192 clutches and power-stop control – Stop mechanism – Safety device
Reexamination Certificate
2001-01-18
2001-12-04
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Stop mechanism
Safety device
C192S12900A, C160S024000, C160S120000, C052SDIG001
Reexamination Certificate
active
06325195
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The device of this invention resides in the area of shields that are positioned between a machine operator and the operative parts of a machine and more particularly relates to a machine safety guard and system using a plurality of such machine safety guards, each of which can be positioned, and selectively opened or closed, in front of operative parts of a machine.
2. Description of the Prior Art
Industrial machinery can cause injuries to operators thereof if they are caught within the operative parts of the machinery or struck by elements emanating from such machinery. To reduce the chances of such injuries, the government through OSHA has instituted regulations which call for protective safety guards to cover certain operative parts of a machine to prevent a worker from being caught thereby or otherwise injured as the machine operates. These safety regulations provide for protective machine guards to be positioned in front of the operative parts of machinery, some utilizing machine power cut-off switches which function when such safety guards are removed from their positions in front of the operative parts of the machinery. Frequently such safety guards can be in the form of a rigid sheet of plastic or glass which is fixed in front of the operative parts of the machinery. When such protective material is removed to gain access to the operating parts of the machinery, an electrical interlocking mechanism causes power to the machine to be turned off so that the machinery cannot be inadvertently operated when the safety guard is removed. Frequently machines require set-up for different jobs and this setting up period requires the operator to adjust elements of the machine to accomplish different functions during its operation such as using different materials or sizes of materials and/or different workpieces. It is often difficult and time-consuming to remove safety guards to gain access to the machine to change its set-up or otherwise adjust or repair such machinery, and such time-consuming procedures increase manufacturing costs.
Also well known in the prior art are light beam detectors which can sense when a light beam is interrupted for the purpose of shutting down the machinery. Such a system senses when one tries to reach towards a machine but is ineffective against projectiles flying away from the machinery which could injure a bystander.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an improved machine safety guard interconnected to a machine's power source which safety guard is fast and easy to operate and which gives an operator of a machine quick and safe access to the machine to change its set-up or otherwise adjust or fix any operative parts of the machine when the safety guard is in its open mode position and the machinery is not operating.
It is a further object of this invention to provide a system of independently operated safety guard units which in one embodiment can be interconnected to one another and which individual units can be positioned around or on a machine at selected angles, heights, widths and distances from the machine to allow access to various operating parts of the machine at any desired time by the operator. Further, the safety guard units of this invention can be quickly and easily operated to disable the machine to allow access thereto to provide safety to the operator while set-up procedures or other maintenance operations are being performed on the machinery.
To achieve the goals of this invention a safety guard unit is provided which has a first and second side track member joined at their tops in one embodiment by an upper support member which is disposed perpendicularly to the side track members. Each of the side track members can extend perpendicular to the floor, each track member having an inwardly facing channel defined on its inner side with such channels facing and aligned with one another. these side track members are disposed in front of the operative parts of the machine to be shielded by the safety guard. Within the upper support member can be disposed a rotatable reel having a flexible, transparent panel attached thereto along its length. This panel can be a sheet of clear, transparent PVC material or equivalent material. A reversible motor is provided to drive the reel and attached transparent panel to wind and unwind it to move the panel up and down within the channels between the first and second side track members. The flexible, transparent panel can be stopped at any position during its vertical travel, either all the way up, all the way down or at any intermediate position. The motor can be located on the upper support member or at any desired location on the safety guard unit and can be of the reversing type. The bottom of the guard can be weighted to pull it down against the force of the motor or other systems of pulleys or gears can be used to aid in the raising or lowering of the transparent panel. The transparent panel can be raised or lowered very quickly, and its bottom which is generally disposed horizontally can be flexible so that if it strikes the operator while in operation, it will not cause harm because of the flexible nature of the clear plastic sheet material. A plurality of these safety guard units of this invention can be disposed around a large piece of equipment, each safety guard unit giving access to a different portion of the machinery to be operated. The safety guard units can have differing widths and heights and can have independent control switches for each safety guard unit so that each unit's transparent panel can be raised or lowered independently of another's to gain access to a particular part of the machinery. The safety guard units, because they also tend to block sound, will cut down on the noise emanating from operating machinery.
The safety guard units can be mounted on the machinery itself or disposed adjacent to the machinery, either permanently affixed to the floor or disposed on wheels for portability to a desired location or position where the wheels can be locked.
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Declaration of R. Peter Kimener Regarding U.S. Playing Card Installation; 3 pages w
Dennison, Scheiner Schultz & Wakeman
Lorence Richard M.
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