JPH0745854Y2 - Limit switch roller lever - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use of the Invention] The present invention relates to a roller lever, and particularly to support of a roller.

[Prior Art] Conventionally, a roller lever used for operating a limit switch for position detection rotatably supports a roller by a support shaft fixed to a free end portion of the lever.

[Problems in Prior Art] In such a roller lever, usually, the cleanliness between the roller and the support shaft, the roughness of the sliding surface, the grease and the like reduce wear and smooth the rotation, but the vibration and vibration In an impact environment, the movement between the roller and the support shaft causes the roller or the support shaft to wear, and eventually the roller falls off the lever. In order to solve such a problem, a method of limiting the movement of the roller by interposing a spring member such as a corrugated washer between the roller and the support shaft can be considered, but sliding and rotation are not smooth, and the size is There is a fear that the rotational force of the roller will change significantly due to the variation of.

[Object of the Invention] In view of such conventional problems, the present invention reduces wear between the roller and the support shaft as much as possible without impairing the smoothness between the roller and the support shaft, and provides long-term operation. The purpose is to obtain a stable roller lever.

[Outline of the Invention] In order to achieve the object, the present invention provides an O-ring between a roller that is rotated by an external actuator and a support shaft that supports the roller. Reduces vibration and shock.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

That is, in FIG. 1, a well-known built-in switch is accommodated inside the housing 1, and a cover 3 is attached to the opening (not shown) by screws 4 and 4. A head 5 is attached to the upper part of the housing 1, and one end of a lever 7 is attached to a rotary shaft 6 supported by the head. Further, in FIG. 1, a support shaft 9 extending in a direction intersecting with the axis of the lever is fixed to the other end of the lever 7. One end of this support shaft is fitted into the lever 7, and the other end is provided with a boss portion 11 for preventing the roller 10 from coming off. The support shaft 9 has a roller 10 which is rotated by an external actuator (not shown).
Is rotatably attached. A groove 12 is provided along the inner peripheral surface of the shaft hole, which is in sliding contact with the support shaft 9 of the roller. An O-ring 13 is housed in this groove. Therefore, when the support shaft 9 is fitted into the roller 10, the inner circumference of the O-ring 13 also contacts the outer peripheral surface of the support shaft 9.

Although the groove 12 has been described as being provided on the peripheral surface without the roller 10, it may be provided along the outer peripheral surface of the support shaft 9. In this case, the outer periphery of the O-ring 13 is in sliding contact with the inner peripheral surface of the roller 10.

Further, by providing a plurality of grooves 12, preferably two grooves 12 as shown in FIG. 4, the movement of the roller 10 is further stabilized. The grooves 12 may be provided on the inner peripheral surface of the shaft hole of the roller 10.

[Advantage of the Invention] As described above, the present invention has the O-ring 13 provided between the roller 10 and the support shaft for rotatably supporting the roller 10. Therefore, when the roller 10 is rotated, vibration or impact is applied to the roller. However, those vibrations and shocks are absorbed by the O-ring 13.
Therefore, the roller 10 and the support shaft 9 are less likely to be damaged or worn, and therefore, the roller has an advantage of stable operation over a long period of time.

[Brief description of drawings]

FIG. 1 is a front view showing a limit switch to which a roller lever according to the present invention is applied, FIG. 2 is a side sectional view showing an embodiment of a roller lever of the limit switch according to the present invention, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a side sectional view showing an example, FIG. 4 is a side sectional view showing a third embodiment of the present invention, and FIG. 5 is a change amount characteristic diagram showing how the roller and the lever of the roller lever in the present invention change with time. FIG. 6 is a change amount characteristic diagram showing how the roller and the lever of the roller lever using the conventional hardened steel roller change with time. 1 …… Housing 3 …… Cover 4 …… Screw 5 …… Head 6 …… Rotating shaft 7 …… Lever 9 …… Spindle 10 …… Roller 11 …… Boss 12 …… Groove 13 …… O-ring

Claims (3)

[Scope of utility model registration request] 1. A rotating shaft (6) rotatably directed to a head (5) and a lever (7) having one end connected to this rotating shaft.
And a support shaft (9) fixed to the other end of the lever so as to intersect the axis of the lever, and a roller (10) rotatably supported by the support shaft and rotated by an external actuator. , A roller lever for a limit switch equipped with an O-ring (13) provided between this roller and the support shaft. 2. A roller lever for a limit switch according to claim 1, wherein the O-ring (13) engages with a groove provided along the outer periphery of the support shaft (9). 3. The O-ring (13) is the roller (10).
A roller lever for a limit switch according to claim 1, wherein the roller lever is engaged in a groove (12) provided on the inner surface of the shaft hole.