JPH03566Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a free-wheel drive system consisting of a plurality of nuts held by two parallel rails so that the pitch between adjacent nuts is variable. Regarding pituti nuts.

[Conventional technology and its problems]

For example, the claws of a claw chuck have a hard or soft top jack bolted to a master jack attached to the chuck body in a removable manner. In this case, 2 pieces are required for fixing one top gear.
A nut is used, and the nut is locked by inserting a collar on its outer surface into a dovetail groove formed in the master jaw. As shown in Figure 5. 1 in this figure is a nut with flanges 1a on both sides, 2
is a master jaw, 2a is a dovetail groove for locking the nut 1, and 3 is a serration 4 provided on both contact surfaces.
4a is a bolt hole provided in the top jaw, 5 is a fastening bolt that is screwed into the nut 1 to fix the top jaw to the master jaw, and the bolt 5 and the nut are There are two pieces of 1 at different positions in the direction perpendicular to the plane of the paper.

By the way, the work of inserting multiple nuts into narrow dovetail grooves, etc., and screwing together the bolts passed through the object to be fixed (the top bolt in the figure) is laborious and reduces work efficiency because the nuts are assembled separately. bad. In particular, if the pitch between bolts changes due to replacement of the fixed object, etc., the pitch between nuts must be adjusted accordingly. At this time, if there is excess space in the nut insertion groove etc. as shown in the diagram, As Natsu's posture changes, the above-mentioned problem becomes more noticeable.

The main purpose of this invention is to solve this problem.

Furthermore, in the above-mentioned nuts used for claw chucks, or nuts similar thereto, cracks often occur at the base of the collar 1a due to the pulling force of the bolt. In order to eliminate this problem, it is possible to use a highly rigid material for the nut, but it is uneconomical to use expensive material for the entire nut. Therefore, this invention attempts to provide a free pituti nut that is also effective for this problem.

[Means for Solving the Problems] The free pitch nut of this invention is arranged between two parallel rails that are connected to each other at at least one point, so that the axis of the screw hole is perpendicular to the longitudinal direction and the width direction of the rail. A plurality of nuts are arranged in the longitudinal direction of the rail, and the above two parallel rails are recessed into the rail insertion grooves provided on the outer surface on both sides of each nut, so that all the nuts are or All nuts except one can slide along the parallel rails in the longitudinal direction of the rails.

This free pit nut allows multiple nuts supported by parallel rails to be inserted into a dovetail groove, etc. together with the parallel rail, and by screwing a bolt into any one nut. Since the other nuts are also attracted to the bolt side, there is no change in the posture of the other nuts, there is no possibility of them falling, and the workability of bolting is greatly improved. Moreover, Natsuto
Since all but one bolt can slide along parallel rails, changes in pitch between bolts can be easily dealt with.

In addition, if a high-rigidity material such as tool steel is used for the parallel rails, the load-bearing part of the nut can be reinforced by the rail even if the nut is made of general mechanical structural carbon steel, spring steel, etc. Therefore, it is also possible to reduce cracks occurring in the load supporting portion. This point will be explained in more detail later.

〔Example〕

FIG. 1 shows a first embodiment of this invention. This free pit nut 10 has two straight rails 11, 11 arranged in parallel, and two nuts 13 supported by an integrated parallel rail interconnected by one horizontal bar 12.

Each nut 13 has a collar 14 on both sides,
A groove 15 into which the rails 11, 11 are loosely fitted
is provided. Note that both ends of each rail 11 are bent in a direction toward each other to prevent the nuts from falling off, and the horizontal bar 12 holds one nut 13 in place between it and the bent part of the rail end. It's in the place where it's fixed. Thus, the exemplary free pit nut is such that only the other nut can slide relative to the parallel rails. However, the attachment position of the horizontal beam may be changed arbitrarily, and depending on the attachment position of the horizontal beam to the parallel rail, all the nuts can be made slidable.

FIG. 2 is a sectional view when the top jaw 3 of the claw chuck is fixed to the master jaw 2 using the free pitch nut 10 as an example, and shows the bolt 5.
By tightening, the gap between the rail 11 and the nut is completely filled, creating the same condition as if the rail 11 were integrally buried in the collar 14.
Therefore, if the rail 11 at this time is made of a material with higher rigidity than the material of the nut, the effect of reinforcing the collar 14 will be obtained.

FIG. 3 shows a nut 10 in which parallel rails are formed into a nearly circular ring. This nut is suitable for fixing to each other a flange F and an object A supporting or supported by it, as shown in FIG.

Note that, as can be understood from the above two embodiments, the plan view shape of the parallel rails can be arbitrarily changed according to the arrangement state of the bolts.

〔effect〕

As mentioned above, the free pitch nut of this invention is provided by installing a plurality of nuts between two mutually connected parallel rails by recessing the rails into the grooves provided in the nuts. All or all but one of the nuts are attached so that they can slide in the longitudinal direction of the parallel rails, so even if the nut insertion space is restricted, all the necessary nuts can be inserted at once. Yes, also 1
By temporarily tightening one nut, other nuts can also be temporarily held in approximately the same position, and furthermore,
By displacing the slidable nut, it is possible to easily deal with changes in the pitch between the bolts, and therefore, the effect of facilitating and speeding up the bolting operation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of this invention;
Fig. 2 is a sectional view of its usage state, Fig. 3 is a perspective view of another embodiment, and Fig. 4 is a sectional view of its usage state.
FIG. 5 is a sectional view for explaining the problem of this invention. 10...Free Pituchinatsu, 11...Rail, 12...Horizontal beam, 13...Natsuto, 14...
Tsuba, 15...Rail insertion groove.

Claims (1)

[Scope of utility model registration request] A plurality of nuts are installed between two parallel rails interconnected by a horizontal crosspiece in at least one place, the axis of the screw hole being perpendicular to the longitudinal direction and width direction of the rail,
The above-mentioned two parallel rails are arranged in the longitudinal direction of the rails and fit into the rail insertion grooves provided on the outer surface of both sides of each nut in a recessed state, so that all the nuts or all but one of the nuts A free pitch nut that can slide freely in the longitudinal direction of the parallel rails.