The object of the invention is a jaw grabber for fixing and arranging workpieces (both vertically and horizontally).

The prior art knows object-fixing grabbers equipped with prismatic jaws moved via an adjustment screw. The brackets of these jaws are mounted in a sliding manner.

A jaw grabber controlled via a drive motor is also known.

Patent description PL168349 discloses a jaw grabber characterised in that the pins, on which the ends of the lifting rods and arms are fixed, are connected with spigots mounted on both sides of the screw, the spigots are connected with sleeves, whose both sides have indentations, starting from a certain length of the sleeve, and whose ends are connected with a spacer ring at the screw, whereas a nut is fixed between the slats of the sleeve, and between the spigots and the nut in the sleeve a spring is installed, whereas the lifting arms mounted on the pins of the spigots are connected, in the middle of their length, by a pin, and at least one lifting arm is finished with a swivel handle.

Patent Application EP2465626A1 discloses the jaw has characterised in that flange body directly or indirectly arranged on a jaw chuck of machine tools e.g. lathes. A clamping part is arranged on the flange body, and contact lines of clamping bodies are reversibly moved relative to each other after abutment against a clamping surface of workpieces during a feed motion of the clamping bodies in a direction of the clamping surfaces. An abutment part (is provided in a region between the clamping bodies, and includes a bearing surface in a direction of the clamping surfaces, where the bearing surface defines one of the lines. Clamping jaw for a jaw chuck for clamping workpieces with partly spherical clamping surfaces on manually operated, semi-automated or fully automated machine tools (claimed) e.g. lathes. The jaw clamps the workpieces with the partly spherical clamping surfaces on the machine tools in safe, rapid, accurate and cost-effective manner. The jaw is efficient to use and inexpensive, and saves time.

Patent application US2011215537A1 discloses a tool-holder mandrel for fitting to a rotating machine, comprising: a body comprising a rear portion designed to be attached to a drive shaft of the rotating machine and a front portion in which housing are arranged converging toward the front; jaws mounted so as to slide each in a housing of the body and having an inner thread; a ring for moving the jaws, mounted so as to pivot relative to the body, having a peripheral thread interacting with the inner thread of the jaws so that the rotation of the ring closes or opens the jaws

Patent applciation WO2010106481A1 discloses device for gripping and handling elongated cylindrical bodies, such as pipes or sections of piping comprising a supporting structure with gripping means mounted on said supporting structure designed to hold the pipe in at least two gripping points along the longitudinal axis of said pipe, said gripping means comprising at least one fixed portion and at least one movable gripping element hinged to said fixed portion and subject to the action of means for bringing it from a closed position wherein the device holds the pipe into an open position wherein the device releases the pipe, means being provided on at least said fixed portion (5) or said movable gripping element that enable the rotation of said pipe while said movable gripping element is in the closed position.,

Patent application WO2011008091A1 discloses self clamping lifting clamp comprising: - a first scissor halve and a second scissor halve pivotably connectable to the first scissor halve for forming a scissor mechanism; - a grasping member for providing a grasp to the clamp; - a first hoisting member and a second hoisting member each movably connected with said handle and a first end of one of said scissor arms; - a first clamp member (and a second clamp member; en - positioning means for, during a mutual scissor movement of the scissor halves, providing of a mutual positioning respective to each other of the clamp members.

Patent application WO2012095540A1 discloses clamp for handling large loads. The load to be held is a prismatic block, which may be spherical or irregular and is held by the clamp at three points. The clamp has a master arm which is connected by means of at least one shaft to two free arms, with support elements which improve grip being present at both the holding end of the master arm and at the holding ends of the free arms.

Patent application WO2014018827A1 discloses a two-piece grab arm housing for a grapple mechanism useable on a grapple attachment is described. The grab arm housing includes a lower arm housing with grab arms mounted to the lower arm housing, and an upper arm housing mounted to the lower arm housing. The upper arm housing and the lower arm housing are movable relative to one another in an x-direction and are moveable together in a y-direction perpendicular to the x-direction. In addition, the upper arm housing includes an opening through which a main beam of the grapple attachment can extend.

Patent application WO2014116844A2 discloses a tool for lifting a tile from the bore of a chimney or other vertical opening has pivotably connected arms. Jaws at the lower ends of the arms are offset from a lifting point of the tool and optionally, from the pivot point. An actuating mechanism closes the jaws. One mechanism comprises a screw that moves a nut and one or more toggle elements connected thereto. Another mechanism comprises toggle elements which connect to the upper ends of arms and pull on them when upward force is applied at a lifting point. A releasable latch keeps the arms of tool spaced apart while a tile wall is being engaged. At least one jaw is a thin plate; preferably the opposing jaw is pivotable. Both jaws may be angled relative to the principal axis of the tool.

Patent application WO2014168610A1 discloses a slewing ring grease assembly for providing grease to internal gear teeth of a slewing ring. The slewing ring grease assembly includes a bulkhead fitting having a flange and a shaft, the shaft extends through a hole in the bulkhead attached to the slewing ring such that the shaft extends over the internal gear teeth of the slewing ring. The bulkhead fitting flange is secured to the bulkhead on a side opposite the internal gear teeth of the slewing ring. A passage through the bulkhead fitting is provided which is capable of delivering grease through the bulkhead fitting and onto the internal gear teeth of the slewing ring. The grease assembly may include a wall fitting extending through a wall of housing supporting the bulkhead and a connecting tube capable of delivering grease from the wall fitting to the passage of the bulkhead fitting.

