Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
  • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
  • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
  • B66C1/422—Gripping members engaging only the external or internal surfaces of the articles actuated by lifting force

Definitions

• the invention relates to a self clamping lifting clamp for lifting objects, such as work pieces in the metal machining industry. It also relates to a method of lifting an object using such a clamp.
• An advantage of such a device according to the present invention is that grasping and/or manipulating or a weighty object can be achieved in a more convenient manner that in devices according to the state of the art, at least lacking mutual positioning of the clamp members.
• the device is arranged in a way in which the clamp members are each pivotably connectable to a second end of said respective first and second scissor halves.
• Such a pivotability provides a way of connecting the scissor halves with the clamping members in line with applying the positioning means .
• first and second clamp members are connected with each other by means of an extendable bar construction, in such a way that the first and second clamp member are rotatable about substantially the same axis.
• each of the first and a second grasp member comprises one or more deformable contact members.
• the advantage of a deformable contact member having a deformable contact surface is the ability to make sufficient contact with non-flat surfaces.
• the contact members comprise rubber. Using rubber contact members will reduce the risk of damaging the object. Furthermore, a rubber contact surface results in good grip on the outer surface of the object to be lifted. In an embodiment each of the scissor arms
• - ⁇ is smaller than 90°, and preferably larger than 60°.
• the angle between the contact surfaces is less than 180°. If the angle ⁇ is less than 90° the clamp members are particularly suitable to grasp substantially tubular objects .
• the extendable bar construction comprises a telescopic extension arranged in parallel with the axis of the first and second clamp member .
• the invention also relates to a method of lifting an object, the method comprising;
• FIG. 2 shows a 3D view of the clamp of Figure 1 from a different perspective
• FIG. 3 shows an object that is clamped using an clamp according to an embodiment
• FIG. 4 shows some typical dimensions of the components of the clamp according to an embodiment.
• FIG. 1 shows a 3D view of a self clamping lifting clamp 1 according to a preferred embodiment of the invention.
• the clamp 1 comprises a first scissor arm 2 and a second scissor arm 3 that is pivotably connected to the first scissor arm 2 so as to form a scissor mechanism.
• a handle 4 is provided for raising the clamp 1 by means of for example a rope or a tackle.
• a first hoisting arm 5 and a second hoisting arm 6 are pivotably connected between the handle 4 and a first end of the scissor arms 2,3.
• two clamp members 7,8 respectively, are pivotably connectable to the scissor arms 2,3.
• a first and a second grasp member 9,10 are connected to a corresponding clamp member 7,8.
• the grasp members 9,10 can be moved towards each other so as to grasp an object inserted between the first and second grasp members by exertion of a tensile force on the handle 4.
• This way of clamping is common for the state of the art scissor clamp lifting devices, as will be known by the skilled person.
• the grasp member 9,10 are rotatably connected to their clamp members 7,8. Once an object is clamped it can be rotated in the clamp for easy positioning and handling. This is particularly convenient when the object is a heavy working piece that needs to be positioned in or on a milling machine. Exact positioning is most often crucial and a hazardous task. By being able to rotate the object, the user is able to exactly position the object before the clamp is loosened and the object is freed.
• the clamp 1 comprises an extendable bar construction comprising a telescopic arm 14 and two connecting sections 15,16 for connecting the telescopic arm 14 to the clamp members 7,8.
• An telescopic arm 14 is easily extendable and has a simple and solid construction. The telescopic arm 14 will
• the clamp members 7,8 are aligned. In this way the grasp members 9,10 will rotate about substantially the same axis.
• a further advantage of the extendable bar construction is that the object can be clamped more secure and the risk of the object falling out of the clamp is minimized.
• the contact members 17,18 are deformable comprising deformable material such as rubber.
• deformable contact members increases the number of object that can be securely clamped. Rubber contact pads are preferable since rubber is a also very anti-slip.
• the handle 4 comprises an opening 20 through which a rope or tackle can be pulled for lifting up the clamp 1.
• a hinge spindle 22 is provided to let the scissor arms 2,3 pivot.
• FIG. 2 shows a 3D view of the clamp 1 from a different perspective.
• a grip 23 is shown which can be used by a user to grip and manoeuvre the clamp 1.
• the grip 23 is mounted on the hinge spindle 22.
• a latch 24 is provided to lock the clamp 1 in a open position, as will be known by the skilled person.
• each of the grasp members 9,10 comprise a connection section, not shown in Figures 1 and 2, for rotatable insertion into the
• the grasp members 9,10 are replaceable so that different types of grasp members can be installed for lifting all kinds of objects.
• first and second grasp members 9,10 are aligned along an axis 30, see Figure 2.
• This axis 30 corresponds to the axis of rotation of the object to be clamped.
• the grasp members 9,10 may have a first arm 25 having a main axis that makes an angle ⁇ with the rotation axis 30 of the grasp member.
• the angle ⁇ is smaller than 90°.
• Figure 4 shows some typical dimensions of the components of the clamp according to an embodiment.
• the values shown are mm.
• a typical weight of the clamp is 10 kg.
• the axis ⁇ between the contact surfaces and the axis of rotation is larger than 60°, for example 75°. Other dimensions, angles and weights are used

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Load-Engaging Elements For Cranes (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (2)

Cited By (6)

Citations (4)

• 2010
  • 2010-07-13 WO PCT/NL2010/050454 patent/WO2011008091A1/en not_active Ceased
  • 2010-07-13 NL NL2005077A patent/NL2005077C2/en not_active IP Right Cessation

Patent Citations (4)

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