JPS58223521A - Screw repairing tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Misfire F3A relates to the repair of damaged threads in threaded members such as bolts, studs, etc., and in particular to tool assemblies for performing this repair.

While the present invention is fundamentally applicable to repairing damaged threads in studs, bolts, etc. of any size, it is particularly directed to repairing damaged threads in full length studs, bolts, etc.

During maintenance or repair of equipment or equipment that includes studs, bolts, etc. that bolt components together, terminal or tip threads are commonly susceptible to damage. One common example involves removing heavy truck wheels for tire fixing and repair.

Such wheels are mounted on studs and the threads, especially the end threads, are susceptible to damage during wheel removal.

Such studs are studs of sufficient length that they cannot be repaired by useful tools designed for short studs such as those found in passenger cars.

It is an object of the present invention to (1) provide a new and improved means for repairing damaged threads on studs, bolts, etc., and (2) provide a tool assembly that can be used to repair damaged threads on long studs, bolts, etc. (3) reforming the material of the damaged screw essentially back to its original screw shape;
The present invention provides a new and improved means of repairing damaged threads of studs, bolts, etc. by remolding.

Additional objects of the invention will become apparent from the following description of a preferred embodiment of the invention with reference to the accompanying drawings.

According to the figures showing details of a preferred form, the invention comprises a pair of fully complementary screws ((・(complem
1.3 and, when assembled, this assembled relationship is maintained by a socket 7 which is a slip fit over the assembled half-nut part.

The half-nut portion assembled with the socket is interlocked to prevent relative rotation, and the means formed to prevent relative rotation are responsive to the application of a downwardly applied force to the member to be treated. Flang the no-7 nut so that it is in pressure engagement with the nut. When such downward pressure is applied at the same time as the socket is rotated, the assembled nine-head nut is unscrewed along with the parts to be treated as a unit, repairing any damaged threads in the process. .

Each virtual half nut has an internal thread 9 that is complementary to the corresponding threads of the other 71-f nuts, so that when the two 71-f nuts are assembled they form a thread helix. Each nut portion is slightly smaller than a semicircle so as to be capable of pressure engagement with the stud that is assembled around the stud. The semi-cylindrical outer wall 11 of the nut part forms a cylindrical outer surface adapted for the assembled nut part to be surrounded by the socket. It has a generally cylindrical inner wall 13 of a diameter suitable for holding.

In order to prevent relative rotation between the socket and the nut part to be assembled, a flat inclined surface 1 interrupting the approximately arc-shaped side wall surface along the middle part of one or both of the nut parts I7
5, while the socket is provided with a pin 17 along each diametrically opposed arc, the pin being adapted to engage said flat ramp when the socket is assembled onto the nut part. used for.

At the proximal end of the socket, the nut section shall be fitted (processed) when the stud or bolt is of sufficient length to pass through the proximal end of the socket when assembled around the stud or bolt to be processed. A central hole or opening 19 is provided that is large enough to freely pass the end of a stud or bolt.

In order to facilitate turning the socket when assembled around the part to be treated in this way, the proximal end is formed in a polygonal shape, such as a hexagon 2, so that a wrench can be used. By applying pressure on the socket such that the wrench is turned in a direction that unthreads the assembled nut along the member to be processed, the nut is maintained in a flanged position relative to the member to be processed; Along with the part to be processed, the nut part is unscrewed, where any damaged threads are repaired during the course of rotation of the nut part.

By using the polygonal end of the socket in this manner, one end opening 9 is open to allow free passage of a stud or bolt, even if it is long enough to be pushed back. The trap is sufficiently short so that studs etc. do not extend into said opening, and the opening 9 is polygonal in shape to accommodate the end of the speed handle for turning the socket and the nut portion contained in the socket trap. can do.

An additional feature of the invention is that the die receiving end of the socket is
As shown in the figure, the cross section is formed into a slightly oval shape, and the maximum diameter part is a chord pin 17.
It consists in compressing it slightly so that it is interrupted at.

Along the minor diameter, the socket has some amount of elastic deflection. This allows a snug or tight fit of the socket at the short diameter end to the nut, while the string pin will conform closely to the slope of the nut when under pressure. , thus ensuring a tight grip of the nut part by the socket in use, where the socket has a loose cylindrical shape relative to the assembled nut part, thereby preventing the socket from forming otherwise.
/"t Avoid looseness. Such looseness requires very little force when turning the socket and nut to obtain the effect of repairing the screw.

