A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
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.
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.
A cracker device
ROGER DOHERTY (author)
2016-05-04
Patent
Electronic Resource
English
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
British Library Online Contents | 2003
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British Library Online Contents | 2003