CN201020754Y

CN201020754Y - Chain saw

Info

Publication number: CN201020754Y
Application number: CNU2006201652041U
Authority: CN
Inventors: 巫红卫; 高崇
Original assignee: QUANFENG (CHINA)INTERNATIONAL TRADE CO Ltd
Current assignee: QUANFENG (CHINA)INTERNATIONAL TRADE CO Ltd
Priority date: 2006-12-18
Filing date: 2006-12-18
Publication date: 2008-02-13
Anticipated expiration: 2016-12-18
Also published as: FR2910111B3; FR2910111A1; DE202007017548U1

Abstract

The utility model discloses a chain saw mainly used to horticultural cutting. The chain saw comprises a shell, a driving device located in a shell, at least a handle arranged on the shell, a chain driven by a driving device as well as a lubricant supply system, wherein the lubricant supply system comprises a lubricant tank arranged in the shell and an oil pump connected with the oil tank to supply the chain with the lubricant; the chain saw also comprises an oil level alarming system; the oil level alarming system comprises a photosensitive testing device; and the photosensitive testing device comprises a light source and a photosensitive element that tests the light ray radiated from the light source and outputs corresponding signal. When the oil tank is out of lubricant, the chain saw can timely and accurately issue the alarm signal to remind the user to add the lubricant into the oil tank, so as to ensure the normal operation of the chain saw.

Description

A kind of chain saw

Invention field

The utility model relates to a kind of chain saw, relates in particular to a kind of chain saw that has the lubricant level warning system.

Background technology

Chain saw is generally used for cutting branch and trunk as a kind of gardens class instrument.

Chain saw comprises casing, drive unit usually, is positioned at least one handle on the casing, and drives the chain that cuts by drive unit.General, the fuel tank of storage lubricating oil and the oil pump that is connected with fuel tank are housed in the chain saw casing, fuel tank is delivered to oil pump by oil pipe with lubricating oil, oil pump and chain are adjacent and will be to the chain supplying lubricating oil being used for lubricated chain, thereby prevent to be rapidly heated and to damage because of the dry friction between chain and other elements or frictional force increase the main parts size that causes chain saw.

The patent No. is US3,717,221 United States Patent (USP) has disclosed a kind of chain saw that has the lubricant level warning device, this chain saw comprises the oil level warning device of a dynamo-electric combination, this device further comprises the circuit that simply has indicator lamp and switch, and this switch is connected with external part on the oil pump piston.When in the oil pump lubricating oil being arranged, the oil pressure of generation promotes piston, by its external part switch is remained on off-state, and this moment, circuit was in off state, and indicator lamp does not work.On the contrary, when not having lubricating oil in the piston, when promptly not having oil pressure, piston shrinks in oil pump, and the external part of piston drives switch closure, and this moment, circuit was connected, and indicator lamp is bright, reminds the user need add lubricating oil in fuel tank.

The structure of this lubricant level warning device is simpler, but its insufficient sensitivity.Frictional force between piston and the oil pump inner chamber may change and constantly change because of the smooth degree on the two surface own and the stickiness of lubricating oil, therefore oil pressure or the oil mass that the piston position of oil pump usually can not accurate response oil pump inside do not have lubricating oil in the oil pump probably and the external part of piston still remains on off-state with switch.In addition, when oil pump is long-time use after, even oil pump inside has not had lubricating oil, but the residual dregs of its inside also might cause the external part of piston that switch is remained on open position, thus the information that causes warning device to be given making mistake.In case lack lubricating oil on the chain, thereby will increasing even produce the dry friction phenomenon, the frictional force between chain and other elements causes shortening chain service life, serious even main parts size that can cause chain saw is rapidly heated and damages.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of chain saw that has improved is provided, and this chain saw comprises the fuel level alarm system of a sensitivity.

The chain saw that the utility model discloses comprises: comprise: a casing, handle is housed on the casing, one drive unit is positioned at casing, and be connected with a chain drive, a lubricating oil feed system is loaded in the casing, this lubricating oil feed system comprises a lubricating oil fuel tank and an oil pump that is connected with fuel tank, this chain saw also comprises a fuel level alarm system, this fuel level alarm system comprises a photosensitive detector, this photosensitive detector comprises a light emitting source, a light-sensitive element that detects the light emitting source emitted light and export corresponding signal, light emitting source is relative with the position of light-sensitive element.