The threads of the nut can be formed according to the practice of the prior art, such as cutting one threads, i.e. cutting perpendicular to the arc of the stud or bolt being processed, leading in turns or ending in each lead turn. Then, as the assembled nut advances, it cuts into the material of the damaged thread to form a spiral valley across the damaged thread to allow use of the nut.

The thread becomes very distorted in shape when severely damaged, so when cutting a helical valley to enable the use of a nut, quite often the thread obtained is very lacking in material and partially It has been found that the possibility of thinning and lack of height with irregular surface contours is quite frequent. When used for this purpose, the nut becomes a loose fit and tends to rattle, during which time it leaves its course and starts cutting its own new threads, eventually cutting off the original threads that were previously undamaged. .

This problem can be solved in a very simple but still not obvious way by using one central groove 25 and one or more angular grooves 25.
u jar ly) in each nut part, with walled grooves 27, 29, etc. on one side of the central groove and a corresponding number of angular walled grooves 30, 31, etc. on the other side of the central groove. The problem is solved by forming an incision across the thread and having an angular wall groove on one side relative to the central groove, preferably mirror-shaped in the other groove.

Considering the part with grooves 27 and 29 in relation to the central groove 25 of each nut part, such part is adopted for use in repairing damaged right-hand threads when turned counterclockwise;
With this in mind, the grooves 27 and 29 create a plurality of threaded segments 31, 33, each threaded segment having a lead angle 4] with respect to the normal to the stud or bolt being worked on.
, 43, each lead edge terminating in a free corner 45 and reaching the bottom of a predetermined valley between the threads of the stud or bolt to be worked on.

In this way a slight cutting effect can occur.

What happens is that the beveled advance edge of each thread segment acts for the most part, compressing any damaged thread material that may be in its path and spreading the excess material into the approximate valley of the nut. and replace the material of the damaged screw with a new screw Vc′Ii.
4. To correct or reform. The nut portion is then part of a straightening or reshaping die, which distinguishes it from prior art thread cutting means. As the advance of the thread segment or the lead angle of the lead edge increases, the cutting action decreases and in most cases is constrained to a re-formed thread trough.

The resulting difference to ordinary cutting die screws lies in the fact that a minimal amount of screw material is removed by straightening or reforming the material of the damaged screw. Many parts are reused to straighten or reshape new threads. The resulting thread approaches the original thread very approximately as it did before it was damaged, and when used on such a re-formed thread the nut does not rattle and the stud or bolt is lowered even lower than the original thread. There is no risk of cutting into the thread.

The lead angles 41, 43, etc. are not critical, and the lead angles are necessarily not the same. After a prolonged period of experimentation, it was found that by using successive lead angles of different values, as well as by assuming an intermediate value of the lead angle, a more complete result was achieved without any effect. Thus, in the preferred embodiment as shown in FIG. 7, the initial lead angle formed by groove 27 is on the order of 35 degrees, so the lead angle formed by 1111291c is on the order of 60 degrees. Regarding the die screw segment,
Lead edge 35 makes an angle on the order of 125 degrees with segment 31, while lead edge 37 makes an angle with segment 3
Create an angle on the order of 3 and 150 degrees.

As a result of lengthy experiments, additional improvements have been made, both in the reduction of the rotational effects required in the process of repairing the damaged screw and in the accuracy of the final result: (1) Groove 27.
By bevelling the inside corner of each nut section to interrupt the wall just in front of each of 32, creating a very shallow lead edge 49.51 that ends without reaching the threaded trough of the stud or nut being repaired therein. and (2
) This is achieved by forming a central valley 25 with outwardly sloping side walls, each forming an angle 55 of the order of only 5 degrees with the normal.

A shallow leading edge 49, formed by diagonally cutting the inner corner just before the nut section, acts to partially push down the material in its passageway before the lead edge 35 reaches such material, where it This eliminates the lead edge 35 of the load and reduces the otherwise required rotational force.

