Metal deforming – With means to actuate both elements of tool-couple – Handle actuated
Patent
1995-08-17
1997-07-22
Crane, Daniel C.
Metal deforming
With means to actuate both elements of tool-couple
Handle actuated
81313, 7240914, H01R 43042
Patent
active
056494440
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/SE94/00143, filed Feb. 21, 1994.
There is often a need to know whether or not a predetermined movement of a first part relative to a second part has been completed. Although not exclusively the case, this applies in particular to certain types of crimping tools, for instance tools intended for crimping terminal contacts onto electrical conductors, where a given crimping jaw movement must be executed in order to be able to guarantee that a reliable connection has been achieved between the conductor and the contact. Devices which function to prevent an interruption in such firm crimping operations prior to being completed have long been known to the art, for instance from GB-A-1,552,144, DE-C-2,555,071, DE-B-2,602,491 and also from U.S. Pat. Nos. 3,157,075 and 3,170,345. With the intention of quaranteeing that such movement will be completed, the known devices normally include a straight or curved toothed rack and a spring-biassed latching pawl which engages with the rack. Incorporation of the latching pawl, and particularly the spring arrangement, in the tool can sometimes create problems. More particularly, in the case of certain, otherwise favourable tool constructions, the pawl biassing spring may be accessible to foreign objects. For instance, the spring may be damaged by up-wardly protruding parts of objects with which it comes into contact when the tool is placed carelessly on a workbench.
The object of the present invention is to provide a novel and advantageous device of the kind mentioned in the introduction which can be constructed to indicate solely when a predetermined movement has been completed, or at the same time to prevent interruption of the predetermined movement prior to said movement being completed, and which device can be incorporated in a tool in a manner such as to essentially minimize the risk of damage should the tool be handled in a careless manner.
Further characteristic features of the invention and advantages afforded thereby will be apparent from the following description of a number of exemplifying embodiments of the invention made with reference to the accompanying drawings.
FIGS. 1 and 2 are respectively a side view and a top yew of an inventive crimping tool provided with a marking device.
FIGS. 3 and 4 are sectional views in lager scale and taken essentially on the line V--V in FIG. 2, and illustrate the construction of the marking device in the tool illustrated in FIGS. 1 and 2.
FIGS. 5 and 6 are views similar to the views of FIGS. 3 and 4 and illustrate alternative embodiments of the marking device.
Those elements in the drawings which coincide or essentially coincide with one another have been identified in the various Figures with the same reference signs.
FIGS. 1 and 2 illustrate in a closed position a crimping tool for performing crimping operations and comprising first and second jaws 16, 17 which are intended to support jaw inserts (not shown) for crimping terminal contacts onto electrical conductors for instance. The jaws 16, 17 are journalled at a first pivot point 18 for pivotal movement relative to one another between the illustrated, closed position and an open position (not shown) which enables, for instance, a cable end and a terminal contact which is to be crimped onto said cable end to be inserted between the inserts carried by the open jaws, The tool also includes a respective first and second handle referenced generally 19 and 20, which extend rearwardly from the jaws 16, 17. Each handle is comprised of a metal body which in the regions intended to be held by the user during a crimping operation are provided with outer coverings or outer handles, which are preferably made of a plastic material for instance and have a grip-friendly shape. The first handle 19 is connected rigidly to the first jaw 16. A forward end of the second handle 20 is pivotally connected to the second jaw 17 at a second pivot point 21, this second pivot point being located rearwardly of the first pivot point 18. A pressure force transmitting linkage
REFERENCES:
patent: 2088054 (1937-07-01), Crosman
patent: 3126772 (1964-03-01), Haucke
patent: 3157075 (1964-11-01), Filia
patent: 3170345 (1965-02-01), Poingt
patent: 4170154 (1979-10-01), Izraeli
patent: 5509291 (1996-04-01), Nilsson
Nilsson Mikael
Norin Mats
Crane Daniel C.
Pressmaster Tool AB
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