CN2420103Y - Adjustable head for electric hand tools that can be locked at will - Google Patents

Abstract

An electric hand tool adjusting head capable of being locked at will. The utility model provides a be convenient for switch, reduce the motor-driven hand tool part that the switching leads to parts to damage, propose the utility model discloses it includes gear train, internal gear, torsion lid, seat, locking switching ring, extension spring, several posts, spring, several brake levers and anti-reversing structure, internal gear internal periphery, top and periphery are equipped with interior flank of tooth, dogtooth and outer tooth's socket respectively, torsion lid internal periphery and bottom are equipped with internal thread and shifting knob, the seat all is equipped with the step hole of several numbers, annular locking switching ring internal and external ring face is equipped with a plurality of oblique push hole and lug, the knot is equipped with the extension spring between locking switching ring and the seat.

Description

Adjustable head for electric hand tools that can be locked at will

The utility model belongs to a motorized hand tool part, in particular to an electric hand tool adjusting head which can be locked at will.

The torque adjustment head of electric hand tools is usually equipped with a locking mechanism, which ensures that the torque can be fully output. As shown in Figure 1, the conventional electric hand tool torque adjustment head uses the rotation of the torque adjustment cover 2 to compress the spring and steel balls placed in it, so as to change the pressure of the spring and make the steel ball on a certain pressure surface. Due to the relative relationship between the resistance force and the spring pressure, the structure continues to be driven by push-up or tripped to stop the transmission. In this way, the problem of damage caused by excessive torque can be solved. When the torque adjustment cover 2 is set from loose to tight, it can be seen from the outside, such as the generally set torque with a step distance of 1 to 10 from loose to tight, and the torque adjustment cover 2 is engraved on the bottom edge 21 There are scales from 1 to 10 marked or marked, and after the 10th level, there is generally a locking level A, which acts as a retreat space without the spring, so that the power can be fully output. At this locking point, the spring is generally pressed to the limit when the torque adjustment cover 2 is rotated and driven. Regardless, its location is after level 10. However, according to the general usage situation, the 1st, 2nd and locking levels are the most commonly used. But if the adjustment cover 2 of the conventional adjustment head is to use the locking level A, it must be switched to the locking level A from the 1st, 2, 3, 4... until the last level. In this way, it is not only extremely laborious and inconvenient to operate, but also the machine parts are easily damaged if things go on like this.

The purpose of the utility model is to provide an electric hand tool adjusting head which can be locked at will, which is convenient for switching and reduces the damage of parts caused by switching.

The utility model includes a gear set that outputs the power of the motor as a planetary gear, an internal gear meshed with the gear set, a torque cover, an intermediate seat, a locking switching ring, a tension spring, a number top column, a spring, a number brake lever and a reverse rotation prevention. Structure; the internal gear is provided with an internal tooth surface meshing with the gear set, and its top and outer circumference are provided with protruding teeth and external tooth grooves that conflict with the top columns; the torque cover is provided with an internal thread for adjusting the spring pressing force, and its bottom end is protruding There is a dial button; each seat is equipped with several stepped holes for accommodating the brake lever; the lock switching ring is ring-shaped, and its inner ring surface is provided with several oblique push holes, and its outer ring surface is convexly set to be pulled out from the bottom of the torque cover. The protrusion corresponding to the button; the locking switch ring is provided with a tension spring with an arc length of about 270°; the other end of the tension spring is buckled on the middle seat.

in:

The brake rod is in the shape of a short rod, the upper end and the lower end of which are semi-spherical, and a protruding ring is formed between the upper and lower ends, and a spring is sheathed under the protruding ring.

