DE20120209U1 - hacksaw - Google Patents

Description

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Hacksaw

The innovation concerns the design of the handle on hacksaws. Hacksaws consist of the saw bow, usually made of pipe, the saw blade and a clamping device by which the saw blade is clamped between the ends of the spring-elastic saw bow. One end of the saw blade is hooked onto one end of the saw bow, possibly via an intermediate link, the other end is hooked onto the clamping device, possibly also via an intermediate link. The clamping device is usually designed as a toggle lever which is hingedly attached to the second end of the saw bow. The toggle lever is usually made of sheet metal and the lever arm is half-shell-shaped, with the side facing away from the bow, the back of the lever arm, being convexly curved. The toggle lever is operated by hand to tighten or release the saw blade.

When the sawblade is tensioned, the lever arm of the knee lever rests on the saw bow and slightly encloses it with its side flanks. When using the saw, the lever arm is grasped by the hand in such a way that the back of the lever arm rests on the palm of the hand and the fingers grip the saw bow. Because of the half-shell-like design of the lever arm, it cannot be designed ergonomically; the back is relatively narrow and causes unpleasant pressure sensations and pressure points in the palm of the hand when working with the saw. If the back were made wider, the side edges would be unpleasantly noticeable in the palm of the hand and on the fingers resting on it.

The fingers also do not have a good grip when gripping the saw bow and with each stroke when pulling the saw back during a cut, unpleasant pressure sensations are triggered on the inside of the fingers. To reduce this, some saws have a half-shell-shaped plastic handle on the inside of the saw bow. However, this still does not result in an ergonomically optimal handle design.

The task is to provide hacksaws with a handle that can be designed ergonomically as optimally as possible. According to the innovation, this task is solved in such a way that the lever arm of the knee lever does not serve as a handle, but a handle is attached to the saw bow that only serves as a handle and is ergonomically designed free of any other functions.

The handle is located either on the side of the saw bow opposite the clamping device or on the same side of the saw bow but above the clamping device.

This handle is preferably made of plastic or rubber. Handles made of plastic can also consist of a core handle made of hard plastic with a soft plastic cover. In one design, the handle is connected directly to the saw bow by overmolding the saw bow or by attaching and gluing it.

In another design, a connecting piece made of metal or plastic is attached to the saw bow and the handle to this connecting piece. The connecting piece and the handle can be designed in such a way that the handle is permanently attached to the connecting piece, for example by gluing, but in one variant both parts can also be designed in such a way that the handle is replaceable. This can be made possible by the connecting piece being firmly connected to the saw bow on one side and having a cantilevered arm at the top and bottom on the opposite side, between which the handle is clamped. The handle has a hole running lengthwise for this purpose and the arms of the connecting piece also have holes in their end area. A bolt runs through these holes and the hole in the handle, which has a head plate at one end and a thread for attaching a nut at the other end. The handle is clamped between the arms by tightening the nut. By shaping the front sides of the handle and corresponding concave shaping in the arms of the connecting piece, a positive connection between the handle and the connecting piece can be achieved. The described method of connecting the handle and saw bow using a connecting piece is an example; it can also be done in other ways.

The drawings show the object of innovation as an example:

Fig. 1 shows a hacksaw with the handle on the side of the saw frame

is arranged opposite the knee lever.

This includes:

(1) the saw bow

(2) the saw blade

(3) the toggle lever of the clamping device

(4) the intermediate link from the knee lever to the saw blade

(5) the intermediate plate on the other side of the saw frame to the saw blade

(6) the handle of the saw bow

Fig. 2 shows a hacksaw where the handle is above the knee lever

is arranged. It includes:

(1) the saw bow

(2) the saw blade

(3) the toggle lever of the clamping device

(4) the intermediate link from the knee lever to the saw blade

(5) the intermediate plate on the other side of the saw frame to the saw blade

(6) the handle of the saw bow 25

Fig. 3 shows the part of a hacksaw with the clamping device and the

Handle that is connected to the saw frame by a connector. It contains:

(1) the saw bow (2) the saw blade

(3) the knee lever of the clamping device (6) the handle of the saw bow (7) the connecting piece (8th) the arms of the connector •ϕ
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In this example construction, the connecting piece (7) is screwed to the saw bow (2) and the handle (6) is attached between the arms (8') and (8"). The type of attachment is not shown in detail.

Claims (5)

1. Hacksaw with replaceable saw blade and a clamping device for the saw blade ( 2 ), characterized in that the handle ( 6 ) of the hacksaw is attached to the saw bow ( 1 ) separately from the clamping device. 2. Hacksaw according to claim 1, characterized in that the handle ( 6 ) is mounted on the side of the saw bow ( 2 ) which is opposite the clamping device. 3. Hacksaw according to claim 1, characterized in that the handle ( 6 ) is arranged above the knee lever ( 3 ) on the saw bow ( 1 ). 4. Hacksaw according to claims 1-3, characterized in that the handle is connected to the saw bow by a connecting piece, wherein the handle is attached to the connecting piece in a non-detachable or detachable and replaceable manner. 5. Hacksaw according to claims 1-3, characterized in that the handle is designed according to ergonomic requirements for good haptics.