US3098511A - Auxiliary handle and chain guard for power chain saws - Google Patents

Description

y 1963 P. c. CONSOLETTI 3,098,511

AUXILIARY HANDLE AND CHAIN GUARD FOR POWER cum SAWS Filed Oct. 10. 1960 IN V EN TOR. PAUL C, CONSOI. E TTI.

A TTORNE Y United States Patent 3,098,511 AUXILIARY HANDLE AND CHAIN GUARD FOR POWER CHAIN SAWS Paul C. Consoletti, Milford, Mass., assignor to Draper Corporation, Hopedale, Mass., a corporation of Maine Filed Oct. 10, 1960, Ser. No. 61,578 1 Claim. (Cl. 14332) This invention pertains to power chain saws and more especially to an auxiliary handle and chain guard that can when required be easily assembled to the outer tip or nose portion of a saw guide bar.

It is an object of the invention to provide a combined auxiliary handle and chain guard which can be quickly attached or detached from the outermost tip of a saw guide bar without the use of tools.

It is a further object to provide an open channel in the guard assembly which while allowing chips and sawdust to escape freely does not depart from the intended safety feature of the guard.

It is still a further object to provide a combined hand nut and guard disc that is less likely to be lost should it be inadvertently displaced during attaching or detaching the same to the bar.

It is a further object to simplify the method of molding in manufacture of the invention through elimination of the flange which would normally be cast as an integral part of the known unitary type handle and chain guard devices that form a pocket into which the tip of the bar assembles.

Power chain saw operators under normal operating conditions very often require the assistance of a helper to direct and control the free end of the guide bar and chain. This is accomplished by attaching to the outer tip of the bar an auxiliary handle such as those disclosed in United States patents 2,432,567 and 2,910,099 and which can be easily detached from the bar in order to withdraw the bar endwise from the kerf. Although the auxiliary handles most widely used on present-day chain saws are quickly and easily attachable or detachable, they do not provide the simplicity and safety features afforded by the instant invention. Applicants combined auxiliary handle and chain guard simply comprises two detachable members which when assembled on the guide bar are connected by means of a ribbed neck bolt that is centrally anchored in the main housing and which passes through the bar to receive the second member. The second member being a combined hand nut and guard disc is adapted to cover the saw bar and chain afiording the maximum amount of safety and yet leaving an open channel of sufiicient width to prevent the accumulation of chips and sawdust.

The invention will be described in greater detail in the following disclosure wherein reference is made to the accompanying figures of drawing in which:

FIG. 1 is a side elevational view showing the invention applied to the outer tip of the saw guide bar.

FIG. 2 is a plan view of the invention partially in section showing the two detachable members assembled to the saw guide bar.

The invention as illustrated in FIG. 1 is assembled to a common type saw guide bar around the periphery of which and in the direction of the indicating arrows ice a saw chain 11 comprising a plurality of interconnecting routers 12 are designed to travel.

The auxiliary handle and chain guard comprising the invention is composed of two cooperating members. The first member or main housing is generally indicated by numeral 13 and the second member (a combined hand nut and guard disc is indicated generally by the numeral 14. The main housing 13- being generally circular in shape is provided with a semi-circular flange 15 that protrudes at a right angle from the outer edge of base 16. Integnal with and intermediate the ends of flange 15 an outwardly extending handle 17 is provided for controlling the free end of the saw. Centrally located within the main housing 13 and partially surrounded by surface 16 there is a raised surface or boss 18 which extends to the side of the main housing 13 opposite the flange 15. There is assembled and anchored in boss 18 a threaded stud 19 or as illustrated in FIG. 2, a ribbed neck bolt and immediately adjacent thereto at least one locating pin 20. Stud 19 is so located in boss 18 as to position it centrally in the main housing 13.

The saw guide bar 10 having appropriate holes (not shown) in the tip of the bar is adapted to receive the threaded stud 19 and the locating pin 20. The locating pin 20 passes through the guide bar 10 a sufficient distance to assure proper positioning of the guide bar. The threaded stud 19 extends through and beyond one face of the guide bar 10 a distance sufiicient to receive the combined hand nut and guard disc 14 which as illustrated in FIG. 2 comprises a centrally located internally threaded hole 21 in the hub 22, a guard disc 23 that is formed integral with said hub and extends above said disc terminating in the form of a gripping knob 24 for assembly or disassembly by hand and without the aid of tools.

When assembled the guide bar 10 bears against the boss 18. The locating pin 20 and threaded stud 19 pass through holes in the tip of the bar and the threaded stud 19 is adapted to receive the combined hand nut and guard disc 14 which when tightened bears against the opposite face of the bar. As shown in FIG. 2 ample clearance is provided for the saw chain due to the guide bar being seated on boss 18 allowing the tip of the bar and chain to overlie base 16. Additionally, the guard disc which is formed at a point approximately midway between the gripper knob 24 and that portion of the hub 22 which bears against the bar offers an equal amount of clearance to the opposite face of the bar and chain. The channel or opening between the outer edge of the disc 23 and the flange 15 allows the escape of chips and sawdust, and yet is sufliciently narrow to prevent injury to a person controlling that end of a chain saw.

The large outside diameter of the guard disc offers additional protection against injury should an attempt be made to remove the auxiliary handle while the saw is still running. Although the handle 17 is the only type illustrated in the drawing, various types of handles such as the looped type or double handles may be used satisfactorily and with equal results.

While one embodiment of the invention has been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to be limited to the precise details de scribed, but is intended to embrace all variations and of said guide bar, an integral flange extending around a 10 portion of the periphery of said base portion, an outwardly projecting handle integral with said flange, a locating pin and a threaded stud both fixed to said boss and extending inwardly therefrom and projecting through said guide bar, and a second member comprising a cent-rally threaded combination hand nut and guard disc receivable on said threaded stud to clamp said guide bar between said boss and combination hand nut and disc, the latter extending over an area substantially coextensive with the base portion of said first member.

References Cited in the file of this patent UNITED STATES PATENTS 1,016,664 Bailey Feb. 6, 1912 2,165,524 Wolf July 11, 1939 2,527,251 Gorden Oct. 24, 1950 2,642,100 Quirks June 16, 1953

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