JPH0715045Y2 - Depression / elevation angle adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for adjusting the depression / elevation angle of a pole operation arm, and more specifically, it is mounted on one of the two pole operation arms. It is possible to adjust the tightening between the lamp and the lamp (spotlight) by manual work such as operating the manual handle or the pole operation arm directly, or by using the pole operation rod. The present invention relates to a device for adjusting the depression / elevation angle of a pole operation with a new structure for adjusting the depression / elevation angle to an arm.

[Prior Art] Recently, on the ceiling of a stage or a TV studio, a lot of spotlights are hung to adjust the elevation angle of a lamp using a pole operation rod.

In this type of spotlight, an adjusting device having the following structure is attached to one end of a pole operation arm bent in a U shape. That is, a worm vertically installed in a gear box having a portion for fitting the end of the pole operation arm to the upper portion and a worm wheel meshing at a right angle with the worm are accommodated, and the tip of the worm wheel is further provided with a leaf spring. The structure is such that it is pressed into contact with the clutch mechanism including the receiving member, and the whole is axially attached to the side wall of the lamp body by a shaft that penetrates the axis of each component.

When the lamp body is to be lowered, the worker first inserts the pole operation control rod into the cup handle connected to the worm part of the gear box of the spotlight suspended at a high ceiling, and inserts the pole operation control rod into the hook and worm. Connect with the connected cup handle. Next, rotate the pole operation rod, rotate the cup handle and worm, and rotate the worm wheel around the shaft. As the worm wheel rotates, forward / backward movement of the worm wheel occurs, and as a result, the frictional force of the clutch mechanism including the leaf spring and the receiving member that are pressed against each other at the tip of the worm wheel fluctuates. The mutual tightening force between the side wall and the clutch plate can be adjusted, so that the elevation angle of the lamp can be changed appropriately.

By the way, the hanging work of this kind of spotlight on the ceiling is generally performed as follows. That is, first, the spotlight is delivered from the spotlight manufacturer.
Since the delivered spotlight is designed for pole operation, the side wall of the lamp body and the adjusting device are strongly tightened by a shaft passing through the axis. In this state, after attaching the spotlight to the baton, the baton is raised and the spotlight is hung on the ceiling. Therefore, the elevation angle of the suspended spotlight is the same as when it was attached to the baton.

Then, the above-described operation is performed using the pole operation operating rod to adjust the elevation angle of the lamp body to a predetermined angle.

[Problems to be solved by the invention] However, this operation, in particular, the elevation movement of the lamp body when using the pole operation operation rod is extremely slow, and is unsatisfactory with respect to a request for emergency installation of a spotlight or the like. Is.

Therefore, on the stage or in the TV studio, before manually attaching the spotlight to the baton, the operator manually adjusts the angle between the side wall of the lamp and the adjustment device, and roughly adjusts the angle between the pole operation arm and the lamp in advance. It is often done to decide on (it is said to be rough training).

After that, the baton is raised and the spotlight is hung on the ceiling, and then the pole operation control rod is used to finely adjust the elevation angle of the lamp body.

However, when such rough charging is performed, the balance of the tightening force between the adjusting device and the lamp body, which is maintained according to the design standard via the clutch mechanism including the bending angle and the leaf spring, is lost. . That is, the balance of the clutch mechanism including the leaf spring and the receiver is lost due to an unexpected force during rough charging. As a result, after hanging the spotlight,
Pole operation may not be performed smoothly.

The present invention is to raise or lower the spotlight attached to the pole operation arm by loosening the above-mentioned rough charge by rotating the manual handle and then tightening it or by directly rotating the pole operation arm around the shaft. An object is to provide an angle adjusting device.

[Means for Solving Problems] A depression / elevation angle adjusting device of a lamp body according to the present invention comprises a pole operation arm for holding the lamp body and a fitting portion for fitting an end portion of the pole operation arm at an upper portion. A leaf spring having a worm vertically installed in a gear box, a worm wheel meshing with the worm at a right angle, and a central hole that is joined to a protrusion at a step end formed around the axis of the worm wheel. And a shaft having a manual handle at one end, the worm wheel and the axial center of the leaf spring are inserted, and the protrusion of the step end of the worm wheel and the leaf spring are in pressure contact with each other, It is characterized in that it is pivotally attached to a receiver on the side wall of the lamp body, and the depression and elevation angle of the lamp body is adjusted by loosening and tightening the manual handle.

[Specific Description] Hereinafter, the adjusting device of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a vertical sectional view of the adjusting device, and FIG. 2 is a front view thereof. In the figure, 1 is a gear box. On the upper part of the gear box 1, a fitting portion 1a for inserting the tip of the pole operation arm 2 and fixing the pole operation arm 2 to the gear box 1 is provided in a protruding manner.

