A chain retractable device

Abstract

The invention provides a retracting and releasing device for a chain and belongs to the technical field of machines; the problem that a traditional hand chain tensioner is unsafe when the chain is loosened is solved by the retracting and releasing device provided by the invention. The retracting and releasing device for the chain comprises a shell of which the interior is a cavity; a revolving shaft is arranged in the shell; one end of the revolving shaft is fixedly connected with a chain wheel; the chain is twined on the chain wheel; both ends of the chain respectively extend out of the shell, and one of both ends of the chain is fixedly connected with a hook I; a worm is also axially and fixedly connected with the interior of the shell; the outer end of the worm extends out of the shell, and is connected with a handle; the other end of the revolving shaft is fixedly connected with a ratchet wheel; the revolving shaft is sheathed with a worm wheel, and the worm wheel is meshed with the worm; the side part, located on the ratchet wheel, of the worm wheel is hinged to a pawl; an elastic part for enabling the pawl to have a tendency of being embedded into ratchets of the ratchet wheel is arranged between the pawl and the worm wheel; the pawl is also provided with a shifting part; the shifting part is shifted through an external force, so that the elasticity of the elastic part can be overcome by the pawl, and the pawl is separated from the ratchets of the ratchet wheel. The retracting and releasing device for the chain has the advantages of simple in structure, and safe when the chain is loosened.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a retractable and retractable device for chains. Background technique [0002] In logistics operations, it is necessary to bundle the goods to prevent the goods being transported from being damaged or lost due to bumps and vibrations during transportation. A chain tensioner is one such tool used to tie cargo. [0003] For example, the driving mechanism of a hand chain tensioner proposed by the applicant [application number: 201220367023.2; authorized announcement number: CN202783850U], which includes a housing with a cavity inside, and a chain that can be rotated and the chain is wound inside the housing. The driving mechanism includes a rotating handle, a worm, a worm wheel and a guide. The rotating handle is axially fixed on the housing, the worm wheel is fixedly connected with the sprocket, and the worm is fixed circumferentially with the rotating handle. When meshing, the g...

AI Technical Summary

Problems solved by technology

When in use, fix the upper and lower hooks of the hand chain tensioner to tighten the goods. When the chain is manually tightened, turn the handle to further tighten the chain. force, and the force gradually increases during the process of tightening the chain; when the chain needs to be loosened, reverse the handle to disengage the worm from the worm wheel, and the force directed to the housing will slowly be consumed during this process, However, since the stroke of the worm and the worm wheel is fixed, when the worm and the worm wheel are completely disengaged, the force pointing to the housing may not be consumed. At this time, the fixed end of the chain will rush towards the housing or have a direction towards the housing. The direction is rushing towards the building, and there is a big security risk

Images