US1603618A - Lock nut - Google Patents

Description

Ow. w, w26. 1,603,618'

B. S. MCCLELLAN LOCK NUT Filed August 29, 1922 Patented Oct. 19, 1926.

UNITED STATES 1,603,618 PATENT OFFICE. i

BENJAMIN S. MCCLELLAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO GRIP NUT COMPANY, F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOCK NUT.

Appiicationiiiea mgm ze, 1922. serial No. 585,031.

This invention relates to locli nuts. One object of my invention is to. deflect a portion of a number of the threads of the nut into the bore and longitudinally thereof and to increase the frictional resistance to y turning the nut od a bolt and thus lock it on, by providing the deflected thread portions with abrupt ends inclined to resistthe reverse turn and exert a sort of cam action at that time.

Another object of my invention is` to so incline these abrupt ends and deflect the threads that no material resistance is offered to turning the nut on a bolt.

A further object of my invention is to accomplish this deflection and abrupt ends by punching a singley notch into the nut body adjacent its bore and displacing by bending inward and downward a portion of the nut body between the notch and bore.

The invention consists further in the matters hereinafter described and more particularly set forth in the annexed claims.

In the accompanying drawings--` Fig. 1 is a perspective view of a lock nut made in accordance with my invention;

Fig. 2 isa top plan view ofsaid nut;

Fig. 3 is an enlarged vertical sectional View taken on line 3-3 of Fig. 2; p

Fig. 4 is an enlarged similar sectional view taken on line 4 4 of Fig. 2, with the nut shown started on a bolt; and

Fig. 5 is a similar View with the nut completely turned on the bolt and locked in accordance with my invention.

To accomplish the objects of my invention, I take a nut .1 of a standard size with screw threadsV 2 of a uniform diameter and pitch throughout the length of the bore 3.

With a punch or other tool 4, as shown in Fig. 4, I cut a single notch 5 in the metal body of the nut through its outer face 6', adjacent the Aedge of the bore 3 and at one place ,inv the circumference thereof. The punch 4 is so made that the notch 5 is sha ed as follows:

he bottom edge 7 is curved in an are of a circle concentric tothat of the bore 3, as shown in Fig. 2, and is inclined upward from the deepest point at one end of the notch to the shallowest point at the other end, as shown in Fig. 3. The notch at its deepest end has an rupwardl extending straight edge 8 inclined inwar toward the bore 3, as shown in Fig. 2.

The inner and'outer walls 9, 1() of said notch diverge upward from said bottom edge 7 and are thus inclined on opposite sides of said bottom edge, the inner wall 10 being inclined toward said bore 3. These G0 walls 9 and 10 are also curved eccentric to the bore 3, as indicated by their outer edges 1n the outer face 6 of said nut. The inner wall 1 0 curves inward toward the bore 3 and ends 1n the edge 8. The outer wall 9 has 65' a greater curvature and terminates with a sharp refentrant curve extending toward the bore 3 to reach the edge 8.

The notch 5 so made is. somewhat wedge shaped and has its widest Iend nearest the bore 3. In punchin the notch adjacent the bore 3, the metal of t e nut body between the notch and the bore is displaced and forced into the bore and also downward toward the lower end thereof. This dellects the upper 7.5 threads 11, 11 into the bore and downward. By having the widest andV deepest end of the notch directed inward, the deflected thread portions terminated in abrupt ends 12, 12 aligned lengthwise of the bore and 80 inclined 4in the direction trailing the nut p on the bolt 13, the latter being shown in Figs. 4 and 5.

he approximate amount of inward deflection is'indicated in Fig. 4 by the dotted 95" lines a, b, the former being parallel with the threads before deflection andthe latter after.v The deflected thread portions 11 as they approach the abrupt ends 12, 12 have a gradual inward and downward deflection, as shown. This is due to the notch 5 having its shallowest' end farthest away from the bore 3 and gradually widening toward the bore. The abrupt ends 12, 12V constitute in y effect shoulders to resist any reverseturn of the nut and bolt relative to each other.

The nut 1 takes easily on the bolt 13 because `the threads 2 at the entrance of the bore 3 remain undisturbed and have the same diameter and pitch as the undeflected 10" .portions of said deflected threads 11,11.

The nut 1 is guided on the bolt 13 like an .ordinary nut. No locking takes place while the nut is turned on the bolt 13 because the deflected thread portions 11, 11 tend to 105 straighten out and offer no material resistance to the forward turning of the nut. This is due to the shoulders or ends 12 being inclined in the direction of this turn. Turning the nut 1 backward, however, causes the 110 The deflected threads shoulders 12 and deected portions 11, 11 to immediately have cam e'ect and lock the nut on the bolt by crowding the metal of the said portions 11 into the spaces between the engaged ybolt threads. This frictonal resistance is increased as the leverage `on the nut to back it off the bolt is cause the abrupt shoulders 12 and deflected portions 11 increase in their cam action. of the nut bring all of the thread surfaces of the nut and bolt in the plane ofisaid deflected threads into tight contactall around except in that portion immediately following the abrupt ends 15 or shoulders 12 of s'aid deflected threads.

