JPH06317738A - Buffer device - Google Patents

Abstract

PURPOSE:To obtain a sufficient buffer effect without making structure large. CONSTITUTION:Gears 1b and 2b(2b-1 and 2b-2) are provided on an operation shaft 1a and a moving shaft 2a and the shaft 3a of a buffer device being indepedent of two shafts 1a and 2a is provided. Besides, an inner cylinder 4 and an outer cylinder 5 provided with gears 4b and 5b are provided. Since the cylinders 4 and 5 are rotated in a reverse direction by respectively engaging the cylinders 4 and 5 with the shafts 1a and 2a through the gears 4b and 5b, the relative sliding speed and the relative sliding quantity of the cylinders 4 and 5 can be increased to twice. By using buffer solution for the sliding surface of the cylinders 4 and 5, buffer force is changed according to a moving speed. By rotating them in the reverse direction, the large buffer force is obtained and the device can be miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing device for absorbing shock of a shock absorbing object.

[0002]

2. Description of the Related Art Conventionally, as this type of shock absorbing device, there is known a shock absorbing device which alleviates the shock caused by the mounting / dismounting operation of an extender mounted on a lens device of a television camera or the like.
3-15867, Japanese Patent Publication No. 62-51454).

FIG. 8 and FIG. 9 are a sectional view showing an example of a conventional shock absorber and a sectional view including the optical axis orthogonal to the optical axis. The operation lever (31) is fixed to one end of the extender moving frame (32) by a nut (43). The extender moving frame (32) is rotatably attached to the extender lens chamber (40) via a bearing (45). The extender moving frame (32) is provided coaxially with the rotary operation shaft (31a) of the operating lever (31), and the extender moving frame (32) includes an extender lens chamber (37).
b) is attached with screws (46). The extender lens chamber (37b) holds an extender (37) composed of a plurality of lenses.

The toggle spring (38) is attached to the extender moving frame (32) by a toggle spring fixing pin (48), and when the lens is attached or detached by urging the extender moving frame (32). The frame (32) is stopped at each predetermined position. This toggle spring (38) must have a considerably large amount of force in order to prevent the extender moving frame (32) from moving from a predetermined position even when an external force such as shock or vibration is applied. I won't.

The limiter (39) is for limiting the movement of the extender moving frame (32) when the extender (37) is inserted on the optical axis (37a), and the limiter lens chamber (40). ) Is provided on the side wall (FIG. 8). The limiting section (39) is provided with a screw adjusting mechanism to correct the positional deviation from the optical axis (37a). The limiter (39) must be precisely aligned with the optical axis (37a) when the extender (37) is inserted on the optical axis (37a), so it is difficult to deform metal or the like. Is used. The limiting section (39a) is a section that limits the movement of the extender moving frame (32) when it is retracted.

As described above, since the force of the toggle spring (38) is large and the limiting portion (39) is made of metal,
When the extender (37) is attached or detached, the extender (37) is impacted and a loud noise is generated. To prevent this, a shock absorber is provided.
The shock absorber includes a shaft pin (33), a rotating member (34), and a pin (3
5), spring (36), washers (41), (42), screws (47)
Etc. In this shock absorber, a spring (36) is inserted into a shaft pin (33) having an independent rotating shaft (33a), and then a rotating member (34) sandwiched between washers (41) and (42) is screwed. It is fixed by (47). In this way, the structure in which the rotating member (34) is suppressed by the spring (36) to generate a cushioning force by the frictional force. A pin (35) is embedded in the rotating member (34), and the pin (35) is engaged with a part of the extender moving frame (32).
Operates according to the rotation of the extender moving frame (32).

Since this shock absorbing device utilizes the frictional force as the buffering force, the frictional force is always substantially constant and depends on the friction coefficient. Therefore, if a buffering force is applied over the entire area, the extender moving frame (32) will stop near the neutral position of the toggle spring (38). For this reason, in order not to stop the extender moving frame (32) and to prevent the buffering force from acting at the dead center position of the toggle spring (38), the pin (3
The notch (32b) was provided in the engaging portion with 5) to limit the operating range.

[0008]

However, in the above-described conventional shock absorber, since one rotating member (34) rotates around the shaft of the shock absorber to generate a shock absorbing force, a small amount of movement is required. Therefore, a relatively large buffer force must be generated, and its adjustment is difficult.

On the other hand, as a shock absorber, there is a shock absorber using a buffer solution such as oil. However, since the shock absorbing amount changes depending on the sliding area and the sliding speed, a large shock absorbing force is exerted when the sliding speed is low. There is a problem in that the structure itself becomes large as a result.

