Safe access arrangement for driven mechanisms in a printing press
US4000693A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Jun 23, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16P3/144
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A safe access arrangement for a printing press having remotely located driven mechanisms normally enclosed by guards or covers and which are removable to provide access for observation, adjustment or servicing. Remote control modules are located under the respective access covers each module having a motor remote control switch and a shiftable interlock switch, the shiftable switch being automatically thrown from a normal position to a shifted position when the access cover is removed. Each shiftable switch includes a first contact for disabling the main switch of the press and a second contact for activating, or "enabling", operation of the associated motor remote control switch so that the motor may only be turned on by the remote control switch at the location of the open cover. Each shiftable switch includes interlock contacts paired with corresponding contacts in each of the other remote control modules to control a disabling circuit so that the motor is totally disabled when two or more covers are open simultaneously, thereby to prevent someone at a second opened cover from starting the motor and causing injury to the press operator, or damage to the mechanism, at a first ope…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.