US1091156A - Saw-guard. - Google Patents

Description

L. N. NELSON.

SAW GUARD.

APPLICATION FILED AUG.1B,1912.

LQL 56. Patented Mar. 24, 19m

. UNITED 1steil-#gasPAmir cruce.

LAUnENcE tnnnsolv, or STURGEONBAY, WISCONSIN.

SAW-Grimm.

Specification of Letters Patent. `v Pgrggned iwan 24, 1914.

Applicat'ibn led. August 16, 1912, `Serial No. 715,500.

To all Qtr/0m itmay/ concern.' f i Be it known that I, LAURENCE N. NEL` son. a citizen of the United States, residing at Sturgeon Bay, in the county of Door,

State of I'Visconsin, have invente-d certain-v new and useful Improvements Ain Saw- Guards; and I do hereby declarethe=fol lowing. to be a full, clear, and exact description of the invention, such as will enable others skilled in the art. to which it appertains to make and use the same.

This invention relates to guards for rotary saws and has for an object to provide a guard that will be adjustable so as to permit of various sizes of timbers entcrin the guard to be operated upon by the saw.

A further object ofthe invention is to provide means for easily andl quickly adjusting,r the guard to operative position.

lith the above objects in iiew the invention consists of certain novel details of construction and combination of parts here#` matter fully described andclanned. it be` ing understood that. various modiications w may be made in the minor details of construction within the scope of the appended claim.

In the accompanying drawings'forming part of this specification z-Figure l is a side elevation of the device applied. Fig. 2"` is a front elevation of the parts shown in Ytig. l. Fig. S-is a cross sectional view taken nrough the parts of the guard shown in Fig. 1. Fig. 4 is a longitudinal seetional View through the parts shown in Figi." 2..

referring now to the drawings in which like cha 'acters of reference designate similar parts, l0 designates the spaced longitudinal bed sills of the saw, upon which a carvricr ll. slidably supports the timber to be operated upon, the rotary saw l2 being mounted upon a shaft. 13 which is journaled for rotation in bearings 14 fixed to the bed sills. These parts are of ordinary construction and form no part of the present inrention.

The saw guard is supported by a vertically disposed sheet metal standard 15 -which is equipped with parallel vertical slots '16. A bed plate 1S is bolted or otherwise secured to one of the bed sills 10 and is equipped on the top face with' angleirons 19 to which the lower edge ofthe standard vis riveted as shown at 20 or otherwise secured. The top edge -of the standard is bentover toward the saw to hook 21;

The guard hood comprises a pair of loweri angleiron bars 22, which are of suffi-l cient length-to extend from the rear edgel 60 of the vstandzird 'forwardly beyond the stand-l ardand` overthesaw, there` being a pair"t of upper angleiron bars 23 arranged in the vertical plane of the lower bars and extend+ ing parallel therewith for a distance equal G5 to the width of the standard, thence being bowed downwardly, at their forward ends as shown at 24# and terminally secured to the forward ends of the lower bars. Both lower bars are connected terminally and 7o also intermediate the ends by cross bars 25, and both upper bars are connected terminally and intermediate the ends by cross bars 26. A sheet metal bac-k plate 27 is riveted or otherwise secured to the upper and lower bars next adjacent to the standard, and guide ylugs 2S are arra-nged'in vertical alinement in the backplate and extend through the guide slots -16 of the standard. y, I'

A wire mesh screen 29 is stretched over provide a stopl lthe skeleton frame above described and be moved vertically upon the standard through the instrumentality of the guide pin and slotl connection between the standard and hood, and for'thus actuating the hood the following mechanism is employed. The back plate is provided on the lower edge with an inwardly projecting lip 30 which is equipped with an internally threaded bearing 3l. 'A smooth bore bearing 32 is arranged on the bed plate in vertical alinement with the bearing 31. jin upstanding feed screw 33 is journaled for rotation in the bearing and threads through the bearing Si, actuation of this stand shaft. serving to advance or retractthe beari ng 3l longitudinally of the feed screw with a`resultant raising or lowering of the hood. A. manually operat-able crank shaft 34 is journaled in suitable bearings 35 carried by one of 105 the bed sills 10 and is equipped with a bevel gear 3G which meshes with@ bevelv gear 37 fixed on the lower end oftthekfeed screw. Upon actuation `of Ithe cranlpslmftfv4 the. feed [screw will berotated to raise orf/lower the `1l0 hood: The hood is braced against vibrationl and having the top edge bent toward said by means of an inclined brace rod 37 se? l saw to produce, a stop ange, n hood over cured to the plate 31 and to a cross bar 37" secured to the bed sills l0. 4

The'stop hook 2l of the standard contaots vvfth the adjacent Oper bar 23 of the hood frame and limits raising movement of "the frame, suchcontam'.L taking place prior to the advance of the guide lugs to the upper ends of the guide slots, thus obv'iating sheering off of the uide lugs by contact .With-'the end .Walls of t e slots.i e",

The combination With a circular saw and 1 'its support, of: a saw guard including a sheetnetal plate secured to said support upon 'one side thereof parallel to said saw,

said saw slidably mounted on said plate and adapted to engae with said flange whereby the movementA o said hood away from said saw is limited, means on said plate engageable by Said hood and serving to' limit movement of said hood toward said sow, und

Ameans for moving said hoodttoward and away fromsaid saw. In testimony whereof, I aix my signature, in presence of two wltnesses.

'LAURENCE N. NELSON.

' Vitnesses yEUGENE SMo1v,' 4 H. ML 'KNUDSON l

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