Because the utility model includes a gear set, an internal gear, a torque cover, an intermediate seat, a locking switching ring, an extension spring, a number top column, a spring, a number brake lever, and a reverse-reversing structure; On the surface, the top and outer circumference are provided with protruding teeth and external tooth grooves that conflict with the top columns; the torque cover is provided with internal threads for adjusting the spring pressing force, and the bottom end is protrudingly provided with a knob; the inter-seats are provided with a number to accommodate the brake. The step-shaped hole of the rod; the lock switch ring is ring-shaped, and its inner ring surface is provided with several oblique push holes, and its outer ring surface is protruded with a protrusion corresponding to the button at the bottom of the torque cover; the lock switch ring is provided with a buckle. There is an extension spring with an arc length of about 270°; the other end of the extension spring is buckled on the seat. When adjusting the output torque, when the lock switching ring is kept at the normal position, its upper inclined push hole is aligned with the upper end of the brake lever, and the brake lever is stretched into the lock switch ring with its upper end under the elastic force of the spring sleeved on it. In the oblique push hole, while the lower end is still kept in the stepped hole of the intermediate seat, the internal gear is not locked and is in an adjustable state. When you want to lock the utility model to ensure that the torque can be fully output, turn the torque cover in the opposite direction to drive the lock switch ring to rotate, and push the upper end of the brake lever down on the oblique push hole, and compress the spring so that the lower end of the brake lever is embedded Inserted into the outer tooth groove of the internal gear, the internal gear is in a locked state, and the internal gear can be locked at any point, which is not only convenient for switching, but also reduces damage to the parts caused by switching, thereby achieving the purpose of the utility model.

Fig. 1 is a schematic front view of the structure of a conventional electric hand tool adjusting head.

Fig. 2 is a schematic sectional view of the structure of the utility model.

Fig. 3 is a perspective view showing the exploded structure of the utility model.

Fig. 4 is a schematic cross-sectional view of the action of the utility model (normal adjustment state).

Fig. 5 is a schematic cross-sectional view of the action of the utility model (locked state).

Fig. 6 is a schematic partial cross-sectional view of the action of the utility model (normal adjustment state).

Fig. 7 is a schematic partial sectional view of the action of the utility model (locked state).

Below in conjunction with accompanying drawing, the utility model is set forth in further detail.

As shown in Fig. 2 and Fig. 3, the utility model includes a gear set 5 that outputs the power of the motor main shaft 1 as a planetary gear, an internal gear 8 meshing with the gear set 5, a torque cover 2, an intermediate seat 7, and a locking switching ring 6 , extension spring 60, number top post 70, spring 4, number brake lever 9 and anti-reverse structure.

The internal gear 8 is a cylindrical body, and the inner wall of the cylinder is provided with an internal tooth surface 81 meshing with the gear set 5. The top of the internal gear 8 is provided with protruding teeth 82 that conflict with a number of top posts 70, and the outer circumference of the top is provided with external tooth grooves. 83.

The torque cover 2 is provided with an internal thread 20 for driving the screw ring 3 , and a toggle button 22 is protruded from the bottom end thereof.

Each seat 7 is provided with several stepped holes 71 .

The locking switching ring 6 is annular, and its inner ring surface is provided with several oblique push holes 61 , and its outer ring surface is protruded with a protrusion 62 corresponding to the dial button 22 at the bottom end of the torque cover 2 .

The extension spring 60 has an arc length of approximately 270°.

The brake lever 9 is in the shape of a short rod, and its upper end 91 and lower end 93 are in the shape of a semisphere, and a protruding ring 92 is formed between the upper and lower ends 91, 93, and a spring 90 is sheathed below the protruding ring 92 .

The anti-reverse structure includes a rotating cover 84, a rotating joint 85, a fixed seat 86, a gasket 87, a roller 88, a bearing 89, a fastener 80, and the like.

The top column 70 is pressed by the lock switch ring 6, and the screw ring 3 is driven by the internal thread 22 of the torque cover 2, and the screw ring 3 is driven to move up and down, so that the spring 4 acts on the lock switch ring 6 through the spring washer 40 The pressing force of the spring 4 is applied to the top post 70 through the locking switch ring 6 . When the axial torsion force borne by the main shaft is greater than the pressing force of the spring 4, the protruding teeth 82 at the top of the internal gear 8 and the bottom of the top post 70 will produce a safety tripping effect.

