slidable with respect to the cylinder, and has a concave shape formed on the outer periphery of one end of the cylinder. In the air damper, the screw member is fitted into the screw member and the head of the screw member is inserted into the screw member. and the cylinder end surface, the flow rate restricting member is made of an elastic material and is screwed onto the female threaded portion of the cylinder, the flow rate restricting member being made of an elastic material that can vary the amount of air leakage depending on the amount of tightening of the threaded member. It is something.

〔Example〕

To explain the embodiment of the present invention shown in the drawings, in the first embodiment shown in Figs. 1 and 2, 1 is a cylinder, and a mating part (not shown) to which the cylinder is fixed at one end of the cylinder 1. A recessed portion 1a is formed to be gripped when the cylinder 1 is mounted on the cylinder 1, and a female threaded portion 1b is carved on the inner periphery of the cylinder 1 in which the recessed portion 1a is formed. Reference numeral 4 denotes a screw member that is screwed into the female threaded portion 1b, and a flow rate limiting member 2 made of an elastic material is fitted into the screw member 4 between the head 4' of the screw member 4 and the end face of the cylinder. It is installed in the condition that it is attached. 3 is a washer. Further, a piston 5 is accommodated in the cylinder 1, which partitions the inside of the cylinder 1 and freely slides with respect to the cylinder 1, and a piston rod 7 of the piston 5 is attached to a lid attached to the other end of the cylinder 1. body 8
A hook 7a is attached to the end of the hook 7a, which can be attached to a movable counterpart (not shown).

The piston 5 is formed with a tapered surface that gradually becomes smaller in diameter toward the distal end of the piston 5, and the distal end of the piston 5 and the small diameter portion of the tapered surface form an annular recess 5'. An annular packing 6 is inserted into the holder. 9 is piston 5 and cylinder 1
This is a spring that is stretched between the lid body 8 which is attached to the cap, and 8a is an air vent provided in the lid body 8.

Note that the rubber that is inserted into the screw member 4 described above,
The flow rate restricting member 2 is made of an elastic material such as synthetic resin.
It may be in the shape of a flat plate, or may be in the shape of a disc spring, a wave spring, a coil, etc.
The seal 6 inserted into the annular recess 5' of the piston 5 is shown using an O ring in the drawings of the embodiment, but it is also possible to use a U seal, a V seal, a Y seal, or the like.

The air damper configured as described above now includes a lid 8 that is attached to the piston 5 and the other end of the cylinder 1.
The spring 9 stretched between them is compressed (see Fig. 1), and the concave portion 1a provided at one end of the cylinder 1 and the hook 7a at the end of the piston rod 7 are connected to the fixed side and movable side mating parts ( (not shown)
When the movable part is released from the fixed state, the force of the spring 9 causes the first
When the piston 5 is suddenly moved in the direction of the arrow A in the figure, the gasket 6 inserted into the annular recess 5' of the piston 5, which is integrated with the piston rod 7, is moved to the large diameter part of the taper described above, and the inside of the cylinder 1 is moved. It will come into close contact with the surrounding area and be sealed. Furthermore, the piston 5 is pushed by the bias of the spring 9, and the concave portion 1a at one end of the cylinder 1 defined by the piston 5 is pushed.
The air in the side chamber A is discharged little by little through the gap between the internal screw portion 1b and the screw member 4 and the gap between the flow rate restricting member 2 made of an elastic material and the screw member 4. For this purpose, the piston 5, the piston rod 7 integrated therewith, and the hook 7a at its end
The mating member (not shown) attached to will slowly move in the direction of arrow A.

At this time, the internal threaded portion 1b and the threaded member 4
The flow rate of air discharged from the gap is adjusted by the degree of tightening of the screw member 4 to the female threaded portion 1b, but as explained in the prior art section above, this type of air damper cannot be mass-produced. In some cases, the internal thread carved on the inner periphery of one end of each cylinder 1 is not constant, so the flow rate of air discharged from the gap between the internal thread and the threaded member is adjusted by the tightening amount of the threaded member. However, in this invention, as mentioned above, it was difficult to adjust the damping force of all air dampers to be constant because the threads of each female thread part were carved differently. , between the head 4' of the screw member 4 and the cylinder end surface, the screw member 4 is
Since the flow rate limiting member 2 made of an elastic material that can vary air leakage depending on the amount of tightening is inserted into the screw member 4, when the screw member 4 is tightened, the flow rate limiting member 2 made of the elastic member will close to the screw member 4. The head 4' and the end face of the cylinder are crimped together, completely blocking air from being discharged from between the threaded member 4 and the female threaded portion 1b. Therefore, by adjusting the tightening amount of the screw member 4 from the state where this discharge is completely prevented, that is, the state where the discharge amount is zero, the crimped state of the flow rate restricting member 2 made of an elastic material can be adjusted. This makes it possible to easily keep the amount of air discharged constant.

