US1004465A - Jack. - Google Patents

Description

N. PREZEAU. JACK.

APPLICATION FILED IEB.21,1911'\ Patented Sept. 26, 1911.

JR Q

. description and accompanying drawings, in

UNITED sratrns PATENT OFFICE.

INAPOLEON PBEZEAU, BAKER, OREGON.

JACK.

Specification of Letters Patent. Patented Sept. 26, 1911. Application filed February 21, 1911.

Serial No. 610,036.

To all whom it may concern:

Be it known that I, NAPOLEON PREZEAU, citizen of the'United States, residing at Bakercity, the county of Baker and State of Oregon have invented certain new and useful Improvements in Jacks, of which the following ,is a specification.

This invention relates to an improved jack, and refers particularly to a machine formoving heavy objects, such as buildings, pulling stumps, or stretching wire.

The invention has for an object to provide a jack of this nature with a double pawl mechanism for feeding the draw bar through the casing ofthe jack by each movement of the lever.

The invention has for another object to so connect and mount the operating lever as to increase, considerably, the lcvera e upon the operating pawls so that heavy o jects'may be moved by the jack withthe application of comparatively little power.

The invention still further comprehends a jack which is provided with a simple relleasing means for freeing the draw bar so that the same can be extended for the purpose of acquiring a new grip upon the object being drawn.

For a full understanding of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction, reference is to be had to the following which:

Figure'l is a perspective view of the completejack; Fig. 2 is a longitudinal central section taken vertically through the jack; and, Fig. 3 is an inner end view of the jack.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawing by the same reference characters.

Referring to the drawing the reference numerals 10 and 11 designate a pair of side plates which are joined at their lower edges by a spacin bar 12. Thespacing bar 12 'is formedo a relatively thick angular bar which projects beyond the inner ends of the plates 10 and 11 and is curved down to form an attaching hook 13. The bar 12 extends the entire length of the plates 10 and 11 and forms in conpmction therewith a vcasing or housing for the improved mechanism.

.of the draw bar 14 is provided with a strap 17 lapping about the end of the draw bar and hingedly carrying a link 18 to which is attached the object to be moved. The outer end of the casing is provided with a pair of spaced upstanding arms 19 project-' ing considerably above the edges of the plates 10'and 11. The arms 19 are disposed in registration with one another and hingedly support 11 on a bolt 20 the lower end of the ban lever 21. 'The hand lever 21 is provided upon its lower extrem ity with an edgewise oflset web 22 of circular form and which is of a width equal to only one half of the thickness of the lever. The web 22 has its outer face in the plane of one side of the lever while its inner face is continued beyond the perimeter of the web to form an interlocking fian e 23. The

with an abrupt shoulder 24 fo'rmed'at the inner edge of the-web 22. The lever 21 is connected to a link 25 which is rovided with an offset web 26 having a tlhnge 27 adapted to register with and engage against the flange 23 of the web 22. The link25 is likewise provided upon its extremity with an abrupt shoulder 28.. which is formed at the inner edge of the web 26. The lever 21 and the link 25 are each provided with undercut arcuate grooves 29 and 30 to receive the flanges 27 and 23 respectively. The undercut grooves 29 and 30 serve to hold the flanges 23 and 27 against one another and offset the lateral movement of the link 25. A rivet 31 passes loosely through the webs 22 and 26 to pi'votally connect the lever and the link.

The outerend of the link 25 is provided 100 with an outwardly extending circular ear 32 which is apertured and adapted for engagement within the fork 33 formed rigidly upon the upper end of the rocker arm 34=.

The rocker arm 34 depends from the link 25. .105 and is hinged upon the bolt 35 at its lower lower extremity of the lever 21 is provided end, the bolt being'oarried through a pair of short arms 36 carriedagainst the opposite sides of the casing.

A short pawl 37 is hinged upon the lower extremity of the rocker arm 34 and extends inwardly and down therefrom to engage with the teeth of the draw bar 14. A long pawl 38 is pivoted upon the rocker arm 34 at a point above the bolt 35 and eX- "tends inwardly and down over the short pawl37 to engage with the teeth 15 of the employed in normally holding the tension arm 41 down. The inturned finger 4O rests against the upper edge of the short pawl 37 and forces the same down upon the teeth 15.

