SU516519A1 - Adjustable torque wrench - Google Patents

Description

one

The invention relates to hand tools, namely wrenches, in which devices are placed for a limited amount of torque.

Known adjustable torque wrenches include a fixed lever with a working head, a torque adjustment mechanism and a power device consisting of a calibrated spring, an adjusting nut and a lock.

These keys can be applied to large tightening forces by moving the shoulder between the working head and the coupling by the telescopic device. belonging to the key.

However, the presence of a telescopic extension for obtaining the desired tightening forces complicates the design and increases the span of the key.

The purpose of the invention is to distribute the torque control range.

This is achieved due to the fact that the key is provided with a second jigsaw, irirnately connected to the first and having a longitudinal groove, at the ends of the hinges are semi-seams, forming a working head and pressed against each other by a lock

power device, which is fixed on the second ridge and is made in the form of a two-armed arm, one arm interacting with a calibrated spring, and the other with the first lever, the adjusting mechanism is made in the form of a carriage placed in the lever groove.

FIG. 1 - key, general view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 - section along

BB in FIG. one; in fig. 4 shows a section along BB in FIG. one; in fig. 5 is a view along arrow G in FIG. one; in fig. 6 is a section along d-d in FIG. one; in fig. 7 is a variant of placing the power device on the carriage which makes it possible to obtain a gear ratio

less than one.

The key consists of a lever 1, at one end of which a half-shed is made under the head of the boom-head (nuts), and at the other end the handle of the swiveling mold 2 with a half-end at the end, is fixed on

the plane of which is profiled with a longitudinal shponochnosh groove of the L-shaped section with a scale of gear ratios along the groove. The levers 1 and 2 of the sharnrio are connected by means of the axis 3. For latching the "1 levers 1 and 2" one relative to each other, a strap 4 is attached to one another.

In the L-shape, the slot 2 of the noqjeflcTBoM lever of the sliding keyed joint is installed in the carriage 5, fixed in the required position of the lever 2 by bolts 6 and 7.

The lumen groove of the L-section is complete to prevent the carriage bolts from turning when screwing in or unscrewing the nuts, for which a flat-faced flush head flush with the bolt stem is bolted on the heads of bolts 6 and 7.

On the carriage 5, a power device is installed, consisting of an adjusting nut 8, a calibrated spring 9, a fork 10, and a latch 11 (with equal or different shoulders).

One shoulder of the retainer 11 is pivotally connected to the fork 10, and the other shoulder under the influence of the spring 9 rests on the side edge jbwaf ha 1. Under the impact of the catch device, turn the lever 2 (with the end plane E of the working head rests on the corresponding end plane of the lever 1 and this provides the nominal size of the key.

In order to screw in fasteners having a different thread diameter, the key is provided with a set of removable end working heads having different sizes for a bolt head (nut). .

The key is as follows.

Depending on the set tightening torque, the adjusting nut 8 sets the calculated height h of the spring 9, i.e. her effort preload R.

The nuts of the bolts 6 and 7 are then loosened and the carriage 5 is set to (a certain gear ratio i on a scale plotted on the plane of gauge 2 and the carriage is fixed with the nuts of bolts 6 and 7.

The tightening torque MI is equal to:

-I M.Rch,

P - force to press the spring 9;

i - gear ratio;

L is the distance from the center of error 3 to the point of application of force P;

i is the distance from the center of axis 3 to the width of the bolt to be wrapped (nut),.

Various tightening torques can be set on the key as follows: by changing the force P using the adjusting nut 8 by setting the appropriate height h of the spring 9 without interchanging the carriage 5; shifting the carriage 5 to the corresponding gear chilo i of the scale without changing the calibrated spring, i.e. its height h; by simultaneously changing the force P of the spring 9 and swapping the carriage 5 to the corresponding gear ratio i.

When screwing the fastener in the throat of the working head of the key, a moment Mj appears, which cuts the shed. If the moment Mj is less than or equal to the moment Mj created by the spring 9, the opening of the throat does not occur.

If Mg Ml, then the working head is clenched, and the chain 2 is rotated at some angle relative to axis 3, which indicates the end of the wrap.

Claims (1)

Invention Formula A key with adjustable torque, containing a lever and a working head, a mechanism for adjusting the torque and a power device consisting of a calibrated spring, an adjusting nut and a retainer, and in order to expand the range of torque control, it is equipped with a second lever, hinged to the bottom of the first and having a longitudinal groove, on one end of the ridge half-tops are formed, forming a working head and pressed together by a lock of the power device, which is fixed to the second ry chaga and made in the form of a two shoulders ryiaga, one shoulder interacting with a calibrated spring, and the other with the first Riag; the mechanism for adjusting the torque of the key is implemented in the form of a carriage placed in the groove of the lever. L C4 : s 8 d I Cl C4 | /