US1145856A - Wrench for veneer-press screws. - Google Patents

Description

0. BERGSTROIV. WRENCH FOR VENEER PRESS SCREWS. APPLICATION FILED JUNI: I8, |914.

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OSCAR BERGrSTROM, OF CHICAGO, ILLINOIS,` ASSIGNOR TO HANDY MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS.

WRENCH FOR VENEERPRESS SCREWS.

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Speccation of Letters Patent.

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Original application filed November 10, 1913, Serial No. 800,167. `Divided and this application filed June 18,

1914. Serial No. 845,823. v

To all whom it may concern Be it known that I, OSCAR BERGsTRoM, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Wrenches for Veneer- Press Screws; and do hereby declare the following to be a full, clear, and exact description of the invention, such as will en able others skilled in the art to which it ap pertains to make and use the same.

My invention relates to ratchet wrenches and more particularly to wrenches adapted for use with the screws carrying the pressure-feet of veneer presses.

The prime object of my invention is to provide a ratchet Wrench which may be easily and quickly applied to, or detached from the member to be rotated thereby; which will consist of few and easily assembled parts; which will be equipped with suitable stop means for preventing an overstraining of the spring; in which the spring will be held in operative position without the use of screws or other fastening members, and in which the spring may easily be replaced.

Other objects will be apparent from the following specification and from the accompanying drawings, in which- Figure 1 is a plan view of a wrench embodying my invention, the said wrench being shown in engagement with toothed wheels carried by the pressure-foot of a screw as used on veneer presses. Fig. 2 is a fragmentary view of the operative end portion of the wrench, with one arm of the pawl cut away. Fig. 3 is an elevation of the combination shown in Fig. 1 and of a portion of the screw attached to the pres sure-foot and ratchet.

The wrench of my invention is particularly suitable for use in manipulating the pressure screws of veneer presses of the type shown in my copending application, Serial No. 800,167, and is shown in this connection in Figs. 1 and 3 of the drawings. In veneer presses of this type, the pressure is exerted by feet 1, each of which is supported by a vertically disposed screw 2, which screw may be rapidly rotated by manually grasping any one of a plurality of handles 3, which handles are rigid with respect to the screw. Secured to the screwshaft 2 intermediate of the pressure-foot 1 and the said handles 3 are a pair of toothed wheels 4 separated by a collar 5 of considerably smaller diameter y than the toothed portions of the said wheels 4l. To rotate `the said screw-shaft by means of the toothed wheels 4, I provide a wrench comprising a handle 6 equipped with a forked end 7 adapted to straddle or slidingly t the said collar 5.

Secured to the handle 6 by a pivoted pin 8 are the arms9 of a pawl member, which arms are disposed respectively upon opposite sides of the handle of the wrench and are joined to a common head 10 presenting a tip portion adapted to engage the teeth of the wheels 1y after the usual manner of ratchet pawls. The tip 10 of the pawl member preferably corresponds in width approximately to the combined width of the two toothed wheels 4c and the collar 5, the teeth of the said wheels 4: being in alinement so that the said tip of the pawl ,can simultaneously engage the teeth upon each of the said wheels.

The handlemember 6 is equipped near its forked end with a slot disposed at an angle to the axis of the handle 6, the opening of the said slot being directed toward the inner face of the pawl tip 10, which inner face preferably is so shaped as to afford a substantially right-angled formation, one of the face portions constituting the said formation having therein a recessed portion facing the said slot in the handle. Housed .by the said recessed portion of the tip of the pawl member is the forward end 1l of a flat spring having a relatively long shank 12 disposed substantially at right angles to its tip portion 11, the other end of the said shank 12 being housed by the said slot in the handle member.

It will be evident from Fig. 2 that the opening between the two arms or forks 9 of the pawl member will readily permit the forward end of the spring to be inserted in its normal position with respect to the pawl member when the latter is detached from the handle 6 and that the rear end of the spring may readily be slipped into the said slot when the pawl member is being attached to the handle 6 by means of the pivot pin 8, after which the said slot and the said formations upon the tip portion or head of the l to normally 'move the pawl to the position shown in Fig. 2, thereby causing the tip of the pawl to interlock with the adjacent alined teeth of the wheels t as shown in Fig.

c l. However, upon rotating the wrench in Fig. lin a clock-wise direction, the inclined forward surface 13 of the nose of the pawl will ride up the toothed head of the said alined teeth and over the latter, so as to enf gage vthe forward surface of the last-named teeth when the wrench is thereupon moved in the opposite direction.

'Io prevent a possible overstraining of the spring in case of a hasty manipulation of the wrench by an inexperienced user, I preferably equip the handle 6 with stop formations 14: disposed upon opposite sides thereof and respectively adapted vto engage the arms 9 of the pawl member to limit the motion of the said pawl with respect to the handle of the wrench. However, I do not wish to be-limited to this or other details of the construction herein disclosed, as it will be evident that the same might be modified in many ways without departing from the spirit of my invention.

I Vclaim as my invention:

l. -A wrench for a screw equipped with a pair of ratchet wheels rigid with respect to the screw and separated by a shaft, comprising a handle member having a forked end adapted to span the said shaft and equipped near its forkedend with a slot, a bifurcated pawl pivotally mounted on said handle member near the forked end thereof and equipped with a forward end portion extending substantially at right angles to the general direction of the forks of the said pawl, said end portion having a recess facing the pivot of the pawl; and a fiat spring equipped at one end with a substantially right-angled formation housed within the angle formed by the said end portion and forks of the pawl, said recess presenting a shoulder engaging the forward tip of said spring, the other end of said spring housed by the said slot in the handle, whereby the said slot cooperates with said right-angled formation and said recess to retain the spring in operative position. 2. A wrench for a screw equipped with a pair of toothed wheels and a collar therebetween, comprising a handle having a bifurcated end straddling the said collar, the said handle equipped near its bifurcated end with a slot angularly disposed with respect to the axis of the handle; a pawl member including a pair of arms straddling a portion of said handle and jointly pivoted to the latter, and a tip extending substantially at right angles to the said arms and adapted to simultaneously engage teeth upon both of the said wheels, the said tip being substantially in alinement with the said slot and equipped on the side facing the said slot with a recess; and a spring interposed between the handle and pawl, the opposite ends of said spring slidably inserted respectively in said slot and said recess, and a pivotal connection between said handle and pawl, said pivotal connection so disposed with respect to said spring that said slot and recess will coact to maintain the spring in operative position.

In testimony whereof I have signed my name in presence of two subscribing witnesses.

OSCAR BERGSTROM. Witnesses:

HERBERT H. JOSEPH, JOHN S. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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