Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1090578 A
Publication typeGrant
Publication dateMar 17, 1914
Filing dateJun 10, 1911
Priority dateJun 10, 1911
Publication numberUS 1090578 A, US 1090578A, US-A-1090578, US1090578 A, US1090578A
InventorsJoseph B Smythe
Original AssigneeJoseph B Smythe
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ratchet mechanism.
US 1090578 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

JOSEPH B. SMYTHE, OF COATICOOK, QUEBEC, CANADA.

RATCHET MECHANISM.

Specification of Letters Patent.

Patented Mar. 17!, 1914.

\ Application filed June 10, 1911. Serial No. 632,5J 0.

and useful Improvements in Ratchet Mech-- anism, of which the following is a specification.

This invention relates to ratchet mechanism, pawls and ratchets, particularly adapted. for use with lifting jacks, andparticularly to that class of jacks which are known as ratchet screw jacks, and which are manipulated by an operating handle carrying a double ended pawl, either end of which is adapted to engage with the ratchet wheel on an operating shaft. v

The object of thepresent invention is to provide an increased working surface between the pawl and the ratchet wheel, thereby obviating the danger of splitting the ratchets when in operation, and make it possible to operate the ratchet mechanism with a decreased movement of the operatinglever.

The invention consists in'providing theoperating lever with a socket having a trans verse slot in which is positioned the ratchet wheel secured to the shaft of the operating gear, and interposing between said ratchet wheel and. one wall of the socket a recipro- I eating pawl having'a set of teeth at each end' thereof, either of which is adapted to be brought into position to coact with the ratchet teeth to efle'ctthe raising or lowering of the jack as desired.

The invention further consists in certain novel features of construction and arrangement of parts which will be thoroughly understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings:-Figure 1 represents a vertical section of a jack embodying the fea tures of the present invention. Fig. 2 rep resents a section of the gear operating mech- ,anism, the cutting plane being on line 22 on Figs. 1 and 3. Fig. 3 represents a vertical sectionofthe same, the cutting plane being on line 33 on Fig. 2, and Fig. 4 repre-v sents a transverse vertical section of the same, the cutting plane being on line 44 on Fig. 2.

Similar characters designate like parts throughout the several figures of the draw- 'ings.

In the drawings, 10 represents a suitable base supporting the stationary standard 11 over the outer periphery of which is fitted a movable sleeve 12,. to the upper end of which 1s threaded a head 13. In the upper end of the head 13 is mounted a plate 14, between the underface of which and the upper face of a beveled gear 15 is interposed a plurality of anti-friction members 16. The gear 15 is splined to the reduced upper end of a screw 17, the threaded end of which is threaded to a nut 18 mounted in the upper end of the standard 11. The gear 15'meshes with the gear 19 secured to or formed upon a revoluble shaft 20 mounted in a bearing 22 on the side of the movable member 12. To the reduced end of the revoluble shaft 20 is splined or otherwise secured the ratchet wheel 23, positioned within a slot 24 of a socket mem ber 25. This socket member 25 when in use has inserted'therein a handle 26 as indicated in dotted lines in Fig. 2 of the drawings, which handle may be moved by the operator to cause an oscillation of the socket member 25 about the shaft 20 upon which it is free to move in either direction, said socket member being retained in position upon said shaft 20 by means of a cotter pin or similar member 27. The ratchet wheel 23 is provided throughout its periphery with a plurality of V-shaped teeth 28. Interposed between this ratchet wheel 23 and one end face 29 of the slot 24 is a reciprocating wedge member 30.

One face of the member 30 is fiat and bears against the fiat face 29 of the slot 24, while the opposite face is provided at either end with a plurality of V-shaped teeth 31. Between these sets of teeth 31 is a connecting portion 32 having a short fiat face 33 parallel to the back face of the member 30, and normally in contact with the ends of the teeth 28. Each set of teeth 31 is arranged in the arc of a circle, the radius of which is the same as that of the ratchet wheel 23, so that when either set of teeth 31 are in engagement with the ratchet teeth 28, all said teeth accurately fit one another and the working surface is thereby greatly increased over a ratchet mechanism such as has usually been used, in which a single pawl coacts with the ratchet teeth. This construction insures a i better grip for operating the jack and owing to the increased gripping surface there is no splitting strain on t e mechanism, as when the pawl is in action it wedges itself between the ratchet wheel and the wall 29 of I the arrow-thereon, the ratchet teeth 31 will multiplication, of power,

the wall of easilyto 1permit the teeth topasson the reso coact with the ratchet teeth 28 as to cause the member 30 to become wedged between the ratchet wheel 23 and the wall 29 and insure a rotary movement of the shaft 20, while permitting, in the return movement of the socket 25, the teeth 31 to pass over the teeth 28, preparatory to securing another grip thereon. This slight movement of the member 30 to permit its teeth to pass the teeth of the ratchet wheel during the return movement is effected by means of the notch 34 cut in the side face of the pawl member 30, and coacting with the V-shaped end of-a locking member 35 positioned in a recess in the socket member 25 and pressed inwardly into contact with one wall of the notch 34: by

