Tool of the pliers-type
AssigneeC. A. Weidmuller GmbH & Co.
InventorHans Undin
Life of this patent
Estimating the term…
Abstract
A tool with two elongated handles and two jaws operatively connected to the handles is provided with a mechanism for preventing premature opening of the handles and jaws. The mechanism comprises a pawl operating as a bistable rocker and engaging, with one or with two engagement means, an engagement member defined by two projections delimitating an operational area, or by at least one row of teeth with which each of the two engagement means is alternately engageable, so as to prevent premature interruption of the closing movement and preferably also of the reverse opening movement of the handles and of the jaws.
Claims20
A tool of the pliers-type, having two elongated handles;
- two jaws operably connected to the handles for performing a closing movement and an opening movement, and a mechanism preventing premature interruption of the said closing movement, said mechanism comprising an engagement member connected to at least one of said handles, and a pawl member pivotally mounted on a pivot pin which is connected with the first one of said handles, said pawl member being constantly affected, in a first fixing point, by a spring means so as to operate as a bistable rocker swingable between two opposite lateral positions, said pawl member comprising an engagement part with a means of engagement with said engagement member, and an actuating part on which said first fixing point is located, said spring means being further anchored in a second fixing point, connected to the said first handle, wherein
- said engagement part is defined by an elongated engagement arm extending, in a direction transverse to a line connecting said pivot pin and said first fixing point, between a first end attached to the actuating part, and free second end;
- said means of engagement is defined by a rearwardly pointing cog, having an engagement edge, and located at said free end;
- a forwardly pointing second cog is provided at said first end;
- said engagement member is defined by a forward projection and a rearward projection which are rigidly connected to the second handle, point with their top portions toward the first handle, and are spaced one from another so as to define between them an operating area for the said engagement arm;
- said rearward projection is at its top portion provided with a first tooth pointing toward the forward projection and having an engagement edge facing the said engagement edge of said first cog and being shaped for engagement therewith;
- said top portion of said forward projection is defined by a point alternately engageable with said engagement arm and said second cog to swing the pawl member from one side position to the other one and vice versa.
A tool of the pliers-type, having two elongated handles, two jaws operably connected to the handles for executing a closing movement and an opening movement, and a mechanism preventing premature interruption of said closing movement, said mechanism comprising an engagement member connected to at least one of said handles, and a pawl member pivotally mounted on a pivot pin which is connected with the first one of said handles, said pawl member being constantly affected, in a first point of attachment, by a spring means so as to operate as a bistable rocker swingable between two opposite lateral positions, said pawl member comprising an engagement part with a means of engagement with said engagement member, and an actuating part comprising said first fixing point, and said spring means being further anchored in a second fixing point, connected to the said first handle, wherein
- the engagement member is defined by at least one row of teeth having an end stop at least one end;
- a second end stop is provided adjacent the opposite end of said row of teeth;
- the engagement part of the pawl member has two spacedly disposed engagement means for alternate engagement, in dependence on the present lateral position of the pawl member, with said engagement member, each of the said engagement means allowing a movement of the engagement member relative to the pawl member only in a direction opposite to the direction tolerated by the other engagement means, and
- each said engagement means being adapted to swing, upon impact with one of said end stops, the pawl member into its opposite lateral position.
Dependencies are inferred from the claim text.