Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Tools for the Workshop

Tools for the Workshop A Selection of Notes on Recent Equipment and New and Well-tried Methods and Materials Fork Truck Developments A small truck, the E2-20/3W (FIG. 1) is a new production of Conveyancer Fork Trucks Ltd. (a division of Electro-Hydraulics Ltd.) and is three-wheeled, with the single rear wheel acting as both driver and steerer. It will carry a 2,000 lb. load, centred up to 20 in. from the heel of the forks and it will comfortably handle this load up a 10 per cent gradient or on the level at a speed of 4½ to 4¾ m.p.h. unladen. The rear-wheel drive has several important advantages: all the driving design and to fix the cutter takes only a few mechanism is in one unit and can be readily seconds. One chuck only is needed to hold the removed for servicing; the weight is where it is full range of Dedlock cutters. This is of particular wanted at the back of the truck; the front axle, importance, as up to the present time, hours, and which carries the weight, is simple and robust; even days, have been wasted with the constant and there is plenty of room for good size brakes. changing of arbors and tools in whatever machine The truck has been specially designed for opera­ is used. tion in the minimum gangway widths and it has assembly with heavy-gauge, heat-treated, high- The Dedlock chuck completely replaces the an exceptionally small outer turning radius. tensile steel channels, high-efficiency hydraulic following types of cutters: shell end mills, face The elevation of the load and the tilting of the pump giving increased battery life between charges end mills, large taper shank end mills and clutch mast are, as in all Conveyancer trucks, carried and the electrical equipment is similar to that drive end mills. The advantages over shell end out hydraulically, all cylinders being precision described for the E2-20/3W truck, except that mills and face mills are that the cutter is held honed to give long life. The high-efficiency the traction motor is fan ventilated. While still rigidly, enabling much faster feeds and speeds to electrically-driven pump is automatically started retaining the feature of neat enclosure of working be used. The Dedlock range of cutters avoids the when the lift or tilt controls are operated. parts, the covers are readily removable and this, necessity for stocking both face mills and shell A particular feature of this truck is the ease of with a convenient arrangement of the mechan­ end mills and also the considerable variety of ism, allows easy access to all parts for servicing. servicing, even though working parts are neatly arbors required to adapt the cutters to the enclosed. They are extremely accessible and, in A full range of accessories and special attach­ machine. Furthermore, the moderately priced particular, the separation of the drive from the ments is available including fork extension, load Dedlock-style cutters, which can be supplied in front axle makes attention to both these sections guards, squeeze clamps, shovels, rotating heads, various lengths, eliminate the expensive taper a simple matter. jib cranes, booms, side shifts, etc. A stacking shank, while adapters required to fit the cutters An alternative model of this truck is available unit with full free lift is also available at an to the machine are rendered unnecessary. with pneumatic tyres at a rating reduced by about extra charge. Full details can be had from the makers, 10 per cent. Both the traction and pump motors Full particulars can be obtained from Con­ Clarkson (Engineers) Ltd., Nuneaton. are totally enclosed. They are completely glass veyancer Fork Trucks Ltd. Liverpool Road, insulated and will thus stand appreciable over­ Warrington, Lanes. A Marlco Two-Speed Press loads without deterioration. There are four This new press was designed primarily for The Clarkson Dedlock Chuck speeds of traction controlled by heavy duty broaching with Marlco H.S.S. Keyway Push electro-magnetic contactors all fitted with current The autolock chuck made by Clarkson Broaches; but its rugged construction and the blow-out coils. The traction resistances are con­ (Engineers) Ltd. covered a wide range, of choice of two reductions make it suitable for a tinuously rated. The control circuit is fully inter­ smaller cutters, from 1/16 in. to 1¾ in. dia­ variety of workshop uses. The low reduction of locked between the foot master controller, revers­ meter, and has up to now been one of the few 16 : 1 is obtained by the mounting of the hand- ing switch, seat switch and brake switch. Each really efficient methods of positively holding wheel, which results in a direct drive to the ram. truck has a master-key switch. A fully water­ cutters. The new Dedlock is intended to provide By transferring the handwheel to the spindle A proofed meter indicating the state of charge of the an equally effective method of holding cutters an additional reduction gear is introduced, result­ battery, independent of load, is fitted. above 1¾ in. diameter, that is 2 in. to 6 in., in such ing in a total reduction of 50-1. The hand- a manner as positively to prevent slipping. An improved version of the 4,000 lb. Con­ wheel is locked on the appropriate spindle by veyancer is the E4-15HS/51, FIG. 1. It carries With the Dedlock (FIG. 2), the cutters lock auto­ the locking screw provided. The design lends it­ matically according to load, yet even after the a load of 4,000 lb. 15 in. from the heel of the forks self to continuous motion, a feature which is heaviest cutting a simple turn of the key releases and has a maximum speed of 6¼ m.p.h. unladen, particularly advantageous for broaching and, the tool immediately. The chuck is simple in 5½ m.p.h. fully laden, and will carry its full load as pressure can be applied with both hands, a up a 10 per cent gradient. Improvements intro­ continuous resultant force of 3,000 lb. on the duced in this model include a strengthened mast ram can be maintained throughout the stroke. The gravity force on the ram is overcome by an adjustable friction pad at the back of the top casting, which holds the ram in any position— an obvious asset when operating on a short stroke. The method of manufacture ensures vertical alignment throughout the full stroke of 16 in. and heat-treated driving gears increase the life of the tool and its overall efficiency. In addi­ tion, the bottom face of the ram is provided with a hardened pad, thus eliminating the tendency to pitting when operating under high pressures. Should any variation of the standard daylight be necessary the steel supporting columns can be replaced by others of the appropriate length. Particulars of the tool are: Daylight 16½ in., between columns 14 in. Table gaps ¾, 1, 1½, 2 and 2½ in., gap in base 3 in. Dia. of ram 2 in., length of bearing 6 in. Reduction ratios—16/1 and 50/1. Net weight 170 lb. Full particulars can be had on application to the makers, W. H. Marley & Co., 105 High Road, London, N.11. September 1951 287 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Tools for the Workshop

