DE272839C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 272839 CLASS 87 «. GROUP

Hand tools.

Patented in the German Empire from February 20, 1912.

In the known pliers-like, effective by means of a propellant piston through a propellant Tools, the control member for the drive piston must be operated by itself, so that it is not possible to control the movements to bring the control member and the pliers legs in such a way that one with the you can cut the security you are used to with hand pliers by using the resistance on the jaws of the pliers feels and measures the amount of pressure on the forceps accordingly.

The purpose of the invention is to remedy this disadvantage to avoid and machine cutting with just as much safety as with hand pliers to enable the pliers to be handled just as tactfully as hand pliers, but little physical strength and dexterity are required. The invention consists in that by the compression of the pliers legs moves a control element into the open position, which allows the propellant to pass behind the propulsion piston, its movement through suitable transmission means for closing the pliers legs is made available. Around To control the drive piston, it only needs to be squeezed or released the pliers arm, so that the new pliers are just as easy to use as one Ordinary pliers and the pressure of the hand and propellant add up as well have to.

The rear part serving as a handle goes through with the associated front part A hinge pin is connected to a pliers leg when the two are pressed together Pliers legs are advantageously pressed directly against the control element, which also like the associated drive piston arranged on the front part of the multi-part pliers leg is.

According to the invention, the pincer spring is arranged so that it always controls the control element can step into the exhaust position and only opens when the. Spring when it hits the Pincer jaws is compressed on a resistance. The controller is doing it pushed into the exhaust position by the pressure of the propellant, which has the advantage of that when working with the pliers you can easily tell by the feel of the hand, whether there is pressure medium in the control chamber.

In order to be able to use the hand tool, if necessary, without the aid of the driving piston, a device for blocking the control organ is provided in its closed position.

The device for transmitting the force of the driving piston to the pliers legs is like this made so that it can be removed easily,

when the pliers z. B. should be cleaned, but still with springy pressure on the Holds the pliers legs.

In the drawing, an embodiment of the invention is shown as an example.

. The handle α of one pliers leg is articulated by a bolt h to the front part b , which like the second pliers leg c around the bolt t

ίο the actual pincer joint is rotatable. On the leg part b , the drive cylinder f is attached, in which the drive piston g is displaceable, which is coupled to the other pliers leg c by a U-shaped, resilient bracket. The control element d , to which the pressure medium is fed through the line k and the bores η and 0, is mounted under the drive cylinder f. The pressure medium entering the control chamber through the opening 0 always pushes the control element into the closed position shown in the drawing, in which the opening η is closed and the inlet opening / of the drive cylinder f is in communication with the exhaust openings p through the annular space, which is connected by the tapered point m of the control member d is formed between this and the control chamber. Against the free end of the control element d lies the nose-like end of the handle a rotatable about the bolt h , which is usually pushed away from the control element by the pincer spring i so that it can always assume its closed position.

If the pliers are detected, when the hook-like cutting part s of the pliers jaws rotates about a bolt r hits a resistance, the handle α must first go down against the action of the pliers spring i and the pressure medium acting on the control element from the opening 0 , and the control element Push d into the control chamber so that the exhaust ports p are closed and the inlet port η is connected to the inlet channel I of the drive cylinder f . The pressure medium can thus raise the piston g , whereby by means of the piston yoke e the pliers leg c is brought closer to the pliers legs a, b 0 and the pliers jaws must close. If the pliers legs a, b, c are released, the handle is turned back again by the pliers spring i , so that the control element returns to the closed position and the exhaust openings. p releases, whereupon the pincer spring can push the pincer legs completely apart by simultaneously pulling down the piston g and expelling the used pressure medium through the exhaust holes p .

Due to its resilient nature, the piston yoke e can easily be removed from the pliers legs with its two legs spreading apart when the pliers are to be cleaned.

In order to be able to cancel the articulated connection of the two halves a, b of one pliers leg, a hand screw q is provided at the joint end of the handle α , through which the leg α can be rigidly screwed to the leg b , so that when the pliers are used, rotation of the handle α around the bolt h is no longer possible and so the control element d remains permanently closed.

For the essence of the invention, it is irrelevant how the forceps mouth is designed, i. H. the The jaws of the pliers can also be designed like scissors, spoon-like, die-like, toothed, etc. be.'

Claims (8)

Patent Claims: 1. Pliers-like hand tool effective by a pressure medium by means of a drive piston, characterized in that by pressing the pliers hand legs (a, b, c) together, a control element is opened, which drives the propellant behind a working piston (g ) can occur, while releasing the resilient pliers legs these are opened and the control member is moved back into the closed position. 2. Pliers according to claim 1, characterized in that the handle (α) of the with the front part (b) by a hinge pin (h) connected a pliers leg (a, b) when pressing the two pliers legs (α, b, c) against the control element (d) mounted in the front part (b) of one of the pliers legs (α, b ) strikes and pushes it into the open position. 3. Pliers according to claim 1, characterized in that the pliers spring (i) is arranged so that it always allows the control member (d) to enter the closed and exhaust position and only allows the inlet position of the control member when the jaws of the pliers encounter resistance. 4. Pliers according to claim 1, characterized in that the free end of the pliers spring (i) arranged in a known manner between the pliers legs (α, b, c ) extends against the part (α) of the handle which is rotatable about the hinge pin (h) (α, b) and thus the control element (d) always moves into the closed and exhaust positions. 5 · Pliers according to claim ι, characterized in that the control member (d) is held in the closed position by the pressure of the propellant. 6. Pliers according to claim i, characterized in that the piston force of the drive piston (g), which is displaceable on one pliers leg, is transmitted to the other pliers leg through a bracket (e) which, on the one hand, over the piston fg), on the other hand, via the opposite pliers leg (c ) takes effect. 7. Pliers according to claim 1 and 6, characterized in that the bracket fe) has a U-shaped basic shape and can be resiliently spread apart so that it can be easily removed. 8. Pliers according to claim 1, characterized in that the handle fa) of the one pliers leg fa, b) can be rigidly connected to the upper part fb) of the leg by a hand screw (q) , so that the control member (d) is not in Open position can occur. 1 sheet of drawings.