A disadvantage of the known devices is the fact that they either require an external electrical supply or the use of physical force. The presented device, thanks to a ratchet mechanism, greatly simplifies the use of a grabber. Physical force is required to close the arms only in the early stage of clamping. The ratchet allows the user to have a constant grip on the grabbed object, and can be release with one button.

The described invention is distinguished by ease of use, as well as the speed and precision of fixing/grabbing of construction elements.

The jaw grabber according to the invention is characterised in that the body includes a shaft with trapezoidal thread, whereas the shaft is led through a trapezoidal nut and engages with it. A handle is mounted at one end of the shaft, and a connector with adapters at the other. The arms of the grabber are indirectly fixed with steel studs to the body and to the adapters. The left and right foot attached to both arms of the grabber constitute its grabbing element.

In the second aspect of the invention, the jaw grabber according to the invention is characterised in that the body includes a shaft with a gear, whereas the shaft is led through a trapezoidal nut and engages with it. A handle is mounted at one end of the shaft, and a connector with adapters at the other. The arms of the grabber are indirectly fixed with steel studs to the body and to the adapters. The left and right foot attached to both arms of the grabber constitute its grabbing element.

The above solutions, thanks to their simple design and ease of use, increase the reliability, the mechanical efficiency of the system and the conditions of its use.

The subject of the invention is shown as an embodiment, in which Fig. 1 shows a design of the grabber in the first aspect of the invention (main view) in the closed position, Fig. 2 - shows a design of the grabber in the first aspect of the invention (main view) in the open position, Fig. 3 - cross-section of the grabber in the first aspect of the invention, Fig. 4 - the grabber in the first aspect of the invention, side view, Fig. 5 - the grabber in the first aspect of the invention, isometric view from the top, closed position, Fig. 6- the grabber in the first aspect of the invention, isometric view from the top, open position, Fig. 7 - design of the grabber in the second aspect of the invention (main view form the left), closed position, Fig. 8 - shows a design of the grabber in the second aspect of the invention (main view from the left) in the open position, Fig. 9 - cross-section of the grabber in the second aspect of the invention, Fig. 10 - the grabber in the second aspect of the invention, side view, Fig. 11 - shows a design of the grabber in the second aspect of the invention (main view from the right) in the closed position, Fig. 12 and Fig. 13 - the grabber in the second aspect of the invention, isometric view from the top, open position, Fig. 14 and Fig. 15 - the grabber in the second aspect of the invention, isometric view from the top, closed position. Embodiment 1

The base of grabber consists of a body (3), which holds the trapezoidal nut (9), through which a shaft with trapezoidal thread (2) is led. One end of the shaft (2) includes a permanently fixed first handle (1), and the other includes a connector (5), which is fixed via a ball joint (10) and to which adapters (6) are fixed with steel studs and in an articulated manner. Both arms (7) (right and left) of the grabber are connected in an articulated manner with the body and the adapters. At the ends of the grabber arms (7) rubber feet (8) are attached in an articulated manner. The second handle (4) is also directly connected to the body.

It is driven by the rotation of the shaft with the trapezoidal thread (2) via the trapezoidal nut. Rotating the shaft (2) advances it, which makes the grabber arms (7) spread apart. The mutually parallel movement of the jaws is achieved thanks to the symmetrical arrangement of the moving parts (connector (5), adapters (6), grabber arms (7)). The move of the shaft with the trapezoidal thread (2) in the right direction clamps the handle. The move in the left direction releases the handle.

Embodiment 2

The base of grabber consists of a body (3'), which holds the trapezoidal nut (9') with the pin (11), through which a shaft with a gear (2 ¹ ) is led. One end of the shaft (2') includes a permanently fixed first handle ( ), and the other includes a connector (5'), and to which adapters (6 ¹ ) are fixed with steel studs and in an articulated manner. Both arms (7') (right and left) of the grabber are connected in an articulated manner with the body and the adapters. At the ends of the grabber arms rubber feet (8') are attached in an articulated manner. The handle (4') is also directly connected to the body.

It is driven by the rectilinear movement of the shaft with the gear (2') via the trapezoidal nut. Rotating the shaft (2') advances it, which makes the grabber arms (7') spread apart. The mutually parallel movement of the jaws is achieved thanks to the symmetrical arrangement of the moving parts (connector (5'), adapters (6'), grabber arms (7')). The movement of the shaft with the gear (2'), after grabbing an object, is locked by steel pin (11) fixed via plates (12) onto the body (3'). Unlocking the pin (11) releases the handle.

The grabber is suitable to grab various elements of different sizes. The ratchet mechanism allows the user to set the grip depending on the object and to adjust the clamping force.

The gripper can be easily disassembled and cleaned. All the components of the device are fixed via screws and nuts. When the handle is taken off, the internal shaft with a gear can be removed from the bottom of the device. The components can be cleaned by rinsing them with water.