Aircraft Engineering and Aerospace Technology , Volume 23 (9): 1 – Sep 1, 1951
Download PDF
1 page

Loading next page...
 
/lp/emerald-publishing/tools-for-the-workshop-73tph0KI2o

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb032084
Publisher site
See Article on Publisher Site

Abstract

A Selection of Notes on Recent Equipment and New and Well-tried Methods and Materials Fork Truck Developments A small truck, the E2-20/3W (FIG. 1) is a new production of Conveyancer Fork Trucks Ltd. (a division of Electro-Hydraulics Ltd.) and is three-wheeled, with the single rear wheel acting as both driver and steerer. It will carry a 2,000 lb. load, centred up to 20 in. from the heel of the forks and it will comfortably handle this load up a 10 per cent gradient or on the level at a speed of 4½ to 4¾ m.p.h. unladen. The rear-wheel drive has several important advantages: all the driving design and to fix the cutter takes only a few mechanism is in one unit and can be readily seconds. One chuck only is needed to hold the removed for servicing; the weight is where it is full range of Dedlock cutters. This is of particular wanted at the back of the truck; the front axle, importance, as up to the present time, hours, and which carries the weight, is simple and robust; even days, have been wasted with the constant and there is plenty of room for good size brakes. changing of arbors and tools in whatever machine The truck has been specially designed for opera­ is used. tion in the minimum gangway widths and it has assembly with heavy-gauge, heat-treated, high- The Dedlock chuck completely replaces the an exceptionally small outer turning radius. tensile steel channels, high-efficiency hydraulic following types of cutters: shell end mills, face The elevation of the load and the tilting of the pump giving increased battery life between charges end mills, large taper shank end mills and clutch mast are, as in all Conveyancer trucks, carried and the electrical equipment is similar to that drive end mills. The advantages over shell end out hydraulically, all cylinders being precision described for the E2-20/3W truck, except that mills and face mills are that the cutter is held honed to give long life. The high-efficiency the traction motor is fan ventilated. While still rigidly, enabling much faster feeds and speeds to electrically-driven pump is automatically started retaining the feature of neat enclosure of working be used. The Dedlock range of cutters avoids the when the lift or tilt controls are operated. parts, the covers are readily removable and this, necessity for stocking both face mills and shell A particular feature of this truck is the ease of with a convenient arrangement of the mechan­ end mills and also the considerable variety of ism, allows easy access to all parts for servicing. servicing, even though working parts are neatly arbors required to adapt the cutters to the enclosed. They are extremely accessible and, in A full range of accessories and special attach­ machine. Furthermore, the moderately priced particular, the separation of the drive from the ments is available including fork extension, load Dedlock-style cutters, which can be supplied in front axle makes attention to both these sections guards, squeeze clamps, shovels, rotating heads, various lengths, eliminate the expensive taper a simple matter. jib cranes, booms, side shifts, etc. A stacking shank, while adapters required to fit the cutters An alternative model of this truck is available unit with full free lift is also available at an to the machine are rendered unnecessary. with pneumatic tyres at a rating reduced by about extra charge. Full details can be had from the