Patents Assigned to PORTAL CRANE PARTS LTD.
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Patent number: 11420850Abstract: A retracting rail clamp for braking or anchoring a rail-mounted machine such as a crane by clamping opposite sides of a longitudinal rail member, the retracting rail clamp comprising: a load transfer frame rigidly secured to the crane, such as by bolting; and a clamp mechanism suspended within the load transfer frame by at least one lateral pair of pivotally mounted lift levers, and operable through a first and second stage of motion between a raised, brake release position, in which the entirety of the rail clamp is disposed substantially vertically clear of the rail, and a lowered, brake set position wherein at least one opposed facing pair of main levers of the clamp mechanism engage the side surfaces of the rail.Type: GrantFiled: August 3, 2020Date of Patent: August 23, 2022Assignee: PORTAL CRANE PARTS LTD.Inventors: Allan Roy Murdoch, Igor Berliant
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Patent number: 10941824Abstract: An extended range, consistent force rail brake comprising an adjustable wedge assembly operatively situated between the main power spring(s) and the brake shoe(s) for selectively taking up the vertical distance that the brake shoe is required to travel between the brake release position and an initial railhead contact position. The adjustable wedge assembly is thus selectively expandable in the vertical orientation, and may comprise: an upper block that is operatively connected, either directly or indirectly, to the power spring; a lower wedge rigidly affixed to a replaceable brake shoe; and an intermediate wedge that is located by suitable bearings and/or linkages for transverse, generally horizontal slidable engagement between the upper block and the lower wedge.Type: GrantFiled: February 25, 2016Date of Patent: March 9, 2021Assignee: Portal Crane Parts Ltd.Inventors: Allan Roy Murdoch, Igor Berliant
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Patent number: 10730722Abstract: A retracting rail clamp for braking or anchoring a rail-mounted machine such as a crane by clamping opposite sides of a longitudinal rail member, the retracting rail clamp comprising: a load transfer frame rigidly secured to the crane, such as by bolting; and a clamp mechanism suspended within the load transfer frame by at least one lateral pair of pivotally mounted lift levers, and operable through a first and second stage of motion between a raised, brake release position, in which the entirety of the rail clamp is disposed substantially vertically clear of the rail, and a lowered, brake set position wherein at least one opposed facing pair of main levers of the clamp mechanism engage the side surfaces of the rail.Type: GrantFiled: February 11, 2016Date of Patent: August 4, 2020Assignee: PORTAL CRANE PARTS LTD.Inventors: Allan Roy Murdoch, Igor Berliant
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Publication number: 20190390723Abstract: Electromechanical actuator mechanisms for storm brakes are provided. The actuator mechanisms generally comprise an electro-mechanical release system and a permanent magnet eddy current brake system with adjustable air gap for varying brake setting time, and for energy dissipation of the storm brake main spring force or weight.Type: ApplicationFiled: February 9, 2017Publication date: December 26, 2019Applicant: PORTAL CRANE PARTS LTD.Inventor: Allan Roy MURDOCH
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Publication number: 20180037443Abstract: A retracting rail clamp for braking or anchoring a rail-mounted machine such as a crane by clamping opposite sides of a longitudinal rail member, the retracting rail clamp comprising: a load transfer frame rigidly secured to the crane, such as by bolting; and a clamp mechanism suspended within the load transfer frame by at least one lateral pair of pivotally mounted lift levers, and operable through a first and second stage of motion between a raised, brake release position, in which the entirety of the rail clamp is disposed substantially vertically clear of the rail, and a lowered, brake set position wherein at least one opposed facing pair of main levers of the clamp mechanism engage the side surfaces of the rail.Type: ApplicationFiled: February 11, 2016Publication date: February 8, 2018Applicant: PORTAL CRANE PARTS LTD.Inventors: Allan Roy Murdoch, Igor Berliant