Pivot locking device
AssigneeLong-Airdox Company
InventorsDavid M. Clonch, Fred D. Boyd, Michael J. Cook
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a pivoted lifting device having a main support frame selectively pivotable about a horizontal axis and engagement arms connected to the main support frame by a pivot pin. The engagement arms include an engagement surface. The pivoted lifting device allows the entire engagement surface to contact an article prior to the article being moved from an at rest position. The invention includes hydraulically actuated spring biased shaft having an unlocked position and also a locked position wherein it is located adjacent the engagement arms to lock the engagement arms in an upright position.
Claims14
A lifting device comprising:
- means for supporting a load to be lifted;
- means for engaging with said load, said engaging means pivotally coupled to said supporting means;
- means for limiting the extent of rotation of said engaging means in one direction, with respect to said supporting means, to define a limit position;
- and
- means for locking the engaging means at the limit position wherein the locking means includes a wedge slidably secured to the supporting means, the wedge slidable between an unlocked position and a locked or armed position, an abutment secured to the device, a contact surface on the engaging means, the contact surface located a first distance from the abutment at the limit position and located a second distance from the abutment with the engaging means located in a position adjacent to the limit position, the first distance greater than the second distance, and the wedge having a width substantially equal to the first distance, whereby the engaging means is locked in the limit position when the wedge is positioned between the abutment and the contact surface while the engaging means is in the limit position.
A lifting device for carrying a power source, comprising:
- a frame, said frame including a pair of spaced apart support members having one end rotatable about a horizontal axis and another end;
- engagement members having an engagement surface, said engagement members having a mid-section pivotally connected to said other end of said support members and freely rotatable relative to said support members, said engagement members each include a first end and a second end;
- means for limiting the extent of rotation of said engagement members in one direction, with respect to said support members, to define a limit position;
- and
- means for locking the engagement members at the limit position, said locking means includes a shaft movably secured to said frame, said shaft movable from an unlocked position to a locked or armed position, the shaft in the unlocked position is retracted out of the path of the first end of one of the engagement members, and in the locked position, the shaft is extended in the path of the first end of the one engagement member.
A battery changing system and electric battery powered vehicle, comprising:
- a support frame, said frame including spaced apart battery support members hingedly connected about a horizontal axis to said vehicle;
- means for selectively pivoting said support frame about said horizontal axis between an upright vehicle operating position and a downwardly angled loading and unloading position;
- a pair of battery engagement arms for engaging the battery, said pair of battery engagement arms each having a midsection pivotally mounted to a respective battery support member, the battery engagement arms having a first end and a second end, the second ends extend away from the frame, the engagement arms having a rotating moment to encourage the engagement arms to pivot in a predetermined direction to cause the second ends to move in a downward direction;
- a first stop plate secured to the support frame for limiting the extent of rotation of said battery engagement arms, with respect to said battery support members, to define a limit position;
- a first abutement secured to said support frame;
- and
- a first shaft movably secured to said frame, said shaft movable from an unlocked position to a locked or armed position substantially in contact with and between one of said battery engagement arms and said first abutement.
Dependencies are inferred from the claim text.