Safety lock system
AssigneeTRLI, Inc.
InventorsJohn M. Beattie, Jimmie D. Sinden
Life of this patent
Estimating the term…
Abstract
A safety lock system for use in lift apparatus to prevent tool bar members from lowering from an elevated position. The system includes vertical racks secured to tool bars, locking members, and lock release devices for simultaneously releasing the locking members from the locked position to a released position. The lock members can be released from one location.
Claims12
In lifting apparatus of the type having spaced-apart first and second tool bar members and lifting means for lifting said tool bar members, wherein the improvement comprises a safety lock system associated with said tool bar members, wherein said safety lock system comprises:
- (a) first and second vertical rack means connected to said first and second tool bar members, respectively,
- (b) first and second locking members which are movable between locked and released positions and are normally biased to said locked position;
- wherein said first and second locking members are adapted to engage said first and second rack means, respectively;
- (c) first and second spaced-apart upright support members, wherein said first tool bar member is disposed adjacent said first upright support member and said second tool bar member is disposed adjacent said second upright support member;
- and wherein said lifting means is supported by said upright support members;
- (d) lock release means operably connected to said locking members and being adapted to simultaneously move said locking members from said locked position to said released position;
- wherein said lock release means comprises:
- (1) first and second rod members vertically disposed, respectively, in said first and second upright support members and being connected to said first and second locking members, and
- (2) a horizontal rod member connected between said first and second rod members;
- wherein upward movement of said first rod member causes upward movement of said second rod member, whereby said first and second locking members are simultaneously moved to said released position.
In lifting apparatus of the type having spaced-apart first and second upright support members, first and second tool bar members associated, respectively, with said upright support members, and lifting means for lifting said tool bar members, wherein the improvement comprises a safety lock system associated with said tool bar members, wherein said safety lock system comprises:
- (a) first and second vertical rack means connected to said first and second tool bar members, respectively,
- (b) first and second locking members which are movable between locked and released positions and are normally biased to said locked position;
- wherein said first and second locking members are adapted to engage said first and second rack means, respectively;
- (c) lock release means operably connected to said locking members and being adapted to simultaneously move said locking members from said locked position to said released position;
- wherein said lock release means comprises:
- (1) first and second rod members vertically disposed, respectively, in said first and second upright support members and being connected to said first and second locking members, and
- (2) a horizontal rod member connected between said first and second rod members;
- wherein upward movement of said first rod member causes upward movement of said second rod member, whereby said first and second locking members are simultaneously moved to said released position.
Dependencies are inferred from the claim text.