Cable draw mechanism for cable trays

Claim 2

A cable draw mechanism for a runged cable tray and the like, said mechanism comprising an elongated frame, rung-engaging means mounted on said frame adjacent each end thereof, a cable pulley rotatably mounted on said frame adjacent each end thereof, a cable pulley rotatably mounted on said frame at a position intermediate said rung-engaging means, said pulley being shaped for insertion between an adjacent pair of rungs forming part of said cable tray, said rung-engaging means being shaped for engaging said rungs from a given same directions, and mounting means for mounting said pulley at an inserted position spaced from said rungs, said mounting means being shaped for relatively loose insertion between said rungs to permit limited longitudinal movement of said frame to engage said rungs and said rungengaging means respectively.

Claim 3

The combination according to claim 1 wherein said rung engaging means include a pair of channel members, the open sides of said channel members facing generally in the same direction.

Claim 4

The combination according to claim 2 wherein said frame is fabricated from a pair of spaced longitudinal supports 12 joined at their adjacent ends respectively by said channel members 16.

Claim 5

The combination according to claim 3 wherein said pulley extends transversely of said supports and substantially across the space therebetween.

Claim 6

The combination according to claim 2 wherein said channel members each have inwardly extending reinforcing lip means extending along the lengths thereof, said lip means in addition at least aiding the retention of said channel members on said rungs.

Claim 7

The combination according to claim 2 wherein a dog 42 is pivotally mounted on each of said channel members for angular displacement relative to the open side of said channel members.

Claim 8

The combination according to claim 6 wherein said dogs are eccentrically pivoted so as to be angularly displaceable by gravity across said open sides when said frame is in a more or less horizontal position.

Claim 9

A cable draw mechanism for a runged cable tray and the like, said mechanism comprising an elongated frame, rung engaging means mounted on said frame adjacent each end thereof, a cable pulley rotatably mounted on said frame at a position intermediate said rung-engaging means, said pulley being shaped for insertion between an adjacent pair of rungs forming part of said cable tray, said rung engaging means including a pair of channel members, the open sides of said channel members facing generally in the same direction, and an additional rung-engaging channel member secured back to back to each of said first-mentioned channel members.

Claim 10

A cable draw mechanism for a runged cable tray and the like, said mechanism comprising an elongated frame, rung engaging means mounted on said frame adjacent each end thereof, a cable pulley rotatably mounted on said frame at a position intermediate said rung-engaging means, said pulley being shaped for insertion between an adjacent pair of rungs forming part of said cable tray, said rung engaging means including a pair of channel members, the open sides of said channel members facing generally in the same direction, and an additional rung-engaging channel member secured back to back to each of said first-mentioned channel members.

Claim 11

The combination according to claim 4 wherein said pulley-mounting means include a pair of brackets erected respectively from said support members.

Claim 12

The combination according to claim 9 wherein said brackets are secured adjacent apposed edges respectively of said supports and are each provided with an array 24 of apertures, said arrays of apertures being transversely aligned for rotatably supporting said pulley at a selected elevation relative to said supports.

Claim 13

The combination according to claim 1 wherein rung-engaging means are spaced on said frame a distance equivalent to a common denominator of rung spacings in a number of cable trays having respectively differing rung spacings.

Claim 14

A cable tray and draw mechanism therefor comprising a plurality of transverse supports forming part of said cable tray and defining spaced openings in the back or bottom thereof, said draw mechanism including an elongated frame, support-engaging means mounted on said frame adjacent each end thereof, a cable pulley mounted on said frame at a position generally between said support-engaGing means, said pulley being shaped for insertion through a selected one of said openings, said support-engaging means being shaped for engaging said supports from a given same direction, and mounting means for mounting said pulley at an inserted position spaced from said supports, said supporting means being shaped for loose insertion between said supports to permit limited longitudinal movement of said frame to engage said supports and said support engaging means respectively.

Claim 15

A cable tray and draw mechanism therefor comprising a plurality of transverse supports forming part of said cable tray and defining spaced openings in the back or bottom thereof, said draw mechanism including an elongated frame, support-engaging means mounted on said frame adjacent each end thereof, a cable pulley mounted on said frame at a position generally between said support-engaGing means, said pulley being shaped for insertion through a selected one of said openings, said support-engaging means being shaped for engaging said supports from a given same direction, and mounting means for mounting said pulley at an inserted position spaced from said supports, said supporting means being shaped for loose insertion between said supports to permit limited longitudinal movement of said frame to engage said supports and said support engaging means respectively.

Claim 16

A cable tray and draw mechanism therefor comprising a plurality of transverse supports forming part of said cable tray and defining spaced openings in the back or bottom thereof, said draw mechanism including an elongated frame, support-engaging means mounted on said frame adjacent each end thereof, a cable pulley mounted on said frame at a position generally between said support-engaging means, said pulley being shaped for insertion through a selected one of said openings, said tray supports and said tray openings extending uninterruptedly and transversely across said tray, said draw mechanism being substantially narrower than said cable tray, and said support-engaging means being spaced similarly with respect to selected ones of said tray supports and being shaped for sliding engagement with said tray supports respectively so that said frame can be slidably indexed across the width of said cable tray.

Claim 17

A cable tray and draw mechanism therefor comprising a plurality of transverse supports forming part of said cable tray and defining spaced openings in the back or bottom thereof, said draw mechanism including an elongated frame, support-engaging means mounted on said frame adjacent each end thereof, a cable pulley mounted on said frame at a position generally between said support-engaging means, said pulley being shaped for insertion through a selected one of said openings, said tray supports and said tray openings extending uninterruptedly and transversely across said tray, said draw mechanism being substantially narrower than said cable tray, and said support-engaging means being spaced similarly with respect to selected ones of said tray supports and being shaped for sliding engagement with said tray supports respectively so that said frame can be slidably indexed across the width of said cable tray.

Claim 18

The combination according to claim 11 wherein said pulley is so positioned along the length of said frame as to be insertable between an adjacent pair of rungs irrespective of a particular size of said rung spacings.