Metal deforming – With means to actuate both elements of tool-couple – Handle actuated
Patent
1994-10-06
1996-04-23
Crane, Daniel C.
Metal deforming
With means to actuate both elements of tool-couple
Handle actuated
72451, 29751, 81313, 81376, 81380, H01R 43042
Patent
active
055092918
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/SE93/00291, filed Apr. 5, 1993.
The present invention relates to a crimping tool for, e.g., manually crimping electrical terminal contacts onto the ends of cables, and being of the kind which includes first and second crimping jaws each of which is provided with an individual crimping part and which are journalled in relation to one another at a first pivot point for pivotal movement between an open position and a closed crimping position, and which includes first and second handles which are intended for pivoting the jaws and which extend rearwardly from said jaws, wherein the first handle is rigidly connected to the first jaw at a front end of said first handle whereas the second handle is pivotally connected to at least a par: of the second jaw at a front end of the handle in a second pivot point located rearwardly of the first pivot point, and wherein a linkage construction extends obliquely rearwards from a third pivot point on the second handle, rearwardly of said second pivot point, up to a fourth pivot point on the first handle.
Such tools (see for instance GB-A-1 522 144 and DE-C-2 555 071) are used to a large extent in the manufacture and installation of electrical and electronic devices. When using these known tools, it is necessary to exert relatively considerable force in order to complete the crimping operations concerned, resulting in tiredness of the tool operator and in the risk of causing bodily strain to an operator who is required to carry out such operations regularly.
The present invention is based on the problem of providing a novel and advantageous crimping tool of the kind defined in the introduction, whose construction is such that the tool will be essentially optimized from an ergonomical aspect, so as to eliminate at least substantially the problems associated with such tools.
With the intention of solving the aforesaid problem, it is proposed in accordance with the invention that the distance between the first and the second pivot points is 0.30-0.35 times the distance between the first and the fourth pivot points, that the distance between the second and the third pivot points is 0.20-0.25 times the distance between the first and fourth pivot points, and that the distance between the third and the fourth pivot points is 0.62-0.66 times the distance between said first and said fourth pivot points, and that in the closed crimping position of the jaws a plane which contains the second and the third pivot points, with the an angle within the range of 165.degree.-180.degree. with a plane which contains the third and the fourth pivot points, with the apex of the angle facing away from a plane that contains the first and the fourth pivot points.
Other objects of the invention are to provide a crimping tool which is constructed of flat parts, to provide a crimping tool which is capable of gripping objects, for instance a cable end and a cable shoe which is to be crimped onto said cable end, so that a two-hand grip can be used if so desired, and to provide a crimping tool which is provided with an improved marking device for indicating that a crimping tool movement has been completed. These and other objects described in the following description are achieved with a crimping tool having the characteristic features set forth in the depending claims.
The invention will now be described in more detail with reference to chosen exemplifying embodiments thereof and also with reference to the accompanying drawings.
FIGS. 1-3 illustrate schematically and in side view a first, second and third embodiment of the inventive crimping tool respectively.
FIGS. 4-6 are respectively a view from beneath, a side view and a view from above of a fourth embodiment of the inventive crimping tool.
FIG. 7 shows in side view a fifth embodiment of the inventive crimping tool.
FIGS. 8 and 9 are central longitudinal sectional views in larger scale of a portion of the tool of FIG. 7 provided with a marking device which prevents the interruption of an initiated crimping tool movement
REFERENCES:
patent: 2519630 (1950-08-01), Boyer
patent: 2752812 (1956-07-01), Steine
patent: 3157075 (1964-11-01), Filia
patent: 3170345 (1965-02-01), Poingt et al.
patent: 4526070 (1985-07-01), Wiener
patent: 5280716 (1994-01-01), Ryan
Nilsson Mikael
Norin Mats
Crane Daniel C.
Pressmaster Tool AB
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