Therefore, an object of the present invention is to provide a shock absorber which can obtain a sufficient shock absorbing effect without increasing the size of the structure.

[0011]

In order to solve the above-mentioned problems, a shock absorber according to the present invention comprises an input means for inputting an operating force, and an output means driven by the input means and connected to an object to be buffered. And a shock absorbing means for generating a shock absorbing force by moving the first and second members respectively engaged with the input means and the output means in opposite directions. In this case, the buffering means may have a variable buffering force. Further, the buffer means may be characterized in that a buffer solution is filled between the first and second members.

[0012]

In the present invention, since the first and second members are moved in opposite directions, the buffering force is increased. Further, since the contact areas of the first and second members can be changed, the cushioning force can be changed. further,
By filling the buffer solution between the first and second members,
Since the buffering force changes according to the moving speed of the object to be buffered, it is possible to apply the buffering force over the entire moving range. As a result, for example, in the vicinity of the dead point position of the toggle spring, the buffering force is also small, so that the escender movement frame does not stop. Furthermore, after being fixed at a predetermined position, it acts as a stopper in the event of external impact or vibration.

[0013]

Embodiments will be described in more detail below with reference to the drawings and the like. 1 is a sectional view orthogonal to an optical axis showing a first embodiment of a shock absorber according to the present invention, FIG. 2 is a sectional view including the optical axis showing the first embodiment, and FIG. It is the perspective view which extracted the part.

1 and 2, (6) is a toggle spring, (6a) is a toggle spring fixing pin, (7) is an extender, (7a) is an optical axis, (7b) is an extender lens chamber, (8) and (8). 8a) is a limiting part, (9) is an adjustment washer, (10) is an extender lens barrel, (11) is a bearing, and (12) and (13) are screws. A duplicate description will be omitted, and the shock absorber will be mainly described.

In the first embodiment, the rotary operating shaft (1a) of the operating lever (1), the rotary moving shaft (2a) of the extender moving frame (2), and the rotary shaft (3a) of the shock absorber are independent shafts. And has an operating lever (1) as shown in FIG.
And the moving frame (2) are provided with gears (1b, 2b-
1) is engaged. This shock absorber has an inner cylinder (4) and an outer cylinder (5) each provided with gears (4b, 5b), and the inner cylinder (4) and the outer cylinder (5) are respectively operating lever gears (1b). And the moving frame gear (2b-2) to the gear (4b,
5b).

In this shock absorber, a buffer solution such as oil is filled between the rotary shaft pin (3) and the inner cylinder (4) and between the inner cylinder (4) and the outer cylinder (5). The extender moving frame (2)
Extender (7) biased by toggle spring (6)
When it is put on and taken off, it is stopped at each predetermined position. When the extender (7) is inserted on the optical axis (7a), the limiter (8) is provided with an adjustment washer (9) in order to correct the positional deviation from the optical axis (7a). There is.

Next, the operation of the shock absorber configured as described above will be described by taking the case of inserting the extender (7) as an example. As shown in FIG. 1, the operating lever (1) is operated in the direction of arrow A to rotate the extender moving frame (2) in the direction of arrow B to rotate the toggle spring (6) to the neutral point and pass through the neutral point. Then, the extender (7) is automatically inserted by the force of the toggle spring (6). At this time, the inner cylinder (4) engages with the operating shaft (1), and the outer cylinder (5)
Engages with the extender moving frame (2), they rotate in opposite directions (arrows C and D in FIG. 3). As a result, the relative sliding speed of the inner cylinder (4) and the outer cylinder (5) can be doubled.

Further, since a buffer solution is used for the sliding surfaces of the inner cylinder (4) and the outer cylinder (5), the buffer force changes according to the moving speed of the extender moving frame (2), and By rotating in the opposite direction (directions of arrows C and D in FIG. 3), a large cushioning force can be obtained and the cushioning device can be downsized.

The toggle spring (6) has a
The turning force on the extender moving frame (2) is small,
Correspondingly, the buffering force also becomes smaller, so that it will not stop. Further, when a force such as shock or vibration is applied from the outside, the shock absorber serves as a stopper.

FIG. 4 is a perspective view showing a second embodiment of the shock absorber according to the present invention. In each of the embodiments described below, a portion having the same function as that of the first embodiment is
The same reference numerals are given and duplicate explanations are omitted. In the second embodiment, the outer cylinder (5) has a gear (5b-1) with a long tooth width.
The outer cylinder (5) is moved in the axial direction (direction of arrow E) to change the contact area with the inner cylinder (4) so that the cushioning force can be varied. .

