JPH0132106Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for locking a knob for rotating a rotating shaft of a precision instrument or the like after use.

[Conventional technology] In the past, if the rotating shaft of a precision instrument, etc. was adjusted by rotating it with a knob and then left for a long time, the rotating shaft would rotate due to vibration etc. and the adjustment position would shift. existed.

[Problem to be solved by the invention] Therefore, in the present invention, after adjusting the rotating shaft of a precision instrument by rotating it using a knob, this knob is locked, and the knob and rotating shaft are rotated to make adjustments. To provide a locking device for a knob which is intended to prevent the knob from going out of position and which can be realized with a simple and compact structure.

[Means for Solving the Problems] The knob locking device of the present invention includes a rotating shaft, a fixed part that rotatably supports the rotating shaft, and a fixed part fixed to the tip of the rotating shaft and located at the outer circumferential position of the fixed shaft. A knob that faces the fixed part through a gap, a hole with a bottom that is bored parallel to the rotational axis on the surface facing the knob of the fixed part and at a position on the outer periphery of the rotational axis, and the bottom surface of this hole. and a protrusion disposed eccentrically from the central axis of the hole, and an inclined surface that is fitted into the hole so as to be rotatable and slidable in the axial direction, and is in contact with the protrusion on the rear end surface. , a press pin whose front end comes into contact with the knob in the rotation range, a plate spring fixed on the face of the fixed part facing the knob and biasing the press pin toward the protrusion, and a plate spring connected to the side of the press pin to swing. It is characterized by consisting of an operable lock lever.

[Function] The knob locking device of the present invention is such that when the lock lever is rotated after the adjustment of the rotation shaft is completed with the knob, the inclined surface of the rear end surface engages with the pressing pin and presses while rotating. The pin slides through the hole toward the knob, and its tip abuts and locks the knob. If the lock lever is rotated in the opposite direction, the press pin will separate from the knob and the lock will be released.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 shows a locking mechanism for a knob of a precision instrument. In the figure, 1 is a rotating shaft, and 2 is a fixed part of the main body of the precision instrument. A rotating shaft 1 is disposed in a shaft hole 3 formed in a fixed part 2 and rotatably supported by bearings 4 and 5. Further, the tip of the rotating shaft 1 protrudes from the fixed portion 2, and a knob 6 is fixed thereto.
A flange portion 10 is disposed at the end of the fixed portion 2 where the knob 6 is attached, and the knob 6 is positioned with a gap between the knob 6 and the flange portion 10. A bottomed hole 11 is bored in the flange 10 surface of the outer periphery of the shaft hole 3 in parallel with the shaft hole 3, and a protrusion 12 is arranged eccentrically from the central axis of the hole 11 on the bottom surface of the hole 11. will be established. That is, an adjustment screw is screwed into the side surface of the flange portion 10 and projected into the hole portion 11. Further, the flange portion 10 is formed with a fan-shaped cutout portion 13 that opens toward the outer periphery and communicates with the hole portion 11 . In addition, the hole 11
A press pin 14 is fitted into the inside so as to be rotatable and slidable in the axial direction. This pressing pin 14
has an inclined surface 15 formed on its rear end surface, and its front end protrudes from the flange portion 10 into the gap between it and the knob 6. A leaf spring 16 is attached to the flange portion 10.
is disposed, and the leaf spring 16 presses the pressing pin 14 toward the protrusion 12 to keep the inclined surface 15 of the pressing pin 14 and the tip of the protrusion 12 in constant contact. In addition,
The angle of inclination of the inclined surface 15 of the pressing pin 14 and the length of the pressing pin 14 are determined by the lock lever 1 of the pressing pin 14.
The tip of the pressing pin 14 is configured to abut against the surface of the knob 6 facing the flange portion 10 within the rotation range by the operation of the knob 6. A lock lever 17 has its tip connected to the side of the pressing pin 14 and is disposed within the notch 13 of the flange portion 10 so as to be able to swing around the pressing pin 14 as an axis.

This locking device rotates the locking lever 17 when the adjustment of the rotating shaft 1 is completed using the knob 6.
The inclined surface 15 at the rear end of the pressing pin 14 is pressed by the protrusion 12, and the contact position moves toward the rear end of the inclined surface 15, so that the pressing pin 14 resists the elasticity of the leaf spring 16.
moves toward the knob 6, and the tip of the pressing pin 14 presses the opposing surface of the flange portion 10 of the knob 6, thereby locking the knob 6. On the other hand, when releasing the locked state of the knob 6, when the lock lever 17 is rotated in the opposite direction, the pressing pin 14 is pressed in the direction of the protrusion 12 by the leaf spring 16, so that the pressing pin 1
The adjustment screw 12 comes into contact with the front end side of the inclined surface 15 of the knob 6, and therefore the press pin 14 moves toward the rear end, and the tip of the press pin 14 touches the flange part 1 of the knob 6.
Move away from the opposite surface and unlock the knob 6.

[Effects] This invention is constructed as claimed in the utility model registration based on the embodiments described above, so that it is possible to lock the knob after adjusting the rotation axis of precision equipment, etc. using the knob. Therefore, the locking device can be made small with a simple structure.

[Brief explanation of the drawing]

FIG. 1 represents a cross-sectional view of the locking device. 1... Rotating shaft, 2... Fixed part, 3... Hole part,
4, 5...Bearing, 6...Knob, 10...Flange, 11...Hole, 12...Adjustment screw, 1
3... Notch, 14... Pressing pin, 15... Inclined surface, 16... Leaf spring, 17... Lock lever.

Claims (1)

[Scope of utility model registration request] a rotating shaft, a fixing part that rotatably supports the rotating shaft, a knob fixedly attached to the tip of the rotating shaft and facing the fixing part through a gap at an outer circumferential position of the fixing shaft; A hole with a bottom is bored parallel to the rotation axis on the surface facing the knob and at an outer peripheral position from the rotation axis; The arranged protrusions and
a pressing pin that is rotatably and slidably fitted into the hole and has a rear end surface that is in contact with the protrusion, and whose front end abuts the knob within a rotational range; and the fixing part. A knob locking device comprising: a plate spring fixedly installed on a surface facing the knob to urge the pressing pin toward the protrusion; and a lock lever connected to a side of the pressing pin and capable of swinging operation.