초록 ▼

The invention concerns a joint comprising a flat metal core made of soft steel, coated on each of its surfaces with a layer of elastomer bound by constituents ensuring its adherence on the metal, the thickness of the elastomer varying on the joint surface, depending on the shape of the parts between

The invention concerns a joint comprising a flat metal core made of soft steel, coated on each of its surfaces with a layer of elastomer bound by constituents ensuring its adherence on the metal, the thickness of the elastomer varying on the joint surface, depending on the shape of the parts between which the joint is designed to be mounted and the sealing requirements at each point on the joint surface, the elastomer being cold deposited on each joint surface, then the whole assembly being placed in a heated mould, for forming the elastomer before vulcanisation.

대표청구항 ▼

The invention concerns a joint comprising a flat metal core made of soft steel, coated on each of its surfaces with a layer of elastomer bound by constituents ensuring its adherence on the metal, the thickness of the elastomer varying on the joint surface, depending on the shape of the parts between

The invention concerns a joint comprising a flat metal core made of soft steel, coated on each of its surfaces with a layer of elastomer bound by constituents ensuring its adherence on the metal, the thickness of the elastomer varying on the joint surface, depending on the shape of the parts between which the joint is designed to be mounted and the sealing requirements at each point on the joint surface, the elastomer being cold deposited on each joint surface, then the whole assembly being placed in a heated mould, for forming the elastomer before vulcanisation. ary winding, a secondary winding, and a feedback winding; a main switching element receiving a feedback signal from the feedback winding and which turns the current in the primary winding on and off; a rectifying and smoothing circuit comprising a rectifying element and a smoothing element, connected to the secondary winding; and a control circuit connected between the feedback winding and a control terminal of the main switching element, a delay circuit for prohibiting the turning on of the main switching element for a certain period of time after the current flowing through the rectifying element has become substantially zero, and a switching circuit for changing the delay time of the delay circuit. 2. The switching power supply unit of claim 1, wherein the delay circuit has a switching device and a time constant circuit which are provided between the feedback winding of the transformer and the control terminal of the main switching element, and wherein the switching circuit switches the time constant of the time constant circuit. 3. The switching power supply unit of claim 1, further comprising: an output power detector circuit for rectifying and smoothing the voltage of the feedback winding of the transformer by a rectifying element and a smoothing element; and a delay time extension circuit connected between the output power detector circuit and the control terminal of the delay circuit through a resistor element. 4. The switching power supply unit of claim 2, further comprising: an output power detector circuit for rectifying and smoothing the voltage of the feedback winding of the transformer by a rectifying element and a smoothing element; and a delay time extension circuit connected between the output power detector circuit and the control terminal of the delay circuit through a resistor element. 5. The switching power supply unit of claim 1, wherein the switching circuit can be switched by an external signal. 6. The switching power supply unit of claim 2, wherein the switching circuit can be switched by an external signal. 7. The switching power supply unit of claim 3, wherein the switching circuit can be switched by an external signal. 8. The switching power supply unit of claim 1, further comprising: a current detector circuit for detecting the current flowing through the secondary winding; and wherein the switching circuit switches the delay time of the delay circuit after a certain period of time when the current detector circuit detects that the load current or load power has changed from a normal load mode to a lower power standby mode. 9. The switching power supply unit of claim 2, further comprising: a current detector circuit for detecting the current flowing through the secondary winding; and wherein the switching circuit switches the delay time of the delay circuit after a certain period of time when the current detector circuit detects that the load current or load power has changed from a normal load mode to a lower power standby mode. 10. The switching power supply unit of claim 3, further comprising: a current detector circuit for detecting the current flowing through the secondary winding; and wherein the switching circuit switches the delay time of the delay circuit after a certain period of time when the current detector circuit detects that the load current or load power has changed from a normal load mode to a lower power standby mode. 11. The switching power supply unit of claim 5, further comprising: a current detector circuit for detecting the current flowing through the secondary winding; and wherein the switching circuit switches the delay time of the delay circuit after a certain period of time when the current detector circuit detects that the load current or load power has changed from a normal load mode to a lower power standby mode. 12. The switching power supply unit of claim 4, wherein the output power detector circuit is coupled across t