Meshing chain stopper

Patent metadata

Field	Value
Publication number	US-9243686-B2
Application number	US-201113978278-A
Country	US
Kind code	B2
Filing date	Dec 12, 2011
Priority date	Jan 5, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

Chain detachment and chain entry are avoided, and a process for setting the length of a meshing chain is avoided, while the chain feed length can also be freely changed. A meshing chain stopper ( 190 L) comprises a meshing chain stopper attachment part ( 191 ) and a contact-stop protrusion ( 192 ). The contact-stop protrusion ( 192 ) is contact-stopped at a contact-stop point ( 173 A) provided on the periphery of a chain locus (L) when a pair of meshing chains ( 150, 150 ) are being driven.

First claim

The invention claimed is:

1. An interlocking chain type lift device, comprising:
an interlocking chain comprising first and second hook-shaped inner tooth plates and first and second hook-shaped outer tooth plates, wherein a clearance area is provided between the first and second hook-shaped inner tooth plates;
wherein the first and second hook-shaped inner tooth plates are located away from each other in a width direction of said interlocking chain and are connected to each other by first and second connecting pins press-fit into first and second bushings provided in the inner tooth plates;
the first hook-shaped outer tooth plate arranged adjacent to an outer side of the first hook-shaped inner tooth plate, and the second hook-shaped outer tooth plate arranged adjacent to an outer side of the second hook-shaped inner tooth plate;
the first and second hook-shaped outer tooth plates arranged alternately with the hook-shaped inner tooth plates with respect to the first and second connecting pins in a chain longitudinal direction and wherein each of the first and the second connecting pins are press-fit into at least one inner tooth plate and at least one outer tooth plate;
the interlocking chain adapted for interconnection with a second interlocking chain to become rigid, and adapted to bifurcate from said second interlocking chain;
an interlocking chain stopper provided in said clearance area of said interlocking chain, the interlocking chain stopper comprising a contact-stop protrusion and an interlocking chain stopper mounting portion;
the contact-stop protrusion protruding from the interlocking chain stopper mounting portion outside the hook-shaped inner tooth plates and the hook-shaped outer tooth plates and toward an inner side of a chain locus provided when at least a first hook-shaped inner tooth plate and a first hook-shaped out tooth plate rotate relative to each other during driving of the interlocking chain; and
wherein the contact-stop protrusion is brought into contact with and stopped by a contact-stop point provided on a chain guide plate of the interlocking chain type lift device during driving of the interlocking chain.

2. The interlocking chain type lift device according to claim 1 , wherein the interlocking chain stopper mounting portion comprising:
an inner peripheral face into which one of first and second connecting pins is received,
a U-shaped mounting portion for at least partially surrounding at least one of the first and second bushings; and
paired straight leg portions, which extend along the chain locus of the interlocking chain from the U-shaped mounting portion and on opposite sides of at least one of the first and second connecting pins.

3. The interlocking chain type lift device according to claim 2 , wherein the paired straight leg portions respectively extend from the first connecting pin to the second connecting pin.

4. The interlocking chain type lift device according to claim 2 , wherein
an outer face of the U-shaped mounting portion and an inner peripheral face of the U-shaped mounting portion overlap arcs of two concentric circles about a center of the one connecting pin in an imaginary plane intersecting a center line of the first connecting pin, and
a thickness of the U-shaped mounting portion is set such that the U-shaped mounting portion can be fitted between i) the bushing in contact with the inner peripheral face of the U-shaped mounting portion or the roller fitted over the bushing and ii) the bushing or the roller adjacent to the bushing in contact with the inner peripheral face of the U-shaped mounting portion or the roller fitted over the bushing.

5. The interlocking chain type lift device according to claim 4 , wherein the outer face of the U-shaped mounting portion is formed by an outer arc face facing the direction toward the inner side of the chain locus when the interlocking chain bends, and an outer flat face that faces in a direction toward an outer side of the chain locus when the interlocking chain bends and is continuous from the outer arc face.

6. A chain stopper adapted to be provided in a clearance area of an interlocking chain device, the chain stopper comprising:
a contact-stop protrusion adapted to contact a contact-stop point provided on an interlocking chain device;
an interlocking chain stopper mounting portion;
the contact-stop protrusion protruding from the interlocking chain stopper mounting portion and adapted to extend toward an inner side of a radius of curvature of an interlocking chain device; and
the interlocking chain stopper mounting portion comprising an inner peripheral face with a U-shaped mounting portion having straight leg portions, the inner peripheral face adapted to receive a pin of an interlocking chain device.

Assignees

• Saji Tomoyuki
• Tsubakimoto Chain Co

Inventors

• Saji Tomoyuki

Classifications

• F16G13/06

  with links connected by parallel driving-pins with or without rollers {so-called open links} · CPC title

• F16G15/00 Primary

  Chain couplings, Shackles; Chain joints; Chain links; Chain bushes (making chain elements B21L) · CPC title

• B66F3/06 Primary

  with racks comprising pivotable toothed sections or segments, e.g. arranged in pairs · CPC title

• F16G13/20

  stiff; Push-pull chains · CPC title

• B66F17/00 Primary

  Safety devices, e.g. for limiting or indicating lifting force · CPC title