US904988A - Sawhorse. - Google Patents

Description

0. POITRAS.

sAwHoRsE.

Patented Nov. 24, 1908;

APPLICATIONIILBD JAN. 9, 1908.

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wuw/bo/c 0. Poi frqs OSIAS POITRAS, OF FllUHl-URG, MASSACHUSllTS.

SAV/HORSE.

Specification of Letters Patent.

Patented NovY 24, 1908.

Application filed January 9, 1908. Serial No. 409,993.

To all 107mm "it may concern:

Ie it known that I, @sus Porrnas, a subject of King Edward VII of England, residing at l `itchlnn'g, in the county of 7orcester and State ot Massachusetts. have invented certain new and useful Improvements in Sawhorses; and I do declare the following 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 improvements in saw horses.

rlhe object of the invention is to provide a saw horse having means for firmly holding a log in place while being sawed.

A t'urther object is to provide a holding device b v means of which both the ends of a log will be lirmly held, even though one end is considerably larger than the other.

With these and other objects in view, the invention consists otl certain novel features ot' construction, combination and arrangement ot parte as will be described hereinafter and particularly pointed out in the appended claims.

In the accompanying drawings, Figure l is a top plan view of a saw horse; F ig. 2 is a vertical longitudinal sectional view showing in full lines the position of the log holding device when holding the smaller end o't the log; and in dotted lines the inoperative position of the log holding device; Fig. 3 is a similar view looking toward the opposite side ot' the horse and showing the holder in position tor holding the larger end of the log, parts being in section to show the yielding connection between the treadle connecting rod and the log holding devices; and F ig. is a detail sectional view through the treadle connecting rod and the end ot' the log holding device.

In the embodiment of my invention I pro- Vide a saw horse of the usual construction` comprising side pieces, l formed of crossed bars, 2 and 3, which are connected together at their point ot' crossing by a tiansverselj7 disposed bar, e, on which is preferably arranged the usual loose sleeve, 5. The bars, 2, are connected together at their lower ends by a cross bar, 6, the ends of which are pivotally mounted in the ends of the cross bars, as shown. The lower ends of the bars, 3, are connected together by a cross bar, 7. On the inner sides of the upper portion of the bars,

2, are secured toothed bars, S, the teeth ot which project downwardly as shown.

Iivotally mounted on the bar 4lare lofr clamping devices which are here shown and are preferably in the 'torni of right-angularly shaped bars. il. one arm oit which is pivotally mounted on the cross bar, -t, between the sleeve. 5, and the adjacent side ol" the horse, while the other arm, l0. ot the barsI is provided with a toothed bar, l?. the teith of which incline downwardly, as shown.

Secured to the pivotally mounted cross bar, (S, is a trezu'lle` 1?), which preferably conot a flat board, or plate, the width o't which is substantially the same as the distance between the sides ot the horse. 'l`o the underside oit the forward end o't the treadle is secured a bar, l-t, on the ends ot which are formed trunnions` l5, on which are pivotally mounted the lower ends of operating rods, 1G, b v means ot which the treadle is operatively connected with the Ytorward ends o'lI the pivoted arms oit' the log clamping devices. The upper ends ot the rods` lo. are preterably slotted, as at l?, by means ot which said ends are loosely connected to stud bolts t8, secured to the ends of the arms of the log clamping bars, as shown.

In the upper portions oi the rods 1G are formed recesses, 19, in which are arranged coiled springs, 20, one end ot which is secured to a cross pin in the lower end oit the recesses, 19, while the upper ends ot' the springs are connected to the stud bolts, 18, by means of clips, 2l, or similar connecting devices. By means of the slots, 17, and the springs, 20, the operating rods 1G are yieldingly connected to the outer ends of the pivoted arms of the log holding devices, whereby when the treadle is depressed, said log clamping devices will be thrown t'orwardly into yielding engagement with the log, said yielding connections providing means whereby the log holding devices will firmly hold the log at each end irrespective of the size of the same so that when a log is placed on the horse for sawing, one end will be held as firmly as the other.

Connected to the treadle adjacent to one edge of the same is a coiled retracting spring, 22, the upper end of which is connected to the adjacent side oi thc horse, whereby when pressure is released trom the treadle, said spring will raise the saine and the operating rods connected thereto, and cause the latter lOl) to disengage the log holding devices from the log to permit the latter to be removed y from the horse. On the inner sides of the cross bars, 2 and 8, forming the sides of the horse, are inwardly projecting stop pins, 23, which are adapted to be engaged by the log holding devices to limit the movement of the same in either direction. On the treadle, adjacent to the pivoted end of the same. is arranged a transversely disposed cleat, 2l, which is adapted to be engaged by the heel of the operator, and to thus prevent the foot slipping oft' the treadle.

Then a log which is smaller at one end than at the other is placed on the horse for sawing, the treadle is depressed and the log holding device at the side of the horse in which the larger end of the log rests, is brought into engagement with the log, after which a further pressure on the treadle will draw the opposite holding device into engagement with the smaller end of the log. thus firmly gripping both ends.

The unequal operation of the two log holding devices is permitted through the loose spring connection between the upper ends of the operating rods, 1G, with said devices as hereinbefore described.

Having thus described my invention, what I claim as new, and desire to secure by Letters-Patent, is:

l. In a saw horse, a pair of pivotally mounted log clamping devices, said devices comprising right-angularly formed bars, one of which is pivotally engaged with the central cross bar of t-he horse, a treadle pivotece-e se ally mounted in the lower' end of the horse, operating rods pivotally connected at their lower ends to the forward end of said treadle, said rods having slotted upper ends adapted to be loosely connected to the pivoted arms of said log holding devices, springs secured at one end to said operating rods and at their opposite ends to the pivoted arms of said log holding devices, whereby l a yielding connection is provided between said rods and the holding devices, and a retracting spring connected to said treadle to lift the same after pressure has been removed therefrom, substantially as described.

2. In a saw horse, a pair of toothed log grippingbars, a pair of log-holding devices comprising pivoted supporting arms, and right-angularly disposed log engaging arms, toothed log gripping bars secured to said log engaging arms, a treadle pivotally mounted in the lower portion of said horse, operating rods pivotally connected at their lower ends to the free end of said treadle, a loose yielding connection between the upper ends of said rods and pivoted arms of said log holding devices, a treadle ret-racting spring, and stop pins arranged on the inner sides of the horse to limit the movement of the log holding devices, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

OSIAS POTRAS. lllitnesses LEoDA GUENETTE, LOUIS O. L. Esrmmxon.

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