US3152787A

US3152787A - Floor jack

Info

Publication number: US3152787A
Application number: US318976A
Authority: US
Inventors: Timmons Albert S Nelson
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-10-25
Filing date: 1963-10-25
Publication date: 1964-10-13
Anticipated expiration: 1981-10-13

Description

Oct. 13, 1964 A. s. N. 'rlMMoNs FLOOR JACK s n 1 m N m u a 0 m w M m W u 2 N. Q A K vw k Q if \m w N\ m.\. mm ww www a m h w# mm. Nvo o@ I j@ NM. Q. .Nh \.m%% WXQ wm.\\. k.; uw mk. b mmv QR w MN d .mm\\ m N ON\ NN\ Nw m N. Fm .N

This invention relates to a machine or apparatus for use in laying `iloors and which` is adapted to be utilized for pulling iloorboards together into abutting engage- Vrnent and forl holding the boards immovable while the boards are nailed or otherwise anchored to the supporting frame. Y f y More particularly, it is an object of the present in- 1 vention to provide a portable electrically driven machine for the aforedescribed purpose includingy a wheeled frame' to facilitate movement of the machine and which additionally functions as' an abutmentv when the machine is in operation.

Another object of the invention is to provide a machine `or apparatus whichrmay be quickly engaged with and disengaged from a joist of a oor frame and a board of a lloor` disposed on said frame to materially reduce the labor involved in laying door.

i Various other objects and advantages of the invention will hereinafter become more fullyV apparent from the followingV description of the drawings, illustrating a presently preferred embodiment thereof, and wherein:

FIGURE 1 isla side elevational view, partly broken away, showing the oor jack in an operative position;

FIGURE 2 is an'e'nlarged cross sectional view ofthe .floor jack, taken substantially along a plane as indicated by the line 2-2 of FIGURE 1;

FIGURE 3 is an enlarged fragmentary substantially central longitudinal sectional view of .a part of the floor jack;

yFIGURE 4 is a fragmentary top plan view, partly in section, of another part thereof;

FIGURE 5 is a bottom plan view of one elementv of the floor jack, and

FIGURE 6 is a side elevational view of said element.

`Referring more specifically to the drawings, the iloor jack in its entirety and comprising the invention is designated generally 8 and includes a wheeled carriage, designated generally 9, having a frame 1.0 formed of a rigid lpiece of angle iron including a substantially horizontal top portion 11 and a depending, substantially vertical,

front side or wall 12.` Arms 13 are secured, as by welding, as seen at 14, in FIGURE 1, to end portions ofthe front wall 12. The arms 13 extend downwardly Vand loutwardly from ythe frame it), in a direction away from its top portion 11, and have outturned substantially aligned lower ends 15 forming axles 'on each of which is journaled a wheel 15.

A` sleeve member 16 is supported on and disposed cross-wise of the intermediate portion of the top wall 11, and an electric control box 17 has an intermediate 21. A reduction gear unit 22 is mounted onV the frontV 3,152,787 Patented Get. 13, 1964 ice ward end 25 which is disposed forwardly of the frame lll. A Lcollar 26 has a central bore Z7, one end of which is enlarged and internally threaded, as seen at 28, to engage on the threaded sleeve portion 25. The collar 26 includes an annular liange V2,9 having a threaded pe? riphery 30.

A long feed screw 31 extends through the bore 32 of the sleeve 16 and through thebore 27. A nut 33 threadedly engages the screw-31, forwardly of the collar 26 and has a forward end engaging nonrotatively in a central opening 34 of a large sprocket wheel 35, to which said nut is secured7 as by welding, as seen at 36 in FIG- URE 3. The sprocket wheel 36 is disposed directly beneath the sprocket wheel 24.

The nut 33 has an annular flange 37 at its rear end which ts rotatively in a cap member 38 having a front wall 39 which is provided with a large central opening il in which a part of the nut 33 turnably lits. The cap 3S has an annular rearwardly extending ilange l1` which is disposed around and spaced from the flange 37, and which has an internally threaded rear end 42 which threadedly engages the threaded periphery 39 for securing the cap 38 to the collar 26. As seen in FIGURE l, setscrews L13 extend inwardly through the flange 41 and against the threaded periphery 3i) for locking the cap 38 to the collar 26. A thrust bearing 44 is disposed within the cap 33 around the screw 31 and between the flanges 29 and 37. An endless chain 45 is trained around the

sprocket wheels

24 and 35.

A stop or abutment d6 is secured by a fastening 47 to the forward end of the screw 31. The screw 31 has a restricted stem 48 projecting from its rear end, as best seen in FIGURE 4, which extends transversely throughV the intermediate portion of elongated stabilizingbar 49, which is immovably secured to said stem as by welding, as seen at Sil. A clevis 51 is attached to the stem 48 beyond the bar 49 for attaching one end of a chain 52 to the screw 31. Y,

A stay iron or anchor 53 is connected to the opposite end of the chain 52 and includes a plate S4 having depending curved spikes or cleats 55 and an upwardly extending inclined handle S6. The rear end of the chain 52 is attached by a clevis 57 to an apertured web 5S of the stay iron 53.

An electric cord 59 leads from the control box'17 to the motor 20 and is connected to an electric plug Gil which protrudes from said control box and which is adapted to be connected to a conventional electrical extension cord, not shown. An electric switch 61 which is mounted in and protrudes from the control box 17 is interposed in the electric cord 59 for stopping, starting and reversing s the electric motor Ztl.

A chain guard 62 may be disposed -over the sprocketwheel 24 and the upper part of the chain 45 and sup-V ported by braces 63 from the casing of the motor 2li.

