US1492478A

US1492478A - Quick-action wrench

Info

Publication number: US1492478A
Application number: US572359A
Authority: US
Inventors: Joseph J Markovich
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-07-03
Filing date: 1922-07-03
Publication date: 1924-04-29
Anticipated expiration: 1941-04-29

Description

. April 29, 1924. 1,492,478

J. J. MARKOVICH QUICK ACTION WRENCH Filed July 5 1922 Ilun INVENTOR.

Q ire 17A f/ZJ /(Q V /L ATTORNEY.

T atented Apr. 29, 11924.

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insane JOSEPH J. MARKOVICH, OF UNIONTOVIN, EENNSYLVANIA.

QUICK-ACTION WRENCH.

Application filed July 3,

To all whom it may concern: 7

Be it known that l, JosErr-r J. MARKOVICH, a citizen of the United States, residing at Uniontown, county of Fayette, and State of Pennsylvania, have invented certain new and useful. Improvements in Quick- Action renches, of which the following is a specification.

The present invention relates to improvements in wrenches, and particularly in a wrench as disclosed in my Patent No. 1,1e7,181, dated July 20, 1915. I

In practice I have discovered that a wrench. constructed as disclosed in my above identified patent showed the following disadvantages The operation of the movable jaw was too unhandy with the arrangement disclosed in Figure 1 of my said patent, the

upward movement of the movable jaw was not limited and it happened very frequently in practice that the jaw was withdrawn altogether so that much time was lost in fitting it back into its place, and finally no limit was provided for the lateral displacement of element 25, and no means for automatically guiding the same back into its normal position.

It is the principal object of my invention to overcome all these disadvantages by providing a stop to the upward motion of the movable jaw, by providing a spring for antomatically guiding the guide block for the movable jaw into its original position after each operation and for limiting its lateral displacement.

Another ob 'ect of the invention is the provision of the movable jaw with slanting teeth and of arranging the operating lever for the jaw locking and releasing pawl at a place allowing a most convenient operation of the same.

These and other like objects and advantages of my invention will become more fully apparent as the descri tion thereof proceeds, and will then be specifi-cally'pointed out in the appended claims.

In the accompanying drawing, forming a material part of this disclosure:

Figure 1 is a side view of a wrench constructed according to the present invention. Figure 2 is a front view of the same.

Figure 3 is a fragmentary side view of a modified form of my wrench.

Figure 4 is a top plan view and longitudinal section of the stationary jaw showing 1922.- Serial No. 572,359.

the same provided with teeth at its ping face, and I Figure 5 shows similar views with the jaw provided with a corrugated gripping face.

The wrench comprises the customary stationary jaw integrally made with a shaft or handle 11, and a movable jaw 12 with a shaft 13. The mova b lejaw 12. is formed with an exchangeable gripping element 141 secured to the jaw 12 by means of a screw 15 and is providedat its lower face with teeth 16.

The rear edge of the shaft 13 for the movable jaw is provided with slanting teeth 17 adapted to be engaged by the teeth of a member 18 secured at its upper end, as at 19, to the inner wall of. a casing 20 through whichthe shaft 13 is guidechand which is pivotally secured near its inner upper end as at 21 to the shaft 11. A pawl 22 is pivotally secured intermediate its ends, as at 23 to the inner wall of housing 20, and its upper end engages a shoulder 2 1 at the lower end of member 18 while its lowenend projects out of casing 20. A leaf spring 25 secured with its upper end as at 26, to casing 20 enters the casing 20, and presses with its lower end against the rear edge of member 18 to normally hold the teeth of the same in engagement with the teeth of shaft 13. The lower end of the shaft 13 is provided at its inner edge with a stop screw 27 adapted to engage a stop pin 28 connecting the side walls of casing 20 and to limit the upward movement of jaw 12.

The housing 20 has an extension 29 at its lower inner end through which the shaft 11 of the stationary jaw extends, and a leaf spring 30 is secured with its lower end as at 31 to the front edge of shaft 11, while its upper, curved end extends into the housing and engages the inner wall of extension 29,

as indicated at 32.

The stationary jaw 10 is formed as illustrated in Figures 1 and 5 by an element 33 provided at its upper gripping face with teeth 34 or corrugations 35, and this element is secured by means of a screw 36 passed through a hole 37 in the end face of the element into the jaw 10, The front end of element 35 is provided with checks 38 permitting the passage of and guiding the shaft 13 of the movable jaw.

In Figure 3 a modified form of my invention is illustrated showing a movable jaw 39, the shank 40 of which is provided with teeth 41 and 42 on both of its opposite edges, while the shank is guided through a housing 43, pivotally secured near its upper edge as at 44, to the shank 45 of the stationary jaw 46. The housing 43 has a transverse opening 47, and a projecting nose 48. In opening 47 a knurled. nut 49 is carried in the usual manner by shank 40 of the movable jaw 39 to vertically displace the same. A leaf spring 50 is secured with its lower end to shaft 45 and its upper curved end enters the nose 48 and engages the inner wall thereof as indicated at 51.

The wrench is operated in the following manner:

If it is desired to clamp an object between the movable and stationary jaws, the operator presses pawl 22 and spring 30 between the thumb and index finger together which will allow a free movement of shaft 13 to adjust the jaws 12 and 10 to grip the object. After releasing pawl 22 and spring 30 the jaws will grip over the object between them and an operation of handle 11 will tend to tighten the grip of the jaws, under the lateral displacement of casing 20 and shank 13, while spring will return the parts automatically into their normal positions when the jaws are released from the object.

The engagement between stop 27 and pin 28 will limit the upward movement of the movable jaw so it cannot become accidentally detached from the wrench.

Having thus described my invention, what I claim is A wrench including a fixed jaw, a shank therefor, a movable jaw, a shank therefor, a hollow casing pivotally connected to the shank of the fixed jaw with its respective side walls normally in spaced relation to the shanks of the fixed and movable jaws, a spring intermediate the shank of the fixed j aw and the adjacent side walls of the casing to hold the casing in normal position, a looking member mounted in the casing between the shank of the movable jaw and the adjacent side wall of the casing, cooperating teeth on the locking member and movable jaw shank, means for operating the locking member, a pin arranged transverse the casing between the respective shanks, and a projection on the lower end of the shank of the movable aw to engage said pin and limit the opening movement of said movable jaw.

In testimony whereof I have aflixed my signature.

JOSEPH J. MARKOVICH.