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 numberUS803783 A
Publication typeGrant
Publication dateNov 7, 1905
Filing dateMar 23, 1905
Priority dateMar 23, 1905
Publication numberUS 803783 A, US 803783A, US-A-803783, US803783 A, US803783A
InventorsFrank Pfeifer
Original AssigneeThomas g steele
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Step-ladder.
US 803783 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

PATENTED NOV. 7, 1905. F. PPEIFER & T. G. STEELE.

STEP LADDER. AAAAAAAAAAAAAAAAAAAAAAAAAA 5.

Fan/5f yer w flmjf 9 UNITED STATES PATENT ()FFICE.

FRANK PFEIFER AND THOMAS G. STEELE, OF CHIPPEWA FALLS, WISCONSIN; SAID PFEIFER ASSIGNOR TO SAID STEELE.

STEP-LADDER.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed March 23, 1905. Serial No. 251,551.

have invented certain new and useful Improve-' ments in Step-Ladders, of which the following is a specification.

Our invention relates to improvements in step-ladders; and one object is the provision of a step-ladder which. will be particularly desirable and convenient for use by paperhangers in that the ladder may be instantly adjusted to provide the platform or support at the exact height desired.

Another object of our invention is the provision of a step-ladder having an adjustable section or member and which ladder will be of the simplest, cheapest, and most durable construction and prove thoroughly efficient and practical in every particular.

In the drawing we have shown a perspective view of an adjustable step-ladder constructed in accordance with and embodying our invention, and we would state that when used by paper-hangers two of such ladders are usually employed to support the platform.

Our ladder comprises the rectangular open section or member A, to which is connected, by the pivoted links B, the support (I, said support being braced by the inclined crossbars D, and the parallel vertical bars of the member or section A are formed with a rack or series of teeth E, which are'engaged by the pair of pivoted dogs F, pivoted at Gr to the inner adjustable section or member H, provided with a series of steps J, and the step-section is connected to the rigid open section by means of the upper and lower pairs of bands or loops K, thus permitting the adjustable section to be moved with ease and adjusted at any desired height by means of the dog-and-rack connection. The pivoted dogs are provided with extensions F, which form handles to permit the pawls or dogs to be engaged or disengaged with the desired teeth of the rack.

It is evident that we provide a ladder which can be adjusted with ease to suit the requirements and which, while comparatively light in weight, will possess great strength and durability. It will also be noted that the pawls or dogs are concealed and protected between the movable and stationary sections of the ladder, and that only the handle portion is exposed, and that the general construction of our ladder insures a thoroughly practical and eflicient construction.

We claiml. A step-ladder consisting of an open rectangular section, a hinged prop or support for said section, a movable section fitted within the rectangular section and having a series of steps, and means for adjustably securing the movable section within the rectangular section.

2. A step-ladder, consisting of an open rectangular stationary section having a rack formed on its vertical bars, a sliding and adjustable step-ladder section fitting within the stationary section, and pivoted dogs carried by the sliding section to engagethe racks and secure said sliding section at the desired adjustment.

In testimony whereof we affix our signatures in presence of two witnesses.

FRANK PFEIFER. THOMAS Gr. STEELE.

Witnesses:

J. A. ANDERSON, MARY TALAND.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2684193 *Feb 26, 1952Jul 20, 1954Francis G MedleyStepladder
US6103458 *Jul 31, 1997Aug 15, 2000Fuji Photo Film Co., Ltd.Method for processing a silver halide color photographic light-sensitive material
US6880675 *Apr 25, 2003Apr 19, 2005Kuo-Ching HuangMultifunctional adjustable ladder assembly
US20030221910 *Apr 25, 2003Dec 4, 2003Kuo-Ching HuangMultifunctional adjustable ladder assembly
Classifications
Cooperative ClassificationE06C1/22