This provides cavities or spaces between the thread surface and allows the metal burs on these surfaces tol interlock and pack and give a die action to resist the turning of the 2t)v nut off the bolt.

A nut made in accordance with my invention does not lock itself on 'the bolt while being turned on the bolt but is always ready to lock as soon as it is given the reverse or backward turn, thus allowing the nut to adapted for use lock at any point on the bolt. This locking increases as the tendency to back the nut off increases and thus provides a sure and ositive'lock. The nut therefore is' particu arly where excessive and great vibration is had as on railroad cars and equipment of that general nature.

'le I have shown and described herein in detail a lock nut of my invention, it is of course understood that the details of construction may be variously changed and modified without departing from the spirit and scope of my invention.

I claim as my invention:

1. A lock nut having screw threads in its bore, a portion of a number of said threads atv one place in the circumference of the bore being deflected into the bore and longitudinally thereof, said deected portions merging into the remaining portions of said threads gradually at one end and abruptly at the other end, the balance of the threads pitch as the undeilected portions of said delected threads.

2. A lock nut having screw threads in its bore, a portion of a number of said threads at one place in the circumference of the bore being deflected into the bore and longiv tudinally thereof, said deflected portions merging into'the remaining portions of said threads gradually at one end" and abruptly at the other end, said abrupt ends being in substantial yalignment lengthwise of the bore and inclined to resist turning the nut olf a bolt, the balance of the threads in the bore remaining the same in diameter and pitch as the undeflected portionsof said deflected threads.

f3. A lock nut, comprising a body portion increased be- 1n the bore being the same in diameter and vmoana having a bore with screw threads therein, and a wedge shaped notch punched into the metal of said body portion through one face of the nut and adjacent the edge of the bore for dellecting into the bore and toward the 'opposite face of the nut a portion of a number of threads at said notch by displacing in that direction the metal of the nut body between said notch and bore, said notch having vits widest end next to the bore for making the deflected thread portions at said notch merge abruptly and inclined into the remaining portions of said threads to resist turning thenut olf a bolt.

4. A lock nut, comprising a body portion having a bore with screw threads therein, and a notch punched into the metal of said body ortion through the outer face of the nut adjacent the edge of said bore for deflecting into the bore and toward the lower face of the nut a portion of a number of the threads at said notch by displacing in' that direction the metal of the nut body between the notch and bore, said notch having its bottom edge concentric to the bore andv one end relatively dee and enlarged to form in the deflected threads abrupt ends inclined to resist burning the nut off a bolt.

5. A lock nut, comprising a body portion having a bore with screw threads therein, and a notch punched into the metal of said body portion through the outer face'of the nut adjacent the edge of said bore for deflecting into the bore and toward the lower face of the nut a portion of a number of the threads at said notch by displacing in that direction the metal of the nut body between the notch and bore, said notch having its bottom edge concentric to the bore and one end relatively deep and enlarged to form in the deilected threads abrupt ends inclined to resist turning the nut off a bolt, said notch having its sides diverging outward from said bottom edge and curved eccentric to said bore and one to a greater extent than the other to increase Athe deflection of said threads toward the abrupt ends therein.

6. The combination of a bolt and a nut, said nut having a portion of a number of ,its threads at one end of its bore and at one place in the circumferencethereof:I deflected into the bore and toward the opposite end thereof, said deflected portions merging into the remaining portions of said threads gradually at one end and abruptly at the other end, said abrupt ends 'being in substantial alignment lengthwise of said bore and incllned to resist turning said nut-of the bolt by frictional contact with the threads of the bolt.

7. The combination of `a bolt and a nut, said nut comprising a body portion having a threaded bore therein and a notch punched in the outer face to form a depression exvtending concentric with the bore and ence' thereof, towar s the opposite end of,

the bore, the depression being tapered longitudinally so that it 'is of greater Width at one end than at the other, so that the deiected .portion of the threads merge into the remaining portions of said threads gradually at one end and abruptly at the other end, said abrupt. ends being in substantial alignment lengthwise' of said bore and inclinedto resist turning said nut oi the bolt by frictional contact with the threads of the bolt.

4In testimony that I claim the foregoing as my invention, I affix' my signature this 26th day Aof August, A. D. `1922.

BENJAMIN S. MCCLELLAN.

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