US1717756A

US1717756A - Heat guard

Info

Publication number: US1717756A
Application number: US281513A
Authority: US
Inventors: Charles T Brady
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-05-29
Filing date: 1928-05-29
Publication date: 1929-06-18
Anticipated expiration: 1946-06-18

Description

C. T. BRADY June 18, 1929.

HEAT GUARD Filed May 29, 1928 2 heets-Sheet June 18, l929. -c T BRADY 1,717,756

HEAT GUARD Filed May 29, 1928 2 Sheets-Sheet 2 {I Home o Patented June 18, 1929.

unrrsn STATES CHAR-LES T. BRADY, 013 DETROIT, MICHIGAN.

HEAT GUARD.

Application filed May 2%}, 1928. Serial No. 281,513.

The present invention pertains to a novel heat guard constructed particularly for application to a housing of a projector light. A housing of this character becomes very hot when the lamp therein is illuminated, and the object of the present invention is to provide a device to prevent the hands of the operator or other persons from coming in direct contact with this housing.

The guard is constructed and supported around the lamp housing in such a manner as to receive a minimum quantity of heat from the latter and to permit radiation of the major portion of heat to the air. in order to fulfil these functions, the metallic surface of the device is rendered comparatively small by constructing the guard in the form of a wire cage. Further, the cage supported spacedly around the lamp housing and is held in such position by grip members bearing on the housing and having only a single point contact with the cage, as a result of which the direct conduction of heat from the housing to the cage is very small.

'The invention is fully disclosed by way of example in the following description and in the accompanying drawing, in which- Figure 1 is a side elevation of the device;

Fig. 2 is a rear end View;

Fig. 3 is a longitudinal section, downwardly; and

Fig. 1 is a front end view.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

The projector unit to which the guard is applied includes an upright 1 supported in vertical position in any suitable manner and having a lamp socket 2 at its upper end. A ring 3 is fitted around the upright, beneath the socket, and has a pair of arms 4: extending upwardly thereof in spaced relation to the socket as shown more clearly in Figure 1. A lamp, (not shown) is inserted inthe socket and surrounded by a housing 5 resting on the upper ends of the arms 4. Since the housing does not depend on the socket for its support, the aperture in the base of the housing for accommodating the lamp may be of greater diameter than the surrounded part of the socket so that the apertured wall need not engage the socket. This arrangement reduces transmission of heat from the housing to the socket.

The guard applied over the housing is in the t rm or wire ease f similar looking tional configuration to that of the housing but of larger area.

The front and rear ends of the cage consist of wire frame members 6 and 7 respectively having the configuration previously mentioned, while certain sides 8 of the rear frame may be bent inwardly as shown in Figure 3. At the bottom of the cage, the front rame 6 has an open'side 9, and the cage structure is completed by spaced parallcl wires 10 joining the end frames 6 and 7 for forming the lateral walls of the cage.

A yoke 11 is mounted in the slot 9 and has its open side exposed to the mouth of the slot while its ends 12 are secured to the wires 10 defining the edges of the slot. A number of lingers 13 depend from the yoke and have their lower ends bent inwardly as at lat and secured to another yoke 15 somewhat similar to but smaller than the member 11. The yoke 15 supports a clip 16 adapted for attachment to the upright support 1, whereby the members 10-15 form a cage surrounding the socket and spaced therefrom. The back of the yoke is supported by short strands 17 extending therefrom to the end member 7 in parallel relation to the wires 10.

At points spaced peripherally around the main wire cage, fingers 18 are secured to certain of the wires 10 and set to extend somewhat inwardly as well as peripherally of the cage as may be seen by reference to Figure 2. The fingers are in fact wire members similar to the members 10 and are prolonged or extended to form grip members. The grip members, continuing from the peripherally extending fingers 18 include each a branch 19 lying longitudinally of the cage and disposed forwardly of the correspond ing finger 18, a coil 20, and a return branch 21. The free or rear ends of the branches 21 support an inner frame 22 spaced from the rear frame 7 and from the surrounding wire 10.

The device is applied to a lamp housing by merely being slipped over the same so that the socket lies in the slot 9 and lower cage 11-15 and the clip 16 engages the support 1 as already stated. The gripping members 18 21 go into engagement with the outer wall of the housing, and maintain the cage spaced from the housing because of their positions within the cage. Heat is conducted. from the housing direetl to the wi e tnnt'iure enly at the points there the grip members engage the housing. From these points this heat is conducted only to the several Wires to which attached. Otherwise, the cage receives no heat by direct conduction for it will be seen that the inner frame 22 supported by the branches 21 has no other connection to the cage proper. The direct contact between the lamp housing and the cage structure is thus reduced to a very small area so that the major portion of the heat is permitted to be taken up by the atmosphere rather than by the protecting cage. In keeping with this object of holding the gripping members out of contact with the cage except where es sential, the wires 10 directly adjacent the gripping members are bowed outwardly as at 23 as shown more clearly in Figures 2 and 4. v 7

Although a specific embodiment of the invention has been illustrated and described, it will be understood tl'iat various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

'What I claim is:

1. A heat guard comprising a wire cage, grip members having each a single point attachment to said cage and extending inwardly therefrom, a frame inside said cage and spaced therefrom, said frame being connected to and supported by said fingers.

2. A heat guard comprising a wire cage, fingers inside said cage and having each a single point attachment thereto, grip members carried by said fingers, said members being spaced inwardly from said cage and extending longitudinally thereof, and a frame inside said cage and spaced there from, said frame being supported by said members.

3. A heat guard comprising a wire cage, fingers inside said cage and having each a single point attachment thereto, grip members carried by said fingers, said members being spaced inwardly from said cage and extending longitudinally thereof, a frame inside said cage and spaced therefrom, said the fingers 18 are frame being supported by said members, and a socket cage depending from said first named cage and adapted to be spaced around a socket received therein.

4. A heat guard comprising a wire cage, grip members having each a single point attachment to said cage and extending inwardly therefrom, a socket cage depending from said first named cage and adapted to be spaced around a socket received therein, and a clip carried by said socket cage.

5. A heat guard comprising a wire cage, lingers inside said cage and having each a single point attachmentthereto, grip members carried by said fingers, said members being spaced inwardly from said cage and extending longitudinally thereof, a frame inside said cage and spaced therefrom, said frame being supported by said members, a socket cage depending from said first named cage and adapted to be spaced around a socket received therein, and a clip carried by said socket cage.

6. A heat guard comprising a wire cage, fingers inside said cage and having each a single point attachment thereto, grip members carried by said fingers, said members being spaced inwardly from said cage and extending longitudinally thereof, and a frame inside said cage and spaced therefrom, said frame being supported by said members and said cage having a slot in its bottom adapted to loosely receive a socket.

7. A heat guard comprising a wire cage, fingers inside said cage and having each a single point attachment thereto, grip members carried by said fingers, said members being spaced inwardly from said cage and extending longitudinally thereof, a frame inside said cage and spaced therefrom, said frame being supported by said members and said cage having a slot in its bottom adapted to loosely receive a socket, and a socket cage depending from said first named cage at said slot and adapted to be spaced around a socketreceived therein.

In testimony whereof I affix my signature.

CHARLES T. BRADY.