US1414683A - Electric lifting jack - Google Patents

Description

J. A. ANGLADA. ELECTRIC LiFTlNG JACK.

APPL|CAT|0N-FILED)UWM-.1919.

Patented May 2, 1922.

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ATTORNEY 3 SHEETS-SHEET 2.

ATTORNEY A. ANGLADA.

ELECTRIC LIFTING JACK.

APPLICATION FILED IuLY I4. I9I9.

Patented May 2, 1922.

FIGA 5 GI. F

J. A. ANGLADA.

ELECTRIC LIFTING JACK.

APPucATloN FILED 1uLY14. 1919.

FIG.

f llllllhlll l' \\i jilll /A/l/E/VTOR ATTORNEY Patented May 2, 1922.

rarslrr OFFICE. y

OF. JE1\`I'KIN TOWN, PENNSYLVANIA, ASSIGNOR 0F ONE-:HALF T0 CHARLES S. ACKLEY, OF NEW YORK, N. Y.

ELECTRIC LIFTIN'G- JACK.

Application mea July 14,

To all whom t may concern:

Be it known that I, JOSEPH A. ANGLADA, a citizen of the United States, and a resident of Jenkintown, county of Montgomery, and State of Pennsylvania, have invented certain new and useful Improvements in Electric Lifting Jacks, of which the following., together with the accompanying drawings, is a specification.

My invention relates to lifting jacks actuated by electric motors and more particularly to light portable jacks such as may be used for lifting automobiles, and its object is to provide a simple, inexpensive and elicient device of this character. lAnother object is to provide as a part of the device, a handle by means of which it may be positioned and its motor controlled. Another object is to providean arrangement for automatically stopping the motor when the lifting element of the jack reaches the' ends of its travel. l

These and other. objects of the invention will ap ear in the followingspecification in which Ii will describe the invention, the novel features of which will be set forth in appended claims. l

Referring 'to the drawings:

Figure l is a side elevation of a lifting jack which is made according to and embodies this invention with the positioning and control handle removed.

Figure 2 is a plan view of the same device.

' Figure 3 isa sectional end elevation of the form of jack shown in Figures 1 and 2, the section being tak'en on the line 3-3 of Figvre 2. A

Figure 4 is a side elevation of another form of construction which also embodies this invention.4 t

Figure '5- is a plan view of the device shown in Figure 4.

Figure 6 is a sectional end elevation of the jack of Figures 4 and 5, the section being taken on the line 6-6 of Figure 5.

Figure 7 is a sectional side elevation of the lower end of a positioning and control handle' together with its operating parts, Y

the section being taken on the line 7-7 of Figure 8.' l

Figure 8 isa plan view of the parts shown in Figure 7:

Figure 9 is a sectional end elevation of the lower end of anothery form of positioning Specification of Lettersrlatent.

Patented vMay 2, 1922. 1919. serial iro. 310,652.

and control handle and its cooperating parts.

.The section in this figure is taken on the line 9-9 of Figure 10.

Figure 10 is a plan view of the parts shown in Figure 9. Y y

Figure 11 isa sectional elevation 0n a larger scale of a part of the lifting screw and the parts which cooperate therewith to limit its movement.

Figure 12 is a wiring diagram showing a way in which the 'parts may be connected electrically.

Like characters of reference designate corresponding parts in all of the iigures of the drawings. v v

2O designates a base upon which the various parts Iare mounted. 21 is an outer casing secured to the base by a collar 22. Rotatively supported within the casing is a hollow driving member 23, the lower end of which rests upon an anti-friction 4bearing 24. The upper part of this member is constructed to form internal threads 25 through which passes the lifting screw 26. This screw is provided with a longitudinal groove 27 in which key 28 in the upper part of the casing 21 fits to prevent the rotation of the screw. 29 is a load engaging member at In either construction there are ears 40 projecting from the base at the'side thereof opposite the motor.l 41 is a pin through these .ears which in' the arrangementshown in Figures and 8 also passes through spool 42 through which is a hole the center of which is the same diameter as that of the pin, but which flares outwardly toward both ends. A threaded lug 43 lprojects from 4the spool, into which is screwed the end of the positioning and con-trol handle 44.

Between the ears 40 and the ends of the spool is a frame 45 of insulating material on which are mounted four4 movable contacts 46 and four cooperating stationary contacts 47. The handle may be used to position the jack, 4and maybe moved upy and down about the pin 41 without effecting the electrical connection, but when it is moved to .one side or the other as indicated by the arrows A and B in Figure 8, it will rock the spool-against one or the other pair of the movable contacts to'start the motor roi tating in one 'direction or the other in a way which will be fully described hereinafter.

Another arrangement for the positioning and-control lever 44 is shownvin Figures 9 and in which the pin 41 passes through a bracket 5() of insulating material on which are four stationary contacts 51. On the end of the handle 44 is a rocker 52'on which are themovable contacts 53. In this case the contacts are opened and closed by rotating .the handle 44 as indicated by the arrows C and D in Figure 9.

