Tangential thread rolling head

Details Tangential thread rolling head Tangential thread rolling head

1999-02-03

2001-03-20

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S108000

Reexamination Certificate

active

06202461

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to thread roll attachments for screw thread machines and the like, and more particularly to an improved thread rolling head or attachment which carries two thread rolls, and which is substantially easier to set up and adjust than prior such attachments. Even more particularly, this invention is related to an improved such attachment which is particularly suited for use as a tangential thread roll attachment.
A thread rolling attachment somewhat similar to that disclosed herein is disclosed in U.S. Pat. No. 4,617,816, which is owned by the Assignee of this patent application. For example, the above-noted patent discloses an attachment including a pair of arms that are pivotally mounted intermediate their ends on a yoke, so that two thread rolls, which are supported on the arms can be forced radially into rolling engagement with opposite sides of a piece of rotating bar stock in order to form threads on the stock. The arms are actuated by a wedge element which is manipulated by a fluid pressure operated piston. Although such prior art mechanism is suitable for introducing the thread rolls radially into diametrally opposite sides of the rotating bar stock, it has been found to be most desirable to provide a more accurate and easier means of manipulating the wedge element prior to engagement of the thread rollers with the rotating bar stock. Moreover this accuracy is particularly important in mechanisms of the type which utilize tangential engagement of the thread rolls with the bar stock.
Accordingly, it is an object of this invention to provide an improved, rather inexpensive and compact means for manipulating a wedge element of the type that is employed for accurately positioning the threading rolls of a threading roll attachment.
Still another object of this invention is to provide an improved thread rolling head of the type described in which the associated threading roll adjusting mechanism can be easily and readily manipulated manually by an operator to provide very accurate spacing between the threading rolls prior to engagement thereof with the associated workpiece.
A still further object of this invention is to provide an improved thread rolling head which is mounted on means for effecting tangential engagement of the threading rolls with the work that is to be threaded.
Other objects of the invention will be apparent hereinafter from the specification and from the recital of the appended claims, particularly when read in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
The thread rolling head includes a generally yoke-shaped bracket having a closed end from which projects a pair of spaced, parallel bracket arms between which extend a pair of spaced, parallel fulcrum or pivot pins Pivotally mounted intermediate their ends on the fulcrum pins are two thread roll supporting arms which project at their forward ends beyond the forward ends of the bracket arms, and at their opposite ends toward the closed end of the bracket. Mounted in registering recesses in the forward ends of the roll supporting arms to rotate in spaced relation about axes that extend generally parallel to the fulcrum pins are two conventional thread rolls. At their opposite ends the thread roll supporting arms have rotatably mounted thereon a pair of roller followers, which are urged by springs into rolling engagement with a pair of inclined, opposed surfaces formed on the forward end of a wedge that projects between the roller followers. The wedge is pivoted at its rear end to a pin which is threadably connected to the forward end of an adjusting screw, the rear end of which is secured to a knurled adjusting knob that is rotatably mounted on the closed end of the bracket.
The bracket is supported on a slide which operates to reciprocate the bracket to and from an operative position selectively to engage the threading rolls tangentially with diametrally opposite sides of the rotating workpiece that is to be threaded. Before advancing the threading rolls into engagement with the work the adjusting knob is rotated accurately to set the desired space separating the threading rolls. Also if necessary the knob can be rotated to adjust the threading rolls even when in their operative positions without having to shut down the associated machine.


REFERENCES:
patent: 3184003 (1965-05-01), Kershner
patent: 4426869 (1984-01-01), Farmer et al.

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