JPS6016731B2 - hand magnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hand magnet that attracts magnetic substances and is used for carrying.

Additionally, the applicant has already filed an application for a hand magnet that can release the magnetic force with a simple action and that can attract magnetic substances and be carried around in a stable state.

For example, as shown in Fig. 1, the connecting part 1 used as a handle and the guides 2 and 3 are formed into a portal-shaped frame made of a non-magnetic material, and the coercive force is small, but the magnetic permeability is large. The adsorption members 4 and 5 are made of a soft magnetic material and are continuously fixed to opposing surfaces of the guides 2 and 3, and the adsorption member villages 44 are provided in the spaces between the adsorption members 4 and 5, respectively.
A permanent magnet 6 having an N pole and an S pole appearing on the surface opposite to the magnet 5 is fixed to the actuating member 7 provided inside the connecting member 1 so as to be slidable along the guides 2 and 3. It is configured.

For example, it is assumed that the permanent magnet 6 is provided so that the N pole appears on the surface of the permanent magnet 06 facing the attraction member 4, and the S pole appears on the surface of the permanent magnet 6 facing the attraction member 5.

First, when attracting an object made of a magnetic material, the tips of the attraction members 4 and 5 are brought into contact with the object, and the permanent magnet 6 is attached to the attraction member 4 as shown in FIG. 1a. Slide it between 5 and 5. Therefore, a magnetic open circuit is formed from the N pole of the permanent magnet 6, the attraction member 4, the object to be attracted, the attraction section 5, and the S pole of the permanent magnet 6, holding the connecting section 1 and holding the object to be attracted. It can be moved while being adsorbed.

On the other hand, when detaching the object to be attracted, by gripping the permanent magnet 6 so that the actuating member 7 and the connecting member 1 approach each other, the permanent magnet 6 is attached to the attracting member 1, as shown in FIG. 1b.
, 5, the part facing the attraction members 4, 5 disappears, the magnetic force of the permanent magnet 6 no longer acts on the object to be attracted, and the object to be attracted hatches from the attraction members 4, 5. However, when using the conventional hand magnet as described above,
In the case of detaching an object to be attracted, if the object to be attracted is a small and lightweight object or an aggregate thereof, the permanent magnet 6 will not be able to attract the object even though it is located away from the attraction members 4 and 5. There are cases where the object to be attracted does not completely detach from the attraction members 4 and 5 due to the magnetic force caused by the residual magnetism of the members 4 and 5.

This occurs when the object to be adsorbed is lightweight, and the adsorption member 4,
This occurs when the magnetic force due to residual magnetism of No. 5 is large. This phenomenon also occurs when both the adsorption members 4 and 5 are made of a European magnetic material, which is a magnetic material with a small holding force but a high magnetic permeability.

This is because the magnetic force due to the residual magnetism of the adsorption members 4 and 5 cannot be completely reduced to zero.

The present invention has been made in view of the above, and an object of the present invention is to provide a hand magnet that eliminates the above-mentioned conventional drawbacks and can completely reduce the suction force of the suction member to zero when detaching an object. According to the present invention, this object is achieved by providing means for canceling the residual magnetism of the attracting member when the permanent magnet is located at a position away from the attracting member. The present invention will be explained below using examples.

Figures 2a and 2b are perspective and partially sectional views of a first embodiment of the invention.

In FIGS. 2a and 2b, the same components as in FIGS. 1a and b are given the same reference numerals.

That is, 1 is a connecting member, and 2, 21, 3, and 3' are guides connected by the connecting member 1, and are made of a non-magnetic material. Numerals 4 and 5 are adsorption members made of a soft magnetic material that has a small coercive force but a large magnetic permeability, 6 is a permanent magnet, and 7 is an actuating member fixed to the permanent magnet 6.

Note that 8 is a stopper for the permanent magnet 6. In this embodiment, a part of the suction section village 4 is extended to the suction member 5 side, and is arranged on the same plane as the suction member 5 with a predetermined spacing therebetween.

This extension is designated 4'. Similarly, a part of the suction member 5 is extended to the suction member 4 side, and is arranged on the same plane as the suction member 4 with a predetermined spacing therebetween.

This extension is designated 5'. So adsorption village 4,
The extension of 5 also constitutes part of the guides 2 and 3', 3 and 2'.

Now, when an object to be attracted is to be attracted and transported, the permanent magnet 6 is moved into the space between the attraction parts 4 and 5 by pushing down the actuating member 7 in the same way as in the conventional case shown in FIG. 1a. Also, when the object to be attracted is to be separated from the attraction members 4 and 5, the actuating member 7 is pulled up and the permanent magnet 6 is removed, as in the conventional case shown in FIG. 1b. This is done by pulling it out from the space between it and the suction member 4.

However, when the permanent magnet 6 is located at a position separated from the attraction members 4 and 5, the permanent magnet 6 is moved away from the attraction members 4 and 5.
It faces the extension parts 4', 5' of.

Now, for example, as in the case of the explanation of FIG.
Assuming that the north pole face of the permanent magnet 6 faces the attraction member 4 side and the south pole face of the permanent magnet 6 faces the attraction member 5 side, when the permanent magnet 6 is pulled up, the north pole face of the permanent magnet 6 is Similarly, the south pole face of the extension 5' faces the extension 4'. Therefore, in this state, the direction of the magnetizing force of the permanent magnet 6 with respect to the attraction members 4, 5 is the direction that cancels the residual magnetism of the attraction members 4, 5, and the extension portion 4' of the attraction members 4, 5
, 5', the residual magnetism of the attracting members 4, 5 can be made zero by appropriately selecting the area of the surfaces facing the permanent magnets 6. Reliably separates from the adsorption members 4 and 5.

As explained above, according to the present invention, by providing a means for canceling the residual magnetism of the attraction member in the hand magnet, when an object to be attracted is separated from the attraction member, the magnetic force due to the residual magnetism of the attraction member is weakened. , or zero, so even if the object to be attracted is a collection of lightweight objects, it will completely separate from the attraction section due to its own weight, eliminating the drawbacks of conventional hand magnets.

[Brief explanation of the drawing]

Figures 1a and 1b are perspective views of a conventional hand magnet;
Figures 2a and 2b are perspective and partially sectional views of a first embodiment of the invention. 1; connecting portions, 2, 3, 2' and 3'; guides, 4 and 5; attraction members; 6; permanent magnets; 4' and 5': extensions of attraction members 4 and 5; 7; actuation member. /Budino koji/Buta and sardines

Claims (1)

[Claims] 1. A non-magnetic frame formed into a gate shape by connecting the upper ends of a pair of guides with a connecting member used as a handle;
First and second adsorption members made of soft magnetic material, which is a magnetic material having a small coercive force but high magnetic permeability, are fixed oppositely to each other at a fixed interval at the lower end of the frame, and a permanent magnet that slides freely in and out of the space between the first and second attraction members and has an N pole and an S pole facing the first and second attraction members, respectively; and a permanent magnet that is fixed to the permanent magnet. In the hand magnet, the extended portion of the first attracting member is attached to the permanent magnet separated from between the two attracting members directly above the second attracting member. The hand magnet is located at opposite positions, and the extended portion of the second suction member is located at a position opposite to the extended portion of the first suction member directly above the first suction member.