Cutlery – Combined cutlery or combined with ancillary feature – With material-holder or disposal
Patent
1989-11-01
1990-07-10
Watts, Douglas D.
Cutlery
Combined cutlery or combined with ancillary feature
With material-holder or disposal
30162, 30335, B26B 300
Patent
active
049398393
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a knife with a retractable blade, particularly but not exclusively to a knife incorporating a replaceable blade of the kind suited for use by carpet layers and other craftsmen.
Knives with retractable blades are known. Generally the handle of such a knife is made of two separable parts which together define a housing in which the blade can be retracted. In addition the handle provides for storage of replacement blades. In the known construction the handle parts can be separated to admit access to the interior irrespective of the disposition of the retractable blade. It is now recognised that serious accidents can occur if the handle parts should separate while the blade is extended and the knife is in use. The present invention has been made with this problem in mind.
According to the invention there is provided a knife comprising a handle formed in two handle portions, said handle portions being connected together by a pivot and being pivotally movable between an open position and a closed position, the handle portions in said closed position defining a housing, a retractable blade mounted on a blade carrier, the carrier being movable between a first position wherein the blade projects from the housing and a second position wherein the blade is retracted into the housing such that the blade is not substantially capable of further rearward movement characterised in that the two handle portions are locked in the closed position when the carrier is in the first position and are unlocked when the carrier is in the second position.
In a preferred embodiment of the invention the carrier is moved by an actuating member which is preferably manually operable. The carrier is movablele to one or more positions intermediate the first position and the second position wherein the blade is partially or wholly retracted within the housing, the handle parts remaining locked while said carrier is in an intermediate position. The actuating member is movable between a first position wherein movement of the carrier between the first position and an intermediate position is restrained and a second position wherein movement of the carrier between said first and intermediate positions is possible. The actuating member is further movable into a third position in order to move the carrier between its intermediate and second positions. Means are preferably provided for urging the actuating means into its first position.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a knife in accordance with this invention, the blade being retracted;
FIG. 2 shows the interior of the right hand portion of the knife;
FIG. 3 is a plan view of the knife;
FIG. 4 is a cross section on A--A of FIG. 3
FIG. 5 illustrates the latch member of the knife; and
FIG. 6 is a perspective view of the blade carrier of the knife.
FIG. 1 of the drawings illustrates a knife having a retracted blade located in a slot 5, the handle being formed in two portions 1,2 connected together by a pivot 4 arranged so that the two portions may be rotated in planes generally parallel to that of the blade. Rotation of one of the portions provides access to the interior of the handle, facilitating replacement of the interior of the handle, facilitating replacement of the blade and providing access to a store of replacement blades located within the handle. An actuating member having a plate 3 which may be engaged manually, for example by a user's thumb, is arranged for sliding movement longitudinally of the knife to extend or retract the blade. When the blade is fully retracted such that the blade no longer projects from the handle, the plate 3 may be moved further rearwardly to unlock the two handle portions, for example to replace the blade. The two portions are securely locked together when the blade is extended, preventing the blade from moving within the handle when in use.
The internal construction of the knife is illustrated in FIG. 2. T
REFERENCES:
patent: 3708881 (1973-01-01), Bennett
patent: 3927473 (1975-12-01), Braginetz
patent: 4005525 (1977-02-01), Gringer
patent: 4068375 (1978-01-01), Rathbun et al.
patent: 4604805 (1986-08-01), Krieger
The Paramo Tools Group Ltd.
Watts Douglas D.
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