GB2100161A

GB2100161A - Screwdrivers

Info

Publication number: GB2100161A
Application number: GB8121278A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-03-17
Filing date: 1981-07-10
Publication date: 1982-12-22
Also published as: GB2100161B

Abstract

A screwdriver, in which by a separate turning motion performed by one hand and locating pressure by the other of the operator's hands, a firm and accurate engagement in the screw head is achieved, has a dome at the rear end. The distance between the dome and a lever inserted in the body prevents the action of the operator's hands from impeding each other. By means of mechanical advantage, exerted through the lever the operator's effort is increased. <IMAGE>

Description

SPECIFICATION Leverage-assisted screw-driver This artefact is designed for the tightening and loosening of screws.

The implement consists of a metal shaft, a rotating dome and a bar for leverage.

The shaft is flat for approximately half its length, its width being approximately four times greater than its thickness.

In the half of this flat section of the shaft which is nearer to the mid point of the entire shaft there is a round hole drilled through from one side of the wider face of the shaft to the other.

The remaining portion of the shaft is round in section tapering from the flat portion, with the exception of the last fifth (approximately) of its length which is flattened into a wedge shape suitable to be inserted into the head of a screw so as to turn it.

At the opposite end of the shaft from the wedge section for insertion into the head of a screw, a dome of suitable size and shape to rest in the palm of a human hand, is attached in such a way that it rotates through 360 , clockwise or anti-clockwise. The base line of this dome is parallel with the end of the shaft.

A bar, circular in cross-section, of approximately the same length as the shaft accompanies the above described. This bar is of slightly smaller diameter than that of the hole -bored into the shaft. There is a dome on one end of this bar whose base is the same dimension as the width of the greater face of the flattened section of the shaft. The bar contains a hole in its shaft to take a pin to retain it.

A. In addition to the above, there is a sophistication whereby the rounded part of the shaft, close to the flat-section, may end in attachment. This attachment can hold a variety of screw-driver bits to fit any size or type of screw. The attachment allows for the insertion, secure holding and removal of the above-mentioned screw-driver bits in this context a screw-driver but is defined as that which is suitably shaped at one end to turn a screw and at the other to be held in the shaft of the leverage screw-driver.

B. In addition to the above, there is a simplification whereby the dome which is shaped to fit in the hand is fixed, being integral with the shaft and not revolving.

C. In addition to the above, there is a refinement whereby a ratchet is incorporated.

The ratchet has three settings for clockwise, anti-clockwise and fixed position use of the screw-driver. (See Fig. 5pn page 6).

I claim, according to the following, screwdrivers which incorporate lever operation.

I claim: 1. A screwdriver, according to any preceding claim, which incorporates a dome to be held in the palm of the operator. This dome is fixed to the shank so that it turns with the latter.

2. A screwdriver, according to any preceding claim, which incorporates a dome capable of rotation through 360 degrees, clockwise or anticlockwise, relative to the shank to which it is connected. This rotating dome is to be held in the palm of the operator.

3. A screwdriver, according to any preceding claim, in which the dome is connected to a shank in which a lever is fitted. For ease of storage, this lever is detachable.

4. A screwdriver, according to any preceding claim, in which the drive is transmitted direct by means of a lever.

5. A screwdriver, according to any preceding claim, in which the drive is transmitted by means of a lever via a three-setting ratchet with clockwise, anticlockwise and fixed positions.

6. A screwdriver, according to any preceding claim, in which the operative end is designed for use with screws of one given head shape and slit (kerf) or slits (kerfs) in these screw heads.

7. A screwdriver, according to any preceding claim, in which the end of the shank is designed to hold a range of detachable bits which are suitable for use with screws of different head shapes and slits (kerfs).

8. Screwdrivers, as claimed in any preceding claim and substantially as herein described, with reference to and illustrated by the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Leverage-assisted screw-driver This artefact is designed for the tightening and loosening of screws. The implement consists of a metal shaft, a rotating dome and a bar for leverage. The shaft is flat for approximately half its length, its width being approximately four times greater than its thickness. In the half of this flat section of the shaft which is nearer to the mid point of the entire shaft there is a round hole drilled through from one side of the wider face of the shaft to the other. The remaining portion of the shaft is round in section tapering from the flat portion, with the exception of the last fifth (approximately) of its length which is flattened into a wedge shape suitable to be inserted into the head of a screw so as to turn it. At the opposite end of the shaft from the wedge section for insertion into the head of a screw, a dome of suitable size and shape to rest in the palm of a human hand, is attached in such a way that it rotates through 360 , clockwise or anti-clockwise. The base line of this dome is parallel with the end of the shaft. A bar, circular in cross-section, of approximately the same length as the shaft accompanies the above described. This bar is of slightly smaller diameter than that of the hole -bored into the shaft. There is a dome on one end of this bar whose base is the same dimension as the width of the greater face of the flattened section of the shaft. The bar contains a hole in its shaft to take a pin to retain it. A. In addition to the above, there is a sophistication whereby the rounded part of the shaft, close to the flat-section, may end in attachment. This attachment can hold a variety of screw-driver bits to fit any size or type of screw. The attachment allows for the insertion, secure holding and removal of the above-mentioned screw-driver bits in this context a screw-driver but is defined as that which is suitably shaped at one end to turn a screw and at the other to be held in the shaft of the leverage screw-driver. B. In addition to the above, there is a simplification whereby the dome which is shaped to fit in the hand is fixed, being integral with the shaft and not revolving. C. In addition to the above, there is a refinement whereby a ratchet is incorporated. The ratchet has three settings for clockwise, anti-clockwise and fixed position use of the screw-driver. (See Fig. 5pn page 6). CLAIMS I claim, according to the following, screwdrivers which incorporate lever operation. I claim:

1. A screwdriver, according to any preceding claim, which incorporates a dome to be held in the palm of the operator. This dome is fixed to the shank so that it turns with the latter.