The lead edge 59 formed by the central groove 25, which extends at a very small angle to the normal, is formed by the lead edges 49, 35, 37 as soon as the central ♦ advances when acting as a 9-in-1 dodge.

This results in an angled cut that forms the thread trough, thus being effective as a cleaning action and favorably shaping the reshaped thread trough.

It is thus understood that each nut portion is a mirror image of what is present on one side of the central groove and prevails on the other side.
,-.

When using a complementary nut part for the intended purpose of repairing a damaged thread, such as a stud, the nut part is hand-assembled onto the unthreaded part of the stud or nut, and this necessarily This is the part that is removed from the free end of the stud. With this subsequent assembly, the socket is used over the resulting straightening or reshaping die, and the die is then turned counterclockwise for a right-handed stud so that the die along the stud does not thread. Upon reaching the damaged thread, the die begins to reform the damaged thread, while the die section is guided by the good thread of the initially installed stud.

At the point where the die is fully traversed through the damaged threads, the die is withdrawn and the die is unscrewed completely from the stud.The die is then screwed back towards its starting point, in the process causing the mirror image of each nut section to be reattached to the stud. It can act to remove traces remaining in the formed threaded portion. The groove thus forms a space for storing excess material removed from the threads of the stud, as well as material that is present during the interposition process.

Figures 8 and 9 illustrate how the thread configuration may be employed in a thread repair tool employed for use in reshaping damaged threads in short long studs, bolts, etc.

Two nut sections are assembled around the stud 64, although as in the previous embodiment of the invention there are two nut sections 59,61. The nut portions differ in that each nut portion has an inclined outer wall surface 63, for example with a truncated pyramid and preferably with a base 65. When the nut parts are assembled around a stud or bolt, they do not touch each other, but there is a slight gap between them,
This allows radial pressure to be applied to the nut portion to force the damaged thread into pressure engagement with the threaded stud or bolt to be re-formed.

Thus, when assembled around such studs, etc., 1. Use of a suitably sized socket wrench 67 can accommodate the resulting beveled surface of the die and simultaneously apply pressure and rotational moment to the die to prevent the die from being threaded above the damaged threads, while The section is maintained in pressure engagement with a stud or the like to reshape the thread from damaged thread material. As in the previous embodiment the die can be screwed back down the stud for any cleaning effect that may be required.

From the detailed description of the preferred form of the invention, it is clear that the same can be modified without departing from the basic principles involved, except as may therefore be forced by the embodiment section. It is not desired that the protection of the present application be limited to the specific details shown and described.

[Brief explanation of drawings]

1 is an exploded view of a preferred embodiment of the invention used for repairing long studs or bolts; FIG. 2 is a longitudinal cross-sectional view of the socket of FIG. 1 with a straightening or shaping die incorporated therein; 3 is a sectional view taken along plane 3-3 of FIG. 2, FIG. 4 is a plan view of the proximal end of the socket in FIG. 2, and FIG.
2 and 3 are elevational views of the outside or side walls of two half-nut parts with flat inclined surfaces of the straightening or forming dies that have been modified in an elaborate manner, and FIG. 6 is a view showing a modification of FIG. 3. , FIG. 7 shows the shape of the thread of a straightening or forming die included in the invention, and FIG. 8 shows a straightening or forming die modified to fit a standard socket wrench and used to repair damaged threads such as short studs. FIG. 9 is a cross-sectional view of the die of FIG. 8 for use with a conventional type socket wrench. 1.3...Half nut part 5...Screw member 7...
・Socket 9...Inner screw 11...Outer wall surface 5...Flat inclined surface 17...Pin
25...Central groove 21.27, 29, 3.2.
...Groove 31.33...Thread segment 35.37...
・Lead edge 41.43...Lead angle 49.51
... Lead Edge 59.61 ... Natsuto Department Agent
Patent attorney Hideaki Kuwahara

Claims (10)

