Jack assembly with secondary support features
A jack assembly includes a jack base and a primary support assembly. The primary support assembly includes a lift arm movably coupled to the jack base such that the jack assembly is movable between a lowered position and a raised position, a primary support member coupled to the lift arm and configured to engage a load when the jack assembly is in the raised position, and a handle configured to enable a user to cause movement of the lift arm. The jack assembly further includes a secondary support assembly. The secondary support assembly includes a secondary base supported by the jack base, a telescoping support movably coupled to the secondary base, and a secondary support member movably coupled to the telescoping support and coupled to the primary support member such that movement of the primary support member toward the raised position causes a corresponding movement in the secondary support member.
1 . A jack assembly comprising:
a jack base;
a primary support assembly comprising:
a lift arm movably coupled to the jack base such that the jack assembly is movable between a lowered position and a raised position;
a primary support member coupled to the lift arm and configured to engage a load when the jack assembly is in the raised position; and
a handle configured to enable a user to cause movement of the lift arm; and
a secondary support assembly comprising:
a secondary base supported by the jack base;
a telescoping support movably coupled to the secondary base; and
a secondary support member movably coupled to the telescoping support and coupled to the primary support member such that movement of the primary support member toward the raised position causes a corresponding movement in the secondary support member.
2 . The jack assembly of claim 1 , wherein the primary support member defines a first support surface configured to engage the load and the secondary support member defines a second support surface configured to engage the load; wherein the second support surface is recessed relative to the first support surface when the jack assembly is in the raised position.
3 . The jack assembly of claim 1 , further comprising a positioning member coupled to and extending between the primary support assembly and the secondary support assembly, the positioning member configured to maintain the secondary support assembly vertically aligned with the primary support member as the primary support assembly moves.
4 . The jack assembly of claim 3 , wherein the positioning member extends between the lift arm of the primary support assembly and the secondary base of the secondary support assembly.
5 . The jack assembly of claim 1 , further comprising an upper support arm coupling the secondary support member to the telescoping support.
6 . The jack assembly of claim 5 , wherein the upper support arm comprises a plurality of projections and the telescoping support comprises at least one pawl, wherein the at least one pawl is configured to selectively engage one of the plurality of projections to releasably secure the upper support arm at a desired height relative to the telescoping support.
7 . The jack assembly of claim 1 , wherein the telescoping support comprises a plurality of projections and the secondary base comprises at least one pawl, wherein the at least one pawl is configured to selectively engage one of the plurality of projections to releasably secure the telescoping support at a desired height relative to the secondary base.
8 . The jack assembly of claim 7 , further comprising a control member extending from the at least one pawl to the handle, wherein actuation of the control member causes the at least one pawl to disengage from the one of the plurality of projections and enable the telescoping support to telescope into the secondary base.
9 . The jack assembly of claim 8 , wherein the control member comprises a control cable extending along the handle and graspable by the user.
10 . The jack assembly of claim 1 , wherein the secondary support assembly is configured to support the load in the event of a failure of the primary support assembly.
11 . The jack assembly of claim 10 , wherein the secondary support assembly is configured to transmit a force of the load from the secondary support member to the jack base along a secondary load path that is substantially independent from a primary load path configured to transfer the force of the load from the primary support member to the jack base.
12 . The jack assembly of claim 1 , wherein the telescoping support comprises a plurality of telescoping supports configured to nest with each other and the secondary base when the jack assembly is in the lowered position.
13 . A jack assembly comprising:
a jack base;
a primary support assembly comprising:
a lift arm movably coupled to the jack base such that the jack assembly is movable between a lowered position and a raised position;
a primary saddle coupled to the lift arm and configured to engage a load when the jack assembly is in the raised position; and
a handle configured to enable a user to cause movement of the lift arm;
a secondary support assembly comprising:
a secondary base supported by the jack base;
a secondary saddle coupled to the primary support assembly such that movement of the primary saddle toward the raised position causes a corresponding movement in the secondary saddle; and
a plurality of telescoping supports extending between the secondary base and the secondary saddle, wherein the plurality of telescoping supports are releasably lockable at a plurality of different heights.
14 . The jack assembly of claim 13 , wherein the primary saddle defines a first support surface configured to engage the load and the secondary saddle defines a second support surface configured to engage the load; wherein the secondary saddle is recessed relative to the primary saddle when the jack assembly is in the raised position.
15 . The jack assembly of claim 13 , further comprising a positioning member coupled to and extending between the primary support assembly and the secondary support assembly, the positioning member configured to maintain the secondary support assembly vertically aligned with the primary saddle as the primary support assembly moves.
16 . The jack assembly of claim 15 , wherein the positioning member extends between the lift arm of the primary support assembly and the secondary base of the secondary support assembly.
17 . The jack assembly of claim 13 , further comprising a plurality of upper support arms coupling the secondary saddle to the plurality of telescoping supports, wherein the plurality of upper support arms each comprise a plurality of projections and the plurality of telescoping supports each comprise at least one pawl, wherein the at least one pawl is configured to selectively engage one of the plurality of projections to releasably secure each of the plurality of upper support arms at a desired height relative to the telescoping supports.
18 . The jack assembly of claim 13 , wherein the plurality of telescoping supports each comprise a plurality of projections and the secondary base comprises at least one pawl, wherein the at least one pawl is configured to selectively engage one of the plurality of projections to releasably secure the plurality of telescoping supports at a desired height relative to the secondary base.
19 . The jack assembly of claim 18 , further comprising a control member extending from the at least one pawl to the handle, wherein actuation of the control member causes the at least one pawl to disengage from the one of the plurality of projections and enable the plurality of telescoping supports to telescope into the secondary base.
20 . A jack assembly comprising:
a jack base;
a primary support assembly comprising:
a lift arm movably coupled to the jack base such that the jack assembly is movable between a lowered position and a raised position;
a primary support member coupled to the lift arm and configured to engage a load when the jack assembly is in the raised position; and
a handle configured to enable a user to cause movement of the lift arm;
wherein the primary support assembly defines a primary load path between the load and the jack base;
a secondary support assembly comprising:
a secondary base supported by the jack base;
a secondary support member coupled to the primary support member such that movement of the primary support member toward the raised position causes a corresponding movement in the secondary support member;
a plurality of telescoping supports extending between the secondary base and the secondary support member;
wherein, in the event of a failure of the primary support assembly, the secondary support assembly provides a secondary load path between the load and the jack base that is substantially independent from the primary load path.