JP4566126B2 - Locking mechanism for rotating body and electric device support using the locking mechanism - Google Patents

Description

  The present invention relates to a lock mechanism for a rotating body and a support device for an electric device using the lock mechanism, and more specifically to a support device for a monitoring camera that can finely adjust a rotation angle according to a point to be photographed.

As a mechanism for locking, that is, softly locking the rotating body in accordance with the rotational position of the rotating body, there is one shown in FIG. 7 (see, for example, Patent Document 1). This is because the fixed body (1) is opposed to the plate-shaped rotating body (2), the concave portion (25) is fitted on the rotating body (2), and the spherical surface is fitted into the concave portion (25) on the lower surface of the fixed body (1). The protrusion (10) is provided. The protrusion (10) is biased by the spring (15) toward the recess (25), and a plurality of the recess (25) and the protrusion (10) are provided according to the rotational position where the rotating body (2) should be locked. ing. When the rotating body (2) rotates and the protrusion (10) fits into the recess (25), the rotating body (2) is locked at a desired rotational position.
In addition to this, at a predetermined rotational position, a structure that locks the rotating body (2) and the fixed body (1) with a screw, a wave-like washer is applied to the rotating body (2) or the fixed body (1), A structure in which the rotating body (2) and the fixed body (1) are locked by the spring force of the washer is also well known.

JP-A-9-220193

Some rotating bodies (2) want to be locked for every minute rotation angle. In the conventional locking mechanism shown in FIG. 7, in order to lock the rotating body (2) for every minute rotation angle, it is necessary to provide a recess (25) and a protrusion (10) for each minute rotation angle. The strength of the rotating body (2) or the fixed body (1) becomes weak. Also, if a large number of protrusions (10) are provided, it takes time to manufacture the fixed body (1), which leads to an increase in cost.
Further, in the structure in which the rotating body (2) and the fixed body (1) are locked by screws, it takes time to finely adjust the rotation angle. In the structure in which the rotating body (2) and the fixed body (1) are locked by the spring force of the washer, the rotating position of the rotating body (2) is easily shifted when subjected to vibration or impact.
An object of the present invention is to reliably lock a rotating body for each minute angle with a simple configuration.

The fixed body (1) and the rotating body (2) are made to face each other, the rotating body (2) is provided with a plurality of holes (20) or recesses, and the fixed body (1) is directed toward the holes (20) or the recesses. Provide a plurality of elastically biased protrusions (10),
On the rotating body (2), the hole (20) or the recess is provided for each main angle θ1 which is 360 / n degrees (n is an integer),
On the fixed body (1), the protrusions (10) are formed at every sub-angle θ2 that is an integer multiple of (360 + 360 / n) / n degrees less than n,
In the state where one protrusion (10) is fitted in one hole (20) or recess, the protrusion (10) is adjacent to the rotation side of the rotating body (2), and the protrusion (10) is next The hole (20) or recess to be fitted into the rotor is separated to the rotating side of the rotating body (2) by the difference between the sub-angle θ2 and the angular position of the nearest hole (20) of the protrusion (10). ing.