The brake lever 9 is slidably installed in the stepped hole 71 of the intermediate seat 7, and its upper and lower ends 91, 93 can be fitted with the oblique push hole 61 on the lock switching ring 6 and the outer tooth groove 83 of the internal gear 8 respectively.

One end of an extension spring 60 with an arc length of about 270° buckles the locking switching ring 6 , and the other end is buckled on the intermediate seat 7 .

As shown in FIG. 4 , the tension spring 60 is in a relaxed state. As shown in FIG. 5 , when the torque cap 2 is rotated, the locking switch ring 6 is buckled and positioned by the button 22 whose bottom end corresponds to the projection 62 on the lock switch ring 6 .

As shown in FIG. 6 and FIG. 7 , the locking switch ring 6 rotates and shifts, and pushes down the brake lever 9 through its upwardly inclined push hole 61 , so that it buckles the outer tooth groove 83 on the outer periphery of the inner gear 8 .

As shown in Fig. 4 and Fig. 6, when the locking switching ring 6 is maintained at the normal position, its upper oblique push hole 61 is aligned with the upper end 91 of the brake lever 9, and the brake lever 9 acts under the elastic force of the spring 90 sleeved on it. Down, with its upper end stretches into the oblique push hole 61 of the locking switching ring 6, while the lower end 93 remains in the stepped hole 71 of the seat 7, the internal gear 8 is not locked and is in an adjustable state.

As shown in Fig. 5 and Fig. 7, when the locking switching ring 6 is rotated, the upper end 91 of the brake lever 9 is pressed down by the upper oblique hole 61, and the spring 90 is compressed, so that the lower end 93 of the brake lever 9 is inserted into the internal gear. In the outer tooth groove 83 of 8, the internal gear 8 is in a locked state, and its power is fully output without being affected by the reverse torque.

The utility model mainly provides a method of rotating the torque cover 2 in the opposite direction to move the lock switch ring 6, so that the several oblique push holes 61 set on the lock switch ring 6 press the brake lever 9 to go down to insert the internal gear. 8, the internal gear 8 cannot rotate, that is, it is in the state of no torque adjustable space, so that the power of the main shaft can be fully output, and the setting position of the locking point will not be restricted.

To sum up, the utility model is not only a rotatable and multi-point locking torque adjustment head, so as to adjust the output torque through the rotation of the torque adjustment head, but also can lock the internal gear only by partial reverse rotation, so as to The locking torque adjustment space realizes the full output of the torque, so it can be set beside the commonly used torque step, so that the locking step is close to the commonly used torque step, which is easy to switch and use, and thus can reduce the problem of machine damage caused by switching.

Claims (2)

1. An electric hand tool adjustment head that can be locked at will, which includes a gear set that outputs the power of the motor as a planetary gear, an internal gear that meshes with the gear set, a torque cover, an intermediate seat, a locking switching ring, a tension spring, a digital The top column, spring, number brake lever and anti-reverse structure; the internal gear is provided with an inner tooth surface meshing with the gear set, and its top and outer circumference are provided with protruding teeth and outer tooth grooves that conflict with the number top column; the torque cover is provided with Adjust the internal thread of the spring pressing force, and the bottom end of which is protrudingly provided with a toggle button; each seat is provided with a number of stepped holes for accommodating the brake lever; There are a number of oblique push holes, and the outer ring surface is protruded with a protrusion corresponding to the pull button at the bottom of the torque cover; the lock switch ring is provided with a tension spring with an arc length of about 270°; the other end of the tension spring is buckled between seat. 2. The adjustable head of an electric hand tool that can be locked at will according to claim 1, characterized in that the brake lever is in the shape of a short rod, the upper and lower ends of which are semi-spherical, and between the upper and lower ends A protruding ring is formed, and a spring is sheathed under the protruding ring.

Images