means of the spring 36. During the return movement of the socket the locking member 35 will be retracted slightly against the ten. sion of the spring 36 to permit the teeth of the two members to pass one another. The locking member 35 is prevented from turning in'its recess and from beingaccidentally displaced therefrom by means of the screw 37. When it is desired to lower the jack, the member 30 is pressed through the slot in the socket 25 until the notch 38 engages the locking member 35, thereby bringing the other set of teeth 31 into action. It is obvious that during the raising and lowering of the handle 26 the reciprocating pawl member 30 will automatically engage and disengage the ratchet either when'lowering or raising the jack. In order to reduce the frictional contact between the member 30 and the-wall 29 as it reciprocates in the slot in the socket 25, portions of the rear face of said member are cut away as indicated at 38, this also serving to reduce the weight of the pawl member.

In the ordinary ratchet mechanism where a single ploint on the pawl is used for liftin' and'anot er single po nt on the pawl is use for lowering, there is always a great danger of splitting the ratchets owing to the great while in the present construction,- with the increased -area of the grippin surface, this danger is wholly overcome. 7 ile the action 0 the device is very powerful, owing to the pawl when in opera-. tion wedging itself between the ratchet and the slot, the pawl releases very turn stro -Another advantage is-that the back lash in the present construction is greatly reduced over that of the ordinary pawl-and rathet in general use. ,Moreo'ver,

owing to the increased number of teeth in the pawl in engagement with the ratchet, the

lever may be worked in a much smaller space than in the ratchet mechanisms generally used.

It is believed that the operation and many advantages of the invention will be thoroughly understood from the foregoing. Having thus described my. invention, I

claim:

1. In a device of the class described, thecombination of a spindle, an oscillating lever on) said spindle-provided with a socket havin" a transverse slot therein one wall of which is straight and unobstructed; a wheel within said slot secured to said spindle and provided with a serrated peripheral surface; a slidable wedge member in. said slot restricted'in its movement to a path tangen- .tial to said wheel by a flat face contacting with said straight wall'and provided on its opposite face with a curved serrated surface coacting with the periphery of said wheel; and means providing a limited sliding movement of said wedge member during each oscillation of said lever.

' 2. In a device of the class described, the combination of a spindle, an oscillating lever on said spindle provided with a socket having a transverse slot therein one wall of which is straight and unobstructed; a wheel within said slot secured to said spindle and provided with a serrated peripheral surface; a slidable double-ended wedge member in said slot having a flat face contacting with said straight wall and thereby restricted in its movement to a path tangential to said wheeland provided'on its opposite face with a curved serrated surface at each end either of which is adapted to coact with the periphery of said wheel; and means providing a limited sliding movement of said wedge member during each oscillation of said lever. p

3. In a device of the class described, the combination of a spindle; an oscillating lever on said spindle provided with a socket having a transverse slot therein having parallel unobstructed end walls; a wheel within'said slot secured to said spindle and provided with a serrated peripheral surace; a slidable double-ended wedge member in said slot having a flat base contactin with the outer end wall of said slot an thereby restricted in its movement. to a path tangential to said wheel and provided on its opposite face with a curved serrated surface at each end either of which is adapted to coact with the periphery of said wheel, said curved-serrated surfaces being connected by a flat face contacting with the periphery of said wheel; and means providin a limited sliding movement of said wedge member during each oscillation of said lever.

having a transverse slottherein; a wheel within said slot secured to said spindle and provided with a serrated peripheral surface; a slidable double-ended wedge memher in said slot restricted in its movement to a path tangential to said wheel and provided with a curved serrated surface at each end either of which is adapted to coact with the periphery of said wheel, said member being provided with two notches intermediate its ends; and means cooperating with eitherof' saidnotches to retain said member in position for one selected curved serrated surface to coact with said wheel while permitting a limited reciprocation to said member dur- .ing each oscillation of said lever.

5. In a device of the class described, the combination of a spindle; an oscillating lever'on said spindle provided with a socket with a transverse slot therein; a ratchet wheel within said slot secured to said spindle and provided with V-teeth; a slidable member in said slot provided with two sets of; V-teeth adapted to coact independently with i said ratchet teeth and having two notches therein; and a spring-pressed member having an end adapted to engage either notch which end is of less width than that of the coacting notch.

6. In a device of the class described, the

combination of a spindle; an oscillating leveron said spindle provided with a socket with a transverse slot therein having parallel unobstructed end walls; a wheel within said slotsecured to said spindle provided with a serrated peripheral surface; a slidable double ended wedge member in said slot normally having a limited movement in a straight path with its base contacting with the outer end wall of said slot and provided at each end of its opposite face with a curved serrated surface, said curved surfaces being curved serrated surfaces adapted to coact independently with said wheel periphery and having two notches therein; and a spring pressed member having an end adapted to engage either notch which end is of less width than that of the coacting notch.

