Abstract A rope or chain rupture safety device for a blowing lance secured to two ropes or chains, respectively, of which one rope or chain is passed over a driven main drum and the other rope or chain is passed over an unstressed auxiliary drum, the auxiliary drum being connected with said main drum by means of a multiplate friction clutch arranged between them and rotatable relative to said main drum in case of a rope or chain rupture, in which the improvement resides in that the auxiliary drum comprises an element which is rotatable relative to the main drum, connected with the shaft of the main drum by screw threaded means and screwable towards the friction clutch under progressively increasing engagement pressure of the plates of the friction clutch. This design is simple and safe. It affords the advantage that the auxiliary rope is loaded only with the double nominal load when the main rope breaks and that the initial braking moment may be lower by about one-third than so far.
A rope rupture safety device for a blowing lance secured to two ropes, whereof one rope is passed over a driven main drum and the other rope is passed over an idling auxiliary drum connected with said main drum through an interposed multiplate friction clutch and rotatable relative to said main drum in the event of a rope rupture, said auxiliary drum comprising an element which is rotatable relative to said main drum, connected to a projecting shaft portion of said main drum by means of a screw thread and screwable towards the friction clutch under progressively increasing engagement pressure of the plates of the friction clutch.
Claim 2
Dependent Claim
107 words
A rope rupture safety device for a blowing lance secured to two ropes, whereof one rope is passed over a driven main drum and the other rope is passed over an idling auxiliary drum connected with said main drum through an interposed multiplate friction clutch and rotatable relative to said main drum in the event of a rope rupture, said auxiliary drum comprising an element which is rotatable relative to said main drum, connected to a projecting shaft portion of said main drum by means of a screw thread and screwable towards the friction clutch under progressively increasing engagement pressure of the plates of the friction clutch.
Claim 3
Dependent Claim
43 words
The safety device set forth in claim 1, wherein prestressed springs are provided between said element rotatable together with said auxiliary drum and the plates of the friction clutch, which springs are pressed together when said element is screwed towards the friction clutch.
Claim 4
Dependent Claim
20 words
The safety device set forth in claim 1, wherein said element of said auxiliary drum is designed as a disc.
Claim 5
Dependent Claim
56 words
The safety device set forth in claim 1, wherein said shaft portion on which the auxiliary drum is rotatable is rigidly fixed to said main drum, the friction clutch, said rotatable element with a threaded sleeve, and a pin fixed to said shaft and provided with a corresponding screw thread being arranged within the auxiliary drum.
Claim 6
Dependent Claim
28 words
The safety device set forth in claim 1, wherein a stop is provided for limiting the rotation path of the auxiliary drum in relation to the main drum.