The lifting screw is hollow and within it is a fiat strip 6() which is twisted near its ends as at 61, 62. A washer-63 affixed to the lower end of the screw 26 has a slotin it through which the strip 60 passes. At the lower end of the strip is a spring 64 which connects it with a cam 65. This is arranged to be rotated between two pivoted spring pressed contacts 66, 67 which are adapted to engagea stationary contact 68.

Now by referring to the wiring diagram, I will describe the operation of this device. The handle 44 is pivoted to the baseA of the jack So that the jack may be pushed or pulled into desired position without being tipped over. Then the handle may be manipulated to actuate the contacts These are a-rran ed toclose the motor circuit as follows: -us assume that the jack 'is in its lowermost position and it is desired to raise it. The contacts shown at the right of Figure 12 'from battery 7() through a conductor 71,

through the motor armature 72, to and through contacts 73 and 74, vto and through the motor fields 75 and 76, to the stationary contact '68 of the automatic stop switch,

through'the pivoted, contact 67,c'ontacts 77 78 and conductor 79 back to the battery.

As soon as the screw has been lifted a little the washer 63 on the bottom of it will turn the strip and cam 65 to allow' pivoted contact 66 to close against stationary contact 6,8. This will have no eliect upon the circuits because the conductor which isfmove the screw downwardly and this moveetl are moved to be closed so that current passes.

matic stop switch contacts 66, 68 and that the current passes through the motor fields 76, 75 in the opposite direction to that which it did before. This will cause the motor. tov

70 ment will eventually cause the pivoted contact 66 to be moved olf from the stationary contact 68 to ston the motor at the end of the downward movement of the lifting` SI'OV.

It is of course to be understood that the contacts 73, 74, 77, 78 and 81-84 of the wiring diagram correspond with those designated by 46, 47 in Figures 7 and 8, and those designated by 51, 53 in Figures 9' and 10.

While I have described this invention as applied to light portable jacks, it is in no way limited to such use as the same principles are equally of the heaviest form. The 'modifications' illust-rated and described are merely illustrative, and .I do not intend tolimit myself to any specific form or mechanism, and in fact, I intend no limitations other than those imposed by'the appended claims.

Vhat I claim is:

1. A lifting jack comprising a pair of relativelymovable members, an electric m0- tor connected to impart such relative movement thereto, circuits for 'the motor andl a positioning handle lconnected with one of said members and, arranged to control the motor circuits.

2. A lifting jack comprising a pair of relatively movable members, an electric motor connected to impart such relative movement thereto, circuits for the motor and a positioning handle connected with one of said members and arranged to control the motor circuits, and a switch inthe motor circuits actuated by the relative movement of said members arranged to stop the motorautomatically at the ends of Said movement.

`3. A lifting jack comprising an outer casing a lifting screw, an electric motor'and intermediate mechanism between the motor and the screw for causing the rotation of the motor to move the screw longitudinally, circuits for the motor and a positioning'115 handle connected with-said outer casing and arranged to control the motor circuit.

'4. A lifting jack comprising an outer'casmg a lifting-screw, an 'electric motor and intermediate mechanism, comprising worm gearlng, .between the .motor and the Screw for causing t-he rotation of the motor to Amove the screw longitudinally, circuits for the motor, anda positioning handle pivotally connected with said outer casing 'near 125 the lower part thereof, and arranged to control the motor circuit. y

5. A lifting jack comprising an outer casing, a lifting screw, an electric motor and intermediate mechanism between the motor applicable to lifting jacks 85I and the screw for causing the rotation of the motor to move the Screw longitudinally, circuits for the motor, and al positioning handle connected with said outer casing arranged to control the motor circuits, and a switch in said motor circuits and means actuated by the longitudinal movement of the lifting screw for actuating the switch to stop the motor automatically at the ends of the movement of the screw.

6. A lifting jack comprising an outer caslng, axlifting screw, an electric motor and intermediate mechanism, comprising worm gearing, between the motor and the screw for 'causing the rotation of the motor to move the screw longitudinally, circuits for the motor, and a positioning `handle pivotally connected with said outer casing near the lower part thereof arranged to control the motorcircuits, and a switch within said casing and in saidmotor circuits and means actuated by screw for actuating the switch to stop the motor automaticallyat the ends of the movement ofthe screw.

7. A lifting jackcomprising an outer cas.- ing and a relatively movable member, a inotor rigidly mounted with the outer casing and arranged to impart said relative movement to said member, a positioning and control handle m/vably connected with the castor rigidly mounted with the outer casing and arranged to impart said relative movement to said member, aV positioning and control handle movably connected with the casing, means actuated by the movement of the handle relative to the casing for controlling the motor, and means actuated by the movement of said member relative to the casing arranged to stop the motor automatically at the ends of said movement. the longitudinal movement of the liftingA In Witness whereof, I have hereunto set my hand this 11th day of July, 1919.

JOSEPH A. ANGLADA.

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