By the employing photosensitive detector, and make the frame for movement of photosensitive detector and fuel tank and oil pump itself separate, make the sensitivity of warning system greatly increase.Chain saw of the present utility model just can accurately detect the oil level of fuel tank by the warning system that adopts this sensitivity and in time remind the operator to add lubricating oil when the lubricating oil in the fuel tank flows to end, thereby improves the service life of chain and chain saw.

Description of drawings

Below in conjunction with accompanying drawing and by embodiment the utility model is further set forth.

Fig. 1 is the schematic perspective view of the chain saw among a kind of first-selected embodiment of the present utility model.

Fig. 2 is the partial sectional view of chain saw among Fig. 1.

Fig. 3 is the circuit block diagram of photosensitive detector of the oil level warning device of the chain saw among this first-selection embodiment.

The specific embodiment

As Figure 1-3 be chain saw 10 among a kind of first-selected embodiment of the present utility model.Chain saw 10 comprises a casing 1, a motor 2 is positioned at casing 1, front handlebar 3 and back handle 4 are installed in respectively on the casing 1 (can certainly make one with casing 1), the chain (not showing among Fig. 1) that is driven by motor 2 is installed on the guide plate 5, and can rotate, thereby carry out cutting action around the outer rim of guide plate 5.In other embodiments, motor can also be substituted by the drive unit of other types, fluid power motor for example, air motor etc.

Casing 1 inside is equipped with the fuel tank 6 of storage lubricating oil and the oil pump (not shown) adjacent with chain.In suitable, oil pump offers chain so that it is lubricated with lubricating oil.A sealing, volume obviously is positioned at the below of fuel tank 6 than fuel tank 6 little transparent vessels 7, on the side of container 7 two

holes

71,72 are arranged, hole 72 is positioned at the below in hole 71, and near the bottom surface of container 7.Transparent vessel 7 is connected with oil pump by hole 71 and oil pipe 74, and passes through hole 72 and oil pipe 73 and be connected with fuel tank 6.In this way, the lubricating oil in the fuel tank 6 can flow in the container 7 by oil pipe 73, flows into oil pump by oil pipe 74 again.

Chain saw 10 also comprises a fuel level alarm system that utilizes light sensitive effect, and this fuel level alarm system is made up of two parts: a photosensitive detector and an indicator lamp 9 that is connected with this checkout gear.Indicator lamp 9 is used for showing to the operator state of fuel tank 6 lubricant level, and it is positioned at the top of casing 1, and stretches out the aperture from casing 1 11.In use, indicator lamp 9 faces the user, makes it can observe the state of indicator lamp 9 easily, thereby knows the oil level state in the fuel tank 6.In the present embodiment, indicator lamp 9 is first-selected for sending the light emitting diode of red visible light.

Photosensitive detector comprises a light-sensitive element 81 and an illuminating source 82.Light-sensitive element can be the light-sensitive element of photodiode, phototriode, photo resistance and other adequate types.When light-sensitive element 82 receives the light that light source 82 sends, the corresponding output signal of intensity of light-sensitive element 82 one of output and received light.The first-selected infrarede emitting diode that adopts of illuminating source is with the influence of the visible light in the minimizing casing to light-sensitive element.Certainly this light source also can adopt visible light emitting diode.First-selected ground, the power end Vcc of photosensitive detector links to each other with the input of the AC power of chain saw 10.When chain saw 10 energising, alternating current through current-limiting apparatus 83, fairing 84, stable-pressure device 85 after, the alternating current of chain saw power supply is converted to direct current and offers light source 82, comparison circuit 86 and indicator lamp 9.Transparent vessel 7 is between light-sensitive element 81 and light source 82.Indicator lamp 9 is connected with light-sensitive element 81 by a comparison circuit 86.The AC power of chain saw 10 gives light-sensitive element 81 power supplies after becoming DC voltage V by AC-DC conversion.

