JPH0435676Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a flexible positioning system that allows the direction of the nipple opening relative to the object to be freely set when the grease nipple is screwed onto the object. Regarding grease nipples.

[Conventional technology]

Generally, some grease nipples have a nipple opening oriented in a direction intersecting the axis of the threaded portion. In addition, in the threaded portion, regardless of whether the formed mounting thread is a single thread or a multi-thread thread, the position where the effective thread starts to be formed on the side closer to the nipple opening is a specific relative position with respect to the orientation of the nipple opening. There is no relationship. Furthermore, the position at which the internal thread begins to be formed on the attachment object that is threadedly engaged with the grease nipple is also independent of the orientation of the nipple opening.

When screwing this grease nipple onto the object to be installed, a predetermined tightening force is applied based on the permissible contact surface pressure of the thread to prevent grease from leaking from the mounting thread and to prevent the thread from loosening. However, when screwed in this way, the orientation of the nipple opening relative to the object to which it is attached differs depending on each grease nipple and is usually not constant.

[Problem that the invention attempts to solve]

Therefore, for such a grease nipple, if you specify the orientation of the nipple opening when screwed onto the object to be installed, if you stop tightening and install it when the nipple opening is in the specified direction, the permissible contact will be increased. In most cases, the situation is over-tightening exceeding the surface pressure or under-tightening below the specified tightening force, and it is not a coincidence that the nipple opening is oriented exactly as specified when screwed in with the specified tightening force. cannot be expected.

If the nipple is installed with insufficient tightening, the grease may leak, or
Alternatively, the screwed grease nipple may become loose due to mechanical vibration of the object to be attached. In addition, when over-tightening occurs, if the material of the object to be mounted has strong toughness such as steel, plastic deformation of the thread will not occur even if the specified tightening force is exceeded, but if the material is, for example, aluminum or In the case of synthetic resin or the like, there is a problem in that the threads are easily plastically deformed or damaged due to their low mechanical strength.

Therefore, in order to avoid such problems, it is necessary to screw a large number of grease nipples onto the object to which they are to be attached, and select through trial and error the one whose nipple opening faces in the specified direction with the specified tightening force. The following problem arises.

This invention was made in consideration of such conventional problems, and even if any grease nipple is installed in a screw hole, the position of the nipple can be fixed at the desired position, and grease leakage does not occur. Another object of the present invention is to provide a grease nipple that does not loosen due to vibration.

[Means for solving problems]

This invention is based on a grease nipple in which a nipple opening for injecting grease is formed in a direction intersecting the axis of the mounting thread, and one pitch of the mounting thread near the nipple opening is filled with rubber or synthetic resin. An elastic body such as resin was welded into a ring shape.

[Effect]

An elastic material such as rubber is welded in an annular shape to one pitch of the threaded portion of the grease nipple on the side near the nipple opening, so when this grease nipple is screwed onto an object, it will fit in the specified position. Approximately one screw thread before the tightening force is reached, an elastic body is inserted between the male and female threads to prevent the press-fitted grease from leaking out. In addition, the direction of the nipple opening can be changed 360° with one rotation of the screw, so the direction of the nipple opening can be changed from the state where the elastic body is bitten to the specified direction by screwing the elastic body. It can be set by compressing within 1 pitch. Therefore, on-site matching work to select a suitable grease nipple from a large number of grease nipples is unnecessary.

〔Example〕

This invention will be explained below with reference to the drawings. 1 to 3 are diagrams showing an embodiment of this invention.

FIG. 1 is an overall side view of a grease nipple 1, and 2 is a nipple opening into which grease is injected. 3 is a ball valve with a nipple opening, and grease is passed from here to ball 3 using a grease gun.
It is press-fitted inside by pushing it back. Reference numeral 4 denotes a mounting screw part provided for screwing the grease nipple 1 onto an object to be mounted, and 5 a welded part so as to cover the incomplete threaded part of the mounting thread part 4 and one thread continuous thereto. It is a ring-shaped rubber. Note that instead of this rubber, a synthetic resin such as urethane having rubber-like elasticity can also be used. Furthermore, although welding is used as the fixing means in this embodiment, adhesive may also be used in addition to welding. In this embodiment, a so-called C-shaped grease nipple in which the nipple opening 2 is oriented in a direction perpendicular to the axis 6 of the mounting screw portion 4 is used as the grease nipple 1.

FIG. 2 shows an example in which such a grease nipple 1 is attached to the end cap 11 of the linear guide device 10. FIG. 3 is a diagram showing an example in which the grease nipple of the present invention is used in a linear guide device different from that in FIG. It is specified by.

Now, when this grease nipple 1 is screwed onto the end cap 11 which is the object to be attached, if the nipple opening 2 bites into the rubber 5 in a direction other than that shown in FIG. As the threads begin to compress the rubber 5, no grease leakage or loosening of the mounting thread 4 occurs, but it takes one rotation to rotate the nipple port 2 from this position to the position shown in Figure 3. In other words, it is sufficient to compress the rubber 5 by an amount equal to or less than one pitch of the screw. There are few cases in which the rubber 5 is compressed by nearly one pitch, and in many cases, the nipple opening can be oriented in the specified direction by a slight compression.
In this way, the grease nipple 1 can be screwed onto the object to be installed without exceeding a predetermined tightening force. The allowable contact surface pressure of the material will not be exceeded, and no plastic deformation or damage will occur.

Note that in the above embodiment, the orientation of the nipple opening 2 was oriented in a direction perpendicular to the axis 6 of the mounting screw portion 4; This can be effectively used for all types of nipples that face in the direction that intersects 6.

[Effect of idea]

As explained above, according to this invention, (1) the nipple opening can be positioned freely in the required direction without loosening, and (2) the nipple opening can be mounted by fitting an elastic material such as rubber between the threaded surfaces. It has a loosening effect against mechanical vibrations of the target object. (3) The elastic body bites into the screw thread and makes a close contact, preventing grease from leaking. (4) Even if the grease nipple is tightened strongly, it will not loosen. On the other hand, it can be effectively used without loosening even on objects to which aluminum or synthetic resin materials are attached, which are less effective.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the grease nipple of the present invention, Fig. 2 is a perspective view showing the grease nipple of the present invention used in a linear guide device, and Fig. 3 is a linear guide different from Fig. 2. FIG. 2 is a front view showing a state in which the grease nipple of the present invention is used in a device. 1... Grease nipple, 2... Nipple opening,
4...Mounting screw part, 5...Rubber (elastic body), 6...
...Axis of the mounting screw.

Claims (1)

[Scope of utility model registration request] In a grease nipple where the nipple port for injecting grease is oriented in a direction that intersects the axis of the mounting thread, one pitch of the mounting thread on the side near the nipple port is made of elastic material such as rubber or synthetic resin. A freely positionable grease nipple whose body is welded in an annular shape.