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Manual Screw Jack

Model: JT,JTW,JTM,JTB,JTC,JTS
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Place of Origin: Made In China
Brand Name: JACTON
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Description:
Manual Screw Jack Descriptions
Manual screw jack is ideal solutions for applications where electricity or power generators is inconvenient or dangerous, light weight, low duty cycle, low target cost and short travel length. 


Manual screw jack is composed of hand wheel or hand crank and a worm gear screw jack, which has intermittent precisely positioning and self-locking feature for no creeping down without brake mechanism or other locking systems, when manual ball screw jack, no self-locking feature, avoid ball screw back drive with attached load, which needs additional brake mechanism or other locking system to prevent it creep. Standard hand wheel dimensions from 5" to 20" diameter, larger diameter required, consulting JACTON sales. 

Manual worm gear screw jack has a disadvantage, slow travel speed, maximum 1 to 1.5 mm travel length per full turn of hand wheel or hand crank. But manual bevel gear screw jack is ideal solution of slow travel speed with internal pairs spiral bevel gears drive, maximum up to 12mm travel length per full turn of hand wheel or hand crank. When you required manual screw jack, but need quick lifting speed, bevel gear screw jack will be the best choice.

When manual screw jack needs precise position display, a range of digital position indicators are available. These digital position indicators measure the rotations of the input shaft and display corresponding position in the digital counter window. The display value per input shaft revolution is variable and is achieved through a series of gear reductions configured to accommodate different worm gear screw jack ratios, screw pitch and travel length.

Manual Screw Jack Calculation Formulas
Hand Manual Force Calculation Formulas

F=(GxP) / (ixR)

F: hand manual force (kg)
G: load capacity (kg)
P: lifting screw pitch (mm)
i: worm gear reduction ratio
R: hand wheel or hand crank radius (mm)

Travel Stroke Calculation Formulas
1. L=n x P/i
L: travel stroke (mm)
n: numbers of hand wheel or hand crank full turns
P: lifting screw pitch (mm)
i: worm gear reduction ratio
2. L1= P/i
L1: travel stroke per turn of input shaft
P: lifting screw pitch (mm)
i: worm gear reduction ratio

Hand Wheels or Hand Crank Dimensions
Cast Iron Hand Wheel Picture and Drawing


Bakelite Hand Wheel Picture and Drawing


Reinforced Nylon Hand Crank Picture and Drawing

Previous Product:Motorised Screw Jack
Product List
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JTW Worm Screw Jack
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Ball Screw Jack
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JTS Bevel Gear Jack
Miter Gearbox
JT Miter Gearbox
JTP Miter Gearbox
JTV Miter Gearbox
JTA Miter Gearbox
System Accessories
Screw Jack System
Application
Jacton Electromechanical Co.,Ltd.
Contact: Warren Lee
Skype: jactonjack
T: 86-769-81585852
F: 86-769-81620195
E: sales@screw-jack.com
W: www.screw-jack.com

Office 1118, Taibao Business Building, No.1 Langwei Road, Xinan, Changan, Dongguan, Guangdong, China    Phone: 86-769-81585852 | Fax: 86-769-81620195
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