US3358545A

US3358545A - Clamping nut

Info

Publication number: US3358545A
Application number: US480689A
Authority: US
Inventors: Chester I Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-08-18
Filing date: 1965-08-18
Publication date: 1967-12-19
Anticipated expiration: 1984-12-19
Also published as: DE1684519A1; GB1160296A; BR6682112D0; DE1684519B2

Description

Dec. 19, 1967 c. I. WILLIAMS 3,358,545

CLAMPING NUT Filed Aug. 18, 1965 m/vfimbfi CHESTER WILLIAMS 7 United States Patent 3,358,545 CLAMPING NUT Chester I. Williams, 347 Greenbriar SE., Grand Rapids, Mich. 49506 Filed Aug. 18, 1965, Ser. No. 480,689 3 Claims. (Cl. 85-32) This invention relates to the construction of nuts that must be repeatedly unscrewed from the ends of bolts under conditions favoring the accumulation of foreign material on the bolt threads. The preferred form of the invention has been developed as a nut forming a component of a tie system for securing forms preparatory to pouring concrete. While the mass of the concrete is poured on the opposite side of the form from the clamping nut, the liquid concrete is often spilled about in a random fashion during the pouring process. Swinging overhead buckets of liquid concrete will often drip substantial quantities during the passage from the source to the point of deposit, and anything tending to jostle the bucket will aggravate the situation. Some of this material is bound to hit the ends of the securing bolts, and has adaquate time to harden in this position before the clamping nut is normally removed. This is only one source of possible accumulations of foreign material on the bolt. Rock particles, sand, and practically anything imaginable can easily find its way into the grooves formed by the bolt threads. Unscrewing the nut from a thread system that has been contaminated in this fashion can easily produce either a jamming action interfering with the removal of the nut, or an abrasive action that will progressively wear away the interengaged threading on the bolt and the nut.

This invention recognizes the inevitability of these conditions, and provides a conformation for the end of the nut which will serve to remove the accumulations of foreign material from the bolt threads as the nut is unscrewed. This arrangement makes it unnecessary for the nut to ride over the foreign particles, and thus reduces the amount of torque necessary to rotate the nut. The formation of the body of the nut is such as to conduct the foreign particles removed from the bolt threads away from the area adjacent to the bolt so that they do not become reembedded.

The several features of the invention will be analyzed in further detail through discussion of the particular embodiment illustrated in the accompanying drawing. In the drawing:

FIGURE 1 is a view showing the conventional securing of a form panel as a concrete structure is progressively developed, and showing the securing system of which the preferred form of the nut is a component.

FIGURE 2 is an enlarged section of the form tie system shown in FIGURE 1.

FIGURE 3 is an end view ofthe nut shown in FIG- URE 2.

FIGURE 4 is a sectional of the plane 4-4 of FIG- URE 3.

FIGURE 5 is a section of the plane 5-5 of FIG- URE 3.

FIGURE 6 is a section of the plane 6-6 of FIG- URE 3.

FIGURE 7 is a section of the plane 7-7 of FIGURE 6.

Referring to FIGURES 1 and 2, the form structure generally indicated at 10 is shown in the usual position of installation for progressively developing a concrete structure 11. During the successive pours of concrete, the anchor rods 12 are embedded in each pour to form securing points for the attachment of bolts as shown at 13. These traverse the form structure 10, and are secured by wing nuts 14 which usually bear against brackets as shown at 15, for adequate transfer of stresses over to the wood 3,358,545 Patented Dec. 19, 1967 structure of the form 10. After the concrete has set, the wing nuts 14 are unscrewed from the bolts'13. The projecting threaded end 16 of the bolt 13 forms an inviting place for the accumulation of small quantities of concrete intended for deposit to the right of the form structure 10, and the removal of these foreign particles without jamming the threads of the bolt-andnut is the purpose of the present invention. As the nut is unscrewed, these foreign particles tend to accumulate as shown at 17 in FIGURE 2. If not removed, these particles will tend to find their way between the bolt and the nut.