If n = 30, the main angle θ1 is 12 degrees, and the sub-angle θ2 is an integer multiple of less than 30 of 12.4 degrees. Here, for convenience of explanation, the sub-angle θ2 is set to 62 degrees, which is five times 12.4 degrees. Assuming that the position where one protrusion (10) is fitted in one hole (20) or recess is 0 degree as a reference, the protrusion (10) is a protrusion adjacent to the rotating side of the rotating body (2). The part (10) is 62 degrees away from one protrusion (10). The angular position of the nearest hole (20) of the adjacent protrusion (10) is 60 degrees which is a multiple of the main angle θ1. That is, in a state where one protrusion (10) is fitted in one hole (20) or recess, the protrusion (10) is the protrusion (10) adjacent to the rotating side of the rotating body (2). The nearest hole (20) is separated by 2 degrees on the rotating side of the rotating body (2). The difference of 2 degrees is an angle for finely adjusting the rotating body (2). If the rotating body (2) is rotated by 2 degrees, the next protrusion (10) is fitted into the hole (20) or the recess.
That is, with a simple configuration that shifts an integral multiple of the main angle θ1 that is the angular interval of the holes (20) of the rotating body (2) and θ2 that is the angular interval of the protrusions (10) of the fixed body (1), The rotating body (2) can be reliably locked at every minute angle. Thereby, a rotary body (2) can be positioned easily and reliably for every minute angle.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
Fig.1 (a) is a front view of the support tool of the electric equipment using the lock mechanism of this example, and specifically indicates the support tool (4) of the surveillance camera. FIG. 1 (b) is a left side view of FIG. 1 (a). The support (4) is suspended from the ceiling (44) and supports the surveillance camera (5). The mounting piece (40) is attached to the ceiling (44), and the mounting piece (40) is horizontal. Bracket (41) supported so as to be rotatable in the direction (A direction in FIG. 1 (a)), and holding provided so as to be rotatable in the vertical direction (B direction in FIG. 1 (a)). A piece (42) and a support piece (43) provided at the tip of the holding piece (42) so as to be vertically rotatable (direction C in FIG. 1 (b)) are provided. The bracket (41), the holding piece (42), and the support piece (43) are manually rotated by the user according to the place to be photographed. As will be described later, the monitoring camera (5) is desired. When locked in the rotational position, the user feels a click on the hand.

The holding piece (42) and the supporting piece (43) rotate around horizontal axes L1 and L2 orthogonal to each other, and the monitoring camera (5) is attached to the supporting piece (43). With the bracket (41), the surveillance camera (5) can be rotated in the horizontal direction, and a so-called pan function can be exhibited. When the holding piece (42) is rotated up and down in the B direction, the supporting piece (43) is also rotated in the same direction. Further, only the support piece (43) can be rotated up and down in the C direction. Thereby, a so-called tilt function which is a rotation in the vertical direction can be exhibited. That is, the support tool (4) can rotate the monitoring camera (5) in three directions.
Between the mounting piece (40) and the bracket (41), between the bracket (41) and the holding piece (42), and between the holding piece (42) and the supporting piece (43), a rotation lock unit that locks at every minute angle ( 3) is provided, and in this example, this rotation lock unit (3) is characterized.

  FIG. 2 is a schematic diagram of the inside of the monitoring camera (5). As is well known, the surveillance camera (5) includes a CCD (50) for receiving an image of the subject (52) and a lens (51) for focusing the image of the subject (52) on the CCD (50). Yes. The angle range φ of the subject (52) that can be received by the CCD (50) is called an angle of view, and the applicant assumes that the angle of view of the surveillance camera (5) is 20 degrees. Accordingly, the idea was to lock the surveillance camera (5) at a sufficiently small angle with respect to the angle of view, specifically every 2 degrees. Of course, the angle of view of 20 degrees is an example, and the angle of view is not limited to 20 degrees. Further, the pitch of the minute angle to be locked is not limited to 2 degrees, but is determined according to the angle of view.

FIG. 3 (a) is an exploded view of the rotation lock unit (3). The rotation lock unit (3) includes a rotating body (2) formed by punching a metal plate and a fixed body (1) formed from the metal plate and facing the rotating body (2). The rotating body (2) is connected to the rotating side. For example, the rotating body (2) is connected to the bracket (41) between the mounting piece (40) and the bracket (41). The fixed body (1) is connected to the mounting piece (40).
On the rotating body (2), n round holes (20) are formed at equal intervals along the circumferential direction. In FIG. 3 (a), the number n of holes (20) is 30 and the angular interval of the holes (20) is 12 degrees. An angular interval (angular pitch) in which the holes (20) are opened is a main angle θ1.
The value of n is not limited to 30, but may be an integer. However, unless n is a divisor of 360, 360 / n does not become an integer and a hole (20) is formed every 360 / n degrees. It is thought that forming becomes complicated. If n is a large number, it is difficult to actually open n holes (20) on the rotating body (2) because of the strength of the rotating body (2), and n opens the hole (20). It is determined based on the number actually possible.

