JPH0226564Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention moves a plurality of chuck claw pieces in the radial direction by rotating a scroll structural member, and uses a pipe member passing through the center of the chuck body or a circular This invention relates to a scroll chuck that grips and releases an object such as a rod by biting the plurality of chuck claw pieces into the peripheral surface of the object.

(Prior Art) As disclosed in Japanese Unexamined Patent Publication No. 53-115984, a chuck is provided with pawls guided in a radially adjustable manner within the chuck body, and these pawls are engaged with a drive member for adjustment. In mating chucks, the pawl is divided into an axially forward pawl portion and an axially rear pawl portion, each of both pawl portions being radially adjustable within the body. Only the rear pawl engages with the drive member, and is provided with a clutch member that can be connected and disconnected by external operation. In the connected state, this clutch member The two pawl parts are joined in such a way that the front pawl part is radially carried by the pawl part, whereas in the sheared state the front pawl part adjusts radially independently of the rear pawl part. A chuck for a lathe is known in which the front pawl portion is released so as to allow the front pawl to be opened. The present invention is different from this, in that the entire chuck claw piece is separated from a plurality of moving pieces that mesh with the scroll structural member, and the chuck claw piece is placed either radially outward or inward with respect to the moving pieces. It has a configuration that allows it to be connected.

(Problems to be Solved by the Invention) The present invention solves the following problems when changing the object to be gripped from a large outer diameter to a narrow outer diameter, or from a thin outer diameter to a large outer diameter. The object of the present invention is to move only the chuck claw pieces in the radial direction to accommodate changes in the outer diameter of the gripped material.

(Means for Solving the Problems) The present invention aims to specifically solve the problems mentioned in the previous section, and the scroll structure member 1 is The scroll structural material 1
A plurality of moving pieces 11 and chuck claw pieces 13 that mesh with each other.
moves radially inward to grab a pipe, round bar, etc.
Alternatively, in a scroll chuck that moves radially outward to release, the entire chuck claw pieces that move in the radial direction together with the moving pieces 11 are separably overlapped in the rotational direction of the scroll structural member 1, and each of the moving pieces 11 Several engaging holes 12, 12 are provided in the radial direction, and an engaging pin 17 is inserted into the chuck claw piece 13 by selecting one of the several engaging holes 12, 12 to be engaged. The present invention relates to a scroll chuck characterized in that a spring 19 is wound around and a knob 20 of the engaging pin 17 is attached to the outer surface, and an inventive step is provided in which the chuck claw piece can easily adapt to changes in the outer diameter of the object to be grasped. Motsu.

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

(Example) Fig. 1 is a partially cutaway front view of the scroll chuck of the present invention, and Fig. 2 is a partially cutaway side view of the same.
In the figure, 1 is a donut-shaped scroll structure with spiral engagement teeth, and 2 is a circular shape with an L-shaped cross section, with an insertion hole 3 in the center for the objects a and a' to be gripped, such as tubes and round bars. In the chuck body, chuck claw guide grooves 4 are provided in the radial direction at intervals of 120° as shown in FIG. 1, and guide grooves 5, 5 are formed on both sides of the grooves 4 as shown in FIG. The chuck body 2 is provided with a ring piece 6 constituting the outer periphery of the insertion hole 3, and the scroll structural member 1 is rotatably supported on the outer periphery of the ring piece 6. Reference numeral 7 denotes a circular handle member which is fitted onto the outer periphery of the chuck body 2 to allow free rotation, and a connecting plate 8 extending radially inward engages with the outer periphery of the scroll structural member 1. The scroll structural member 1 and the connecting plate 8 are covered by a cover attached to the ring piece 6 (the cover is not shown). The above structure is a conventional structure and can be freely formed within a known range.