The nut 14 is preferably provided with

wings

18 and 19 which form diametrically opposite handles for tightening and loosening the nut. The inside surface of the nut is threaded as shown in 20, FIGURE 5, and the inner end of the nut 21 forms a bearing'surface normally engaging the bracket 15 for transfer of clamping forces. The opposite end of the body portion 22 of the nut is preferably provided with axially-extending portions as shown at 23 and 24 on opposite sides of the nut for defining a groove 25 for receiving a transverse locking-pin. The conformation is commonly known as castellated.

The thread system of the bolt and the nut may be single or multiple, and the number of threads constituting the thread system will determine the number of points of emergence of a thread from the outer end of the body portion 22. This invention is particularly concerned with the conformation of the surfaces of the body portion at the point of emergence of the one or more threads. The portion of the nut indicated at 26 in FIGURE 6 is in part defined by a face intersecting the surfaces forming the thread system of the nut, and is a part of the ridge on the nut extending into the corresponding groove between adjacent ridges of the bolt threading. This face extends across the interval between the adjacent thread ridges of the bolt, and forms a cleaning surface extending into this space. It is important that this face forms an acute angle with the crest and root surfaces of the threads such as, for example, the crests of .the threads indicated at 20 in FIGURE 7. This conformation produces the effect of a chisel extending down into the thread grooves of the bolt to progressively remove any foreign particles encountered as the nut is unscrewed. The rotation corresponding to unscrewing will normally be counterclockwise, as viewed in FIGURES 3 and 7. It is preferable that the adjacent portions of the surface defining the outer end of the body 22 of the nut are generally convex disposed in such a manner as to facilitate the flow of foreign particles away from the threaded area so that they can drop off, rather than become re-embedded.

The particular embodiments of the present invention which have been illustrated and discussed herein are for illustrative purposes only and are not to be considered as a limitation upon the scope of the appended claims. In these claims, it is my intent to claim the entire invention disclosed herein, except as I am limited by the prior art.

I claim:

1. A clamping nut for engaging a projecting threaded end of a bolt of a form-securing system, said nut comprising:

a body portion having a threaded inside surface, and a transverse bearing surface at one end of said body portion, the opposite end thereof having at least one portion having a face intersecting said threaded surface and extending between adjacent threads to form a cleaning surface extending into the space between adjacent thread portions on said bolt, said face forming an acute angle within the material of said nut, with the adjacent portion of said threaded inside surface pointing in the direction of movement of said nut at said face corresponding to loosening the same,

. 4 7 whereby foreign material is cleared from the thread References Cited end of said bolt as said nut is unscrewed. I UNITED STATES PATENTS 2. A nut as defined 1n claun 1, wherein said opposite 22 5 1 7 end has a plurality of peripherally spaced portions pro- O 4/ 880 Ibbotson et a1 85 32 vided with said faces, each of said portions being an axial 1339578 5/1920 9 85-42 extension of said body portion having a groove for a 1 2 5 3 locking pin.

3. A nut as defined in claim 1, wherein the surfaces ,7 v of said body portion adjacent to said face are convex and CARL r Pr'mary Exmmer disposed to conduct foreign particles away from said bolt 10 R. S. BRITTS, Assistant Examiner. as said nut is unscrewed.

Claims

1. A CLAMPING NUT FOR ENGAGING A PROJECTING THREADED END OF A BOLT OF A FORM-SECURING SYSTEM, SAID NUT COMPRISING: A BODY PORTION HAVING A THREADED INSIDE SURFACE, AND A TRANSVERSE BEARING SURFACE AT ONE END OF SAID BODY PORTION, THE OPPOSITE END THEREOF HAVING AT LEAST ONE PORTION HAVING A FACE INTERSECTING SAID THREADED SURFACE AND EXTENDING BETWEEN ADJACENT THREADS TO FORM A CLEANING SURFACE EXTENDING INTO THE SPACE BETWEEN ADJACENT THREAD PORTIONS ON SAID BOLT, SAID FACE FORMING AN ACUTE ANGLE WITHIN THE MATERIAL OF SAID NUT, WITH THE ADJACENT PORTION OF SAID THREADED INSIDE SURFACE POINTING IN THE DIRECTION OF MOVEMENT OF SAID NUT AT SAID FACE CORRESPONDING TO LOOSENING THE SAME, WHEREBY FOREIGN MATERIAL IS CLEARED FROM THE THREAD END OF SAID BOLT AS SAID NUT IS UNSCREWED.