Joints and connections – Articulated members – Lockable at fixed position
Patent
1994-12-13
1996-11-05
Johnson, Blair
Joints and connections
Articulated members
Lockable at fixed position
2481885, 248414, 403326, 403330, 403377, F16B 710
Patent
active
055709680
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a clamping device, in particular for securing an axially displaceable rod in optional adjustment positions, in which the object or rod to be clamped is clamped by a rolling body supported at a housing enclosing it. It will be understood that, alternatively, in kinematic reversal, the clamping device could be disengaged and then displaced and secured relative to the object or rod. Such clamping devices serve, for example, to secure a tripod, supporting leg or the like support or holder or add-on part for devices, in particular musical percussion instruments, in optional attitudes and positions.
2. Description of the Related Art
Clamping devices on percussion instruments are exposed to considerable impactlike loading whether used to secure the position of legs which are adjustable in length or to hold instrument parts in a vertically adjustable manner, e.g., the movable cymbals of a high hat. Moreover, the natural vibrations of the instrument persist for a long time after a blow delivered to the clamping device. The parts connected by the clamping device must therefore be capable of being securely fastened in position relative to one another in order to prevent any change in position during playing which would require readjustment. DE-30 00 536 A1 describes a clamping device for securing optional adjustment positions of a holding member on percussion instruments which is guided on a bar or the like so as to be displaceable coaxially thereto, in particular for holding cymbals, high hats, drums, etc. so as to be vertically adjustable. This holding member has a chamber with opposing inclined walls which encloses the bar and narrows in diameter in the direction of load. The rolling bodies which produce the clamping action and have at least cylindrical portions are arranged between the inner wall of the chamber and the bar. The central region of the rolling bodies is adapted to the profile shape of the bar which can have, e.g., a round, hexagonal or octagonal cross section. An adjusting screw which can be screwed into the housing and is provided with a knurled head acts on a plate arranged above the rollers and a lower plate arranged below the rollers is supported on a pressure spring.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a simpler design of the clamping device of the generic type.
This object is met, according to the invention, in that the rolling body is arranged in a lever head of a lever having, at its end remote of the lever head, a push button which is guided out through the housing and the rolling body contacts a portion of the housing wall constructed on its inner side as an oblique plane. The invention is based on the insight that the clamping action can be canceled simply by pressing down the end of the lever remote of the lever head and that a reliable clamping of the axially displaceable rod or clamping device which fully satisfies requirements can be achieved by the self-locking which is effected at the oblique plane after the lever end is released.
In a construction of the invention, the lever is formed by two parallel arms which are connected with one another by a crosspiece of the lever head at one end and by the push button arranged at the other end of the arms in a diagonal position relative to the crosspiece. The push button, which can advantageously receive within its inner chamber a pressure spring supported against the rod, projects out of the housing. When the user depresses the push button against the force of the pressure spring, the self-locking brought about at the oblique plane by the opposing force of the pressing force is canceled, whereupon the necessary adjusting movements can be carried out. When the desired adjustment position is achieved, the push button need only be released to restore the self-locking contact of the rolling body at the oblique plane as a result of the layout of forces.
The lever head is advisably supported so as to be swivelable on axles
REFERENCES:
patent: 1447519 (1923-03-01), Schade
patent: 2703691 (1955-03-01), Minnis
patent: 4367971 (1983-01-01), Coren
patent: 4502807 (1985-03-01), Salice
Kleindienst Anke
Sassmannshausen Werner
Chop Andrea
Johnson Blair
Kueffner Friedrich
Sonor Johs. Link GmbH
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