Therefore, each cylinder 1 manufactured
Even if there are variations in the carved state of the female threads, the amount of air leakage can be made variable by the screw member 4. The flow rate can be easily controlled by the flow rate restricting member 2 made of an elastic material. It is something.

Next, when an attempt is made to move the hook 7a at the end of the piston rod 7 by applying force in the direction of arrow RO in FIG. 2 against the spring 9, the piston 5 also does not move in the same direction, and the The packing 6, which was located on the large diameter side of the taper of the annular recess 5' and was sealing the inner periphery of the cylinder 1, moved to the small diameter side of the taper and entered into the annular recess 5'. As a result, a gap is created between the piston 5 and the cylinder 1, and air flows into the chamber A in the cylinder 1, so that the state shown in FIG. 1 can be achieved without any air pressure resistance acting.

As described above, according to this embodiment, it is possible to provide a damper effect due to air resistance only in one direction (direction A in this embodiment), and the adjustment is not possible with the conventional screwdriver, which is incomplete due to uneven air leakage. In addition to the flow rate adjustment by a chisel, it is possible to finely adjust the flow rate to obtain a desired resistance value by adjusting the amount of tightening of the screw member 4 described above, and furthermore, it is possible to reduce variations in the flow rate.

Next, the second embodiment shown in FIGS. 3 and 4 will be explained. Since the basic configuration of the second embodiment is the same as that of the first embodiment, FIGS.
Components in the figures that are the same as those in the first embodiment are designated by the same reference numerals, and only the differences will be explained.

7b is a rack engraved on one surface of the piston rod 7, and 10 is a pinion that meshes with the rack 7b.A shaft (not shown) of a rotating mating part is connected to the pinion 10. 1
Reference numeral 1 denotes a rod presser, which is located on the opposite side of the rack 7b carved on one side of the piston rod 7, and presses the piston rod 7 by sandwiching it with the pinion 10.

In this second embodiment, when the pinion 10 rotates in the direction A' in FIG.
When the piston 5 moves in the direction of arrow A in FIG. 3 and the pinion 10 rotates in the direction of arrow B in FIG. 4, the piston rod 7 and piston 5 move in the direction of arrow B. This embodiment has the same functions and effects as the first embodiment except that the motion is converted into linear motion.

The above makes one rotation (in the case of this example, in the A′ direction)
A damper effect (slow rotation) due to air pressure resistance can be provided, and the adjustment can be finely adjusted by the presence of the flow rate restricting member 2 made of an elastic material, and the variation thereof can be reduced.

[Effect of idea]

The air damper according to the present invention has a threaded member formed on the inner periphery of one end of the cylinder that is threaded into a female threaded part, and a threaded part between the head of the threaded member and the end surface of the cylinder.
Since the flow rate limiting member made of an elastic material is inserted so that the leakage of air can be varied depending on the amount of tightening of the screw member, the flow rate limiting member made of the elastic material is connected to the head of the screw member depending on the amount of tightening of the screw member. It is crimped between the cylinder end faces, and between the threaded member and the female thread.
This will prevent more air from leaking,
When the tightening amount is maximized, the leakage is completely prevented, but it is possible to easily determine the amount of leakage allowed for each cylinder by loosening the screw member based on this state of zero leakage amount. In addition, there is no need to form a small-diameter communicating hole in the piston member and perform a throttling action using the communicating hole as in the conventional case, and the adjustment is extremely good because the exhaust is directly exhausted. This system provides a damper effect (slow movement) due to the air resistance of the damper depending on the flow rate of the air that leaks out. The idea is to make it possible to finely adjust the flow rate to obtain a desired resistance value by using the above-mentioned flow rate limiting member, and it is also possible to easily adjust the force of a large number of mass-produced air dampers to a constant level. There is an effect that can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the air damper of the present invention, and FIGS. 1 and 2 are cross-sectional views showing the state before and after the operation of the first embodiment, and FIGS. 3 and 4 show the state of the second embodiment. FIG. 3 is a cross-sectional view showing the state before and after operation of the example, and members having the same function in each example are given the same reference numerals. DESCRIPTION OF SYMBOLS 1...Cylinder, 1a...Concave part, 1b...Female thread part, 2...Flow rate limiting member, 4...Threaded member,
5... Piston, 6... Packing, 7... Piston rod, 7a... Hook, 7b... Rack, 9
...Spring, 10...Pinion.

Claims (1)

[Scope of utility model registration request] The inside of the cylinder is partitioned to accommodate a piston that is slidable with respect to the cylinder, and the piston is engaged with a female thread formed on the inner periphery of a concave portion formed on the outer periphery of one end of the cylinder. In an air damper equipped with a screw member that adjusts the flow rate of air, the screw member is inserted into the screw member, and air is pumped between the head of the screw member and the end face of the cylinder depending on the tightening amount of the screw member. An air damper characterized in that the air damper is configured by being screwed into the female threaded portion of the cylinder via a flow rate limiting member made of an elastic material that can vary the amount of leakage.