Cutting – Means to drive or to guide tool – Constantly urged tool or tool support
Patent
1982-09-30
1985-07-09
Meister, James M.
Cutting
Means to drive or to guide tool
Constantly urged tool or tool support
83582, 83611, 83912, B43M 700
Patent
active
045274550
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for opening envelopes or the like having a base part, a movable knife blade, the cutting edge of which co-operates with a complementary member, and an actuating device.
BACKGROUND OF THE INVENTION
The most varied devices for opening envelopes or the like are already known. In the case of one such known device, a razor can be used to sever the edge of the envelope. It is guided exchangeably on a carriage which is displaceable along the letter and which is displaced by hand to open the envelope. To open the envelope, a board-like complementary member co-operates with the razor. This known device does not fulfill all the requirements posed. The opening of the envelope, particularly fairly long envelopes, is time-consuming and the cutting edge of the blade does not hold out for a long time.
The problem underlying the invention is to provide a device for opening envelopes or the like which is simple in construction, is simple to operate, extends the lives of the knives and cuts off the edge of the envelope that is to be severed without great expenditure of energy.
SUMMARY OF THE INVENTION
The invention solves this problem by providing the movable knife blade on a swingable knife holder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail hereinunder with reference to several exemplary embodiments which are shown in the drawings. In the drawings:
FIG. 1 shows a front view of a device embodying the invention;
FIG. 2 shows a top view of the device of FIG. 1;
FIG. 3 shows a side view, partially in section, of the device of FIG. 1; and
FIG. 4 shows a view, similar to FIG. 3, of a modified embodiment;
FIG. 5 shows a view, similar to FIG. 3, of another embodiment;
FIG. 6 shows a view, similar to FIG. 3, of a further embodiment; and
FIG. 7 shows a view, similar to FIG. 3, of still a further embodiment.
DETAILED DESCRIPTION
The device for opening letters or the like has a base part 1, a stationary knife holder 2, a movable knife holder 3 and a handle 4 which is formed on this.
The movable knife holder 3 is a substantially rectangular block 5 extending over the entire length of the knife and having flat side surfaces 6.
Formed on the side surfaces 6 are eccentrically-arranged pivots 7, which are mounted for rotation in bearings (not shown in more detail) of the base part 1.
On the front end face the block 5 has a circular segment or stop surface 48, the central point of which forms the centre axis of the pivots 7.
Linking to the circular segment surface 8 on the upper side and rising slightly inwardly is a flat bearing surface 9 for the movable knife blade 10. The movable knife blade 10 is fastened by means of screws 11 to the block 5. The bearing surface 9 is inclined in the longitudinal direction of the block 5, namely, as is evident from FIG. 1, rising in the drawing from left to right.
The movable knife blade 10 projects with its cutting edge 12 beyond the circular segment surface 8, namely past the edge that is to be cut off from the envelope 13 that is to be opened; preferably the cutting edge 12 projects by 0.6 mm over the circular segment surface 8, so that 0.6 mm of the envelope 13 is cut off.
The block 5 continues in the rearward region into an upwardly-extending part 14, which extends the entire length of the block, in order then to change into a part 15 which, bent towards the front side, extends forwardly while tapering in its cross-section. By the parts 14 and 15 there is formed the handle 4 which for the actuation of the device is moved by hand in the direction of the arrow I.
So that the application of the envelope 13 can be observed from above and in order to be able to release the screws 11 for exchanging the knife blade 10, an aperture 16 is formed, as indicated in broken lines, in the handle part 15.
For the automatic return of the knife block 5 into the initial position, limited by a stop (not shown), after actuation of the device the block 5 is spring-loaded, whereby it is returned in the direction of
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patent: 1302398 (1919-06-01), Mangini
patent: 1666533 (1928-04-01), Heck et al.
patent: 1833549 (1931-09-01), Anderson
patent: 1963873 (1934-06-01), Smith
patent: 3522752 (1970-08-01), Ford
patent: 3855891 (1974-12-01), Young
DELTA-REAL Establishment
Knoble John L.
Meister James M.
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