RU212800U1 - Locking device - Google Patents

Abstract

The utility model relates to the field of instrumentation and can be used in threshold safety devices for blocking the axis of the instrument's actuating shaft when exposed to external acceleration. The blocking device contains an actuating shaft fixed in the housing element, an inertial mass, a spring holding the inertial mass. The inertial mass is made in one piece with the spring. The executive shaft is made with a groove in the direction opposite to the direction of external acceleration. The spring is made flat, crimped, with a protrusion at the end, with the possibility of its insertion into the groove of the actuating shaft. The resistance to the expansion of the spring compensates for all displacements of the inertial mass in the direction of the executive shaft at any value of external acceleration below the threshold of the locking device. The technical result is a reduction in the complexity of manufacturing a blocking device. 1 ill.

Description

The utility model relates to the field of instrument engineering, namely to threshold safety devices, and is intended for blocking the axis of the instrument's actuating shaft under a given external action.

Known precision blocker combined action containing a housing with a collet clamp and a mounting sleeve with an elastic element. The base is placed inside the body. The mounting sleeve is fixed on the base with its end surface and closes the body with a collet clamp. The base end is fixed in the body with a collet clamp and mounted on the shaft. The body with a collet clamp is fixed on the body of the device, relative to which the shaft is fixed. At least three bearing units are made in the body on the side opposite from the collet clamp. At least three paired channels are made in the base, each pair of which contains a piezoactuator and a geared electric drive. The gear drive shaft is connected to a self-braking screw-nut transmission, connected by means of a threaded connection to the elastic element of the mounting sleeve and connected to the bearing assembly. Patent of the Russian Federation for the invention No. 2674956, IPC F16D 49/18, F16D 49/20, 12/13/2018.

The device belongs to the shaft locking mechanisms in the field of mechanical engineering and requires complex assemblies, incl. electric drive.

In a number of tasks, it is required to ensure guaranteed blocking of the instrument's actuating shaft during emergency external influences, in which the device's response threshold is set constructively. The sensitive element of such a device should be an inertial element that perceives the load caused by an external influence, and the structural element that determines the response threshold can be an elastic element.

One of the blockers of the inertial principle of operation is the device for blocking the ratchet mechanism of the car seat belt (see "Seat belt. Device, principle of operation, types of seat belts" [Electronic resource] - Access: gogermetik.com/remen-bezopasnosti-ustrojstvo-vidy-prednaznachenie .html#i-25).

Inside the blocking device there is a sensitive element that is directly responsible for blocking, which is made in the form of a ball. In case of emergency impact, the ball, moving through the system of levers, clings to the body of the gear of the coils. If the belt is moving fast, the flywheel disc will press harder on the helical surface, thus blocking the ball.

Those. in case of emergency action, the ratchet mechanism is blocked due to the displacement of the ball and fixation of the coil. The device has a very complex design and limited scope.

A locking assembly of the access blocking mechanism is known, containing a bracket fixed on the movable part of the locking object, made in the form of a rod, in which a closed hole is made at its free end for inserting a rod located on the fixed part of the locking object associated with the drive of its reciprocating movement . Utility model patent of the Russian Federation No. 131680, IPC B60R 25/01, 27.08.2013.

The design of the device does not involve the use of inertial forces for blocking, and also does not contain structural elements that determine the response threshold, and is complicated due to the reciprocating movement mechanism, which increases the complexity of manufacturing the device and limits the scope.

A blocking device is known, containing an actuating shaft fixed in a housing element, an inertial mass and a spring holding the inertial mass, with an actuating shaft made with flats, in which the inertial mass is made in the form of a frame with a closed hole with a groove in the direction of external acceleration, with the possibility of inserting an executive shaft into it in the area of the flats and with a rigid spring, the compression resistance of which compensates for all displacements of the inertial mass in the direction of the executive shaft, at any value of external acceleration below the threshold of the locking device. Utility model patent of the Russian Federation No. 207688, IPC B60R 25/01, 11/11/2021. This technical solution is accepted as a prototype.

