Scissors lift apparatus

A scissors arm apparatus, comprising:

• a chassis;
• a platform;
• an odd number greater than 2 of scissor arm assemblies, each assembly comprising:
• a center arm;
• a pair of outside support members pivotally connected at their longitudinal midpoint to the center arm;
• means for pivotally connecting one end of a center arm with an end of an adjacent center arm;
• and
• means for pivotally connecting the related ends of the outside arms with related ends of adjacent outside arms;
• pin means for connecting the lowermost center arm to the chassis;
• roller means for connecting the lowermost outside arms to the chassis;
• second pin means for connecting the uppermost outside arms to the platform;
• second roller means for connecting the uppermost center arm to the platform;
• and
• a hydraulic cylinder pivotally connected at one end to the chassis and at the other end to the longitudinal midpoint of the center arm of the lowermost arm assembly.

A scissors lift apparatus, comprising:

• a chassis;
• a platform;
• a scissors arm assembly connecting the chassis to the platform, comprising a center arm and two outside support arms pivotally connected at their longitudinal midpoint to define a pivot axis;
• pin means for connecting the lower end of the center arm to the chassis;
• roller means for connecting the lower ends of the outside support arms to the chassis;
• second pin means for connecting the upper ends of the outside support arms to the platform;
• second roller means for connecting the upper end of the center arm to the platform;
• and
• a hydraulic cylinder pivotally mounted to the chassis and to the longitudinal midpoint of the center arm.

A scissors lift apparatus comprising:

• a chassis;
• a platform;
• a first and second scissor arm assembly pivotally connected in series, connecting the chassis to the platform, each arm assembly comprising a center arm and two outside support arms pivotally connected at their longitudinal midpoints to define a pivot axis;
• pin and roller means for connecting the first assembly to the chassis and connecting the second assembly to the platform;
• and
• a hydraulic cylinder pivotally connected to the chassis and to the longitudinal midpoint of the center arm of the arm assembly connected to the chassis.

A scissors lift apparatus comprising:

• a support base;
• a work platform;
• a plurality of scissor arm assemblies connecting the support base to the work platform, each of the scissor arm assemblies comprising a center box girder and two outside support arms pivotally connected at their longitudinal midpoints, adjacent scissor arm assemblies pivotally connecting in series a center box girder end to an adjacent center box girder end so that the center box girders extend from the support base to the work platform thereby providing the scissors lift apparatus with improved torsional stability;
• and
• a hydraulic cylinder pivotally mounted to the support base and to the longitudinal midpoint of the first adjacent center box girder.

An outside support arm for a scissors lift assembly, comprising:

• a longitudinal member;
• and
• a first and a second ear casting, each casting attached to one longitudinal end of the member, comprising:
• a base;
• a first ear extending from the base having an outside surface extending substantially colinearly with the outside surface of the base and having a width about one-fourth the width of the base;
• and
• a second ear extending from the base having an inside surface extending substantially colineraly with the longitudinal axis of the base and having a width about one-fourth the width of the base.

An intermediate scissor arm assembly comprising:

• a center arm member having a top and a bottom flange and two side webs;
• a pair of outside support arms, one arm pivotally connected to each side web at the longitudinal midpoint of the support arms and the center arm;
• a cross member mounted at each longitudinal end of the center arm member;
• at least one ear extending from each longitudinal end of the cross member, whereby an end of the center arm connects in series to an end of a center arm of an adjacent scissors arm assembly by pinning the ears of the center arm to the center arm of the adjacent scissors arm assembly;
• and
• outside arm connection means for connecting the related ends of the outside support arms in series to related ends of outside support arms of an adjacent scissors arm assembly.

A connector for pivotally connecting together support members, comprising:

• a base adapted for rigidly attaching to the end of a support member;
• a first ear extending from the base having an outside surface extending substantially linearly with the outside surface of the base and having a width about one-fourth the width of the base;
• and
• a second ear extending from the base having an inside surface extending substantially linearly along the longitudinally axis of the base and having a width about one-fourth the width of the base.