| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent muddy water etc. from intruding into a valve mounting hole into which a grease supply valve is screwed. <P>SOLUTION: The valve mounting hole 30 composed of a female screw hole 30A located at depth side and a large-diameter cylindrical hole 30B located at opening end side is provided at one end side of a grease passage 29 provided in a frame side rod 24. An annular groove 38 that corresponds to the large-diameter cylindrical hole 30B of the valve mounting hole 30 is formed at the rear side in the screwing direction from a male screw 35 screwed into the female screw hole 30A of the valve mounting hole 30 of a lubricating valve body 32 that constitutes the lubricating valve 31. A seal ring 39 is fitted and attached to the annular groove 38. Thereby, when the lubricating valve 31 is screwed into the valve mounting hole 30, a space between the outer circumferential surface of the lubricating valve body 32 and the inner circumferential surface of the large-diameter cylindrical hole 30B of the valve mounting hole 30 can be sealed by the seal ring 39 and the intrusion of muddy water etc. into the valve mounting hole 30 can be prevented. <P>COPYRIGHT: (C)2012,JPO&INPIT |