The present invention provides a movable piece 11 that moves in the radial direction by meshing the scroll with the spiral scroll of the scroll structural member 1, and a chuck claw piece 13 without making a part of the chuck claw piece 13 into a substantially integral structure. Part of the gist of the invention is to form the entirety of the moving piece 11 separately from the moving piece 11. The chuck claw piece 13 is superimposed on the back of the moving piece 11 as shown in FIG. 2, and the chuck claw piece 13 of FIG. The chuck claw piece 13 is fitted into the guide groove 4, and several engagement holes 12, 12 are provided in the radial direction on the back surface of the movable piece 11 as shown in FIGS. 2 and 4.
Wing-shaped slide protrusions 1 shown in Fig. 4 on both sides of the
5, 15 are formed and passed through the guide grooves 5, 5.
(Figures 3 and 4). In addition, the handle part 1 of the chuck claw piece 13
4 is provided with a pin-fitting hole 16 with an open surface corresponding to the moving piece 11 as shown in FIG.
6 is fitted with an engaging pin 17 for fitting the head 18 into either of the engaging holes 12, 12, passed through to the outer surface of the handle 14, and the head 18 and the outer wall of the hole 16 are inserted into the pin fitting hole 16. A spring 19 for assisting the fitting of the head 18 into the engagement hole 12 or 12 is hung between the two, and a knob 20 is attached to the outer end of the engagement pin 17.

In the present invention, when gripping a large diameter object a with the chuck claw piece 13, the engaging pin 17 is moved to the engaging hole 1 near the center of the movable piece 11 by the elasticity of the spring 19 as shown in FIG. When switching to gripping an object a' with a small diameter, pull the engaging pin 17 against the elastic force of the spring 19 using the knob 20, and then push the engaging pin 17 through the aforementioned chuck pawl guide groove 4. The handle part 14 of the chuck claw piece 13 that is exposed on the outside is moved inward in the radial direction, and the engaging pin 17 is fitted and connected to the engaging hole 12 far from the center as shown in FIGS. 1 and 5. At the time of this switching, the handle member 7 and the scroll structural member 1 are not rotated.

(Function) In the present invention, only the chuck claw piece 13 is moved radially outward or inward on the movable piece 11, and during the movement, a plurality of engaging pins 17 are provided in the radial movement direction of the movable piece 11. Select one of the engagement holes 12, 12 and perform the fitting engagement.

(Effects) In the present invention, the movable piece 11 that engages with the scroll of the scroll structural member 1 and the chuck claw piece 13 that moves in the radial direction are separably overlapped, and the movable piece 11
A configuration in which several engaging holes 12, 12 are provided in the radial direction, and an engaging pin 17 is provided in the chuck claw piece 13 to select and engage one of the several engaging holes 12, 12. Since only the chuck claw piece 13 is moved in the radial direction to select and connect one of the plurality of engagement holes 12 in the moving direction of the moving piece 11, the handle member 7 and the scroll structural member 1 The operating length of the chuck claw piece 13 can be varied without rotating the movable piece 11 while keeping it stationary, and is useful when changing from a large diameter object to a narrow diameter object, or vice versa. In some cases, only the chuck claw piece 13 is moved, and there is no need to rotate the handle member 7, which is troublesome in operation.

[Brief explanation of the drawing]

The attached drawings show embodiments of the present invention.
The figure is a partially cutaway front view of the scroll chuck, the second
The figure is a side view partially cut along the line A-A in FIG. 1, FIG. 3 is a sectional view taken along the line B-B in FIG. 1, and FIG. 4 is a perspective view of the movable piece 11 and the chuck claw piece 13. , 5th
The figure is a longitudinal sectional view of a mode in which the chuck claw piece 13 has been moved in order to accommodate the object a' having a small diameter. DESCRIPTION OF SYMBOLS 1...Scroll structural material, 2...Circular chuck body, 4...Chuck claw piece guide groove, 7...Handle member, 11...Moveable piece, 12...Engagement hole, 13
...Chuck claw piece, 17...Engagement pin, 14...
Handle.

Claims (1)

[Scope of claim for utility model registration] Handle member 7 that constitutes the outer periphery of the chuck body
The scroll structural member 1 is rotated in conjunction with the scroll structural member 1, and the plurality of movable pieces 11 and chuck claw pieces 13 that engage with the scroll structural member 1 are moved radially inward to grip a pipe, round bar, etc. In the scroll chuck that is released by moving outward in the direction, the entire chuck claw pieces that move in the radial direction together with the moving pieces 11 are separably overlapped in the rotational direction of the scroll structural member 1, and each of the moving pieces 11 has a radial Several engaging holes 12, 12 are provided in the direction, and an engaging pin 17 is inserted into the chuck claw piece 13 by selecting one of the several engaging holes 12, 12. A scroll chuck characterized in that the scroll chuck is provided by winding the engaging pin 17, and the knob 20 of the engaging pin 17 is attached to the outer surface.