Tools – Wrench – screwdriver – or driver therefor – Sliding jaw – handle-lever grip
Patent
1990-04-26
1991-09-24
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Sliding jaw, handle-lever grip
81358, 81135, B25B 1312
Patent
active
050504657
DESCRIPTION:
BRIEF SUMMARY
Heretofore, various types of pliers devices have been known which are constructed with a stationary pliers member with an associated jaw member and a movable pliers member with a second jaw member wherein the movable pliers member is movable relative to the stationary pliers member so as to move the two jaw members relative to each other. Generally, movement of the movable pliers member is effected by means of an actuating handle which can be pivotally mounted on the stationary pliers member.
Briefly, the invention provides a pliers device having a first pliers member with a first jaw member, a second pliers member movably mounted in the first pliers member and having a second jaw member opposite the first jaw member and an actuating handle pivotally mounted on the first pliers member. In addition, a first actuating means is provided between the handle and the second pliers member for moving the second pliers member relative to the first pliers member in response to pivoting of the handle in order to move the jaw members toward each other to close on an object therebetween. In addition, a second actuating means is provided between the handle and the second pliers member for moving this member relative to the first pliers member in response to pivoting of the handle in order to move the jaw members toward each other to exert a clamping force on an object held therebetween.
In accordance with the invention, the pliers device is easy to rearrange from an inactive position to a clamp engaging position in a first phase of a movement operation and which thereafter, in a second movement operation, are easy to adjust with a desired readily regulatable holding force and/or a desired readily regulatable clamping force.
The pliers according to the invention can find different forms of application. In a first case, the pliers can be utilised as a tool for clamping together an object with a relatively large clamping force, for example as nutcrackers for cracking nuts, and then especially cracking nuts with mutually different dimensions, but with an equal or substantially equal clamping force. In a second case, the pliers can be employed as holding means, where the clamping force does not necessarily need to be especially large, but on the other hand can be maintained at a stable and uniform level, for example for securing a work piece and/or securing a ground wire in connection with an electrical welding operation. In the last-mentioned case, the aim is especially pliers, which in a relatively simple and rapid manner can establish reliable earthing contact in a work piece via the pliers, at the same time as the pliers shall be able to support the weight of an earth cable of large dimensions. In addition, the aim is to employ the pliers for conventional clamping and holding operations in connection with various working operations, for example within mechanical industry, within the plumbing trade, etc.
The pliers device according to the invention is characterised in that the second jaw member is moveable towards the first jaw member in a two-step actuating operation, that is to say a first step with a relatively, comparatively long length of movement between the jaw members and with relatively small force, by means of a first actuating means between the actuating handle and the moveable pliers member and a second step without relative movement or with a moderate relative movement with relatively short length of movement and with relatively large force, by means of a second actuating means between the actuating handle and the moveable pliers member.
In this way pliers are obtained, where the two-step movements form part of a coherent movement of the actuating handle and where the jaw members are first automatically adjusted into engagement with the object which is to be secured/clamped, independently of the thickness of the object which the pliers are to engage with, and where thereafter there is directly exerted a suitable holding force or a suitable clamping force, substantially independent of the size of the object whi
REFERENCES:
patent: 901174 (1908-10-01), Johnson
patent: 1082601 (1913-12-01), McCarthy
patent: 1440346 (1922-12-01), Eshelman
patent: 2112873 (1938-04-01), Wright
patent: 2313270 (1943-03-01), Sapp
patent: 2906155 (1959-09-01), Miller
patent: 3253487 (1966-05-01), Bentley
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