US1397241A

US1397241A - Form-lifter

Info

Publication number: US1397241A
Application number: US409729A
Authority: US
Inventors: Linus M Convert
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-09-11
Filing date: 1920-09-11
Publication date: 1921-11-15
Anticipated expiration: 1938-11-15

Description

L. M. couvzm;

FORM LIFTER. APPLICATION FILED SEPT. 11, 1920- Patented Nov. 15, 1921.

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APPLICATION FILED SEPT. 11', 1920.

Patented Nov. 15, 1921.

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Nl'l'E STATES LIN US M. CONVERT, 0F PEORIA, ILLINOIS.

FORM-LIFTER.

Specification of Letters Patent.

Patented Nov. 15, 1921.

Application filed September 11, 1920. Serial No. 409,729.

To all whom it may concern:

forms, used in building construction, wherein the said lifter is adapted to be connected to the form, and has means for engaglng a supporting rod or pipe so arranged that the lifter carrying the form may be moved up the pipe, and will hold the form 1n adjusted position.

In the drawings:

Figure 1 is a front View of the lmproved lifter, a

Fig. 2 is a top plan view,

Fig. 3 is a section on the line 3 --3 of Fi 1 *igi is a vertical section,

Fig. 5 is a side view,

Fig. 6 is a section through one pair of T1 m aws o T i s a perspective view of the lower section of the lifter, v

Fig. 8 isa plan view of a pa r of aws,

Fig. 9 is a view of one of thGJLWS looking from the inner side. i i

In the present embodiment ofthe invention the improved lifter consists of means for engaging the form 1, and comprises a section 2 which is adaptedto be arranged on the upper side of the form,and a section 3 which is adapted to be arranged on the underside of the form, the said sections rigidly secured together by means of bolts and nuts 4, the bolts passlng through reg1stering openings in the sections and in the form.

Each of the sections 2 and 3 is in the form of a cylindrical body having an enlarged base which seats against the form, and the upper section 2' carries pans of oppositely extending ears 5, the members of the pairs being parallel and extendlng 1n the'opposite direction to the members of the other pair. 'A palr'of levers 6 and 7 respectively is pivoted to each pair of cars,

by means of pivotpins8, and referring to Fig. 2 it will be seen that those ears to which the levers 7 are pivoted are spaced farther apart than those ears to which the levers 6 are pivoted, the arrangement being such that the levers Twill lie outside of the levers 6. The free ends of each pair of levers are connected by a pivot pin 9 similar to the pins 8 before mentioned.

A gripping jaw 10 is supported by each pin 9, and each jaw 10 is shaped on its inner face to fitabout a rodor pipe 11, the rod orpipe passing through the sections 2 and 3 and through the form.,

The jaws 10 and the connected mechanism constitutes one gripping device, two of the said devices being-provided, and the other is supported fromthe section 3. The said other device comprises a frame 12 which is provided at each end with alined bearings 13 and 14., through which the pipe or rod 11 slides. This frame is supported from the section 3. by means of links 15. The

upper ends of the links are received in slots 16 extending longitudinally of the section 3, and are engaged by pivot pins 17, to pivotally connect the links to the section. The lower ends of the links 15 are pivoted to the arms of a yoke shaped lever 28. The arms ofthis lever are received in slots 18 in the upper end of the frame 12 and are engaged by pivot pins 19 to pivotally connect the lever to the frame. The frame carries at its lower end oppositely extending pairs of ears 20, arranged in the same mannor as the ears 5,, and to each pair of ears there is pivoted a pair of

levers

21 and 22 respectively, corresponding to the

levers

6 and 7 of Fig. 2, the levers 22 fitting outside of the levers 21 in the same manner as the levers 7 fit outside of the levers 6. The levers are pivoted to the ears by pivot pins 23, and a gripping jaw 24 is supported between the free ends of each pair of levers, on a pin 25. Cotter pins are arranged at the ends of the

pins

23 and 25 to hold them in proper position. The jaws 10 are pressed upward away from the section 2 by means of a coilspring 26 which is arranged between the jaw and the section 2, and a similar spring 27 is arranged between the jaws 24 and the bearing 14, for a similar purpose. These springs 26 and 27 act to tighten the aws, since it is obvious that when the free ends of the levers 6-7 or 2l22 are swung upward the jaws will be tightened on the rod or pipe, that is they will be moved toward each other.

The "lever 28 extends laterally from the pipe or rod 11, and it will be obvious that when the free end of the lever is swung upwardly the lower portion of the lifter will be lifted, that is it will be moved closer to the upper portion while when the outer end of the lever'is moved downwardly the portions will be moved away from each other.

