Product category:
Knobs, Handles and Enclosure Hardware
News Release from: Protex Fasteners | Subject: Protex Catchbolt
Edited by the Engineeringtalk Editorial
Team on 02 August 2000
Anchoring different planes for fast
disconnection
How can you fix a vertical surface rigidly to an horizontal one, so that the union can be secured and released very quickly and easily? The solution may well be the Protex Catchbolt
How can you fix a vertical surface rigidly to an horizontal one, so that the union can be secured and released, connected and disconnected, very quickly and easily for reasons of safety, security, maintenance or high productivity? The solution for your application may well be the Protex Catchbolt with its standard, mating, in-line catchplate adapted to form a right-angled mounting bracket In one current example, this fastening solution is employed to secure a large engine cover on a Simon Gloster Saro fire truck for airfield use
This article was originally published on Engineeringtalk on 16 May 2000 at 8.00am (UK)
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In another case, it affixes a dual-purpose engine cover / companionway to a deck on board ship.
The Protex Catchbolt quick-action, overcentre fastener provides a closing force with rigidity in all three planes.
This avoids the hingeing action common to other overcentre fasteners which, since they apply a load along one axis only, cannot properly secure bonnets, covers, doors, flaps, hatches or panels.
Further reading
Stainless steel fasteners secure lifeboat lights
The versatile Protex Catchbolt in stainless steel is specified by the Royal National Lifeboat Institution to secure two folding, deck worklights fitted on RNLI Mersey and Tyne class lifeboats
Fasteners keep endurance car noses in front
The fourth consecutive victory for Protex-equipped cars at the Le Mans 24-hour race underlines the ability of the company's fasteners to meet the most arduous sports and racing car applications.
Initial closing action of the Protex Catchbolt pulls the keeper in towards the main body.
Continued operation of the lever pushes a spring-loaded bolt under the keeper and, since the bolt has a tapered nose, a positive "clamp-down" is achieved against the rubber seal it compresses.
The bolt affords excellent rigidity and alignment in all three planes.
100mm long X 45mm wide X 18mm deep, the Catchbolt in mild steel has a breaking strength of 400kgf (3.92 kN) along the longitudinal and lateral axes and 900kgf (8.82 kN) in the vertical axis.
In stainless, the values are 600kgf (5.88 kN) along longitudinal and lateral axes, 900kgf (8.82 kN) in vertical axis.
Facilities can include pin sealing, padlock, spring-loaded safety catch and, for flush fitting, a split, recessed dish.
For fastening down overhanging hatches and locker lids, Protex Fasteners offers an alternative to the abovementioned Protex Catchbolt with its right-angled catchplate.
This consists of a novel range of "reverse cranked catchplates", to accompany the Protex catalogue fastener most appropriate to the application.
A Protex "reverse cranked catchplate" is a 90-degree catchplate where the claw of the fastener engages onto the hooked end of the catchplate, and the fixing holes are at 90 degrees to the hooked end.
That principle allows the catchplate to fit around a right-angled corner, which, typically for instance, will enable a lid to be clamped onto a box - or a horizontal panel or cross-member onto a vertical surface.
On the larger sizes, such as Protex 30-Series fasteners, the mating cranked catchplate offers three different standard drops, to maximise its flexibility of application.
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