Commercial lifting device-power unit with safety mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 27, 2018
Issued Date -
N/A
app pub date -
Nov 4, 2013
filing date -
Nov 4, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power unit (or a hydraulic floor jack) includes a rectangular frame with side flanges and has a tubular handle enclosing a control shaft and a control knob. A pivotal lifting mechanism is mounted on the frame including a pair of parallel lift arms having rearward ends interconnected by a lateral push bar. The forward ends (with the bridge) are rotatable upward for lifting a load as the push bar is translated forward within a pair of U channels tracks attached to the inner side flanges. A hydraulic cylinder has a ram for pushing the lateral push bar forward along the tracks for raising the forward ends of the lift arms, and has a releasable control valve for retracting the ram to lower the forward ends of the lift arms. The safety mechanism includes a toothed rack bar secured in the vertical wall of the racks. The lateral push bar has bore holes in the ends thereof. A cylindrical dog is slidably supported within each of the bore holes ad has a proximal end that is extendable for engaging a tooth of the rack bar. The dogs are biased into the extended position, and include release cables and linkage for releasing the dogs from the rack bar by rotating the control knob counter-clockwise.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully