Misaligned locking and releasing ratchet mechanism and ratchet clamp

Patent metadata

Field	Value
Publication number	US-10792790-B2
Application number	US-201715546807-A
Country	US
Kind code	B2
Filing date	Jan 4, 2017
Priority date	Jan 4, 2017
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

The present invention discloses a ratchet clamp comprising a first clamping arm and a second clamping arm which are pivotally connected with each other via a connecting shaft so as to be opened and closed relative to each other, a ratchet assembly, a swing assembly and a control assembly provided between the first clamping arm and the second clamping arm; the ratchet toothed assembly has a plurality of first ratchet teeth and a plurality of second ratchet teeth which are juxtaposed and are misaligned with each other; the swing assembly and the ratchet toothed assembly are moved away from or towards each other with the connecting shaft as the axial center of rotation; a latch member of the control assembly has at least a first pawl and at least a second pawl, a wrench member of the control assembly is used for toggling the latch member to be moved, the first pawls and the second pawls are respectively engaged with the corresponding first ratchet teeth and second ratchet teeth when the latch member is moved to an engaged position, and the first pawls and the second pawls are respectively moved away from the corresponding first ratchet teeth and the second ratchet teeth when the latch member is moved to a released position. With the misaligned ratchet tooth design, the tooth profile may not be reduced, thereby increasing the structural strength, so that the overall clamping force is greatly enhanced.

First claim

The invention claimed is:

1. A ratchet clamp comprising a first clamping arm, a second clamping arm and a ratchet mechanism, the first clamping arm and the second clamping arm are pivotally connected to each other via a connecting shaft so as to be opened and closed relative to each other, the ratchet mechanism is provided between the first clamping arm and the second clamping arm, wherein:
the ratchet mechanism comprises:
a ratchet toothed assembly provided on the first clamping arm, the ratchet toothed assembly comprising a plurality of racks, each of the plurality of racks having a plurality of ratchet teeth, the ratchet teeth on different ones of the plurality of racks are juxtaposed and misaligned with each other;
a swing assembly provided on the second clamping arm, the first clamping arm and the second clamping arm respectively drive the swing assembly and the ratchet toothed assembly to move away from or towards each other with the connecting shaft as an axial center of rotation; and
a control assembly having a latch portion and a trigger portion, the latch portion having a plurality of pawls, each of the plurality of pawls having at least one ratchet-tooth, wherein the ratchet tooth on different ones of the plurality of pawls are juxtaposed and misaligned with each other; and the trigger portion is used for toggling the control member, so that the pawls of the latch portion and the racks of the ratchet toothed assembly are moved between an engaged position and a released position;
one or more of the ratchet teeth on only one of the plurality of racks are engaged with a corresponding one or more ratchet teeth of the pawls and other of plurality of racks are not engaged with corresponding ratchet teeth of the pawls when the latch portion is moved to the engaged position, and all of the racks and the pawls are simultaneously released when the latch portion is moved to the released position; and
an elastic component provided between the trigger portion and the second clamping arm so that the ratchet teeth on at least one of the plurality of racks and a corresponding one or more ratchet teeth of the pawls are held in engagement.

2. The ratchet clamp according to claim 1 , wherein the latch portion comprising a plurality of latch members, each of the pawls being provided on each of the latch members respectively, and the trigger portion comprising a plurality of wrench members,
wherein each of the wrench members has a protrusion and each of the latch members has an indentation,
wherein the protrusion is used for being embedded into the indentation, and the protrusion toggles the latch member within the indentation to be rotationally displaced when the wrench member is rotationally displaced.

3. The ratchet clamp according to claim 1 , wherein the connecting shaft is sleeved with a torsion spring, the two ends of the torsion spring abut against the first clamping arm and the second clamping arm, respectively, the first clamping arm and the second clamping arm are normally held in an open position by means of elastic force of the torsion spring, the swing assembly is pivotally connected to the second clamping arm via a first shaft through which the swing assembly is braked to be moved along with the second clamping arm, the ratchet toothed assembly is pivotally connected to the first clamping arm via a second shaft and a third shaft through which the ratchet toothed assembly is braked to be moved along with the first clamping arm.