Referring to Fig. 9 it will be seen that the gripping jaws are corrugated on their inner faces, the said jaws being concaved to fit the pipe 11, and the concave surfaces have the corrugations. These corrugations face upwardly and it will be evident that when either the section 2 or the frame 12 is moved upwardly, the engagement of the inclined faces of the corrugations with the pipe or rod 11, tendsto move the said jaws downwardly against the tension of the spring 26 or 27 as the case may be, that is to loosen the jaws, while the downward movement of the said jaws with respect to the rod or pipe tends to tighten the jaws.

The operation is as follows: When it is desired to lift the form, the handle or lever 28 is swung downwardly at its outer end. This movement of the lever tends to tighten the jaws 24E,clamping them more firmly on the pipe 11, while at the same time the movement lifts the upper portion of the lifter, namely the sections 23. After the lever has beenswung down at its outer end to the limit of its movement, the outer end is swung upward. This movement of the lever loosens the lower gripping mechanism, the weight of the form holding the upper mechanism in gripping condition. The weight of the form during the lifting of the same is always supported by one gripping mecha nism while the other is moving with respect to the form.

I claim:' 1. In a form litter, the combination wit the form and a supporting pipe for the form, of a lifter comprising a section adapted to be rigidly connected with the form above and below the same and having means above the form for engaging the pipe and controlled to release position by the lifting of the form with respect to the supporting pipe, and a section supported below the form by the first named section and having means for engaging the pipe controlled to release position by the lifting of the said section with respect to the supporting pipe, and means in connection with the last named section and with the supporting means for lengthening and shortening the connection between the sections for the purpose speci-' fied, said means comprising a lever pivoted to the last named section intermediate its ends, and links connecting the lever at one end with the first named section.

2. In a form lifter, the combination with the form and a supporting pipe for the form, of a lifter comprising a section adapted to be connected with the form and having means for engaging the pipe and controlled to release position by the lifting'of the form with respect to the supporting pipe, and a section supported by the first named section and having means for engaging the pipe controlled to release position by the lifting of the said section with respect to the supporting pipe, and means in connection with the last named section and with the supporting means for lengthening and shortening the connection between the sections for the purpose specified, the engaging means for the sections comprising oppositely ar rangedgripping jaws, a link connecting each jaw to the opposite side of the section, said links crossing, and a spring pressing the jaws away from the section, said jaws having downwardly facing teeth.

3. In a form lifter, the combination with the form and a supporting pipe for the form, of a lifter comprising a section adapted to be connected with the form and having means for engaging the pipe and controlled to release position by the lifting of the form with respect to the supporting pipe, and a section supported by the first named section and having means for engaging the pipe controlled to release position by the lifting of the said section with respect to the supporting pipe, and means in connection with the last named section and with the supporting means for lengthening and shortening the connection between the sections for the purpose specified, the engaging mechanism for each section comprising a pair of gripping jaws arranged above the sectionfor engaging opposite sides of the pipe, connections between the jaws and the sections for moving said jaws toward the pipe when the sections move downward with respect to the jaws, and a spring normally pressing the jaws away from the sections.

4;. In a form lifter, the combination with the form and asupporting pipefor the form, of a lifter comprising a section adapted to be connected with the form and having means for engaging the pipe and controlled to release position by the lifting of the form with respect to the supporting pipe, and a section supported by the first named section and having means for engaging the pipe controlled to releaseposition by the lifting of the said section with respect to the supporting pipe, and means in connection with the last named section and with the supportlng means for lengthening and shortening the connection between the sections for the purpose specified, the engaging means for l l r l l each section comprising a pair of jaws for engaging the pipe and connected to the section in such manner that the jaws are re leased and engaged by movement toward and from the sections, and means acting normally to move the jaws away from the sections.

5. In a form lifter, the combination with the form and a supporting pipe for the form, of a lifter comprising a section adapted to be connected with the form and having means for engaging the pipe and controlled to release position by the lifting of the form with respect to the supporting pipe, and a section supported by the first named section and having means for engaging the pipe controlled to release position by the lifting of the said section with respect to the supporting pipe, and means in connection with the last named section and with the supporting means for lengthening and shortening the connection between the sections for the purpose specified, the engaging means for each section comprising a pair of opposed jaws for engaging the pipe and connected to the section by oppositely extending and crossed levers, whereby the jaws are released and engaged by movement toward and from the sections.

6. A form lifter comprising a pair of sections, one of said sections having means for connection with a form, the other section having means for moving said other section toward and from the first named section, and a pair of opposed gripping jaws movably mounted on obliquely crossed levers in connection with each section controlled to release and engaging positions by movement toward and from the adjacent section.

LINUS M. CONVERT.