DE202007017548U1 - chainsaw - Google Patents

Abstract

Chainsaw, comprising
a housing,
a drive device included in the housing,
a saw chain, which is driven by the drive device, and
a lubrication system including a lubricant tank, a pump connected to the lubricant tank, and a lubricant alarm system,
characterized in that the lubricant alarm system comprises a photosensitive detector comprising a light source and a photosensitive member disposed opposite to each other, the photosensitive member being capable of receiving light emitted from the light source and accordingly send out a corresponding signal.

Description

Field of the invention

The The present invention relates to a chain saw, and more particularly a lubrication alarm system of a chainsaw.

Background of the invention

The Chainsaw is among the most commonly used Garden tools and can be used for cutting branches and trunks be used.

A Chainsaw typically includes a housing, Drive means, at least one handle and a chain, which is driven by the drive means. Generally, the includes Chainsaw further a lubrication system for supplying the Chain with a lubricant. The lubrication system includes a Lubricant tank, a pump and a pipe for connecting the lubricant tank and the pump.

The U.S. Pat. No. 3,717,221 discloses a chain saw having a lubricant alarm system. The lubricant alarm system comprises a simple circuit composed of a light indicator and a switch, the switch being in engagement with the outer end of the piston of the lubricant pump. In the normal situation, the pump contains sufficient lubricant and the switch is kept open with the light indicator off. If there is a lack of lubricant in the pump, the switch is closed in response to the piston descending, turning on the indicator light to remind the operator.

Of the Disadvantage of the above lubricant alarm system is that it is not is sensitive enough. The lubrication system becomes friction between the piston and the pump possibly due a change in the smoothness between and the viscosity changed the lubricant, so that the position of the piston the amount of lubricant can not match exactly. It is possible that the switch is still kept open, if there is no lubricant in the pump. It is further possible that the lubricant set a drop in the piston prevents even if there is no lubricant in it, and the lubricant alarm system is thus an incorrect one to the operator Information delivers. If a chainsaw often without lubricant, it is damaged or shorten their lifespan.

Summary of the invention

It It is an object of the present invention to overcome the disadvantages of the prior art overcome the technique and an improved chainsaw with a highly sensitive lubricant alarm system.

The Chainsaw of the present invention comprises a housing, at least one handle, which is attached to the housing is, a drive means which contained in the housing is a saw chain, which is driven by the drive means will, and a lubrication system. The lubrication system includes a Lubricant tank and a pump which is connected to it. The Chainsaw also includes a lubricant alarm system, wherein the lubricant alarm system is a photosensitive detector comprising a light source and a photosensitive element, which is arranged opposite the light source comprises, wherein the photosensitive element detects the light passing through the light source is emitted, and generates a corresponding signal.

Of the light-sensitive detector, the lubricant tank and the pump are mechanically independent, so the sensitivity is increased. Thus, the operator can reliably be warned in the case of a lack of lubricant to an abnormal Damage to the chainsaw should be avoided.

Short description of the drawing

The The present invention will become apparent from the following detailed description of the preferred embodiment of the invention, which is shown in the accompanying drawing, it can be seen in which:

1 a perspective view of a chain saw of the preferred embodiment according to the present invention;

2 a perspective view of the chainsaw in 1 is, wherein a part of the housing is shown broken through; and

3 a block diagram of the lubricant alarm system of the chain saw is.

Detailed description of the preferred embodiment

1 and 2 put a chainsaw 10 an embodiment according to the present invention. The chainsaw 10 includes a housing 1 , a motor 2 which is in the housing 1 included is an auxiliary handle 3 and a main handle 4 , which is attached to the housing were brought. A saw chain, which is not shown in the drawing, is on a guide plate 5 attached and can by the engine 2 for movement along the circumference of the guide plate 5 are driven to perform a cutting operation.

According to 2 is a lubricant tank 6 in the case 1 inserted, which is connected to a pump (not shown). The pump is suitable for supplying a lubricant to the saw chain. A closed and transparent container 7 is under the tank 6 arranged and is clearly smaller than the tank 6 , The container 7 has a first opening 71 and a second opening 72 which are defined on the one side outer surface thereof, wherein the second opening 72 under the first opening 71 and to the bottom of the container 7 is arranged adjacent. The container 7 is with the pump through a first pipe 74 connected, which with the first opening 71 connected, and is with the tank 6 through a second tube 73 connected, which with the second opening 72 connected is. With such an arrangement, the lubricating oil flows in the tank 6 through the second tube 73 in the container 7 and then flows through the first tube 74 into the chamber of the pump.

