US 2021/0246005 A1 · Lift Truck Hoist Attachment

Abstract

A lower mast is attached to a base having fork pockets, and is pivotal between vertical and horizontal positions. A lower mast brace assembly has a receiver configured to receive the lower mast as it is moved into the generally vertical position, and to retain it there. An upper mast having a hoist at its upper end slides into the lower mast. The upper mast has a dogleg that offsets the hoist forward of the centerline of the lower mast. A hook is attached to the lower mast brace assembly near the receiver. The hinge, the lower mast brace assembly, the dogleg of the upper mast, and the hook are arranged so that the hoist may be used to pull the mast from the horizontal position to the vertical position. A combination limit switch, buffer, and vertical shutoff switch may be attached to the upper end of the upper mast.

Claims22

Dependent claims

A Lift Truck Hoist Attachment, comprising:

a base having at least one fork pocket;
a lower mast attached to the base by way of a hinge and pivotal between a generally vertical position and a generally horizontal position;
a lower mast brace assembly attached to the base and having a receiver configured to receive the lower mast as it is moved into the generally vertical position, and to retain the lower mast once the lower mast is in the generally vertical position;
an upper mast slidably engageable with and dis-engageable from the lower mast;
a hoist attached to an upper end of the upper mast;
the upper mast having a dogleg that offsets the hoist forward of a centerline of the lower mast;
and
a hook attached to the lower mast brace assembly proximate to the receiver;
the hinge, the lower mast brace assembly, the dogleg of the upper mast, and the hook being arranged so that a cable connected to the hoist may be used to pull the lower mast and the upper mast from the generally horizontal position to the generally vertical position.

6 more elements

A Lift Truck Hoist Attachment, comprising:

a base having at least one fork pocket;
a lower mast attached to the base by way of a hinge and pivotal between a generally vertical position and a generally horizontal position;
a lower mast brace assembly attached to the base and having a receiver configured to receive the lower mast as it is moved into the generally vertical position, and to retain the lower mast once the lower mast is in the generally vertical position;
an upper mast slidably engageable with and dis-engageable from the lower mast;
a hoist attached to an upper end of the upper mast;
and
a combination limit switch, buffer, and vertical shutoff switch attached to the upper mast proximate to the upper end of the upper mast and connected to the hoist.

4 more elements

A combination limit switch, buffer, and vertical shutoff switch for use with a hoist, comprising:

a fair lead assembly that is attached to a mounting surface by way of at least one fair lead mounting post, the fair lead assembly being configured to travel up and down along the at least one fair lead mounting post in a direction approximately tangent to a cable spool of the hoist;
at east one fair lead spring positioned over the at least one fair lead mounting post, the at least one fair lead spring being arranged to forcibly bias the fair lead assembly toward a distal end of the at least one fair lead mounting post;
a high limit switch having a high limit switch arm configured to be actuated by the fair lead assembly when the fair lead assembly travels upwards along the at least one fair lead mounting post, the high limit switch being configured to switch off the hoist when the high limit switch arm is actuated by the fair lead assembly;
and
a cable buffer being attached near the end of a cable of the hoist and being configured to engage the fair lead assembly when the cable of the hoist is nearly rewound, and upon engagement to cause the fair lead assembly to travel upwards along the at least one fair lead mounting post as the hoist further winds the cable.

2 more elements

Dependencies are inferred from the claim text.

Lift Truck Hoist Attachment

Life of this patent

Lift Truck Hoist Attachment

Life of this patent

Abstract

Claims22