US 1036098 A
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Description (OCR text may contain errors)
C. B. HARKNESS.
` APPLIQATION FILED Nov. 29, 1910.
1,036,098. v Patented Aug.2o,;912. ol f Uri* CHARLES B. HARKNESS, OF CAMBRIDGE, MASSACHUSETTS.
Specicaton of Letters Patent.
Patented Aug. 20, 1912.
Application led November 29, 1910. Serial No. 594,669.
To all whom t may concern Be it known that I, CHARLES B. HARK Nnss, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Door-Checks, of which the following is a speciiication.
This invention has for its object to pr0- vide certain improvements in door checks such as the one illustrated invUnited States Letters Patent No. 628,795, granted tome on the 11th day of July, 1899, in ,consequence of which each check may have a wider field of use and be rendered more e'flicient and the cost of manufactureymay be materially reduced; and thel invention con-A sists in certain features of construction and arrangement which I haveill'ustrated upon the drawing and which I shall now 4proceed to describeand. claim. j j
Referring to said drawing- Figure 1 illustrates in perspective embodying my improvements. Fig. 2 is a side elevation of said check. Figs.' 3 and 4 are sectional views showing the plunger in raised andv depressed positions respectively. Fig. 5 is a front elevation with the base and cylinder or box shown in section.- Figs. 6 and 7 illustrate the construction of theV plunger. 8 illustrates the, armor bracket detached from the plunger.
Referring to the drawing, the check is provided with a metallic base a. which is formed with a down-turned rim a to receive a shoe o of yielding or frictional material such as rubber, the under surface of which is preferably corrugated. 'The shoe may be secured in place by suitable fasten-l indicated at b b, the latter being in the form of an eyelet, so that a screw or nail may be passed through it into the iioor should the user find it desirable. The base is formed of sheet metal stamped and bent or drawn into shape. On the upper face of the base there is a shell-like cylinder or box c which is made of sheet metal drawn to shape, said box havingV at its lower end attaching ears c c through which rivets c3 or other fastenings are passed to secure it to said base. At its up per end, there is an inturned annular rim 2. The plunger 1s indicated at d, and it likewise is made of thin drawn sheet metal. Its upper end CZ is closed, and at its lower end it has an out-turned or lateral iiange cl2. The iiange is approximately circular and calspring e, the
View a door checkA fits accurately in the bore of the cylinder, while the peripheral wall of the plunger has an accurateiit in the circular aperture formed by the cylindrical rim 02, and consequently the sliding movement of the plunger is controlled at points increasingly remote as the plunger is depressed, and the plunger is prevented from being angularly deflected. Within the telescoping plunger and cylinder, there is placed a strong helilower convolution of which encircles a project-ion a3 lformed on the base,
`which prevents a lateralvdislocation of the spring, the upper end of the spring tting fairly accurately in the plunger. W'ith this construction, the spring extends throughout the lengt-h of the telescoping parts, is a lmaterial advantage in point of construction and operation. The rim Z2 has a finger or projection d3 which projects through a longitudinal slot o4 in the side 4wall of they cylinder to limit the upward movement ofthe plunger.
j To the plunger is attached an arm or bracket c' which consists of a stamping of the form shown in Fig. 8. It has an annular inner end portion e,a substantially circular outer endportion e2, and an intermediate or connecting'port-ion e3, which is bent so that the endo2 lies in aplane parallel toI but below the plane of the end e, the reason for which will be subsequently explained. The bracket has at itsedge an upturncd rim e* for Istifening-purposes andalso to form a socket in the outer end for the reception of a shoe f of ioning or frictional material, the latte-r beingl held in place by a suitable fastening as indicated at f. The bracket and the plunger are assembled and secured together by which corrugated rubber or other cushpassing the plunger through the aperture e5 ,in the inner end of the bracket until the annular end rest-s flatly against the rim or flangedg. Spring tongues are cut in the side walls of the plunger and are bent outwardly, so that, when the plunger and bracket are assembled, the ends of said tongues spring outwardly and their ends engage the bracket and lock it Armly against the flange cl2. The projection cl* extends part way under the intermediate portion of the bracket, and forms a support therefor. Said spring tongues are located in line with the projections Z3 cli, and, as a result of the construction described, the bracket and the plunger are rigidly secured together to prevent any relative movement. The intermediate portion of the bracket passes through a slot c5 in the side wall of the cylinder opposite thatat c4, and the slots are of such length that the projection Z3 engages the upper end of its slot as the bracket engages the upper end of slot c5 to maintain the bracket in horizontal posit-ion.
In actual practice, the space between the lower edge of a door and the ioor therebelow varies greatly, according to the manner in which the door is hung, and consequently, in order that the bracket and the base therebelow may be projected in t-he narrowest spaces, as where the door frame has no threshold, I provide for the bracket being depressed into the plane of the base. This is accomplished by forming the base with a socket or aperture a to receive the outer portion e2 of the bracket, so that, when the plunger is depressed, the bracket may be flush with the base as shown in Fig. 4l. In practice, the check is placed on the floor with its bracket extending in the proper direction, and then, by the foot, the operator depresses the plunger and swings the lower edge of the door over the bracket, after which he raises his foot and the spring forces the bracket upward so as to engage the lower edge of the door and hold it against movement.
Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of' its use, what I claim is l. A door check comprising a base, a cylinder secured to said base and having at its upper end an intiirned annular flange, said cylinder being also provided with oppositely disposed guide slots, a plunger guided by said annular flange and also provided wit-h a base flange having a projection entering one of said slots, and a door engaging bracket seated on the base flange and having a portion projected into the other slot, and means for holding the bracket to the base flange.
2. A door check comprising a base, a slotted shell-like cylinder secured to said base, and having at its upper end an inturned annular flange, a hollow plunger fitting in said annular flange and having at its lower end a flange engaging the side wall of said cylinder, a bracket extending through the slot in said cylinder and attached to said plunger, and a spring inclosed by said plunger and cylinder.
A3. In a door check of the character described, a base, a cylinder, a sheet metal plunger slidable in said cylinder and having at its inner end a lateral projection and tongues, and a bracket having an annular inner end encircling the plunger and locked between said projection and said tongues.
l. A door check comprising a base, a slotted cylinder, a spring-tensioned plunger, anda bracket attached to the plunger and extending through the slot in the cylinder,
the said base having a socket to receive said said bracket may be depressed to lie substantially flush with the said base.
6. A door check comprising a base, a casingcarried thereby and provided with longitudinally extending guide slots, a plunger movable longitudinally of said casing, means for opposing movement of said plun- .ger in one direction, a projection carried by l'said plunger for engaging one of said slots,
a bracket carried by the plunger and projecting through the other slot, said bracket projection and slots limiting and confining the plunger to longitudinal movementrelative to the casing, and spring tongues carand said base having a socket into which ried by the plunger for locking the bracket against movement relative to said plunger. In testimony whereof I have affixed my signature in presence of two witnesses.
CHARLES B. HARKNESS.
MARCUS B. MAY, P. W. PEZZETI.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,
Washington, D. C.