Scaffold propulsion unit
First Claim
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1. A scaffold propulsion unit for use with a movable scaffold having castered columns at the four scaffold corners, said propulsion unit comprising:
- a first elongated, rigid frame member adapted to extend between the castered colums on one side of said scaffold,a second elongated, rigid frame member parallel to said first frame member and adapted to extend between the castered columns on the other side of said scaffold.means for fastening said first and second frame members to said castered columns and for holding said first and second frame members against vertical movement relative to said scaffold,a third frame member extending between said first and second frame members,first and second drive wheels mounted on said third frame member, one at either end thereof,mounting means for mounting said third frame member on said first and second frame members with the axes of rotation of said drive wheels being crosswise to the lengths of said first and second frame members and for limited free vertical movement of said drive wheels relative to said first and second frame members,a power source,first and second drive motors mounted on said third frame member,means for driving said first and second wheels in repsonse to respective energization of said first and second motors, andcontrol means for connecting and disconnecting said motors to and from said power source.
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Abstract
A propulsion unit for span scaffolds having vertical castered columns at the four corners thereof. The propulsion unit includes a first elongated frame member extending between the columns on one side of the scaffold, a second elongated frame member extending between the columns on the other side of the scaffold, and a third, wheeled, frame member extending crosswise between the first and second frame members, the third frame member being mounted on the first and second frame members for limited free vertical movement relative thereto.
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Citations
7 Claims
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1. A scaffold propulsion unit for use with a movable scaffold having castered columns at the four scaffold corners, said propulsion unit comprising:
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a first elongated, rigid frame member adapted to extend between the castered colums on one side of said scaffold, a second elongated, rigid frame member parallel to said first frame member and adapted to extend between the castered columns on the other side of said scaffold. means for fastening said first and second frame members to said castered columns and for holding said first and second frame members against vertical movement relative to said scaffold, a third frame member extending between said first and second frame members, first and second drive wheels mounted on said third frame member, one at either end thereof, mounting means for mounting said third frame member on said first and second frame members with the axes of rotation of said drive wheels being crosswise to the lengths of said first and second frame members and for limited free vertical movement of said drive wheels relative to said first and second frame members, a power source, first and second drive motors mounted on said third frame member, means for driving said first and second wheels in repsonse to respective energization of said first and second motors, and control means for connecting and disconnecting said motors to and from said power source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification