Shearing and crushing edges at automatically driven devices bear a substantial risk of injury for persons. To protect against these risks, safety sensitive edges are employed.
Applications such as machine guards, lifting tables, theatre stages and many others are typical. Safety Edges, when activated, will immediately switch off the power source.
Our Safety Edges use a unique highintegrity principle. They are built up of mechanically opening N/C contacts connected in series, in the form of a contact chain. Current conducting contact rollers and insulating intermediate elements (wedge rollers) are alternately lined up on an expander cord. By pretension, the contact rollers are pressed together, and the current circuit is made. Actuation of the Safety Edge leads to at least one pair of the contact rollers to separate by action of the wedge-shaped intermediate elements, and the current circuit is broken.
We offer a large range of variants, which are selected depending on the application (indoors/outdoors/dry/ wet/aggressive media) and inertia forces and speeds at the crushing position.

Safety Edge with mechanically opening contacts (Haake contact chain)

• safety category 3 & 4 to EN 954-1 (even the sensor!)
• no additional control unit required
• wired directly to existing E-stop relay unit
• operated from any direction (360°)
• various versions depending on application (indoors/dry - indoors/aggressive media - outdoors/wet)
• supply of ready-to-use Safety Edges according to customer’s specification
• BG approval

Pressure sensitive Safety Mats are employed for the protection of hazardous areas at machines and robots. They prevent presence or access of persons when the machine is running.
At devices such as machines, machining centres, presses, robot cells, highshelf warehouses and many others, our Safety Mat HSM immediately switches off the power source, when the mat is stepped on. As long as the person stays on the mat, the machine cannot be set back into operation.
Similar to our Safety Edges HSC, our Safety Mats are built up of mechanically opening break contacts connected in series, in the form of a contact mat. Current conducting contact plates and insulating wedge elements are alternately lined up on an expander cord. By pretension, the contact plates are pressed together, and the current circuit is made. When stepping on the safety mat, at least one of the contact plate pairs is separated by action of the wedge elements, and the current circuit is broken. Therefore, an additional safety control unit is not needed.
The contact mat is placed between polyurethane mats (other materials upon request) being sealed at their borders by profiles. The surface structure depends on customer’s wishes or the requirements in use. Please specify those when ordering. The Safety Mats are manufactured in the sizes as specified by each customer. Larger protection areas are achieved by several mats connected together. The surface patterns may also vary from application to application. In order to prevent the risk of slipping, chequer patterns are used. Around the Safety Mat area, an aluminium ramp trim serves for fixing and protection against tripping.

Safety Mat with positive-break contacts

• safety category 3 & 4 to EN 954-1 (even the sensor!)
• no additional control unit required
• wired directly to existing E-stop relay unit
• suitable for harsh environments
• different surface materials depending on application
• dimensions to customer’s specification
• supply of ready-to-use Safety Mats with machined perimeter trim
• BG approval

Shearing and crushing edges at automatically driven devices bear a substantial risk of injury for persons. To protect against these risks, safety sensitive edges are employed.
In certain applications, however, the power-operated devices have, due to their inertia and weight, long stopping times and thus also large stopping travels. Examples are big and heavy doors (hangar doors), automatic-guided vehicles (AGV), theatre stages etc.
In these cases, so-called bumpers are used. They are provided with a foam cushion with a suitable surface coating, if necessary reinforced and coloured. The dimensions as well as the positions and numbers of the contact chains are specially selected and manufactured for the intended application.
The contact chains are built up of current conducting contact rollers and insulating intermediate elements (wedge rollers), alternately lined up on an expander cord. By pretension, the contact rollers are pressed together, and the current circuit is made.
Actuation leads to at least one pair of the contact rollers to separate by action of the wedge-shaped intermediate elements, and the current circuit is broken. Transformation of the output signal is not required, since a contact-break signal is generated. This signal can be fed to an existing E-stop control unit.
Dimensions and colours as per customer’s specification.

Bumpers with mechanically opening contacts (Haake contact chain)

• safety category 3 & 4 to EN 954-1 (even the sensor!)
• no additional control unit required
• wired directly to existing E-stop relay unit
• various dimensions, shapes and colours depending on application
• resistant against many chemical substances
• contact chain directly at actuation face
• signal independent from direction of actuation

Dangerous machines and equipment are very often, to protect the operator, provided with guards and a guard locking device. The purpose of these devices is to prevent the hazardous machine functions as long as the guard is not closed and locked, and to hold the guard closed and locked until the risk of injury has passed.
Such guard locking devices are for instance key-operated mechanical interlocks, also called trapped-key systems. They are based on the easy-to-understand premiss that a key cannot be in two places at the same time - it can only be inserted in a switch OR be used for opening a guard. Another safety-relevant feature is that a key can only become free in a safe condition, when there are no hazards - a switch is turned off, a guard interlock is closed and locked.
The big advantage of the system is the fact that a certain sequence of steps can be pre-determined when designing the system. It is not possible to deviate from this sequence - thus a high degree of integrity is achieved. So virtually any hazard can be eliminated.

The system consists of a central electrical part (for instance in the control panel) and mechanical units at the guards.

• high safety, individual codes
• only predetermined high-integrity sequences are possible
• no spare tongue ‘in the pocket’
• no cables at the access doors (cost saving, faults prevented)
• easy retro-fitting
• guard interlocks have locking feature
• particularly suited when there are different energy sources for the machine (electric, pneumatic, ...)
• in areas where people might get trapped: personal safety key
• simple possibilities for teach-in
• time delay due to key transfer between switch and guard interlock - run-down processes come to a standstill (if necessary, extended by additional unit)