Tools – Wire stripper – Bench tools
Patent
1980-03-27
1982-05-18
Smith, James G.
Tools
Wire stripper
Bench tools
H02G 112
Patent
active
043298915
DESCRIPTION:
BRIEF SUMMARY
This invention relates to wire stripping tools used for removing or displacing a portion of the sheath or covering from a wire core, for example in preparing an insulated electrical conductor for connection.
British Pat. No. 1,110,935 discloses a range of wire stripping tools comprising a pair of outer jaws for gripping the sheath or covering, a pair of inner jaws located between the outer jaws for cutting into the sheath or covering, and a pair of handles which can be closed together so as to first close both pairs of jaws and then displace the inner jaws relative to the outer jaws, so as to move the cut portion of the sheath along the core. As mentioned in said Patent, the cut into the sheath need not be completed in that the displacing movement can tear the sheath so as to achieve a like effect.
The problem with wire stripping tools of this kind is to produce simple design capable of economical manufacture and which can cope with a range of different cables and the like, which may differ from one another in terms of overall thickness, core thickness, and sheath hardness.
The object of the present invention is to provide an improved tool for these purposes.
In accordance with the invention, a wire stripping tool of the kind comprising a pair of outer jaws for gripping a cable, a pair of inner jaws for cutting the sheath of the cable, a lever handle for closing the jaws, and at least one link between the handle and a drawbar for displacing the inner jaws relative to the outer jaws, is characterised in that at least one outer jaw is pivoted between its ends to a common member, and at its end to the lever handle, a spring being provided to resist drawbar displacement, the geometry of the pivotal axes being such that handle closing movement causes jaw closing against spring pressure, and after a transition point the spring deflects to allow drawbar displacement.
FIG. 1 of the drawings is a part sectional elevation of a preferred embodiment of a wire stripping tool.
FIG. 2 is a section on the line 2--2 of FIG. 1.
The tool shown in the drawings comprises a pair of outer jaws 10 for gripping the sheath or covering of a cable, and a pair of lever handles 12. The handles are pivotally connected to the jaws by pins 14 which also serve to fulcrum first links 16, these links 16 being pivoted at their other ends upon pins 18 to a cursor 20.
The outer jaws 10 are also pivoted on pins 22 which pass through a pair of mounting plates 23 (the common member) which lie in parallel planes and extend from the vicinity of the pins 22 to surround pin 24.
A pair of cutting jaws 26 is located between the gripping jaws 10, and these jaws are spring-urged apart by a small compression spring 28, the cutting jaws being pivoted together on pin 30 which also couples the inner jaws 26 to a drawbar 32. The cursor 20 is a slide fit on the drawbar, and a second pair of links 34 is pivotally connected to the drawbar by pins 36, the outer ends of these links 34 being pivotally connected to the lever handles 12 by further pins 38.
The drawbar is formed at the end opposite to pin 30 with a cutting edge 40, and this is arranged to slide past the second cutting edge 42 formed on a cutter plate held in position by pin 24.
The drawbar is conveniently formed with a pair of elongated and co-axial slots 44, 46 and a limit pin 48, 50 extends through each of these and also through the said metal mounting plates. The pin 50 serves as an end abutment for a helically wound compression spring 54, the opposite end of which uses the second links 34 as an end abutment, so that this spring tends to drive the drawbar and hence the cutting jaws 26 to the illustrated position relative to the length of the gripping jaws 10. The pin 48, in addition to guiding the drawbar for linear displacement (as later described) also serves to provide a limit stop for movement of the cursor 20 towards the jaws.
In operation, the cable to be treated is placed between the jaws generally in the position indicated by the chain dot line 60 and then the levers 12 are closed towards on
REFERENCES:
patent: 1151319 (1915-08-01), Wood
patent: 3146645 (1964-09-01), Hindenburg et al.
patent: 4112791 (1978-09-01), Wiener
patent: 4116092 (1978-09-01), Wheeler
Marshall, Jr. C. O.
Smith James G.
LandOfFree
Wire stripping tools does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wire stripping tools, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wire stripping tools will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-481747