FIG. 5 is a perspective view showing a third embodiment of the shock absorber according to the present invention. In the third embodiment, a cushioning member (16) such as a rubber tube is inserted between the inner cylinder (4) and the outer cylinder (5) instead of the buffer solution. For this reason, it is suitable for applications where leakage of the buffer solution is a concern.

FIG. 6 is a perspective view showing a fourth embodiment of the shock absorber according to the present invention. In the fourth embodiment, instead of the inner cylinder (4) and the outer cylinder (5), buffer plates (14), (1
5) is used, and a buffer solution is inserted between them.
Since the buffer plates (14) and (15) are used, the contact area can be increased.

FIG. 7 is a perspective view showing a fifth embodiment of the shock absorber according to the present invention. In the fifth embodiment, the buffer plates (14-1) and (15-1) are attached so as to be rotatable around the shaft 14a, and the structure can be downsized.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, which are also included in the present invention. For example, the cushioning device of each of the above-described embodiments has been described as an example provided in the extender of the lens device, but any structure having an input unit and an output unit can be applied.

[0025]

As described in detail above, according to the present invention, since the structure is such that the first and second members are moved in opposite directions, the buffering force is increased and the size can be reduced. . Further, since the cushioning force can be changed by changing the contact areas of the first and second members, the adjustment can be easily performed.

Further, if a buffer solution is filled between the first and second members so that the buffer force changes according to the moving speed of the object to be buffered, the buffer force is given over the entire moving range. It becomes possible. That is, since the resistance of the buffer solution is used, the buffering force changes according to the change of the operating speed and the sliding speed can be increased, so that the buffering force is increased, and the effect of reducing the size of the shock absorber is achieved. can get.

[Brief description of drawings]

FIG. 1 is a cross-sectional view orthogonal to an optical axis showing a first embodiment of a shock absorber according to the present invention.

FIG. 2 is a cross-sectional view including a light axis showing the shock absorber of the first embodiment.

FIG. 3 is a perspective view showing an outline of the structure of the shock absorber of the first embodiment.

FIG. 4 is a perspective view showing the outline of the structure of a shock absorber according to a second embodiment.

FIG. 5 is a perspective view showing the outline of the structure of a shock absorber according to a third embodiment.

FIG. 6 is a perspective view showing the outline of the structure of a shock absorber according to a fourth embodiment.

FIG. 7 is a perspective view showing the outline of the structure of a shock absorber according to a fifth embodiment.

FIG. 8 is a view showing a cross section orthogonal to the optical axis of a conventional shock absorber.

FIG. 9 is a view showing a cross section including an optical axis of a conventional shock absorber.

[Explanation of symbols]

 1: Operating lever 1a: Rotating operating shaft 1b: Operating lever gear 2: Extender moving frame 2a: Rotating moving shaft 2b: Moving frame gear 3: Rotating shaft pin 3a: Rotating shaft 4: Inner cylinder 4b: Inner cylinder gear 5: Outer cylinder 5b: Outer cylinder gear 6: Toggle spring 6a: Toggle spring fixing pin 7: Extender 7a: Optical axis 7b: Extender lens chamber 8: Limiting part 8a: Limiting part 9: Adjusting washer 10: Extender barrel 11: Bearing 12: Screw 13: Screw 31: Operation lever 31a: Rotation operation shaft 32: Extender moving frame 32b: Notch 33: Buffer mechanism shaft pin 33a: Buffer mechanism shaft 34: Rotating member 35: Pin 36: Spring 37: Extender 37a: Optical axis 37b: Extender chamber 38: Toggle spring 39: Limiting portion 39a: Limiting portion 40: Extender lens chamber 41: Wa 42: Washer 43: Nut 44: Extender fixing member 45: Bearing 46: Screw 47: Screw 48: Toggle spring fixing pin

Claims (3)

[Claims] 1. An input unit for inputting an operating force, an output unit that is driven by the input unit and is connected to an object to be buffered, and first and second engaging units that respectively engage the input unit and the output unit.
A shock absorbing device, comprising: shock absorbing means for generating a shock absorbing force by moving the second member in opposite directions. 2. The shock absorbing device according to claim 1, wherein the shock absorbing means has a variable shock absorbing force. 3. The buffer device according to claim 1, wherein the buffer means is filled with a buffer solution between the first and second members.