A leaf spring 44 is carried between the plates 10'and 11 above the inner block 16 and is hinged upon a transverse bolt 45. Theouter end of the leaf spring 44 is provided with an uptui'ned lip for the reception of the finger of the operator when it is desiredto swing the spring44 over out of operat ion. The spring 44 normally rests upon the upper edge of the long pawl 38 to hold the same down upon the teeth 15. A detachable pin 46 is engaged through the plates.

10 and 11 and across the upper face of the s ring 44 outwardly ofwthe transverse bolt- 4? to hold the spring down against the pawl 38. The pin 46 is adapted to be detached from the plates when it is desiredto release the-spring from the pawl.

The operation of the device is apparent since when the lever 22 is vibrated'the link- 25 is moved back and, forth to reciprocate the rocker arm 34.- The outward movement of the uppenend ofthe rocker arm 34 moves the lower or short pawl 37 inward against theadjacent tooth 15, effecting the drawing in or movement'bf the draw bar 14 through the casing. As the. rocker arm 34 is moved in the opposite 'direction the pawl 37 is retracted to registertwith the next outer tooth of the draw bar while at the same time the upper or long pawl 38 is moved inward against its adjacent tooth 15 to further carry In this manner the rocker arm 34 alternately reoiproca res the pawls 37 and 38 to effect the continuous feeding of. the draw bar 14 through the casing. Thetension arm 41 re-v tains the short pawl 37 against the teeth 15 while the spring 44 holds the long pa W1 34 thc'draw bar 14 through the casing.'

against the teeth of the rack bar. \Vhen it is desired to release the draw bar so that the same can be extended, the pin 46 is withdrawnfrom the casing and the spring 44 is raised or swung out of engagement with the long pawl 38.

The peculiar form of the webs 22 and 26 hold the link 25 from swaying laterally and thus reduce the frictional contact between the pivoted parts and prevents the binding of the same. The shoulders 24 and 28 formed upon thehand lever and the link 25 are adapted to contact whenthe lever is moved into parallelism with the-draw bar 14 so as to limit the swinging movement of the lever.

Having thus described the invention, what is claimed is:

1. A jack comprising a casing having spaced side plates a' draw bar slidable through the casing and having upstanding teeth, a rocker arm hinged adjacent to its' lower end between the. sidebars above the rack bar, pawls hinged upon the rocker arm at the opposite sides of the pivotal support thereof, a tension arm hinged upon'one of the side plates and having-an inwardly extending finger projecting through the side plate and resting upon the upper side of the lower pawl, and a leaf spring disposed between the side plates and engaging at its free end upon the upper edge of the upper pawl. I

2. A jack comprising a casing having side plates, a draw bar slidable through the casing and having rack teeth, a rocker arm hinged between the side plates, upper and lower pawls hinged upon the rocker arm at the opposite sides of its pivotal support, op-

erating means for rocking the arm, a tension armhinged against one of the side plates and having an inturned finger pro ectlng therethrough and engaging with the lower pawl, a retractile spring carried by the side plate and engaging with the tension arm to draw the latter down, and a leaf spring carried between the side plates and engaging with the upper pawl to press the' same against the rack teeth.

3. A ack comprislng a casing having spaced slde plates, a rocker arm lunged between the side plates, pawls hinge'dnpon the rocker arm, a draw bar slidable through the casing and having rack teeth cooperating-with the pawl's, a spring arm hinged against one of the side plates and extending theretl1rough for engagement with the lower pawl, a leaf spring hinged between the side plates and bearing against the upper pawl to normally hold the same against the rack teeth, and a detachable pin engaging through the side plates and against the spring to normally depress the same against the upper pawl, said pin being adapted to be removed whereby the spring is swung up from engagement with the pawl to release the same from the rack.

4. A jack comprising a casing, a draw bar slid'ahle through the casing and having teeth in its upper edge, a rocker arm hinged in the casing, pawls carried 'upon the rocker arm for alternate engagement with the teeth of the rack bar, a spring operated arm carried against the side of the casing and having an inwardly extending finger engaging with the lower pawl, a leaf spring hinged in yieldingly hold the same down against the upper pawl.

In testimony whereof, I afiix my signature in presence of two witnesses.

NAPOLEON PREZEAU. [L. s.]

Witnesses L. ULLMAN, J. N. HART.

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