In the gear box 1, a worm 3 is vertically installed, and a worm wheel 4 that meshes with the worm 3 at a right angle is housed therein. The tip of the worm wheel 4 is a step portion 4a, and a part of the worm wheel 4 projects from one end (working end) 1c of the gear box 1. The other end 4b of the worm wheel is connected to the stopper plate 6 via a bearing 5 such as a thrust bearing.

Reference numeral 7 denotes a leaf spring having, for example, a rectangular or oval center hole 7a, the periphery of which is locked by a locking portion 8a formed at the peripheral edge of the receiving member 8.

Into the central hole 7a of the leaf spring 7, the protrusion 4a 'of the tip step 4a of the worm wheel 4 is fitted. Therefore, the protrusion
The cross-sectional shape of 4a 'is substantially the same as the central hole 7a of the leaf spring.

9 has a manual handle 9a at one end and a screw at the other end.
The shaft 9b is cut through the shaft of each of the gear box 1, the bearing 5, the worm wheel 4, the leaf spring 7, and the receiving member 8.

By tightening the screw part 9b of the shaft and the nut 10,
The gear box 1, the leaf spring 7, and the receiving member 8 are mounted on the side wall 11 of the lamp body with a predetermined tightening force.

Thus, the leaf spring 7 is pressed against the peripheral surface of the step portion 4a of the worm wheel 4 around the center hole 7a. This pressure contact state can be arbitrarily adjusted depending on the tightness of the shaft 9.

Incidentally, 1b is a play section for allowing the movement of the stopper plate accompanying the forward / backward movement of the shaft 9. Further, 3a in FIG. 2 is a cup handle for rotating the worm 3.

The adjusting device of the present invention can be operated as follows.

First, the adjusting device is delivered to the hanging place while being tightly tightened on the side wall 11 of the lamp body. The operator turns the manual handle 9a to loosen the tightened state with the nut 10.

Then, the operator manually holds the lamp body with respect to the pole operation arm 2 at an appropriate angle, and then turns the manual handle 9a to tighten the adjusting device on the lamp body side wall 11 again.

After that, attach the spotlight to the baton and raise the baton to suspend the spotlight on the ceiling. Then, the fine adjustment of the elevation angle of the lamp body may be performed by rotating the worm 3 with the pole operation operating rod as in the conventional case.

The rotation of the worm 3 is transmitted to the worm wheel 4 and converted into a forward movement or a backward movement in the axial direction of the worm wheel. As a result, the force for pressing the leaf spring 7 through the step 4a changes. Due to the magnitude of the pressure contact force, the leaf spring 7 can exert a clutch effect in relation to the receiving member 8.

That is, when the pressure contact force applied to the leaf spring 7 is smaller than the frictional force between the peripheral edge of the leaf spring 7 and the peripheral end locking portion 8a of the receiver 8, the rotation starts at the position of the step portion 4a and the lamp body Makes a gesture of depression. In the opposite case, since the leaf spring 7 begins to idle at the peripheral end locking portion 8a, the lamp body does not come down.

[Advantages of the Invention] As is clear from the above description, the adjusting device of the present invention does not include the clutch mechanism mounted in the conventional device. Therefore, even if rough charging is performed, the pole operation operation will not be hindered after the suspension. Therefore, it is of great practical value when it is used for emergency installation of spotlights.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of the adjusting device of the present invention, and FIG. 2 is a front view thereof. 1 …… Gearbox 1a …… Fitting part 1b …… Play area 1c …… Gearbox end 2 …… Pole operation arm 3 …… Worm 3a …… Cup handle 4 …… Worm wheel 4a …… Step 4a ′… … Step protrusion 5 …… Bearing 6 …… Stopper plate 7 …… Flat spring 7a …… Plate spring center hole 8 …… Receptor 8a …… Locking portion 9 …… Shaft 9a …… Handwheel 9b …… Screw 10 …… Nut 11 …… Side wall of lamp

Claims (1)

[Scope of utility model registration request] 1. A pole operation arm for holding a lamp body, a worm suspended in a gear box provided with a fitting portion for fitting an end portion of the pole operation arm in an upper portion, and a worm perpendicular to the worm. A worm wheel that meshes with the worm wheel; a leaf spring having a central hole that is joined to a protrusion of a step end formed around the axis of the worm wheel; and a shaft having a manual handle at one end thereof. And through the axial center of the leaf spring, the projecting portion of the step end of the worm wheel and the leaf spring come into pressure contact with each other, and are axially attached to the receiver on the side wall of the lamp body. An elevation angle adjustment device for a lamp body that adjusts the elevation angle of the lamp body by tightening.