US3747706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable folding riser
Assignee: Wenger Corp
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Filing: 1971-11-18
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Granted: 1973-07-24
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Expires: 1991-11-18
Abstract
Abstract A portable folding riser for supporting a choir or the like including a pair of skeletal floor-engaging support frames disposed in spaced parallel upright positions, a plurality of ascending steps having opposite ends pivotally connected to the support frames for collapsing movement of the steps and frames about parallel front-to-rear axes to storage positions with the steps lying in a common plane and the frames lying in a common plane closely parallel to the steps, a brace extending between the support frames to prevent collapsing of the frames relative to the steps, and a plurality of casters on the backs of the support frames for movably supporting the riser on edge when collapsed. An additional tier may be optionally attached to the riser and includes a pair of collapsible frames supporting an additional step at a level above the highest step on the first recited frame. A safety rail is provided with the uppermost step.
Inventors
- 👤 D Paine
- 👤 H Urch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:01
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/12; E04H3/126
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
201 words
A folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced upright planes and each including an upright rear leg, an upright front leg, and a cross member rigidly connecting the legs, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. means pivotally connecting the steps to the frames for collapsing movement of the frames about axes parallel to the steps to positions parallel to the steps, d. a collapsible brace releasably connecting the support frames to prevent pivotal collapse of the support frames relative to the seats, e. an additional attachable riser tier including a pair of support frames, each having a rear floor-engaging leg and a front leg attachable to the top of the rear leg of one of the first recited support frames, and a step connected to the top of the last recited support frames at a level above the highest step on the first recited frames and f. means pivotally connecting the step of the attachable riser tier to the support frames therefor about axes parallel to the steps for collapse of the attachable riser tier frames with the first recited frames.
Claim 2
Dependent Claim
201 words
A folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced upright planes and each including an upright rear leg, an upright front leg, and a cross member rigidly connecting the legs, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. means pivotally connecting the steps to the frames for collapsing movement of the frames about axes parallel to the steps to positions parallel to the steps, d. a collapsible brace releasably connecting the support frames to prevent pivotal collapse of the support frames relative to the seats, e. an additional attachable riser tier including a pair of support frames, each having a rear floor-engaging leg and a front leg attachable to the top of the rear leg of one of the first recited support frames, and a step connected to the top of the last recited support frames at a level above the highest step on the first recited frames and f. means pivotally connecting the step of the attachable riser tier to the support frames therefor about axes parallel to the steps for collapse of the attachable riser tier frames with the first recited frames.
Claim 3
Dependent Claim
117 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transversE rail secured to the posts, means pivotally mounting one post on each supporting frame adjacent the uppermost step for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and a collar slidable on the post and engageable with the mounting bracket to latch the post in upright position.
Claim 4
Dependent Claim
117 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transversE rail secured to the posts, means pivotally mounting one post on each supporting frame adjacent the uppermost step for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and a collar slidable on the post and engageable with the mounting bracket to latch the post in upright position.
Claim 5
Dependent Claim
113 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transverse rail secured to the posts, a U-shaped mounting bracket on each supporting frame adjacent the uppermost step, means pivotally mounting one post on each bracket for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and means for latching each post in upright position.
Claim 6
Dependent Claim
113 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transverse rail secured to the posts, a U-shaped mounting bracket on each supporting frame adjacent the uppermost step, means pivotally mounting one post on each bracket for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and means for latching each post in upright position.
Claim 7
Dependent Claim
128 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transverse rail secured to the posts, a U-shaped mounting bracket on each supporting frame adjacent the uppermost step, means pivotally mounting one post on each bracket for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and a collar slidable on the post and engageable with the mounting bracket to latch the post in upright position and in folded position.
Claim 8
Dependent Claim
128 words
A riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. a brace connecting the support frames, and d. a collapsible guard behind the uppermost step including a pair of upright posts, a transverse rail secured to the posts, a U-shaped mounting bracket on each supporting frame adjacent the uppermost step, means pivotally mounting one post on each bracket for movement between an upright position relative to the uppermost step and a folded position parallel to the uppermost step, and a collar slidable on the post and engageable with the mounting bracket to latch the post in upright position and in folded position.
Claim 9
Dependent Claim
143 words
A folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced upright planes and each including an upright rear leg, an upright front leg, and a crossmember rigidly connecting the legs, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. means pivotally connecting the steps to the frames for collapse, d. a collapsible brace releasably connecting the support frames to prevent collapse of the support frames relative to the seats, e. a mounting bracket detachably mounted on the top of each rear leg, f. an upright post pivotally mounted on each mounting bracket for movement between an upright position and a folded position parallel to the uppermost step, g. a transverse guard rail secured to the posts, and h. means for latching each post in upright and folded positions.
Claim 10
Dependent Claim
143 words
A folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced upright planes and each including an upright rear leg, an upright front leg, and a crossmember rigidly connecting the legs, b. a plurality of steps having opposite ends supported on the frames at ascending levels from front to rear, c. means pivotally connecting the steps to the frames for collapse, d. a collapsible brace releasably connecting the support frames to prevent collapse of the support frames relative to the seats, e. a mounting bracket detachably mounted on the top of each rear leg, f. an upright post pivotally mounted on each mounting bracket for movement between an upright position and a folded position parallel to the uppermost step, g. a transverse guard rail secured to the posts, and h. means for latching each post in upright and folded positions.
Claim 11
Dependent Claim
154 words
A portable folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of horizontal supports on each support frame at increasing heights from front to rear, c. a plurality of ascending steps having opposite ends pivotally connected to the supports for collapsing movement of the steps and frames about parallel front-to-rear axes to positions with the steps lying in a common plane and the frames lying in a common plane closely parallel to the steps, d. a brace releasably holding the support frames in upright positions, e. a mounting bracket pivotally mounted on each support frame adjacent the uppermost step for relative movement about a front-to-rear axis, f. an upright post pivotally mounted on each mounting bracket about a transverse axis for movement from an upright position to folded position parallel to the uppermost step, and g. a transverse guard rail secured to each post.
Claim 12
Dependent Claim
154 words
A portable folding riser, comprising, a. a pair of floor-engaging support frames disposed in spaced parallel upright positions, b. a plurality of horizontal supports on each support frame at increasing heights from front to rear, c. a plurality of ascending steps having opposite ends pivotally connected to the supports for collapsing movement of the steps and frames about parallel front-to-rear axes to positions with the steps lying in a common plane and the frames lying in a common plane closely parallel to the steps, d. a brace releasably holding the support frames in upright positions, e. a mounting bracket pivotally mounted on each support frame adjacent the uppermost step for relative movement about a front-to-rear axis, f. an upright post pivotally mounted on each mounting bracket about a transverse axis for movement from an upright position to folded position parallel to the uppermost step, and g. a transverse guard rail secured to each post.
Claim 13
Dependent Claim
16 words
A riser as defined in claim 6, including means for latching the posts in upright positions.
Claim 14
Dependent Claim
16 words
A riser as defined in claim 6, including means for latching the posts in folded positions.
Claim 15
Dependent Claim
29 words
A riser as defined in claim 6, iNcluding a slidable collar on each post engageable with the adjacent mounting bracket for latching the post in upright and folded positions
Claim 16
Dependent Claim
45 words
A riser as defined in claim 9, wherein each mounting bracket is of forwardly-open U-shape and includes a forwardly-facing notch, and each collar includes a projection overlapping the mounting bracket when the post is upright and receivable in the notch when the post is folded.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |