Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1995-06-07
1997-06-17
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Machine
811776, 811772, B25B 1300, B25G 102
Patent
active
056387261
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hand tool for screwing and unscrewing a screw means. Such a tool is known by SE 467 532 and is shown in the attached FIGS. 1-4.
In this known tool, a flexible shaft is rotatable and displaceable in an angled tube. A handle is fixed to the rear end of the shaft to operate the same. To the front end of the shaft, there is fixed an engaging means with a hexagonal cross section. To the front end of the tube, there is fixed a holder with a hexagonal socket for receiving the engaging means in non-rotational relation. When the engaging means is to be rotated with the aid of the handle, the engaging means is pressed out to a free position outside the holder and at the same time a portion of the shaft will be exposed outside the holder. If the engaging means is subjected to lateral forces, these will be taken up at the fixing point between the shaft end and the engaging means with the risk of fracture at the point of attachment. If the engaging means is also extended with another engaging means, the lateral forces will have a longer lever which will increase the risk of fracture at the point of attachment. The purpose of the invention is to eliminate this disadvantage and make possible detachable mounting of various types of engaging means without the risk of fracture at any point of attachment.
This is achieved by a hand tool in which, as an engaging means, there is used an interchangeable tip or bit, the front portion of which is a regular screwdriver tip, a cross-head screwdriver tip, a hexagonal pin, a hexagon nut socket or other tool, the rear portion of which is hexagonal in cross-section and is removably insertable into a holder to a non-rotatable position therein. The invention is characterized in that the holder has a socket portion which in all positions is guided relative to a corresponding portion of the front end portion of the tube. The engaging means can be held in the holder by a magnet, with a snap coupling or by other known means. The holder has a cylindrical bearing surface which cooperates with a corresponding bearing surface on the front end of the tube and which has such a length that the lateral forces can be absorbed without any risk of fracture at any point of attachment.
In the accompanying drawings, the known tool is shown in FIGS. 1-4. FIGS. 5-10 show different embodiments of a tool with a holder according to the invention for interchangeable holding of an engaging means.
FIG. 1 is a longitudinal section through the known tool with the handle in its forward end position and the engaging means in its advanced end position free of the end of the tube.
FIG. 2 is the same longitudinal section as in FIG. 1, but with the handle in its rear end position and the engaging means in its retractire position in the holder fixed to the end of the tube.
FIG. 3 is a cross section along the line 3--3 in FIG. 1 through the engaging means in the form of a hex-head pin.
FIG. 4 is a cross section along the line 4--4 in FIG. 1 through the hexagonal socket for receiving the hex-head pin.
FIGS. 5-10 show different variants of a holder according to the invention for interchangeable engaging means with the end in the form of a screwdriver, a cross-head screwdriver or other tips, which are available on the market in sets of tips. The holder, in its various embodiments in FIGS. 5-8, is locked against rotation relative to the tool by means of cooperating cogs or teeth when the rotating shaft is in its retractire position, and is released for rotation relative to the tube when the rotational shaft is in its extended position in the tube, where the cooperating cogs or teeth are out of engagement.
The numeral 10 designates an angle tube with two main components 12 and 14, which form approximately a right angle with each other.
The longer straight tube portion 14 has mounted thereon a rotatable and longitudinal displaceable handle 16, which, in its forward end position according to FIG. 1 is in contact with the end of the tube 14.
To the handle 16 there is fixed a flexible rotational s
REFERENCES:
patent: 2704005 (1955-03-01), Clayson
patent: 2892477 (1959-06-01), Holt
Pelkonen Johan
Pelkonen Pekka
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