US1631689A - Wrench for screw-top jars - Google Patents

Description

June 7 1927.-

F. MOSER WRENCH FORSCREW TOP JARS Filed April '7. 1926 Z Z g'M INVENTOR Patented June 7, i927.

PATENT OFFICE.

FELIX MOSER. OF HOLLAND, MICHIGAN.

WRENCH FOR SCREW-TOP JARS.

Application filed April 7, 1926. Serial No. 100,337.

The invention relates to a new form of wrenchfor screw-top jars. and it consists of a strap and a handle. as shown in the accompanying drawing. The object of the in vention is to produce a wrench for screw'top jars that will open them with ease and close them tightly without injuring the cover.

Fig. 1 shows the wrench as applied to the jar cover in the act of closing it. It explains the direction of forces and the mechanical advantages.

Fig. 2 is a perspective view of the wrench loosely applied f01'.0p6l'lll1g the jar.

The wrench consists of 'a looped strap 1 of leather or similar material, both ends of which are fastened to the same edge 6 of a handle 2 by screws 3 or some other means.

The strap 1 is of such size that it will just lit the jar cover 4. The screws 3 are set back toincrease the size of the loop so that it may be slipped on with ease. The handle 2 I on the cover on applying force. as indicated which may be about the thickness of the height of the jar cover and of convenient length and breadth, has a pointed 'or bev eled end 5, this making one edge longer than the other. The strap 1 is attached to the longer edge 6, and on account of the pointed or beveled endof about 60 of the handle 1, is enabled to embrace about nine-tenths of the circumference of the cover 4, thus securing a maximum of friction and therefore .trated is intended to be a fruit-jar wrench,

taking a firm grip.

Mechanically the wrench has seven distinct movements or mechanical advantages as pointed out in Fig. 1. They are:

A. The lever from the center of the cover to the end of the handle, a force which is common to all wrenches.

B. A circular movement of the handle, pivoting on nearest screw 3.

C. Strap following that movement tightening around the cover.

D. The tightening of the strap around the cover in the opposite direction;

E. The leverage exerted on the strap holding that end of the strap against the cover. F. The amount of friction (the. grip established by the loop of the strap around the circumference of the cover.

G. The leverage exerted tightening the strap around the cover, which is not less than sixteen to one, after the force is applied and the point of the handle forces the strap parts to meet at g. v

For closing: the jar the wrench is a plied as is shown in Fig. 1, force being ap ied as indicated by arrow a. This causes the handle to move slightly in the direction of arrow, 7). exerting a leverage of about four to one, the nearest screw 3 being the fulcrum. The same force will tighten the strap following arrow c, and also inthe oppos1te direction following" arrow (1; The handle now pivoting on the center of the circle e exerts f a leverage of sixteen to one against the cover.

holding down that end of the strap. By this time the point of'the handle 'will cause the strap to shorten its loop' at g, tightening the strap around the cover with a leverage not less than sixteen to one.

Thus it can readily be seen that the grip by the arrows a becomes simultaneously absolutely locked; and as the point of the handle causes the strap to embrace nine-' tenthsof the circumference of the cover, a

nonslip gripis established. p

' The cover can thus be tightly closed with comparative ease. For opening the operation is reversed as indicated in Fig. 2.

While the wrench as described'and illusit is to be understood that such a wrench may be used for other purposes and various "changes in shape may be made without deabout sixty degrees adjacent the longer side,

and having a loop orstrap of flexible ma-' terial secured at both its ends to the said longer side of the handle, the said tapered end being adapted to press into the bightof the loop and draw it closely around the jar top thus enabling the strap to gri about nine-tenths of the object to be turn rnnmmosnn.

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