FIG. 3 (b) is a right side view of the fixed body (1). On the fixed body (1), a plurality of protrusions (10) to be fitted into the holes (20) are formed along the circumferential direction. Since the fixed body (1) is a metal plate, when the protrusion (10) is in contact with the peripheral edge of the hole (20), the protrusion (10) is elastically attached to the fixed body (1). When the protrusion (10) is in contact with the hole (20), it is fitted into the hole (20) by elastic force. As a result, the rotating body (2) is locked to the fixed body (1), and the user who handles the surveillance camera support (4) feels a click and knows that the rotating body (2) is locked. .
While 30 holes (20) are formed, six protrusions (10) are formed. Of these, the five protrusions (10) are provided at equal angles, and the angular interval of the protrusions (10) is defined as a sub-angle θ2.

The sub-angle θ2 is provided as follows. First, θ3 = (360 + 360 / n) / n degrees is calculated as the virtual angle θ3. Here, as described above, when n = 30, θ3 = 12.4 degrees. When the protrusion (10) is formed for each virtual angle θ3, when the protrusion (10) is fitted in one hole (20), the adjacent hole (20) and the protrusion (10) are 12. 4-12 = 0.4 degrees off. That is, if the rotating body (2) is rotated 0.4 degrees from the state in which the protrusion (10) is fitted in one hole (20), the adjacent hole (20) and the protrusion (10) are fitted. The rotor (2) is locked.
However, as described above, the applicant assumes that the locking is performed every 2 degrees, and the angular interval θ2 of the protrusion (10) is an integer m times the virtual angle θ3, specifically, 2 / 0.4. = 5 times. Therefore, the sub-angle θ2 that is the angular interval of the protrusion (10) is 12.4 × 5 = 62 degrees. The integer m is not limited to 5, but if n = m, the sub-angle θ2 of the protrusion (10) exceeds 360 degrees, so m must be less than n.

In this way, the five protrusions (10) are provided at an angular interval θ2 of 62 degrees. Below, operation | movement of the rotation lock unit (3) of this example is demonstrated.
FIG. 4 is a schematic plan view showing the positional relationship between the hole (20) and the protrusion (10), and FIG. 5 is an explanatory diagram of the angle deviation between the hole (20) and the protrusion (10). For convenience of explanation, numbers (1) to [6] are assigned to the protrusions (10) on the fixed body (1), and the angle of [1] is set to 0 degrees as a reference. The angle shown in FIG. 5 shows the angle which turns counterclockwise (D direction of FIG. 4) from the protrusion (10) of [1].
Since the protrusion (10) is formed every 62 degrees, the hole (20) nearest to each protrusion (10) is the hole (20) opened every 60 degrees, and in FIG. Each hole (20) is shown. The angular pitch of the holes (20) shown in FIG. 4 is an integral multiple of the main angle θ1, specifically 5 times.
It is assumed that the protrusion (10) of [1] is initially fitted in the hole (20). In this state, as shown in FIG. 5 (1), the [2] projection (10) adjacent to the [1] projection (10) on the rotating side of the rotating body (2) is fitted. It is shifted to the rotating side of the rotating body (2) by 2 degrees from the power hole (20). The protrusion (10) of [3] is shifted by 4 degrees from the hole (20) to be fitted, and in the following order, the protrusion (10) of [6] is the position of the hole (20) to be fitted and the rotating body (2). It is shifted by 10 degrees on the rotation side.

From this state, when the rotating body (2) is rotated twice in the counterclockwise direction, the protrusion (10) of [2] is fitted into the hole (20) as shown in (2) of FIG. The protrusion (10) of [3] is displaced by 2 degrees from the hole (20) to be fitted, and the protrusion (10) of [4] is displaced by 4 degrees by the hole (20) to be fitted, [6] The protrusion (10) is 8 degrees apart from the hole (20) to be fitted.
In this way, when the rotating body (2) is sequentially rotated by 2 degrees, the user can feel a click feeling each time and finely adjust the rotation angle. When the rotating body (2) is rotated 10 degrees from the initial state and the protrusion (10) of [6] is fitted in the hole (20), the rotating body (2) is further rotated by 2 degrees. The body (2) rotates 12 degrees from the state shown in (1) of FIG. As shown in FIG. 3 (a), since the holes (20) are opened at intervals of 12 degrees, the protrusion (10) of [1] fits into the adjacent hole (20), and thereafter the same rotational operation is performed. repeat.

