JPS60183225A - Concave cam - Google Patents

Abstract

PURPOSE:To prevent generation of a component force which impedes the swivelling moment of a cover produced by push-up by the use of an actuating lever, by a method wherein the cam surface of a convex cam formed in the interior angle of the cover with which the roller at the forward end of the actuating lever is brought into contact is formed into a specified curved surface dynamically formed. CONSTITUTION:A cover formed with a number of L-frames (c) is supported to a lateral beam (b) secured to a wall surface (a). A concave cam 1 is attached to the inner angle part of the frame (c), and a roller 2a at the forward end of an actuating lever 2 is brought into rolling contact with the covex cam 1. The actuating cam 2 is elevatable through the medium of a ball screw 4 through rotation of a motor M. The surface shape of the convex cam 1 is formed into a curved surface which is formed with the locus of a tangential line between the cam surface and the surface of the roller 2a at an acting point 3. This, when the actuating lever 2 is raised when the cover 1 is opened, causes a reaction force at an acting point between the convex cam 1 and the roller 2a to always coincide with the direction of the axis of the actuating lever 2 to achieve a desired purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concave cam of a bone frame in which a cover consisting of a large number of frame frames supported on cross beams or the like can be rotated via an operating ring that vertically moves up and down.

The inventor of the present invention previously proposed that the tip roller (cam flow) of the operating ring of this type of fan-shaped cover is movable on the peripheral cam surface provided along the inner corner of the old model. developed an opening/closing mechanism capable of converting the linear motion of the operating ring into a fanning motion of the cover. (Refer to Utility Model Registration No. 1437036) However, in this opening/closing structure, as shown in FIG. Therefore, when opening and closing the cover, it was inevitable that a component force would be generated in response to the acting force (=) of the actuating rod 4 that moves up and down in the vertical direction, resulting in a large loss in the driving force of the actuating ring. The problem was not only that, but also that the lid could not be opened or closed depending on the direction and magnitude of the component force generated.

In view of these circumstances, the inventor of the present invention has made the shape of the cam surface into a concave curved surface formed by the locus of the tangent at the point of action of the roller of the operating ring, as a result of extensive experiments and studies. This successfully prevents the generation of component force that would hinder the fanning moment of the cover due to the pushing up of the ring, and makes the opening and closing of the cover extremely labor-saving.゛Hereinafter, the configuration of the concave cam of the present invention will be described in more detail based on the embodiment shown in FIG. , 1 in the figure
is a bony frame located at at least one end of the tegmentum of the epitaxial series (
A concave cam installed along the inner corner of C1 or 2 is an operating ring whose tip roller (cam floor) 2a is in contact with the cam surface and can be moved, and the lower end is connected to the motor (M). The intermediate portion intervenes in the ball screw 4 and is vertically movable by the rotation of the motor (Ml).

Therefore, the surface shape of the concave cam l provided in one of the bridges (with bl as the fulcrum (bl) and its end (free end) fanning out) is such that the cam It is a concave curved surface obtained by the locus of the tangent to the surface of the roller 28 at the point of action 3 on the surface.

That is, the point of action 3 is the point where the extension of the axis 2b of the actuating ring 2 passing through the center of the roller 2a intersects the cam surface via the roller, so the point of action 3 with widening is the point where the extension of the axis 2b of the actuating ring 2 passing through the center of the roller 2a intersects with the cam surface. The tangent line forms a predetermined continuous concave curved surface.

In the figure, 5 indicates a speed reducer, 6 indicates a glue mint switch for stopping the operation frame, and 7 indicates a panel or hood cloth attached to the bone frame TCI of the cover.

However, the elevating means for the actuating ring 2 is not limited to a top-threaded ball screw, and the gist of the present invention will not be changed in any way even if it is replaced with a normal screw-fitting method, a fluid-driven piston method, or the like.

・In addition, the purpose is to prevent the cover from separating from the operating ring 2.
In addition to arranging the rollers on the left and right sides and inserting them into the side grooves of a concave cam made of, for example, H-shaped steel, it is also possible to provide any securing means between the two members.

In the concave cam of the present invention according to the configuration on paper, when the operating ring 2 is raised to open the cover, the reaction force at the point of action between the concave cam 1 and the roller 28 at the tip of the operating frame is always activated. Since it is configured to coincide with the axial direction of the ring 2, no unnecessary force is generated, and the cover with the cross beam as the fulcrum can be rotated smoothly from beginning to end with a small driving force. be.

On the other hand, in order to close the cover from this state, by rotating the motor (M) in the opposite direction and lowering the operating ring 2, the cover must be returned to its original position in the completely opposite operation to the opening operation. This is possible.

As described above, the concave cam of the present invention enables the lid to be opened and closed reliably and labor-savingly using a specific curved surface obtained dynamically, so it does not require unreasonable effort as seen in conventional peripheral cams. In addition to completely eliminating the wasted power and mechanical troubles caused by such operations, especially those that use a ball screw for the operating ring, the lifting and lowering operations can be performed more easily, and in combination with the action of the concave cam, the power is reduced. This can significantly reduce the

On the other hand, the scope of application of the present invention is not limited to the lower layer of the above-mentioned embodiments, but can be widely used, for example, as a fully openable cover for the loading platform of a freight vehicle. It has been recognized for its excellent features, such as being able to be used repeatedly with a car battery.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional opening/closing mechanism of a wing body using a cam surface, Fig. 2 is a side view showing an opening/closing mechanism using a concave cam of the present invention, and Fig. state,
Also, Figure B shows the cover in its fully open state. In the figure, 1...concave cam, 2...operating ring, 3...
Point of action, 4...Ball screw, 5...Reducer. Patent applicant: Capital: Former two agents: Patent attorney: Kazuo Ohara

Claims (1)

[Scope of Claims] 1. A cover consisting of a large number of bone frames is pivotally provided, and the series of covers can be rotated by an operating ring that is movable up and down in contact with the inner corner surface of at least one of the bone frames. A concave cam characterized in that the cam surface is formed by the locus of a tangent at a point of action where the axis of the operating ring intersects with the cam surface via a roller. 2. The concave cam according to claim 1, wherein the operating ring is movable up and down by a pole screw.