[Claims] (1) Complementary internal threads designed to create a spiral thread sound when assembled around studs having the same number of threads per inch and approximately the same cylindrical outer wall surface when assembled. When assembled around a stud, one end is fitted onto the nut part and the other end is a socket having an opening, the opening of which allows the stud to A socket that is formed so that the stud passes through it when it is long enough to extend through the opening during initial processing, and an assembly of the socket when the socket is used in an assembled nut. means for inhibiting relative rotation of the assembled nut part t-with respect to the stud and for clamping the assembled nut part t-the assembled nut part t-while rotating as one unit in the direction of withdrawal along the stud; means for simultaneously applying pressure and rotational force to said socket. (2) a flat sloping surface interrupting at least one generally arcuate outer surface of the nut portion; and a flat slanted surface extending completely through the socket along the chord of the socket and when the socket is slidably fitted onto the nut portion assembly; Claim 1, characterized in that said means for preventing relative rotation of said socket with respect to said assembled cut includes a pin engaging an inclined surface.
1), the screw repair tool described in section 1). (3) An end opening is provided to allow the passage of a long stud, etc. to be processed, and includes a flat face metal diametrically opposed to the surface of said socket for the use of a wrench to make the entire rotation effective. , Means 1 that makes it possible to apply rotational force to the socket after attaching the socket to the assembly of the nut part 1 *
The screw repair tool according to claim 1, which is a ridge. (4) a flat sloping surface interrupting each generally arcuate outer surface of said nut portion and extending respectively through the socket along the chord of the socket and separate when the socket is slidably fitted onto the nut portion assembly; A pair of pins that engage the flat inclined surface of ? ] l-% fine. (5) The screw repair tool according to claim 3, wherein the diametrically opposed flat surfaces are formed by hexagonal end pressure of the socket. (6) Hold all threaded segments, each threaded segment with its leading or advanced edge forming a lead angle normal to the stud or bolt being processed, and remove any damaged threaded material during its travel. A splint repair tool according to claim 1 of the scope of Patent D Seishui, characterized by each nut portion being reshaped into a thread. (7) Complementary internal threads designed to form a full helical thread when assembled around a stud having the same number of threads per inch and a substantially cylindrical external wall surface when assembled. a plurality of nut portions having generally arcuate outer surfaces forming a socket, one end of which is slidably fitted onto the nut portion when assembled around a stud; and when the socket is used with the assembled nut portion. The means for inhibiting relative rotation of the socket with respect to the assembled nut section includes a flat inclined surface formed on at least one of the nut sections, which interrupts the arcuate outer surface of the nut section, and a flat inclined surface along the chord of the socket. means having a pin that engages with the flat inclined surface when the socket is smoothly fitted onto the nut part when assembled to a turntable such as a socket gold medal through stud; means for simultaneously applying pressure and rotational force to said socket so as to clamp all of the assembled nut parts against the stud while rotating said assembled nut parts as one unit; A screw repair tool for repairing damaged screws such as studs. (8) Having a threaded segment, each segment has a leading or advancing edge that forms a normal to the stud or bolt to be processed, and presses damaged threaded material in its path to form a thread. 4 on each nut to reshape the material. Characteristic feature δ′ “The screw repair tool according to claim 7. (9) When assembled around a stud, bolt, etc. to be worked on, it includes a plurality of threaded nut sections with complementary threads forming a helical pattern, each of the threads of each nut section being processed. The lead edge advances or leads at an angle normal to the stud, etc. to be treated, and terminates at the free end of the lead edge, so that when the nut part is assembled around the stud, etc. to be treated, said lead edge is free from damaged threads in its passage. A screw repair tool that applies full pressure to the screw square shape on the material. (10) a threaded part of the NAND portion has a central groove which is cut out; and at least one angular wall groove in either of the central grooves, one of the grooves being a mirror image of the other; When the screw rotates in one direction, a square lead edge is cut into the segment with a segment to one side of the central groove;
Each nut part t- has an angular lead edge when the segment of the central groove on the other hand...1j rotates in the opposite direction.
A screw repair tool according to claim 9. (1) J pairs of threaded segments are formed on either side of the central groove, and the segment furthest from the central groove is the one for the stand, etc. to be processed. The leads forming an angle with the normal are on the order of 35 degrees, while the segments closer to the central groove form an angle with the normal of the order of 60 degrees.
1103A. The thread repair tool of claim 1103A, characterized on a pair of grooves having a 7-edge. (Revised Scope of Claim 11.V) The splinter repair tool according to the present invention, in which *a represents the central groove having a wall forming an angle of the order of 5 degrees with respect to the normal line of 1.