The chainsaw 10 further comprises an alarm system comprising a photosensitive detector 8th and an indicator light 9 includes. The indicator light 9 is from an opening 11 protruding on the housing 1 arranged to indicate if there is lubricant in the tank. Preferably, the indicator lamp 9 arranged at a position which faces the operator during operation, so that the indicator lamp 9 can be easily observed. In the present embodiment, the indicator lamp is a light-emitting diode which can emit red visible light.

According to 3 includes the photosensitive detector 8th a photosensitive element 81 and a light source 82 , wherein the photosensitive element 81 a photodiode, a phototriode, a photovaristor or other suitable photosensitive elements. When the photosensitive element 81 the light coming from the light source 82 is emitted, it outputs a signal in response to the received light intensity. Preferably, the light source 82 an infrared light emitting diode, which can prevent the photosensitive element 81 by the other visible light in the housing 1 can be influenced.

A power supply terminal of the photosensitive detector 8th , which is denoted by Vcc, is connected to an electric power source. In some embodiments, the power source is connected to an AC power (hereinafter AC power) with which the chainsaw 10 is supplied. When the chainsaw 10 is powered, the AC power flows through a current limiter 83 , a rectifier 84 and a regulator 85 and then becomes a DC power to power the light source 82 , the photosensitive element 81 , a comparison circuit 86 and the indicator light 9 transformed. The transparent container 7 is between the photosensitive element 81 and the light source 82 arranged. The indicator light 9 is about the comparison circuit 86 with the photosensitive element 81 connected.

If some lubricant in the container 7 is present, the light is emitted by the light source 82 is emitted, shielded by the lubricant, so that the photosensitive element 81 the light can not receive. In this situation, the signal passing through the photosensitive element 81 is transmitted, constant or changed within a predetermined range. If a lack of lubricant in the container 7 is present, so that the light, which is due to the light source 82 is emitted through the transparent container 7 runs and through the photosensitive element 81 is received, the signal passing through the photosensitive element 81 is changed in response to the received light intensity.

The comparison circuit 86 is suitably adapted to the output signal of the photosensitive element 81 compare with a comparison signal and determines if lubricant is in the tank 6 is present, according to the comparison result. If the lubricant is missing, the comparison circuit sends 86 a signal to operate the indicator lamp 9 which alerts the operator. Otherwise the indicator light will turn on 9 kept off.

The The present invention is not limited to the embodiments disclosed above limited. For example, the indicator light may be light emit a different color. Furthermore, the indicator light can through another suitable alarm device can be replaced, such as an acoustic device, a vibrating device or a other visual alarm indicator. Any replacement devices and modifications according to the principle of the present Invention are given as under the appended claims of the present invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 3717221 [0004]

Claims (11)

A chain saw comprising a housing, a drive device contained in the housing, a saw chain driven by the drive device, and a lubrication system including a lubricant reservoir, a pump connected to the lubricant reservoir, and a lubricant alarm system characterized in that the lubricant alarm system comprises a photosensitive detector comprising a light source and a photosensitive element disposed opposite each other, the photosensitive element being capable of receiving light emitted from the light source and accordingly send out a corresponding signal. Chainsaw according to claim 1, characterized that it further comprises a transparent container which disposed between the light source and the photosensitive element and in connection with and between the tank and the pump is. Chainsaw according to claim 2, characterized that the tank, the transparent container and the pump are connected by pipes. Chainsaw according to claim 2, characterized that the transparent container is obviously smaller than the tank is. Chainsaw according to claim 3, characterized that the transparent container is under the tank. Chainsaw according to claim 1, characterized in that the photosensitive detector further comprises a comparison circuit which is designed to be a warning signal in response to send out the signal sent by the photosensitive element. Chainsaw according to claim 6, characterized that the warning signal is able to actuate an alarm device. Chainsaw according to claim 7, characterized in that the alarm device has a first state and a second state State, the first state corresponding to a situation, in the amount of lubricant in the tank above a predetermined value, and the second state of another situation corresponds to the amount of lubricant in the tank below is the predetermined value. Chainsaw according to claim 8, characterized in that the alarm device comprises a light-emitting diode which in the Able to emit visible light. Chainsaw according to claim 1, characterized that it further comprises an energy source, the energy for supplies the lubricant alarm system. Chainsaw according to claim 10, characterized that the power source supplies an AC power, and that the photosensitive detector means for converting AC to DC includes.