Cutlery – Cutting tools – Saw
Patent
1980-08-08
1982-06-22
Peters, Jimmy C.
Cutlery
Cutting tools
Saw
56 105, 83 68, 192 3M, B27B 1702
Patent
active
043355145
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Heretofore the prior art used brake lever engagement to deactivate the electrical system of an ICE. Various other devices were used such as dead man switches and clutches. False tripping of the prior art shut-off devices could be a problem while clutches might react too slowly if used alone to prevent possible engine or motor damage. In any event, no prior art shut-off device was trigger associated so as to preclude subsequent false start-ups once braking had become necessary.
The problem is to use a shut-off system which requires resetting of the brake and/or actuating switch.
The present invention solves the prior art problem by positively requiring selective resetting of the brake and/or the actuating switch.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved switch-brake interlock for chain saw which overcomes the prior art disadvantages; which is simple, reliable and economical; which uses an actuator linked to the brake and operative therewith; which requires resetting of the actuator so that the brake must be off and the trigger released; which will shut off the power upon actuation of the brake; which uses a microswitch engageable by the actuator; which uses a trigger and microswitch requiring an intermediate actuator positionable to permit operation of the switch or to prevent such operation; which fulcrums the actuator during operation; which uses a shiftable link intermediate the trigger and the switch to permit or to prevent actuation therebetween; and which uses a shiftable link actuated responsive the position of the brake to permit or to prevent the trigger from being operable on the switch.
Other objects and advantages will be apparent from the following description of the invention, and the novel features will be particularly pointed out hereinafter in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention is illustrated in the accompanying drawings in which:
FIG. 1 is a perspective elevational view of a chain saw embodying the present invention.
FIG. 2 is a side elevational view, partially cut away to show the actuator in the position awaiting trigger depression to actuate the microswitch via the actuator.
FIG. 3 is a side elevational view, partially cut away to show the trigger depressed to pivot the actuator to operate the microswitch.
FIG. 4 is a side elevational view, partly cut away, showing the brake actuated by the forward position of the lever to shift the actuator to a remote "off" position.
FIG. 5 is a side elevational view, partly cut away, showing that trigger depression prevents restoration of the actuator to its FIG. 1 position, thereby preventing restarting or reoperation of the microswitch.
FIG. 6 is a schematic representation of another embodiment of the present invention.
FIGS. 7, 8, 9 and 10 are schematic representations of still another embodiment of the present invention wherein FIG. 7 corresponds to FIG. 2, FIG. 8 corresponds to FIG. 3, FIG. 9 corresponds to FIG. 4, and FIG. 10 corresponds to FIG. 5.
DESCRIPTION OF THE INVENTION
A portable power driven chain saw 12 is shown in FIG. 1 and embodies the present invention, wherein a preferred embodiment thereof is illustrated in FIGS. 2 through 6, and a second embodiment is illustrated in FIGS. 7 through 10.
The chain saw 12 depicted in FIG. 1 has a housing 14 from which a guide bar 16 extends forwardly therefrom and is mounted to the housing 14 at a guide pad 17 shown in FIG. 3 by means of a fastener 20. An endless saw chain 22 is entrained on the guide bar 16 to be driven by a suitable motive means as, for example, an electric motor (not shown) housed in a motor casing 24 to drive an output shaft 26 carrying a drive sprocket 28 to which the saw chain 22 is connected as shown only in FIG. 2, and inboard thereof a brake drum 30 about which is disposed a brake band 32 of a brake system 34 best seen in FIG. 3. The braking system has a brake lever 36 pivotally connected to the housing 14 at 38 below the pad 17, and an upper transverse integral
REFERENCES:
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patent: 4309862 (1982-01-01), Carlson
Dynie Ernest R.
Overy Colin
Black & Decker Inc.
Murphy Edward D.
Ottesen Walter
Peters Jimmy C.
Weinstein Harold
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