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A spring hand grip is used in bursts and stored in a gym bag, and its handle takes the worst of both: sweat, repeated full-force squeezing, and friction against whatever is around it. The handle set shown here is for a spring-powered gripper: a curved hard-plastic base with a soft grip overmoulded in a second shot, plus the matching lever arm that carries the spring end.
The photographs show the handle alone, the handle and lever together, and the assembled pair. The connection ends are moulded cylindrical seats, and the grip zone along the curve carries a textured soft surface where the hand actually lands.
A hard handle forces the fingers to do all the friction work, and they tire long before the spring does. The soft band over the curve does three jobs at once: it adds friction so the grip needs less clamping force, it spreads the pressure over the fingers, and it takes the wear that would otherwise polish and crack the hard substrate. It is moulded onto the handle in a vertical injection second shot, flowing through mechanical locks in the substrate rather than relying on adhesion.
Texturing the soft surface is part of the design, not decoration. The raised pattern increases friction and hides the sheen that a flat soft surface develops after weeks of use. The pattern is formed by the tool, so it repeats exactly across the production run.
Both the handle and the lever carry a cylindrical seat at their closing end, and those seats are the parts that see the load. The spring pushes with every squeeze and pulls back on release, thousands of cycles at whatever force the user chooses. The seat walls are thickened behind the spring coil, and the geometry is taken from the actual spring, not from a nominal diameter, because a seat that lets the coil wander makes the grip feel loose at the top of every stroke.
This is the reason we ask for the spring specification with the handle drawing. Seat depth, wall thickness and the relationship between the two seats in the closed position all come from the spring, and they decide whether the assembled gripper feels even through the stroke or pulls to one side.
The curve itself is a tooling decision. A curved handle parts from its mould along a curved split line, which is more work in the tool than a straight pull, but it is what puts the grip surface where the closed hand wants it. Getting the parting line right keeps the seam out of the grip zone, because a seam line exactly where the fingers squeeze is felt immediately and reads as a defect.
The hard substrate is moulded first, in a layout that leaves the grip zone clean for the second shot. Where the soft material meets the hard one, the boundary is stepped and locked so the two materials cannot separate under the peeling load of a hand twisting on the grip.
Bond strength between grip and substrate, checked by twisting and peeling a sample from each lot. Spring seat dimensions against the actual spring, and the assembled feel through the full stroke. Texture definition in the soft surface. Colour and surface finish of the substrate against the approved master.
Kunshan Maifeng Precision Industry Co., Ltd. reviews sporting goods and overmolded handle designs before quoting, builds the injection molds in house, and molds single-color and dual-color parts on 36 machines from 90 to 700 tons. Send us the spring specification and the handle layout, and we will come back with a feasibility comment and a tooling proposal.
Kunshan Maifeng Precision Industry Co., Ltd. (MIF) has an investment of RMB 35 million and an independent factory of more than 5,000 m². The company operates 36 single- and dual-color injection molding machines from 90 to 700 tons, together with more than 50 sets of mold manufacturing and processing equipment. Our service, management and production team includes over 100 people.
Our parent company was established in 2008. We provide product design, mold design and manufacturing, injection molding and product assembly services for custom plastic parts, supporting both domestic and international customers.
1. Product Design
Product structure design and optimization based on customer drawings and samples.
2. Mold Design
Mold design developed around product geometry, material and production requirements.
3. Mold Manufacturing
Machining, polishing, fitting and assembly for custom injection molds.
4. Injection Molding
Single- and dual-color injection molding for project and order requirements.
5. Product Assembly
Supporting assembly services for molded plastic components.
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