  In this example, an integral multiple of the main angle θ1 that is the angular interval of the holes (20) of the rotating body (2) and θ2 that is the angular interval of the protrusion (10) of the fixed body (1) are shifted. With a simple configuration, the rotating body (2) could be reliably locked at every minute angle. Thereby, the monitoring camera (5) can be positioned for every minute angle, and the rotational position adjustment according to the angle of view can be easily performed. In addition, since the protrusion (10) is fitted and locked in the hole (20), there is no possibility that the rotation angle will be shifted even if an impact is applied from the outside.

  In the above example, a hole (20) was opened in the rotating body (2) and a protrusion (10) was provided in the fixed body (1). Instead, as shown in FIG. The protrusion (10) may be provided on the body (2), and the hole (20) may be opened in the fixed body (1). In this case, the protrusions (10) of the rotating body (2) are provided for each main angle θ1, and in FIG. 6, for the convenience of illustration, the protrusions (60 °) are angular positions that are integer multiples of the main angle θ1 ( 10). The holes (20) of the fixed body (1) are provided every 62 degrees which is the sub-angle θ2. Moreover, it may replace with the hole (20) and the recessed part (not shown) in which a protrusion (10) fits may be sufficient.

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

(a) is a front view of a support for a surveillance camera, and (b) is a left side view of (a). It is the schematic inside a surveillance camera. (a) is an exploded view of the rotation lock unit, and (b) is a right side view of the fixed body. It is a schematic plan view which shows the positional relationship of a hole and a protrusion. It is explanatory drawing of the angle shift | offset | difference of a hole and a protrusion. It is a schematic plan view which shows the positional relationship of the hole and protrusion in another Example. It is sectional drawing of the conventional lock mechanism.

Explanation of symbols

(1) Fixed body
(2) Rotating body
(10) Projection
(20) Hole
(42) Holding piece
(43) Support piece

Claims (4)

The fixed body (1) and the rotating body (2) are made to face each other, the rotating body (2) is provided with a plurality of holes (20) or recesses, and the fixed body (1) is directed toward the holes (20) or the recesses. Provide a plurality of elastically biased protrusions (10),
On the rotating body (2), the hole (20) or the recess is provided for each main angle θ1 which is 360 / n degrees (n is an integer),
On the fixed body (1), the protrusions (10) are formed at every sub-angle θ2 that is an integer multiple of (360 + 360 / n) / n degrees less than n,
In the state where one protrusion (10) is fitted in one hole (20) or recess, the protrusion (10) is adjacent to the rotation side of the rotating body (2), and the protrusion (10) is next The hole (20) or recess to be fitted into the rotor is separated to the rotating side of the rotating body (2) by the difference between the sub-angle θ2 and the angular position of the nearest hole (20) of the protrusion (10). A locking mechanism for a rotating body. With one protrusion (10) fitted in one hole (20) or recess, the protrusion (10) is the closest to the protrusion (10) adjacent to the rotating side of the rotating body (2). The locking mechanism for a rotating body according to claim 1, wherein the angular position of the hole (20) is a value that is an integral multiple of the main angle θ1. The fixed body (1) and the rotating body (2) are made to face each other, the fixed body (1) is provided with a plurality of holes (20) or recesses, and the rotating body (2) is directed toward the holes (20) or the recesses. Provide a plurality of elastically biased protrusions (10),
On the rotating body (2), the protrusion (10) is provided for each main angle θ1 which is 360 / n degrees (n is an integer),
On the fixed body (1), the holes (20) or the recesses are formed for each sub-angle θ2 which is an integer multiple of (360 + 360 / n) / n degrees less than n,
In the state where one protrusion (10) is fitted in one hole (20) or recess, the hole (20) or recess is the hole (20) or recess adjacent to the rotating side of the rotating body (2). The protrusion (10) to be fitted next is the rotation side of the rotating body (2) by the difference between the sub-angle θ2 and the angular position of the protrusion (10) nearest to the hole (20) or the recess. The rotary body locking mechanism is characterized by being spaced apart from each other. At least a support piece (43) for holding the electrical equipment rotatably, and a holding piece (42) for holding the support piece (43) rotatably, the support piece (43) is provided on the holding piece (42). A support for an electric device using the lock mechanism according to any one of claims 1 to 3 at a rotation center portion.

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