A part of a joist 64 and a part of a stud 65 is illus- Vtrated and constitutes a part of la oor frame on which a number of boards 66 are shown supported. The boards .'66 may constitute a part of a subflooring, to illustrate one of the motor 2l) and has a forwardly extending output shaft 23 which is driven at arreducedrspeed from the motor and to which is secured asmall sprocket wheel -The sleeve or tube `16 has an externally threaded'forapplication and use of the lloor jack 8. The top portion 11 of the frame 1) is positioned on one of the boards 66 which partially rests on the joist 64 and the front side 12 abuts a forward edge of said board 66 and an outer side of the joist 64, as seen in FIGURES 1 and 3. The anchor or stay iron 53 is forced Vdownwardly to cause the spikes 55 to beembedded in one of the boards 66 which is log cated remote from thejoist 64. Assuming that the plug switch 61is swung in one direction from its intermediate off position as illustrated in FIGURE 2 for completing an electric circuit to the motor 20fordriving the sprocket 1 ,9 wheel 24, chain 45, and sprocket wheel 35 in a direction so that the nut 33, turning with the sprocket wheel 35, will feed the screw 31 from right to left therethrough, as seen in FIGURES 1 and 3. The stabilizer bar 49 is disposed in sutiiciently close proximity to the ooring 66 to prevent rotation of the screw 31 and to insure feeding of the screw through the nut 33. The thrust bearing 44 absorbs the thrust of the nut 33 toward the collar 26 during this movement of the screw. As the screw is slowly.

advanced from right to left the chain 52 is initially tensioned, after which the screw and chain exert a pull on the stay iron or anchor S3 for drawing the boards 66 located between the joist 64 and the board to which said anchor is secured, toward one another and into tight abutting engagement. When this is accomplished, the switch 61 is returned to an off position to de-energize the motor 20, and while the boards 66 are thus held tightly together said boards are secured to the framing 64, 65. The switch 61 is then swung in the other direction for causing the motor to be driven in other direction for feeding the screw 31 in the opposite direction or from left to right of FGURES 1 and 3 through the nut 33 until slack is produced in the chain 52. A downward pressure can then be exerted on the handle 56 for rocking the stay iron 53 counterclockwise, as seen in FIGURES 1 and 6, for disengaging the spikes 55 from the flooring 66.

The bar 49 also functions as a handle for propelling lthe jack S from one location to another on the wheels 15 after disengagement of the frame from the joist 64.

Various modifications and changes are contemplated and may obviously be resorted to, without departing from the function or scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

l. A door jack comprising a frame member including a top portion and a depending front wall, a reversible electric motor supported above and secured to said top portion, means secured to said frame and disposed cross? wise thereof, a nut swivelly supported by said means forwardly of the frame, a feed screw extending threadedly through said nut and supported thereby crosswise of the frame with a part of said feed screw extending between the frame and electric motor, a stay iron connected to one end of `said screw and having depending spikes adapted to be anchored in a ooring board, and means including a sprocket wheeland chain drive forming a driving connection between the electric motor and said nut for revolving the nut in one direction when Ythe motor is energized for feeding said screw through the nut in a direction for pulling the stayiron toward said frame.

2. A door jack asv in claim 1, a stabilizing bar rigidly secured to and disposed crosswise of said screw end to prevent rotation of the screw with said nut.

3. A floor jack as in claim 2, a pair of transversely spaced wheels, means connecting said Wheels to the frame and combining therewith to form a carriage, and said stabilizing bar constituting a handle for propelling the jack on said wheeled carriage.

4. A floor jack as in claim 1,v said rst mentioned means comprising a sleeve supported on and disposed crosswise of the frame, a collar detachably secured to a forward end of said sleeve, a cap detachably secured to said collar, said Vnut having a part rotatively conned in said cap.

References Cited in the tile of this patent UNITED STATES PATENTS 269,519 Gandy Dec. 26, 1882 286,981 Williams Oct. 16, 1883 1,624,090 Blaine et al Apr. 12, 1927 3,105,675 Blackburn Oct. 1, 1963 v FOREIGN PATENTS 159,097 Germany Mar. 1, 1933 709,219 Germany Aug. 9, 1941

Claims

1. A FLOOR JACK COMPRISING A FRAME MEMBER INCLUDING A TOP PORTION AND A DEPENDING FRONT WALL, A REVERSIBLE ELECTRIC MOTOR SUPPORTED ABOVE AND SECURED TO SAID TOP PORTION, MEANS SECURED TO SAID FRAME AND DISPOSED CROSSWISE THEREOF, A NUT SWIVELLY SUPPORTED BY SAID MEANS FORWARDLY OF THE FRAME, A FEED SCREW EXTENDING THREADEDLY THROUGH SAID NUT AND SUPPORTED THEREBY CROSSWISE OF THE FRAME WITH A PART OF SAID FEED SCREW EXTENDING BETWEEN THE FRAME AND ELECTRIC MOTOR, A STAY IRON CONNECTED TO ONE END OF SAID SCREW AND HAVING DEPENDING SPIKES ADAPTED TO BE ANCHORED IN A FLOORING BOARD, AND MEANS INCLUDING A SPROCKET WHEEL AND CHAIN DRIVE FORMING A DRIVING CONNECTION BETWEEN THE ELECTRIC MOTOR AND SAID NUT FOR REVOLVING THE NUT IN ONE DIRECTION WHEN THE MOTOR IS ENERGIZED FOR FEEDING SAID SCREW THROUGH THE NUT IN A DIRECTION FOR PULLING THE STAY IRON TOWARD SAID FRAME.