A device 80 for cracking a seal formed around a manhole cover comprises a horizontal cross bar section 81 comprising a bottle jack holder recess 84, a bottle jack retaining means 87, two opposed leg sections 82, support struts 83 between the horizontal cross bar 81 and leg sections 82 and a jack cap section 76 which goes on top of the jack comprising two lifting eyes 77 comprising a hook 90 and lifting chains 78 for attaching to a manhole cover preferably via a manhole lifting arm 35. The horizontal cross bar 81 may have channel recess along its length. The bottle jack retaining means 87 may comprise a retractable lever arm 87 on one side of the bottle jack holder recess 84 and a retractable spring 89 on the opposite side. The retractable the arm 87 comprising a circular head 88 which fits over the neck of the bottle jack and is secured in place by spring 89 when in use.


    Access

    Download


    Export, share and cite



    Title :

    A cracker device


    Contributors:

    Publication date :

    2016-05-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / E02D FOUNDATIONS , Gründungen



    Lift Gas Cracker

    Berggren, Mark / Zubrin, Robert / Harber, Daniel et al. | AIAA | 2005


    SCHIFF MIT AMMONIAK CRACKER

    SCHWARZLOSE MARC | European Patent Office | 2024

    Free access

    Katalysatoren fuer Split-Cracker

    Gier,A. / Oelert,H.H. / Zajontz,J.,Weidenbach,G. et al. | Automotive engineering | 1976


    Schiff mit Ammoniak Cracker

    SCHWARZLOSE MARC | European Patent Office | 2024

    Free access

    Christmas cracker at Willesden

    British Library Online Contents | 2001