CA1252984A - Wire stripper - Google Patents

Abstract

"IMPROVED WIRE STRIPPER"

ABSTRACT OF THE DISCLOSURE
The wire stripper comprises a first lever and all element secured thereto, defining a first jaw. A
body is articulated to the first lever and defines a second jaw, opposite to, and co-operating with the first jaw. The body being articulated to a second lever, mounted for a swinging movement relatively to the first lever by means of a pivot pin provided centrally within a circular lug, adapted to be received in a circular region of the second lever. The pivot being of composite construction including a bushing having a flange and an axial hole adapted for co-opera-tion with a screw.

Description

~;2~8 ~ his invention relates to an impro~ed wire stripper ~or removingthe end portion from an electric lead sheath.
Stripper~ of the above type ars already know~ on the market. O~e ~f th~m, forming the subject matter of a prior Utility Itlodel ~pplication by this Applicant9 comprises a first lever defining a handle and a ~ir~t jaw portion, whereto a contoured bo~
articulated which forms the seco~d jaw for cooperation 10 with said ~irst jaw in gripping an end of a cable ~o be ~tripped. Articulated to said body is a second le~er forming the ~ ~nd ~andle of the stripper and being mounted for a swinging movement relatively to the firsthandle ~g~Dst ~hebia~orce o~ a return ~pring.
Depressions are formed in the two le~er~ whiçh are adapted to accommodate sheath indenting knive~
effecti~e to remove the sheath with a further movement o~ the le~er.
In addition ~o thi~, at the articulation point between the body and second lever9 there are formed two respecti~e &aYities ~herein t~o blade~ fit which ~tana out to form a sort of cutter ~or cutting through the electric ~cable. . The pivotal connection between the body and second lever is currently accomplished by mea~ o~ a rivet pa`ssed through both these p~r~ and up~et at its opposed ends such a~ to enable the body to be rotat~d relatively to the le~r without an~ signi~icant axial pl~yO
It has be~n ~ound that with u~e~ the ri~et 9BD~

tends to wear out rather rapidly, whereby the cutter loses its effectiveness because the blades separate from each other and allow the cable to be cut to be inserted therebetween, thereby causing the blades to jam, i.e. the laterial distance between the blades when closed is longer than the diameter of the cable to be cut and the cable tends to jam between -the bladesn Accordingly, the technical object of this invention is to imporve the wire stripper of the type described above such as to obviate the cited problem.
Within this object it is a task of this invention to provide an improvement which, for a given effectiveness, can introduce no engineering complexities, thus making this stripper quite competitive from an economical standpoint.
This object and this task are achieved by an improvement characterized in that the body incorporates a metal ring wherethrough a bushing is passed axially, one end whereof is engaging prismatically with the lever, and a screw being inserted through said lever from the opposite side to the side wherefrom said bushing is received to engage with said bushing.
Further features of the invention will be more apparent from the following description of the embodiment thereof, illustrated in the accompanying drawing, where:
Figure 1 is a side view of the stripper, shown partly in section to bring into full view enclosed parts thereof; and Figure 2 is a sectional vlew taken along the line

2~84 II-II of Pigure 1.

The shown wira tripper comprlse~ a first lever 1 made o~ a sheet metal stamping which i3 bent o~er to form a ha~dle 1a o~ arcuate configuration and having a U-like cros~-~ectional shape open inwardly of the stripper. ~wo flat portions 1b,1c extend ; from the lever, of which the former iR shown partly cut away. Secured bet~een said flat portions is an element,defining a ~irst jaw 2 at ~ha ~reeend thereo~.
A body 3 is lQcated between the flat portions 1b, 1c, which is provided with an expansion forming a seco~d jaw 3a, be~g a mirror imageof the ~h~t jaw 2, and a port~n 3b of smaller thicknPss~ ~he portion 3b ha a circular ; lug 3c wherein a depression 3d is formed which has a small metal plate 4 defining a blade 4a embedded therein.
hole is proYided centrally through the circular lug 3c ~or accommodati~g a pi~ot pin therethrough for articulating the body 3 to a second lever 5O
The ~eco~d lever 5 ha~ a cavit~ 5a of compleme~tary shape to that ~ormed in the portion 3b~ with a circular region 5b which is intended to receive the lug ~c therein ~nd has a throughgoing hole ~or acco~mod~t-iDg the pivot pl~.
~ s~c~et 5c is formed in the c~ r r~ 5b~ ~h~re~
a small metal plate 6 is embedded which forms a blade 6a adap~ed to cooperate with the blade 4a. The blades 4a a~d 6a j ointly define a out~ er for cu~ing through cables to be stripped.

A composite construction pivot pin is provided for articulating the body 3 to the second lever 5. More specifically, a socket 3e is formed in the body 3 wherelnto a metal ring 7, which is a sleeve with a curved wall, is inserted, wherethrough a bushing 8 is passed, which has a small flange 8a adapted to remain embedded in the socket 3e and cover the metal ring 7.
The bushing 8 has a faceted end which engages in a complementary recess 5d of the second lever 5.
Thus, a prismatic coupling is formed between the second lever 5 and bushing 8 which prevents the bushing from turning relatively to the lever itself.
In order to hold the bushing 8 axially against the second lever 5, a screw 9 is provided which extends axially through the second lever 5 and engages into an axial hole 8b of the bushing.
As it may be appreciated, the invention fully achieves its objects.
It should be particularly noted that friction occurs between the bushing 8 and metal ring 7 as the lever is operated.
Any play developed by wear of the two parts may be taken up by appropriately tightening the screw 9.
The recess accommodating the bushing in the lever 5 will allow for such a small take-up movement in the axial direction.
In practicing the invention, the bushing 8 may be ~ormed of a high strength plastic material, such as the one known in the trade as NYLON, and the screw g may be of the self-tapping variety.
To facilitate introduction of the screw through the B

~z~

bushing, the latter ma~ be prQvided with a hole having a sub~ts~tially hexagonal cro~s-sectional ~hape .

Claims (3)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVIELEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. An improved wire stripper of the type comprising a first lever defining a handle and a first jaw, wherein a contoured body is articulated forming the second jaw adapted to cooperate with said first jaw in gripping one end of the cable to be stripped, a second lever being articulated to said body forming the second handle of the stripper and being arranged to oscillate relatively to said first lever against the bias force of a return spring, sockets being formed in said second lever and said body for accommodating two blades forming a cutter for cutting through an electric cable, characterized in that inserted in the body is a metal ring wherethrough a bushing is passed axially, one end thereof engages prismatically in a recess of said second lever, wherethrough a screw is inserted from the opposite side thereof, towards the side wherethrough said bushing is inserted, to engage said screw axially in said bushing.

2. An improved wire stripper according to Claim 1, characterized in that said bushing has a flange arranged to cover the metal ring, and that the end thereof in engagement with the second lever recess has a polygonal cross-section.

3. An improved wire stripper according to Claim 2, characterized in that the bushing is formed of plastic material and has a polygonal cross-sectional axial hole for engagement with a self-tapping screw.