US3898011A

US3898011A - Wire grip

Info

Publication number: US3898011A
Application number: US474497A
Authority: US
Inventors: Wayne A Linquist; Earnest Y Seborg
Original assignee: Greenlee Tools Inc
Current assignee: Greenlee Tools Inc
Priority date: 1974-05-30
Filing date: 1974-05-30
Publication date: 1975-08-05
Anticipated expiration: 1992-08-05

Abstract

A wire grip which easily and quickly secures several wires for pulling through a conduit.

Description

United States Patent Linquist et al. 1 Aug. 5, 1975 [54] WIRE GRIP 1.1 14,637 10/1914 Nolan 1. 254/1343 Fl" 1,455.87) 5/1923 Gronlundm. .1 24/115 H 1751 lnvemorsl Wayne Lmquls" Eames 1.8021157 4/1931 Kellems 1 254/1343 FT 151 bolh of Rockford 2,650.400 9/1953 Kellems 1. 24/115 H Assigneez Greenlee Tool p y, Rockford, 1166.810 1/1965 Ensley 1 4 1 1 v 4 403/177 111. FOREIGN PATENTS OR APPLICATIONS 1221 Flled: May 1.105779 7/1955 France 294/78 R 211 Appl. No.: 474.497

Primary ExuminerAndrew V. Kundrat [52] U.S. Cl 403/212; 24/] 15 H Attorney, Agent, or Firm-James H. Bower [51] Int. Cl. FIGG 11/00 [58] Field of Search 403/177, 212, 215, 210, 403/211, 209. 24/115 H, 115 11,1226;

254/1343 FT; 294/74. 78 R [57] ABSTRACT A wire grip which easily and quickly secures several 1561 References C'ted wires for pulling through a conduit.

UNITED STATES PATENTS 357.728 2/1887 Munsing 24/115 R 3 Claims. 7 Drawing Figures PATENTEU AUG 5 I975 SHEET PATENTEU 5|975 P8981111 SHEET WIRE GRIP BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device which comprises sections of wire rope which are staggered so that individual wire grips are correspondingly staggered thereby allowing the device to fit smaller conduit.

2. Description of the Prior Art Although U.S. Pat. No. l,l l4,637 shows the manner of arranging the strands of wire to form individual grips, and U.S. Pat. No. l,802,657 shows two groups of strands subdivided into branches, those of one branch being returned upon those of another branch to form a loop, none relate to the idea of staggering axially the individual grips so that the grips fit into a smaller conduit. thereby not requiring different sizes of wire grips as disclosed in U.S. Pat. No. 3,166,810.

SUMMARY OF THE INVENTION This invention relates to a wire grip comprising two lengths of wire rope which are axially staggered so that individual wire grips secured to each of the wire rope is correspondingly axially staggered providing use of the wire grip therefor in smaller conduit.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I shows the wire grip with the wire rope axially staggered to provide a staggering of each individual wire grip.

FIG. 2 shows a side view of FIG. 1 with individual wire grips axially staggered.

FIGv 3 shows the loop end view of the two wire ropes showing a smaller diameter of the wire grips overall.

FIG. 4 shows an end elevation of the grip end.

FIG. 5 shows a sectional view of how the wire grip pulls all sizes of conductors through a conduit.

FIG. 6 is a cross-section view of a conductor wire held in a wire grip by opposed set screws.

FIG. 7 shows a single wire grip.

DESCRIPTION OF THE PREFERRED EMBODIMENT The reference numeral 10 indicates a wire grip embodying this invention for drawing electric power cable or wire through conduit. The wire may be of any type having core wire strands or multiple wire strands such as shown in FIG. I and FIG. 6 as element 20.

As illustrated in FIG. I and FIG. 2, the wire grip 10 comprises two

individual wire ropes

30, 40, of equal length which are axially staggered so that the wire rope includes grips l and 4 and wire rope includes

grips

2 and 3. However, it is well within the purview of one skilled in the arts that the lengths of the wire rope need not be equal in length, but of varying length. That is, the lengths of the individual wire ropes can be of different lengths so long as the wire grips are axially staggered with respect to each other.

The manner of normally securing the grips are by compressing or crimping the smaller neck of the grip over the end of the wire ropes and shown in FIG. I, FIG. 2 and FIG. 6 as 12.