4. The ratchet clamp according to claim 2 , wherein the swing assembly comprises:
a guide groove formed on one side of the swing assembly for the ratchet toothed assembly to slide therein, the ratchet toothed assembly is arcuate strip-shaped, the shape of the guide groove matches the shape of the ratchet toothed assembly, so that the ratchet toothed assembly slides in the guide groove in an arcuate path;
a receiving groove formed on the other side of the swing assembly for the control assembly to be pivotally provided therein; and
an opening provided between the guide groove and the receiving groove for the guide groove and the receiving groove to communicate with each other, the plurality of ratchet teeth extend through the opening into the receiving groove when the ratchet toothed assembly is placed into the guide groove, so that the plurality of ratchet teeth correspond to the pawls.

5. The ratchet clamp according to claim 4 , wherein the plurality of pawls comprises a first pawl and a second pawl, and the plurality of racks comprises a first rack and a second rack correspond to the first pawl and the second pawl respectively, and only one pair of the racks and pawls is engaged and the other pair is not engaged when the latch member is moved to the engaged position, and the two pairs of racks and pawls are simultaneously released when the latch member is moved to the released position.

6. The ratchet clamp according to claim 5 , wherein
a plurality of first ratchet teeth are provided on the first rack, and a plurality of second ratchet teeth are provided on the second rack, wherein
the plurality of first ratchet teeth of the first rack and the plurality of second ratchet teeth of the second rack extend through the opening into the receiving groove when the ratchet toothed assembly is placed into the guide groove, so that the plurality of first ratchet teeth of the first rack correspond to the first pawl and the plurality of second ratchet teeth of the second rack correspond to the second pawl.

7. The ratchet clamp according to claim 6 , wherein the second rack is in parallel with the first rack, and
the first rack and the second rack are both arcuate strip-shaped, and
the arc centers of the first rack and the second rack coincide with the circle center of the connecting shaft.

8. The ratchet clamp according to claim 6 , wherein the plurality of first ratchet teeth each have a first ratchet tooth tip end and a first ratchet tooth groove end, and the plurality of second ratchet teeth each have a second ratchet tooth tip end and a second ratchet tooth groove end, each of the first ratchet tooth tip ends and each of the second ratchet tooth groove ends are in parallel with each other, and each of the first ratchet tooth groove ends and each of the second ratchet tooth tip ends are in parallel with each other.

9. The ratchet clamp according to claim 1 , wherein the trigger portion comprises:
a first wrench member;
a second wrench member, and the first wrench member and the second wrench member are respectively pivotally connected to the swing assembly via a fourth shaft, and the first wrench member and the second wrench member are respectively driven to be rotationally displaced with the fourth shaft as a center of rotation; and
the latch portion comprises:
a first latch member on which a first pawl of the plurality of pawls of the latch portion are provided; and
a second latch member on which a second pawl of the plurality of pawls of the latch portion are provided; wherein the first latch member and the second latch member are respectively pivotally connected to the swing assembly via a fifth shaft, and the first latch member and the second latch member are respectively driven to be rotationally displaced with the fifth shaft as the center of rotation.

10. The ratchet clamp according to claim 9 , wherein the first wrench member has a first protrusion for being embedded into a first indentation of the first latch member, and the second wrench member has a second protrusion for being embedded into a second indentation of the second latch member, wherein the first protrusion toggles the first latch member within the first indentation to be rotationally displaced and the second pr

Assignees

• Hangzhou Great Star Ind Co Ltd
• Hangzhou Great Star Tools Co Ltd

Inventors

• Li Yueming

Classifications

• B25B5/16 Primary

  Details, e.g. jaws, jaw attachments · CPC title

• B25B7/14

  Locking means {(B25B7/123 takes precedence)} · CPC title

• B25B5/06 Primary

  Arrangements for positively actuating jaws · CPC title

• B25B7/123

  with self-locking toggle levers · CPC title