8. In a device of the class described, the combination of a spindle; an oscillating lever on said spindle provided with a socket with a transverse slot therein; a wheel within said slot secured to said spindle provided with a serrated peripheral surface; a slidable member in said slot provided with two curved serrated surfaces adapted to coact independently with said Wheel periphery and having two notches therein; a spring pressed member having a tapered end adapted to engage either notch; and a stop preventing the tapered end ofsa1d spr ng pressed member extending to the bottom of said notches thereby permitting a limited movement to said slidable member.

Signed by me at 4 Post Office Sq., Boston,

Mass, this 19th day of May, 1911.

JOSEPH SMYTHE.

Witnesses:

WALTER E. LoMBARD, NATHAN O. LOMBARD.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2430480 *Feb 26, 1944Nov 11, 1947Honore C HubbardRatchet wrench
US2712467 *Jul 31, 1950Jul 5, 1955 Manually operable hole digger
US2850129 *Jul 26, 1952Sep 2, 1958I L HartenbergClutch for a brace
US6918323Nov 1, 2002Jul 19, 2005Easco Hand Tools Inc.Reversible ratcheting tool with improved pawl
US6945141Apr 22, 2002Sep 20, 2005Bobby HuReversible ratchet type wrench
US6955104Jul 1, 2002Oct 18, 2005Bobby HuReversible ratcheting tool with a smaller head
US6971286Jul 22, 2003Dec 6, 2005Bobby HuRatcheting wrench with quick tightening/loosening functions and fine adjusting functions
US7017453Sep 3, 2002Mar 28, 2006Bobby HuReversible ratchet-type wrench
US7032478Jul 6, 2005Apr 25, 2006Bobby HuRatcheting wrench with quick tightening/loosening functions and fine adjusting functions
US7073412Oct 12, 2004Jul 11, 2006Easco Hand Tools, Inc.Method of forming a pawl pocket for a ratcheting tool and tool thereby formed
US7131353Feb 17, 2005Nov 7, 2006Easco Hand Tools, Inc.Reversible ratcheting tool with improved pawl
US7178429Dec 12, 2002Feb 20, 2007Yen-Wen LinEasy-to-assemble ratcheting tool
US7185566Feb 14, 2006Mar 6, 2007Easco Hand Tools, Inc.Reversible ratcheting tool with improved pawl
US7234372Aug 15, 2002Jun 26, 2007Bobby HuReversible ratcheting tool with a smaller head and improved driving torque
US7237460Aug 29, 2001Jul 3, 2007Bobby HuBiasing arrangement for a pawl of a reversible ratchet-type wrench
US7263919Sep 10, 2004Sep 4, 2007Easco Handtools, Inc.Ratcheting tool with vertically curved tooth arrangement
US20020023520 *Aug 29, 2001Feb 28, 2002Bobby HuBiasing arrangement for a pawl of a reversible ratchet-type wrench
US20030196522 *Apr 22, 2002Oct 23, 2003Bobby HuReversible ratchet type wrench
US20040016322 *Jul 17, 2003Jan 29, 2004Bobby HuReversible ratcheting tool with a smaller head and improved driving torque
US20040055422 *Dec 12, 2002Mar 25, 2004Yen-Wen LinEasy-to-assemble ratcheting tool
US20040055423 *Sep 25, 2003Mar 25, 2004Bobby HuReversible ratcheting tool with a smaller head and improved driving torque
US20040083860 *Nov 1, 2002May 6, 2004Arnold Robert L.Reversible ratcheting tool with improved pawl
US20040093995 *Jul 22, 2003May 20, 2004Bobby HuRatcheting wrench with quick tightening/loosening functions and fine adjusting functions
US20040139823 *Jan 5, 2004Jul 22, 2004Bobby HuBiasing arrangement for a pawl of a reversible ratchet-type wrench
US20050139041 *Feb 17, 2005Jun 30, 2005Easco Hand Tools, Inc.Reversible ratcheting tool with improved pawl
US20050229751 *Jul 6, 2005Oct 20, 2005Bobby HuRatcheting wrench with quick tightening/loosening functions and fine adjusting functions
US20060123954 *Sep 10, 2004Jun 15, 2006Arnold Robert LRatcheting tool with vertically curved tooth arrangement
US20060130614 *Oct 12, 2004Jun 22, 2006Easco Hand Tools, Inc.Method of forming a pawl pocket for a ratcheting tool and tool thereby formed
US20060130615 *Feb 14, 2006Jun 22, 2006Easco Hand Tools, Inc.Reversible ratcheting tool with improved pawl
USRE43286Nov 21, 2002Apr 3, 2012Bobby HuRatchet wheel with asymmetric arcuate concave teeth or non-arcuate concave teeth ratcheting tools with such ratchet wheel and combination of such ratchet wheel and a pawl
Classifications
U.S. Classification192/43.2, 74/578, 254/DIG.300
Cooperative ClassificationY10S254/03, B25B13/463