Cutlery – Cutting tools – Plural cooperating blades
Patent
1992-02-03
1994-06-07
Seidel, Richard K.
Cutlery
Cutting tools
Plural cooperating blades
30245, B26B 1326
Patent
active
053178068
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to pruning shears of the type including a moveable and a fixed arm which are spring biased apart and are moveable together. A traction cable helps move the arms together. Such pruning shears are known from German Patent U1 88 02 649. The traction cable is guided over a cable pulley on the axis. The axis of the cable pulley intersects the swivel axis at right angles. This has the result that upon the swinging of the shears around the swivel joint, the cable is lifted out of the cable pulley and jams upon pulling.
German Unexamined Application for Patent OS 36 40 390 discloses shears having a swivel joint. In this case, the swivel axis of the swivel joint is on a line with the fixed arm of the shears. In addition to the guide pulley at the free end of the handle a further guide pulley arrangement at the end of the fixed arm of the shears is required here. Nevertheless, operation without jamming is not always assured.
In the case of another pruning shears in accordance with Swiss patent 582 464 the traction cable is guided in such a manner that it intersects the swivel axis at right angles instead of being on a line with it.
In the case of another known shears in accordance with German patent U1 82 24 195, the axis of the guide pulley at the end of the handle is on a line with the axis of the swivel joint. Another guide pulley is provided in the adaptor sleeve of the fixed arm of the shears.
It is the object of the invention, proceeding from the aforementioned prior art, so to develop shears of this type that dependable guidance of the cable without the danger of jamming is assured in all conceivable positions of operation. This object is achieved by the features set forth below.
As a result of the fact that, in accordance with the first feature, the axis of the swivel joint is on a line with the axis of the guide pulley, assurance is had that upon swinging the shears into any angular position, guidance is also assured by the pulley which is not swung. By the features of the second part of the body of the claim, the result is achieved that the movement of the guide part takes place around the indicated center position with aligned axis, whereby favorable cable guidance is assured with slight pulley expense.
By the above-indicated alignment of the swivel axis, cutting can be effected via the cable in any angular position with the same expenditure of force. The angular position of the shears has no effect on the force required. Due to the fact that the shears can be set to any cutting plane, they are particularly suitable shears for green material. Due to the fact that in any angular position the mouth of the shears lies in a straight-line or offset extension of the guide handle, one can readily aim at the specific branch to be cut. The various angular positions can be set by means of detent elements, although attachment by clamping screw is preferred.
One embodiment of the invention will be described below with reference to the drawing, in which:
FIG. 1 is a front view of the shears of the invention;
FIG. 2 is a longitudinal section through the shears of FIG. 1;
FIG. 3 is a view, partially in section, turned 90.degree. with respect to FIGS. 1 and 2;
FIG. 4 is a view corresponding to FIG. 1 of the shears, partially opened.
The pruning shears shown in FIGS. 1 to 3 has a tool-insertion shank 10 of a handle-attachment coupling which can, for instance, be developed according to German patent 31 30 703. By means of the handle-attachment coupling, the shears can be placed on a longer or shorter guide handle. It is, however, also possible to secure the shears firmly to the handle. The tool insertion shank 10 extends through a stop collar 12 having an upper extension 14 into a plastic injection-molding 16 in which the extension 14 is anchored and secured by a rivet 18. The plastic part 16 has two fork arms 20 extending laterally obliquely upward, between which a cable pulley 24 is mounted by means of a pin 22. The plastic part furthermore has upwardly protruding fork arms 26, between which
REFERENCES:
patent: 3360858 (1968-01-01), Cowley
patent: 3835535 (1974-09-01), Robison et al.
patent: 4224739 (1980-09-01), Emblidge
patent: 4696107 (1987-09-01), Held
Held Peter
Weid Helmut
Payer Hwei-Siu
Seidel Richard K.
Wolf-Gerate GmbH Vertriebsgesellschaft KG
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