Brakes – Rod
Patent
1996-09-12
1998-10-20
Butler, Douglas C.
Brakes
Rod
92 15, 92 25, 16DIG17, 248410, 188265, B65H 5910, F15B 1526, F16D 6300
Patent
active
058233008
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to brake devices of linear moving body where a piston rod of air cylinder is stopped by applying brake by frictional force, and more particularly to a brake device for a linear moving body where force in the direction of linear motion is utilized in brake force thereby the device can be manufactured in small size and at low cost and can be utilized for the falling prevention of the linear moving body and the emergency stop.
BACKGROUND ART
In the prior art, as a brake device for a linear moving body, U.S. Pat. No. 4,791,855 discloses a device for stopping a piston rod of an air cylinder by applying brake by frictioal force.
The invention in the prior art adopts mechanism that a brake member is rotated in orthogonal direction to the linear motion thereby the brake force is increased, and force in the direction of the linear motion can not be utilized for the brake force. Therefore the strong spring force and the complicated force increasing mechanism are required, and the manufacturing cost becomes high and the device becomes large size.
Further U.S. Pat. No. 4.981,069 also discloses a device for stopping a piston rod of an air cylinder by applying brake by frictional force.
The invention in the prior art adopts mechanism that a brake member is elastically deformed in orthogonal direction to the linear motion and the reaction force is made brake force. Also in this invention, force in the direction of the of the linear motion can not be utilized for the brake force. Therefore the strong elastic deforming force is required and further the strong brake releasing force is required. Also since the elastic deforming force is utilized, problem of variation of the brake force and dispersion of the brake force are produced, and quite high machining precision is required. This causes state that the device becomes large size and the manufacturing cost becomes high.
Also as the prior art closest to the present invention, an air cylinder is manufactured where a brake member of ring shape is fitted to a piston rod of an air cylinder in clearance fit, and the brake member is moved slantwise in the axial direction of the rod by the spring force, and further the slantwise motion is increased by the thrust of the air cylinder and the piston rod is locked.
This brake device is similar to the present invention in the point that the force in the direction of the linear motion is utilized for the brake force. However, this brake device is significantly different from the present invention in shape of a fitting surface between a piston rod and a through hole of a brake member. That is, in this brake device, when rotational moment is supplied to a brake member by a spring and thrust of an air cylinder and the brake member is moved slantwise and brake is applied, most of the reaction force of the rotational moment is the reaction force produced in parallel to the rotational moment, and most of the brake force applied to the piston rod becomes a value of the reaction force in parallel to the rotational moment multiplied by the friction coefficient.
Therefore since usual friction coefficient is about 0.2, in order to produce effective brake force in this brake device, a problem exists in that much reaction force is required. Also in such a brake device, in order to produce large reaction force, a method of increasing the spring force and increasing distance between fulcrums of the rotational moment produced by the thrust of the air cylinder, a method of decreasing dimension in the direction of the linear motion of the brake member or the like may be considered. However, the former causes large size of the brake device and is not suitable for the practical use, and the latter has a problem that the contact surface pressure of the piston rod is increased and the outer circumference of the piston rod is liable to be flawed and the brake member is liable to be broken.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a brake device for applying brake to a lin
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Butler Douglas C.
Pubot Giken Co., Ltd.
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