CN209831480U - Screwdriver with adjustable force arm - Google Patents

Abstract

The utility model relates to the field of electrician and electronic tools, and discloses a screwdriver with an adjustable force arm, which comprises a handle, wherein the handle consists of a first handle and a second handle, and the first handle is provided with a through hole and an inner hole; the second handle is provided with a screwdriver head and a bottom block; the bottom block is fixed with the tail part of the screwdriver head; the bottom block is provided with a raised square tenon; the first handle is connected with the second handle through the square tenon. The utility model provides a screwdriver is detachable screwdriver, both can use as traditional screwdriver, can dismantle the handle formula screwdriver of constituteing T type handle again, and the power of operator's palm directly promotes the handle, does not receive coefficient of friction's influence, raises the efficiency.

Description

Screwdriver with adjustable force arm

Technical Field

The utility model relates to an electrician's electronic tool field provides arm of force adjustable screwdriver very much.

Background

A screwdriver is a tool for driving a screw to be forced into place, and generally has a thin wedge-shaped head which can be inserted into a slot or a notch of a screw head-known as "screwdriver" in kynjin and shanxi north of shanxi, and also known as "screwdriver" in shanxi, anhui, and hubei, henna, shanxi guan, etc., and known as "screwdriver" in midwest region and west region, and "chiseling" in long triangle.

During tightening of the screw with the screwdriver, the operator applies a driving torque to the screwdriver, which in turn produces a resisting torque to the screwdriver. Only when the driving moment is larger than the resisting moment, the screw can be rotated and finally screwed to play a role in fastening.

The common screwdriver is a screwdriver with the heads and the handles being manufactured together, is easy to prepare and can be used only by being taken out. However, as can be seen from the foregoing, the torque applied to the screwdriver shank must be greater than the resisting torque to complete the fastening operation, and therefore, when fastening is performed using the self-tapping screw, the driving torque required is also much greater than that of a conventional screw. At this time, the conventional screwdriver tends to be untightful.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a improve, increase driving torque's arm of force adjustable screwdriver to traditional screwdriver.

The screwdriver with the adjustable force arm comprises a handle, wherein the handle consists of a first handle and a second handle, and the first handle is provided with a through hole and an inner hole; the second handle is provided with a screwdriver head and a bottom block; the bottom block is fixed with the tail part of the screwdriver head; the bottom block is provided with a raised square tenon; the first handle is connected with the second handle through the square tenon.

Further, the through hole vertically penetrates through the side surface of the first handle.

Further, the through hole is located in the middle of the first handle.

Further, the inner hole is perpendicular to the bottom of the first handle.

Furthermore, the square tenon is vertically arranged in the center of the bottom block, and the direction of the square tenon is opposite to that of the screwdriver head.

Furthermore, the inner hole on the first handle is connected with the second handle through being matched with the square tenon.

Furthermore, the through hole on the first handle is connected with the second handle through being matched with the square tenon.

The utility model provides a screwdriver compares with traditional screwdriver, the utility model provides a screwdriver is detachable screwdriver, both can use as traditional screwdriver, can dismantle the handle formula screwdriver of constituteing T type handle again, and the power of operator's palm directly promotes the handle, does not receive coefficient of friction's influence, raises the efficiency. Meanwhile, the T-shaped screwdriver fundamentally solves the problem of slipping, and the symmetrical force arms are adopted, so that the acting force which is generated during rotation and has no influence on the rotation can be offset. From the structure, do not increase extra spare part, optimize structure, use nimble, the mode switches convenience, sexual valence relative altitude.

Drawings

Fig. 1 is a first state diagram of the present invention.

Fig. 2 is a second state diagram of the present invention.

Fig. 3 is a partial schematic view of the present invention.

Fig. 4 is a partial sectional view of the present invention.

Fig. 5 is a structural diagram of the present invention.

Fig. 6 is a force application diagram of the present invention.

Fig. 7 is a force application diagram of the present invention.

Wherein, the handle 1; a first handle 2; a second handle 3; a through hole 4; an inner hole 5; a screwdriver head 6; a bottom block 7; a square tenon 8; a ratchet gear box 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate positional relationships between the relevant portions, and do not limit their absolute positions.

With reference to fig. 1 to 6, the screwdriver with adjustable force arm provided by the present invention comprises a handle 1, wherein the handle 1 is composed of a first handle 2 and a second handle 3, and the first handle 2 is provided with a through hole 4 and an inner hole 5; the second handle 3 is provided with a screwdriver head 6 and a bottom block 7; the bottom block 7 is fixed with the tail part of the screwdriver head 6; the bottom block 7 is provided with a raised square tenon 8; the first handle 2 is connected with the second handle 3 through the square tenon 8; the through hole 4 vertically penetrates through the side surface of the first handle 2; the through hole 4 is positioned in the middle of the first handle 2; the inner hole 5 is vertical to the bottom of the first handle 2; the square tenon 8 is vertically arranged in the center of the bottom block 7, and the direction of the square tenon is opposite to that of the screwdriver head 6; the inner hole 5 on the first handle 2 is connected with the second handle 3 through being matched with the square tenon 8; the through hole 4 on the first handle 2 is connected with the second handle 3 through being matched with the square tenon 8.

