US751309A - Lifting-jack - Google Patents

Description

Patented February 2, 1904.

PATENT OEEICE.

LEROY O. LANDER, OF LISABUELA, `W'ASHINGrTON.

-LlFTlNG-JACK.

SPECIFICATION forming -part of Letters Patent No. 751,309, dated February 2, 1904.

' Application filed July/.25, 1903. SerialNo.166 .968. (No model.)

To all whom it, may concern: l

Be it known that I, LEROY O. LANDER, a citizen of the United States, and a resident of Lisabuela, in the conntyof King and State of Washingtomhave invented anew and Improved Lifting-Jack, of which the following is a full, clear, and exact description.

This invention relates to lifting-jacks; and

4 it consists, substantially in certain parts, and

details and combinations of the same, hereinafter particularly described, and pointed out in' the claims. y

My improvements have referencemore especially to the type of lifting-jacks -of which the one shown and described in my former Letters Patent, No. 391,165, granted on the 16th day of October, 1886, is an example; and one of the principal objects of my present invention is to provide means for overcoming numerous disadvantages and objections found to eXist with manyjacks of this kind hitherto devised, and also to provide a jack which is simple in construction, strong and durable in use, not liable to get out of order, and which is also comparatively inexpensive to manufacture. I

'A further object of the invention is to provide a lifting-jack of the character referred to which is effective and reliable in use, as well as easily operated and controlled, besides possessing the capacity for long and repeated service. v

The above and additional objects are attained by means substantially such as are illustrated in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view of a liftingjack embodying my improvements. Fig. 2 is a vertical view thereof; and Fig. 3 is also a vertical sectional view in detail, showing the operation of the spring-actuated dog or detent for the lifting-bar.

1 of a pivoted operating-lever, the said liftingbar being automatically caught and retained in dierent vertical positionsl by means of a dog having special means for operating the same, and while I have herein represented my improvements in a certain preferred embodiment itwill. be understood, of course, that I am not'limited thereto in practice, since immaterial changes thereinmay be resorted to coming within the scope of'my invention.

Specific reference beinghad tothe accompanying drawings by the designating charac-l ters marked thereon, 1 represents ya stock having a base 2 and formed with avertical groove 3, between the sides of which vworks the lifting-bar 4, provided on its inner vertical face with a series of teeth or projections 5, as shown, and having at'its upper end a detachable head 6 and at its lower end an integral foot 7 designed to be placed beneath a log or other devi/ce to lbe lifted by the structure. Secured to the upper part of the stock by means of bolts 8 are the cheek-pieces 9 of' a guide 10 for the lifting-bar, said cheek-pieces being connected by an additional bolt '11, swinging on which within the Said cheek-pieces `are preferably duplicate links12, between the lower ends of which is .pivoted at 13 the inner end portion 14 of an operating-lever 15,

which may be socketed at 16 for the insertion of a handle, (not shown,) the said end portion of the lever terminating 'in a toe 15, adapted to the spaces between the said teeth 5, so as to engage the latter, as shown. i I have found it a decided advantage to thus organize the said connecting-links for .the lever, since the links are brought closer .,together, resulting in v'greater strength, besides rendering the same less liable to breakage or injury from Contact with external objects, as is apparent, and,

moreover, any tendency to spreading of said IOO flat spring steel spring 21, the lower end of which is secured to the front of the stock, it being noted that the member 17 is supported by and works between the edgesof straightsided slots 22, formed in the lower part of the said cheek-pieces of the guide 10. At the outer side of one (or both) or' said cheek-pieces is a pin or screw 23, passing' through a slot 24 in a hand-lever 25, having thumb-piece 26, the lower end or' said hand-lever being pivoted at 27 to an end of the slidable slide member 17, and thus it will be seen that by proper manipulation of this hand-lever the lifting-bar may be caused to be released from engagement with the teeth to enable lowering of the bar when desired.

The organization of the special form of aetuating-spring for the slide has the advantage of greater strength with less liability to aceidental operation thereoiI in use, which would cause a release of the lifting-bar, which is a I disadvantage in many former lifting-jacks of this class. The upper end of said spring works against the shoulder on the slide, and thus will the operation of my improvements be fully understood.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-a l. A lifting-jack comprising a stock having a guide, with slots therein, a lifting-bar working through the guide and provided with a series of teeth, an operating-lever for the bar having means for engaging said teeth, a slide working through the stock, having a shoulder near its outer end, said slide having a member movable in said slots and engaging said teeth to lock the bar, and a flat spring operating at one end against said shoulder and secured at its other end to said stock, said spring operating to hold said slide normally in engagement with the teeth.

2. A lifting-jack comprising a stock, having at its upper end an upwardly projecting guide, constructed with duplicate cheekpieces, having straight-sided slots therein, a lifting-bar working through the guide, the same having an integral foot, and provided on its inner face with a series of teeth, an operating-lever for the bar, `having means for engaging' said teeth, a slide working through the stock, and having a shoulder near its outer end, said slide having a member moving in said slots, and engaging said teeth to lock the bar, a fiat spring operating at one end. against said shoulder, and secured at its other end to the front of the stock, and a slotted hand-lever for moving said slide outwardly.

3. A lifting-jack comprising a stock, having at its upper part an upwardly projecting guide, Constructed with duplicate cheekpieees, having straight-sided slots therein, a lifting-bar working through the guide, the same having an integral foot, and provided on its inner face with a series of teeth, an op erating-lever forthe bar, having a toe for engaging the teeth, links pivoted within the cheek-pieces, and having movable connection with the lever, a slide working through the steek, and provided with a shoulder near its outer end, said slide having a member moving in said slots, and engaging said teeth to lock the bar, a flat spring operating at one end against said shoulder, and secured at its other end to the stock, and a slotted hand-lever mounted at the side of one of the cheekpieces, for disengaging the slide from said teeth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing 'witn esses.

' LEROY O. LANDER.

Witnesses:

JOHN TODD, WVM. O. DILLEY.

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