The configuration of the inertial mass of this device has the shape of a frame and involves the use of a complex part for this, as well as complex guide elements that determine the trajectory of its movements inside the body element. In addition, the connection of the inertial mass with the spring requires the introduction of additional fastening and fixing elements into the design, which leads to an increase in the complexity of manufacturing this device as a whole.

The objective of the utility model is to create a threshold axle locking device that uses inertial force and ensures low labor intensity of manufacturing by simplifying the design.

The technical result is a reduction in the complexity of manufacturing a locking device.

The technical result is achieved by the fact that the blocking device contains an actuating shaft fixed in the housing element, an inertial mass, a spring holding the inertial mass. The inertial mass is made in one piece with the spring. The executive shaft is made with a groove in the direction opposite to the direction of external acceleration. The spring is made flat, crimped, with a protrusion at the end with the possibility of its insertion into the groove of the actuating shaft, and the resistance to the expansion of the spring compensates for all displacements of the inertial mass in the direction of the actuating shaft at any value of external acceleration, below the actuation threshold of the blocking device.

The essence of the utility model is illustrated by the drawing, which schematically shows the blocking device in the initial (I) and actuated (II) state, where:

1 - executive shaft (axis);

2 - housing element of the device design;

3 - inertial mass;

4 - flat crimp spring.

The blocking device is a structure containing an actuating shaft 1 with a groove (shown in the drawing in cross section), fixed in the body element of the device 2, and an inertial mass 3, made in one piece with a flat crimp spring 4. The flat crimp spring 4 is made with a protrusion at the end with the possibility of its insertion into the groove of the executive shaft 1. The inertial mass 3 is held in the initial state of the device due to the rigidity of the flat crimp spring 4 from displacement in the direction of the executive shaft 1. In the initial state of the device, the protrusion at the end of the flat crimp spring 4 does not prevent, in if necessary, turn the executive shaft around its axis.

The properties of a flat crimp spring 4, its geometric and physical parameters, as well as the dimensions and properties of the inertial mass 3 are selected based on the design features of the device and the threshold of operation of the blocking device for the values of external influence specified in each particular case (acceleration M).

The blocking device works as follows.

When an external impact on the design of the device exceeds the threshold value determined by the rigidity of the flat crimp spring 4, the inertial mass 3 is displaced in the direction of the executive shaft 1, while overcoming the resistance to the expansion of the spring 4, and introduces the protrusion made at the end of the flat crimp spring 4 into the groove of the executive shaft 1, blocking it and thereby preventing the possible rotation of the executive shaft around its axis. The position of the protrusion in the actuated state of the blocking device is ensured during the entire time of external action (acceleration M) on the device. In this case, the spring 4 is in the unclenched state.

With a decrease in external influence (acceleration M), the spring 4, compressing (with force F pr), shifts the inertial mass 3 towards its initial position, compensating for its inertial force (F im), while removing the protrusion of the spring from the groove of the executive shaft 1.

The threshold value of the device (ie the blocking of the axis of the executive shaft 1) is selected in each case, depending on the field of application of the device. This value is determined by the stiffness of the flat compression spring 4 and therefore remains the same for each design of the locking device.

To simplify the manufacturing technology of a flat compression spring with an inertial mass, the latter can be made in the form of a cylindrical weight welded along the contour to its surface.

The constructive implementation of the blocking device does not require complex technological operations, which reduces the complexity of its manufacture.

Claims (1)

A blocking device comprising an actuating shaft fixed in the housing element, an inertial mass and a spring holding the inertial mass, characterized in that the inertial mass is made in one piece with the spring, the actuating shaft is made with a groove in the direction opposite to the direction of external acceleration, the spring is made flat, crimped, with a protrusion at the end with the possibility of its insertion into the groove of the actuating shaft, and the resistance to the expansion of the spring compensates for all displacements of the inertial mass in the direction of the actuating shaft at any value of external acceleration below the threshold of the locking device.

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