makers, 10 per cent. Both the traction and pump motors Full particulars can be obtained from Con­ Clarkson (Engineers) Ltd., Nuneaton. are totally enclosed. They are completely glass veyancer Fork Trucks Ltd. Liverpool Road, insulated and will thus stand appreciable over­ Warrington, Lanes. A Marlco Two-Speed Press loads without deterioration. There are four This new press was designed primarily for The Clarkson Dedlock Chuck speeds of traction controlled by heavy duty broaching with Marlco H.S.S. Keyway Push electro-magnetic contactors all fitted with current The autolock chuck made by Clarkson Broaches; but its rugged construction and the blow-out coils. The traction resistances are con­ (Engineers) Ltd. covered a wide range, of choice of two reductions make it suitable for a tinuously rated. The control circuit is fully inter­ smaller cutters, from 1/16 in. to 1¾ in. dia­ variety of workshop uses. The low reduction of locked between the foot master controller, revers­ meter, and has up to now been one of the few 16 : 1 is obtained by the mounting of the hand- ing switch, seat switch and brake switch. Each really efficient methods of positively holding wheel, which results in a direct drive to the ram. truck has a master-key switch. A fully water­ cutters. The new Dedlock is intended to provide By transferring the handwheel to the spindle A proofed meter indicating the state of charge of the an equally effective method of holding cutters an additional reduction gear is introduced, result­ battery, independent of load, is fitted. above 1¾ in. diameter, that is 2 in. to 6 in., in such ing in a total reduction of 50-1. The hand- a manner as positively to prevent slipping. An improved version of the 4,000 lb. Con­ wheel is locked on the appropriate spindle by veyancer is the E4-15HS/51, FIG. 1. It carries With the Dedlock (FIG. 2), the cutters lock auto­ the locking screw provided. The design lends it­ matically according to load, yet even after the a load of 4,000 lb. 15 in. from the heel of the forks self to continuous motion, a feature which is heaviest cutting a simple turn of the key releases and has a maximum speed of 6¼ m.p.h. unladen, particularly advantageous for broaching and, the tool immediately. The chuck is simple in 5½ m.p.h. fully laden, and will carry its full load as pressure can be applied with both hands, a up a 10 per cent gradient. Improvements intro­ continuous resultant force of 3,000 lb. on the duced in this model include a strengthened mast ram can be maintained throughout the stroke. The gravity force on the ram is overcome by an adjustable friction pad at the back of the top casting, which holds the ram in any position— an obvious asset when operating on a short stroke. The method of manufacture ensures vertical alignment throughout the full stroke of 16 in. and heat-treated driving gears increase the life of the tool and its overall efficiency. In addi­ tion, the bottom face of the ram is provided with a hardened pad, thus eliminating the tendency to pitting when operating under high pressures. Should any variation of the standard daylight be necessary the steel supporting columns can be replaced by others of the appropriate length. Particulars of the tool are: Daylight 16½ in., between columns 14 in. Table gaps ¾, 1, 1½, 2 and 2½ in., gap in base 3 in. Dia. of ram 2 in., length of bearing 6 in. Reduction ratios—16/1 and 50/1. Net weight 170 lb. Full particulars can be had on application to the makers, W. H. Marley & Co., 105 High Road, London, N.11. September 1951 287

Journal

Aircraft Engineering and Aerospace Technology – Emerald Publishing

Published: Sep 1, 1951

There are no references for this article.