Solid material comminution or disintegration – Apparatus – With automatic control
Patent
1999-04-27
2000-09-12
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With automatic control
241 375, 241100, 241236, B02C 2500
Patent
active
06116528&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a safety switch primarily for those types of paper shredders in which the cutting mechanism housing containing the cutting tools is placed loosely on the cut paper collecting container.
2. Description of the Related Art
This group of devices is more and more used in private residences particularly in the form of so-called particle cutters for destroying confidential records, such as bills, bank statements, official letters, etc., so that in view of the access by small children and the play activity of small children very special safety precautions must be taken by the manufacturers of the devices to ensure that nobody can move their fingers from below into the running cutting mechanism through the discharge gap for the cut material.
SUMMARY OF THE INVENTION
Accordingly, it is the object of the present invention to provide a simple and absolutely reliable drive disconnection which is suitable for this purpose and occurs already when the smallest lifting movement from any side of the housing occurs. The core and simultaneously the technical teaching of the present invention is the arrangement of the safety switch at the housing including switching pin and counter-cam on the cut paper collecting container at an angle to the vertical; the order of magnitude of this angle advantageously corresponds to about 45.degree..
BRIEF DESCRIPTION OF THE DRAWING
In addition, with the aid of an essentially schematic drawing sketch and a detailed description, the invention will be explained below in more detail; in the drawing:
FIG. 1 is a system cross-section through the upper part of the cutting mechanism including the upper portion of the cut paper collecting container;
FIG. 2 shows the limit switch area of the same illustration enlarged to about 1:1; and
FIGS. 3a and 3b are additional views showing the limit switch area.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The conventional basic construction of the illustrated paper shredder is formed by the cutting mechanism housing 1, 1a including lower tray 1b and cutting mechanism 5 placed on the upper edge 2a of the cut paper collecting container 2. The basic system is completed by a switching element 3 at the housing 1 for stopping the drive including a switching pin 3a and switching cam 4 at the upper container edge 2a.
The novel and inventive aspect in such a device is the fact that the switching pin 3a of the safety switch and has a line of influence W extending perpendicularly relative to an inclined surface 4a of the stop cam 4 in the inner area 2a' of the upper container edge 2a and this line of influence W is inclined relative to the vertical axis V of the paper shredder 1, 2, wherein, in a special configuration, the switching cam 4 actuating the safety switch 3 is located a significant vertical distance P.sub.1 below the imaginary point of rotation P formed by the placement of the cutting mechanism housing 1 on the upper container edge 2a.
As a result of this novel and particular arrangement of the safety switching elements, the device is switched off immediately as soon as the cutting mechanism housing 1 is moved even by only a tiny distance out of its basic position; this is because, in conventional devices the deficiencies with respect to safety technology were primarily due to the fact that it was possible to lift at least one side of the cutting mechanism housing and grasp into the interior of the container while the switching cam still actuated the limit switch.
FIGS. 3a and 3b show the cutting mechanism area in more detail. Specifically, FIG. 3a shows the safety switch in the actuated position and FIG. 3b shows the safety switch when not actuated, i.e., when the cutting mechanism housing is lifted from the collecting container 2. The drawing shows in FIGS. 3a and 3b that the line of influence W of the switching pin 3a of the safety switch extends perpendicularly of the inclined surface 4a of the actuating cam 4. As is apparent from the drawings, this line of influence W ext
REFERENCES:
patent: 5772129 (1998-06-01), Nishio et al.
Kueffner Friedrich
Rosenbaum Mark
LandOfFree
Safety switch for paper shredders does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Safety switch for paper shredders, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety switch for paper shredders will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-88441