When the lubricating oil in the container 7 reach a certain height, the light that lubricating oil obstruction light source 82 is sent propagated on the light-sensitive element 81, and this moment, the output signal of light-sensitive element 81 was a constant or fluctuation within the specific limits.When the lubricating oil in the container is few when passing transparent vessel 7 to the light that to a certain degree makes light source 82 be sent and arriving on the light-sensitive elements, the corresponding variation takes place according to the light intensity of received light in the output signal of light-sensitive element 81.Comparison circuit 86 compares output signal and a contrast signal of light-sensitive element 82, and judges according to the result who relatively obtains whether the lubricating oil in the transparent vessel 7 lacks the degree of adding lubricating oil to the needs operator in fuel tank.In case the lubricating oil in the container 7 is few to the degree that need add lubricating oil in fuel tank, alarm signal of comparison circuit 86 outputs triggers indicator lamp 9 and lights, and with the prompting operator, otherwise indicator lamp 9 keeps extinguishing usually.Certainly, also can be set in of short duration once bright of indicator lamp when connecting power supply 9, normal with expression indicator lamp 9.

Those of ordinary skill in the art can be easy to expect, as an indicating device, all right more than one of indicator lamp in the present embodiment also can be the light emitting diode that can send other colors, and light emitting diode can also substitute with the suitable sources of other types.In other embodiments, can also substitute indicator lamp with the indicating device of other adequate types, for example various sound-producing devices or the vibration generating arrangement that handle is vibrated for the chain saw that has LCDs, can also be indicated with symbol on the liquid crystal display or image.For light source 82 and light-sensitive element 81, indicator lamp 9, can also with the AC power of chain saw independently direct current it is powered.

The chain saw that the utility model disclosed is not limited to frame mode mentioned above and shown in the drawings.Those of ordinary skill in the art can recognize to also have a lot of conspicuous alternative or alter mode easily on basis of the present utility model.These conspicuous alternative and alter mode are all within the utility model scope.

Claims

1. chain saw, comprise: a casing, handle is housed on the casing, one drive unit is positioned at casing, and be connected with a chain drive, a lubricating oil feed system is loaded in the casing, described lubricating oil feed system comprises a lubricating oil fuel tank and an oil pump that is connected with described fuel tank, described chain saw also comprises a fuel level alarm system, it is characterized in that, described fuel level alarm system comprises a photosensitive detector, and described photosensitive detector comprises a light emitting source, a light-sensitive element that detects described light emitting source emitted light and export corresponding signal, light emitting source is relative with the position of light-sensitive element.

2. chain saw as claimed in claim 1 is characterized in that, described fuel level alarm system also comprises a transparent vessel that is connected between described fuel tank and the described oil pump, and described transparent vessel is between described light emitting source and described light-sensitive element.

3. chain saw as claimed in claim 2 is characterized in that, described fuel tank, described transparent vessel and described oil pump connect by oil pipe.

4. chain saw as claimed in claim 2 is characterized in that described transparent vessel volume is significantly less than the volume of described lubricating oil fuel tank.

5. chain saw as claimed in claim 3 is characterized in that, described transparent vessel is positioned at described fuel tank below.

6. as each described chain saw among the claim 1-5, it is characterized in that the output signal that described photosensitive detector also comprises a described light-sensitive element of response judges whether to send the comparison circuit of alarm signal.

7. chain saw as claimed in claim 6 is characterized in that, described fuel level alarm system also comprises the indicating device that a described alarm signal of response provides the indication of reporting to the police.

8. chain saw as claimed in claim 7 is characterized in that, described indicating device has one and shows that the alarm condition and of not having oil in the described fuel tank shows the non-alarm condition that oil is arranged in the described fuel tank.

9. chain saw as claimed in claim 8 is characterized in that, described indicating device comprises one and is positioned at the light emitting diode that can send visible light on the described casing.

10. chain saw as claimed in claim 8 is characterized in that, described photosensitive detector comprises one and gives the ac-dc converter circuit of at least one power supply in described light emitting source and the light-sensitive element.