US 8,985,275 B2Granted

Lift safety system

AssigneeReechcraft, Inc.

InventorsJason M. Solhjem, Shane L. Nickel

Life of this patent

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Abstract

A lift safety system that prevents the lifting of a support platform from a support base until all of the support legs for the support base are supporting a minimum amount of weight to ensure stability of the lift. The support base includes a plurality of legs that extend outwardly with each of the legs having an adjustment member with a pad that engages a ground surface. As the adjustment member is adjusted downwardly with respect to the leg, a first engaging member connected to the adjustment member is elevated upwardly to engage a second engaging member thereby releasing a corresponding finger member attached to the support platform from the support base. Once all of the legs are supporting a minimum amount of weight, all of the finger members are released from the support base thereby allowing elevation of the support platform.

Claims20

Dependent claims

A portable lift, comprising:

a support base having a plurality of legs, wherein each of said plurality of legs respectively includes a distal portion and an inner portion;
a plurality of adjustment members, each of said plurality of adjustment members extending downwardly from each of said distal portions of said plurality of legs respectively and configured to move vertically between a first position which is disengaged from a support surface and a second position which engages the support surface;
a first lock member attached to said support base;
a vertical mast extending upwardly from said support base;
a support platform movably connected to said vertical mast, wherein said support platform is adapted to move upwardly and downwardly upon said vertical mast;
and
a second lock member attached to said support platform and adapted to mechanically connect to said first lock member;
wherein said first lock member in combination with said second lock member form a pair of locking members which are configured to move between a locked state and an unlocked state, wherein said locked state locks said pair of locking members together which locks said support platform to said base and prevents said support platform from moving along said mast, wherein said unlocked state has said pair of locking members unlocked from one another to allow movement of said support platform vertically along said mast, wherein said pair of locking members is configured to switch from said locked state to said unlocked state as a direct result of at least one of said plurality of adjustment members moving from said first position to said second position which moves an engaging member along a major length of a corresponding one of said plurality of legs to unlock said pair of locking members from one another.

5 more elements

A portable lift, comprising:

a support base having
distal portion and inner portions;
a plurality of adjustment members extending downwardly from said distal portions of said support base and configured to move vertically between a first position which is disengaged from a support surface and a second position which engages the support surface;
a first lock member attached to said support base;
a vertical mast extending upwardly from said support base;
a support platform movably connected to said vertical mast, wherein said support platform is adapted to move upwardly and downwardly upon said vertical mast;
and
a second lock member attached to said support platform and adapted to mechanically connect to said first lock member;
wherein said first lock member in combination with said second lock member form a pair of locking members which are configured to move between a locked state and an unlocked state, wherein said locked state locks said pair of locking members together which locks said support platform to said base and prevents said support platform from moving along said mast, wherein said unlocked state has said pair of locking members unlocked from one another to allow movement of said support platform vertically along said mast, wherein said pair of locking members is configured to switch from said locked state to said unlocked state as a direct result of at least one of said plurality of adjustment members moving from said first position to said second position which moves an engaging member along a major length of said support base to unlock said pair of locking members from one another.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/517,534Filed 17 Oct 2014 · continuation
Priority: 29 Jun 2011
Published: US 2015/0034417 A15 Feb 2015
Granted: 24 Mar 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B66F 11/04
Lifting devices specially adapted for particular uses not otherwise provided for: for movable platforms or cabins, e.g. on vehicles, permitting…
E04G 1/20
Adjustable in height: scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
E04G 1/22
Adjustable in height: scaffolds having a platform on an extensible substructure, e.g. of telescopic type or with lazy-tongs mechanism
E04G 1/24
Scaffolds primarily resting on the ground: comprising essentially special base constructions; comprising essentially special ground-engaging…

Family

Application61/502,421Us provisional application · filed 29 Jun 2011
Application13/536,140Parent of this continuation · filed 28 Jun 2012
US 2015/0034417 A1Pre-grant publication · published 5 Feb 2015
US 8,863,899 B2Parent of this continuation
US 2013/0001013 A1Published application
US 8,985,275 B2This patent

From the US filing history. Foreign family members aren’t listed.