The utility model provides a screwdriver with adjustable arm of force, the main object of use is self-tapping screw, preferably but not limited, handle length 120mm, excircle diameter 30mm, the cross-sectional dimension of square tenon is 10X 10mm, the length of square tenon is 20mm, the above handle length is the length after first handle 2 is connected with second handle 3 through inner hole 5; referring to the mode of metal key connection, the square tenon 8 is made of manganese steel, and the handle is made of plastic used for common screwdrivers.

The utility model provides a arm of force adjustable screwdriver, the cross sectional shape of first handle respectively cuts a part for circular position at bilateral symmetry, forms a plane in both sides, and the 4 vertical planes of through-hole on the first handle 2 pass first handle 2.

In practice, the gripping force of the operator is spread over the entire circumference of the handle, and for the sake of calculation, it is simplified here to a point where the gripping force is concentrated on the circumference, and the driving torque of the conventional screwdriver and the T-screwdriver is calculated below with reference to fig. 1 to 7.

Referring to fig. 1 and 6, let N be the gripping force of the operator, L be the driving force arm (i.e. the radius of the screwdriver handle), and F be the driving force applied to the screwdriver handle;

the friction coefficient of the hand and the screwdriver handle is mu, the value of mu is found to be between 0.4 and 0.5 according to Baidu encyclopedia, and the intermediate value is 0.45;

radius of the screwdriver: 30/2=15, i.e. drive arm L = 15;

according to the following steps: driving force F = μ N;

obtaining: f = 0.45N;

then according to the following steps: t = F × L;

obtaining: t = 6.45N;

i.e. the drive torque of a conventional screwdriver is 6.45N.

With reference to fig. 2 and 7, the first handle 2 is removed and horizontally placed on the second handle 3 to form a T-shaped screwdriver, and the driving arm is enlarged;

the force applied to the screwdriver by the palm of an operator directly pushes the screwdriver without being influenced by the friction coefficient, and the holding force N of the operator is completely converted into a driving force F;

namely: f = N;

radius after first handle lay: 100/2= 50;

considering that in actual operation, the force application point is generally not at the top end of the handle rod, but at a position which is slightly inward, namely smaller than the radius, the length L of the force arm is 40;

driving torque: t = F × L;

obtaining: t = 40N;

the driving torque is 40N;

the driving torque of the T-shaped screwdriver/the driving torque of the traditional screwdriver; 40N/6.45N = 6.20.

Therefore, the conclusion can be drawn that after the screwdriver handle structure is recombined and changed into the force arm increasing mode, an operator can use the screwdriver handle structure to increase the force arm

The driving torque can be more than 6 times of the original driving torque under the condition of using the same force.

When adopting traditional screwdriver mode connected state, the utility model discloses an outer dimension and traditional screwdriver of screwdriver are identical completely, satisfy portable's demand. Compare traditional screwdriver, the utility model discloses a material that the screwdriver increases is a steel square tenon, and the material expense that from this increases is no longer than 5% of original material expense, all is suitable for under the multiple condition simultaneously.

The screwdriver with the adjustable force arm provided by the utility model can be applied by combining the ratchet gear box 9, and the ratchet gear box 9 is arranged at the lower section of the handle 1; the ratchet gear box 9 is a change ratchet gear box.

The utility model provides a ratchet gear box, wherein the ratchet mainly comprises initiative pendulum rod, pawl, ratchet, non return pawl and frame. The driving part is sleeved on the driven shaft fixedly connected with the ratchet wheel in an empty mode and is connected with the driving pawl through a revolute pair. When the driving piece swings anticlockwise, the driving pawl is inserted into a tooth groove of the ratchet wheel, the ratchet wheel rotates by a certain angle, and at the moment, the non-return pawl slides on a tooth back of the ratchet wheel. When the driving piece rotates clockwise, the non-return pawl prevents the ratchet wheel from rotating clockwise, and the driving pawl can slide on the back of the ratchet wheel teeth, so that the ratchet wheel is still. Therefore, when the driving part continuously swings back and forth, the ratchet wheel does unidirectional intermittent motion.

The rotating angle of the hands of an operator is limited, and the operator cannot turn the screw to the end once when rotating the screw, so that the ratchet gear box is arranged on the handle, and the problems caused by the fact that the operator cannot turn the screw to the end once can be solved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (7)

1. The utility model provides a screwdriver of arm of force adjustable which characterized in that: the handle comprises a first handle and a second handle, wherein the first handle is provided with a through hole and an inner hole; the second handle is provided with a screwdriver head and a bottom block; the bottom block is fixed with the tail part of the screwdriver head; the bottom block is provided with a raised square tenon; the first handle is connected with the second handle through the square tenon.

2. The screwdriver with adjustable moment arm according to claim 1, wherein: the through hole vertically penetrates through the side face of the first handle.

3. The screwdriver with adjustable moment arm according to claim 1, wherein: the through hole is located in the middle of the first handle.

4. The screwdriver with adjustable moment arm according to claim 1, wherein: the inner hole is vertical to the bottom of the first handle.

5. The screwdriver with adjustable moment arm according to claim 1, wherein: the square tenon is vertically arranged in the center of the bottom block, and the direction of the square tenon is opposite to that of the screwdriver head.

6. The screwdriver with adjustable moment arm according to claim 1, wherein: the inner hole on the first handle is connected with the second handle through the square tenon in a matched mode.

7. The screwdriver with adjustable moment arm according to claim 1, wherein: the through hole on the first handle is connected with the second handle through being matched with the square tenon.