As illustrated in FIG. 1, FIG. 2, and FIG. 5, each of crimped over the wire rope to form a loop portion 16. This double loop portion is used with a pull rope so that the wire grip can be pulled through a conduit, as shown in FIG. 5.

As illustrated in FIG. 6, each grip secured to the end of a wire rope comprises threaded bores 19 extending transversely through the body. .Iam screws 18 are threaded therein through the body by any means, however. normally an allen wrench will fit the recess 2| of the jam screw 18 and move the jam screw l8 into threaded engagement with the bore I9, and thus secure the wire 20 inserted into the bore 22 throughout the entire length of each grip. The jam screw I8 is forced against the wire 20 deforming it and causing it to bend and partially enter the opposite end of threaded bore 19. The threaded bores 19 extend at right angles to respective planes containing the body cylindrical axis 25 of each grip and along the side walls to provide positive thread engagement for the jam screw 18. This feature also provides for reversing the jam screw when the threads on one side of the bore are damaged.

This invention is primarily directed to a plurality of wire grips which are axially staggered so that the wire grip passes over sheaves, and through elbows in conduit more easier than any previously known method or apparatus. FIG. 3 and FIG. 4 shows that by axially staggering each grip an overall smaller diameter is obtained thereby allowing the wire grip 10 through smaller conduit as shown in FIG. 5.

It is understood that while one example of this invention is illustrated and described, it is not to be limited to the specific form or arrangement of parts herein described and shown insofar as such limitations are included in the claims. For example, FIG. 7 shows an individual wire grip l' with a wire loop portion 52 comprised of two

individual wire ropes

54 and 56 crimped by a collar 12'. However, a single wire rope can be used in lieu of the double wire rope. The wire grip consists of ajam screw I8 threaded into bore 19 as in the previous embodiment.

What is claimed is:

l. A wire grip for drawing multiple strand wire through a conduit comprising:

a. a pair of wire ropes reversely bent and secured together to form a double loop portion at one end;

b. wire grip means secured to each end of each of said pair of wire ropes, and

c. said grip means axially staggered to provide a smaller diameter thereby allowing said wire grip through said conduit.

2. The wire grip as set forth in claim 1 wherein each of said grips comprises:

a. threaded bore means extending transversely into the body of said grip; and

b. jam screw means threaded into said threaded bore means for securing stranded wire.

3. The method of providing a wire grip comprising the steps of:

a. securing gripping means at each end of two equal lengths of wire rope;

b. bending each of the wire ropes to form a loop portion at one end and axially staggered ends provid' ing axially staggered gripping means at the other end;

c. securing a collar intermediate each of said loop portions to provide a single double loop portion at one end and a free gripping means end portion at 3 4 the other end. said loop portions of each wire rope formation. while the gripping means of the other being equal lengihi wire rope comprise the middle portion of said lind. the gripping means secured to each end of said wire rope being axially staggered to provide a linear displacement formation; and

e. the gripping means of one wire rope being at the formationextreme end portions of said linear displacement car displacement formation and are between said extreme end portions in said linear displacement

Claims

1. A wire grip for drawing multiple strand wire through a conduit comprising: a. a pair of wire ropes reversely bent and secured together to form a double loop portion at one end; b. wire grip means secured to each end of each of said pair of wire ropes, and c. said grip means axially staggered to provide a smaller diameter thereby allowing said wire grip through said conduit.

2. The wire grip as set forth in claim 1 wherein each of said grips comprises: a. threaded bore means extending transversely into the body of said grip; and b. jam screw means threaded into said threaded bore means for securing stranded wire.

3. The method of providing a wire grip comprising the steps of: a. securing gripping means at each end of two equal lengths of wire rope; b. bending each of the wire ropes to form a loop portion at one end and axially staggered ends providing axially staggered gripping means at the other end; c. securing a collar intermediate each of said loop portions to provide a single double loop portion at one end and a free gripping means end portion at the other end, said loop portions of each wire rope being equal in length; d. the gripping means secured to each end of said wire rope being axially staggered to provide a linear displacement formation; and e. the gripping means of one wire rope being at the extreme end portions of said linear displacement formation, while the gripping means of the other wire rope comprise the middle portion of said linear displacement formation and are between said extreme end portions in said linear displacement formation.